Version 3.0.0

Needed to bug-fix a problem with the menubar on Mac - post-3.0 I will
change the behaviour of SGBinding's destructor to avoid the property
copies in other use-cases.

.gitignore

@@ -1,4 +1,5 @@
 .*
+*~
 Makefile
 *.o
 lib*.a

3rdparty/CMakeLists.txt

@@ -0,0 +1,4 @@
+if (NOT SYSTEM_EXPAT)
+	add_subdirectory(expat)
+endif()
+

3rdparty/expat/CMakeLists.txt

@@ -0,0 +1,33 @@
+
+configure_file (
+    "${PROJECT_SOURCE_DIR}/3rdparty/expat/expat_config_cmake.in"
+    "${PROJECT_BINARY_DIR}/3rdparty/expat/expat_config.h"
+)
+
+set(expat_sources 
+	asciitab.h
+        hashtable.h
+        iasciitab.h
+        latin1tab.h
+        nametab.h
+        utf8tab.h
+        xmldef.h
+        xmlparse.h
+        xmlrole.h
+        xmltok.h
+        xmltok_impl.h
+        hashtable.c
+        xmlparse.c
+        xmlrole.c
+        xmltok.c
+        internal.h
+        ascii.h
+        sg_expat.h
+        sg_expat_external.h 
+	)
+
+foreach(s ${expat_sources})
+	set_property(GLOBAL
+		APPEND PROPERTY LOCAL_EXPAT_SOURCES 
+        "${CMAKE_CURRENT_SOURCE_DIR}/${s}")
+endforeach()

3rdparty/expat/sg_expat.h

@@ -15,7 +15,7 @@
 #endif
 
 #include <stdlib.h>
-#include "expat_external.h"
+#include "sg_expat_external.h"
 
 #ifdef __cplusplus
 extern "C" {

3rdparty/expat/xmlparse.c

@@ -23,7 +23,7 @@
 #endif /* ndef COMPILED_FROM_DSP */
 
 #include "ascii.h"
-#include "expat.h"
+#include "sg_expat.h"
 
 #ifdef XML_UNICODE
 #define XML_ENCODE_MAX XML_UTF16_ENCODE_MAX

3rdparty/expat/xmlrole.c

@@ -18,7 +18,7 @@
 #endif
 #endif /* ndef COMPILED_FROM_DSP */
 
-#include "expat_external.h"
+#include "sg_expat_external.h"
 #include "internal.h"
 #include "xmlrole.h"
 #include "ascii.h"

3rdparty/expat/xmltok.c

@@ -18,7 +18,7 @@
 #endif
 #endif /* ndef COMPILED_FROM_DSP */
 
-#include "expat_external.h"
+#include "sg_expat_external.h"
 #include "internal.h"
 #include "xmltok.h"
 #include "nametab.h"

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required (VERSION 2.6.4)
 include (CheckFunctionExists)
 include (CheckIncludeFile)
 include (CheckCXXSourceCompiles)
-
+include (CheckCXXCompilerFlag)
 
 project(SimGear)
 
@@ -10,6 +10,8 @@ project(SimGear)
 file(READ version versionFile)
 string(STRIP ${versionFile} SIMGEAR_VERSION)
 
+set(FIND_LIBRARY_USE_LIB64_PATHS ON)
+
 # use simgear version also as the SO version (if building SOs)
 SET(SIMGEAR_SOVERSION ${SIMGEAR_VERSION})
 
@@ -85,13 +87,6 @@ if(NOT "${CMAKE_LIBRARY_ARCHITECTURE}" STREQUAL "")
     message(STATUS "additional library directories: ${ADDITIONAL_LIBRARY_PATHS}")
 endif()
 
-if(NOT MSVC)
-    # TBD: are these really necessary? Aren't they considered by cmake automatically?
-    list(APPEND ADDITIONAL_LIBRARY_PATHS
-         /opt/local
-         /usr/local
-         /usr)
-endif()
 #####################################################################################
 
 if (NOT MSVC)
@@ -106,13 +101,13 @@ endif()
 
 option(SIMGEAR_HEADLESS "Set to ON to build SimGear without GUI/graphics support" OFF)
 option(JPEG_FACTORY     "Enable JPEG-factory support" OFF)
-option(ENABLE_LIBSVN    "Set to ON to build SimGear with libsvnclient support" ON)
 option(ENABLE_RTI       "Set to ON to build SimGear with RTI support" OFF)
 option(ENABLE_TESTS     "Set to OFF to disable building SimGear's test applications" ON)
 option(ENABLE_SOUND     "Set to OFF to disable building SimGear's sound support" ON)
+option(ENABLE_PKGUTIL   "Set to ON to build the sg_pkgutil application (default)" ON)
 
 if (MSVC)
-  GET_FILENAME_COMPONENT(PARENT_DIR ${PROJECT_SOURCE_DIR} PATH)
+  GET_FILENAME_COMPONENT(PARENT_DIR ${PROJECT_BINARY_DIR} PATH)
   if (CMAKE_CL_64)
     SET(TEST_3RDPARTY_DIR "${PARENT_DIR}/3rdparty.x64")
   else (CMAKE_CL_64)
@@ -165,6 +160,10 @@ if (MSVC AND MSVC_3RDPARTY_ROOT)
   set (OPENAL_LIBRARY_DIR ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/lib)
 endif (MSVC AND MSVC_3RDPARTY_ROOT)
 
+if(APPLE)
+  find_library(CORE_SERVICES_LIBRARY CoreServices)
+endif()
+
 find_package(Boost REQUIRED)
 set (BOOST_CXX_FLAGS "-DBOOST_MULTI_INDEX_DISABLE_SERIALIZATION -DBOOST_BIMAP_DISABLE_SERIALIZATION")
 
@@ -191,23 +190,6 @@ else()
     message(STATUS "JPEG-factory: DISABLED")
 endif(JPEG_FACTORY)
 
-if(ENABLE_LIBSVN)
-    find_package(SvnClient)
-
-    if(LIBSVN_FOUND)
-        message(STATUS "Subversion client support: ENABLED")
-        set(HAVE_SVN_CLIENT_H 1)
-        set(HAVE_LIBSVN_CLIENT_1 1)
-    else()
-        # Oops. ENABLE_LIBSVN is ON, but svn is still missing.
-        # Provide clearly visible warning/hint, so builders know what else they should install (or disable).
-        message(WARNING "Failed to enable subversion client support. Unable to find required subversion client library. Some features may not be available (scenery download).")
-        message(WARNING "Install 'libsvn' library/DLL (libsvn-devel/libsvnclient/...). Otherwise disable subversion support (set 'ENABLE_LIBSVN' to 'OFF').")
-    endif(LIBSVN_FOUND)
-else()
-    message(STATUS "Subversion client support: DISABLED")
-endif(ENABLE_LIBSVN)
-
 find_package(ZLIB REQUIRED)
 find_package(Threads REQUIRED)
 
@@ -215,12 +197,19 @@ if (SYSTEM_EXPAT)
     message(STATUS "Requested to use system Expat library, forcing SIMGEAR_SHARED to true")
     set(SIMGEAR_SHARED ON)
     find_package(EXPAT REQUIRED)
-    include_directories(${EXPAT_INCLUDE_DIRS})
+
 else()
     message(STATUS "Using built-in expat code")
-    add_definitions(-DHAVE_EXPAT_CONFIG_H)
+    # XML_STATIC is important to avoid sg_expat_external.h
+    # declaring symbols as declspec(import)
+    add_definitions(-DHAVE_EXPAT_CONFIG_H -DXML_STATIC)
+    set(EXPAT_INCLUDE_DIRS 
+	    ${PROJECT_SOURCE_DIR}/3rdparty/expat 
+	    ${PROJECT_BINARY_DIR}/3rdparty/expat)
 endif(SYSTEM_EXPAT)
 
+include_directories(${EXPAT_INCLUDE_DIRS})
+
 check_include_file(inttypes.h HAVE_INTTYPES_H)
 check_include_file(sys/time.h HAVE_SYS_TIME_H)
 check_include_file(sys/timeb.h HAVE_SYS_TIMEB_H)
@@ -269,6 +258,20 @@ if(HAVE_CLOCK_GETTIME)
     endif(HAVE_RT)
 endif(HAVE_CLOCK_GETTIME)
 
+set(DL_LIBRARY "")
+check_cxx_source_compiles(
+    "#include <dlfcn.h>
+    int main(void) {
+        return 0;
+    }
+    "
+    HAVE_DLFCN_H)
+
+if(HAVE_DLFCN_H)
+    check_library_exists(dl dlerror "" HAVE_DL)
+    set(DL_LIBRARY "dl")
+endif()
+
 SET(CMAKE_DEBUG_POSTFIX "d" CACHE STRING "add a postfix, usually 'd' on windows")
 SET(CMAKE_RELEASE_POSTFIX "" CACHE STRING "add a postfix, usually empty on windows")
 SET(CMAKE_RELWITHDEBINFO_POSTFIX "" CACHE STRING "add a postfix, usually empty on windows")
@@ -302,6 +305,14 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    set(WARNING_FLAGS_C   "-Wall")
 endif()
 
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+# boost goes haywire wrt static asserts
+    check_cxx_compiler_flag(-Wno-unused-local-typedefs HAS_NOWARN_UNUSED_TYPEDEFS)
+    if(HAS_NOWARN_UNUSED_TYPEDEFS)
+        set(WARNING_FLAGS_CXX " ${WARNING_FLAGS_CXX} -Wno-unused-local-typedefs")
+    endif()
+endif()
+
 if(WIN32)
 
     if(MINGW)
@@ -314,7 +325,10 @@ if(WIN32)
         #     SET(WARNING_FLAGS "${WARNING_FLAGS} /wd${warning}")
         # endforeach(warning)
         
-        set(MSVC_FLAGS "-DWIN32 -DNOMINMAX -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D__CRT_NONSTDC_NO_WARNINGS /wd4996 /wd4250")
+        set(MSVC_FLAGS "-DWIN32 -DNOMINMAX -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D__CRT_NONSTDC_NO_WARNINGS /wd4996 /wd4250 -Dstrdup=_strdup")
+        if (${MSVC_VERSION} GREATER 1599)
+            set( MSVC_LD_FLAGS "/FORCE:MULTIPLE" )
+        endif (${MSVC_VERSION} GREATER 1599)
     endif(MSVC)
     
     # assumed on Windows
@@ -326,15 +340,17 @@ endif(WIN32)
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_FLAGS_C} ${MSVC_FLAGS}")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNING_FLAGS_CXX} ${MSVC_FLAGS} ${BOOST_CXX_FLAGS}")
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${MSVC_LD_FLAGS}")
 
 include_directories(${PROJECT_SOURCE_DIR})
 include_directories(${PROJECT_SOURCE_DIR}/simgear/canvas/ShivaVG/include)
 include_directories(${PROJECT_BINARY_DIR}/simgear)
-include_directories(${PROJECT_BINARY_DIR}/simgear/xml)
 
 include_directories(${OPENSCENEGRAPH_INCLUDE_DIRS} 
-    ${Boost_INCLUDE_DIRS} ${ZLIB_INCLUDE_DIR} 
-    ${OPENAL_INCLUDE_DIR} )
+    ${Boost_INCLUDE_DIRS} 
+    ${ZLIB_INCLUDE_DIR} 
+    ${OPENAL_INCLUDE_DIR}
+)
 
 add_definitions(-DHAVE_CONFIG_H)
 
@@ -345,22 +361,33 @@ configure_file (
   "${PROJECT_BINARY_DIR}/simgear/simgear_config.h"
   )
 
-configure_file (
-    "${PROJECT_SOURCE_DIR}/simgear/xml/expat_config_cmake.in"
-    "${PROJECT_BINARY_DIR}/simgear/xml/expat_config.h"
-)
-
 if(ENABLE_TESTS)
     # enable CTest / make test target
     message(STATUS "Tests: ENABLED")
 
     include (Dart)
-        enable_testing()
+    enable_testing()
 else()
     message(STATUS "Tests: DISABLED")
 endif(ENABLE_TESTS)
 
+# always set TEST_LIBS as it is also used by other tools/applications
+set(TEST_LIBS_INTERNAL_CORE
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${ZLIB_LIBRARY}
+    ${WINSOCK_LIBRARY}
+    ${RT_LIBRARY}
+    ${DL_LIBRARY}
+    ${CORE_SERVICES_LIBRARY})
+set(TEST_LIBS SimGearCore ${TEST_LIBS_INTERNAL_CORE})
+
+if(NOT SIMGEAR_HEADLESS)
+    set(TEST_LIBS SimGearScene ${OPENGL_LIBRARIES} ${TEST_LIBS})
+endif()
+
 install (FILES ${PROJECT_BINARY_DIR}/simgear/simgear_config.h  DESTINATION include/simgear/)
+
+add_subdirectory(3rdparty)
 add_subdirectory(simgear)
 
 #-----------------------------------------------------------------------------
@@ -372,3 +399,5 @@ CONFIGURE_FILE(
   IMMEDIATE @ONLY)
 ADD_CUSTOM_TARGET(uninstall
   "${CMAKE_COMMAND}" -P "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake")
+  
+

CMakeModules/FindSvnClient.cmake

@@ -1,83 +0,0 @@
-# Find Subversion client libraries, and dependencies
-# including APR (Apache Portable Runtime)
-
-include (CheckFunctionExists)
-include (CheckIncludeFile)
-include (CheckLibraryExists)
-
-macro(find_static_component comp libs)
-    # account for alternative Windows svn distribution naming
-    if(MSVC)
-      set(compLib "lib${comp}")
-    else(MSVC)
-      set(compLib "${comp}")
-    endif(MSVC)
-    
-    string(TOUPPER "${comp}" compLibBase)
-    set( compLibName ${compLibBase}_LIBRARY )
-
-    # NO_DEFAULT_PATH is important on Mac - we need to ensure subversion
-    # libraires in dist/ or Macports are picked over the Apple version 
-    # in /usr, since that's what we will ship.
-    # On other platforms we do need default paths though, i.e. since Linux
-    # distros may use architecture-specific directories (like
-    # /usr/lib/x86_64-linux-gnu) which we cannot hardcode/guess here.
-    FIND_LIBRARY(${compLibName}
-if(APPLE)
-      NO_DEFAULT_PATH
-endif(APPLE)
-      NAMES ${compLib}
-      HINTS $ENV{LIBSVN_DIR} ${CMAKE_INSTALL_PREFIX} ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/lib
-      PATH_SUFFIXES lib64 lib libs64 libs libs/Win32 libs/Win64
-      PATHS ${ADDITIONAL_LIBRARY_PATHS}
-    )
-
-	list(APPEND ${libs} ${${compLibName}})
-endmacro()
-
-find_program(HAVE_APR_CONFIG apr-1-config)
-if(HAVE_APR_CONFIG) 
-        
-    execute_process(COMMAND apr-1-config --cppflags --includes
-        OUTPUT_VARIABLE APR_CFLAGS
-        OUTPUT_STRIP_TRAILING_WHITESPACE)
-        
-    execute_process(COMMAND apr-1-config --link-ld
-        OUTPUT_VARIABLE RAW_APR_LIBS
-        OUTPUT_STRIP_TRAILING_WHITESPACE)
-    
-# clean up some vars, or other CMake pieces complain
-	string(STRIP "${RAW_APR_LIBS}" APR_LIBS)
-
-else(HAVE_APR_CONFIG)
-    message(STATUS "apr-1-config not found, implement manual search for APR")
-endif(HAVE_APR_CONFIG)
-
-if(HAVE_APR_CONFIG OR MSVC)
-	find_path(LIBSVN_INCLUDE_DIR svn_client.h
-      NO_DEFAULT_PATH
-	  HINTS
-	  $ENV{LIBSVN_DIR} ${CMAKE_INSTALL_PREFIX} ${MSVC_3RDPARTY_ROOT}/${MSVC_3RDPARTY_DIR}/include
-	  PATH_SUFFIXES include/subversion-1
-	  PATHS
-      /opt/local
-	  /usr/local
-	  /usr
-	)
-	
-	set(LIBSVN_LIBRARIES "")
-	if (MSVC)
-		find_static_component("apr-1" LIBSVN_LIBRARIES)
-	else (MSVC)
-		list(APPEND LIBSVN_LIBRARIES ${APR_LIBS})
-	endif (MSVC)
-	find_static_component("svn_client-1" LIBSVN_LIBRARIES)
-	find_static_component("svn_subr-1" LIBSVN_LIBRARIES)
-	find_static_component("svn_ra-1" LIBSVN_LIBRARIES)
-
-	include(FindPackageHandleStandardArgs)
-	FIND_PACKAGE_HANDLE_STANDARD_ARGS(LIBSVN DEFAULT_MSG LIBSVN_LIBRARIES LIBSVN_INCLUDE_DIR)
-        if(NOT LIBSVN_FOUND)
-		set(LIBSVN_LIBRARIES "")
-        endif(NOT LIBSVN_FOUND)
-endif(HAVE_APR_CONFIG OR MSVC)

Doxyfile

@@ -22,7 +22,7 @@ PROJECT_NAME           = SimGear
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = 2.2.0
+PROJECT_NUMBER         = 2.11.0
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put. 
@@ -56,7 +56,7 @@ EXTRACT_PRIVATE        = NO
 # If the EXTRACT_STATIC tag is set to YES all static members of a file 
 # will be included in the documentation. 
 
-EXTRACT_STATIC         = NO
+EXTRACT_STATIC         = YES
 
 # If the HIDE_UNDOC_MEMBERS tag is set to YES, Doxygen will hide all 
 # undocumented members of documented classes, files or namespaces. 

simgear/CMakeLists.txt

@@ -18,6 +18,7 @@ foreach( mylibfolder
         threads
         timing
         xml
+        package
     )
 
     add_subdirectory(${mylibfolder})
@@ -44,52 +45,29 @@ install (FILES ${HEADERS}  DESTINATION include/simgear/)
 get_property(coreSources GLOBAL PROPERTY CORE_SOURCES)
 get_property(sceneSources GLOBAL PROPERTY SCENE_SOURCES)
 get_property(publicHeaders GLOBAL PROPERTY PUBLIC_HEADERS)
-
-if(LIBSVN_FOUND)
-	add_definitions(${APR_CFLAGS})
-	include_directories(${LIBSVN_INCLUDE_DIR})
-endif()
+get_property(localExpatSources GLOBAL PROPERTY LOCAL_EXPAT_SOURCES)
 
 if(SIMGEAR_SHARED)
     message(STATUS "Library building mode: SHARED LIBRARIES")
-    add_library(SimGearCore SHARED ${coreSources})
+    add_library(SimGearCore SHARED ${coreSources} ${localExpatSources})
 
-  # set_property(TARGET SimGearCore PROPERTY FRAMEWORK 1)
-  #  message(STATUS "public header: ${publicHeaders}")
-  #  set_property(TARGET SimGearCore PROPERTY PUBLIC_HEADER "${publicHeaders}")
     set_property(TARGET SimGearCore PROPERTY LINKER_LANGUAGE CXX)
-
     set_property(TARGET SimGearCore PROPERTY VERSION   ${SIMGEAR_VERSION})
     set_property(TARGET SimGearCore PROPERTY SOVERSION ${SIMGEAR_SOVERSION})
-
-    target_link_libraries(SimGearCore ${ZLIB_LIBRARY} ${RT_LIBRARY} 
-        ${EXPAT_LIBRARIES}
-        ${CMAKE_THREAD_LIBS_INIT})
-
-    if(LIBSVN_FOUND)
-        target_link_libraries(SimGearCore ${LIBSVN_LIBRARIES})
-    endif(LIBSVN_FOUND)
-
+    install(TARGETS SimGearCore EXPORT SimGearCoreConfig LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    install(EXPORT SimGearCoreConfig DESTINATION share/SimGearCore)
+    
     if(NOT SIMGEAR_HEADLESS)
         add_library(SimGearScene SHARED ${sceneSources})
-      # set_property(TARGET SimGearScene PROPERTY FRAMEWORK 1)
-      # set_property(TARGET SimGearScene PROPERTY PUBLIC_HEADER "${publicHeaders}")
         set_property(TARGET SimGearScene PROPERTY LINKER_LANGUAGE CXX)
         set_property(TARGET SimGearScene PROPERTY VERSION   ${SIMGEAR_VERSION})
         set_property(TARGET SimGearScene PROPERTY SOVERSION ${SIMGEAR_SOVERSION})
 
-        target_link_libraries(SimGearScene
-            SimGearCore
-            ${ZLIB_LIBRARY}
-            ${OPENSCENEGRAPH_LIBRARIES}
-            ${OPENAL_LIBRARY}
-            ${OPENGL_LIBRARY}
-            ${JPEG_LIBRARY})
-    
-        install(TARGETS SimGearScene LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+        # EXPORT SimGearSceneConfig
+        install(TARGETS SimGearScene LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} )
+    #    install(EXPORT SimGearSceneConfig DESTINATION share/SimGearScene)
     endif()
     
-    install(TARGETS SimGearCore LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
 else()
     message(STATUS "Library building mode: STATIC LIBRARIES")
 
@@ -111,7 +89,7 @@ else()
 		source_group("${name}\\Headers" FILES ${g2})
 	endforeach()
 
-    add_library(SimGearCore STATIC ${coreSources})
+    add_library(SimGearCore STATIC ${coreSources} ${localExpatSources})
     install(TARGETS SimGearCore ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
     
     if(NOT SIMGEAR_HEADLESS)
@@ -138,6 +116,24 @@ else()
     endif(NOT SIMGEAR_HEADLESS)
 endif(SIMGEAR_SHARED)
 
+target_link_libraries(SimGearCore
+    ${ZLIB_LIBRARY}
+    ${RT_LIBRARY}
+    ${DL_LIBRARY}
+    ${EXPAT_LIBRARIES}
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${CORE_SERVICES_LIBRARY})
+
+if(NOT SIMGEAR_HEADLESS)
+    target_link_libraries(SimGearScene
+        SimGearCore
+        ${ZLIB_LIBRARY}
+        ${OPENSCENEGRAPH_LIBRARIES}
+        ${OPENAL_LIBRARY}
+        ${OPENGL_LIBRARY}
+        ${JPEG_LIBRARY})
+endif()
+
 if(ENABLE_RTI)
     # Ugly first aid to make hla compile agian
     set_property(SOURCE hla/RTI13InteractionClass.cxx hla/RTI13ObjectClass.cxx

simgear/bucket/newbucket.cxx

@@ -212,7 +212,7 @@ std::string SGBucket::gen_base_path() const {
 	main_lat *= -1;
     }
 
-    sprintf(raw_path, "%c%03d%c%02d/%c%03d%c%02d", 
+    snprintf(raw_path, 256, "%c%03d%c%02d/%c%03d%c%02d", 
 	    hem, top_lon, pole, top_lat, 
 	    hem, main_lon, pole, main_lat);
 
@@ -224,17 +224,6 @@ std::string SGBucket::gen_base_path() const {
 
 // return width of the tile in degrees
 double SGBucket::get_width() const {
-    if (lon==-180 && (lat==-89 || lat==88) ) {
-        /* Normally the tile at 180W in 88N and 89S
-         * would cover 184W to 176W and the next
-         * on the east side starts at 176W.
-         * To correct, make this a special tile
-         * from 180W to 176W with 4 degrees width
-         * instead of the normal 8 degrees at
-         * that latitude.
-         */
-         return 4.0;
-    }
     return sg_bucket_span( get_center_lat() );
 }
 
@@ -356,4 +345,13 @@ void sgBucketDiff( const SGBucket& b1, const SGBucket& b2, int *dx, int *dy ) {
 #endif
 }
 
+void sgGetBuckets( const SGGeod& min, const SGGeod& max, std::vector<SGBucket>& list ) {
+    double lon, lat, span;
 
+    for (lat = min.getLatitudeDeg(); lat <= max.getLatitudeDeg(); lat += SG_BUCKET_SPAN) {
+        span = sg_bucket_span( lat );
+        for (lon = min.getLongitudeDeg(); lon <= max.getLongitudeDeg(); lon += span) {
+            list.push_back( SGBucket(lon , lat) );
+        }
+    }
+}

simgear/bucket/newbucket.hxx

@@ -42,6 +42,7 @@
 #include <cstdio> // sprintf()
 #include <ostream>
 #include <string>
+#include <vector>
 
 /**
  * standard size of a bucket in degrees (1/8 of a degree)
@@ -57,9 +58,7 @@
 // return the horizontal tile span factor based on latitude
 static double sg_bucket_span( double l ) {
     if ( l >= 89.0 ) {
-	return 360.0;
-    } else if ( l >= 88.0 ) {
-	return 8.0;
+	return 12.0;
     } else if ( l >= 86.0 ) {
 	return 4.0;
     } else if ( l >= 83.0 ) {
@@ -80,12 +79,10 @@ static double sg_bucket_span( double l ) {
 	return 1.0;
     } else if ( l >= -86.0 ) {
 	return 2.0;
-    } else if ( l >= -88.0 ) {
-	return 4.0;
     } else if ( l >= -89.0 ) {
-	return 8.0;
+	return 4.0;
     } else {
-	return 360.0;
+	return 12.0;
     }
 }
 
@@ -326,6 +323,15 @@ SGBucket sgBucketOffset( double dlon, double dlat, int x, int y );
 void sgBucketDiff( const SGBucket& b1, const SGBucket& b2, int *dx, int *dy );
 
 
+/**
+ * \relates SGBucket
+ * retrieve a list of buckets in the given bounding box
+ * @param min min lon,lat of bounding box in degrees
+ * @param max max lon,lat of bounding box in degrees
+ * @param list standard vector of buckets within the bounding box
+ */
+void sgGetBuckets( const SGGeod& min, const SGGeod& max, std::vector<SGBucket>& list );
+
 /**
  * Write the bucket lon, lat, x, and y to the output stream.
  * @param out output stream

simgear/canvas/CMakeLists.txt

@@ -4,11 +4,11 @@ set(HEADERS
   canvas_fwd.hxx
   Canvas.hxx
   CanvasEvent.hxx
-  CanvasEventListener.hxx
   CanvasEventManager.hxx
   CanvasEventTypes.hxx
   CanvasEventVisitor.hxx
   CanvasMgr.hxx
+  CanvasObjectPlacement.hxx
   CanvasPlacement.hxx
   CanvasSystemAdapter.hxx
   MouseEvent.hxx
@@ -19,10 +19,10 @@ set(HEADERS
 set(SOURCES
   Canvas.cxx
   CanvasEvent.cxx
-  CanvasEventListener.cxx
   CanvasEventManager.cxx
   CanvasEventVisitor.cxx
   CanvasMgr.cxx
+  CanvasObjectPlacement.cxx
   CanvasPlacement.cxx
   ODGauge.cxx
   VGInitOperation.cxx

simgear/canvas/Canvas.cxx

@@ -31,7 +31,6 @@
 
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/foreach.hpp>
-#include <iostream>
 
 namespace simgear
 {
@@ -82,16 +81,13 @@ namespace canvas
   }
 
   //----------------------------------------------------------------------------
-  void Canvas::setSystemAdapter(const SystemAdapterPtr& system_adapter)
+  void Canvas::onDestroy()
   {
-    _system_adapter = system_adapter;
-    _texture.setSystemAdapter(system_adapter);
-  }
-
-  //----------------------------------------------------------------------------
-  SystemAdapterPtr Canvas::getSystemAdapter() const
-  {
-    return _system_adapter;
+    if( _root_group )
+    {
+      _root_group->clearEventListener();
+      _root_group->onDestroy();
+    }
   }
 
   //----------------------------------------------------------------------------
@@ -107,7 +103,13 @@ namespace canvas
   }
 
   //----------------------------------------------------------------------------
-  void Canvas::addDependentCanvas(const CanvasWeakPtr& canvas)
+  bool Canvas::isInit() const
+  {
+    return _texture.serviceable();
+  }
+
+  //----------------------------------------------------------------------------
+  void Canvas::addParentCanvas(const CanvasWeakPtr& canvas)
   {
     if( canvas.expired() )
     {
@@ -115,28 +117,67 @@ namespace canvas
       (
         SG_GENERAL,
         SG_WARN,
-        "Canvas::addDependentCanvas: got an expired Canvas dependent on "
-        << _node->getPath()
+        "Canvas::addParentCanvas(" << _node->getPath(true) << "): "
+        "got an expired parent!"
       );
       return;
     }
 
-    _dependent_canvases.insert(canvas);
+    _parent_canvases.insert(canvas);
   }
 
   //----------------------------------------------------------------------------
-  void Canvas::removeDependentCanvas(const CanvasWeakPtr& canvas)
+  void Canvas::addChildCanvas(const CanvasWeakPtr& canvas)
   {
-    _dependent_canvases.erase(canvas);
+    if( canvas.expired() )
+    {
+      SG_LOG
+      (
+        SG_GENERAL,
+        SG_WARN,
+        "Canvas::addChildCanvas(" << _node->getPath(true) << "): "
+        " got an expired child!"
+      );
+      return;
+    }
+
+    _child_canvases.insert(canvas);
+  }
+
+  //----------------------------------------------------------------------------
+  void Canvas::removeParentCanvas(const CanvasWeakPtr& canvas)
+  {
+    _parent_canvases.erase(canvas);
+  }
+
+  //----------------------------------------------------------------------------
+  void Canvas::removeChildCanvas(const CanvasWeakPtr& canvas)
+  {
+    _child_canvases.erase(canvas);
   }
 
   //----------------------------------------------------------------------------
   GroupPtr Canvas::createGroup(const std::string& name)
   {
-    return boost::dynamic_pointer_cast<Group>
-    (
-      _root_group->createChild("group", name)
-    );
+    return _root_group->createChild<Group>(name);
+  }
+
+  //----------------------------------------------------------------------------
+  GroupPtr Canvas::getGroup(const std::string& name)
+  {
+    return _root_group->getChild<Group>(name);
+  }
+
+  //----------------------------------------------------------------------------
+  GroupPtr Canvas::getOrCreateGroup(const std::string& name)
+  {
+    return _root_group->getOrCreateChild<Group>(name);
+  }
+
+  //----------------------------------------------------------------------------
+  GroupPtr Canvas::getRootGroup()
+  {
+    return _root_group;
   }
 
   //----------------------------------------------------------------------------
@@ -168,24 +209,21 @@ namespace canvas
       {
         // Resizing causes a new texture to be created so we need to reapply all
         // existing placements
-        for(size_t i = 0; i < _placements.size(); ++i)
-        {
-          if( !_placements[i].empty() )
-            _dirty_placements.push_back( _placements[i].front()->getProps() );
-        }
+        reloadPlacements();
       }
 
       osg::Camera* camera = _texture.getCamera();
 
+      // TODO Allow custom render order? For now just keep in order with
+      //      property tree.
+      camera->setRenderOrder(osg::Camera::PRE_RENDER, _node->getIndex());
+
       osg::Vec4 clear_color(0.0f, 0.0f, 0.0f , 1.0f);
       parseColor(_node->getStringValue("background"), clear_color);
       camera->setClearColor(clear_color);
 
       camera->addChild(_root_group->getMatrixTransform());
 
-      // Ensure objects are drawn in order of traversal
-      camera->getOrCreateStateSet()->setBinName("TraversalOrderBin");
-
       if( _texture.serviceable() )
       {
         setStatusFlags(STATUS_OK);
@@ -201,10 +239,18 @@ namespace canvas
 
     if( _visible || _render_always )
     {
+      BOOST_FOREACH(CanvasWeakPtr canvas, _child_canvases)
+      {
+        // TODO should we check if the image the child canvas is displayed
+        //      within is really visible?
+        if( !canvas.expired() )
+          canvas.lock()->_visible = true;
+      }
+
       if( _render_dirty )
       {
-        // Also mark all dependent (eg. recursively used) canvases as dirty
-        BOOST_FOREACH(CanvasWeakPtr canvas, _dependent_canvases)
+        // Also mark all canvases this canvas is displayed within as dirty
+        BOOST_FOREACH(CanvasWeakPtr canvas, _parent_canvases)
         {
           if( !canvas.expired() )
             canvas.lock()->_render_dirty = true;
@@ -267,12 +313,13 @@ namespace canvas
   }
 
   //----------------------------------------------------------------------------
-  naRef Canvas::addEventListener(const nasal::CallContext& ctx)
+  bool Canvas::addEventListener( const std::string& type,
+                                 const EventListener& cb )
   {
     if( !_root_group.get() )
-      naRuntimeError(ctx.c, "Canvas: No root group!");
+      throw std::runtime_error("Canvas::AddEventListener: no root group!");
 
-    return _root_group->addEventListener(ctx);
+    return _root_group->addEventListener(type, cb);
   }
 
   //----------------------------------------------------------------------------
@@ -344,13 +391,19 @@ namespace canvas
   //----------------------------------------------------------------------------
   int Canvas::getViewWidth() const
   {
-    return _view_width;
+    return _texture.getViewSize().x();
   }
 
   //----------------------------------------------------------------------------
   int Canvas::getViewHeight() const
   {
-    return _view_height;
+    return _texture.getViewSize().y();
+  }
+
+  //----------------------------------------------------------------------------
+  SGRect<int> Canvas::getViewport() const
+  {
+    return SGRect<int>(0, 0, getViewWidth(), getViewHeight());
   }
 
   //----------------------------------------------------------------------------
@@ -361,7 +414,8 @@ namespace canvas
 
     EventVisitor visitor( EventVisitor::TRAVERSE_DOWN,
                           event->getClientPos(),
-                          event->getDelta() );
+                          event->getDelta(),
+                          _root_group );
     if( !_root_group->accept(visitor) )
       return false;
 
@@ -408,21 +462,26 @@ namespace canvas
     if(    node->getParent()->getParent() == _node
         && node->getParent()->getNameString() == "placement" )
     {
-      bool placement_dirty = false;
-      BOOST_FOREACH(Placements& placements, _placements)
+      size_t index = node->getIndex();
+      if( index < _placements.size() )
       {
-        BOOST_FOREACH(PlacementPtr& placement, placements)
+        Placements& placements = _placements[index];
+        if( !placements.empty() )
         {
-          // check if change can be directly handled by placement
-          if(    placement->getProps() == node->getParent()
-              && !placement->childChanged(node) )
-            placement_dirty = true;
+          bool placement_dirty = false;
+          BOOST_FOREACH(PlacementPtr& placement, placements)
+          {
+            // check if change can be directly handled by placement
+            if(    placement->getProps() == node->getParent()
+                && !placement->childChanged(node) )
+              placement_dirty = true;
+          }
+
+          if( !placement_dirty )
+            return;
         }
       }
 
-      if( !placement_dirty )
-        return;
-
       // prevent double updates...
       for( size_t i = 0; i < _dirty_placements.size(); ++i )
       {
@@ -449,6 +508,10 @@ namespace canvas
       {
         _sampling_dirty = true;
       }
+      else if( node->getNameString() == "additive-blend" )
+      {
+        _texture.useAdditiveBlend( node->getBoolValue() );
+      }
       else if( node->getNameString() == "render-always" )
       {
         _render_always = node->getBoolValue();
@@ -491,6 +554,24 @@ namespace canvas
     return _cull_callback;
   }
 
+  //----------------------------------------------------------------------------
+  void Canvas::reloadPlacements(const std::string& type)
+  {
+    for(size_t i = 0; i < _placements.size(); ++i)
+    {
+      if( _placements[i].empty() )
+        continue;
+
+      SGPropertyNode* child = _placements[i].front()->getProps();
+      if(    type.empty()
+             // reload if type matches or no type specified
+          || child->getStringValue("type", type.c_str()) == type )
+      {
+        _dirty_placements.push_back(child);
+      }
+    }
+  }
+
   //----------------------------------------------------------------------------
   void Canvas::addPlacementFactory( const std::string& type,
                                     PlacementFactory factory )
@@ -500,12 +581,40 @@ namespace canvas
       (
         SG_GENERAL,
         SG_WARN,
-        "Canvas::addPlacementFactory: replace existing factor for type " << type
+        "Canvas::addPlacementFactory: replace existing factory '" << type << "'"
       );
 
     _placement_factories[type] = factory;
   }
 
+  //----------------------------------------------------------------------------
+  void Canvas::removePlacementFactory(const std::string& type)
+  {
+    PlacementFactoryMap::iterator it = _placement_factories.find(type);
+    if( it == _placement_factories.end() )
+      SG_LOG
+      (
+        SG_GENERAL,
+        SG_WARN,
+        "Canvas::removePlacementFactory: no such factory '" << type << "'"
+      );
+    else
+      _placement_factories.erase(it);
+  }
+
+
+  //----------------------------------------------------------------------------
+  void Canvas::setSystemAdapter(const SystemAdapterPtr& system_adapter)
+  {
+    _system_adapter = system_adapter;
+  }
+
+  //----------------------------------------------------------------------------
+  SystemAdapterPtr Canvas::getSystemAdapter()
+  {
+    return _system_adapter;
+  }
+
   //----------------------------------------------------------------------------
   void Canvas::setSelf(const PropertyBasedElementPtr& self)
   {
@@ -547,6 +656,7 @@ namespace canvas
 
   //----------------------------------------------------------------------------
   Canvas::PlacementFactoryMap Canvas::_placement_factories;
+  SystemAdapterPtr Canvas::_system_adapter;
 
 } // namespace canvas
 } // namespace simgear

simgear/canvas/Canvas.hxx

@@ -23,12 +23,13 @@
 #include "ODGauge.hxx"
 
 #include <simgear/canvas/elements/CanvasGroup.hxx>
+#include <simgear/math/SGRect.hxx>
 #include <simgear/props/PropertyBasedElement.hxx>
 #include <simgear/props/propertyObject.hxx>
 #include <osg/NodeCallback>
 #include <osg/observer_ptr>
 
-#include <memory>
+#include <boost/scoped_ptr.hpp>
 #include <string>
 
 namespace simgear
@@ -71,29 +72,54 @@ namespace canvas
 
       Canvas(SGPropertyNode* node);
       virtual ~Canvas();
-
-      void setSystemAdapter(const SystemAdapterPtr& system_adapter);
-      SystemAdapterPtr getSystemAdapter() const;
+      virtual void onDestroy();
 
       void setCanvasMgr(CanvasMgr* canvas_mgr);
       CanvasMgr* getCanvasMgr() const;
 
+      bool isInit() const;
+
       /**
-       * Add a canvas which should be mared as dirty upon any change to this
+       * Add a canvas which should be marked as dirty upon any change to this
        * canvas.
        *
        * This mechanism is used to eg. redraw a canvas if it's displaying
        * another canvas (recursive canvases)
        */
-      void addDependentCanvas(const CanvasWeakPtr& canvas);
+      void addParentCanvas(const CanvasWeakPtr& canvas);
+
+      /**
+       * Add a canvas which should be marked visible if this canvas is visible.
+       */
+      void addChildCanvas(const CanvasWeakPtr& canvas);
 
       /**
        * Stop notifying the given canvas upon changes
        */
-      void removeDependentCanvas(const CanvasWeakPtr& canvas);
+      void removeParentCanvas(const CanvasWeakPtr& canvas);
+      void removeChildCanvas(const CanvasWeakPtr& canvas);
 
+      /**
+       * Create a new group
+       */
       GroupPtr createGroup(const std::string& name = "");
 
+      /**
+       * Get an existing group with the given name
+       */
+      GroupPtr getGroup(const std::string& name);
+
+      /**
+       * Get an existing group with the given name or otherwise create a new
+       * group
+       */
+      GroupPtr getOrCreateGroup(const std::string& name);
+
+      /**
+       * Get the root group of the canvas
+       */
+      GroupPtr getRootGroup();
+
       /**
        * Enable rendering for the next frame
        *
@@ -104,7 +130,7 @@ namespace canvas
 
       void update(double delta_time_sec);
 
-      naRef addEventListener(const nasal::CallContext& ctx);
+      bool addEventListener(const std::string& type, const EventListener& cb);
 
       void setSizeX(int sx);
       void setSizeY(int sy);
@@ -117,6 +143,7 @@ namespace canvas
 
       int getViewWidth() const;
       int getViewHeight() const;
+      SGRect<int> getViewport() const;
 
       bool handleMouseEvent(const MouseEventPtr& event);
 
@@ -130,15 +157,26 @@ namespace canvas
 
       CullCallbackPtr getCullCallback() const;
 
+      void reloadPlacements( const std::string& type = std::string() );
       static void addPlacementFactory( const std::string& type,
                                        PlacementFactory factory );
+      static void removePlacementFactory(const std::string& type);
+
+      /**
+       * Set global SystemAdapter for all Canvas/ODGauge instances.
+       *
+       * The SystemAdapter is responsible for application specific operations
+       * like loading images/fonts and adding/removing cameras to the scene
+       * graph.
+       */
+      static void setSystemAdapter(const SystemAdapterPtr& system_adapter);
+      static SystemAdapterPtr getSystemAdapter();
 
     protected:
 
-      SystemAdapterPtr  _system_adapter;
       CanvasMgr        *_canvas_mgr;
 
-      std::auto_ptr<EventManager>   _event_manager;
+      boost::scoped_ptr<EventManager> _event_manager;
 
       int _size_x,
           _size_y,
@@ -160,9 +198,9 @@ namespace canvas
 
       std::vector<SGPropertyNode*> _dirty_placements;
       std::vector<Placements> _placements;
-      std::set<CanvasWeakPtr> _dependent_canvases; //<! Canvases which use this
-                                                   //   canvas and should be
-                                                   //   notified about changes
+      std::set<CanvasWeakPtr> _parent_canvases, //<! Canvases showing this canvas
+                              _child_canvases;  //<! Canvases displayed within
+                                                //   this canvas
 
       typedef std::map<std::string, PlacementFactory> PlacementFactoryMap;
       static PlacementFactoryMap _placement_factories;
@@ -172,6 +210,8 @@ namespace canvas
 
     private:
 
+      static SystemAdapterPtr _system_adapter;
+
       Canvas(const Canvas&); // = delete;
       Canvas& operator=(const Canvas&); // = delete;
   };

simgear/canvas/CanvasEvent.cxx

@@ -62,6 +62,12 @@ namespace canvas
     return target;
   }
 
+  //----------------------------------------------------------------------------
+  ElementWeakPtr Event::getCurrentTarget() const
+  {
+    return current_target;
+  }
+
   //----------------------------------------------------------------------------
   double Event::getTime() const
   {

simgear/canvas/CanvasEvent.hxx

@@ -41,7 +41,8 @@ namespace canvas
       };
 
       Type              type;
-      ElementWeakPtr    target;
+      ElementWeakPtr    target,
+                        current_target;
       double            time;
       bool              propagation_stopped;
 
@@ -55,6 +56,7 @@ namespace canvas
       std::string getTypeString() const;
 
       ElementWeakPtr getTarget() const;
+      ElementWeakPtr getCurrentTarget() const;
 
       double getTime() const;
 

simgear/canvas/CanvasEventListener.cxx

@@ -1,70 +0,0 @@
-// Listener for canvas (GUI) events being passed to a Nasal function/code
-//
-// Copyright (C) 2012  Thomas Geymayer <tomgey@gmail.com>
-//
-// This library is free software; you can redistribute it and/or
-// modify it under the terms of the GNU Library General Public
-// License as published by the Free Software Foundation; either
-// version 2 of the License, or (at your option) any later version.
-//
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-// Library General Public License for more details.
-//
-// You should have received a copy of the GNU Library General Public
-// License along with this library; if not, write to the Free Software
-// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
-
-#include "CanvasEvent.hxx"
-#include "CanvasEventListener.hxx"
-#include "CanvasSystemAdapter.hxx"
-
-#include <simgear/nasal/cppbind/Ghost.hxx>
-
-namespace simgear
-{
-namespace canvas
-{
-
-  //----------------------------------------------------------------------------
-  EventListener::EventListener(naRef code, const SystemAdapterPtr& sys_adapter):
-    _code(code),
-    _gc_key(-1),
-    _sys(sys_adapter)
-  {
-    assert( sys_adapter );
-    if(    !naIsCode(code)
-        && !naIsCCode(code)
-        && !naIsFunc(code) )
-      throw std::runtime_error
-      (
-        "canvas::EventListener: invalid function argument"
-      );
-
-    _gc_key = sys_adapter->gcSave(_code);
-  }
-
-  //----------------------------------------------------------------------------
-  EventListener::~EventListener()
-  {
-    assert( !_sys.expired() );
-    _sys.lock()->gcRelease(_gc_key);
-  }
-
-  //----------------------------------------------------------------------------
-  void EventListener::call(const canvas::EventPtr& event)
-  {
-    SystemAdapterPtr sys = _sys.lock();
-
-    naRef args[] = {
-      nasal::Ghost<EventPtr>::create(sys->getNasalContext(), event)
-    };
-    const int num_args = sizeof(args)/sizeof(args[0]);
-
-    sys->callMethod(_code, naNil(), num_args, args, naNil());
-  }
-
-
-} // namespace canvas
-} // namespace simgear

simgear/canvas/CanvasEventManager.cxx

@@ -19,6 +19,7 @@
 #include "CanvasEventManager.hxx"
 #include "MouseEvent.hxx"
 #include <simgear/canvas/elements/CanvasElement.hxx>
+#include <cmath>
 
 namespace simgear
 {
@@ -71,6 +72,7 @@ namespace canvas
   bool EventManager::handleEvent( const MouseEventPtr& event,
                                   const EventPropagationPath& path )
   {
+    bool handled = false;
     switch( event->type )
     {
       case Event::MOUSE_DOWN:
@@ -78,20 +80,27 @@ namespace canvas
         break;
       case Event::MOUSE_UP:
       {
-        if( _last_mouse_down.path.empty() )
-          // Ignore mouse up without any previous mouse down
-          return false;
+        // If the mouse has moved while a button was down (aka. dragging) we
+        // need to notify the original element that the mouse has left it, and
+        // the new element that it has been entered
+        if( _last_mouse_down.path != path )
+          handled |= handleMove(event, path);
 
         // normal mouseup
-        propagateEvent(event, path);
+        handled |= propagateEvent(event, path);
+
+        if( _last_mouse_down.path.empty() )
+          // Ignore mouse up without any previous mouse down
+          return handled;
 
         // now handle click/dblclick
         if( checkClickDistance(path, _last_mouse_down.path) )
-          handleClick(event, getCommonAncestor(_last_mouse_down.path, path));
+          handled |=
+            handleClick(event, getCommonAncestor(_last_mouse_down.path, path));
 
         _last_mouse_down.clear();
 
-        return true;
+        return handled;
       }
       case Event::DRAG:
         if( !_last_mouse_down.valid() )
@@ -99,11 +108,18 @@ namespace canvas
         else
           return propagateEvent(event, _last_mouse_down.path);
       case Event::MOUSE_MOVE:
-        handleMove(event, path);
+        handled |= handleMove(event, path);
         break;
       case Event::MOUSE_LEAVE:
         // Mouse leaves window and therefore also current mouseover element
         handleMove(event, EventPropagationPath());
+
+        // Event is only send if mouse is moved outside the window or dragging
+        // has ended somewhere outside the window. In both cases a mouse button
+        // has been released, so no more mouse down or click...
+        _last_mouse_down.clear();
+        _last_click.clear();
+
         return true;
       case Event::WHEEL:
         break;
@@ -111,11 +127,11 @@ namespace canvas
         return false;
     }
 
-    return propagateEvent(event, path);
+    return handled | propagateEvent(event, path);
   }
 
   //----------------------------------------------------------------------------
-  void EventManager::handleClick( const MouseEventPtr& event,
+  bool EventManager::handleClick( const MouseEventPtr& event,
                                   const EventPropagationPath& path )
   {
     MouseEventPtr click(new MouseEvent(*event));
@@ -145,36 +161,76 @@ namespace canvas
       dbl_click->type = Event::DBL_CLICK;
     }
 
-    propagateEvent(click, path);
+    bool handled = propagateEvent(click, path);
 
     if( dbl_click )
-      propagateEvent(dbl_click, getCommonAncestor(_last_click.path, path));
+      handled |= propagateEvent( dbl_click,
+                                 getCommonAncestor(_last_click.path, path) );
 
     _last_click = StampedPropagationPath(path, event->getTime());
+
+    return handled;
   }
 
   //----------------------------------------------------------------------------
-  void EventManager::handleMove( const MouseEventPtr& event,
+  bool EventManager::handleMove( const MouseEventPtr& event,
                                  const EventPropagationPath& path )
   {
-    if( _last_mouse_over.path == path )
-      return;
+    EventPropagationPath& last_path = _last_mouse_over.path;
+    if( last_path == path )
+      return false;
 
-    if( !_last_mouse_over.path.empty() )
+    bool handled = false;
+
+    // Leave old element
+    if( !last_path.empty() )
     {
       MouseEventPtr mouseout(new MouseEvent(*event));
       mouseout->type = Event::MOUSE_OUT;
-      propagateEvent(mouseout, _last_mouse_over.path);
+      handled |= propagateEvent(mouseout, last_path);
+
+      // Send a mouseleave event to all ancestors of the currently left element
+      // which are not ancestor of the new element currently entered
+      EventPropagationPath path_leave = last_path;
+      for(size_t i = path_leave.size() - 1; i > 0; --i)
+      {
+        if( i < path.size() && path[i] == path_leave[i] )
+          break;
+
+        MouseEventPtr mouseleave(new MouseEvent(*event));
+        mouseleave->type = Event::MOUSE_LEAVE;
+        handled |= propagateEvent(mouseleave, path_leave);
+
+        path_leave.pop_back();
+      }
     }
 
+    // Enter new element
     if( !path.empty() )
     {
       MouseEventPtr mouseover(new MouseEvent(*event));
       mouseover->type = Event::MOUSE_OVER;
-      propagateEvent(mouseover, path);
+      handled |= propagateEvent(mouseover, path);
+
+      // Send a mouseenter event to all ancestors of the currently entered
+      // element which are not ancestor of the old element currently being
+      // left
+      EventPropagationPath path_enter;
+      for(size_t i = 0; i < path.size(); ++i)
+      {
+        path_enter.push_back(path[i]);
+
+        if( i < last_path.size() && path[i] == last_path[i] )
+          continue;
+
+        MouseEventPtr mouseenter(new MouseEvent(*event));
+        mouseenter->type = Event::MOUSE_ENTER;
+        handled |= propagateEvent(mouseenter, path_enter);
+      }
     }
 
     _last_mouse_over.path = path;
+    return handled;
   }
 
   //----------------------------------------------------------------------------
@@ -188,15 +244,29 @@ namespace canvas
     // http://www.w3.org/TR/DOM-Level-3-Events/#event-flow
 
     // Capturing phase
-//    for( EventTargets::iterator it = _target_path.begin();
-//                                it != _target_path.end();
-//                              ++it )
+//    for( EventPropagationPath::const_iterator it = path.begin();
+//                                              it != path.end();
+//                                            ++it )
 //    {
-//      if( it->element )
-//        std::cout << it->element->getProps()->getPath() << " "
-//                  << "(" << it->local_pos.x() << "|" << it->local_pos.y() << ")\n";
+//      if( !it->element.expired() )
+//        std::cout << it->element.lock()->getProps()->getPath() << std::endl;
 //    }
 
+    // Check if event supports bubbling
+    const Event::Type types_no_bubbling[] = {
+      Event::MOUSE_ENTER,
+      Event::MOUSE_LEAVE,
+    };
+    const size_t num_types_no_bubbling = sizeof(types_no_bubbling)
+                                       / sizeof(types_no_bubbling[0]);
+    bool do_bubble = true;
+    for( size_t i = 0; i < num_types_no_bubbling; ++i )
+      if( event->type == types_no_bubbling[i] )
+      {
+        do_bubble = false;
+        break;
+      }
+
     // Bubbling phase
     for( EventPropagationPath::const_reverse_iterator
            it = path.rbegin();
@@ -206,29 +276,34 @@ namespace canvas
       ElementPtr el = it->element.lock();
 
       if( !el )
+      {
         // Ignore element if it has been destroyed while traversing the event
         // (eg. removed by another event handler)
-        continue;
+        if( do_bubble )
+          continue;
+        else
+          break;
+      }
 
-      // TODO provide functions to convert position and delta to local
-      //      coordinates on demand. Events shouldn't contain informations in
-      //      local coordinates as they might differe between different elements
-      //      receiving the same event.
-//      if( mouse_event && event->type != Event::DRAG )
-//      {
-//        // TODO transform pos and delta for drag events. Maybe we should just
-//        //      store the global coordinates and convert to local coordinates
-//        //      on demand.
-//
-//        // Position and delta are specified in local coordinate system of
-//        // current element
-//        mouse_event->pos = it->local_pos;
-//        mouse_event->delta = it->local_delta;
-//      }
+      // TODO provide functions to convert delta to local coordinates on demand.
+      //      Maybe also provide a clone method for events as local coordinates
+      //      might differ between different elements receiving the same event.
+      if( mouse_event ) //&& event->type != Event::DRAG )
+      {
+        // TODO transform pos and delta for drag events. Maybe we should just
+        //      store the global coordinates and convert to local coordinates
+        //      on demand.
 
-      el->callListeners(event);
+        // Position and delta are specified in local coordinate system of
+        // current element
+        mouse_event->local_pos = it->local_pos;
+        //mouse_event->delta = it->local_delta;
+      }
 
-      if( event->propagation_stopped )
+      event->current_target = el;
+      el->handleEvent(event);
+
+      if( event->propagation_stopped || !do_bubble )
         return true;
     }
 
@@ -241,8 +316,8 @@ namespace canvas
                                     const EventPropagationPath& path2 ) const
   {
     osg::Vec2 delta = path1.front().local_pos - path2.front().local_pos;
-    return delta.x() < drag_threshold
-        && delta.y() < drag_threshold;
+    return std::fabs(delta.x()) < drag_threshold
+        && std::fabs(delta.y()) < drag_threshold;
   }
 
   //----------------------------------------------------------------------------
@@ -250,6 +325,9 @@ namespace canvas
   EventManager::getCommonAncestor( const EventPropagationPath& path1,
                                    const EventPropagationPath& path2 ) const
   {
+    if( path1.empty() || path2.empty() )
+      return EventPropagationPath();
+
     if( path1.back().element.lock() == path2.back().element.lock() )
       return path2;
 

simgear/canvas/CanvasEventManager.hxx

@@ -70,13 +70,13 @@ namespace canvas
       /**
        * Propagate click event and handle multi-click (eg. create dblclick)
        */
-      void handleClick( const MouseEventPtr& event,
+      bool handleClick( const MouseEventPtr& event,
                         const EventPropagationPath& path );
 
       /**
        * Handle mouseover/enter/out/leave
        */
-      void handleMove( const MouseEventPtr& event,
+      bool handleMove( const MouseEventPtr& event,
                        const EventPropagationPath& path );
 
       bool propagateEvent( const EventPtr& event,

simgear/canvas/CanvasEventVisitor.cxx

@@ -30,8 +30,10 @@ namespace canvas
   //----------------------------------------------------------------------------
   EventVisitor::EventVisitor( TraverseMode mode,
                               const osg::Vec2f& pos,
-                              const osg::Vec2f& delta ):
-    _traverse_mode( mode )
+                              const osg::Vec2f& delta,
+                              const ElementPtr& root ):
+    _traverse_mode( mode ),
+    _root(root)
   {
     if( mode == TRAVERSE_DOWN )
     {
@@ -70,10 +72,11 @@ namespace canvas
         m(0, 1) * pos[0] + m(1, 1) * pos[1] + m(3, 1)
       );
 
-      // Don't check collision with root element (2nd element in _target_path)
-      // do event listeners attached to the canvas itself (its root group)
-      // always get called even if no element has been hit.
-      if( _target_path.size() > 2 && !el.hitBound(pos, local_pos) )
+      // Don't check specified root element for collision, as its purpose is to
+      // catch all events which have no target. This allows for example calling
+      // event listeners attached to the canvas itself (its root group) even if
+      // no element has been hit.
+      if( _root.get() != &el && !el.hitBound(pos, local_pos) )
         return false;
 
       const osg::Vec2f& delta = _target_path.back().local_delta;
@@ -86,7 +89,7 @@ namespace canvas
       EventTarget target = {el.getWeakPtr(), local_pos, local_delta};
       _target_path.push_back(target);
 
-      if( el.traverse(*this) || _target_path.size() <= 2 )
+      if( el.traverse(*this) || &el == _root.get() )
         return true;
 
       _target_path.pop_back();

simgear/canvas/CanvasEventVisitor.hxx

@@ -38,9 +38,17 @@ namespace canvas
         TRAVERSE_DOWN
       };
 
+      /**
+       *
+       * @param mode
+       * @param pos     Mouse position
+       * @param delta   Mouse movement since last mouse move event
+       * @param root    Element to dispatch events to if no element is hit
+       */
       EventVisitor( TraverseMode mode,
                     const osg::Vec2f& pos,
-                    const osg::Vec2f& delta );
+                    const osg::Vec2f& delta,
+                    const ElementPtr& root = ElementPtr() );
       virtual ~EventVisitor();
       virtual bool traverse(Element& el);
       virtual bool apply(Element& el);
@@ -51,6 +59,7 @@ namespace canvas
 
       TraverseMode          _traverse_mode;
       EventPropagationPath  _target_path;
+      ElementPtr            _root;
 
   };
 

simgear/canvas/CanvasMgr.cxx

@@ -18,6 +18,7 @@
 
 #include "CanvasMgr.hxx"
 #include "Canvas.hxx"
+#include "CanvasEventManager.hxx"
 
 #include <boost/bind.hpp>
 
@@ -35,10 +36,8 @@ namespace canvas
   }
 
   //----------------------------------------------------------------------------
-  CanvasMgr::CanvasMgr( SGPropertyNode_ptr node,
-                        SystemAdapterPtr system_adapter ):
-    PropertyBasedMgr(node, "texture", &canvasFactory),
-    _system_adapter(system_adapter)
+  CanvasMgr::CanvasMgr(SGPropertyNode_ptr node):
+    PropertyBasedMgr(node, "texture", &canvasFactory)
   {
 
   }
@@ -65,7 +64,6 @@ namespace canvas
   void CanvasMgr::elementCreated(PropertyBasedElementPtr element)
   {
     CanvasPtr canvas = boost::static_pointer_cast<Canvas>(element);
-    canvas->setSystemAdapter(_system_adapter);
     canvas->setCanvasMgr(this);
   }
 

simgear/canvas/CanvasMgr.hxx

@@ -34,12 +34,8 @@ namespace canvas
 
       /**
        * @param node            Root node of branch used to control canvasses
-       * @param system_adapter  Adapter for connecting between canvas and
-       *                        application framework
-       *
        */
-      CanvasMgr( SGPropertyNode_ptr node,
-                 SystemAdapterPtr system_adapter );
+      CanvasMgr(SGPropertyNode_ptr node);
 
       /**
        * Create a new canvas
@@ -65,8 +61,6 @@ namespace canvas
 
     protected:
 
-      SystemAdapterPtr _system_adapter;
-
       virtual void elementCreated(PropertyBasedElementPtr element);
   };
 

simgear/canvas/CanvasObjectPlacement.cxx

@@ -0,0 +1,244 @@
+// Canvas placement for placing a canvas texture onto osg objects.
+//
+// It also provides a SGPickCallback for passing mouse events to the canvas and
+// manages emissive lighting of the placed canvas.
+//
+// Copyright (C) 2013  Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+
+#include "Canvas.hxx"
+#include "CanvasObjectPlacement.hxx"
+#include "MouseEvent.hxx"
+
+#include <simgear/props/props.hxx>
+#include <simgear/scene/util/SGPickCallback.hxx>
+
+#include <osgGA/GUIEventAdapter>
+
+namespace simgear
+{
+namespace canvas
+{
+
+  /**
+   * Handle picking events on object with a canvas placed onto
+   */
+  class ObjectPickCallback:
+    public SGPickCallback
+  {
+    public:
+
+      ObjectPickCallback(const CanvasWeakPtr& canvas):
+        _canvas(canvas)
+      {}
+
+      virtual bool needsUV() const { return true; }
+
+      virtual bool buttonPressed( int,
+                                  const osgGA::GUIEventAdapter& ea,
+                                  const Info& info )
+      {
+        MouseEventPtr event(new MouseEvent(ea));
+        updatePosFromUV(event, info.uv);
+
+        if( ea.getEventType() == osgGA::GUIEventAdapter::SCROLL )
+        {
+          event->type = Event::WHEEL;
+          event->delta.set(0,0);
+          switch( ea.getScrollingMotion() )
+          {
+            case osgGA::GUIEventAdapter::SCROLL_UP:
+              event->delta.y() = 1;
+              break;
+            case osgGA::GUIEventAdapter::SCROLL_DOWN:
+              event->delta.y() = -1;
+              break;
+            default:
+              return false;
+          }
+        }
+        else
+        {
+          event->type = Event::MOUSE_DOWN;
+        }
+
+        return handleEvent(event);
+      }
+
+      virtual void buttonReleased( int,
+                                   const osgGA::GUIEventAdapter& ea,
+                                   const Info* info )
+      {
+        if( ea.getEventType() != osgGA::GUIEventAdapter::RELEASE )
+          return;
+
+        MouseEventPtr event(new MouseEvent(ea));
+        event->type = Event::MOUSE_UP;
+        updatePosFromUV(event, info ? info->uv : SGVec2d(-1,-1));
+
+        handleEvent(event);
+      }
+
+      virtual void mouseMoved( const osgGA::GUIEventAdapter& ea,
+                               const Info* info )
+      {
+        // drag (currently only with LMB)
+        if( ea.getEventType() != osgGA::GUIEventAdapter::DRAG )
+          return;
+
+        MouseEventPtr event(new MouseEvent(ea));
+        event->type = Event::DRAG;
+        updatePosFromUV(event, info ? info->uv : SGVec2d(-1,-1));
+
+        handleEvent(event);
+      }
+
+      virtual bool hover( const osg::Vec2d& windowPos,
+                          const Info& info )
+      {
+        // TODO somehow get more info about event (time, modifiers, pressed
+        // buttons, ...)
+        MouseEventPtr event(new MouseEvent);
+        event->type = Event::MOUSE_MOVE;
+        event->screen_pos = windowPos;
+        updatePosFromUV(event, info.uv);
+
+        return handleEvent(event);
+      }
+
+      virtual void mouseLeave( const osg::Vec2d& windowPos )
+      {
+        MouseEventPtr event(new MouseEvent);
+        event->type = Event::MOUSE_LEAVE;
+        event->screen_pos = windowPos;
+
+        handleEvent(event);
+      }
+
+    protected:
+      CanvasWeakPtr _canvas;
+      osg::Vec2f    _last_pos,
+                    _last_delta;
+
+      void updatePosFromUV(const MouseEventPtr& event, const SGVec2d& uv)
+      {
+        CanvasPtr canvas = _canvas.lock();
+        if( !canvas )
+          return;
+
+        osg::Vec2d pos( uv.x() * canvas->getViewWidth(),
+                        (1 - uv.y()) * canvas->getViewHeight() );
+
+        _last_delta = pos - _last_pos;
+        _last_pos = pos;
+
+        event->client_pos = pos;
+        event->delta = _last_delta;
+      }
+
+      bool handleEvent(const MouseEventPtr& event)
+      {
+        CanvasPtr canvas = _canvas.lock();
+        if( !canvas )
+          return false;
+
+        return canvas->handleMouseEvent(event);
+      }
+  };
+
+  //----------------------------------------------------------------------------
+  ObjectPlacement::ObjectPlacement( SGPropertyNode* node,
+                                    const GroupPtr& group,
+                                    const CanvasWeakPtr& canvas ):
+    Placement(node),
+    _group(group),
+    _canvas(canvas)
+  {
+    // TODO make more generic and extendable for more properties
+    if( node->hasValue("emission") )
+      setEmission( node->getFloatValue("emission") );
+    if( node->hasValue("capture-events") )
+      setCaptureEvents( node->getBoolValue("capture-events") );
+  }
+
+  //----------------------------------------------------------------------------
+  ObjectPlacement::~ObjectPlacement()
+  {
+    assert( _group->getNumChildren() == 1 );
+    osg::Node *child = _group->getChild(0);
+
+    if( _group->getNumParents() )
+    {
+      osg::Group *parent = _group->getParent(0);
+      parent->addChild(child);
+      parent->removeChild(_group);
+    }
+
+    _group->removeChild(child);
+  }
+
+  //----------------------------------------------------------------------------
+  void ObjectPlacement::setEmission(float emit)
+  {
+    emit = SGMiscf::clip(emit, 0, 1);
+
+    if( !_material )
+    {
+      _material = new osg::Material;
+      _material->setColorMode(osg::Material::OFF);
+      _material->setDataVariance(osg::Object::DYNAMIC);
+      _group->getOrCreateStateSet()
+            ->setAttribute(_material, ( osg::StateAttribute::ON
+                                      | osg::StateAttribute::OVERRIDE ) );
+    }
+
+    _material->setEmission(
+      osg::Material::FRONT_AND_BACK,
+      osg::Vec4(emit, emit, emit, emit)
+    );
+  }
+
+  //----------------------------------------------------------------------------
+  void ObjectPlacement::setCaptureEvents(bool enable)
+  {
+    if( !enable && _scene_user_data )
+      return;
+
+    if( enable && !_pick_cb )
+      _pick_cb = new ObjectPickCallback(_canvas);
+
+    _scene_user_data = SGSceneUserData::getOrCreateSceneUserData(_group);
+    _scene_user_data->setPickCallback(enable ? _pick_cb.get() : 0);
+  }
+
+  //----------------------------------------------------------------------------
+  bool ObjectPlacement::childChanged(SGPropertyNode* node)
+  {
+    if( node->getParent() != _node )
+      return false;
+
+    if( node->getNameString() == "emission" )
+      setEmission( node->getFloatValue() );
+    else if( node->getNameString() == "capture-events" )
+      setCaptureEvents( node->getBoolValue() );
+    else
+      return false;
+
+    return true;
+  }
+
+} // namespace canvas
+} // namespace simgear

simgear/canvas/CanvasObjectPlacement.hxx

@@ -0,0 +1,75 @@
+// Canvas placement for placing a canvas texture onto osg objects.
+//
+// It also provides a SGPickCallback for passing mouse events to the canvas and
+// manages emissive lighting of the placed canvas.
+//
+// Copyright (C) 2013  Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+
+#ifndef CANVAS_PICK_PLACEMENT_HXX_
+#define CANVAS_OBJECT_PLACEMENT_HXX_
+
+#include "CanvasPlacement.hxx"
+#include "canvas_fwd.hxx"
+
+#include <simgear/scene/util/SGSceneUserData.hxx>
+#include <osg/Material>
+
+namespace simgear
+{
+namespace canvas
+{
+
+  class ObjectPlacement:
+    public Placement
+  {
+    public:
+
+      typedef osg::ref_ptr<osg::Group> GroupPtr;
+      typedef osg::ref_ptr<osg::Material> MaterialPtr;
+
+      ObjectPlacement( SGPropertyNode* node,
+                       const GroupPtr& group,
+                       const CanvasWeakPtr& canvas );
+      virtual ~ObjectPlacement();
+
+      /**
+       * Set emissive lighting of the object the canvas is placed on.
+       */
+      void setEmission(float emit);
+
+      /**
+       * Set whether pick events should be captured.
+       */
+      void setCaptureEvents(bool enable);
+
+      virtual bool childChanged(SGPropertyNode* child);
+
+    protected:
+      typedef SGSharedPtr<SGPickCallback> PickCallbackPtr;
+      typedef osg::ref_ptr<SGSceneUserData> SGSceneUserDataPtr;
+
+      GroupPtr            _group;
+      MaterialPtr         _material;
+      CanvasWeakPtr       _canvas;
+      PickCallbackPtr     _pick_cb;
+      SGSceneUserDataPtr  _scene_user_data;
+  };
+
+} // namespace canvas
+} // namespace simgear
+
+#endif /* CANVAS_PICK_PLACEMENT_HXX_ */

simgear/canvas/CanvasSystemAdapter.hxx

@@ -20,7 +20,6 @@
 #define SG_CANVAS_SYSTEM_ADAPTER_HXX_
 
 #include "canvas_fwd.hxx"
-#include <simgear/nasal/nasal.h>
 
 namespace simgear
 {
@@ -36,29 +35,6 @@ namespace canvas
       virtual void addCamera(osg::Camera* camera) const = 0;
       virtual void removeCamera(osg::Camera* camera) const = 0;
       virtual osg::Image* getImage(const std::string& path) const = 0;
-
-      virtual naContext getNasalContext() const = 0;
-
-      /**
-       * Save passed reference to Nasal object from being deleted by the
-       * garbage collector.
-       */
-      virtual int gcSave(naRef r) = 0;
-
-      /**
-       * Release an object previously passed to ::gcSave to allow it being
-       * cleaned up by the garbage collector.
-       */
-      virtual void gcRelease(int key) = 0;
-
-      /**
-       * Call a Nasal function with the given environment and arguments.
-       */
-      virtual naRef callMethod( naRef code,
-                                naRef self,
-                                int argc,
-                                naRef* args,
-                                naRef locals ) = 0;
   };
 
 } // namespace canvas

simgear/canvas/MouseEvent.hxx

@@ -38,8 +38,18 @@ namespace canvas
         click_count(0)
       {}
 
+      MouseEvent(const osgGA::GUIEventAdapter& ea):
+        button(ea.getButton()),
+        state(ea.getButtonMask()),
+        mod(ea.getModKeyMask()),
+        click_count(0)
+      {
+        time = ea.getTime();
+      }
+
       osg::Vec2f getScreenPos() const { return screen_pos; }
       osg::Vec2f getClientPos() const { return client_pos; }
+      osg::Vec2f getLocalPos()  const { return  local_pos; }
       osg::Vec2f getDelta() const { return delta; }
 
       float getScreenX() const { return screen_pos.x(); }
@@ -48,6 +58,9 @@ namespace canvas
       float getClientX() const { return client_pos.x(); }
       float getClientY() const { return client_pos.y(); }
 
+      float getLocalX() const { return local_pos.x(); }
+      float getLocalY() const { return local_pos.y(); }
+
       float getDeltaX() const { return delta.x(); }
       float getDeltaY() const { return delta.y(); }
 
@@ -55,6 +68,7 @@ namespace canvas
 
       osg::Vec2f  screen_pos,   //<! Position in screen coordinates
                   client_pos,   //<! Position in window/canvas coordinates
+                  local_pos,    //<! Position in local/element coordinates
                   delta;
       int         button,       //<! Button for this event
                   state,        //<! Current button state

simgear/canvas/ODGauge.cxx

@@ -29,6 +29,7 @@
 #endif
 
 #include "ODGauge.hxx"
+#include "Canvas.hxx"
 #include "CanvasSystemAdapter.hxx"
 
 #include <simgear/debug/logstream.hxx>
@@ -43,6 +44,7 @@
 #include <osg/ShadeModel>
 #include <osg/StateSet>
 #include <osg/FrameBufferObject> // for GL_DEPTH_STENCIL_EXT on Windows
+#include <osgUtil/RenderBin>
 
 #include <cassert>
 
@@ -51,18 +53,67 @@ namespace simgear
 namespace canvas
 {
 
+  class PreOrderBin:
+    public osgUtil::RenderBin
+  {
+    public:
+
+      PreOrderBin()
+      {}
+      PreOrderBin( const RenderBin& rhs,
+                   const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY ):
+        RenderBin(rhs, copyop)
+      {}
+
+      virtual osg::Object* cloneType() const
+      {
+        return new PreOrderBin();
+      }
+      virtual osg::Object* clone(const osg::CopyOp& copyop) const
+      {
+        return new PreOrderBin(*this,copyop);
+      }
+      virtual bool isSameKindAs(const osg::Object* obj) const
+      {
+        return dynamic_cast<const PreOrderBin*>(obj) != 0L;
+      }
+      virtual const char* className() const
+      {
+        return "PreOrderBin";
+      }
+
+      virtual void sort()
+      {
+        // Do not sort to keep traversal order...
+      }
+  };
+
+#ifndef OSG_INIT_SINGLETON_PROXY
+  /**
+   * http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk/include/osg/Object
+   *
+   * Helper macro that creates a static proxy object to call singleton function
+   * on it's construction, ensuring that the singleton gets initialized at
+   * startup.
+   */
+#  define OSG_INIT_SINGLETON_PROXY(ProxyName, Func)\
+          static struct ProxyName{ ProxyName() { Func; } } s_##ProxyName;
+#endif
+
+  OSG_INIT_SINGLETON_PROXY(
+    PreOrderBinProxy,
+    (osgUtil::RenderBin::addRenderBinPrototype("PreOrderBin", new PreOrderBin))
+  );
+
   //----------------------------------------------------------------------------
   ODGauge::ODGauge():
     _size_x( -1 ),
     _size_y( -1 ),
     _view_width( -1 ),
     _view_height( -1 ),
-    _use_image_coords( false ),
-    _use_stencil( false ),
-    _use_mipmapping( false ),
+    _flags(0),
     _coverage_samples( 0 ),
-    _color_samples( 0 ),
-    rtAvailable( false )
+    _color_samples( 0 )
   {
 
   }
@@ -73,12 +124,6 @@ namespace canvas
     clear();
   }
 
-  //----------------------------------------------------------------------------
-  void ODGauge::setSystemAdapter(const SystemAdapterPtr& system_adapter)
-  {
-    _system_adapter = system_adapter;
-  }
-
   //----------------------------------------------------------------------------
   void ODGauge::setSize(int size_x, int size_y)
   {
@@ -101,42 +146,43 @@ namespace canvas
       updateCoordinateFrame();
   }
 
+  //----------------------------------------------------------------------------
+  osg::Vec2s ODGauge::getViewSize() const
+  {
+    return osg::Vec2s(_view_width, _view_height);
+  }
+
   //----------------------------------------------------------------------------
   void ODGauge::useImageCoords(bool use)
   {
-    if( use == _use_image_coords )
-      return;
-
-    _use_image_coords = use;
-
-    if( texture )
+    if( updateFlag(USE_IMAGE_COORDS, use) && texture )
       updateCoordinateFrame();
   }
 
   //----------------------------------------------------------------------------
   void ODGauge::useStencil(bool use)
   {
-    if( use == _use_stencil )
-      return;
-
-    _use_stencil = use;
-
-    if( texture )
+    if( updateFlag(USE_STENCIL, use) && texture )
       updateStencil();
   }
 
   //----------------------------------------------------------------------------
-  void ODGauge::setSampling( bool mipmapping,
-                               int coverage_samples,
-                               int color_samples )
+  void ODGauge::useAdditiveBlend(bool use)
   {
-    if(    _use_mipmapping == mipmapping
+    if( updateFlag(USE_ADDITIVE_BLEND, use) && camera )
+      updateBlendMode();
+  }
+
+  //----------------------------------------------------------------------------
+  void ODGauge::setSampling( bool mipmapping,
+                             int coverage_samples,
+                             int color_samples )
+  {
+    if(    !updateFlag(USE_MIPMAPPING, mipmapping)
         && _coverage_samples == coverage_samples
         && _color_samples == color_samples )
       return;
 
-    _use_mipmapping = mipmapping;
-
     if( color_samples > coverage_samples )
     {
       SG_LOG
@@ -162,9 +208,9 @@ namespace canvas
   }
 
   //----------------------------------------------------------------------------
-  bool ODGauge::serviceable(void)
+  bool ODGauge::serviceable() const
   {
-    return rtAvailable;
+    return _flags & AVAILABLE;
   }
 
   //----------------------------------------------------------------------------
@@ -196,26 +242,25 @@ namespace canvas
                             osg::PolygonMode::FILL ),
       osg::StateAttribute::ON );
     stateSet->setAttributeAndModes(
-      new osg::AlphaFunc(osg::AlphaFunc::GREATER, 0.0f),
+      new osg::AlphaFunc(osg::AlphaFunc::GREATER, 0.001f),
       osg::StateAttribute::ON );
     stateSet->setAttribute(new osg::ShadeModel(osg::ShadeModel::FLAT));
-    stateSet->setAttributeAndModes(
-      new osg::BlendFunc( osg::BlendFunc::SRC_ALPHA,
-                          osg::BlendFunc::ONE_MINUS_SRC_ALPHA),
-      osg::StateAttribute::ON );
+
     if( !texture )
     {
       texture = new osg::Texture2D;
+      texture->setResizeNonPowerOfTwoHint(false);
       texture->setTextureSize(_size_x, _size_y);
       texture->setInternalFormat(GL_RGBA);
     }
 
     updateSampling();
+    updateBlendMode();
 
-    if( _system_adapter )
-      _system_adapter->addCamera(camera.get());
+    if( Canvas::getSystemAdapter() )
+      Canvas::getSystemAdapter()->addCamera(camera.get());
 
-    rtAvailable = true;
+    _flags |= AVAILABLE;
   }
 
   //----------------------------------------------------------------------------
@@ -229,12 +274,22 @@ namespace canvas
   //----------------------------------------------------------------------------
   void ODGauge::clear()
   {
-    if( camera.valid() && _system_adapter )
-      _system_adapter->removeCamera(camera.get());
+    if( camera.valid() && Canvas::getSystemAdapter() )
+      Canvas::getSystemAdapter()->removeCamera(camera.get());
     camera.release();
     texture.release();
 
-    rtAvailable = false;
+    _flags &= ~AVAILABLE;
+  }
+
+  //----------------------------------------------------------------------------
+  bool ODGauge::updateFlag(Flags flag, bool enable)
+  {
+    if( bool(_flags & flag) == enable )
+      return false;
+
+    _flags ^= flag;
+    return true;
   }
 
   //----------------------------------------------------------------------------
@@ -249,7 +304,7 @@ namespace canvas
 
     camera->setViewport(0, 0, _size_x, _size_y);
 
-    if( _use_image_coords )
+    if( _flags & USE_IMAGE_COORDS )
       camera->setProjectionMatrix(
         osg::Matrix::ortho2D(0, _view_width, _view_height, 0)
       );
@@ -267,7 +322,7 @@ namespace canvas
 
     GLbitfield mask = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT;
 
-    if( _use_stencil)
+    if( _flags & USE_STENCIL )
     {
       camera->attach( osg::Camera::PACKED_DEPTH_STENCIL_BUFFER,
                        GL_DEPTH_STENCIL_EXT );
@@ -289,18 +344,36 @@ namespace canvas
 
     texture->setFilter(
       osg::Texture2D::MIN_FILTER,
-      _use_mipmapping ? osg::Texture2D::LINEAR_MIPMAP_LINEAR
-                      : osg::Texture2D::LINEAR
+      (_flags & USE_MIPMAPPING) ? osg::Texture2D::LINEAR_MIPMAP_LINEAR
+                                : osg::Texture2D::LINEAR
     );
     camera->attach(
       osg::Camera::COLOR_BUFFER,
       texture.get(),
       0, 0,
-      _use_mipmapping,
+      _flags & USE_MIPMAPPING,
       _coverage_samples,
       _color_samples
     );
   }
 
+  //----------------------------------------------------------------------------
+  void ODGauge::updateBlendMode()
+  {
+    assert( camera );
+
+    camera->getOrCreateStateSet()
+      ->setAttributeAndModes
+      (
+        (_flags & USE_ADDITIVE_BLEND)
+          ? new osg::BlendFunc( osg::BlendFunc::SRC_ALPHA,
+                                osg::BlendFunc::ONE_MINUS_SRC_ALPHA,
+                                osg::BlendFunc::ONE,
+                                osg::BlendFunc::ONE )
+          : new osg::BlendFunc( osg::BlendFunc::SRC_ALPHA,
+                                osg::BlendFunc::ONE_MINUS_SRC_ALPHA )
+      );
+  }
+
 } // namespace canvas
 } // namespace simgear

simgear/canvas/ODGauge.hxx

@@ -53,8 +53,6 @@ namespace canvas
       ODGauge();
       virtual ~ODGauge();
 
-      void setSystemAdapter(const SystemAdapterPtr& system_adapter);
-
       /**
        * Set the size of the render target.
        *
@@ -71,6 +69,8 @@ namespace canvas
        */
       void setViewSize(int width, int height = -1);
 
+      osg::Vec2s getViewSize() const;
+
       /**
        * DEPRECATED
        *
@@ -91,6 +91,12 @@ namespace canvas
        */
       void useStencil(bool use = true);
 
+      /**
+       * Enable/Disable additive alpha blending (Can improve results with
+       * transparent background)
+       */
+      void useAdditiveBlend(bool use = true);
+
       /**
        * Set sampling parameters for mipmapping and coverage sampling
        * antialiasing.
@@ -112,7 +118,7 @@ namespace canvas
        * Say if we can render to a texture.
        * @return true if rtt is available
        */
-      bool serviceable(void);
+      bool serviceable() const;
 
       /**
        * Get the OSG camera for drawing this gauge.
@@ -128,27 +134,35 @@ namespace canvas
 
     protected:
 
-      SystemAdapterPtr _system_adapter;
-
       int _size_x,
           _size_y,
           _view_width,
           _view_height;
-      bool _use_image_coords,
-           _use_stencil,
-           _use_mipmapping;
+
+      enum Flags
+      {
+        AVAILABLE           = 1,
+        USE_IMAGE_COORDS    = AVAILABLE << 1,
+        USE_STENCIL         = USE_IMAGE_COORDS << 1,
+        USE_MIPMAPPING      = USE_STENCIL << 1,
+        USE_ADDITIVE_BLEND  = USE_MIPMAPPING << 1
+      };
+
+      uint32_t _flags;
 
       // Multisampling parameters
       int  _coverage_samples,
            _color_samples;
 
-      bool rtAvailable;
       osg::ref_ptr<osg::Camera> camera;
       osg::ref_ptr<osg::Texture2D> texture;
 
+      bool updateFlag(Flags flag, bool enable);
+
       void updateCoordinateFrame();
       void updateStencil();
       void updateSampling();
+      void updateBlendMode();
 
   };
 

simgear/canvas/ShivaVG/include/vg/openvg.h

@@ -627,6 +627,7 @@ VG_API_CALL const VGubyte * vgGetString(VGStringID name);
 #define OVG_SH_blend_dst_atop         1
 
 VG_API_CALL VGboolean vgCreateContextSH(VGint width, VGint height);
+VG_API_CALL VGboolean vgHasContextSH();
 VG_API_CALL void vgResizeSurfaceSH(VGint width, VGint height);
 VG_API_CALL void vgDestroyContextSH(void);
 

simgear/canvas/ShivaVG/src/shContext.c

@@ -61,6 +61,11 @@ VG_API_CALL VGboolean vgCreateContextSH(VGint width, VGint height)
   return VG_TRUE;
 }
 
+VG_API_CALL VGboolean vgHasContextSH()
+{
+  return g_context != NULL;
+}
+
 VG_API_CALL void vgResizeSurfaceSH(VGint width, VGint height)
 {
   VG_GETCONTEXT(VG_NO_RETVAL);

simgear/canvas/canvas_fwd.hxx

@@ -51,7 +51,6 @@ namespace canvas
   SG_FWD_DECL(Text)
 
   SG_FWD_DECL(Event)
-  SG_FWD_DECL(EventListener)
   SG_FWD_DECL(MouseEvent)
   SG_FWD_DECL(Placement)
   SG_FWD_DECL(SystemAdapter)
@@ -73,6 +72,8 @@ namespace canvas
   typedef boost::function<Placements( SGPropertyNode*,
                                       CanvasPtr )> PlacementFactory;
 
+  typedef boost::function<void(const EventPtr&)> EventListener;
+
 } // namespace canvas
 } // namespace simgear
 

simgear/canvas/elements/CMakeLists.txt

@@ -6,7 +6,11 @@ set(HEADERS
   CanvasImage.hxx
   CanvasMap.hxx
   CanvasPath.hxx
-  CanvasText.hxx  
+  CanvasText.hxx
+)
+
+set(DETAIL_HEADERS
+  detail/add_segment_variadic.hxx
 )
 
 set(SOURCES
@@ -18,4 +22,5 @@ set(SOURCES
   CanvasText.cxx
 )
 
-simgear_scene_component(canvas-elements canvas/elements "${SOURCES}" "${HEADERS}")
+simgear_scene_component(canvas-elements canvas/elements "${SOURCES}" "${HEADERS}")
+simgear_component(canvas-elements/detail canvas/elements/detail "" "${DETAIL_HEADERS}")

simgear/canvas/elements/CanvasElement.cxx

@@ -17,10 +17,11 @@
 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
 
 #include "CanvasElement.hxx"
-#include <simgear/canvas/Canvas.hxx>
-#include <simgear/canvas/CanvasEventListener.hxx>
 #include <simgear/canvas/CanvasEventVisitor.hxx>
 #include <simgear/canvas/MouseEvent.hxx>
+#include <simgear/math/SGMisc.hxx>
+#include <simgear/misc/strutils.hxx>
+#include <simgear/scene/material/parseBlendFunc.hxx>
 
 #include <osg/Drawable>
 #include <osg/Geode>
@@ -28,11 +29,10 @@
 
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/foreach.hpp>
-#include <boost/lexical_cast.hpp>
 #include <boost/make_shared.hpp>
-#include <boost/tokenizer.hpp>
 
 #include <cassert>
+#include <cmath>
 #include <cstring>
 
 namespace simgear
@@ -41,20 +41,110 @@ namespace canvas
 {
   const std::string NAME_TRANSFORM = "tf";
 
-  //----------------------------------------------------------------------------
-  void Element::removeListener()
+  /**
+   * glScissor with coordinates relative to different reference frames.
+   */
+  class Element::RelativeScissor:
+    public osg::Scissor
   {
-    _node->removeChangeListener(this);
+    public:
+
+      ReferenceFrame    _coord_reference;
+      osg::Matrix       _parent_inverse;
+
+      RelativeScissor():
+        _coord_reference(GLOBAL)
+      {}
+
+      virtual void apply(osg::State& state) const
+      {
+        const osg::Viewport* vp = state.getCurrentViewport();
+        float w2 = 0.5 * vp->width(),
+              h2 = 0.5 * vp->height();
+
+        osg::Matrix model_view
+        (
+          w2, 0,  0, 0,
+          0,  h2, 0, 0,
+          0,  0,  1, 0,
+          w2, h2, 0, 1
+        );
+        model_view.preMult(state.getProjectionMatrix());
+
+        if( _coord_reference != GLOBAL )
+        {
+          model_view.preMult(state.getModelViewMatrix());
+
+          if( _coord_reference == PARENT )
+            model_view.preMult(_parent_inverse);
+        }
+
+        const osg::Vec2 scale( model_view(0,0), model_view(1,1)),
+                        offset(model_view(3,0), model_view(3,1));
+
+        // TODO check/warn for rotation?
+
+        GLint x = SGMiscf::roundToInt(scale.x() * _x + offset.x()),
+              y = SGMiscf::roundToInt(scale.y() * _y + offset.y()),
+              w = SGMiscf::roundToInt(std::fabs(scale.x()) * _width),
+              h = SGMiscf::roundToInt(std::fabs(scale.y()) * _height);
+
+        if( scale.x() < 0 )
+          x -= w;
+        if( scale.y() < 0 )
+          y -= h;
+
+        glScissor(x, y, w, h);
+      }
+  };
+
+  //----------------------------------------------------------------------------
+  Element::OSGUserData::OSGUserData(ElementPtr element):
+    element(element)
+  {
+
   }
 
   //----------------------------------------------------------------------------
   Element::~Element()
   {
-    removeListener();
+    if( !_transform.valid() )
+      return;
 
+    for(unsigned int i = 0; i < _transform->getNumChildren(); ++i)
+    {
+      OSGUserData* ud =
+        static_cast<OSGUserData*>(_transform->getChild(i)->getUserData());
+
+      if( ud )
+        // Ensure parent is cleared to prevent accessing released memory if an
+        // element somehow survives longer than his parent.
+        ud->element->_parent = 0;
+    }
+  }
+
+  //----------------------------------------------------------------------------
+  void Element::setSelf(const PropertyBasedElementPtr& self)
+  {
+    PropertyBasedElement::setSelf(self);
+
+    _transform->setUserData
+    (
+      new OSGUserData(boost::static_pointer_cast<Element>(self))
+    );
+  }
+
+  //----------------------------------------------------------------------------
+  void Element::onDestroy()
+  {
+    if( !_transform.valid() )
+      return;
+
+    // The transform node keeps a reference on this element, so ensure it is
+    // deleted.
     BOOST_FOREACH(osg::Group* parent, _transform->getParents())
     {
-      parent->removeChild(_transform);
+      parent->removeChild(_transform.get());
     }
   }
 
@@ -64,6 +154,12 @@ namespace canvas
     return boost::static_pointer_cast<Element>(_self.lock());
   }
 
+  //----------------------------------------------------------------------------
+  ElementPtr Element::getParent()
+  {
+    return _parent ? _parent->getWeakPtr().lock() : ElementPtr();
+  }
+
   //----------------------------------------------------------------------------
   void Element::update(double dt)
   {
@@ -129,40 +225,73 @@ namespace canvas
       }
       _transform->setMatrix(m);
       _transform_dirty = false;
+      _attributes_dirty |= SCISSOR_COORDS;
+    }
+
+    if( _attributes_dirty & SCISSOR_COORDS )
+    {
+      if( _scissor && _scissor->_coord_reference != GLOBAL )
+        _scissor->_parent_inverse = _transform->getInverseMatrix();
+
+      _attributes_dirty &= ~SCISSOR_COORDS;
+    }
+
+    // Update bounding box on manual update (manual updates pass zero dt)
+    if( dt == 0 && _drawable )
+      _drawable->getBound();
+
+    if( _attributes_dirty & BLEND_FUNC )
+    {
+      parseBlendFunc(
+        _transform->getOrCreateStateSet(),
+        _node->getChild("blend-source"),
+        _node->getChild("blend-destination"),
+        _node->getChild("blend-source-rgb"),
+        _node->getChild("blend-destination-rgb"),
+        _node->getChild("blend-source-alpha"),
+        _node->getChild("blend-destination-alpha")
+      );
+      _attributes_dirty &= ~BLEND_FUNC;
     }
   }
 
   //----------------------------------------------------------------------------
-  naRef Element::addEventListener(const nasal::CallContext& ctx)
+  bool Element::addEventListener( const std::string& type_str,
+                                  const EventListener& cb )
   {
-    const std::string type_str = ctx.requireArg<std::string>(0);
-    naRef code = ctx.requireArg<naRef>(1);
-
     SG_LOG
     (
-      SG_NASAL,
+      SG_GENERAL,
       SG_INFO,
       "addEventListener(" << _node->getPath() << ", " << type_str << ")"
     );
 
     Event::Type type = Event::strToType(type_str);
     if( type == Event::UNKNOWN )
-      naRuntimeError( ctx.c,
-                      "addEventListener: Unknown event type %s",
-                      type_str.c_str() );
+    {
+      SG_LOG( SG_GENERAL,
+              SG_WARN,
+              "addEventListener: Unknown event type " << type_str );
+      return false;
+    }
 
-    _listener[ type ].push_back
-    (
-      boost::make_shared<EventListener>( code,
-                                         _canvas.lock()->getSystemAdapter() )
-    );
+    _listener[ type ].push_back(cb);
 
-    return naNil();
+    return true;
+  }
+
+  //----------------------------------------------------------------------------
+  void Element::clearEventListener()
+  {
+    _listener.clear();
   }
 
   //----------------------------------------------------------------------------
   bool Element::accept(EventVisitor& visitor)
   {
+    if( !isVisible() )
+      return false;
+
     return visitor.apply(*this);
   }
 
@@ -181,14 +310,16 @@ namespace canvas
   }
 
   //----------------------------------------------------------------------------
-  void Element::callListeners(const canvas::EventPtr& event)
+  bool Element::handleEvent(canvas::EventPtr event)
   {
     ListenerMap::iterator listeners = _listener.find(event->getType());
     if( listeners == _listener.end() )
-      return;
+      return false;
 
-    BOOST_FOREACH(EventListenerPtr listener, listeners->second)
-      listener->call(event);
+    BOOST_FOREACH(EventListener const& listener, listeners->second)
+      listener(event);
+
+    return true;
   }
 
   //----------------------------------------------------------------------------
@@ -199,21 +330,28 @@ namespace canvas
 
     // Drawables have a bounding box...
     if( _drawable )
-    {
-      if( !_drawable->getBound().contains(osg::Vec3f(local_pos, 0)) )
-        return false;
-    }
+      return _drawable->getBound().contains(osg::Vec3f(local_pos, 0));
     // ... for other elements, i.e. groups only a bounding sphere is available
-    else if( !_transform->getBound().contains(osg::Vec3f(pos, 0)) )
-        return false;
-
-    return true;
+    else
+      return _transform->getBound().contains(osg::Vec3f(pos, 0));
   }
 
   //----------------------------------------------------------------------------
-  osg::ref_ptr<osg::MatrixTransform> Element::getMatrixTransform()
+  bool Element::isVisible() const
   {
-    return _transform;
+    return _transform.valid() && _transform->getNodeMask() != 0;
+  }
+
+  //----------------------------------------------------------------------------
+  osg::MatrixTransform* Element::getMatrixTransform()
+  {
+    return _transform.get();
+  }
+
+  //----------------------------------------------------------------------------
+  osg::MatrixTransform const* Element::getMatrixTransform() const
+  {
+    return _transform.get();
   }
 
   //----------------------------------------------------------------------------
@@ -257,26 +395,37 @@ namespace canvas
   //----------------------------------------------------------------------------
   void Element::childRemoved(SGPropertyNode* parent, SGPropertyNode* child)
   {
-    if( parent == _node && child->getNameString() == NAME_TRANSFORM )
+    if( parent == _node )
     {
-      if( child->getIndex() >= static_cast<int>(_transform_types.size()) )
+      if( child->getNameString() == NAME_TRANSFORM )
       {
-        SG_LOG
-        (
-          SG_GENERAL,
-          SG_WARN,
-          "Element::childRemoved: unknown transform: " << child->getPath()
-        );
+        if( !_transform.valid() )
+          return;
+
+        if( child->getIndex() >= static_cast<int>(_transform_types.size()) )
+        {
+          SG_LOG
+          (
+            SG_GENERAL,
+            SG_WARN,
+            "Element::childRemoved: unknown transform: " << child->getPath()
+          );
+          return;
+        }
+
+        _transform_types[ child->getIndex() ] = TT_NONE;
+
+        while( !_transform_types.empty() && _transform_types.back() == TT_NONE )
+          _transform_types.pop_back();
+
+        _transform_dirty = true;
         return;
       }
-
-      _transform_types[ child->getIndex() ] = TT_NONE;
-
-      while( !_transform_types.empty() && _transform_types.back() == TT_NONE )
-        _transform_types.pop_back();
-
-      _transform_dirty = true;
-      return;
+      else if( StyleInfo const* style = getStyleInfo(child->getNameString()) )
+      {
+        if( setStyle(getParentStyle(child), style) )
+          return;
+      }
     }
 
     childRemoved(child);
@@ -288,13 +437,25 @@ namespace canvas
     SGPropertyNode *parent = child->getParent();
     if( parent == _node )
     {
-      if( setStyle(child) )
+      const std::string& name = child->getNameString();
+      if( StyleInfo const* style_info = getStyleInfo(name) )
+      {
+        SGPropertyNode const* style = child;
+        if( isStyleEmpty(child) )
+        {
+          child->clearValue();
+          style = getParentStyle(child);
+        }
+        setStyle(style, style_info);
         return;
-      else if( child->getNameString() == "update" )
+      }
+      else if( name == "update" )
         return update(0);
-      else if( child->getNameString() == "visible" )
+      else if( name == "visible" )
         // TODO check if we need another nodemask
         return _transform->setNodeMask( child->getBoolValue() ? 0xffffffff : 0 );
+      else if( boost::starts_with(name, "blend-") )
+        return (void)(_attributes_dirty |= BLEND_FUNC);
     }
     else if(   parent->getParent() == _node
             && parent->getNameString() == NAME_TRANSFORM )
@@ -307,15 +468,10 @@ namespace canvas
   }
 
   //----------------------------------------------------------------------------
-  bool Element::setStyle(const SGPropertyNode* child)
+  bool Element::setStyle( const SGPropertyNode* child,
+                          const StyleInfo* style_info )
   {
-    StyleSetters::const_iterator setter =
-      _style_setters.find(child->getNameString());
-    if( setter == _style_setters.end() )
-      return false;
-
-    setter->second(child);
-    return true;
+    return canApplyStyle(child) && setStyleImpl(child, style_info);
   }
 
   //----------------------------------------------------------------------------
@@ -324,6 +480,7 @@ namespace canvas
     if( clip.empty() || clip == "auto" )
     {
       getOrCreateStateSet()->removeAttribute(osg::StateAttribute::SCISSOR);
+      _scissor = 0;
       return;
     }
 
@@ -336,17 +493,22 @@ namespace canvas
       return;
     }
 
-    typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
-    const boost::char_separator<char> del(", \t\npx");
-
-    tokenizer tokens(clip.begin() + RECT.size(), clip.end() - 1, del);
+    const std::string sep(", \t\npx");
     int comp = 0;
-    int values[4];
-    for( tokenizer::const_iterator tok = tokens.begin();
-         tok != tokens.end() && comp < 4;
-         ++tok, ++comp )
+    float values[4];
+
+    for(size_t pos = RECT.size(); comp < 4; ++comp)
     {
-      values[comp] = boost::lexical_cast<int>(*tok);
+      pos = clip.find_first_not_of(sep, pos);
+      if( pos == std::string::npos || pos == clip.size() - 1 )
+        break;
+
+      char *end = 0;
+      values[comp] = strtod(&clip[pos], &end);
+      if( end == &clip[pos] || !end )
+        break;
+
+      pos = end - &clip[0];
     }
 
     if( comp < 4 )
@@ -355,32 +517,37 @@ namespace canvas
       return;
     }
 
-    float scale_x = 1,
-          scale_y = 1;
+    float width = values[1] - values[3],
+          height = values[2] - values[0];
 
-    CanvasPtr canvas = _canvas.lock();
-    if( canvas )
+    if( width < 0 || height < 0 )
     {
-      // The scissor rectangle isn't affected by any transformation, so we need
-      // to convert to image/canvas coordinates on our selves.
-      scale_x = canvas->getSizeX()
-              / static_cast<float>(canvas->getViewWidth());
-      scale_y = canvas->getSizeY()
-              / static_cast<float>(canvas->getViewHeight());
+      SG_LOG(SG_GENERAL, SG_WARN, "Canvas: negative clip size: " << clip);
+      return;
     }
 
-    osg::Scissor* scissor = new osg::Scissor();
+    _scissor = new RelativeScissor();
     // <top>, <right>, <bottom>, <left>
-    scissor->x() = scale_x * values[3];
-    scissor->y() = scale_y * values[0];
-    scissor->width() = scale_x * (values[1] - values[3]);
-    scissor->height() = scale_y * (values[2] - values[0]);
+    _scissor->x() = SGMiscf::roundToInt(values[3]);
+    _scissor->y() = SGMiscf::roundToInt(values[0]);
+    _scissor->width() = SGMiscf::roundToInt(width);
+    _scissor->height() = SGMiscf::roundToInt(height);
 
-    if( canvas )
-      // Canvas has y axis upside down
-      scissor->y() = canvas->getSizeY() - scissor->y() - scissor->height();
+    getOrCreateStateSet()->setAttributeAndModes(_scissor);
 
-    getOrCreateStateSet()->setAttributeAndModes(scissor);
+    SGPropertyNode* clip_frame = _node->getChild("clip-frame", 0);
+    if( clip_frame )
+      valueChanged(clip_frame);
+  }
+
+  //----------------------------------------------------------------------------
+  void Element::setClipFrame(ReferenceFrame rf)
+  {
+    if( _scissor )
+    {
+      _scissor->_coord_reference = rf;
+      _attributes_dirty |= SCISSOR_COORDS;
+    }
   }
 
   //----------------------------------------------------------------------------
@@ -411,11 +578,14 @@ namespace canvas
     osg::BoundingBox transformed;
     const osg::BoundingBox& bb = _drawable->getBound();
     for(int i = 0; i < 4; ++i)
-      transformed.expandBy( m * bb.corner(i) );
+      transformed.expandBy( bb.corner(i) * m );
 
     return transformed;
   }
 
+  //----------------------------------------------------------------------------
+  Element::StyleSetters Element::_style_setters;
+
   //----------------------------------------------------------------------------
   Element::Element( const CanvasWeakPtr& canvas,
                     const SGPropertyNode_ptr& node,
@@ -424,11 +594,15 @@ namespace canvas
     PropertyBasedElement(node),
     _canvas( canvas ),
     _parent( parent ),
+    _attributes_dirty( 0 ),
     _transform_dirty( false ),
     _transform( new osg::MatrixTransform ),
     _style( parent_style ),
+    _scissor( 0 ),
     _drawable( 0 )
   {
+    staticInit();
+
     SG_LOG
     (
       SG_GL,
@@ -436,7 +610,93 @@ namespace canvas
       "New canvas element " << node->getPath()
     );
 
-    addStyle("clip", &Element::setClip, this);
+    // Ensure elements are drawn in order they appear in the element tree
+    _transform->getOrCreateStateSet()
+              ->setRenderBinDetails
+              (
+                0,
+                "PreOrderBin",
+                osg::StateSet::OVERRIDE_RENDERBIN_DETAILS
+              );
+  }
+
+  //----------------------------------------------------------------------------
+  void Element::staticInit()
+  {
+    if( isInit<Element>() )
+      return;
+
+    addStyle("clip", "", &Element::setClip, false);
+    addStyle("clip-frame", "", &Element::setClipFrame, false);
+  }
+
+  //----------------------------------------------------------------------------
+  bool Element::isStyleEmpty(const SGPropertyNode* child) const
+  {
+    return !child
+        || simgear::strutils::strip(child->getStringValue()).empty();
+  }
+
+  //----------------------------------------------------------------------------
+  bool Element::canApplyStyle(const SGPropertyNode* child) const
+  {
+    if( _node == child->getParent() )
+      return true;
+
+    // Parent values do not override if element has own value
+    return isStyleEmpty( _node->getChild(child->getName()) );
+  }
+
+  //----------------------------------------------------------------------------
+  bool Element::setStyleImpl( const SGPropertyNode* child,
+                              const StyleInfo* style_info )
+  {
+    const StyleSetter* style_setter = style_info
+                                    ? &style_info->setter
+                                    : getStyleSetter(child->getNameString());
+    while( style_setter )
+    {
+      if( style_setter->func(*this, child) )
+        return true;
+      style_setter = style_setter->next;
+    }
+    return false;
+  }
+
+  //----------------------------------------------------------------------------
+  const Element::StyleInfo*
+  Element::getStyleInfo(const std::string& name) const
+  {
+    StyleSetters::const_iterator setter = _style_setters.find(name);
+    if( setter == _style_setters.end() )
+      return 0;
+
+    return &setter->second;
+  }
+
+  //----------------------------------------------------------------------------
+  const Element::StyleSetter*
+  Element::getStyleSetter(const std::string& name) const
+  {
+    const StyleInfo* info = getStyleInfo(name);
+    return info ? &info->setter : 0;
+  }
+
+  //----------------------------------------------------------------------------
+  const SGPropertyNode*
+  Element::getParentStyle(const SGPropertyNode* child) const
+  {
+    // Try to get value from parent...
+    if( _parent )
+    {
+      Style::const_iterator style =
+        _parent->_style.find(child->getNameString());
+      if( style != _parent->_style.end() )
+        return style->second;
+    }
+
+    // ...or reset to default if none is available
+    return child; // TODO somehow get default value for each style?
   }
 
   //----------------------------------------------------------------------------

simgear/canvas/elements/CanvasElement.hxx

@@ -23,13 +23,13 @@
 #include <simgear/canvas/CanvasEvent.hxx>
 #include <simgear/props/PropertyBasedElement.hxx>
 #include <simgear/misc/stdint.hxx> // for uint32_t
-#include <simgear/nasal/cppbind/Ghost.hxx>
 
 #include <osg/BoundingBox>
 #include <osg/MatrixTransform>
 
 #include <boost/bind.hpp>
 #include <boost/function.hpp>
+#include <boost/type_traits/is_base_of.hpp>
 
 namespace osg
 {
@@ -45,24 +45,57 @@ namespace canvas
     public PropertyBasedElement
   {
     public:
-      typedef boost::function<void(const SGPropertyNode*)> StyleSetter;
-      typedef std::map<std::string, StyleSetter> StyleSetters;
 
       /**
-       * Remove the property listener of the element.
-       *
-       * You will need to call the appropriate methods (#childAdded,
-       * #childRemoved, #valueChanged) yourself to ensure the element still
-       * receives the needed events.
+       * Store pointer to window as user data
        */
-      void removeListener();
+      class OSGUserData:
+        public osg::Referenced
+      {
+        public:
+          ElementPtr element;
+          OSGUserData(ElementPtr element);
+      };
+
+      typedef boost::function<bool(Element&, const SGPropertyNode*)>
+              StyleSetterFunc;
+      typedef boost::function<void(Element&, const SGPropertyNode*)>
+              StyleSetterFuncUnchecked;
+      struct StyleSetter:
+        public SGReferenced
+      {
+        StyleSetterFunc func;
+        SGSharedPtr<StyleSetter> next;
+      };
+      struct StyleInfo
+      {
+        StyleSetter setter; ///!< Function(s) for setting this style
+        std::string type;   ///!< Interpolation type
+        bool inheritable;   ///!< Whether children can inherit this style from
+                            ///   their parents
+      };
+
+      /**
+       * Coordinate reference frame (eg. "clip" property)
+       */
+      enum ReferenceFrame
+      {
+        GLOBAL, ///!< Global coordinates
+        PARENT, ///!< Coordinates relative to parent coordinate frame
+        LOCAL   ///!< Coordinates relative to local coordinates (parent
+                ///   coordinates with local transformations applied)
+      };
 
       /**
        *
        */
       virtual ~Element() = 0;
 
+      virtual void setSelf(const PropertyBasedElementPtr& self);
+      virtual void onDestroy();
+
       ElementWeakPtr getWeakPtr() const;
+      ElementPtr getParent();
 
       /**
        * Called every frame to update internal state
@@ -71,19 +104,26 @@ namespace canvas
        */
       virtual void update(double dt);
 
-      naRef addEventListener(const nasal::CallContext& ctx);
+      bool addEventListener(const std::string& type, const EventListener& cb);
+      virtual void clearEventListener();
 
       virtual bool accept(EventVisitor& visitor);
       virtual bool ascend(EventVisitor& visitor);
       virtual bool traverse(EventVisitor& visitor);
 
-      void callListeners(const canvas::EventPtr& event);
+      virtual bool handleEvent(canvas::EventPtr event);
 
       virtual bool hitBound( const osg::Vec2f& pos,
                              const osg::Vec2f& local_pos ) const;
 
+      /**
+       * Get whether the element is visible or hidden (Can be changed with
+       * setting property "visible" accordingly).
+       */
+      bool isVisible() const;
 
-      osg::ref_ptr<osg::MatrixTransform> getMatrixTransform();
+      osg::MatrixTransform* getMatrixTransform();
+      osg::MatrixTransform const* getMatrixTransform() const;
 
       virtual void childAdded( SGPropertyNode * parent,
                                SGPropertyNode * child );
@@ -91,7 +131,8 @@ namespace canvas
                                  SGPropertyNode * child );
       virtual void valueChanged(SGPropertyNode * child);
 
-      virtual bool setStyle(const SGPropertyNode* child);
+      virtual bool setStyle( const SGPropertyNode* child,
+                             const StyleInfo* style_info = 0 );
 
       /**
        * Set clipping shape
@@ -101,6 +142,11 @@ namespace canvas
        */
       void setClip(const std::string& clip);
 
+      /**
+       * Clipping coordinates reference frame
+       */
+      void setClipFrame(ReferenceFrame rf);
+
       /**
        * Write the given bounding box to the property tree
        */
@@ -111,11 +157,33 @@ namespace canvas
        */
       virtual osg::BoundingBox getTransformedBounds(const osg::Matrix& m) const;
 
+      /**
+       * Create an canvas Element
+       *
+       * @tparam Derived    Type of element (needs to derive from Element)
+       */
+      template<typename Derived>
+      static
+      typename boost::enable_if<
+        boost::is_base_of<Element, Derived>,
+        ElementPtr
+      >::type create( const CanvasWeakPtr& canvas,
+                      const SGPropertyNode_ptr& node,
+                      const Style& style,
+                      Element* parent )
+      {
+        ElementPtr el( new Derived(canvas, node, style, parent) );
+        el->setSelf(el);
+        return el;
+      }
+
     protected:
 
       enum Attributes
       {
-        LAST_ATTRIBUTE  = 0x0001
+        BLEND_FUNC      = 1,
+        SCISSOR_COORDS  = BLEND_FUNC << 1,
+        LAST_ATTRIBUTE  = SCISSOR_COORDS << 1
       };
 
       enum TransformType
@@ -127,64 +195,332 @@ namespace canvas
         TT_SCALE
       };
 
+      class RelativeScissor;
+
       CanvasWeakPtr _canvas;
       Element      *_parent;
 
       uint32_t _attributes_dirty;
 
       bool _transform_dirty;
-      osg::ref_ptr<osg::MatrixTransform>    _transform;
-      std::vector<TransformType>            _transform_types;
+      osg::observer_ptr<osg::MatrixTransform> _transform;
+      std::vector<TransformType>              _transform_types;
 
       Style                             _style;
-      StyleSetters                      _style_setters;
       std::vector<SGPropertyNode_ptr>   _bounding_box;
+      RelativeScissor                  *_scissor;
 
-      typedef std::vector<EventListenerPtr> Listener;
+      typedef std::vector<EventListener> Listener;
       typedef std::map<Event::Type, Listener> ListenerMap;
 
       ListenerMap _listener;
 
+      typedef std::map<std::string, StyleInfo> StyleSetters;
+      static StyleSetters       _style_setters;
+
+      static void staticInit();
+
       Element( const CanvasWeakPtr& canvas,
                const SGPropertyNode_ptr& node,
                const Style& parent_style,
                Element* parent );
 
-      template<typename T, class C1, class C2>
-      Element::StyleSetter
-      addStyle(const std::string& name, void (C1::*setter)(T), C2 instance)
+      /**
+       * Returns false on first call and true on any successive call. Use to
+       * perform initialization tasks which are only required once per element
+       * type.
+       *
+       * @tparam Derived    (Derived) class type
+       */
+      template<class Derived>
+      static bool isInit()
       {
-        return _style_setters[ name ] =
-                 bindStyleSetter<T>(name, setter, instance);
+        static bool is_init = false;
+        if( is_init )
+          return true;
+
+        is_init = true;
+        return false;
       }
 
-      template<typename T1, typename T2, class C1, class C2>
-      Element::StyleSetter
-      addStyle(const std::string& name, void (C1::*setter)(T2), C2 instance)
-      {
-        return _style_setters[ name ] =
-                 bindStyleSetter<T1>(name, setter, instance);
-      }
-
-      template<class C1, class C2>
-      Element::StyleSetter
+      /**
+       * Register a function for setting a style specified by the given property
+       *
+       * @param name    Property name
+       * @param type    Interpolation type
+       * @param setter  Setter function
+       *
+       * @tparam T1         Type of value used to retrieve value from property
+       *                    node
+       * @tparam T2         Type of value the setter function expects
+       * @tparam Derived    Type of class the setter can be applied to
+       *
+       * @note T1 needs to be convertible to T2
+       */
+      template<
+        typename T1,
+        typename T2,
+        class Derived
+      >
+      static
+      StyleSetter
       addStyle( const std::string& name,
-                void (C1::*setter)(const std::string&),
-                C2 instance )
+                const std::string& type,
+                const boost::function<void (Derived&, T2)>& setter,
+                bool inheritable = true )
       {
-        return _style_setters[ name ] =
-                 bindStyleSetter<const char*>(name, setter, instance);
+        StyleInfo& style_info = _style_setters[ name ];
+        if( !type.empty() )
+        {
+          if( !style_info.type.empty() && type != style_info.type )
+            SG_LOG
+            (
+              SG_GENERAL,
+              SG_WARN,
+              "changing animation type for '" << name << "': "
+                << style_info.type << " -> " << type
+            );
+
+          style_info.type = type;
+        }
+        // TODO check if changed?
+        style_info.inheritable = inheritable;
+
+        StyleSetter* style = &style_info.setter;
+        while( style->next )
+          style = style->next;
+        if( style->func )
+          style = style->next = new StyleSetter;
+
+        style->func = boost::bind
+        (
+          &type_match<Derived>::call,
+          _1,
+          _2,
+          bindStyleSetter<T1>(name, setter)
+        );
+        return *style;
       }
 
-      template<typename T1, typename T2, class C1, class C2>
-      Element::StyleSetter
-      bindStyleSetter( const std::string& name,
-                       void (C1::*setter)(T2),
-                       C2 instance )
+      template<
+        typename T,
+        class Derived
+      >
+      static
+      StyleSetter
+      addStyle( const std::string& name,
+                const std::string& type,
+                const boost::function<void (Derived&, T)>& setter,
+                bool inheritable = true )
       {
-        return boost::bind(setter, instance, boost::bind(&getValue<T1>, _1));
+        return addStyle<T, T>(name, type, setter, inheritable);
       }
 
+      template<
+        typename T,
+        class Derived
+      >
+      static
+      StyleSetter
+      addStyle( const std::string& name,
+                const std::string& type,
+                void (Derived::*setter)(T),
+                bool inheritable = true )
+      {
+        return addStyle<T, T>
+        (
+          name,
+          type,
+          boost::function<void (Derived&, T)>(setter),
+          inheritable
+        );
+      }
+
+      template<
+        typename T1,
+        typename T2,
+        class Derived
+      >
+      static
+      StyleSetterFunc
+      addStyle( const std::string& name,
+                const std::string& type,
+                void (Derived::*setter)(T2),
+                bool inheritable = true )
+      {
+        return addStyle<T1>
+        (
+          name,
+          type,
+          boost::function<void (Derived&, T2)>(setter),
+          inheritable
+        );
+      }
+
+      template<
+        class Derived
+      >
+      static
+      StyleSetter
+      addStyle( const std::string& name,
+                const std::string& type,
+                void (Derived::*setter)(const std::string&),
+                bool inheritable = true )
+      {
+        return addStyle<const char*, const std::string&>
+        (
+          name,
+          type,
+          boost::function<void (Derived&, const std::string&)>(setter),
+          inheritable
+        );
+      }
+
+      template<
+        typename T,
+        class Derived,
+        class Other,
+        class OtherRef
+      >
+      static
+      StyleSetter
+      addStyle( const std::string& name,
+                const std::string& type,
+                void (Other::*setter)(T),
+                OtherRef Derived::*instance_ref,
+                bool inheritable = true )
+      {
+        return addStyle<T, T>
+        (
+          name,
+          type,
+          bindOther(setter, instance_ref),
+          inheritable
+        );
+      }
+
+      template<
+        typename T1,
+        typename T2,
+        class Derived,
+        class Other,
+        class OtherRef
+      >
+      static
+      StyleSetter
+      addStyle( const std::string& name,
+                const std::string& type,
+                void (Other::*setter)(T2),
+                OtherRef Derived::*instance_ref,
+                bool inheritable = true )
+      {
+        return addStyle<T1>
+        (
+          name,
+          type,
+          bindOther(setter, instance_ref),
+          inheritable
+        );
+      }
+
+      template<
+        typename T1,
+        typename T2,
+        class Derived,
+        class Other,
+        class OtherRef
+      >
+      static
+      StyleSetter
+      addStyle( const std::string& name,
+                const std::string& type,
+                const boost::function<void (Other&, T2)>& setter,
+                OtherRef Derived::*instance_ref,
+                bool inheritable = true )
+      {
+        return addStyle<T1>
+        (
+          name,
+          type,
+          bindOther(setter, instance_ref),
+          inheritable
+        );
+      }
+
+      template<
+        class Derived,
+        class Other,
+        class OtherRef
+      >
+      static
+      StyleSetter
+      addStyle( const std::string& name,
+                const std::string& type,
+                void (Other::*setter)(const std::string&),
+                OtherRef Derived::*instance_ref,
+                bool inheritable = true )
+      {
+        return addStyle<const char*, const std::string&>
+        (
+          name,
+          type,
+          boost::function<void (Other&, const std::string&)>(setter),
+          instance_ref,
+          inheritable
+        );
+      }
+
+      template<typename T, class Derived, class Other, class OtherRef>
+      static
+      boost::function<void (Derived&, T)>
+      bindOther( void (Other::*setter)(T), OtherRef Derived::*instance_ref )
+      {
+        return boost::bind(setter, boost::bind(instance_ref, _1), _2);
+      }
+
+      template<typename T, class Derived, class Other, class OtherRef>
+      static
+      boost::function<void (Derived&, T)>
+      bindOther( const boost::function<void (Other&, T)>& setter,
+                 OtherRef Derived::*instance_ref )
+      {
+        return boost::bind
+        (
+          setter,
+          boost::bind
+          (
+            &reference_from_pointer<Other, OtherRef>,
+            boost::bind(instance_ref, _1)
+          ),
+          _2
+        );
+      }
+
+      template<typename T1, typename T2, class Derived>
+      static
+      StyleSetterFuncUnchecked
+      bindStyleSetter( const std::string& name,
+                       const boost::function<void (Derived&, T2)>& setter )
+      {
+        return boost::bind
+        (
+          setter,
+          // We will only call setters with Derived instances, so we can safely
+          // cast here.
+          boost::bind(&derived_cast<Derived>, _1),
+          boost::bind(&getValue<T1>, _2)
+        );
+      }
+
+      bool isStyleEmpty(const SGPropertyNode* child) const;
+      bool canApplyStyle(const SGPropertyNode* child) const;
+      bool setStyleImpl( const SGPropertyNode* child,
+                         const StyleInfo* style_info = 0 );
+
+      const StyleInfo* getStyleInfo(const std::string& name) const;
+      const StyleSetter* getStyleSetter(const std::string& name) const;
+      const SGPropertyNode* getParentStyle(const SGPropertyNode* child) const;
+
       virtual void childAdded(SGPropertyNode * child)  {}
       virtual void childRemoved(SGPropertyNode * child){}
       virtual void childChanged(SGPropertyNode * child){}
@@ -203,9 +539,63 @@ namespace canvas
       osg::ref_ptr<osg::Drawable> _drawable;
 
       Element(const Element&);// = delete
+
+      template<class Derived>
+      static Derived& derived_cast(Element& el)
+      {
+        return static_cast<Derived&>(el);
+      }
+
+      template<class T, class SharedPtr>
+      static T& reference_from_pointer(const SharedPtr& p)
+      {
+        return *get_pointer(p);
+      }
+
+      /**
+       * Helper to call a function only of the element type can be converted to
+       * the required type.
+       *
+       * @return Whether the function has been called
+       */
+      template<class Derived>
+      struct type_match
+      {
+        static bool call( Element& el,
+                          const SGPropertyNode* prop,
+                          const StyleSetterFuncUnchecked& func )
+        {
+          Derived* d = dynamic_cast<Derived*>(&el);
+          if( !d )
+            return false;
+          func(*d, prop);
+          return true;
+        }
+      };
   };
 
 } // namespace canvas
+
+  template<>
+  struct enum_traits<canvas::Element::ReferenceFrame>
+  {
+    static const char* name()
+    {
+      return "canvas::Element::ReferenceFrame";
+    }
+
+    static canvas::Element::ReferenceFrame defVal()
+    {
+      return canvas::Element::GLOBAL;
+    }
+
+    static bool validate(int frame)
+    {
+      return frame >= canvas::Element::GLOBAL
+          && frame <= canvas::Element::LOCAL;
+    }
+  };
+
 } // namespace simgear
 
 #endif /* CANVAS_ELEMENT_HXX_ */

simgear/canvas/elements/CanvasGroup.cxx

@@ -33,17 +33,37 @@ namespace simgear
 namespace canvas
 {
   /**
-   * Create an canvas Element of type T
+   * Add canvas Element type to factory map
    */
-  template<typename T>
-  ElementPtr createElement( const CanvasWeakPtr& canvas,
-                            const SGPropertyNode_ptr& node,
-                            const Style& style,
-                            Element* parent )
+  template<typename ElementType>
+  void add(ElementFactories& factories)
   {
-    ElementPtr el( new T(canvas, node, style, parent) );
-    el->setSelf(el);
-    return el;
+    ElementType::staticInit();
+    factories[ElementType::TYPE_NAME] = &Element::create<ElementType>;
+  }
+
+  //----------------------------------------------------------------------------
+  ElementFactories Group::_child_factories;
+  const std::string Group::TYPE_NAME = "group";
+
+  void warnTransformExpired(const char* member_name)
+  {
+    SG_LOG( SG_GENERAL,
+            SG_WARN,
+            "canvas::Group::" << member_name << ": Group has expired." );
+  }
+
+  //----------------------------------------------------------------------------
+  void Group::staticInit()
+  {
+    if( isInit<Group>() )
+      return;
+
+    add<Group>(_child_factories);
+    add<Image>(_child_factories);
+    add<Map  >(_child_factories);
+    add<Path >(_child_factories);
+    add<Text >(_child_factories);
   }
 
   //----------------------------------------------------------------------------
@@ -53,11 +73,7 @@ namespace canvas
                 Element* parent ):
     Element(canvas, node, parent_style, parent)
   {
-    _child_factories["group"] = &createElement<Group>;
-    _child_factories["image"] = &createElement<Image>;
-    _child_factories["map"  ] = &createElement<Map  >;
-    _child_factories["path" ] = &createElement<Path >;
-    _child_factories["text" ] = &createElement<Text >;
+    staticInit();
   }
 
   //----------------------------------------------------------------------------
@@ -80,22 +96,54 @@ namespace canvas
   //----------------------------------------------------------------------------
   ElementPtr Group::getChild(const SGPropertyNode* node)
   {
-    ChildList::iterator child = findChild(node);
-    if( child == _children.end() )
-      return ElementPtr();
+    return findChild(node, "");
+  }
 
-    return child->second;
+  //----------------------------------------------------------------------------
+  ElementPtr Group::getChild(const std::string& id)
+  {
+    return findChild(0, id);
+  }
+
+  //----------------------------------------------------------------------------
+  ElementPtr Group::getOrCreateChild( const std::string& type,
+                                      const std::string& id )
+  {
+    ElementPtr child = getChild(id);
+    if( child )
+    {
+      if( child->getProps()->getNameString() == type )
+        return child;
+
+      SG_LOG
+      (
+        SG_GENERAL,
+        SG_WARN,
+        "Group::getOrCreateChild: type missmatch! "
+        "('" << type << "' != '" << child->getProps()->getName() << "', "
+        "id = '" << id << "')"
+      );
+
+      return ElementPtr();
+    }
+
+    return createChild(type, id);
   }
 
   //----------------------------------------------------------------------------
   ElementPtr Group::getElementById(const std::string& id)
   {
-    std::vector<GroupPtr> groups;
-
-    BOOST_FOREACH( ChildList::value_type child, _children )
+    if( !_transform.valid() )
     {
-      const ElementPtr& el = child.second;
-      if( el->getProps()->getStringValue("id") == id )
+      warnTransformExpired("getElementById");
+      return ElementPtr();
+    }
+
+    std::vector<GroupPtr> groups;
+    for(size_t i = 0; i < _transform->getNumChildren(); ++i)
+    {
+      const ElementPtr& el = getChildByIndex(i);
+      if( el->get<std::string>("id") == id )
         return el;
 
       GroupPtr group = boost::dynamic_pointer_cast<Group>(el);
@@ -113,11 +161,23 @@ namespace canvas
     return ElementPtr();
   }
 
+  //----------------------------------------------------------------------------
+  void Group::clearEventListener()
+  {
+    if( !_transform.valid() )
+      return warnTransformExpired("clearEventListener");
+
+    for(size_t i = 0; i < _transform->getNumChildren(); ++i)
+      getChildByIndex(i)->clearEventListener();
+
+    Element::clearEventListener();
+  }
+
   //----------------------------------------------------------------------------
   void Group::update(double dt)
   {
-    BOOST_FOREACH( ChildList::value_type child, _children )
-      child.second->update(dt);
+    for(size_t i = 0; i < _transform->getNumChildren(); ++i)
+      getChildByIndex(i)->update(dt);
 
     Element::update(dt);
   }
@@ -126,30 +186,32 @@ namespace canvas
   bool Group::traverse(EventVisitor& visitor)
   {
     // Iterate in reverse order as last child is displayed on top
-    BOOST_REVERSE_FOREACH( ChildList::value_type child, _children )
+    for(size_t i = _transform->getNumChildren(); i --> 0;)
     {
-      if( child.second->accept(visitor) )
+      if( getChildByIndex(i)->accept(visitor) )
         return true;
     }
     return false;
   }
 
   //----------------------------------------------------------------------------
-  bool Group::setStyle(const SGPropertyNode* style)
+  bool Group::setStyle( const SGPropertyNode* style,
+                        const StyleInfo* style_info )
   {
-    // Don't propagate styles directly applicable to this group
-    if( Element::setStyle(style) )
-      return true;
-
-    if(    style->getParent() != _node
-        && _style.find(style->getNameString()) != _style.end() )
+    if( !canApplyStyle(style) )
       return false;
 
-    bool handled = false;
-    BOOST_FOREACH( ChildList::value_type child, _children )
+    bool handled = setStyleImpl(style, style_info);
+    if( style_info->inheritable )
     {
-      if( child.second->setStyle(style) )
-        handled = true;
+      if( !_transform.valid() )
+      {
+        warnTransformExpired("setStyle");
+        return false;
+      }
+
+      for(size_t i = 0; i < _transform->getNumChildren(); ++i)
+        handled |= getChildByIndex(i)->setStyle(style, style_info);
     }
 
     return handled;
@@ -159,17 +221,23 @@ namespace canvas
   osg::BoundingBox Group::getTransformedBounds(const osg::Matrix& m) const
   {
     osg::BoundingBox bb;
-
-    BOOST_FOREACH( ChildList::value_type child, _children )
+    if( !_transform.valid() )
     {
-      if( !child.second->getMatrixTransform()->getNodeMask() )
+      warnTransformExpired("getTransformedBounds");
+      return bb;
+    }
+
+    for(size_t i = 0; i < _transform->getNumChildren(); ++i)
+    {
+      const ElementPtr& child = getChildByIndex(i);
+      if( !child->getMatrixTransform()->getNodeMask() )
         continue;
 
       bb.expandBy
       (
-        child.second->getTransformedBounds
+        child->getTransformedBounds
         (
-          child.second->getMatrixTransform()->getMatrix() * m
+          child->getMatrixTransform()->getMatrix() * m
         )
       );
     }
@@ -177,31 +245,42 @@ namespace canvas
     return bb;
   }
 
+  //----------------------------------------------------------------------------
+  ElementFactory Group::getChildFactory(const std::string& type) const
+  {
+    ElementFactories::iterator child_factory = _child_factories.find(type);
+    if( child_factory != _child_factories.end() )
+      return child_factory->second;
+
+    return ElementFactory();
+  }
+
   //----------------------------------------------------------------------------
   void Group::childAdded(SGPropertyNode* child)
   {
     if( child->getParent() != _node )
       return;
 
-    ChildFactories::iterator child_factory =
-      _child_factories.find( child->getNameString() );
-    if( child_factory != _child_factories.end() )
+    ElementFactory child_factory = getChildFactory( child->getNameString() );
+    if( child_factory )
     {
-      ElementPtr element = child_factory->second(_canvas, child, _style, this);
+      if( !_transform.valid() )
+        return warnTransformExpired("childAdded");
+
+      ElementPtr element = child_factory(_canvas, child, _style, this);
 
       // Add to osg scene graph...
       _transform->addChild( element->getMatrixTransform() );
-      _children.push_back( ChildList::value_type(child, element) );
+
+      // ...and ensure correct ordering
+      handleZIndexChanged(element);
 
       return;
     }
 
-    if( !Element::setStyle(child) )
-    {
-      // Only add style if not applicable to group itself
+    StyleInfo const* style = getStyleInfo(child->getNameString());
+    if( style && style->inheritable )
       _style[ child->getNameString() ] = child;
-      setStyle(child);
-    }
   }
 
   //----------------------------------------------------------------------------
@@ -210,10 +289,15 @@ namespace canvas
     if( node->getParent() != _node )
       return;
 
-    if( _child_factories.find(node->getNameString()) != _child_factories.end() )
+    if( getChildFactory(node->getNameString()) )
     {
-      ChildList::iterator child = findChild(node);
-      if( child == _children.end() )
+      if( !_transform.valid() )
+        // If transform is destroyed also all children are destroyed, so we can
+        // not do anything here.
+        return;
+
+      ElementPtr child = getChild(node);
+      if( !child )
         SG_LOG
         (
           SG_GL,
@@ -222,15 +306,14 @@ namespace canvas
         );
       else
       {
-        _transform->removeChild( child->second->getMatrixTransform() );
-        _children.erase(child);
+        // Remove child from the scenegraph (this automatically invalidates the
+        // reference on the element hold by the MatrixTransform)
+        child->onDestroy();
       }
     }
     else
     {
-      Style::iterator style = _style.find(node->getNameString());
-      if( style != _style.end() )
-        _style.erase(style);
+      _style.erase( node->getNameString() );
     }
   }
 
@@ -239,54 +322,52 @@ namespace canvas
   {
     if(    node->getParent()->getParent() == _node
         && node->getNameString() == "z-index" )
-      return handleZIndexChanged(node->getParent(), node->getIntValue());
+      return handleZIndexChanged( getChild(node->getParent()),
+                                  node->getIntValue() );
   }
 
   //----------------------------------------------------------------------------
-  void Group::handleZIndexChanged(SGPropertyNode* node, int z_index)
+  void Group::handleZIndexChanged(ElementPtr child, int z_index)
   {
-    ChildList::iterator child = findChild(node);
-    if( child == _children.end() )
+    if( !child || !_transform.valid() )
       return;
 
-    osg::Node* tf = child->second->getMatrixTransform();
-    int index = _transform->getChildIndex(tf),
-        index_new = index;
+    osg::ref_ptr<osg::MatrixTransform> tf = child->getMatrixTransform();
+    size_t index = _transform->getChildIndex(tf),
+           index_new = index;
 
-    ChildList::iterator next = child;
-    ++next;
-
-    while(    next != _children.end()
-           && next->first->getIntValue("z-index", 0) <= z_index )
+    for(;; ++index_new)
     {
-      ++index_new;
-      ++next;
+      if( index_new + 1 == _transform->getNumChildren() )
+        break;
+
+      // Move to end of block with same index (= move upwards until the next
+      // element has a higher index)
+      if( getChildByIndex(index_new + 1)->get<int>("z-index", 0) > z_index )
+        break;
     }
 
-    if( index_new != index )
+    if( index_new == index )
     {
-      _children.insert(next, *child);
-    }
-    else
-    {
-      ChildList::iterator prev = child;
-      while(    prev != _children.begin()
-             && (--prev)->first->getIntValue("z-index", 0) > z_index)
+      // We were not able to move upwards so now try downwards
+      for(;; --index_new)
       {
-        --index_new;
+        if( index_new == 0 )
+          break;
+
+        // Move to end of block with same index (= move downwards until the
+        // previous element has the same or a lower index)
+        if( getChildByIndex(index_new - 1)->get<int>("z-index", 0) <= z_index )
+          break;
       }
 
       if( index == index_new )
         return;
-
-      _children.insert(prev, *child);
     }
 
     _transform->removeChild(index);
     _transform->insertChild(index_new, tf);
 
-    _children.erase(child);
-
     SG_LOG
     (
       SG_GENERAL,
@@ -296,14 +377,42 @@ namespace canvas
   }
 
   //----------------------------------------------------------------------------
-  Group::ChildList::iterator Group::findChild(const SGPropertyNode* node)
+  ElementPtr Group::getChildByIndex(size_t index) const
   {
-    return std::find_if
-    (
-      _children.begin(),
-      _children.end(),
-      boost::bind(&ChildList::value_type::first, _1) == node
-    );
+    assert(_transform.valid());
+    OSGUserData* ud =
+      static_cast<OSGUserData*>(_transform->getChild(index)->getUserData());
+    assert(ud);
+    return ud->element;
+  }
+
+  //----------------------------------------------------------------------------
+  ElementPtr Group::findChild( const SGPropertyNode* node,
+                               const std::string& id ) const
+  {
+    if( !_transform.valid() )
+    {
+      warnTransformExpired("findChild");
+      return ElementPtr();
+    }
+
+    for(size_t i = 0; i < _transform->getNumChildren(); ++i)
+    {
+      ElementPtr el = getChildByIndex(i);
+
+      if( node )
+      {
+        if( el->getProps() == node )
+          return el;
+      }
+      else
+      {
+        if( el->get<std::string>("id") == id )
+          return el;
+      }
+    }
+
+    return ElementPtr();
   }
 
 } // namespace canvas

simgear/canvas/elements/CanvasGroup.hxx

@@ -28,10 +28,15 @@ namespace simgear
 namespace canvas
 {
 
+  typedef std::map<std::string, ElementFactory> ElementFactories;
+
   class Group:
     public Element
   {
     public:
+      static const std::string TYPE_NAME;
+      static void staticInit();
+
       typedef std::list< std::pair< const SGPropertyNode*,
                                     ElementPtr
                                   >
@@ -46,6 +51,34 @@ namespace canvas
       ElementPtr createChild( const std::string& type,
                               const std::string& id = "" );
       ElementPtr getChild(const SGPropertyNode* node);
+      ElementPtr getChild(const std::string& id);
+      ElementPtr getOrCreateChild( const std::string& type,
+                                   const std::string& id );
+
+      template<class T>
+      boost::shared_ptr<T> createChild(const std::string& id = "")
+      {
+        return boost::dynamic_pointer_cast<T>( createChild(T::TYPE_NAME, id) );
+      }
+
+      template<class T>
+      boost::shared_ptr<T> getChild(const SGPropertyNode* node)
+      {
+        return boost::dynamic_pointer_cast<T>( getChild(node) );
+      }
+
+      template<class T>
+      boost::shared_ptr<T> getChild(const std::string& id)
+      {
+        return boost::dynamic_pointer_cast<T>( getChild(id) );
+      }
+
+      template<class T>
+      boost::shared_ptr<T> getOrCreateChild(const std::string& id)
+      {
+        return
+          boost::dynamic_pointer_cast<T>( getOrCreateChild(T::TYPE_NAME, id) );
+      }
 
       /**
        * Get first child with given id (breadth-first search)
@@ -54,28 +87,36 @@ namespace canvas
        */
       ElementPtr getElementById(const std::string& id);
 
+      virtual void clearEventListener();
+
       virtual void update(double dt);
 
       virtual bool traverse(EventVisitor& visitor);
 
-      virtual bool setStyle(const SGPropertyNode* child);
+      virtual bool setStyle( const SGPropertyNode* child,
+                             const StyleInfo* style_info = 0 );
 
       virtual osg::BoundingBox getTransformedBounds(const osg::Matrix& m) const;
 
     protected:
 
-      typedef std::map<std::string, ElementFactory> ChildFactories;
+      static ElementFactories   _child_factories;
 
-      ChildFactories    _child_factories;
-      ChildList         _children;
+      /**
+       * Overload in derived classes to allow for more/other types of elements
+       * to be managed.
+       */
+      virtual ElementFactory getChildFactory(const std::string& type) const;
 
       virtual void childAdded(SGPropertyNode * child);
       virtual void childRemoved(SGPropertyNode * child);
       virtual void childChanged(SGPropertyNode * child);
 
-      void handleZIndexChanged(SGPropertyNode* node, int z_index);
+      void handleZIndexChanged(ElementPtr child, int z_index = 0);
 
-      ChildList::iterator findChild(const SGPropertyNode* node);
+      ElementPtr getChildByIndex(size_t index) const;
+      ElementPtr findChild( const SGPropertyNode* node,
+                            const std::string& id ) const;
   };
 
 } // namespace canvas

simgear/canvas/elements/CanvasImage.cxx

@@ -21,6 +21,8 @@
 #include <simgear/canvas/Canvas.hxx>
 #include <simgear/canvas/CanvasMgr.hxx>
 #include <simgear/canvas/CanvasSystemAdapter.hxx>
+#include <simgear/canvas/MouseEvent.hxx>
+#include <simgear/scene/util/OsgMath.hxx>
 #include <simgear/scene/util/parse_color.hxx>
 #include <simgear/misc/sg_path.hxx>
 
@@ -43,9 +45,11 @@ namespace canvas
   {
     public:
       CullCallback(const CanvasWeakPtr& canvas);
+      void cullNextFrame();
 
     private:
       CanvasWeakPtr _canvas;
+      mutable bool  _cull_next_frame;
 
       virtual bool cull( osg::NodeVisitor* nv,
                          osg::Drawable* drawable,
@@ -54,11 +58,18 @@ namespace canvas
 
   //----------------------------------------------------------------------------
   CullCallback::CullCallback(const CanvasWeakPtr& canvas):
-    _canvas( canvas )
+    _canvas( canvas ),
+    _cull_next_frame( false )
   {
 
   }
 
+  //----------------------------------------------------------------------------
+  void CullCallback::cullNextFrame()
+  {
+    _cull_next_frame = true;
+  }
+
   //----------------------------------------------------------------------------
   bool CullCallback::cull( osg::NodeVisitor* nv,
                            osg::Drawable* drawable,
@@ -67,8 +78,27 @@ namespace canvas
     if( !_canvas.expired() )
       _canvas.lock()->enableRendering();
 
-    // TODO check if window/image should be culled
-    return false;
+    if( !_cull_next_frame )
+      // TODO check if window/image should be culled
+      return false;
+
+    _cull_next_frame = false;
+    return true;
+  }
+
+  //----------------------------------------------------------------------------
+  const std::string Image::TYPE_NAME = "image";
+
+  //----------------------------------------------------------------------------
+  void Image::staticInit()
+  {
+    if( isInit<Image>() )
+      return;
+
+    addStyle("fill", "color", &Image::setFill);
+    addStyle("slice", "", &Image::setSlice);
+    addStyle("slice-width", "", &Image::setSliceWidth);
+    addStyle("outset", "", &Image::setOutset);
   }
 
   //----------------------------------------------------------------------------
@@ -82,6 +112,8 @@ namespace canvas
     _src_rect(0,0),
     _region(0,0)
   {
+    staticInit();
+
     _geom = new osg::Geometry;
     _geom->setUseDisplayList(false);
 
@@ -91,28 +123,26 @@ namespace canvas
 
     // allocate arrays for the image
     _vertices = new osg::Vec3Array(4);
-    _vertices->setDataVariance(osg::Object::STATIC);
+    _vertices->setDataVariance(osg::Object::DYNAMIC);
     _geom->setVertexArray(_vertices);
 
     _texCoords = new osg::Vec2Array(4);
-    _texCoords->setDataVariance(osg::Object::STATIC);
+    _texCoords->setDataVariance(osg::Object::DYNAMIC);
     _geom->setTexCoordArray(0, _texCoords);
 
-    _colors = new osg::Vec4Array(4);
-    _colors->setDataVariance(osg::Object::STATIC);
-    _geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
+    _colors = new osg::Vec4Array(1);
+    _colors->setDataVariance(osg::Object::DYNAMIC);
     _geom->setColorArray(_colors);
+    _geom->setColorBinding(osg::Geometry::BIND_OVERALL);
 
-    osg::DrawArrays* prim = new osg::DrawArrays(osg::PrimitiveSet::QUADS);
-    prim->set(osg::PrimitiveSet::QUADS, 0, 4);
-    prim->setDataVariance(osg::Object::STATIC);
-    _geom->addPrimitiveSet(prim);
+    _prim = new osg::DrawArrays(osg::PrimitiveSet::QUADS);
+    _prim->set(osg::PrimitiveSet::QUADS, 0, 4);
+    _prim->setDataVariance(osg::Object::DYNAMIC);
+    _geom->addPrimitiveSet(_prim);
 
     setDrawable(_geom);
 
-    addStyle("fill", &Image::setFill, this);
     setFill("#ffffff"); // TODO how should we handle default values?
-
     setupStyle();
   }
 
@@ -127,14 +157,119 @@ namespace canvas
   {
     Element::update(dt);
 
+    osg::Texture2D* texture = dynamic_cast<osg::Texture2D*>
+    (
+      _geom->getOrCreateStateSet()
+           ->getTextureAttribute(0, osg::StateAttribute::TEXTURE)
+    );
+    simgear::canvas::CanvasPtr canvas = _src_canvas.lock();
+
+    if(    (_attributes_dirty & SRC_CANVAS)
+           // check if texture has changed (eg. due to resizing)
+        || (canvas && texture != canvas->getTexture()) )
+    {
+      _geom->getOrCreateStateSet()
+           ->setTextureAttribute(0, canvas ? canvas->getTexture() : 0);
+
+      if( !canvas || canvas->isInit() )
+        _attributes_dirty &= ~SRC_CANVAS;
+    }
+
+    if( !_attributes_dirty )
+      return;
+
+    const SGRect<int>& tex_dim = getTextureDimensions();
+
+    // http://www.w3.org/TR/css3-background/#border-image-slice
+
+    // The ‘fill’ keyword, if present, causes the middle part of the image to be
+    // preserved. (By default it is discarded, i.e., treated as empty.)
+    bool fill = (_slice.getKeyword() == "fill");
+
     if( _attributes_dirty & DEST_SIZE )
     {
-      (*_vertices)[0].set(_region.l(), _region.t(), 0);
-      (*_vertices)[1].set(_region.r(), _region.t(), 0);
-      (*_vertices)[2].set(_region.r(), _region.b(), 0);
-      (*_vertices)[3].set(_region.l(), _region.b(), 0);
-      _vertices->dirty();
+      size_t num_vertices = (_slice.isValid() ? (fill ? 9 : 8) : 1) * 4;
 
+      if( num_vertices != _prim->getNumPrimitives() )
+      {
+        _vertices->resize(num_vertices);
+        _texCoords->resize(num_vertices);
+        _prim->setCount(num_vertices);
+        _prim->dirty();
+
+        _attributes_dirty |= SRC_RECT;
+      }
+
+      // http://www.w3.org/TR/css3-background/#border-image-outset
+      SGRect<float> region = _region;
+      if( _outset.isValid() )
+      {
+        const CSSBorder::Offsets& outset = _outset.getAbsOffsets(tex_dim);
+        region.t() -= outset.t;
+        region.r() += outset.r;
+        region.b() += outset.b;
+        region.l() -= outset.l;
+      }
+
+      if( !_slice.isValid() )
+      {
+        setQuad(0, region.getMin(), region.getMax());
+      }
+      else
+      {
+        /*
+        Image slice, 9-scale, whatever it is called. The four corner images
+        stay unscaled (tl, tr, bl, br) whereas the other parts are scaled to
+        fill the remaining space up to the specified size.
+
+        x[0] x[1]     x[2] x[3]
+          |    |        |    |
+          -------------------- - y[0]
+          | tl |   top  | tr |
+          -------------------- - y[1]
+          |    |        |    |
+          | l  |        |  r |
+          | e  | center |  i |
+          | f  |        |  g |
+          | t  |        |  h |
+          |    |        |  t |
+          -------------------- - y[2]
+          | bl | bottom | br |
+          -------------------- - y[3]
+         */
+
+        const CSSBorder::Offsets& slice =
+          (_slice_width.isValid() ? _slice_width : _slice)
+          .getAbsOffsets(tex_dim);
+        float x[4] = {
+          region.l(),
+          region.l() + slice.l,
+          region.r() - slice.r,
+          region.r()
+        };
+        float y[4] = {
+          region.t(),
+          region.t() + slice.t,
+          region.b() - slice.b,
+          region.b()
+        };
+
+        int i = 0;
+        for(int ix = 0; ix < 3; ++ix)
+          for(int iy = 0; iy < 3; ++iy)
+          {
+            if( ix == 1 && iy == 1 && !fill )
+              // The ‘fill’ keyword, if present, causes the middle part of the
+              // image to be filled.
+              continue;
+
+            setQuad( i++,
+                     SGVec2f(x[ix    ], y[iy    ]),
+                     SGVec2f(x[ix + 1], y[iy + 1]) );
+          }
+      }
+
+      _vertices->dirty();
       _attributes_dirty &= ~DEST_SIZE;
       _geom->dirtyBound();
       setBoundingBox(_geom->getBound());
@@ -142,46 +277,105 @@ namespace canvas
 
     if( _attributes_dirty & SRC_RECT )
     {
-      double u0 = _src_rect.l(),
-             u1 = _src_rect.r(),
-             v0 = _src_rect.b(),
-             v1 = _src_rect.t();
-
+      SGRect<float> src_rect = _src_rect;
       if( !_node_src_rect->getBoolValue("normalized", true) )
       {
-        const SGRect<int>& tex_dim = getTextureDimensions();
-
-        u0 /= tex_dim.width();
-        u1 /= tex_dim.width();
-        v0 /= tex_dim.height();
-        v1 /= tex_dim.height();
+        src_rect.t() /= tex_dim.height();
+        src_rect.r() /= tex_dim.width();
+        src_rect.b() /= tex_dim.height();
+        src_rect.l() /= tex_dim.width();
       }
 
-      (*_texCoords)[0].set(u0, v0);
-      (*_texCoords)[1].set(u1, v0);
-      (*_texCoords)[2].set(u1, v1);
-      (*_texCoords)[3].set(u0, v1);
-      _texCoords->dirty();
+      // Image coordinate systems y-axis is flipped
+      std::swap(src_rect.t(), src_rect.b());
 
+      if( !_slice.isValid() )
+      {
+        setQuadUV(0, src_rect.getMin(), src_rect.getMax());
+      }
+      else
+      {
+        const CSSBorder::Offsets& slice = _slice.getRelOffsets(tex_dim);
+        float x[4] = {
+          src_rect.l(),
+          src_rect.l() + slice.l,
+          src_rect.r() - slice.r,
+          src_rect.r()
+        };
+        float y[4] = {
+          src_rect.t(),
+          src_rect.t() - slice.t,
+          src_rect.b() + slice.b,
+          src_rect.b()
+        };
+
+        int i = 0;
+        for(int ix = 0; ix < 3; ++ix)
+          for(int iy = 0; iy < 3; ++iy)
+          {
+            if( ix == 1 && iy == 1 && !fill )
+              // The ‘fill’ keyword, if present, causes the middle part of the
+              // image to be filled.
+              continue;
+
+            setQuadUV( i++,
+                       SGVec2f(x[ix    ], y[iy    ]),
+                       SGVec2f(x[ix + 1], y[iy + 1]) );
+          }
+      }
+
+      _texCoords->dirty();
       _attributes_dirty &= ~SRC_RECT;
     }
   }
 
+  //----------------------------------------------------------------------------
+  void Image::valueChanged(SGPropertyNode* child)
+  {
+    // If the image is switched from invisible to visible, and it shows a
+    // canvas, we need to delay showing it by one frame to ensure the canvas is
+    // updated before the image is displayed.
+    //
+    // As canvas::Element handles and filters changes to the "visible" property
+    // we can not check this in Image::childChanged but instead have to override
+    // Element::valueChanged.
+    if(    !isVisible()
+        && child->getParent() == _node
+        && child->getNameString() == "visible"
+        && child->getBoolValue() )
+    {
+      CullCallback* cb = static_cast<CullCallback*>(_geom->getCullCallback());
+      if( cb )
+        cb->cullNextFrame();
+    }
+
+    Element::valueChanged(child);
+  }
+
   //----------------------------------------------------------------------------
   void Image::setSrcCanvas(CanvasPtr canvas)
   {
-    if( !_src_canvas.expired() )
-      _src_canvas.lock()->removeDependentCanvas(_canvas);
+    CanvasPtr src_canvas = _src_canvas.lock(),
+              self_canvas = _canvas.lock();
 
-    _src_canvas = canvas;
-    _geom->getOrCreateStateSet()
-         ->setTextureAttribute(0, canvas ? canvas->getTexture() : 0);
+    if( src_canvas )
+      src_canvas->removeParentCanvas(self_canvas);
+    if( self_canvas )
+      self_canvas->removeChildCanvas(src_canvas);
+
+    _src_canvas = src_canvas = canvas;
+    _attributes_dirty |= SRC_CANVAS;
     _geom->setCullCallback(canvas ? new CullCallback(canvas) : 0);
 
-    if( !_src_canvas.expired() )
+    if( src_canvas )
     {
       setupDefaultDimensions();
-      _src_canvas.lock()->addDependentCanvas(_canvas);
+
+      if( self_canvas )
+      {
+        self_canvas->addChildCanvas(src_canvas);
+        src_canvas->addParentCanvas(self_canvas);
+      }
     }
   }
 
@@ -197,7 +391,10 @@ namespace canvas
     // remove canvas...
     setSrcCanvas( CanvasPtr() );
 
+    _texture->setResizeNonPowerOfTwoHint(false);
     _texture->setImage(img);
+    _texture->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
+    _texture->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
     _geom->getOrCreateStateSet()
          ->setTextureAttributeAndModes(0, _texture);
 
@@ -208,21 +405,80 @@ namespace canvas
   //----------------------------------------------------------------------------
   void Image::setFill(const std::string& fill)
   {
-    osg::Vec4 color;
-    if( !parseColor(fill, color) )
+    osg::Vec4 color(1,1,1,1);
+    if(    !fill.empty() // If no color is given default to white
+        && !parseColor(fill, color) )
       return;
 
-    for( int i = 0; i < 4; ++i )
-      (*_colors)[i] = color;
+    _colors->front() = color;
     _colors->dirty();
   }
 
+  //----------------------------------------------------------------------------
+  void Image::setSlice(const std::string& slice)
+  {
+    _slice = CSSBorder::parse(slice);
+    _attributes_dirty |= SRC_RECT | DEST_SIZE;
+  }
+
+  //----------------------------------------------------------------------------
+  void Image::setSliceWidth(const std::string& width)
+  {
+    _slice_width = CSSBorder::parse(width);
+    _attributes_dirty |= DEST_SIZE;
+  }
+
+  //----------------------------------------------------------------------------
+  void Image::setOutset(const std::string& outset)
+  {
+    _outset = CSSBorder::parse(outset);
+    _attributes_dirty |= DEST_SIZE;
+  }
+
   //----------------------------------------------------------------------------
   const SGRect<float>& Image::getRegion() const
   {
     return _region;
   }
 
+  //----------------------------------------------------------------------------
+  bool Image::handleEvent(EventPtr event)
+  {
+    bool handled = Element::handleEvent(event);
+
+    CanvasPtr src_canvas = _src_canvas.lock();
+    if( !src_canvas )
+      return handled;
+
+    MouseEventPtr mouse_event = boost::dynamic_pointer_cast<MouseEvent>(event);
+    if( mouse_event )
+    {
+      mouse_event.reset( new MouseEvent(*mouse_event) );
+      event = mouse_event;
+
+      mouse_event->client_pos = mouse_event->local_pos
+                              - toOsg(_region.getMin());
+
+      osg::Vec2f size(_region.width(), _region.height());
+      if( _outset.isValid() )
+      {
+        CSSBorder::Offsets outset =
+          _outset.getAbsOffsets(getTextureDimensions());
+
+        mouse_event->client_pos += osg::Vec2f(outset.l, outset.t);
+        size.x() += outset.l + outset.r;
+        size.y() += outset.t + outset.b;
+      }
+
+      // Scale event pos according to canvas view size vs. displayed/screen size
+      mouse_event->client_pos.x() *= src_canvas->getViewWidth() / size.x();
+      mouse_event->client_pos.y() *= src_canvas->getViewHeight()/ size.y();
+      mouse_event->local_pos = mouse_event->client_pos;
+    }
+
+    return handled | src_canvas->handleMouseEvent(mouse_event);
+  }
+
   //----------------------------------------------------------------------------
   void Image::childChanged(SGPropertyNode* child)
   {
@@ -309,7 +565,7 @@ namespace canvas
       }
       else
       {
-        setImage( canvas->getSystemAdapter()->getImage(path) );
+        setImage( Canvas::getSystemAdapter()->getImage(path) );
       }
     }
   }
@@ -319,36 +575,67 @@ namespace canvas
   {
     if( !_src_rect.width() || !_src_rect.height() )
     {
-      const SGRect<int>& tex_dim = getTextureDimensions();
-
-      _node_src_rect->setBoolValue("normalized", false);
-      _node_src_rect->setFloatValue("right", tex_dim.width());
-      _node_src_rect->setFloatValue("bottom", tex_dim.height());
+      // Show whole image by default
+      _node_src_rect->setBoolValue("normalized", true);
+      _node_src_rect->setFloatValue("right", 1);
+      _node_src_rect->setFloatValue("bottom", 1);
     }
 
     if( !_region.width() || !_region.height() )
     {
-      _node->setFloatValue("size[0]", _src_rect.width());
-      _node->setFloatValue("size[1]", _src_rect.height());
+      // Default to image size.
+      // TODO handle showing only part of image?
+      const SGRect<int>& dim = getTextureDimensions();
+      _node->setFloatValue("size[0]", dim.width());
+      _node->setFloatValue("size[1]", dim.height());
     }
   }
 
   //----------------------------------------------------------------------------
   SGRect<int> Image::getTextureDimensions() const
   {
-    osg::Texture2D *texture = !_src_canvas.expired()
-                            ? _src_canvas.lock()->getTexture()
-                            : _texture.get();
+    CanvasPtr canvas = _src_canvas.lock();
+    SGRect<int> dim(0,0);
 
-    if( !texture )
-      return SGRect<int>();
+    // Use canvas/image dimensions rather than texture dimensions, as they could
+    // be resized internally by OpenSceneGraph (eg. to nearest power of two).
+    if( canvas )
+    {
+      dim.setRight( canvas->getViewWidth() );
+      dim.setBottom( canvas->getViewHeight() );
+    }
+    else if( _texture )
+    {
+      osg::Image* img = _texture->getImage();
 
-    return SGRect<int>
-    (
-      0,0,
-      texture->getTextureWidth(),
-      texture->getTextureHeight()
-    );
+      if( img )
+      {
+        dim.setRight( img->s() );
+        dim.setBottom( img->t() );
+      }
+    }
+
+    return dim;
+  }
+
+  //----------------------------------------------------------------------------
+  void Image::setQuad(size_t index, const SGVec2f& tl, const SGVec2f& br)
+  {
+    int i = index * 4;
+    (*_vertices)[i + 0].set(tl.x(), tl.y(), 0);
+    (*_vertices)[i + 1].set(br.x(), tl.y(), 0);
+    (*_vertices)[i + 2].set(br.x(), br.y(), 0);
+    (*_vertices)[i + 3].set(tl.x(), br.y(), 0);
+  }
+
+  //----------------------------------------------------------------------------
+  void Image::setQuadUV(size_t index, const SGVec2f& tl, const SGVec2f& br)
+  {
+    int i = index * 4;
+    (*_texCoords)[i + 0].set(tl.x(), tl.y());
+    (*_texCoords)[i + 1].set(br.x(), tl.y());
+    (*_texCoords)[i + 2].set(br.x(), br.y());
+    (*_texCoords)[i + 3].set(tl.x(), br.y());
   }
 
 } // namespace canvas

simgear/canvas/elements/CanvasImage.hxx

@@ -22,7 +22,7 @@
 #include "CanvasElement.hxx"
 
 #include <simgear/canvas/canvas_fwd.hxx>
-#include <simgear/math/SGRect.hxx>
+#include <simgear/misc/CSSBorder.hxx>
 #include <osg/Texture2D>
 
 namespace simgear
@@ -34,6 +34,9 @@ namespace canvas
     public Element
   {
     public:
+      static const std::string TYPE_NAME;
+      static void staticInit();
+
       /**
        * @param node    Property node containing settings for this image:
        *                  rect/[left/right/top/bottom]  Dimensions of source
@@ -43,11 +46,12 @@ namespace canvas
        */
       Image( const CanvasWeakPtr& canvas,
              const SGPropertyNode_ptr& node,
-             const Style& parent_style,
+             const Style& parent_style = Style(),
              Element* parent = 0 );
       virtual ~Image();
 
       virtual void update(double dt);
+      virtual void valueChanged(SGPropertyNode* child);
 
       void setSrcCanvas(CanvasPtr canvas);
       CanvasWeakPtr getSrcCanvas() const;
@@ -55,14 +59,40 @@ namespace canvas
       void setImage(osg::Image *img);
       void setFill(const std::string& fill);
 
+      /**
+       * Set image slice (aka. 9-scale)
+       *
+       * @see http://www.w3.org/TR/css3-background/#border-image-slice
+       */
+      void setSlice(const std::string& slice);
+
+      /**
+       * Set image slice width.
+       *
+       * By default the size of the 9-scale grid is the same as specified
+       * with setSlice/"slice". Using this method allows setting values
+       * different to the size in the source image.
+       *
+       * @see http://www.w3.org/TR/css3-background/#border-image-width
+       */
+      void setSliceWidth(const std::string& width);
+
+      /**
+       * http://www.w3.org/TR/css3-background/#border-image-outset
+       */
+      void setOutset(const std::string& outset);
+
       const SGRect<float>& getRegion() const;
 
+      bool handleEvent(EventPtr event);
+
     protected:
 
       enum ImageAttributes
       {
         SRC_RECT       = LAST_ATTRIBUTE << 1, // Source image rectangle
-        DEST_SIZE      = SRC_RECT << 1        // Element size
+        DEST_SIZE      = SRC_RECT << 1,       // Element size
+        SRC_CANVAS     = DEST_SIZE << 1
       };
 
       virtual void childChanged(SGPropertyNode * child);
@@ -70,11 +100,15 @@ namespace canvas
       void setupDefaultDimensions();
       SGRect<int> getTextureDimensions() const;
 
+      void setQuad(size_t index, const SGVec2f& tl, const SGVec2f& br);
+      void setQuadUV(size_t index, const SGVec2f& tl, const SGVec2f& br);
+
       osg::ref_ptr<osg::Texture2D> _texture;
       // TODO optionally forward events to canvas
       CanvasWeakPtr _src_canvas;
 
       osg::ref_ptr<osg::Geometry>  _geom;
+      osg::ref_ptr<osg::DrawArrays>_prim;
       osg::ref_ptr<osg::Vec3Array> _vertices;
       osg::ref_ptr<osg::Vec2Array> _texCoords;
       osg::ref_ptr<osg::Vec4Array> _colors;
@@ -82,6 +116,10 @@ namespace canvas
       SGPropertyNode *_node_src_rect;
       SGRect<float>   _src_rect,
                       _region;
+
+      CSSBorder       _slice,
+                      _slice_width,
+                      _outset;
   };
 
 } // namespace canvas

simgear/canvas/elements/CanvasMap.cxx

@@ -42,7 +42,20 @@ namespace simgear
 namespace canvas
 {
 
+  //----------------------------------------------------------------------------
   const std::string GEO = "-geo";
+  const std::string Map::TYPE_NAME = "map";
+
+  //----------------------------------------------------------------------------
+  void Map::staticInit()
+  {
+    Group::staticInit();
+
+    if( isInit<Map>() )
+      return;
+
+    // Do some initialization if needed...
+  }
 
   //----------------------------------------------------------------------------
   Map::Map( const CanvasWeakPtr& canvas,
@@ -54,7 +67,7 @@ namespace canvas
     _projection(new SansonFlamsteedProjection),
     _projection_dirty(true)
   {
-
+    staticInit();
   }
 
   //----------------------------------------------------------------------------
@@ -192,6 +205,8 @@ namespace canvas
       _projection->setOrientation(child->getFloatValue());
     else if( child->getNameString() == "range" )
       _projection->setRange(child->getDoubleValue());
+    else if( child->getNameString() == "screen-range" )
+      _projection->setScreenRange(child->getDoubleValue());
     else
       return Group::childChanged(child);
 

simgear/canvas/elements/CanvasMap.hxx

@@ -35,6 +35,9 @@ namespace canvas
     public Group
   {
     public:
+      static const std::string TYPE_NAME;
+      static void staticInit();
+
       Map( const CanvasWeakPtr& canvas,
            const SGPropertyNode_ptr& node,
            const Style& parent_style,

simgear/canvas/elements/CanvasPath.cxx

@@ -20,7 +20,6 @@
 #include <simgear/scene/util/parse_color.hxx>
 
 #include <osg/Drawable>
-#include <osg/BlendFunc>
 
 #include <vg/openvg.h>
 #include <cassert>
@@ -111,7 +110,7 @@ namespace canvas
        */
       void setFill(const std::string& fill)
       {
-        if( fill == "none" )
+        if( fill.empty() || fill == "none" )
         {
           _mode &= ~VG_FILL_PATH;
         }
@@ -151,7 +150,7 @@ namespace canvas
        */
       void setStroke(const std::string& stroke)
       {
-        if( stroke == "none" )
+        if( stroke.empty() || stroke == "none" )
         {
           _mode &= ~VG_STROKE_PATH;
         }
@@ -429,6 +428,9 @@ namespace canvas
        */
       void update()
       {
+        if( !vgHasContextSH() )
+          return;
+
         if( _attributes_dirty & PATH )
         {
           const VGbitfield caps = VG_PATH_CAPABILITY_APPEND_TO
@@ -467,6 +469,25 @@ namespace canvas
       };
   };
 
+  //----------------------------------------------------------------------------
+  const std::string Path::TYPE_NAME = "path";
+
+  //----------------------------------------------------------------------------
+  void Path::staticInit()
+  {
+    if( isInit<Path>() )
+      return;
+
+    PathDrawableRef Path::*path = &Path::_path;
+
+    addStyle("fill", "color", &PathDrawable::setFill, path);
+    addStyle("fill-rule", "", &PathDrawable::setFillRule, path);
+    addStyle("stroke", "color", &PathDrawable::setStroke, path);
+    addStyle("stroke-width", "numeric", &PathDrawable::setStrokeWidth, path);
+    addStyle("stroke-dasharray", "", &PathDrawable::setStrokeDashArray, path);
+    addStyle("stroke-linecap", "", &PathDrawable::setStrokeLinecap, path);
+  }
+
   //----------------------------------------------------------------------------
   Path::Path( const CanvasWeakPtr& canvas,
               const SGPropertyNode_ptr& node,
@@ -475,16 +496,9 @@ namespace canvas
     Element(canvas, node, parent_style, parent),
     _path( new PathDrawable(this) )
   {
+    staticInit();
+
     setDrawable(_path);
-    PathDrawable *path = _path.get();
-
-    addStyle("fill", &PathDrawable::setFill, path);
-    addStyle("fill-rule", &PathDrawable::setFillRule, path);
-    addStyle("stroke", &PathDrawable::setStroke, path);
-    addStyle("stroke-width", &PathDrawable::setStrokeWidth, path);
-    addStyle("stroke-dasharray", &PathDrawable::setStrokeDashArray, path);
-    addStyle("stroke-linecap", &PathDrawable::setStrokeLinecap, path);
-
     setupStyle();
   }
 
@@ -517,6 +531,60 @@ namespace canvas
     return _path->getTransformedBounds(m);
   }
 
+  //----------------------------------------------------------------------------
+  Path& Path::moveTo(float x_abs, float y_abs)
+  {
+    return addSegment(VG_MOVE_TO_ABS, x_abs, y_abs);
+  }
+
+  //----------------------------------------------------------------------------
+  Path& Path::move(float x_rel, float y_rel)
+  {
+    return addSegment(VG_MOVE_TO_REL, x_rel, y_rel);
+  }
+
+  //----------------------------------------------------------------------------
+  Path& Path::lineTo(float x_abs, float y_abs)
+  {
+    return addSegment(VG_LINE_TO_ABS, x_abs, y_abs);
+  }
+
+  //----------------------------------------------------------------------------
+  Path& Path::line(float x_rel, float y_rel)
+  {
+    return addSegment(VG_LINE_TO_REL, x_rel, y_rel);
+  }
+
+  //----------------------------------------------------------------------------
+  Path& Path::horizTo(float x_abs)
+  {
+    return addSegment(VG_HLINE_TO_ABS, x_abs);
+  }
+
+  //----------------------------------------------------------------------------
+  Path& Path::horiz(float x_rel)
+  {
+    return addSegment(VG_HLINE_TO_REL, x_rel);
+  }
+
+  //----------------------------------------------------------------------------
+  Path& Path::vertTo(float y_abs)
+  {
+    return addSegment(VG_VLINE_TO_ABS, y_abs);
+  }
+
+  //----------------------------------------------------------------------------
+  Path& Path::vert(float y_rel)
+  {
+    return addSegment(VG_VLINE_TO_REL, y_rel);
+  }
+
+  //----------------------------------------------------------------------------
+  Path& Path::close()
+  {
+    return addSegment(VG_CLOSE_PATH);
+  }
+
   //----------------------------------------------------------------------------
   void Path::childRemoved(SGPropertyNode* child)
   {

simgear/canvas/elements/CanvasPath.hxx

@@ -20,6 +20,7 @@
 #define CANVAS_PATH_HXX_
 
 #include "CanvasElement.hxx"
+#include <boost/preprocessor/iteration/iterate.hpp>
 
 namespace simgear
 {
@@ -29,6 +30,9 @@ namespace canvas
     public Element
   {
     public:
+      static const std::string TYPE_NAME;
+      static void staticInit();
+
       Path( const CanvasWeakPtr& canvas,
             const SGPropertyNode_ptr& node,
             const Style& parent_style,
@@ -39,6 +43,30 @@ namespace canvas
 
       virtual osg::BoundingBox getTransformedBounds(const osg::Matrix& m) const;
 
+#define BOOST_PP_ITERATION_LIMITS (0, 6)
+#define BOOST_PP_FILENAME_1 \
+        <simgear/canvas/elements/detail/add_segment_variadic.hxx>
+#include BOOST_PP_ITERATE()
+
+      /** Move path cursor */
+      Path& moveTo(float x_abs, float y_abs);
+      Path& move(float x_rel, float y_rel);
+
+      /** Add a line */
+      Path& lineTo(float x_abs, float y_abs);
+      Path& line(float x_rel, float y_rel);
+
+      /** Add a horizontal line */
+      Path& horizTo(float x_abs);
+      Path& horiz(float x_rel);
+
+      /** Add a vertical line */
+      Path& vertTo(float y_abs);
+      Path& vert(float y_rel);
+
+      /** Close the path (implicit lineTo to first point of path) */
+      Path& close();
+
     protected:
 
       enum PathAttributes
@@ -48,7 +76,8 @@ namespace canvas
       };
 
       class PathDrawable;
-      osg::ref_ptr<PathDrawable> _path;
+      typedef osg::ref_ptr<PathDrawable> PathDrawableRef;
+      PathDrawableRef _path;
 
       virtual void childRemoved(SGPropertyNode * child);
       virtual void childChanged(SGPropertyNode * child);

simgear/canvas/elements/CanvasText.cxx

@@ -20,6 +20,7 @@
 #include <simgear/canvas/Canvas.hxx>
 #include <simgear/canvas/CanvasSystemAdapter.hxx>
 #include <simgear/scene/util/parse_color.hxx>
+#include <osg/Version>
 #include <osgText/Text>
 
 namespace simgear
@@ -33,7 +34,9 @@ namespace canvas
 
       TextOSG(canvas::Text* text);
 
+      void setFontResolution(int res);
       void setCharacterAspect(float aspect);
+      void setLineHeight(float factor);
       void setFill(const std::string& fill);
       void setBackgroundColor(const std::string& fill);
 
@@ -44,13 +47,21 @@ namespace canvas
     protected:
 
       canvas::Text *_text_element;
+
+      virtual void computePositions(unsigned int contextID) const;
   };
 
   //----------------------------------------------------------------------------
   Text::TextOSG::TextOSG(canvas::Text* text):
     _text_element(text)
   {
+    setBackdropImplementation(NO_DEPTH_BUFFER);
+  }
 
+  //----------------------------------------------------------------------------
+  void Text::TextOSG::setFontResolution(int res)
+  {
+    TextBase::setFontResolution(res, res);
   }
 
   //----------------------------------------------------------------------------
@@ -59,6 +70,12 @@ namespace canvas
     setCharacterSize(getCharacterHeight(), aspect);
   }
 
+  //----------------------------------------------------------------------------
+  void Text::TextOSG::setLineHeight(float factor)
+  {
+    setLineSpacing(factor - 1);
+  }
+
   //----------------------------------------------------------------------------
   void Text::TextOSG::setFill(const std::string& fill)
   {
@@ -165,16 +182,118 @@ namespace canvas
     if( !bb.valid() )
       return bb;
 
+#if OSG_VERSION_LESS_THAN(3,1,0)
     // TODO bounding box still doesn't seem always right (eg. with center
     //      horizontal alignment not completely accurate)
     bb._min.y() += _offset.y();
     bb._max.y() += _offset.y();
+#endif
 
     _text_element->setBoundingBox(bb);
 
     return bb;
   }
 
+  //----------------------------------------------------------------------------
+  void Text::TextOSG::computePositions(unsigned int contextID) const
+  {
+    if( _textureGlyphQuadMap.empty() || _layout == VERTICAL )
+      return osgText::Text::computePositions(contextID);
+
+    // TODO check when it can be larger
+    assert( _textureGlyphQuadMap.size() == 1 );
+
+    const GlyphQuads& quads = _textureGlyphQuadMap.begin()->second;
+    const GlyphQuads::Glyphs& glyphs = quads._glyphs;
+    const GlyphQuads::Coords2& coords = quads._coords;
+    const GlyphQuads::LineNumbers& line_numbers = quads._lineNumbers;
+
+    float wr = _characterHeight / getCharacterAspectRatio();
+
+    size_t cur_line = static_cast<size_t>(-1);
+    for(size_t i = 0; i < glyphs.size(); ++i)
+    {
+      // Check horizontal offsets
+
+      bool first_char = cur_line != line_numbers[i];
+      cur_line = line_numbers[i];
+
+      bool last_char = (i + 1 == glyphs.size())
+                    || (cur_line != line_numbers[i + 1]);
+
+      if( first_char || last_char )
+      {
+        // From osg/src/osgText/Text.cpp:
+        //
+        // osg::Vec2 upLeft = local+osg::Vec2(0.0f-fHorizQuadMargin, ...);
+        // osg::Vec2 lowLeft = local+osg::Vec2(0.0f-fHorizQuadMargin, ...);
+        // osg::Vec2 lowRight = local+osg::Vec2(width+fHorizQuadMargin, ...);
+        // osg::Vec2 upRight = local+osg::Vec2(width+fHorizQuadMargin, ...);
+
+        float left = coords[i * 4].x(),
+              right = coords[i * 4 + 2].x(),
+              width = glyphs[i]->getWidth() * wr;
+
+        // (local + width + fHoriz) - (local - fHoriz) = width + 2*fHoriz | -width
+        float margin = 0.5f * (right - left - width),
+              cursor_x = left + margin
+                       - glyphs[i]->getHorizontalBearing().x() * wr;
+
+        if( first_char )
+        {
+          if( cur_line == 0 || cursor_x < _textBB._min.x() )
+            _textBB._min.x() = cursor_x;
+        }
+
+        if( last_char )
+        {
+          float cursor_w = cursor_x + glyphs[i]->getHorizontalAdvance() * wr;
+
+          if( cur_line == 0 || cursor_w > _textBB._max.x() )
+            _textBB._max.x() = cursor_w;
+        }
+      }
+    }
+
+    return osgText::Text::computePositions(contextID);
+  }
+
+  //----------------------------------------------------------------------------
+  const std::string Text::TYPE_NAME = "text";
+
+  //----------------------------------------------------------------------------
+  void Text::staticInit()
+  {
+    if( isInit<Text>() )
+      return;
+
+    osg::ref_ptr<TextOSG> Text::*text = &Text::_text;
+
+    addStyle("fill", "color", &TextOSG::setFill, text);
+    addStyle("background", "color", &TextOSG::setBackgroundColor, text);
+    addStyle("character-size",
+             "numeric",
+             static_cast<
+               void (TextOSG::*)(float)
+             > (&TextOSG::setCharacterSize),
+             text);
+    addStyle("character-aspect-ratio",
+             "numeric",
+             &TextOSG::setCharacterAspect, text);
+    addStyle("line-height", "numeric", &TextOSG::setLineHeight, text);
+    addStyle("font-resolution", "numeric", &TextOSG::setFontResolution, text);
+    addStyle("padding", "numeric", &TextOSG::setBoundingBoxMargin, text);
+    //  TEXT              = 1 default
+    //  BOUNDINGBOX       = 2
+    //  FILLEDBOUNDINGBOX = 4
+    //  ALIGNMENT         = 8
+    addStyle<int>("draw-mode", "", &TextOSG::setDrawMode, text);
+    addStyle("max-width", "numeric", &TextOSG::setMaximumWidth, text);
+    addStyle("font", "", &Text::setFont);
+    addStyle("alignment", "", &Text::setAlignment);
+    addStyle("text", "", &Text::setText, false);
+  }
+
   //----------------------------------------------------------------------------
   Text::Text( const CanvasWeakPtr& canvas,
               const SGPropertyNode_ptr& node,
@@ -183,28 +302,13 @@ namespace canvas
     Element(canvas, node, parent_style, parent),
     _text( new Text::TextOSG(this) )
   {
+    staticInit();
+
     setDrawable(_text);
     _text->setCharacterSizeMode(osgText::Text::OBJECT_COORDS);
     _text->setAxisAlignment(osgText::Text::USER_DEFINED_ROTATION);
     _text->setRotation(osg::Quat(osg::PI, osg::X_AXIS));
 
-    addStyle("fill", &TextOSG::setFill, _text);
-    addStyle("background", &TextOSG::setBackgroundColor, _text);
-    addStyle("character-size",
-             static_cast<void (TextOSG::*)(float)>(&TextOSG::setCharacterSize),
-             _text);
-    addStyle("character-aspect-ratio", &TextOSG::setCharacterAspect, _text);
-    addStyle("padding", &TextOSG::setBoundingBoxMargin, _text);
-    //  TEXT              = 1 default
-    //  BOUNDINGBOX       = 2
-    //  FILLEDBOUNDINGBOX = 4
-    //  ALIGNMENT         = 8
-    addStyle<int>("draw-mode", &TextOSG::setDrawMode, _text);
-    addStyle("max-width", &TextOSG::setMaximumWidth, _text);
-    addStyle("font", &Text::setFont, this);
-    addStyle("alignment", &Text::setAlignment, this);
-    addStyle("text", &Text::setText, this);
-
     setupStyle();
   }
 
@@ -223,7 +327,7 @@ namespace canvas
   //----------------------------------------------------------------------------
   void Text::setFont(const char* name)
   {
-    _text->setFont( _canvas.lock()->getSystemAdapter()->getFont(name) );
+    _text->setFont( Canvas::getSystemAdapter()->getFont(name) );
   }
 
   //----------------------------------------------------------------------------

simgear/canvas/elements/CanvasText.hxx

@@ -33,6 +33,9 @@ namespace canvas
     public Element
   {
     public:
+      static const std::string TYPE_NAME;
+      static void staticInit();
+
       Text( const CanvasWeakPtr& canvas,
             const SGPropertyNode_ptr& node,
             const Style& parent_style,

simgear/canvas/elements/detail/add_segment_variadic.hxx

@@ -0,0 +1,21 @@
+#ifndef CANVAS_PATH_HXX_
+# error Canvas - do not include this file!
+#endif
+
+#define n BOOST_PP_ITERATION()
+
+Path& addSegment( uint8_t cmd
+                  BOOST_PP_COMMA_IF(n)
+                  BOOST_PP_ENUM_PARAMS(n, float coord) )
+{
+  _node->addChild("cmd")->setIntValue(cmd);
+
+#define SG_CANVAS_PATH_SET_COORD(z, n, dummy)\
+  _node->addChild("coord")->setFloatValue(coord##n);
+
+  BOOST_PP_REPEAT(n, SG_CANVAS_PATH_SET_COORD, 0)
+#undef SG_CANVAS_PATH_SET_COORD
+  return *this;
+}
+
+#undef n

simgear/compiler.h

@@ -46,7 +46,7 @@
 #    warning GCC compilers prior to 3.4 are suspect  
 #  endif
 
-#  define GCC_VERSION (__GNUC__ * 10000 \
+#  define SG_GCC_VERSION (__GNUC__ * 10000 \
                      + __GNUC_MINOR__ * 100 \
                      + __GNUC_PATCHLEVEL__)
 #  define SG_COMPILER_STR "GNU C++ version " SG_STRINGIZE(__GNUC__) "." SG_STRINGIZE(__GNUC_MINOR__)

simgear/constants.h

@@ -1,6 +1,7 @@
 // constants.h -- various constant definitions
 //
 // Written by Curtis Olson, started February 2000.
+// Last change by Eric van den Berg, Feb 2013
 //
 // Copyright (C) 2000  Curtis L. Olson - http://www.flightgear.org/~curt/
 //
@@ -103,6 +104,37 @@ const float SG_RADIANS_TO_DEGREES = 180.0f / SG_PI;
 /** Radius squared (meter) */
 #define SG_EQ_RAD_SQUARE_M   40680645877797.1344
 
+
+// Physical Constants, SI
+
+/**mean gravity on earth */
+#define SG_g0_m_p_s2          9.80665   // m/s2
+
+/**standard pressure at SL */
+#define SG_p0_Pa              101325.0 // Pa
+
+/**standard density at SL */
+#define SG_rho0_kg_p_m3       1.225 // kg/m3
+
+/**standard temperature at SL */
+#define SG_T0_K               288.15   // K (=15degC)
+
+/**specific gas constant of air*/
+#define SG_R_m2_p_s2_p_K      287.05   // m2/s2/K
+
+/**specific heat constant at constant pressure*/
+#define SG_cp_m2_p_s2_p_K 1004.68      // m2/s2/K   
+
+/**ratio of specific heats of air*/
+#define SG_gamma              1.4         // =cp/cv (cp = 1004.68 m2/s2 K , cv = 717.63 m2/s2 K)
+
+/**constant beta used to calculate dynamic viscosity */
+#define SG_beta_kg_p_sm_sqrK  1.458e-06   // kg/s/m/SQRT(K) 
+
+/** Sutherland constant */
+#define SG_S_K                110.4       // K
+
+
 // Conversions
 
 /** Arc seconds to radians.  (arcsec*pi)/(3600*180) = rad */
@@ -165,6 +197,9 @@ const float SG_RADIANS_TO_DEGREES = 180.0f / SG_PI;
 /** Inch Mercury to Pascal */
 #define SG_INHG_TO_PA       3386.388640341
 
+/** slug/ft3 to kg/m3 */
+#define SG_SLUGFT3_TO_KGPM3   515.379
+
 
 /** For divide by zero avoidance, this will be close enough to zero */
 #define SG_EPSILON 0.0000001

simgear/debug/BufferedLogCallback.cxx

@@ -0,0 +1,98 @@
+/** \file BufferedLogCallback.cxx
+ * Buffer certain log messages permanently for later retrieval and display
+ */
+
+// Copyright (C) 2013  James Turner  zakalawe@mac.com
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+     
+#include <simgear/debug/BufferedLogCallback.hxx>
+     
+#include <boost/foreach.hpp>
+     
+#include <simgear/sg_inlines.h>
+#include <simgear/threads/SGThread.hxx>
+#include <simgear/threads/SGGuard.hxx>
+     
+namespace simgear
+{
+
+class BufferedLogCallback::BufferedLogCallbackPrivate
+{
+public:
+    SGMutex m_mutex;
+    vector_cstring m_buffer;
+    unsigned int m_stamp;
+    unsigned int m_maxLength;
+};
+   
+BufferedLogCallback::BufferedLogCallback(sgDebugClass c, sgDebugPriority p) :
+	simgear::LogCallback(c,p),
+    d(new BufferedLogCallbackPrivate)
+{
+    d->m_stamp = 0;
+    d->m_maxLength = 0xffff;
+}
+
+BufferedLogCallback::~BufferedLogCallback()
+{
+    BOOST_FOREACH(unsigned char* msg, d->m_buffer) {
+        free(msg);
+    }
+}
+ 
+void BufferedLogCallback::operator()(sgDebugClass c, sgDebugPriority p, 
+        const char* file, int line, const std::string& aMessage)
+{
+    SG_UNUSED(file);
+    SG_UNUSED(line);
+    
+    if (!shouldLog(c, p)) return;
+    
+    vector_cstring::value_type msg;
+    if (aMessage.size() >= d->m_maxLength) {
+        msg = (vector_cstring::value_type) malloc(d->m_maxLength);
+        strncpy((char*) msg, aMessage.c_str(), d->m_maxLength - 1);
+        msg[d->m_maxLength - 1] = 0; // add final NULL byte
+    } else {
+        msg = (vector_cstring::value_type) strdup(aMessage.c_str());
+    }
+    
+    SGGuard<SGMutex> g(d->m_mutex);
+    d->m_buffer.push_back(msg);
+    d->m_stamp++;
+}
+ 
+unsigned int BufferedLogCallback::stamp() const
+{
+    return d->m_stamp;
+}
+ 
+unsigned int BufferedLogCallback::threadsafeCopy(vector_cstring& aOutput)
+{
+    SGGuard<SGMutex> g(d->m_mutex);
+    size_t sz = d->m_buffer.size();
+    aOutput.resize(sz);
+    memcpy(aOutput.data(), d->m_buffer.data(), sz * sizeof(vector_cstring::value_type));
+    return d->m_stamp;
+} 
+ 
+void BufferedLogCallback::truncateAt(unsigned int t)
+{
+    d->m_maxLength = t;
+}
+ 
+} // of namespace simgear

simgear/debug/BufferedLogCallback.hxx

@@ -0,0 +1,79 @@
+/** \file BufferedLogCallback.hxx
+ * Buffer certain log messages permanently for later retrieval and display
+ */
+
+// Copyright (C) 2013  James Turner  zakalawe@mac.com
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+     
+     
+#ifndef SG_DEBUG_BUFFEREDLOGCALLBACK_HXX
+#define SG_DEBUG_BUFFEREDLOGCALLBACK_HXX
+
+#include <vector>
+#include <memory> // for std::auto_ptr
+
+#include <simgear/debug/logstream.hxx>
+
+namespace simgear
+{
+
+class BufferedLogCallback : public LogCallback
+{
+public:
+    BufferedLogCallback(sgDebugClass c, sgDebugPriority p);
+    virtual ~BufferedLogCallback();
+    
+    /// truncate messages longer than a certain length. This is to work-around
+    /// for broken PUI behaviour, it can be removed once PUI is gone.
+    void truncateAt(unsigned int);
+    
+    virtual void operator()(sgDebugClass c, sgDebugPriority p, 
+        const char* file, int line, const std::string& aMessage);
+    
+    /**
+     * read the stamp value associated with the log buffer. This is
+     * incremented whenever the log contents change, so can be used
+     * to poll for changes.
+     */
+    unsigned int stamp() const;
+    
+    /**
+    * copying a (large) vector of std::string would be very expensive.
+    * once logged, this call retains storage of the underlying string data,
+    * so when copying, it's sufficient to pass around the strings as raw
+    * char arrays. This means we're only copying a vector of pointers,
+    * which is very efficient.
+    */
+    typedef std::vector<unsigned char*> vector_cstring;
+     
+    /**
+     * copy the buffered log data into the provided output list
+     * (which will be cleared first). This method is safe to call from
+     * any thread.
+     *
+     * returns the stamp value of the copied data
+     */
+    unsigned int threadsafeCopy(vector_cstring& aOutput);
+private:
+    class BufferedLogCallbackPrivate;
+    std::auto_ptr<BufferedLogCallbackPrivate> d;
+};
+     
+
+} // of namespace simgear
+
+#endif // of SG_DEBUG_BUFFEREDLOGCALLBACK_HXX

simgear/debug/CMakeLists.txt

@@ -1,7 +1,7 @@
 
 include (SimGearComponent)
 
-set(HEADERS debug_types.h logstream.hxx)
-set(SOURCES logstream.cxx)
+set(HEADERS debug_types.h logstream.hxx BufferedLogCallback.hxx)
+set(SOURCES logstream.cxx BufferedLogCallback.cxx)
 
 simgear_component(debug debug "${SOURCES}" "${HEADERS}")

simgear/debug/logstream.cxx

@@ -20,95 +20,422 @@
 //
 // $Id$
 
-#include <iostream>
+#include <simgear_config.h>
 
 #include "logstream.hxx"
 
-logstream *logstream::global_logstream = 0;
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <algorithm>
 
-bool            logbuf::logging_enabled = true;
-#ifdef _WIN32
-   bool         logbuf::has_console = true;
+#include <boost/foreach.hpp>
+
+#include <simgear/sg_inlines.h>
+#include <simgear/threads/SGThread.hxx>
+#include <simgear/threads/SGQueue.hxx>
+#include <simgear/threads/SGGuard.hxx>
+
+#include <simgear/misc/sg_path.hxx>
+
+#ifdef SG_WINDOWS
+// for AllocConsole, OutputDebugString
+    #include "windows.h"
 #endif
-sgDebugClass    logbuf::logClass        = SG_NONE;
-sgDebugPriority logbuf::logPriority     = SG_INFO;
-streambuf*      logbuf::sbuf            = NULL;
 
-namespace {
-struct ignore_me
+const char* debugClassToString(sgDebugClass c)
 {
-    ignore_me()
+    switch (c) {
+    case SG_NONE:       return "none";
+    case SG_TERRAIN:    return "terrain";
+    case SG_ASTRO:      return "astro";
+    case SG_FLIGHT:     return "flight";
+    case SG_INPUT:      return "input";
+    case SG_GL:         return "opengl";
+    case SG_VIEW:       return "view";
+    case SG_COCKPIT:    return "cockpit";
+    case SG_GENERAL:    return "general";
+    case SG_MATH:       return "math";
+    case SG_EVENT:      return "event";
+    case SG_AIRCRAFT:   return "aircraft";
+    case SG_AUTOPILOT:  return "autopilot";
+    case SG_IO:         return "io";
+    case SG_CLIPPER:    return "clipper";
+    case SG_NETWORK:    return "network";
+    case SG_ATC:        return "atc";
+    case SG_NASAL:      return "nasal";
+    case SG_INSTR:      return "instruments";
+    case SG_SYSTEMS:    return "systems";
+    case SG_AI:         return "ai";
+    case SG_ENVIRONMENT:return "environment";
+    case SG_SOUND:      return "sound";
+    case SG_NAVAID:     return "navaid";
+    default:            return "unknown";
+    }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+namespace simgear
+{
+
+LogCallback::LogCallback(sgDebugClass c, sgDebugPriority p) :
+	m_class(c),
+	m_priority(p)
+{
+}
+
+bool LogCallback::shouldLog(sgDebugClass c, sgDebugPriority p) const
+{
+	 return ((c & m_class) != 0 && p >= m_priority);
+}
+
+void LogCallback::setLogLevels( sgDebugClass c, sgDebugPriority p )
+{
+	m_priority = p;
+	m_class = c;
+}
+
+} // of namespace simgear
+
+//////////////////////////////////////////////////////////////////////////////
+
+class FileLogCallback : public simgear::LogCallback
+{
+public:
+    FileLogCallback(const std::string& aPath, sgDebugClass c, sgDebugPriority p) :
+	    simgear::LogCallback(c, p),
+        m_file(aPath.c_str(), std::ios_base::out | std::ios_base::trunc)
     {
-        logstream::initGlobalLogstream();
+    }
+    
+    virtual void operator()(sgDebugClass c, sgDebugPriority p, 
+        const char* file, int line, const std::string& message)
+    {
+        if (!shouldLog(c, p)) return;
+        m_file << debugClassToString(c) << ":" << (int) p
+            << ":" << file << ":" << line << ":" << message << std::endl;
+    }
+private:
+    std::ofstream m_file;   
+};
+   
+class StderrLogCallback : public simgear::LogCallback
+{
+public:
+    StderrLogCallback(sgDebugClass c, sgDebugPriority p) :
+		simgear::LogCallback(c, p)
+    {
+#ifdef SG_WINDOWS
+        AllocConsole(); // but only if we want a console
+        freopen("conin$", "r", stdin);
+        freopen("conout$", "w", stdout);
+        freopen("conout$", "w", stderr);
+#endif
+    }
+    
+    virtual void operator()(sgDebugClass c, sgDebugPriority p, 
+        const char* file, int line, const std::string& aMessage)
+    {
+        if (!shouldLog(c, p)) return;
+        
+        fprintf(stderr, "%s\n", aMessage.c_str());
+        //fprintf(stderr, "%s:%d:%s:%d:%s\n", debugClassToString(c), p,
+        //    file, line, aMessage.c_str());
+        fflush(stderr);
     }
 };
-static ignore_me im;
-}
 
-logbuf::logbuf()
+
+#ifdef SG_WINDOWS
+
+class WinDebugLogCallback : public simgear::LogCallback
 {
-//     if ( sbuf == NULL )
-// 	sbuf = cerr.rdbuf();
-}
+public:
+    WinDebugLogCallback(sgDebugClass c, sgDebugPriority p) :
+		simgear::LogCallback(c, p)
+    {
+    }
+    
+    virtual void operator()(sgDebugClass c, sgDebugPriority p, 
+        const char* file, int line, const std::string& aMessage)
+    {
+        if (!shouldLog(c, p)) return;
+        
+        std::ostringstream os;
+		os << debugClassToString(c) << ":" << aMessage << std::endl;
+		OutputDebugStringA(os.str().c_str());
+    }
+};
 
-logbuf::~logbuf()
+#endif
+
+class LogStreamPrivate : public SGThread
 {
-    if ( sbuf )
-	    sync();
-}
+private:
+    /**
+     * storage of a single log entry. Note this is not used for a persistent
+     * store, but rather for short term buffering between the submitting
+     * and output threads.
+     */
+    class LogEntry
+    {
+    public:
+        LogEntry(sgDebugClass c, sgDebugPriority p,
+            const char* f, int l, const std::string& msg) :
+            debugClass(c), debugPriority(p), file(f), line(l),
+                message(msg)
+        {   
+        }
+        
+        sgDebugClass debugClass;
+        sgDebugPriority debugPriority;
+        const char* file;
+        int line;
+        std::string message;
+    };
+    
+    class PauseThread
+    {
+    public:
+        PauseThread(LogStreamPrivate* parent) : m_parent(parent)
+        {
+            m_wasRunning = m_parent->stop();
+        }
+        
+        ~PauseThread()
+        {
+            if (m_wasRunning) {
+                m_parent->startLog();
+            }
+        }
+    private:
+        LogStreamPrivate* m_parent;
+        bool m_wasRunning;
+    };
+public:
+    LogStreamPrivate() :
+        m_logClass(SG_ALL), 
+        m_logPriority(SG_ALERT),
+        m_isRunning(false),
+		m_consoleRequested(false)
+    { 
 
-void
-logbuf::set_sb( streambuf* sb )
+#if !defined(SG_WINDOWS)
+        m_callbacks.push_back(new StderrLogCallback(m_logClass, m_logPriority));
+		m_consoleCallbacks.push_back(m_callbacks.back());
+		m_consoleRequested = true;
+#endif
+
+#if defined (SG_WINDOWS) && !defined(NDEBUG)
+		m_callbacks.push_back(new WinDebugLogCallback(m_logClass, m_logPriority));
+		m_consoleCallbacks.push_back(m_callbacks.back());
+#endif
+    }
+                    
+    SGMutex m_lock;
+    SGBlockingQueue<LogEntry> m_entries;
+    
+    typedef std::vector<simgear::LogCallback*> CallbackVec;
+    CallbackVec m_callbacks;    
+    /// subset of callbacks which correspond to stdout / console,
+	/// and hence should dynamically reflect console logging settings
+	CallbackVec m_consoleCallbacks;
+
+    sgDebugClass m_logClass;
+    sgDebugPriority m_logPriority;
+    bool m_isRunning;
+	bool m_consoleRequested;
+    
+    void startLog()
+    {
+        SGGuard<SGMutex> g(m_lock);
+        if (m_isRunning) return;
+        m_isRunning = true;
+        start();
+    }
+    
+    virtual void run()
+    {
+        while (1) {
+            LogEntry entry(m_entries.pop());
+            // special marker entry detected, terminate the thread since we are
+            // making a configuration change or quitting the app
+            if ((entry.debugClass == SG_NONE) && !strcmp(entry.file, "done")) {
+                return;
+            }
+            
+            // submit to each installed callback in turn
+            BOOST_FOREACH(simgear::LogCallback* cb, m_callbacks) {
+                (*cb)(entry.debugClass, entry.debugPriority,
+                    entry.file, entry.line, entry.message);
+            }           
+        } // of main thread loop
+    }
+    
+    bool stop()
+    {
+        SGGuard<SGMutex> g(m_lock);
+        if (!m_isRunning) {
+            return false;
+        }
+        
+        // log a special marker value, which will cause the thread to wakeup,
+        // and then exit
+        log(SG_NONE, SG_ALERT, "done", -1, "");
+        join();
+        
+        m_isRunning = false;
+        return true;
+    }
+    
+    void addCallback(simgear::LogCallback* cb)
+    {
+        PauseThread pause(this);
+        m_callbacks.push_back(cb);
+    }
+    
+    void removeCallback(simgear::LogCallback* cb)
+    {
+        PauseThread pause(this);
+        CallbackVec::iterator it = std::find(m_callbacks.begin(), m_callbacks.end(), cb);
+        if (it != m_callbacks.end()) {
+            m_callbacks.erase(it);
+        }
+    }
+    
+    void setLogLevels( sgDebugClass c, sgDebugPriority p )
+    {
+        PauseThread pause(this);
+        m_logPriority = p;
+        m_logClass = c;
+		BOOST_FOREACH(simgear::LogCallback* cb, m_consoleCallbacks) {
+	        cb->setLogLevels(c, p);
+		}
+    }
+    
+    bool would_log( sgDebugClass c, sgDebugPriority p ) const
+    {
+        if (p >= SG_INFO) return true;
+        return ((c & m_logClass) != 0 && p >= m_logPriority);
+    }
+    
+    void log( sgDebugClass c, sgDebugPriority p,
+            const char* fileName, int line, const std::string& msg)
+    {
+        LogEntry entry(c, p, fileName, line, msg);
+        m_entries.push(entry);
+    }
+
+	void requestConsole()
+	{
+		PauseThread pause(this);
+		if (m_consoleRequested) {
+			return;
+		}
+
+		m_consoleRequested = true;
+		m_callbacks.push_back(new StderrLogCallback(m_logClass, m_logPriority));
+		m_consoleCallbacks.push_back(m_callbacks.back());
+	}
+};
+
+/////////////////////////////////////////////////////////////////////////////
+
+static logstream* global_logstream = NULL;
+static LogStreamPrivate* global_privateLogstream = NULL;
+
+logstream::logstream()
 {
-    if ( sbuf )
-	    sync();
-
-    sbuf = sb;
-}
-
-void
-logbuf::set_log_level( sgDebugClass c, sgDebugPriority p )
-{
-    logClass = c;
-    logPriority = p;
-}
-
-void
-logbuf::set_log_classes (sgDebugClass c)
-{
-    logClass = c;
-}
-
-sgDebugClass
-logbuf::get_log_classes ()
-{
-    return logClass;
-}
-
-void
-logbuf::set_log_priority (sgDebugPriority p)
-{
-    logPriority = p;
-}
-
-sgDebugPriority
-logbuf::get_log_priority ()
-{
-    return logPriority;
+    global_privateLogstream = new LogStreamPrivate;
+    global_privateLogstream->startLog();
 }
 
 void
 logstream::setLogLevels( sgDebugClass c, sgDebugPriority p )
 {
-    logbuf::set_log_level( c, p );
+    global_privateLogstream->setLogLevels(c, p);
 }
 
-logstream *
-logstream::initGlobalLogstream()
+void
+logstream::addCallback(simgear::LogCallback* cb)
+{   
+    global_privateLogstream->addCallback(cb);
+}
+
+void
+logstream::removeCallback(simgear::LogCallback* cb)
+{   
+    global_privateLogstream->removeCallback(cb);
+}
+
+void
+logstream::log( sgDebugClass c, sgDebugPriority p,
+        const char* fileName, int line, const std::string& msg)
+{
+    global_privateLogstream->log(c, p, fileName, line, msg);
+}
+
+bool
+logstream::would_log( sgDebugClass c, sgDebugPriority p ) const
+{
+    return global_privateLogstream->would_log(c,p);
+}
+
+sgDebugClass
+logstream::get_log_classes() const
+{
+    return global_privateLogstream->m_logClass;
+}
+    
+sgDebugPriority
+logstream::get_log_priority() const
+{
+    return global_privateLogstream->m_logPriority;
+}
+
+void
+logstream::set_log_priority( sgDebugPriority p)
+{
+    global_privateLogstream->setLogLevels(global_privateLogstream->m_logClass, p);
+}
+    
+void
+logstream::set_log_classes( sgDebugClass c)
+{
+    global_privateLogstream->setLogLevels(c, global_privateLogstream->m_logPriority);
+}
+
+logstream&
+sglog()
 {
     // Force initialization of cerr.
     static std::ios_base::Init initializer;
+    
+    // http://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf
+    // in the absence of portable memory barrier ops in Simgear,
+    // let's keep this correct & safe
+    static SGMutex m;
+    SGGuard<SGMutex> g(m);
+    
     if( !global_logstream )
-        global_logstream = new logstream(std::cerr);
-    return global_logstream;
+        global_logstream = new logstream();
+    return *global_logstream;
 }
+
+void
+logstream::logToFile( const SGPath& aPath, sgDebugClass c, sgDebugPriority p )
+{
+    global_privateLogstream->addCallback(new FileLogCallback(aPath.str(), c, p));
+}
+
+namespace simgear
+{
+
+void requestConsole()
+{
+	sglog(); // force creation
+	global_privateLogstream->requestConsole();
+}
+
+} // of namespace simgear 

simgear/debug/logstream.hxx

@@ -26,222 +26,49 @@
 #define _LOGSTREAM_H
 
 #include <simgear/compiler.h>
-
-#ifdef _WIN32
-#  include <windows.h>
-#endif
-
-#include <streambuf>
-#include <ostream>
-#include <cstdio>
-
 #include <simgear/debug/debug_types.h>
 
-using std::streambuf;
-using std::ostream;
-
-//
-// TODO:
-//
-// 1. Change output destination. Done.
-// 2. Make logbuf thread safe.
-// 3. Read environment for default debugClass and debugPriority.
-//
-
-/**
- * logbuf is an output-only streambuf with the ability to disable sets of
- * messages at runtime. Only messages with priority >= logbuf::logPriority
- * and debugClass == logbuf::logClass are output.
- */
-#ifdef SG_NEED_STREAMBUF_HACK
-class logbuf : public __streambuf
-#else
-class logbuf : public std::streambuf
-#endif
+#include <sstream>
+ 
+// forward decls
+class SGPath;
+      
+namespace simgear
+{
+     
+class LogCallback
 {
 public:
-    // logbuf( streambuf* sb ) : sbuf(sb) {}
-    /** Constructor */
-    logbuf();
-
-    /** Destructor */
-    ~logbuf();
-
-    /**
-     * Is logging enabled?
-     * @return true or false*/
-    bool enabled() { return logging_enabled; }
-
-    /**
-     * Set the logging level of subsequent messages.
-     * @param c debug class
-     * @param p priority
-     */
-    void set_log_state( sgDebugClass c, sgDebugPriority p );
-
-    bool would_log( sgDebugClass c, sgDebugPriority p ) const;
-
-    /**
-     * Set the global logging level.
-     * @param c debug class
-     * @param p priority
-     */
-    static void set_log_level( sgDebugClass c, sgDebugPriority p );
-
-
-    /**
-     * Set the allowed logging classes.
-     * @param c All enabled logging classes anded together.
-     */
-    static void set_log_classes (sgDebugClass c);
-
-
-    /**
-     * Get the logging classes currently enabled.
-     * @return All enabled debug logging anded together.
-     */
-    static sgDebugClass get_log_classes ();
-
-
-    /**
-     * Set the logging priority.
-     * @param c The priority cutoff for logging messages.
-     */
-    static void set_log_priority (sgDebugPriority p);
-
-
-    /**
-     * Get the current logging priority.
-     * @return The priority cutoff for logging messages.
-     */
-    static sgDebugPriority get_log_priority ();
-
-
-    /**
-     * Set the stream buffer
-     * @param sb stream buffer
-     */
-    void set_sb( std::streambuf* sb );
-
-#ifdef _WIN32
-    static void has_no_console() { has_console = false; }
-#endif
+    virtual ~LogCallback() {}
+    virtual void operator()(sgDebugClass c, sgDebugPriority p, 
+        const char* file, int line, const std::string& aMessage) = 0;
 
+	void setLogLevels(sgDebugClass c, sgDebugPriority p);
 protected:
+	LogCallback(sgDebugClass c, sgDebugPriority p);
 
-    /** sync/flush */
-    inline virtual int sync();
-
-    /** overflow */
-    int_type overflow( int ch );
-    // int xsputn( const char* s, istreamsize n );
-
+	bool shouldLog(sgDebugClass c, sgDebugPriority p) const;
 private:
-
-    // The streambuf used for actual output. Defaults to cerr.rdbuf().
-    static std::streambuf* sbuf;
-
-    static bool logging_enabled;
-#ifdef _WIN32
-    static bool has_console;
-#endif
-    static sgDebugClass logClass;
-    static sgDebugPriority logPriority;
-
-private:
-
-    // Not defined.
-    logbuf( const logbuf& );
-    void operator= ( const logbuf& );
-};
-
-inline int
-logbuf::sync()
-{
-	return sbuf->pubsync();
-}
-
-inline void
-logbuf::set_log_state( sgDebugClass c, sgDebugPriority p )
-{
-    logging_enabled = ((c & logClass) != 0 && p >= logPriority);
-}
-
-inline bool
-logbuf::would_log( sgDebugClass c, sgDebugPriority p ) const
-{
-    return ((c & logClass) != 0 && p >= logPriority);
-}
-
-inline logbuf::int_type
-logbuf::overflow( int c )
-{
-#ifdef _WIN32
-    if ( logging_enabled ) {
-        if ( !has_console ) {
-            AllocConsole();
-            freopen("conin$", "r", stdin);
-            freopen("conout$", "w", stdout);
-            freopen("conout$", "w", stderr);
-            has_console = true;
-        }
-        return sbuf->sputc(c);
-    }
-    else
-        return EOF == 0 ? 1: 0;
-#else
-    return logging_enabled ? sbuf->sputc(c) : (EOF == 0 ? 1: 0);
-#endif
-}
-
-/**
- * logstream manipulator for setting the log level of a message.
- */
-struct loglevel
-{
-    loglevel( sgDebugClass c, sgDebugPriority p )
-	: logClass(c), logPriority(p) {}
-
-    sgDebugClass logClass;
-    sgDebugPriority logPriority;
+	sgDebugClass m_class;
+	sgDebugPriority m_priority;
 };
 
 /**
- * A helper class that ensures a streambuf and ostream are constructed and
- * destroyed in the correct order.  The streambuf must be created before the
- * ostream but bases are constructed before members.  Thus, making this class
- * a private base of logstream, declared to the left of ostream, we ensure the
- * correct order of construction and destruction.
+ * Helper force a console on platforms where it might optional, when
+ * we need to show a console. This basically means Windows at the
+ * moment - on other plaforms it's a no-op
  */
-struct logstream_base
-{
-    // logstream_base( streambuf* sb ) : lbuf(sb) {}
-    logstream_base() {}
-
-    logbuf lbuf;
-};
+void requestConsole();
+     
+} // of namespace simgear
 
 /**
  * Class to manage the debug logging stream.
  */
-class logstream : private logstream_base, public std::ostream
+class logstream
 {
 public:
-    /**
-     * The default is to send messages to cerr.
-     * @param out output stream
-     */
-    logstream( std::ostream& out )
-	// : logstream_base(out.rdbuf()),
-	: logstream_base(),
-	  std::ostream(&lbuf) { lbuf.set_sb(out.rdbuf());}
-
-    /**
-     * Set the output stream
-     * @param out output stream
-     */
-    void set_output( std::ostream& out ) { lbuf.set_sb( out.rdbuf() ); }
-
+    static void initGlobalLogstream();
     /**
      * Set the global log class and priority level.
      * @param c debug class
@@ -249,41 +76,49 @@ public:
      */
     void setLogLevels( sgDebugClass c, sgDebugPriority p );
 
-    bool would_log(  sgDebugClass c, sgDebugPriority p ) const
-    {
-        return lbuf.would_log( c, p );
-    };
+    bool would_log(  sgDebugClass c, sgDebugPriority p ) const;
+
+    void logToFile( const SGPath& aPath, sgDebugClass c, sgDebugPriority p );
+
+    void set_log_priority( sgDebugPriority p);
+    
+    void set_log_classes( sgDebugClass c);
+    
+    sgDebugClass get_log_classes() const;
+    
+    sgDebugPriority get_log_priority() const;
 
     /**
-     * Output operator to capture the debug level and priority of a message.
-     * @param l log level
+     * the core logging method
      */
-    inline std::ostream& operator<< ( const loglevel& l );
+    void log( sgDebugClass c, sgDebugPriority p,
+            const char* fileName, int line, const std::string& msg);
+
+   /**
+    * \relates logstream
+    * Return the one and only logstream instance.
+    * We use a function instead of a global object so we are assured that cerr
+    * has been initialised.
+    * @return current logstream
+    */
     friend logstream& sglog();
-    static logstream *initGlobalLogstream();
-protected:
-    static logstream *global_logstream;
+    
+    /**
+     * register a logging callback. Note callbacks are run in a
+     * dedicated thread, so callbacks which pass data to other threads
+     * must use appropriate locking.
+     */
+    void addCallback(simgear::LogCallback* cb);
+     
+    void removeCallback(simgear::LogCallback* cb);
+
+private:
+    // constructor
+    logstream();
 };
 
-inline std::ostream&
-logstream::operator<< ( const loglevel& l )
-{
-    lbuf.set_log_state( l.logClass, l.logPriority );
-    return *this;
-}
+logstream& sglog();
 
-/**
- * \relates logstream
- * Return the one and only logstream instance.
- * We use a function instead of a global object so we are assured that cerr
- * has been initialised.
- * @return current logstream
- */
-inline logstream&
-sglog()
-{
-    return *logstream::initGlobalLogstream();
-}
 
 
 /** \def SG_LOG(C,P,M)
@@ -296,10 +131,12 @@ sglog()
 # define SG_LOG(C,P,M)
 #else
 # define SG_LOG(C,P,M) do {                     \
-	logstream& __tmplogstreamref(sglog());                      \
-	if(__tmplogstreamref.would_log(C,P)) {                      \
-        __tmplogstreamref << loglevel(C,P) << M << std::endl; } \
-	} while(0)
+	if(sglog().would_log(C,P)) {                      \
+        std::ostringstream os;                             \
+        os << M;                                       \
+        sglog().log(C, P, __FILE__, __LINE__, os.str()); \
+    } \
+} while(0)
 #endif
 
 #define SG_ORIGIN __FILE__ ":" SG_STRINGIZE(__LINE__)

simgear/environment/metar.cxx

@@ -629,7 +629,7 @@ bool SGMetar::scanWeather()
 	weather = pre + weather + post;
 	weather.erase(weather.length() - 1);
 	_weather.push_back(weather);
-    if( w.phenomena.size() > 0 )
+    if( ! w.phenomena.empty() )
         _weather2.push_back( w );
 	_grpcount++;
 	return true;

simgear/environment/precipitation.hxx

@@ -42,7 +42,6 @@ private:
     float _rain_intensity;
     float _clip_distance;
 	
-    int _wind_dir;
     osg::Vec3 _wind_vec;
 	
     osg::ref_ptr<osgParticle::PrecipitationEffect> _precipitationEffect;

simgear/io/CMakeLists.txt

@@ -15,7 +15,14 @@ set(HEADERS
     sg_socket.hxx
     sg_socket_udp.hxx
     HTTPClient.hxx
+    HTTPFileRequest.hxx
+    HTTPMemoryRequest.hxx
     HTTPRequest.hxx
+    HTTPContentDecode.hxx
+    DAVMultiStatus.hxx
+    SVNRepository.hxx
+    SVNDirectory.hxx
+    SVNReportParser.hxx
     )
 
 set(SOURCES
@@ -31,22 +38,22 @@ set(SOURCES
     sg_socket.cxx
     sg_socket_udp.cxx
     HTTPClient.cxx
+    HTTPFileRequest.cxx
+    HTTPMemoryRequest.cxx
     HTTPRequest.cxx
+    HTTPContentDecode.cxx
+    DAVMultiStatus.cxx
+    SVNRepository.cxx
+    SVNDirectory.cxx
+    SVNReportParser.cxx
     )
 
 simgear_component(io io "${SOURCES}" "${HEADERS}")
 
 if(ENABLE_TESTS)
 
-if (SIMGEAR_SHARED)
-    set(TEST_LIBS SimGearCore)
-else()
-    set(TEST_LIBS SimGearCore
-            ${CMAKE_THREAD_LIBS_INIT}
-            ${WINSOCK_LIBRARY}
-            ${ZLIB_LIBRARY}
-            ${RT_LIBRARY})
-endif()
+add_executable(http_svn http_svn.cxx)
+target_link_libraries(http_svn ${TEST_LIBS})
 
 add_executable(test_sock socktest.cxx)
 target_link_libraries(test_sock ${TEST_LIBS})
@@ -66,4 +73,5 @@ add_executable(test_binobj test_binobj.cxx)
 target_link_libraries(test_binobj ${TEST_LIBS}) 
     
 add_test(binobj ${EXECUTABLE_OUTPUT_PATH}/test_binobj)
+
 endif(ENABLE_TESTS)

simgear/io/DAVMultiStatus.cxx

@@ -0,0 +1,402 @@
+// DAVMultiStatus.cxx -- parser for WebDAV MultiStatus XML data
+//
+// Copyright (C) 2012  James Turner <zakalawe@mac.com>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#ifdef HAVE_CONFIG_H
+#  include <simgear_config.h>
+#endif
+     
+#include "DAVMultiStatus.hxx"
+
+#include <iostream>
+#include <cstring>
+#include <cassert>
+#include <algorithm>
+#include <sstream>
+
+#include <boost/foreach.hpp>
+
+#include "simgear/debug/logstream.hxx"
+#include "simgear/misc/strutils.hxx"
+#include "simgear/structure/exception.hxx"
+
+#ifdef SYSTEM_EXPAT
+#  include <expat.h>
+#else
+#  include "sg_expat.h"     
+#endif
+
+using std::string;
+
+using namespace simgear;
+
+#define DAV_NS "DAV::"
+#define SUBVERSION_DAV_NS "http://subversion.tigris.org/xmlns/dav/"
+
+const char* DAV_MULTISTATUS_TAG = DAV_NS "multistatus";
+const char* DAV_RESPONSE_TAG = DAV_NS "response";
+const char* DAV_PROPSTAT_TAG = DAV_NS "propstat";
+const char* DAV_PROP_TAG = DAV_NS "prop";
+
+const char* DAV_HREF_TAG = DAV_NS "href";
+const char* DAV_RESOURCE_TYPE_TAG = DAV_NS "resourcetype";
+const char* DAV_CONTENT_TYPE_TAG = DAV_NS "getcontenttype";
+const char* DAV_CONTENT_LENGTH_TAG = DAV_NS "getcontentlength";
+const char* DAV_VERSIONNAME_TAG = DAV_NS "version-name";
+const char* DAV_COLLECTION_TAG = DAV_NS "collection";
+const char* DAV_VCC_TAG = DAV_NS "version-controlled-configuration";
+
+const char* SUBVERSION_MD5_CHECKSUM_TAG = SUBVERSION_DAV_NS ":md5-checksum";
+
+DAVResource::DAVResource(const string& href) :
+  _type(Unknown),
+  _url(href),
+  _container(NULL)
+{
+    assert(!href.empty());
+    if (strutils::ends_with(href, "/")) {
+        _url = href.substr(0, _url.size() - 1);
+    }
+}
+
+void DAVResource::setVersionName(const std::string& aVersion)
+{
+  _versionName = aVersion;
+}
+
+void DAVResource::setVersionControlledConfiguration(const std::string& vcc)
+{
+    _vcc = vcc;
+}
+
+void DAVResource::setMD5(const std::string& md5Hex)
+{
+    _md5 = md5Hex;
+}
+
+std::string DAVResource::name() const
+{
+    string::size_type index = _url.rfind('/');
+    if (index != string::npos) {
+        return _url.substr(index + 1);
+    }
+    
+    throw sg_exception("bad DAV resource HREF:" + _url);
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+DAVCollection::DAVCollection(const string& href) :
+  DAVResource(href)
+{
+  _type = DAVResource::Collection;
+}
+
+DAVCollection::~DAVCollection()
+{
+  BOOST_FOREACH(DAVResource* c, _contents) {
+    delete c;
+  }
+}
+
+void DAVCollection::addChild(DAVResource *res)
+{
+  assert(res);
+  if (res->container() == this) {
+    return;
+  }
+  
+  assert(res->container() == NULL);
+  assert(std::find(_contents.begin(), _contents.end(), res) == _contents.end());
+  assert(strutils::starts_with(res->url(), _url));
+  assert(childWithUrl(res->url()) == NULL);
+  
+  res->_container = this;
+  _contents.push_back(res);
+}
+
+void DAVCollection::removeChild(DAVResource* res)
+{
+  assert(res);
+  assert(res->container() == this);
+  
+  res->_container = NULL;
+  DAVResourceList::iterator it = std::find(_contents.begin(), _contents.end(), res);
+  assert(it != _contents.end());
+  _contents.erase(it);
+}
+
+DAVCollection*
+DAVCollection::createChildCollection(const std::string& name)
+{
+    DAVCollection* child = new DAVCollection(urlForChildWithName(name));
+    addChild(child);
+    return child;
+}
+
+DAVResourceList DAVCollection::contents() const
+{
+  return _contents;
+}
+
+DAVResource* DAVCollection::childWithUrl(const string& url) const
+{
+  if (url.empty())
+    return NULL;
+  
+  BOOST_FOREACH(DAVResource* c, _contents) {
+    if (c->url() == url) {
+      return c;
+    }
+  }
+  
+  return NULL;
+}
+
+DAVResource* DAVCollection::childWithName(const string& name) const
+{
+  return childWithUrl(urlForChildWithName(name));
+}
+
+std::string DAVCollection::urlForChildWithName(const std::string& name) const
+{
+  return url() + "/" + name;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+class DAVMultiStatus::DAVMultiStatusPrivate
+{
+public:
+  DAVMultiStatusPrivate() :
+      parserInited(false),
+      valid(false)
+  {
+    rootResource = NULL;
+  }
+  
+  void startElement (const char * name)
+  {
+    if (tagStack.empty()) {
+      if (strcmp(name, DAV_MULTISTATUS_TAG)) {
+        SG_LOG(SG_IO, SG_WARN, "root element is not " <<
+               DAV_MULTISTATUS_TAG << ", got:" << name);
+      } else {
+        
+      }
+    } else {
+      // not at the root element
+      if (tagStack.back() == DAV_MULTISTATUS_TAG) {
+        if (strcmp(name, DAV_RESPONSE_TAG)) {
+          SG_LOG(SG_IO, SG_WARN, "multistatus child is not response: saw:"
+                 << name);
+        }
+      }
+      
+      if (tagStack.back() == DAV_RESOURCE_TYPE_TAG) {
+        if (!strcmp(name, DAV_COLLECTION_TAG)) {
+          currentElementType = DAVResource::Collection;
+        } else {
+          currentElementType = DAVResource::Unknown;
+        }
+      }
+    }
+    
+    tagStack.push_back(name);
+    if (!strcmp(name, DAV_RESPONSE_TAG)) {
+      currentElementType = DAVResource::Unknown;
+      currentElementUrl.clear();
+      currentElementMD5.clear();
+      currentVersionName.clear();
+      currentVCC.clear();
+    }
+  }
+  
+  void endElement (const char * name)
+  {
+    assert(tagStack.back() == name);
+    tagStack.pop_back();
+    
+    if (!strcmp(name, DAV_RESPONSE_TAG)) {
+      // finish complete response
+      currentElementUrl = strutils::strip(currentElementUrl);
+      
+      DAVResource* res = NULL;
+      if (currentElementType == DAVResource::Collection) {
+        DAVCollection* col = new DAVCollection(currentElementUrl);
+        res = col;
+      } else {
+        res = new DAVResource(currentElementUrl);
+      }
+      
+      res->setVersionName(strutils::strip(currentVersionName));
+      res->setVersionControlledConfiguration(currentVCC);
+      if (rootResource &&
+          strutils::starts_with(currentElementUrl, rootResource->url()))
+      {
+        static_cast<DAVCollection*>(rootResource)->addChild(res);
+      }
+      
+      if (!rootResource) {
+        rootResource = res;
+      }
+    }
+  }
+  
+  void data (const char * s, int length)
+  {
+    if (tagStack.back() == DAV_HREF_TAG) {
+      if (tagN(1) == DAV_RESPONSE_TAG) {
+        currentElementUrl += string(s, length);
+      } else if (tagN(1) == DAV_VCC_TAG) {
+        currentVCC += string(s, length);
+      }
+    } else if (tagStack.back() == SUBVERSION_MD5_CHECKSUM_TAG) {
+      currentElementMD5 = string(s, length);
+    } else if (tagStack.back() == DAV_VERSIONNAME_TAG) {
+      currentVersionName = string(s, length);
+    } else if (tagStack.back() == DAV_CONTENT_LENGTH_TAG) {
+      std::istringstream is(string(s, length));
+      is >> currentElementLength;
+    }
+  }
+  
+  void pi (const char * target, const char * data) {}
+  
+  string tagN(const unsigned int n) const
+  {
+    size_t sz = tagStack.size();
+    if (n >= sz) {
+      return string();
+    }
+    
+    return tagStack[sz - (1 + n)];
+  }
+  
+  bool parserInited;
+  bool valid;
+  XML_Parser xmlParser;
+  DAVResource* rootResource;
+  
+  // in-flight data
+  string_list tagStack;
+  DAVResource::Type currentElementType;
+  string currentElementUrl,
+    currentVersionName,
+    currentVCC;
+  int currentElementLength;
+  string currentElementMD5;
+};
+
+
+////////////////////////////////////////////////////////////////////////
+// Static callback functions for Expat.
+////////////////////////////////////////////////////////////////////////
+
+#define VISITOR static_cast<DAVMultiStatus::DAVMultiStatusPrivate *>(userData)
+
+static void
+start_element (void * userData, const char * name, const char ** atts)
+{
+  VISITOR->startElement(name);
+}
+
+static void
+end_element (void * userData, const char * name)
+{
+  VISITOR->endElement(name);
+}
+
+static void
+character_data (void * userData, const char * s, int len)
+{
+  VISITOR->data(s, len);
+}
+
+static void
+processing_instruction (void * userData,
+                        const char * target,
+                        const char * data)
+{
+  VISITOR->pi(target, data);
+}
+
+#undef VISITOR
+
+///////////////////////////////////////////////////////////////////////////////
+
+DAVMultiStatus::DAVMultiStatus() :
+_d(new DAVMultiStatusPrivate)
+{
+  
+}
+
+DAVMultiStatus::~DAVMultiStatus()
+{
+  
+}
+
+void DAVMultiStatus::parseXML(const char* data, int size)
+{
+  if (!_d->parserInited) {
+    _d->xmlParser = XML_ParserCreateNS(0, ':');
+    XML_SetUserData(_d->xmlParser, _d.get());
+    XML_SetElementHandler(_d->xmlParser, start_element, end_element);
+    XML_SetCharacterDataHandler(_d->xmlParser, character_data);
+    XML_SetProcessingInstructionHandler(_d->xmlParser, processing_instruction);
+    _d->parserInited = true;
+  }
+  
+  if (!XML_Parse(_d->xmlParser, data, size, false)) {
+    SG_LOG(SG_IO, SG_WARN, "DAV parse error:" << XML_ErrorString(XML_GetErrorCode(_d->xmlParser))
+           << " at line:" << XML_GetCurrentLineNumber(_d->xmlParser)
+           << " column " << XML_GetCurrentColumnNumber(_d->xmlParser));
+    
+    XML_ParserFree(_d->xmlParser);
+    _d->parserInited = false;
+    _d->valid = false;
+  }
+}
+
+void DAVMultiStatus::finishParse()
+{
+  if (_d->parserInited) {
+    if (!XML_Parse(_d->xmlParser, NULL, 0, true)) {
+        SG_LOG(SG_IO, SG_WARN, "DAV parse error:" << XML_ErrorString(XML_GetErrorCode(_d->xmlParser))
+               << " at line:" << XML_GetCurrentLineNumber(_d->xmlParser)
+               << " column " << XML_GetCurrentColumnNumber(_d->xmlParser));
+        _d->valid = false;
+    } else {
+        _d->valid = true;
+    }
+    XML_ParserFree(_d->xmlParser);
+  }
+  
+  _d->parserInited = false;
+}
+
+DAVResource* DAVMultiStatus::resource()
+{
+  return _d->rootResource;
+}
+
+bool DAVMultiStatus::isValid() const
+{
+    return _d->valid;
+}
+
+

simgear/io/DAVMultiStatus.hxx

@@ -0,0 +1,143 @@
+// DAVMultiStatus.hxx -- parser for WebDAV MultiStatus XML data
+//
+// Copyright (C) 2012  James Turner <zakalawe@mac.com>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+
+#ifndef SG_IO_DAVMULTISTATUS_HXX
+#define SG_IO_DAVMULTISTATUS_HXX
+
+#include <string>
+#include <vector>
+#include <memory> // for auto_ptr
+
+namespace simgear
+{
+
+class DAVCollection;
+
+class DAVResource
+{
+public:
+    DAVResource(const std::string& url);
+    virtual ~DAVResource() { }
+  
+    typedef enum {
+        Unknown = 0,
+        Collection = 1
+    } Type;
+        
+    const Type type() const
+        { return _type; }
+    
+    const std::string& url() const
+        { return _url; }
+
+    std::string name() const;
+
+    /**
+     * SVN servers use this field to expose the head revision
+     * of the resource, which is useful
+     */
+    const std::string& versionName() const
+      { return _versionName; }
+
+    void setVersionName(const std::string& aVersion);
+
+    DAVCollection* container() const
+        { return _container; }
+    
+    virtual bool isCollection() const
+        { return false; }
+
+    void setVersionControlledConfiguration(const std::string& vcc);
+    const std::string& versionControlledConfiguration() const
+        { return _vcc; }
+    
+    void setMD5(const std::string& md5Hex);
+    const std::string& md5() const
+        { return _md5; }
+protected:
+    friend class DAVCollection;
+  
+    Type _type;
+    std::string _url;
+    std::string _versionName;
+    std::string _vcc;
+    std::string _md5;
+    DAVCollection* _container;
+};
+
+typedef std::vector<DAVResource*> DAVResourceList;
+
+class DAVCollection : public DAVResource
+{
+public:
+  DAVCollection(const std::string& url);
+  virtual ~DAVCollection();
+  
+  DAVResourceList contents() const;
+  
+  void addChild(DAVResource* res);
+  void removeChild(DAVResource* res);
+  
+  DAVCollection* createChildCollection(const std::string& name);
+  
+  /**
+   * find the collection member with the specified URL, or return NULL
+   * if no such member of this collection exists.
+   */
+  DAVResource* childWithUrl(const std::string& url) const;
+     
+  /**
+   * find the collection member with the specified name, or return NULL
+   */
+  DAVResource* childWithName(const std::string& name) const;
+   
+  /**
+   * wrapper around URL manipulation
+   */
+  std::string urlForChildWithName(const std::string& name) const;
+  
+  virtual bool isCollection() const
+  { return true; }
+private:
+  DAVResourceList _contents;
+};
+
+class DAVMultiStatus
+{
+public:
+    DAVMultiStatus();
+    ~DAVMultiStatus();
+    
+    // incremental XML parsing
+    void parseXML(const char* data, int size);
+    
+    void finishParse();
+    
+    bool isValid() const;
+    
+    DAVResource* resource();
+  
+  class DAVMultiStatusPrivate;
+private:
+    std::auto_ptr<DAVMultiStatusPrivate> _d;
+};
+
+} // of namespace simgear
+
+#endif // of SG_IO_DAVMULTISTATUS_HXX

simgear/io/HTTPClient.cxx

@@ -1,22 +1,47 @@
+/**
+ * \file HTTPClient.cxx - simple HTTP client engine for SimHear
+ */
+
+// Written by James Turner
+//
+// Copyright (C) 2013  James Turner  <zakalawe@mac.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
 #include "HTTPClient.hxx"
+#include "HTTPFileRequest.hxx"
 
 #include <sstream>
 #include <cassert>
+#include <cstdlib> // rand()
 #include <list>
-#include <iostream>
 #include <errno.h>
+#include <map>
+#include <stdexcept>
 
 #include <boost/foreach.hpp>
 #include <boost/algorithm/string/case_conv.hpp>
 
-#include <zlib.h>
-
 #include <simgear/io/sg_netChat.hxx>
-#include <simgear/io/lowlevel.hxx>
+#include <simgear/io/HTTPContentDecode.hxx>
 #include <simgear/misc/strutils.hxx>
 #include <simgear/compiler.h>
 #include <simgear/debug/logstream.hxx>
 #include <simgear/timing/timestamp.hxx>
+#include <simgear/structure/exception.hxx>
 
 #if defined( HAVE_VERSION_H ) && HAVE_VERSION_H
 #include "version.h"
@@ -26,10 +51,6 @@
 #  endif
 #endif
 
-using std::string;
-using std::stringstream;
-using std::vector;
-
 namespace simgear
 {
 
@@ -39,19 +60,31 @@ namespace HTTP
 extern const int DEFAULT_HTTP_PORT = 80;
 const char* CONTENT_TYPE_URL_ENCODED = "application/x-www-form-urlencoded";
 const unsigned int MAX_INFLIGHT_REQUESTS = 32;
-const int ZLIB_DECOMPRESS_BUFFER_SIZE = 32 * 1024;
-const int ZLIB_INFLATE_WINDOW_BITS = -MAX_WBITS;
-  
-// see http://www.ietf.org/rfc/rfc1952.txt for these values and
-// detailed description of the logic 
-const int GZIP_HEADER_ID1 = 31;
-const int GZIP_HEADER_ID2 = 139;
-const int GZIP_HEADER_METHOD_DEFLATE = 8;
-const int GZIP_HEADER_SIZE = 10;
-const int GZIP_HEADER_FEXTRA = 1 << 2;
-const int GZIP_HEADER_FNAME = 1 << 3;
-const int GZIP_HEADER_COMMENT = 1 << 4;
-const int GZIP_HEADER_CRC = 1 << 1;
+
+class Connection;
+typedef std::multimap<std::string, Connection*> ConnectionDict;
+typedef std::list<Request_ptr> RequestList;
+
+class Client::ClientPrivate
+{
+public:
+    std::string userAgent;
+    std::string proxy;
+    int proxyPort;
+    std::string proxyAuth;
+    NetChannelPoller poller;
+    unsigned int maxConnections;
+    
+    RequestList pendingRequests;
+    
+// connections by host (potentially more than one)
+    ConnectionDict connections;
+    
+    SGTimeStamp timeTransferSample;
+    unsigned int bytesTransferred;
+    unsigned int lastTransferRate;
+    uint64_t totalBytesDownloaded;
+};
   
 class Connection : public NetChat
 {
@@ -59,26 +92,28 @@ public:
     Connection(Client* pr) :
         client(pr),
         state(STATE_CLOSED),
-        port(DEFAULT_HTTP_PORT),
-        zlibInflateBuffer(NULL),
-        zlibInflateBufferSize(0),
-        zlibOutputBuffer(NULL)
+        port(DEFAULT_HTTP_PORT)
     {
-        
     }
     
     virtual ~Connection()
     {
-      if (zlibInflateBuffer) {
-        free(zlibInflateBuffer);
-      }
-      
-      if (zlibOutputBuffer) {
-        free(zlibOutputBuffer);
-      }
+    }
+
+    virtual void handleBufferRead (NetBuffer& buffer)
+    {
+      if( !activeRequest || !activeRequest->isComplete() )
+        return NetChat::handleBufferRead(buffer);
+
+      // Request should be aborted (signaled by setting its state to complete).
+
+      // force the state to GETTING_BODY, to simplify logic in
+      // responseComplete and handleClose
+      state = STATE_GETTING_BODY;
+      responseComplete();
     }
   
-    void setServer(const string& h, short p)
+    void setServer(const std::string& h, short p)
     {
         host = h;
         port = p;
@@ -109,6 +144,7 @@ public:
             SG_LOG(SG_IO, SG_INFO, "HTTP socket error");
             activeRequest->setFailure(error, "socket error");
             activeRequest = NULL;
+            _contentDecoder.reset();
         }
     
         state = STATE_SOCKET_ERROR;
@@ -117,13 +153,28 @@ public:
     virtual void handleClose()
     {      
         NetChat::handleClose();
-        
-        if ((state == STATE_GETTING_BODY) && activeRequest) {
+
+    // closing of the connection from the server side when getting the body,
+        bool canCloseState = (state == STATE_GETTING_BODY);
+        if (canCloseState && activeRequest) {
         // force state here, so responseComplete can avoid closing the 
         // socket again
             state =  STATE_CLOSED;
             responseComplete();
         } else {
+            if (activeRequest) {
+                activeRequest->setFailure(500, "server closed connection");
+                // remove the failed request from sentRequests, so it does 
+                // not get restored
+                RequestList::iterator it = std::find(sentRequests.begin(), 
+                    sentRequests.end(), activeRequest);
+                if (it != sentRequests.end()) {
+                    sentRequests.erase(it);
+                }
+                activeRequest = NULL;
+                _contentDecoder.reset();
+            }
+            
             state = STATE_CLOSED;
         }
       
@@ -138,18 +189,37 @@ public:
       sentRequests.clear();
     }
     
+    void handleTimeout()
+    {
+        NetChat::handleError(ETIMEDOUT);
+        if (activeRequest) {
+            SG_LOG(SG_IO, SG_DEBUG, "HTTP socket timeout");
+            activeRequest->setFailure(ETIMEDOUT, "socket timeout");
+            activeRequest = NULL;
+            _contentDecoder.reset();
+        }
+        
+        state = STATE_SOCKET_ERROR;
+    }
+    
     void queueRequest(const Request_ptr& r)
     {
-      queuedRequests.push_back(r);
-      tryStartNextRequest();
+        queuedRequests.push_back(r);
+        tryStartNextRequest();
     }
     
     void beginResponse()
     {
-      assert(!sentRequests.empty());
-      
-      activeRequest = sentRequests.front();      
-      activeRequest->responseStart(buffer);
+        assert(!sentRequests.empty());
+        assert(state == STATE_WAITING_FOR_RESPONSE);
+        
+        activeRequest = sentRequests.front();
+        try {
+            activeRequest->responseStart(buffer);
+        } catch (sg_exception& e) {
+            handleError(EIO);
+        }
+        
       state = STATE_GETTING_HEADERS;
       buffer.clear();
       if (activeRequest->responseCode() == 204) {
@@ -162,11 +232,15 @@ public:
 
       bodyTransferSize = -1;
       chunkedTransfer = false;
-      contentGZip = contentDeflate = false;
+      _contentDecoder.reset();
     }
   
     void tryStartNextRequest()
     {
+      while( !queuedRequests.empty()
+          && queuedRequests.front()->isComplete() )
+        queuedRequests.pop_front();
+
       if (queuedRequests.empty()) {
         idleTime.stamp();
         return;
@@ -186,28 +260,29 @@ public:
       }
      
       Request_ptr r = queuedRequests.front();
-      requestBodyBytesToSend = r->requestBodyLength();
-          
-      stringstream headerData;
-      string path = r->path();
+      r->requestStart();
+
+      std::stringstream headerData;
+      std::string path = r->path();
       assert(!path.empty());
-      string query = r->query();
-      string bodyData;
+      std::string query = r->query();
+      std::string bodyData;
       
       if (!client->proxyHost().empty()) {
           path = r->scheme() + "://" + r->host() + r->path();
       }
 
-      if (r->requestBodyType() == CONTENT_TYPE_URL_ENCODED) {
+      if (r->bodyType() == CONTENT_TYPE_URL_ENCODED) {
           headerData << r->method() << " " << path << " HTTP/1.1\r\n";
           bodyData = query.substr(1); // URL-encode, drop the leading '?'
           headerData << "Content-Type:" << CONTENT_TYPE_URL_ENCODED << "\r\n";
           headerData << "Content-Length:" << bodyData.size() << "\r\n";
       } else {
           headerData << r->method() << " " << path << query << " HTTP/1.1\r\n";
-          if (requestBodyBytesToSend >= 0) {
-            headerData << "Content-Length:" << requestBodyBytesToSend << "\r\n";
-            headerData << "Content-Type:" << r->requestBodyType() << "\r\n";
+          if( r->hasBodyData() )
+          {
+            headerData << "Content-Length:" << r->bodyLength() << "\r\n";
+            headerData << "Content-Type:" << r->bodyType() << "\r\n";
           }
       }
       
@@ -218,8 +293,8 @@ public:
           headerData << "Proxy-Authorization: " << client->proxyAuth() << "\r\n";
       }
 
-      BOOST_FOREACH(string h, r->requestHeaders()) {
-          headerData << h << ": " << r->header(h) << "\r\n";
+      BOOST_FOREACH(const StringMap::value_type& h, r->requestHeaders()) {
+          headerData << h.first << ": " << h.second << "\r\n";
       }
 
       headerData << "\r\n"; // final CRLF to terminate the headers
@@ -229,163 +304,67 @@ public:
       
       bool ok = push(headerData.str().c_str());
       if (!ok) {
+          SG_LOG(SG_IO, SG_WARN, "HTTPClient: over-stuffed the socket");
           // we've over-stuffed the socket, give up for now, let things
           // drain down before trying to start any more requests.
           return;
       }
-      
-      while (requestBodyBytesToSend > 0) {
-        char buf[4096];
-        int len = 4096;
-        r->getBodyData(buf, len);
-        if (len > 0) {
-          requestBodyBytesToSend -= len;
-          if (!bufferSend(buf, len)) {
-            SG_LOG(SG_IO, SG_WARN, "overflow the HTTP::Connection output buffer");
-            state = STATE_SOCKET_ERROR;
-            return;
+
+      if( r->hasBodyData() )
+        for(size_t body_bytes_sent = 0; body_bytes_sent < r->bodyLength();)
+        {
+          char buf[4096];
+          size_t len = r->getBodyData(buf, body_bytes_sent, 4096);
+          if( len )
+          {
+            if( !bufferSend(buf, len) )
+            {
+              SG_LOG(SG_IO,
+                     SG_WARN,
+                     "overflow the HTTP::Connection output buffer");
+              state = STATE_SOCKET_ERROR;
+              return;
+            }
+            body_bytes_sent += len;
+          }
+          else
+          {
+            SG_LOG(SG_IO,
+                   SG_WARN,
+                   "HTTP asynchronous request body generation is unsupported");
+            break;
           }
-        } else {
-          SG_LOG(SG_IO, SG_WARN, "asynchronous request body generation is unsupported");
-          break;
         }
-      }
       
-      //std::cout << "did send request:" << r->url() << std::endl;
-    // successfully sent, remove from queue, and maybe send the next
+      //   SG_LOG(SG_IO, SG_INFO, "did start request:" << r->url() <<
+      //       "\n\t @ " << reinterpret_cast<void*>(r.ptr()) <<
+      //      "\n\t on connection " << this);
+      // successfully sent, remove from queue, and maybe send the next
       queuedRequests.pop_front();
       sentRequests.push_back(r);
-      
-    // pipelining, let's maybe send the next request right away
+      state = STATE_WAITING_FOR_RESPONSE;
+        
+      // pipelining, let's maybe send the next request right away
       tryStartNextRequest();
     }
     
     virtual void collectIncomingData(const char* s, int n)
     {
         idleTime.stamp();
-        if ((state == STATE_GETTING_BODY) || (state == STATE_GETTING_CHUNKED_BYTES)) {
-          if (contentGZip || contentDeflate) {
-            expandCompressedData(s, n);
-          } else {
-            activeRequest->processBodyBytes(s, n);
-          }
-        } else {
-            buffer += string(s, n);
-        }
+        client->receivedBytes(static_cast<unsigned int>(n));
+
+        if(   (state == STATE_GETTING_BODY)
+           || (state == STATE_GETTING_CHUNKED_BYTES) )
+          _contentDecoder.receivedBytes(s, n);
+        else
+          buffer.append(s, n);
     }
 
-    
-    void expandCompressedData(const char* s, int n)
-    {
-      int reqSize = n + zlib.avail_in;
-      if (reqSize > zlibInflateBufferSize) {
-      // reallocate
-        unsigned char* newBuf = (unsigned char*) malloc(reqSize);
-        memcpy(newBuf, zlib.next_in, zlib.avail_in);
-        memcpy(newBuf + zlib.avail_in, s, n);
-        free(zlibInflateBuffer);
-        zlibInflateBuffer = newBuf;
-        zlibInflateBufferSize = reqSize;
-      } else {
-      // important to use memmove here, since it's very likely
-      // the source and destination ranges overlap
-        memmove(zlibInflateBuffer, zlib.next_in, zlib.avail_in);
-        memcpy(zlibInflateBuffer + zlib.avail_in, s, n);
-      }
-            
-      zlib.next_in = (unsigned char*) zlibInflateBuffer;
-      zlib.avail_in = reqSize;
-      zlib.next_out = zlibOutputBuffer;
-      zlib.avail_out = ZLIB_DECOMPRESS_BUFFER_SIZE;
-      
-      if (contentGZip) {
-        // we clear this down to contentDeflate once the GZip header has been seen
-        if (reqSize < GZIP_HEADER_SIZE) {
-          return; // need more header bytes
-        }
-        
-        if ((zlibInflateBuffer[0] != GZIP_HEADER_ID1) ||
-            (zlibInflateBuffer[1] != GZIP_HEADER_ID2) ||
-            (zlibInflateBuffer[2] != GZIP_HEADER_METHOD_DEFLATE))
-        {
-          return; // invalid GZip header
-        }
-        
-        char flags = zlibInflateBuffer[3];
-        int gzipHeaderSize =  GZIP_HEADER_SIZE;
-        if (flags & GZIP_HEADER_FEXTRA) {
-          gzipHeaderSize += 2;
-          if (reqSize < gzipHeaderSize) {
-            return; // need more header bytes
-          }
-          
-          unsigned short extraHeaderBytes = *(reinterpret_cast<unsigned short*>(zlibInflateBuffer + GZIP_HEADER_FEXTRA));
-          if ( sgIsBigEndian() ) {
-              sgEndianSwap( &extraHeaderBytes );
-          }
-          
-          gzipHeaderSize += extraHeaderBytes;
-          if (reqSize < gzipHeaderSize) {
-            return; // need more header bytes
-          }
-        }
-        
-        if (flags & GZIP_HEADER_FNAME) {
-          gzipHeaderSize++;
-          while (gzipHeaderSize <= reqSize) {
-            if (zlibInflateBuffer[gzipHeaderSize-1] == 0) {
-              break; // found terminating NULL character
-            }
-          }
-        }
-        
-        if (flags & GZIP_HEADER_COMMENT) {
-          gzipHeaderSize++;
-          while (gzipHeaderSize <= reqSize) {
-            if (zlibInflateBuffer[gzipHeaderSize-1] == 0) {
-              break; // found terminating NULL character
-            }
-          }
-        }
-        
-        if (flags & GZIP_HEADER_CRC) {
-          gzipHeaderSize += 2;
-        }
-        
-        if (reqSize < gzipHeaderSize) {
-          return; // need more header bytes
-        }
-        
-        zlib.next_in += gzipHeaderSize;
-        zlib.avail_in = reqSize - gzipHeaderSize;
-      // now we've processed the GZip header, can decode as deflate
-        contentGZip = false;
-        contentDeflate = true;
-      }
-      
-      int writtenSize = 0;
-      do {
-        int result = inflate(&zlib, Z_NO_FLUSH);
-        if (result == Z_OK || result == Z_STREAM_END) {
-              
-        } else {
-          SG_LOG(SG_IO, SG_WARN, "got Zlib error:" << result);
-          return;
-        }
-            
-        writtenSize = ZLIB_DECOMPRESS_BUFFER_SIZE - zlib.avail_out;
-      } while ((writtenSize == 0) && (zlib.avail_in > 0));
-    
-      if (writtenSize > 0) {
-        activeRequest->processBodyBytes((const char*) zlibOutputBuffer, writtenSize);
-      }
-    }
-    
     virtual void foundTerminator(void)
     {
         idleTime.stamp();
         switch (state) {
-        case STATE_IDLE:
+        case STATE_WAITING_FOR_RESPONSE:
             beginResponse();
             break;
             
@@ -405,6 +384,7 @@ public:
         case STATE_GETTING_CHUNKED_BYTES:
             setTerminator("\r\n");
             state = STATE_GETTING_CHUNKED;
+            buffer.clear();
             break;
             
 
@@ -413,6 +393,9 @@ public:
             buffer.clear();
             break;
         
+        case STATE_IDLE:
+            SG_LOG(SG_IO, SG_WARN, "HTTP got data in IDLE state, bad server?");
+                
         default:
             break;
         }
@@ -424,6 +407,7 @@ public:
             return false;
         }
         
+        assert(sentRequests.empty());
         return idleTime.elapsedMSec() > 1000 * 10; // ten seconds
     }
   
@@ -445,6 +429,11 @@ public:
     {
       return !queuedRequests.empty() && (sentRequests.size() < MAX_INFLIGHT_REQUESTS);
     }
+    
+    bool isActive() const
+    {
+        return !queuedRequests.empty() || !sentRequests.empty();
+    }
 private:
     bool connectToHost()
     {
@@ -465,37 +454,9 @@ private:
     
     void processHeader()
     {
-        string h = strutils::simplify(buffer);
+        std::string h = strutils::simplify(buffer);
         if (h.empty()) { // blank line terminates headers
             headersComplete();
-            
-            if (contentGZip || contentDeflate) {
-                memset(&zlib, 0, sizeof(z_stream));
-                if (!zlibOutputBuffer) {
-                    zlibOutputBuffer = (unsigned char*) malloc(ZLIB_DECOMPRESS_BUFFER_SIZE);
-                }
-            
-                // NULLs means we'll get default alloc+free methods
-                // which is absolutely fine
-                zlib.avail_out = ZLIB_DECOMPRESS_BUFFER_SIZE;
-                zlib.next_out = zlibOutputBuffer;
-                if (inflateInit2(&zlib, ZLIB_INFLATE_WINDOW_BITS) != Z_OK) {
-                  SG_LOG(SG_IO, SG_WARN, "inflateInit2 failed");
-                }
-            }
-          
-            if (chunkedTransfer) {
-                state = STATE_GETTING_CHUNKED;
-            } else if (noMessageBody || (bodyTransferSize == 0)) {
-                // force the state to GETTING_BODY, to simplify logic in
-                // responseComplete and handleClose
-                state = STATE_GETTING_BODY;
-                responseComplete();
-            } else {
-                setByteCount(bodyTransferSize); // may be -1, that's fine              
-                state = STATE_GETTING_BODY;
-            }
-            
             return;
         }
               
@@ -505,9 +466,9 @@ private:
             return;
         }
         
-        string key = strutils::simplify(buffer.substr(0, colonPos));
-        string lkey = boost::to_lower_copy(key);
-        string value = strutils::strip(buffer.substr(colonPos + 1));
+        std::string key = strutils::simplify(buffer.substr(0, colonPos));
+        std::string lkey = boost::to_lower_copy(key);
+        std::string value = strutils::strip(buffer.substr(colonPos + 1));
         
         // only consider these if getting headers (as opposed to trailers 
         // of a chunked transfer)
@@ -524,20 +485,14 @@ private:
             } else if (lkey == "transfer-encoding") {
                 processTransferEncoding(value);
             } else if (lkey == "content-encoding") {
-              if (value == "gzip") {
-                contentGZip = true;
-              } else if (value == "deflate") {
-                contentDeflate = true;
-              } else if (value != "identity") {
-                SG_LOG(SG_IO, SG_WARN, "unsupported content encoding:" << value);
-              }
+                _contentDecoder.setEncoding(value);
             }
         }
     
         activeRequest->responseHeader(lkey, value);
     }
     
-    void processTransferEncoding(const string& te)
+    void processTransferEncoding(const std::string& te)
     {
         if (te == "chunked") {
             chunkedTransfer = true;
@@ -553,7 +508,7 @@ private:
             // blank line after chunk data
             return;
         }
-        
+                
         int chunkSize = 0;
         int semiPos = buffer.find(';');
         if (semiPos >= 0) {
@@ -588,17 +543,25 @@ private:
     void headersComplete()
     {
         activeRequest->responseHeadersComplete();
+        _contentDecoder.initWithRequest(activeRequest);
+      
+        if (chunkedTransfer) {
+            state = STATE_GETTING_CHUNKED;
+        } else if (noMessageBody || (bodyTransferSize == 0)) {
+            // force the state to GETTING_BODY, to simplify logic in
+            // responseComplete and handleClose
+            state = STATE_GETTING_BODY;
+            responseComplete();
+        } else {
+            setByteCount(bodyTransferSize); // may be -1, that's fine
+            state = STATE_GETTING_BODY;
+        }
     }
     
     void responseComplete()
     {
-      //std::cout << "responseComplete:" << activeRequest->url() << std::endl;
-        activeRequest->responseComplete();
-        client->requestFinished(this);
-      
-        if (contentDeflate) {
-          inflateEnd(&zlib);
-        }
+        Request_ptr completedRequest = activeRequest;
+        _contentDecoder.finish();
       
         assert(sentRequests.front() == activeRequest);
         sentRequests.pop_front();
@@ -609,21 +572,29 @@ private:
             if (doClose) {
           // this will bring us into handleClose() above, which updates
           // state to STATE_CLOSED
-            close();
+              close();
               
           // if we have additional requests waiting, try to start them now
-            tryStartNextRequest();
-          }
+              tryStartNextRequest();
+            }
         }
         
-      if (state != STATE_CLOSED)  {
-        state = STATE_IDLE;
-      }
-      setTerminator("\r\n");
+        if (state != STATE_CLOSED)  {
+            state = sentRequests.empty() ? STATE_IDLE : STATE_WAITING_FOR_RESPONSE;
+        }
+        
+    // notify request after we change state, so this connection is idle
+    // if completion triggers other requests (which is likely)
+        //   SG_LOG(SG_IO, SG_INFO, "*** responseComplete:" << activeRequest->url());
+        completedRequest->responseComplete();
+        client->requestFinished(this);
+        
+        setTerminator("\r\n");
     }
     
     enum ConnectionState {
         STATE_IDLE = 0,
+        STATE_WAITING_FOR_RESPONSE,
         STATE_GETTING_HEADERS,
         STATE_GETTING_BODY,
         STATE_GETTING_CHUNKED,
@@ -636,74 +607,187 @@ private:
     Client* client;
     Request_ptr activeRequest;
     ConnectionState state;
-    string host;
+    std::string host;
     short port;
     std::string buffer;
     int bodyTransferSize;
     SGTimeStamp idleTime;
     bool chunkedTransfer;
     bool noMessageBody;
-    int requestBodyBytesToSend;
-  
-    z_stream zlib;
-    unsigned char* zlibInflateBuffer;
-    int zlibInflateBufferSize;
-    unsigned char* zlibOutputBuffer;
-    bool contentGZip, contentDeflate;
-  
-    std::list<Request_ptr> queuedRequests;
-    std::list<Request_ptr> sentRequests;
+    
+    RequestList queuedRequests;
+    RequestList sentRequests;
+    
+    ContentDecoder _contentDecoder;
 };
 
-Client::Client()
+Client::Client() :
+    d(new ClientPrivate)
 {
+    d->proxyPort = 0;
+    d->maxConnections = 4;
+    d->bytesTransferred = 0;
+    d->lastTransferRate = 0;
+    d->timeTransferSample.stamp();
+    d->totalBytesDownloaded = 0;
+    
     setUserAgent("SimGear-" SG_STRINGIZE(SIMGEAR_VERSION));
 }
 
+Client::~Client()
+{
+}
+
+void Client::setMaxConnections(unsigned int maxCon)
+{
+    if (maxCon < 1) {
+        throw sg_range_exception("illegal HTTP::Client::setMaxConnections value");
+    }
+    
+    d->maxConnections = maxCon;
+}
+
 void Client::update(int waitTimeout)
 {
-    NetChannel::poll(waitTimeout);
-        
-    ConnectionDict::iterator it = _connections.begin();
-    for (; it != _connections.end(); ) {
-        if (it->second->hasIdleTimeout() || it->second->hasError() ||
-            it->second->hasErrorTimeout())
+    if (!d->poller.hasChannels() && (waitTimeout > 0)) {
+        SGTimeStamp::sleepForMSec(waitTimeout);
+    } else {
+        d->poller.poll(waitTimeout);
+    }
+    
+    bool waitingRequests = !d->pendingRequests.empty();
+    ConnectionDict::iterator it = d->connections.begin();
+    for (; it != d->connections.end(); ) {
+        Connection* con = it->second;
+        if (con->hasIdleTimeout() || 
+            con->hasError() ||
+            con->hasErrorTimeout() ||
+            (!con->isActive() && waitingRequests))
         {
+            if (con->hasErrorTimeout()) {
+                // tell the connection we're timing it out
+                con->handleTimeout();
+            }
+            
         // connection has been idle for a while, clean it up
-        // (or has an error condition, again clean it up)
+        // (or if we have requests waiting for a different host,
+        // or an error condition
             ConnectionDict::iterator del = it++;
             delete del->second;
-            _connections.erase(del);
+            d->connections.erase(del);
         } else {
             if (it->second->shouldStartNext()) {
                 it->second->tryStartNextRequest();
             }
-            
             ++it;
         }
-    } // of connecion iteration
+    } // of connection iteration
+    
+    if (waitingRequests && (d->connections.size() < d->maxConnections)) {
+        RequestList waiting(d->pendingRequests);
+        d->pendingRequests.clear();
+        
+        // re-submit all waiting requests in order; this takes care of
+        // finding multiple pending items targetted to the same (new)
+        // connection
+        BOOST_FOREACH(Request_ptr req, waiting) {
+            makeRequest(req);
+        }
+    }
 }
 
 void Client::makeRequest(const Request_ptr& r)
 {
-    string host = r->host();
+    if( r->isComplete() )
+      return;
+
+    if( r->url().find("://") == std::string::npos ) {
+        r->setFailure(EINVAL, "malformed URL");
+        return;
+    }
+
+    if( r->url().find("http://") != 0 ) {
+        r->setFailure(EINVAL, "only HTTP protocol is supported");
+        return;
+    }
+    
+    std::string host = r->host();
     int port = r->port();
-    if (!_proxy.empty()) {
-        host = _proxy;
-        port = _proxyPort;
+    if (!d->proxy.empty()) {
+        host = d->proxy;
+        port = d->proxyPort;
     }
     
-    stringstream ss;
+    Connection* con = NULL;
+    std::stringstream ss;
     ss << host << "-" << port;
-    string connectionId = ss.str();
-    
-    if (_connections.find(connectionId) == _connections.end()) {
-        Connection* con = new Connection(this);
-        con->setServer(host, port);
-        _connections[connectionId] = con;
+    std::string connectionId = ss.str();
+    bool havePending = !d->pendingRequests.empty();
+    bool atConnectionsLimit = d->connections.size() >= d->maxConnections;
+    ConnectionDict::iterator consEnd = d->connections.end();
+     
+    // assign request to an existing Connection.
+    // various options exist here, examined in order
+    ConnectionDict::iterator it = d->connections.find(connectionId);
+    if (atConnectionsLimit && (it == consEnd)) {
+        // maximum number of connections active, queue this request
+        // when a connection goes inactive, we'll start this one            
+        d->pendingRequests.push_back(r);
+        return;
     }
     
-    _connections[connectionId]->queueRequest(r);
+    // scan for an idle Connection to the same host (likely if we're
+    // retrieving multiple resources from the same host in quick succession)
+    // if we have pending requests (waiting for a free Connection), then
+    // force new requests on this id to always use the first Connection
+    // (instead of the random selection below). This ensures that when
+    // there's pressure on the number of connections to keep alive, one
+    // host can't DoS every other.
+    int count = 0;
+    for (; (it != consEnd) && (it->first == connectionId); ++it, ++count) {
+        if (havePending || !it->second->isActive()) {
+            con = it->second;
+            break;
+        }
+    }
+    
+    if (!con && atConnectionsLimit) {
+        // all current connections are busy (active), and we don't
+        // have free connections to allocate, so let's assign to
+        // an existing one randomly. Ideally we'd used whichever one will
+        // complete first but we don't have that info.
+        int index = rand() % count;
+        for (it = d->connections.find(connectionId); index > 0; --index) { ; }
+        con = it->second;
+    }
+    
+    // allocate a new connection object
+    if (!con) {
+        con = new Connection(this);
+        con->setServer(host, port);
+        d->poller.addChannel(con);
+        d->connections.insert(d->connections.end(), 
+            ConnectionDict::value_type(connectionId, con));
+    }
+    
+    con->queueRequest(r);
+}
+
+//------------------------------------------------------------------------------
+FileRequestRef Client::save( const std::string& url,
+                             const std::string& filename )
+{
+  FileRequestRef req = new FileRequest(url, filename);
+  makeRequest(req);
+  return req;
+}
+
+//------------------------------------------------------------------------------
+MemoryRequestRef Client::load(const std::string& url)
+{
+  MemoryRequestRef req = new MemoryRequest(url);
+  makeRequest(req);
+  return req;
 }
 
 void Client::requestFinished(Connection* con)
@@ -711,16 +795,80 @@ void Client::requestFinished(Connection* con)
     
 }
 
-void Client::setUserAgent(const string& ua)
+void Client::setUserAgent(const std::string& ua)
 {
-    _userAgent = ua;
+    d->userAgent = ua;
 }
 
-void Client::setProxy(const string& proxy, int port, const string& auth)
+const std::string& Client::userAgent() const
 {
-    _proxy = proxy;
-    _proxyPort = port;
-    _proxyAuth = auth;
+    return d->userAgent;
+}
+    
+const std::string& Client::proxyHost() const
+{
+    return d->proxy;
+}
+    
+const std::string& Client::proxyAuth() const
+{
+    return d->proxyAuth;
+}
+
+void Client::setProxy( const std::string& proxy,
+                       int port,
+                       const std::string& auth )
+{
+    d->proxy = proxy;
+    d->proxyPort = port;
+    d->proxyAuth = auth;
+}
+
+bool Client::hasActiveRequests() const
+{
+    ConnectionDict::const_iterator it = d->connections.begin();
+    for (; it != d->connections.end(); ++it) {
+        if (it->second->isActive()) return true;
+    }
+    
+    return false;
+}
+
+void Client::receivedBytes(unsigned int count)
+{
+    d->bytesTransferred += count;
+    d->totalBytesDownloaded += count;
+}
+    
+unsigned int Client::transferRateBytesPerSec() const
+{
+    unsigned int e = d->timeTransferSample.elapsedMSec();
+    if (e > 400) {
+        // too long a window, ignore
+        d->timeTransferSample.stamp();
+        d->bytesTransferred = 0;
+        d->lastTransferRate = 0;
+        return 0;
+    }
+    
+    if (e < 100) { // avoid really narrow windows
+        return d->lastTransferRate;
+    }
+    
+    unsigned int ratio = (d->bytesTransferred * 1000) / e;
+    // run a low-pass filter
+    unsigned int smoothed = ((400 - e) * d->lastTransferRate) + (e * ratio);
+    smoothed /= 400;
+        
+    d->timeTransferSample.stamp();
+    d->bytesTransferred = 0;
+    d->lastTransferRate = smoothed;
+    return smoothed;
+}
+
+uint64_t Client::totalBytesDownloaded() const
+{
+    return d->totalBytesDownloaded;
 }
 
 } // of namespace HTTP

simgear/io/HTTPClient.hxx

@@ -1,9 +1,34 @@
+/**
+ * \file HTTPClient.hxx - simple HTTP client engine for SimHear
+ */
+
+// Written by James Turner
+//
+// Copyright (C) 2013  James Turner  <zakalawe@mac.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
 #ifndef SG_HTTP_CLIENT_HXX
 #define SG_HTTP_CLIENT_HXX
 
-#include <map>
+#include <memory> // for std::auto_ptr
+#include <stdint.h> // for uint_64t
 
-#include <simgear/io/HTTPRequest.hxx>
+#include <simgear/io/HTTPFileRequest.hxx>
+#include <simgear/io/HTTPMemoryRequest.hxx>
 
 namespace simgear
 {
@@ -11,42 +36,78 @@ namespace simgear
 namespace HTTP
 {
 
+// forward decls
 class Connection;
-
+    
 class Client
 {
 public:
     Client();
+    ~Client();
     
     void update(int waitTimeout = 0);
     
     void makeRequest(const Request_ptr& r);
-    
+
+    /**
+     * Download a resource and save it to a file.
+     *
+     * @param url       The resource to download
+     * @param filename  Path to the target file
+     * @param data      Data for POST request
+     */
+    FileRequestRef save( const std::string& url,
+                         const std::string& filename );
+
+    /**
+     * Request a resource and keep it in memory.
+     *
+     * @param url   The resource to download
+     */
+    MemoryRequestRef load(const std::string& url);
+
     void setUserAgent(const std::string& ua);
     void setProxy(const std::string& proxy, int port, const std::string& auth = "");
     
-    const std::string& userAgent() const
-        { return _userAgent; }
+    /**
+     * Specify the maximum permitted simultaneous connections
+     * (default value is 1)
+     */
+    void setMaxConnections(unsigned int maxCons);
+    
+    const std::string& userAgent() const;
         
-    const std::string& proxyHost() const
-        { return _proxy; }
+    const std::string& proxyHost() const;
         
-    const std::string& proxyAuth() const
-        { return _proxyAuth; }
+    const std::string& proxyAuth() const;
+    
+    /**
+     * predicate, check if at least one connection is active, with at
+     * least one request active or queued.
+     */
+    bool hasActiveRequests() const;
+    
+    /**
+     * crude tracking of bytes-per-second transferred over the socket.
+     * suitable for user feedback and rough profiling, nothing more.
+     */
+    unsigned int transferRateBytesPerSec() const;
+    
+    /**
+     * total bytes downloaded by this HTTP client, for bandwidth usage
+     * monitoring
+     */
+    uint64_t totalBytesDownloaded() const;
 private:
     void requestFinished(Connection* con);
     
+    void receivedBytes(unsigned int count);
+    
     friend class Connection;
     friend class Request;
     
-    std::string _userAgent;
-    std::string _proxy;
-    int _proxyPort;
-    std::string _proxyAuth;
-    
-// connections by host
-    typedef std::map<std::string, Connection*> ConnectionDict;
-    ConnectionDict _connections;
+    class ClientPrivate;
+    std::auto_ptr<ClientPrivate> d;
 };
 
 } // of namespace HTTP

simgear/io/HTTPContentDecode.cxx

@@ -0,0 +1,269 @@
+// Written by James Turner
+//
+// Copyright (C) 2013  James Turner  <zakalawe@mac.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#include "HTTPContentDecode.hxx"
+
+#include <cassert>
+#include <cstdlib> // rand()
+#include <cstring> // for memset, memcpy
+
+#include <simgear/debug/logstream.hxx>
+#include <simgear/structure/exception.hxx>
+#include <simgear/io/lowlevel.hxx> // for sgEndian stuff
+
+namespace simgear
+{
+
+namespace HTTP
+{
+
+    const int ZLIB_DECOMPRESS_BUFFER_SIZE = 32 * 1024;
+    const int ZLIB_INFLATE_WINDOW_BITS = -MAX_WBITS;
+  
+    // see http://www.ietf.org/rfc/rfc1952.txt for these values and
+    // detailed description of the logic 
+    const int GZIP_HEADER_ID1 = 31;
+    const int GZIP_HEADER_ID2 = 139;
+    const int GZIP_HEADER_METHOD_DEFLATE = 8;
+    const unsigned int GZIP_HEADER_SIZE = 10;
+    const int GZIP_HEADER_FEXTRA = 1 << 2;
+    const int GZIP_HEADER_FNAME = 1 << 3;
+    const int GZIP_HEADER_COMMENT = 1 << 4;
+    const int GZIP_HEADER_CRC = 1 << 1;
+    
+ContentDecoder::ContentDecoder() :
+    _output(NULL),
+    _zlib(NULL),
+    _input(NULL),
+    _inputAllocated(0),
+    _inputSize(0)
+{
+}
+
+ContentDecoder::~ContentDecoder()
+{
+    free(_output);
+    free(_input);
+    free(_zlib);
+}
+
+void ContentDecoder::setEncoding(const std::string& encoding)
+{
+    if (encoding == "gzip") {
+      _contentDeflate = true;
+      _needGZipHeader = true;
+    } else if (encoding == "deflate") {
+      _contentDeflate = true;
+      _needGZipHeader = false;
+    } else if (encoding != "identity") {
+      SG_LOG(SG_IO, SG_WARN, "unsupported content encoding:" << encoding);
+    }
+}
+
+void ContentDecoder::reset()
+{
+    _request = NULL;
+    _contentDeflate = false;
+    _needGZipHeader = false;
+    _inputSize = 0;
+}
+
+void ContentDecoder::initWithRequest(Request_ptr req)
+{
+    _request = req;
+    if (!_contentDeflate) {
+        return;
+    }
+
+    if (!_zlib) {
+        _zlib = (z_stream*) malloc(sizeof(z_stream));
+    }
+    
+    memset(_zlib, 0, sizeof(z_stream));
+    if (!_output) {
+         _output = (unsigned char*) malloc(ZLIB_DECOMPRESS_BUFFER_SIZE);
+    }
+    
+    _inputSize = 0;
+    // NULLs means we'll get default alloc+free methods
+    // which is absolutely fine
+    _zlib->avail_out = ZLIB_DECOMPRESS_BUFFER_SIZE;
+    _zlib->next_out = _output;
+    if (inflateInit2(_zlib, ZLIB_INFLATE_WINDOW_BITS) != Z_OK) {
+      SG_LOG(SG_IO, SG_WARN, "inflateInit2 failed");
+    }
+}
+
+void ContentDecoder::finish()
+{    
+    if (_contentDeflate) {
+        runDecoder();
+      inflateEnd(_zlib);
+    }
+}
+
+void ContentDecoder::receivedBytes(const char* n, size_t s)
+{
+    if (!_contentDeflate) {
+        _request->processBodyBytes(n, s);
+        return;
+    }    
+    
+// allocate more space if needed (this will only happen rarely once the
+// buffer has hit something proportionate to the server's compression
+// window size)
+    size_t requiredSize = _inputSize + s;
+    if (requiredSize > _inputAllocated) {
+        reallocateInputBuffer(requiredSize);
+    }
+    
+// copy newly recieved bytes into the buffer
+    memcpy(_input + _inputSize, n, s);
+    _inputSize += s;
+    
+    if (_needGZipHeader && !consumeGZipHeader()) {
+        // still waiting on the full GZIP header, so done
+        return;
+    }
+    
+    runDecoder();
+}
+
+void ContentDecoder::consumeBytes(size_t consumed)
+{    
+    assert(_inputSize >= consumed);
+// move existing (consumed) bytes down
+    if (consumed > 0) {
+        size_t newSize = _inputSize - consumed;
+        memmove(_input, _input + consumed, newSize);
+        _inputSize = newSize;
+    }
+}
+
+void ContentDecoder::reallocateInputBuffer(size_t newSize)
+{    
+    _input = (unsigned char*) realloc(_input, newSize);
+    _inputAllocated = newSize;
+}
+
+void ContentDecoder::runDecoder()
+{
+    _zlib->next_in = (unsigned char*) _input;
+    _zlib->avail_in = _inputSize;
+    int writtenSize;
+    
+    // loop, running zlib() inflate and sending output bytes to
+    // our request body handler. Keep calling inflate until no bytes are
+    // written, and ZLIB has consumed all available input
+    do {
+        _zlib->next_out = _output;
+        _zlib->avail_out = ZLIB_DECOMPRESS_BUFFER_SIZE;
+      int result = inflate(_zlib, Z_NO_FLUSH);
+      if (result == Z_OK || result == Z_STREAM_END) {
+          // nothing to do
+      } else if (result == Z_BUF_ERROR) {
+          // transient error, fall through
+      } else {
+        //  _error = result;          
+        return;
+      }
+          
+      writtenSize = ZLIB_DECOMPRESS_BUFFER_SIZE - _zlib->avail_out;      
+      if (writtenSize > 0) {
+          _request->processBodyBytes((char*) _output, writtenSize);
+      }
+      
+      if (result == Z_STREAM_END) {
+          break;
+      }
+    } while ((_zlib->avail_in > 0) || (writtenSize > 0));
+    
+    // update input buffers based on what we consumed
+    consumeBytes(_inputSize - _zlib->avail_in);
+}
+
+bool ContentDecoder::consumeGZipHeader()
+{    
+    size_t avail = _inputSize;
+    if (avail < GZIP_HEADER_SIZE) {
+      return false; // need more header bytes
+    }
+    
+    if ((_input[0] != GZIP_HEADER_ID1) ||
+        (_input[1] != GZIP_HEADER_ID2) ||
+        (_input[2] != GZIP_HEADER_METHOD_DEFLATE))
+    {
+      return false; // invalid GZip header
+    }
+    
+    char flags = _input[3];
+    unsigned int gzipHeaderSize =  GZIP_HEADER_SIZE;
+    if (flags & GZIP_HEADER_FEXTRA) {
+      gzipHeaderSize += 2;
+      if (avail < gzipHeaderSize) {
+        return false; // need more header bytes
+      }
+      
+      unsigned short extraHeaderBytes = *(reinterpret_cast<unsigned short*>(_input + GZIP_HEADER_FEXTRA));
+      if ( sgIsBigEndian() ) {
+          sgEndianSwap( &extraHeaderBytes );
+      }
+      
+      gzipHeaderSize += extraHeaderBytes;
+      if (avail < gzipHeaderSize) {
+        return false; // need more header bytes
+      }
+    }
+
+#if 0
+    if (flags & GZIP_HEADER_FNAME) {
+      gzipHeaderSize++;
+      while (gzipHeaderSize <= avail) {
+        if (_input[gzipHeaderSize-1] == 0) {
+          break; // found terminating NULL character
+        }
+      }
+    }
+    
+    if (flags & GZIP_HEADER_COMMENT) {
+      gzipHeaderSize++;
+      while (gzipHeaderSize <= avail) {
+        if (_input[gzipHeaderSize-1] == 0) {
+          break; // found terminating NULL character
+        }
+      }
+    }
+#endif
+        
+    if (flags & GZIP_HEADER_CRC) {
+      gzipHeaderSize += 2;
+    }
+    
+    if (avail < gzipHeaderSize) {
+      return false; // need more header bytes
+    }
+    
+    consumeBytes(gzipHeaderSize);
+    _needGZipHeader = false;
+    return true;
+}
+
+} // of namespace HTTP
+
+} // of namespace simgear

simgear/io/HTTPContentDecode.hxx

@@ -0,0 +1,72 @@
+// Written by James Turner
+//
+// Copyright (C) 2013  James Turner  <zakalawe@mac.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#ifndef SG_HTTP_CONTENT_DECODER_HXX
+#define SG_HTTP_CONTENT_DECODER_HXX
+
+#include <string>
+
+#include <zlib.h>
+
+#include <simgear/io/HTTPRequest.hxx>
+
+
+namespace simgear
+{
+
+namespace HTTP
+{
+
+class ContentDecoder
+{
+public:
+    ContentDecoder();
+    ~ContentDecoder();
+    
+    void reset();
+    
+    void initWithRequest(Request_ptr req);
+    
+    void finish();
+    
+    void setEncoding(const std::string& encoding);
+    
+    void receivedBytes(const char* n, size_t s);
+
+private:
+    bool consumeGZipHeader();
+    void runDecoder();
+    
+    void consumeBytes(size_t consumed);
+    void reallocateInputBuffer(size_t newSize);
+    
+    Request_ptr _request;
+    unsigned char* _output;
+    
+    z_stream* _zlib;
+    unsigned char* _input;
+    size_t _inputAllocated, _inputSize;
+    bool _contentDeflate, _needGZipHeader;
+};
+
+} // of namespace HTTP
+
+} // of namespace simgear
+
+#endif // of SG_HTTP_CONTENT_DECODER_HXX

simgear/io/HTTPFileRequest.cxx

@@ -0,0 +1,91 @@
+// HTTP request writing response to a file.
+//
+// Copyright (C) 2013  Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+
+#include "HTTPFileRequest.hxx"
+#include <simgear/debug/logstream.hxx>
+#include <simgear/misc/sg_path.hxx>
+
+namespace simgear
+{
+namespace HTTP
+{
+
+  //----------------------------------------------------------------------------
+  FileRequest::FileRequest(const std::string& url, const std::string& path):
+    Request(url, "GET"),
+    _filename(path)
+  {
+
+  }
+
+  //----------------------------------------------------------------------------
+  void FileRequest::responseHeadersComplete()
+  {
+    Request::responseHeadersComplete();
+
+    if( responseCode() != 200 )
+      return setFailure(responseCode(), responseReason());
+
+    if( !_filename.empty() )
+    {
+      // TODO validate path? (would require to expose fgValidatePath somehow to
+      //      simgear)
+      SGPath path(_filename);
+      path.create_dir(0755);
+
+      _file.open(_filename.c_str(), std::ios::binary | std::ios::trunc);
+    }
+
+    if( !_file )
+    {
+      SG_LOG
+      (
+        SG_IO,
+        SG_WARN,
+        "HTTP::FileRequest: failed to open file '" << _filename << "'"
+      );
+
+      abort("Failed to open file.");
+    }
+  }
+
+  //----------------------------------------------------------------------------
+  void FileRequest::gotBodyData(const char* s, int n)
+  {
+    if( !_file )
+    {
+      SG_LOG
+      (
+        SG_IO,
+        SG_DEBUG,
+        "HTTP::FileRequest: received data for closed file '" << _filename << "'"
+      );
+      return;
+    }
+
+    _file.write(s, n);
+  }
+
+  //----------------------------------------------------------------------------
+  void FileRequest::onAlways()
+  {
+    _file.close();
+  }
+
+} // namespace HTTP
+} // namespace simgear

simgear/io/HTTPFileRequest.hxx

@@ -0,0 +1,56 @@
+///@file HTTP request writing response to a file.
+//
+// Copyright (C) 2013  Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+
+#ifndef SG_HTTP_FILEREQUEST_HXX_
+#define SG_HTTP_FILEREQUEST_HXX_
+
+#include "HTTPRequest.hxx"
+#include <fstream>
+
+namespace simgear
+{
+namespace HTTP
+{
+
+  class FileRequest:
+    public Request
+  {
+    public:
+
+      /**
+       *
+       * @param url     Adress to download from
+       * @param path    Path to file for saving response
+       */
+      FileRequest(const std::string& url, const std::string& path);
+
+    protected:
+      std::string   _filename;
+      std::ofstream _file;
+
+      virtual void responseHeadersComplete();
+      virtual void gotBodyData(const char* s, int n);
+      virtual void onAlways();
+  };
+
+  typedef SGSharedPtr<FileRequest> FileRequestRef;
+
+} // namespace HTTP
+} // namespace simgear
+
+#endif /* SG_HTTP_FILEREQUEST_HXX_ */

simgear/io/HTTPMemoryRequest.cxx

@@ -0,0 +1,55 @@
+// HTTP request keeping response in memory.
+//
+// Copyright (C) 2013  Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+
+#include "HTTPMemoryRequest.hxx"
+
+namespace simgear
+{
+namespace HTTP
+{
+
+  //----------------------------------------------------------------------------
+  MemoryRequest::MemoryRequest(const std::string& url):
+    Request(url, "GET")
+  {
+
+  }
+
+  //----------------------------------------------------------------------------
+  const std::string& MemoryRequest::responseBody() const
+  {
+    return _response;
+  }
+
+  //----------------------------------------------------------------------------
+  void MemoryRequest::responseHeadersComplete()
+  {
+    Request::responseHeadersComplete();
+
+    if( responseLength() )
+      _response.reserve( responseLength() );
+  }
+
+  //----------------------------------------------------------------------------
+  void MemoryRequest::gotBodyData(const char* s, int n)
+  {
+    _response.append(s, n);
+  }
+
+} // namespace HTTP
+} // namespace simgear

simgear/io/HTTPMemoryRequest.hxx

@@ -0,0 +1,58 @@
+///@file HTTP request keeping response in memory.
+//
+// Copyright (C) 2013  Thomas Geymayer <tomgey@gmail.com>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
+
+#ifndef SG_HTTP_MEMORYREQUEST_HXX_
+#define SG_HTTP_MEMORYREQUEST_HXX_
+
+#include "HTTPRequest.hxx"
+#include <fstream>
+
+namespace simgear
+{
+namespace HTTP
+{
+
+  class MemoryRequest:
+    public Request
+  {
+    public:
+
+      /**
+       *
+       * @param url     Adress to download from
+       */
+      MemoryRequest(const std::string& url);
+
+      /**
+       * Body contents of server response.
+       */
+      const std::string& responseBody() const;
+
+    protected:
+      std::string   _response;
+
+      virtual void responseHeadersComplete();
+      virtual void gotBodyData(const char* s, int n);
+  };
+
+  typedef SGSharedPtr<MemoryRequest> MemoryRequestRef;
+
+} // namespace HTTP
+} // namespace simgear
+
+#endif /* SG_HTTP_MEMORYREQUEST_HXX_ */

simgear/io/HTTPRequest.cxx

@@ -1,99 +1,190 @@
 #include "HTTPRequest.hxx"
 
-#include <simgear/misc/strutils.hxx>
 #include <simgear/compiler.h>
 #include <simgear/debug/logstream.hxx>
-
-using std::string;
-using std::map;
+#include <simgear/misc/strutils.hxx>
+#include <simgear/props/props_io.hxx>
+#include <simgear/structure/exception.hxx>
 
 namespace simgear
 {
-
 namespace HTTP
 {
 
 extern const int DEFAULT_HTTP_PORT;
 
-Request::Request(const string& url, const string method) :
-    _method(method),
-    _url(url),
-    _responseVersion(HTTP_VERSION_UNKNOWN),
-    _responseStatus(0),
-    _responseLength(0),
-    _receivedBodyBytes(0),
-    _willClose(false)
+//------------------------------------------------------------------------------
+Request::Request(const std::string& url, const std::string method):
+  _method(method),
+  _url(url),
+  _responseVersion(HTTP_VERSION_UNKNOWN),
+  _responseStatus(0),
+  _responseLength(0),
+  _receivedBodyBytes(0),
+  _ready_state(UNSENT),
+  _willClose(false)
 {
-    
+
 }
 
+//------------------------------------------------------------------------------
 Request::~Request()
 {
-    
+
 }
 
-void Request::setUrl(const string& url)
+//------------------------------------------------------------------------------
+Request* Request::done(const Callback& cb)
 {
-    _url = url;
+  if( _ready_state == DONE )
+    cb(this);
+  else
+    _cb_done = cb;
+
+  return this;
 }
 
-string_list Request::requestHeaders() const
+//------------------------------------------------------------------------------
+Request* Request::fail(const Callback& cb)
 {
-    string_list r;
-    return r;
+  if( _ready_state == FAILED )
+    cb(this);
+  else
+    _cb_fail = cb;
+
+  return this;
 }
 
-string Request::header(const std::string& name) const
+//------------------------------------------------------------------------------
+Request* Request::always(const Callback& cb)
 {
-    return string();
+  if( isComplete() )
+    cb(this);
+  else
+    _cb_always = cb;
+
+  return this;
 }
 
-void Request::responseStart(const string& r)
+//------------------------------------------------------------------------------
+void Request::setBodyData( const std::string& data,
+                           const std::string& type )
+{
+  _request_data = data;
+  _request_media_type = type;
+
+  if( !data.empty() && _method == "GET" )
+    _method = "POST";
+}
+
+//----------------------------------------------------------------------------
+void Request::setBodyData(const SGPropertyNode* data)
+{
+  if( !data )
+    setBodyData("");
+
+  std::stringstream buf;
+  writeProperties(buf, data, true);
+
+  setBodyData(buf.str(), "application/xml");
+}
+
+//------------------------------------------------------------------------------
+void Request::setUrl(const std::string& url)
+{
+  _url = url;
+}
+
+//------------------------------------------------------------------------------
+void Request::requestStart()
+{
+  setReadyState(OPENED);
+}
+
+//------------------------------------------------------------------------------
+Request::HTTPVersion decodeHTTPVersion(const std::string& v)
+{
+  if( v == "HTTP/1.1" ) return Request::HTTP_1_1;
+  if( v == "HTTP/1.0" ) return Request::HTTP_1_0;
+  if( strutils::starts_with(v, "HTTP/0.") ) return Request::HTTP_0_x;
+  return Request::HTTP_VERSION_UNKNOWN;
+}
+
+//------------------------------------------------------------------------------
+void Request::responseStart(const std::string& r)
 {
     const int maxSplit = 2; // HTTP/1.1 nnn reason-string
     string_list parts = strutils::split(r, NULL, maxSplit);
     if (parts.size() != 3) {
-        SG_LOG(SG_IO, SG_WARN, "HTTP::Request: malformed response start:" << r);
-        setFailure(400, "malformed HTTP response header");
-        return;
+        throw sg_io_exception("bad HTTP response");
     }
     
-    _responseVersion = decodeVersion(parts[0]);    
+    _responseVersion = decodeHTTPVersion(parts[0]);
     _responseStatus = strutils::to_int(parts[1]);
     _responseReason = parts[2];
 }
 
-void Request::responseHeader(const string& key, const string& value)
+//------------------------------------------------------------------------------
+void Request::responseHeader(const std::string& key, const std::string& value)
 {
-    if (key == "connection") {
-        _willClose = (value.find("close") != string::npos);
-    }
-    
-    _responseHeaders[key] = value;
+  if( key == "connection" )
+    _willClose = (value.find("close") != std::string::npos);
+
+  _responseHeaders[key] = value;
 }
 
+//------------------------------------------------------------------------------
 void Request::responseHeadersComplete()
 {
-    // no op
-}
-
-void Request::processBodyBytes(const char* s, int n)
-{
-    _receivedBodyBytes += n;
-    gotBodyData(s, n);
-}
-
-void Request::gotBodyData(const char* s, int n)
-{
-
+  setReadyState(HEADERS_RECEIVED);
 }
 
+//------------------------------------------------------------------------------
 void Request::responseComplete()
 {
-    
+  if( !isComplete() )
+    setReadyState(DONE);
 }
-    
-string Request::scheme() const
+
+//------------------------------------------------------------------------------
+void Request::gotBodyData(const char* s, int n)
+{
+  setReadyState(LOADING);
+}
+
+//------------------------------------------------------------------------------
+void Request::onDone()
+{
+
+}
+
+//------------------------------------------------------------------------------
+void Request::onFail()
+{
+  SG_LOG
+  (
+    SG_IO,
+    SG_INFO,
+    "request failed:" << url() << " : "
+                      << responseCode() << "/" << responseReason()
+  );
+}
+
+//------------------------------------------------------------------------------
+void Request::onAlways()
+{
+
+}
+
+//------------------------------------------------------------------------------
+void Request::processBodyBytes(const char* s, int n)
+{
+  _receivedBodyBytes += n;
+  gotBodyData(s, n);
+}
+
+//------------------------------------------------------------------------------
+std::string Request::scheme() const
 {
     int firstColon = url().find(":");
     if (firstColon > 0) {
@@ -102,10 +193,11 @@ string Request::scheme() const
     
     return ""; // couldn't parse scheme
 }
-    
-string Request::path() const
+
+//------------------------------------------------------------------------------
+std::string Request::path() const
 {
-    string u(url());
+    std::string u(url());
     int schemeEnd = u.find("://");
     if (schemeEnd < 0) {
         return ""; // couldn't parse scheme
@@ -127,10 +219,10 @@ string Request::path() const
     return u.substr(hostEnd, query - hostEnd);
 }
 
-
-string Request::query() const
+//------------------------------------------------------------------------------
+std::string Request::query() const
 {
-  string u(url());
+  std::string u(url());
   int query = u.find('?');
   if (query < 0) {
     return "";  //no query string found
@@ -139,105 +231,159 @@ string Request::query() const
   return u.substr(query);   //includes question mark
 }
 
-
-
-string Request::host() const
+//------------------------------------------------------------------------------
+std::string Request::host() const
 {
-    string hp(hostAndPort());
-    int colonPos = hp.find(':');
-    if (colonPos >= 0) {
-        return hp.substr(0, colonPos); // trim off the colon and port
-    } else {
-        return hp; // no port specifier
-    }
+  std::string hp(hostAndPort());
+  int colonPos = hp.find(':');
+  if (colonPos >= 0) {
+      return hp.substr(0, colonPos); // trim off the colon and port
+  } else {
+      return hp; // no port specifier
+  }
 }
 
+//------------------------------------------------------------------------------
 unsigned short Request::port() const
 {
-    string hp(hostAndPort());
-    int colonPos = hp.find(':');
-    if (colonPos >= 0) {
-        return (unsigned short) strutils::to_int(hp.substr(colonPos + 1));
-    } else {
-        return DEFAULT_HTTP_PORT;
-    }
+  std::string hp(hostAndPort());
+  int colonPos = hp.find(':');
+  if (colonPos >= 0) {
+      return (unsigned short) strutils::to_int(hp.substr(colonPos + 1));
+  } else {
+      return DEFAULT_HTTP_PORT;
+  }
 }
 
-string Request::hostAndPort() const
+//------------------------------------------------------------------------------
+std::string Request::hostAndPort() const
 {
-    string u(url());
-    int schemeEnd = u.find("://");
-    if (schemeEnd < 0) {
-        return ""; // couldn't parse scheme
-    }
-    
-    int hostEnd = u.find('/', schemeEnd + 3);
-    if (hostEnd < 0) { // all remainder of URL is host
-        return u.substr(schemeEnd + 3);
-    }
-    
-    return u.substr(schemeEnd + 3, hostEnd - (schemeEnd + 3));
+  std::string u(url());
+  int schemeEnd = u.find("://");
+  if (schemeEnd < 0) {
+      return ""; // couldn't parse scheme
+  }
+
+  int hostEnd = u.find('/', schemeEnd + 3);
+  if (hostEnd < 0) { // all remainder of URL is host
+      return u.substr(schemeEnd + 3);
+  }
+
+  return u.substr(schemeEnd + 3, hostEnd - (schemeEnd + 3));
 }
 
+//------------------------------------------------------------------------------
 void Request::setResponseLength(unsigned int l)
 {
-    _responseLength = l;
+  _responseLength = l;
 }
 
+//------------------------------------------------------------------------------
 unsigned int Request::responseLength() const
 {
-// if the server didn't supply a content length, use the number
-// of bytes we actually received (so far)
-    if ((_responseLength == 0) && (_receivedBodyBytes > 0)) {
-        return _receivedBodyBytes;
-    }
-    
-    return _responseLength;
+  // if the server didn't supply a content length, use the number
+  // of bytes we actually received (so far)
+  if( (_responseLength == 0) && (_receivedBodyBytes > 0) )
+    return _receivedBodyBytes;
+
+  return _responseLength;
 }
 
+//------------------------------------------------------------------------------
 void Request::setFailure(int code, const std::string& reason)
 {
-    _responseStatus = code;
-    _responseReason = reason;
-    failed();
+  _responseStatus = code;
+  _responseReason = reason;
+  setReadyState(FAILED);
 }
 
-void Request::failed()
+//------------------------------------------------------------------------------
+void Request::setReadyState(ReadyState state)
 {
-    // no-op in base class
-    SG_LOG(SG_IO, SG_INFO, "request failed:" << url());
+  _ready_state = state;
+  if( state == DONE )
+  {
+    // Finish C++ part of request to ensure everything is finished (for example
+    // files and streams are closed) before calling any callback (possibly using
+    // such files)
+    onDone();
+    onAlways();
+
+    if( _cb_done )
+      _cb_done(this);
+  }
+  else if( state == FAILED )
+  {
+    onFail();
+    onAlways();
+
+    if( _cb_fail )
+      _cb_fail(this);
+  }
+  else
+    return;
+
+  if( _cb_always )
+    _cb_always(this);
 }
 
-Request::HTTPVersion Request::decodeVersion(const string& v)
+//------------------------------------------------------------------------------
+void Request::abort()
 {
-    if (v == "HTTP/1.1") return HTTP_1_1;
-    if (v == "HTTP/1.0") return HTTP_1_0;
-    if (strutils::starts_with(v, "HTTP/0.")) return HTTP_0_x;
-    return HTTP_VERSION_UNKNOWN;
+  abort("Request aborted.");
 }
 
+//----------------------------------------------------------------------------
+void Request::abort(const std::string& reason)
+{
+  if( isComplete() )
+    return;
+
+  setFailure(-1, reason);
+  _willClose = true;
+}
+
+//------------------------------------------------------------------------------
 bool Request::closeAfterComplete() const
 {
-// for non HTTP/1.1 connections, assume server closes
-    return _willClose || (_responseVersion != HTTP_1_1);
-}
-  
-int Request::requestBodyLength() const
-{
-  return -1;
+  // for non HTTP/1.1 connections, assume server closes
+  return _willClose || (_responseVersion != HTTP_1_1);
 }
 
-std::string Request::requestBodyType() const
+//------------------------------------------------------------------------------
+bool Request::isComplete() const
 {
-    return "text/plain";
+  return _ready_state == DONE || _ready_state == FAILED;
 }
-  
-void Request::getBodyData(char*, int& count) const
+
+//------------------------------------------------------------------------------
+bool Request::hasBodyData() const
 {
-  count = 0;
-  return;
+  return !_request_media_type.empty();
+}
+
+//------------------------------------------------------------------------------
+std::string Request::bodyType() const
+{
+  return _request_media_type;
+}
+
+//------------------------------------------------------------------------------
+size_t Request::bodyLength() const
+{
+  return _request_data.length();
+}
+
+//------------------------------------------------------------------------------
+size_t Request::getBodyData(char* s, size_t offset, size_t max_count) const
+{
+  size_t bytes_available = _request_data.size() - offset;
+  size_t bytes_to_read = std::min(bytes_available, max_count);
+
+  memcpy(s, _request_data.data() + offset, bytes_to_read);
+
+  return bytes_to_read;
 }
 
 } // of namespace HTTP
-
 } // of namespace simgear

simgear/io/HTTPRequest.hxx

@@ -3,21 +3,85 @@
 
 #include <map>
 
+#include <simgear/structure/map.hxx>
 #include <simgear/structure/SGReferenced.hxx>
 #include <simgear/structure/SGSharedPtr.hxx>
 #include <simgear/math/sg_types.hxx>
 
+#include <boost/function.hpp>
+
+class SGPropertyNode;
+
 namespace simgear
 {
-
 namespace HTTP
 {
 
-class Request : public SGReferenced
+class Request:
+  public SGReferenced
 {
 public:
+    typedef boost::function<void(Request*)> Callback;
+
+    enum ReadyState
+    {
+      UNSENT = 0,
+      OPENED,
+      HEADERS_RECEIVED,
+      LOADING,
+      DONE,
+      FAILED
+    };
+
     virtual ~Request();
-    
+
+    /**
+     *
+     */
+    StringMap& requestHeaders()             { return _request_headers; }
+    const StringMap& requestHeaders() const { return _request_headers; }
+    std::string& requestHeader(const std::string& key)
+                                            { return _request_headers[key]; }
+    const std::string requestHeader(const std::string& key) const
+                                            { return _request_headers.get(key); }
+
+    /**
+     * Set the handler to be called when the request successfully completes.
+     *
+     * @note If the request is already complete, the handler is called
+     *       immediately.
+     */
+    Request* done(const Callback& cb);
+
+    /**
+     * Set the handler to be called when the request completes or aborts with an
+     * error.
+     *
+     * @note If the request has already failed, the handler is called
+     *       immediately.
+     */
+    Request* fail(const Callback& cb);
+
+    /**
+     * Set the handler to be called when the request either successfully
+     * completes or fails.
+     *
+     * @note If the request is already complete or has already failed, the
+     *       handler is called immediately.
+     */
+    Request* always(const Callback& cb);
+
+    /**
+     * Set the data for the body of the request. The request is automatically
+     * send using the POST method.
+     *
+     * @param data  Body data
+     * @param type  Media Type (aka MIME) of the body data
+     */
+    void setBodyData( const std::string& data,
+                      const std::string& type = "text/plain" );
+    void setBodyData( const SGPropertyNode* data );
+
     virtual void setUrl(const std::string& url);
     
     virtual std::string method() const
@@ -32,8 +96,8 @@ public:
     virtual unsigned short port() const;
     virtual std::string query() const;
     
-    virtual string_list requestHeaders() const;
-    virtual std::string header(const std::string& name) const;
+    StringMap const& responseHeaders() const
+        { return _responseHeaders; }
 
     virtual int responseCode() const
         { return _responseStatus; }
@@ -41,26 +105,30 @@ public:
     virtual std::string responseReason() const
         { return _responseReason; }
         
-    void setResponseLength(unsigned int l);    
+    void setResponseLength(unsigned int l);
     virtual unsigned int responseLength() const;
   
     /**
-     * Query the size of the request body. -1 (the default value) means no
-     * request body
+     * Check if request contains body data.
      */
-    virtual int requestBodyLength() const;
+    virtual bool hasBodyData() const;
+
+    /**
+     * Retrieve the request body content type.
+     */
+    virtual std::string bodyType() const;
+
+    /**
+     * Retrieve the size of the request body.
+     */
+    virtual size_t bodyLength() const;
     
     /**
      * Retrieve the body data bytes. Will be passed the maximum body bytes
-     * to return in the buffer, and should update count with the actual number
+     * to return in the buffer, and must return the actual number
      * of bytes written. 
      */
-    virtual void getBodyData(char* s, int& count) const;
-  
-    /**
-     * retrieve the request body content type. Default is text/plain
-     */
-    virtual std::string requestBodyType() const;
+    virtual size_t getBodyData(char* s, size_t offset, size_t max_count) const;
   
     /**
      * running total of body bytes received so far. Can be used
@@ -80,43 +148,72 @@ public:
     HTTPVersion responseVersion() const
         { return _responseVersion; }
     
-    static HTTPVersion decodeVersion(const std::string& v);
-    
+    ReadyState readyState() const { return _ready_state; }
+
+    /**
+     * Request aborting this request.
+     */
+    void abort();
+
+    /**
+     * Request aborting this request and specify the reported reaseon for it.
+     */
+    void abort(const std::string& reason);
+
     bool closeAfterComplete() const;
+    bool isComplete() const;
+
 protected:
     Request(const std::string& url, const std::string method = "GET");
 
+    virtual void requestStart();
     virtual void responseStart(const std::string& r);
     virtual void responseHeader(const std::string& key, const std::string& value);
     virtual void responseHeadersComplete();
     virtual void responseComplete();
-    virtual void failed();
     virtual void gotBodyData(const char* s, int n);
+
+    virtual void onDone();
+    virtual void onFail();
+    virtual void onAlways();
+
+    void setFailure(int code, const std::string& reason);
+
 private:
     friend class Client;
     friend class Connection;
+    friend class ContentDecoder;
     
-    void processBodyBytes(const char* s, int n);
-    void setFailure(int code, const std::string& reason);
+    Request(const Request&); // = delete;
+    Request& operator=(const Request&); // = delete;
 
-    std::string _method;
-    std::string _url;
-    HTTPVersion _responseVersion;
-    int _responseStatus;
-    std::string _responseReason;
-    unsigned int _responseLength;
-    unsigned int _receivedBodyBytes;
-    bool _willClose;
-    
-    typedef std::map<std::string, std::string> HeaderDict;
-    HeaderDict _responseHeaders; 
+    void processBodyBytes(const char* s, int n);
+    void setReadyState(ReadyState state);
+
+    std::string   _method;
+    std::string   _url;
+    StringMap     _request_headers;
+    std::string   _request_data;
+    std::string   _request_media_type;
+
+    HTTPVersion   _responseVersion;
+    int           _responseStatus;
+    std::string   _responseReason;
+    StringMap     _responseHeaders;
+    unsigned int  _responseLength;
+    unsigned int  _receivedBodyBytes;
+
+    Callback      _cb_done,
+                  _cb_fail,
+                  _cb_always;
+
+    ReadyState    _ready_state;
+    bool          _willClose;
 };
 
 typedef SGSharedPtr<Request> Request_ptr;
 
 } // of namespace HTTP
-
 } // of namespace simgear
 
 #endif // of SG_HTTP_REQUEST_HXX
-

simgear/io/SVNDirectory.cxx

@@ -0,0 +1,384 @@
+
+#include "SVNDirectory.hxx"
+
+#include <cassert>
+#include <fstream>
+#include <iostream>
+#include <boost/foreach.hpp>
+
+#include <simgear/debug/logstream.hxx>
+#include <simgear/misc/strutils.hxx>
+#include <simgear/misc/sg_dir.hxx>
+#include <simgear/io/HTTPClient.hxx>
+#include <simgear/io/DAVMultiStatus.hxx>
+#include <simgear/io/SVNRepository.hxx>
+#include <simgear/io/sg_file.hxx>
+#include <simgear/io/SVNReportParser.hxx>
+#include <simgear/package/md5.h>
+#include <simgear/structure/exception.hxx>
+
+using std::string;
+using std::cout;
+using std::endl;
+using namespace simgear;
+
+typedef std::vector<HTTP::Request_ptr> RequestVector;
+typedef std::map<std::string, DAVResource*> DAVResourceMap;
+
+
+const char* DAV_CACHE_NAME = ".terrasync_cache";
+const char* CACHE_VERSION_4_TOKEN = "terrasync-cache-4";
+
+// important: with the Google servers, setting this higher than '1' causes
+// server internal errors (500, the connection is closed). In other words we
+// can only specify update report items one level deep at most and no more.
+// (the root and its direct children, not NOT grand-children)
+const unsigned int MAX_UPDATE_REPORT_DEPTH = 1;
+
+enum LineState
+{
+  LINESTATE_HREF = 0,
+  LINESTATE_VERSIONNAME
+};
+
+SVNDirectory::SVNDirectory(SVNRepository *r, const SGPath& path) :
+  localPath(path),
+  dav(NULL),
+  repo(r),
+  _doingUpdateReport(false),
+  _parent(NULL)
+{
+  if (path.exists()) {
+    parseCache();
+  } 
+  
+  // don't create dir here, repo might not exist at all
+}
+  
+SVNDirectory::SVNDirectory(SVNDirectory* pr, DAVCollection* col) :
+  dav(col),
+  repo(pr->repository()),
+  _doingUpdateReport(false),
+  _parent(pr)
+{
+  assert(col->container());
+  assert(!col->url().empty());
+  assert(_parent);
+
+  localPath = pr->fsDir().file(col->name());
+  if (!localPath.exists()) {
+    Dir d(localPath);
+    d.create(0755);
+    writeCache();
+  } else {
+    parseCache();
+  }
+}
+
+SVNDirectory::~SVNDirectory()
+{
+    // recursive delete our child directories
+    BOOST_FOREACH(SVNDirectory* d, _children) {
+        delete d;
+    }
+}
+
+void SVNDirectory::parseCache()
+{
+  SGPath p(localPath);
+  p.append(DAV_CACHE_NAME);
+  if (!p.exists()) {
+    return;
+  }
+    
+  char href[1024];
+  char versionName[128];
+  LineState lineState = LINESTATE_HREF;
+  std::ifstream file(p.c_str());
+    if (!file.is_open()) {
+        SG_LOG(SG_IO, SG_WARN, "unable to open cache file for reading:" << p);
+        return;
+    }
+  bool doneSelf = false;
+    
+  file.getline(href, 1024);
+  if (strcmp(CACHE_VERSION_4_TOKEN, href)) {
+    SG_LOG(SG_IO, SG_WARN, "invalid cache file [missing header token]:" << p << " '" << href << "'");
+    return;
+  }
+    
+    std::string vccUrl;
+    file.getline(href, 1024);
+    vccUrl = href;
+    
+  while (!file.eof()) {
+    if (lineState == LINESTATE_HREF) {
+      file.getline(href, 1024);
+      lineState = LINESTATE_VERSIONNAME;
+    } else {
+      assert(lineState == LINESTATE_VERSIONNAME);
+      file.getline(versionName, 1024);
+      lineState = LINESTATE_HREF;
+      char* hrefPtr = href;
+    
+      if (!doneSelf) {
+        if (!dav) {
+          dav = new DAVCollection(hrefPtr);
+          dav->setVersionName(versionName);
+        } else {
+          assert(string(hrefPtr) == dav->url());
+        }
+        
+        if (!vccUrl.empty()) {
+            dav->setVersionControlledConfiguration(vccUrl);
+        }
+        
+        _cachedRevision = versionName;
+        doneSelf = true;
+      } else {
+        DAVResource* child = addChildDirectory(hrefPtr)->collection();
+          string s = strutils::strip(versionName);
+          if (!s.empty()) {
+              child->setVersionName(versionName);
+          }
+      } // of done self test
+    } // of line-state switching 
+  } // of file get-line loop
+}
+  
+void SVNDirectory::writeCache()
+{
+  SGPath p(localPath);
+  if (!p.exists()) {
+      Dir d(localPath);
+      d.create(0755);
+  }
+  
+  p.append(string(DAV_CACHE_NAME) + ".new");
+    
+  std::ofstream file(p.c_str(), std::ios::trunc);
+// first, cache file version header
+  file << CACHE_VERSION_4_TOKEN << '\n';
+ 
+// second, the repository VCC url
+  file << dav->versionControlledConfiguration() << '\n';
+      
+// third, our own URL, and version
+  file << dav->url() << '\n' << _cachedRevision << '\n';
+  
+  BOOST_FOREACH(DAVResource* child, dav->contents()) {
+    if (child->isCollection()) {
+        file << child->name() << '\n' << child->versionName() << "\n";
+    }
+  } // of child iteration
+    
+    file.close();
+    
+// approximately atomic delete + rename operation
+    SGPath cacheName(localPath);
+    cacheName.append(DAV_CACHE_NAME);
+    p.rename(cacheName);
+}
+
+void SVNDirectory::setBaseUrl(const string& url)
+{
+    if (_parent) {
+        SG_LOG(SG_IO, SG_ALERT, "setting base URL on non-root directory " << url);
+        return;
+    }
+    
+    if (dav && (url == dav->url())) {
+        return;
+    }
+    
+    dav = new DAVCollection(url);
+}
+
+std::string SVNDirectory::url() const
+{
+  if (!_parent) {
+    return repo->baseUrl();
+  }
+  
+  return _parent->url() + "/" + name();
+}
+
+std::string SVNDirectory::name() const
+{
+    return dav->name();
+} 
+
+DAVResource*
+SVNDirectory::addChildFile(const std::string& fileName)
+{
+    DAVResource* child = NULL;
+    child = new DAVResource(dav->urlForChildWithName(fileName));
+    dav->addChild(child);
+  
+    writeCache();
+    return child;
+}
+
+SVNDirectory*
+SVNDirectory::addChildDirectory(const std::string& dirName)
+{
+    if (dav->childWithName(dirName)) {
+        // existing child, let's remove it
+        deleteChildByName(dirName);
+    }
+    
+    DAVCollection* childCol = dav->createChildCollection(dirName);
+    SVNDirectory* child = new SVNDirectory(this, childCol);
+    childCol->setVersionName(child->cachedRevision());
+    _children.push_back(child);
+    writeCache();
+    return child;
+}
+
+void SVNDirectory::deleteChildByName(const std::string& nm)
+{
+    DAVResource* child = dav->childWithName(nm);
+    if (!child) {
+//        std::cerr << "ZZZ: deleteChildByName: unknown:" << nm << std::endl;
+        return;
+    }
+
+    SGPath path = fsDir().file(nm);
+    
+    if (child->isCollection()) {
+        Dir d(path);
+        d.remove(true);
+    
+        DirectoryList::iterator it = findChildDir(nm);
+        if (it != _children.end()) {
+            SVNDirectory* c = *it;
+    //        std::cout << "YYY: deleting SVNDirectory for:" << nm << std::endl;
+            delete c;
+            _children.erase(it);
+        }
+    } else {
+        path.remove();
+    }
+
+    dav->removeChild(child);
+    delete child;
+
+    writeCache();
+}
+  
+bool SVNDirectory::isDoingSync() const
+{
+  if (_doingUpdateReport) {
+      return true;
+  } 
+
+  BOOST_FOREACH(SVNDirectory* child, _children) {
+      if (child->isDoingSync()) {
+          return true;
+      } // of children
+  }
+    
+  return false;
+}
+
+void SVNDirectory::beginUpdateReport()
+{
+    _doingUpdateReport = true;
+    _cachedRevision.clear();
+    writeCache();
+}
+
+void SVNDirectory::updateReportComplete()
+{
+    _cachedRevision = dav->versionName();
+    _doingUpdateReport = false;
+    writeCache();
+    
+    SVNDirectory* pr = parent();
+    if (pr) {
+        pr->writeCache();
+    }    
+}
+
+SVNRepository* SVNDirectory::repository() const
+{
+    return repo;
+}
+
+void SVNDirectory::mergeUpdateReportDetails(unsigned int depth, 
+    string_list& items)
+{
+    // normal, easy case: we are fully in-sync at a revision
+    if (!_cachedRevision.empty()) {
+        std::ostringstream os;
+        os << "<S:entry rev=\"" << _cachedRevision << "\" depth=\"infinity\">"
+            << repoPath() << "</S:entry>";
+        items.push_back(os.str());
+        return;
+    }
+    
+    Dir d(localPath);
+    if (depth >= MAX_UPDATE_REPORT_DEPTH) {
+        SG_LOG(SG_IO, SG_INFO, localPath << "exceeded MAX_UPDATE_REPORT_DEPTH, cleaning");
+        d.removeChildren();
+        return;
+    }
+    
+    PathList cs = d.children(Dir::NO_DOT_OR_DOTDOT | Dir::INCLUDE_HIDDEN | Dir::TYPE_DIR);
+    BOOST_FOREACH(SGPath path, cs) {
+        SVNDirectory* c = child(path.file());
+        if (!c) {
+            // ignore this child, if it's an incomplete download,
+            // it will be over-written on the update anyway
+            //std::cerr << "unknown SVN child" << path << std::endl;
+        } else {
+            // recurse down into children
+            c->mergeUpdateReportDetails(depth+1, items);
+        }
+    } // of child dir iteration
+}
+
+std::string SVNDirectory::repoPath() const
+{
+    if (!_parent) {
+        return "/";
+    }
+    
+    // find the length of the repository base URL, then
+    // trim that off our repo URL - job done!
+    size_t baseUrlLen = repo->baseUrl().size();
+    return dav->url().substr(baseUrlLen + 1);
+}
+
+SVNDirectory* SVNDirectory::parent() const
+{
+    return _parent;
+}
+
+SVNDirectory* SVNDirectory::child(const std::string& dirName) const
+{
+    BOOST_FOREACH(SVNDirectory* d, _children) {
+        if (d->name() == dirName) {
+            return d;
+        }
+    }
+    
+    return NULL;
+}
+
+DirectoryList::iterator
+SVNDirectory::findChildDir(const std::string& dirName)
+{
+    DirectoryList::iterator it;
+    for (it=_children.begin(); it != _children.end(); ++it) {
+        if ((*it)->name() == dirName) {
+            return it;
+        }
+    }
+    return it;
+}
+
+simgear::Dir SVNDirectory::fsDir() const
+{
+    return Dir(localPath);
+}

simgear/io/SVNDirectory.hxx

@@ -0,0 +1,108 @@
+// DAVCollectionMirror.hxx - mirror a DAV collection to the local filesystem
+//
+// Copyright (C) 2013  James Turner <zakalawe@mac.com>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+
+#ifndef SG_IO_DAVCOLLECTIONMIRROR_HXX
+#define SG_IO_DAVCOLLECTIONMIRROR_HXX
+
+#include <string>
+#include <vector>
+#include <memory>
+
+#include <simgear/misc/sg_path.hxx>
+#include <simgear/misc/strutils.hxx>
+#include <simgear/io/DAVMultiStatus.hxx>
+
+namespace simgear  {
+
+class Dir;
+namespace HTTP { class Request; }
+
+// forward decls
+class DAVMirror;
+class SVNRepository;
+class SVNDirectory;
+
+typedef std::vector<SVNDirectory*> DirectoryList;
+
+class SVNDirectory
+{
+public:
+  // init from local
+  SVNDirectory(SVNRepository *repo, const SGPath& path);
+  ~SVNDirectory();
+  
+  void setBaseUrl(const std::string& url);
+  
+  // init from a collection
+  SVNDirectory(SVNDirectory* pr, DAVCollection* col);
+
+  void beginUpdateReport();
+  void updateReportComplete();
+  
+  bool isDoingSync() const;
+  
+  std::string url() const;
+  
+  std::string name() const;
+      
+  DAVResource* addChildFile(const std::string& fileName);
+  SVNDirectory* addChildDirectory(const std::string& dirName);
+      
+ // void updateChild(DAVResource* child);
+  void deleteChildByName(const std::string& name);
+  
+  SGPath fsPath() const
+    { return localPath; }
+  
+  simgear::Dir fsDir() const;
+  
+  std::string repoPath() const;
+    
+  SVNRepository* repository() const;
+  DAVCollection* collection() const
+    { return dav; }
+  
+  std::string cachedRevision() const
+      { return _cachedRevision; }
+  
+  void mergeUpdateReportDetails(unsigned int depth, string_list& items);
+  
+  SVNDirectory* parent() const;
+  SVNDirectory* child(const std::string& dirName) const;
+private:
+  
+  void parseCache();
+  void writeCache();
+  
+  DirectoryList::iterator findChildDir(const std::string& dirName);
+      
+  SGPath localPath;
+  DAVCollection* dav;
+  SVNRepository* repo;
+  
+  std::string _cachedRevision;
+  bool _doingUpdateReport;
+  
+  SVNDirectory* _parent;
+  DirectoryList _children;
+};
+
+} // of namespace simgear
+
+#endif // of SG_IO_DAVCOLLECTIONMIRROR_HXX

simgear/io/SVNReportParser.cxx

@@ -0,0 +1,604 @@
+// SVNReportParser -- parser for SVN report XML data
+//
+// Copyright (C) 2012  James Turner <zakalawe@mac.com>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#ifdef HAVE_CONFIG_H
+#  include <simgear_config.h>
+#endif
+     
+#include "SVNReportParser.hxx"
+
+#include <iostream>
+#include <cstring>
+#include <cassert>
+#include <algorithm>
+#include <sstream>
+#include <fstream>
+
+#include <boost/foreach.hpp>
+
+#include "simgear/misc/sg_path.hxx"
+#include "simgear/misc/sg_dir.hxx"
+#include "simgear/debug/logstream.hxx"
+#include "simgear/xml/easyxml.hxx"
+#include "simgear/misc/strutils.hxx"
+#include "simgear/package/md5.h"
+
+#ifdef SYSTEM_EXPAT
+#  include <expat.h>
+#else
+#  include "sg_expat.h"     
+#endif
+
+#include "SVNDirectory.hxx"
+#include "SVNRepository.hxx"
+#include "DAVMultiStatus.hxx"
+
+using std::cout;
+using std::cerr;
+using std::endl;
+using std::string;
+
+using namespace simgear;
+
+#define DAV_NS "DAV::"
+#define SVN_NS "svn::"
+#define SUBVERSION_DAV_NS "http://subversion.tigris.org/xmlns/dav/"
+
+namespace {
+    
+    #define MAX_ENCODED_INT_LEN 10
+    
+    static size_t
+    decode_size(unsigned char* &p,
+                const unsigned char *end)
+    {
+      if (p + MAX_ENCODED_INT_LEN < end)
+        end = p + MAX_ENCODED_INT_LEN;
+      /* Decode bytes until we're done.  */
+      size_t result = 0;
+      
+      while (p < end) {
+          result = (result << 7) | (*p & 0x7f);
+          if (((*p++ >> 7) & 0x1) == 0) {
+              break;
+          }
+      }
+      
+      return result;
+    }
+    
+    static bool
+    try_decode_size(unsigned char* &p,
+                const unsigned char *end)
+    {
+      if (p + MAX_ENCODED_INT_LEN < end)
+        end = p + MAX_ENCODED_INT_LEN;
+
+      while (p < end) {
+          if (((*p++ >> 7) & 0x1) == 0) {
+              return true;
+          }
+      }
+      
+      return false;
+    }
+    
+//  const char* SVN_UPDATE_REPORT_TAG = SVN_NS "update-report";
+ // const char* SVN_TARGET_REVISION_TAG = SVN_NS "target-revision";
+  const char* SVN_OPEN_DIRECTORY_TAG = SVN_NS "open-directory";
+  const char* SVN_OPEN_FILE_TAG = SVN_NS "open-file";
+  const char* SVN_ADD_DIRECTORY_TAG = SVN_NS "add-directory";
+  const char* SVN_ADD_FILE_TAG = SVN_NS "add-file";
+  const char* SVN_TXDELTA_TAG = SVN_NS "txdelta";
+  const char* SVN_SET_PROP_TAG = SVN_NS "set-prop";
+  const char* SVN_PROP_TAG = SVN_NS "prop";
+  const char* SVN_DELETE_ENTRY_TAG = SVN_NS "delete-entry";
+  
+  const char* SVN_DAV_MD5_CHECKSUM = SUBVERSION_DAV_NS ":md5-checksum";
+  
+  const char* DAV_HREF_TAG = DAV_NS "href";
+  const char* DAV_CHECKED_IN_TAG = DAV_NS "checked-in";
+  
+
+  const int svn_txdelta_source = 0;
+  const int svn_txdelta_target = 1;
+  const int svn_txdelta_new = 2;
+
+  const size_t DELTA_HEADER_SIZE = 4;
+    
+  /**
+   * helper struct to decode and store the SVN delta header
+   * values
+   */
+  struct SVNDeltaWindow
+  {
+  public:
+
+      static bool isWindowComplete(unsigned char* buffer, size_t bytes)
+      {
+          unsigned char* p = buffer;
+          unsigned char* pEnd = p + bytes;
+          // if we can't decode five sizes, certainly incomplete
+          for (int i=0; i<5; i++) {
+              if (!try_decode_size(p, pEnd)) {
+                  return false;
+              }
+          }
+          
+          p = buffer;
+        // ignore these three
+          decode_size(p, pEnd);
+          decode_size(p, pEnd);
+          decode_size(p, pEnd);
+          size_t instructionLen = decode_size(p, pEnd);
+          size_t newLength = decode_size(p, pEnd);
+          size_t headerLength = p - buffer;
+          
+          return (bytes >= (instructionLen + newLength + headerLength));
+      }
+      
+     SVNDeltaWindow(unsigned char* p) :
+         headerLength(0),
+         _ptr(p)
+     {
+         sourceViewOffset = decode_size(p, p+20);
+         sourceViewLength = decode_size(p, p+20);
+         targetViewLength = decode_size(p, p+20);
+         instructionLength = decode_size(p, p+20);
+         newLength = decode_size(p, p+20);
+         
+         headerLength = p - _ptr;
+         _ptr = p;
+     }
+  
+    bool apply(std::vector<unsigned char>& output, std::istream& source)
+    {
+        unsigned char* pEnd = _ptr + instructionLength;
+        unsigned char* newData = pEnd;
+        
+        while (_ptr < pEnd) {
+          int op = ((*_ptr >> 6) & 0x3);  
+          if (op >= 3) {
+              SG_LOG(SG_IO, SG_INFO, "SVNDeltaWindow: bad opcode:" << op);
+              return false;
+          }
+      
+          int length = *_ptr++ & 0x3f;
+          int offset = 0;
+        
+          if (length == 0) {
+            length = decode_size(_ptr, pEnd);
+          }
+        
+          if (length == 0) {
+			SG_LOG(SG_IO, SG_INFO, "SVNDeltaWindow: malformed stream, 0 length" << op);
+            return false;
+          }
+      
+          // if op != new, decode another size value
+          if (op != svn_txdelta_new) {
+            offset = decode_size(_ptr, pEnd);
+          }
+
+          if (op == svn_txdelta_target) {
+              // this is inefficent, but ranges can overlap.
+              while (length > 0) {
+                  output.push_back(output[offset++]);
+                  --length;
+              }
+          } else if (op == svn_txdelta_new) {
+              output.insert(output.end(), newData, newData + length);
+              newData += length;
+          } else if (op == svn_txdelta_source) {
+            source.seekg(offset);
+            char* sourceBuf = (char*) malloc(length);
+            assert(sourceBuf);
+            source.read(sourceBuf, length);
+            output.insert(output.end(), sourceBuf, sourceBuf + length);
+            free(sourceBuf);
+          } else {
+              SG_LOG(SG_IO, SG_WARN, "bad opcode logic");
+              return false;
+          }
+        } // of instruction loop
+        
+        return true;
+    }  
+  
+    size_t size() const
+    {
+        return headerLength + instructionLength + newLength;
+    }
+  
+    unsigned int sourceViewOffset;
+    size_t sourceViewLength,
+      targetViewLength;
+    size_t headerLength,
+        instructionLength,
+        newLength;
+    
+private:  
+    unsigned char* _ptr;
+  };
+  
+  
+} // of anonymous namespace
+
+class SVNReportParser::SVNReportParserPrivate
+{
+public:
+  SVNReportParserPrivate(SVNRepository* repo) :
+    tree(repo),
+    status(SVNRepository::SVN_NO_ERROR),
+    parserInited(false),
+    currentPath(repo->fsBase())
+  {
+    inFile = false;
+    currentDir = repo->rootDir();
+  }
+
+  ~SVNReportParserPrivate()
+  {
+  }
+  
+  void startElement (const char * name, const char** attributes)
+  {    
+      if (status != SVNRepository::SVN_NO_ERROR) {
+          return;
+      }
+      
+    ExpatAtts attrs(attributes);
+    tagStack.push_back(name);
+    if (!strcmp(name, SVN_TXDELTA_TAG)) {
+        txDeltaData.clear();
+    } else if (!strcmp(name, SVN_ADD_FILE_TAG)) {
+      string fileName(attrs.getValue("name"));
+      SGPath filePath(currentDir->fsDir().file(fileName));
+      currentPath = filePath;
+      inFile = true;
+    } else if (!strcmp(name, SVN_OPEN_FILE_TAG)) {
+      string fileName(attrs.getValue("name"));
+      SGPath filePath(Dir(currentPath).file(fileName));
+      currentPath = filePath;
+       
+      if (!filePath.exists()) {
+          fail(SVNRepository::SVN_ERROR_FILE_NOT_FOUND);
+          return;
+      }
+
+      inFile = true;
+    } else if (!strcmp(name, SVN_ADD_DIRECTORY_TAG)) {
+      string dirName(attrs.getValue("name"));
+      Dir d(currentDir->fsDir().file(dirName));
+      if (d.exists()) {
+          // policy decision : if we're doing an add, wipe the existing
+          d.remove(true);
+      }
+    
+      currentDir = currentDir->addChildDirectory(dirName);
+      currentPath = currentDir->fsPath();
+      currentDir->beginUpdateReport();
+      //cout << "addDir:" << currentPath << endl;
+    } else if (!strcmp(name, SVN_SET_PROP_TAG)) {
+      setPropName = attrs.getValue("name");
+      setPropValue.clear();
+    } else if (!strcmp(name, SVN_DAV_MD5_CHECKSUM)) {
+      md5Sum.clear();
+    } else if (!strcmp(name, SVN_OPEN_DIRECTORY_TAG)) {
+        string dirName;
+        if (attrs.getValue("name")) {
+            dirName = string(attrs.getValue("name"));
+        }
+        openDirectory(dirName);
+    } else if (!strcmp(name, SVN_DELETE_ENTRY_TAG)) {
+        string entryName(attrs.getValue("name"));
+        deleteEntry(entryName);
+    } else if (!strcmp(name, DAV_CHECKED_IN_TAG) ||
+               !strcmp(name, DAV_HREF_TAG) ||
+               !strcmp(name, SVN_PROP_TAG)) {
+        // don't warn on these ones
+    } else {
+        //SG_LOG(SG_IO, SG_WARN, "SVNReportParser: unhandled tag:" << name);
+    }
+  } // of startElement
+  
+  void openDirectory(const std::string& dirName)
+  {
+      if (dirName.empty()) {
+          // root directory, we shall assume
+          currentDir = tree->rootDir();
+      } else {
+          assert(currentDir);
+          currentDir = currentDir->child(dirName);
+      }
+      
+      assert(currentDir);
+      currentPath = currentDir->fsPath();
+      currentDir->beginUpdateReport();
+  }
+  
+  void deleteEntry(const std::string& entryName)
+  {
+      currentDir->deleteChildByName(entryName);
+  }
+  
+  bool decodeTextDelta(const SGPath& outputPath)
+  {
+      std::vector<unsigned char> output, decoded;
+    strutils::decodeBase64(txDeltaData, decoded);
+    size_t bytesToDecode = decoded.size();
+         
+    unsigned char* p = decoded.data();
+    if (memcmp(p, "SVN\0", DELTA_HEADER_SIZE) != 0) {
+        return false; // bad header
+    }
+    
+    bytesToDecode -= DELTA_HEADER_SIZE;
+    p += DELTA_HEADER_SIZE;
+    std::ifstream source;
+    source.open(outputPath.c_str(), std::ios::in | std::ios::binary);
+    
+    while (bytesToDecode > 0) {  
+        if (!SVNDeltaWindow::isWindowComplete(p, bytesToDecode)) {
+            SG_LOG(SG_IO, SG_WARN, "SVN txdelta broken window");
+            return false;
+        }
+	
+        SVNDeltaWindow window(p);      
+        assert(bytesToDecode >= window.size());
+        window.apply(output, source);
+        bytesToDecode -= window.size();
+        p += window.size();
+    }
+
+    source.close();
+
+    std::ofstream f;
+    f.open(outputPath.c_str(), 
+      std::ios::out | std::ios::trunc | std::ios::binary);
+    f.write((char*) output.data(), output.size());
+
+    // compute MD5 while we have the file in memory
+    memset(&md5Context, 0, sizeof(SG_MD5_CTX));
+    SG_MD5Init(&md5Context);
+    SG_MD5Update(&md5Context, (unsigned char*) output.data(), output.size());
+    SG_MD5Final(&md5Context);
+    decodedFileMd5 = strutils::encodeHex(md5Context.digest, 16);
+
+    return true;
+  }
+  
+  void endElement (const char * name)
+  {
+      if (status != SVNRepository::SVN_NO_ERROR) {
+          return;
+      }
+      
+    assert(tagStack.back() == name);
+    tagStack.pop_back();
+        
+    if (!strcmp(name, SVN_TXDELTA_TAG)) {
+      if (!decodeTextDelta(currentPath)) {
+        fail(SVNRepository::SVN_ERROR_TXDELTA);
+      }
+    } else if (!strcmp(name, SVN_ADD_FILE_TAG)) {
+      finishFile(currentPath);
+    } else if (!strcmp(name, SVN_OPEN_FILE_TAG)) {
+      finishFile(currentPath);
+    } else if (!strcmp(name, SVN_ADD_DIRECTORY_TAG)) {
+      // pop directory
+      currentPath = currentPath.dir();
+      currentDir->updateReportComplete();
+      currentDir = currentDir->parent();
+    } else if (!strcmp(name, SVN_SET_PROP_TAG)) {
+      if (setPropName == "svn:entry:committed-rev") {
+        revision = strutils::to_int(setPropValue);
+        currentVersionName = setPropValue;
+        if (!inFile) {
+          // for directories we have the resource already
+          // for adding files, we might not; we set the version name
+          // above when ending the add/open-file element
+          currentDir->collection()->setVersionName(currentVersionName);
+        } 
+      }
+    } else if (!strcmp(name, SVN_DAV_MD5_CHECKSUM)) {
+      // validate against (presumably) just written file
+      if (decodedFileMd5 != md5Sum) {
+        fail(SVNRepository::SVN_ERROR_CHECKSUM);
+      }
+    } else if (!strcmp(name, SVN_OPEN_DIRECTORY_TAG)) {
+        currentDir->updateReportComplete();
+        if (currentDir->parent()) {   
+          // pop the collection stack
+          currentDir = currentDir->parent();
+        }
+        
+        currentPath = currentDir->fsPath();
+    } else {
+    //  std::cout << "element:" << name;
+    }
+  }
+  
+  void finishFile(const SGPath& path)
+  {
+      currentPath = path.dir();
+      inFile = false;
+  }
+  
+  void data (const char * s, int length)
+  {
+      if (status != SVNRepository::SVN_NO_ERROR) {
+          return;
+      }
+      
+    if (tagStack.back() == SVN_SET_PROP_TAG) {
+      setPropValue.append(s, length);
+    } else if (tagStack.back() == SVN_TXDELTA_TAG) {
+      txDeltaData.append(s, length);
+    } else if (tagStack.back() == SVN_DAV_MD5_CHECKSUM) {
+      md5Sum.append(s, length);
+    }
+  }
+  
+  void pi (const char * target, const char * data) {}
+  
+  string tagN(const unsigned int n) const
+  {
+    size_t sz = tagStack.size();
+    if (n >= sz) {
+      return string();
+    }
+    
+    return tagStack[sz - (1 + n)];
+  }
+  
+  void fail(SVNRepository::ResultCode err)
+  {
+      status = err;
+  }
+  
+  SVNRepository* tree;
+  DAVCollection* rootCollection;
+  SVNDirectory* currentDir;
+  SVNRepository::ResultCode status;
+  
+  bool parserInited;
+  XML_Parser xmlParser;
+  
+// in-flight data
+  string_list tagStack;
+  string currentVersionName;
+  string txDeltaData;
+  SGPath currentPath;
+  bool inFile;
+    
+  unsigned int revision;
+  SG_MD5_CTX md5Context;
+  string md5Sum, decodedFileMd5;
+  std::string setPropName, setPropValue;
+};
+
+
+////////////////////////////////////////////////////////////////////////
+// Static callback functions for Expat.
+////////////////////////////////////////////////////////////////////////
+
+#define VISITOR static_cast<SVNReportParser::SVNReportParserPrivate *>(userData)
+
+static void
+start_element (void * userData, const char * name, const char ** atts)
+{
+  VISITOR->startElement(name, atts);
+}
+
+static void
+end_element (void * userData, const char * name)
+{
+  VISITOR->endElement(name);
+}
+
+static void
+character_data (void * userData, const char * s, int len)
+{
+  VISITOR->data(s, len);
+}
+
+static void
+processing_instruction (void * userData,
+                        const char * target,
+                        const char * data)
+{
+  VISITOR->pi(target, data);
+}
+
+#undef VISITOR
+
+///////////////////////////////////////////////////////////////////////////////
+
+SVNReportParser::SVNReportParser(SVNRepository* repo) :
+  _d(new SVNReportParserPrivate(repo))
+{
+  
+}
+
+SVNReportParser::~SVNReportParser()
+{
+}
+
+SVNRepository::ResultCode
+SVNReportParser::innerParseXML(const char* data, int size)
+{
+    if (_d->status != SVNRepository::SVN_NO_ERROR) {
+        return _d->status;
+    }
+    
+    bool isEnd = (data == NULL);
+    if (!XML_Parse(_d->xmlParser, data, size, isEnd)) {
+      SG_LOG(SG_IO, SG_INFO, "SVN parse error:" << XML_ErrorString(XML_GetErrorCode(_d->xmlParser))
+             << " at line:" << XML_GetCurrentLineNumber(_d->xmlParser)
+             << " column " << XML_GetCurrentColumnNumber(_d->xmlParser));
+    
+      XML_ParserFree(_d->xmlParser);
+      _d->parserInited = false;
+      return SVNRepository::SVN_ERROR_XML;
+    } else if (isEnd) {
+        XML_ParserFree(_d->xmlParser);
+        _d->parserInited = false;
+    }
+
+    return _d->status;
+}
+
+SVNRepository::ResultCode
+SVNReportParser::parseXML(const char* data, int size)
+{
+    if (_d->status != SVNRepository::SVN_NO_ERROR) {
+        return _d->status;
+    }
+    
+  if (!_d->parserInited) {
+    _d->xmlParser = XML_ParserCreateNS(0, ':');
+    XML_SetUserData(_d->xmlParser, _d.get());
+    XML_SetElementHandler(_d->xmlParser, start_element, end_element);
+    XML_SetCharacterDataHandler(_d->xmlParser, character_data);
+    XML_SetProcessingInstructionHandler(_d->xmlParser, processing_instruction);
+    _d->parserInited = true;
+  }
+  
+  return innerParseXML(data, size);
+}
+
+SVNRepository::ResultCode SVNReportParser::finishParse()
+{
+    if (_d->status != SVNRepository::SVN_NO_ERROR) {
+        return _d->status;
+    }
+    
+    return innerParseXML(NULL, 0);
+}
+
+std::string SVNReportParser::etagFromRevision(unsigned int revision)
+{
+  // etags look like W/"7//", hopefully this is stable
+  // across different servers and similar
+  std::ostringstream os;
+  os << "W/\"" << revision << "//";
+  return os.str();
+}
+
+

simgear/io/SVNReportParser.hxx

@@ -0,0 +1,57 @@
+// SVNReportParser -- parser for SVN report XML data
+//
+// Copyright (C) 2012  James Turner <zakalawe@mac.com>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+
+#ifndef SG_IO_SVNREPORTPARSER_HXX
+#define SG_IO_SVNREPORTPARSER_HXX
+
+#include <string>
+#include <memory> // for auto_ptr
+
+#include "SVNRepository.hxx"
+
+class SGPath;
+
+namespace simgear
+{
+  
+class SVNRepository;
+
+class SVNReportParser
+{
+public:
+  SVNReportParser(SVNRepository* repo);
+  ~SVNReportParser();
+  
+  // incremental XML parsing
+  SVNRepository::ResultCode parseXML(const char* data, int size);
+  
+  SVNRepository::ResultCode finishParse();
+        
+  static std::string etagFromRevision(unsigned int revision);
+          
+  class SVNReportParserPrivate;
+private:
+    SVNRepository::ResultCode innerParseXML(const char* data, int size);
+        
+  std::auto_ptr<SVNReportParserPrivate> _d;
+};
+
+} // of namespace simgear
+
+#endif // of SG_IO_SVNREPORTPARSER_HXX

simgear/io/SVNRepository.cxx

@@ -0,0 +1,382 @@
+// DAVMirrorTree -- mirror a DAV tree to the local file-system
+//
+// Copyright (C) 2012  James Turner <zakalawe@mac.com>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#include "SVNRepository.hxx"
+
+#include <iostream>
+#include <cstring>
+#include <cassert>
+#include <algorithm>
+#include <sstream>
+#include <map>
+#include <set>
+#include <fstream>
+
+#include <boost/foreach.hpp>
+
+#include "simgear/debug/logstream.hxx"
+#include "simgear/misc/strutils.hxx"
+#include <simgear/misc/sg_dir.hxx>
+#include <simgear/io/HTTPClient.hxx>
+#include <simgear/io/DAVMultiStatus.hxx>
+#include <simgear/io/SVNDirectory.hxx>
+#include <simgear/io/sg_file.hxx>
+#include <simgear/io/SVNReportParser.hxx>
+
+using std::cout;
+using std::cerr;
+using std::endl;
+using std::string;
+
+namespace simgear
+{
+
+typedef std::vector<HTTP::Request_ptr> RequestVector;
+
+class SVNRepoPrivate
+{
+public:
+    SVNRepoPrivate(SVNRepository* parent) : 
+        p(parent), 
+        isUpdating(false),
+        status(SVNRepository::SVN_NO_ERROR)
+    { ; }
+    
+    SVNRepository* p; // link back to outer
+    SVNDirectory* rootCollection;
+    HTTP::Client* http;
+    std::string baseUrl;
+    std::string vccUrl;
+    std::string targetRevision;
+    bool isUpdating;
+    SVNRepository::ResultCode status;
+    
+    void svnUpdateDone()
+    {
+        isUpdating = false;
+    }
+    
+    void updateFailed(HTTP::Request* req, SVNRepository::ResultCode err)
+    {
+        SG_LOG(SG_IO, SG_WARN, "SVN: failed to update from:" << req->url()
+            << "\n(repository:" << p->baseUrl() << ")");
+        isUpdating = false;
+        status = err;
+    }
+      
+    void propFindComplete(HTTP::Request* req, DAVCollection* col);
+    void propFindFailed(HTTP::Request* req, SVNRepository::ResultCode err);
+};
+
+
+namespace { // anonmouse
+    
+    string makeAbsoluteUrl(const string& url, const string& base)
+    {
+      if (strutils::starts_with(url, "http://"))
+        return url; // already absolute
+  
+      assert(strutils::starts_with(base, "http://"));
+      int schemeEnd = base.find("://");
+      int hostEnd = base.find('/', schemeEnd + 3);
+      if (hostEnd < 0) {
+        return url;
+      }
+  
+      return base.substr(0, hostEnd) + url;
+    }
+    
+    // keep the responses small by only requesting the properties we actually
+    // care about; the ETag, length and MD5-sum
+    const char* PROPFIND_REQUEST_BODY =
+      "<?xml version=\"1.0\" encoding=\"utf-8\" ?>"
+      "<D:propfind xmlns:D=\"DAV:\">"
+      "<D:prop xmlns:R=\"http://subversion.tigris.org/xmlns/dav/\">"
+      "<D:resourcetype/>"
+      "<D:version-name/>"
+      "<D:version-controlled-configuration/>"
+      "</D:prop>"
+      "</D:propfind>";
+
+    class PropFindRequest : public HTTP::Request
+    {
+    public:
+      PropFindRequest(SVNRepoPrivate* repo) :
+        Request(repo->baseUrl, "PROPFIND"),
+        _repo(repo)
+      {
+        requestHeader("Depth") = "0";
+        setBodyData( PROPFIND_REQUEST_BODY,
+                     "application/xml; charset=\"utf-8\"" );
+      }
+
+    protected:
+      virtual void responseHeadersComplete()
+      {
+        if (responseCode() == 207) {
+            // fine
+        } else if (responseCode() == 404) {
+            _repo->propFindFailed(this, SVNRepository::SVN_ERROR_NOT_FOUND);
+        } else {
+            SG_LOG(SG_IO, SG_WARN, "request for:" << url() << 
+                " return code " << responseCode());
+            _repo->propFindFailed(this, SVNRepository::SVN_ERROR_SOCKET);
+            _repo = NULL;
+        }
+      }
+  
+      virtual void onDone()
+      {
+        if (responseCode() == 207) {
+          _davStatus.finishParse();
+          if (_davStatus.isValid()) {
+              _repo->propFindComplete(this, (DAVCollection*) _davStatus.resource());
+          } else {
+              _repo->propFindFailed(this, SVNRepository::SVN_ERROR_SOCKET);
+          }
+        }
+      }
+  
+      virtual void gotBodyData(const char* s, int n)
+      {
+        if (responseCode() != 207) {
+          return;
+        }
+        _davStatus.parseXML(s, n);
+      }
+        
+        virtual void onFail()
+        {
+            HTTP::Request::onFail();
+			if (_repo) {
+				_repo->propFindFailed(this, SVNRepository::SVN_ERROR_SOCKET);
+				_repo = NULL;
+			}
+        }
+        
+    private:
+      SVNRepoPrivate* _repo;
+      DAVMultiStatus _davStatus;
+    };
+
+class UpdateReportRequest:
+  public HTTP::Request
+{
+public:
+  UpdateReportRequest(SVNRepoPrivate* repo, 
+      const std::string& aVersionName,
+      bool startEmpty) :
+    HTTP::Request("", "REPORT"),
+    _parser(repo->p),
+    _repo(repo),
+    _failed(false)
+  {       
+    setUrl(repo->vccUrl);
+    std::string request =
+    "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n"
+    "<S:update-report send-all=\"true\" xmlns:S=\"svn:\">\n"
+    "<S:src-path>" + repo->baseUrl + "</S:src-path>\n"
+    "<S:depth>unknown</S:depth>\n"
+    "<S:entry rev=\"" + aVersionName + "\" depth=\"infinity\" start-empty=\"true\"/>\n";
+
+    if( !startEmpty )
+    {
+      string_list entries;
+      _repo->rootCollection->mergeUpdateReportDetails(0, entries);
+      BOOST_FOREACH(string e, entries)
+      {
+        request += e + "\n";
+      }
+    }
+
+    request += "</S:update-report>";
+
+    setBodyData(request, "application/xml; charset=\"utf-8\"");
+  }
+
+protected:
+  virtual void onDone()
+  {
+      if (_failed) {
+          return;
+      }
+      
+    if (responseCode() == 200) {
+          SVNRepository::ResultCode err = _parser.finishParse();
+          if (err) {
+              _repo->updateFailed(this, err);
+              _failed = true;
+          } else {
+              _repo->svnUpdateDone();
+          }
+    } else if (responseCode() == 404) {
+        _repo->updateFailed(this, SVNRepository::SVN_ERROR_NOT_FOUND);
+        _failed = true;
+    } else {
+        SG_LOG(SG_IO, SG_WARN, "SVN: request for:" << url() <<
+        " got HTTP status " << responseCode());
+        _repo->updateFailed(this, SVNRepository::SVN_ERROR_HTTP);
+        _failed = true;
+    }
+  }
+
+  virtual void gotBodyData(const char* s, int n)
+  {    
+      if (_failed) {
+          return;
+      }
+      
+    if (responseCode() != 200) {
+        return;
+    }
+    
+    SVNRepository::ResultCode err = _parser.parseXML(s, n);
+    if (err) {
+        _failed = true;
+        SG_LOG(SG_IO, SG_WARN, this << ": SVN: request for:" << url() << " failed:" << err);
+        _repo->updateFailed(this, err);
+        _repo = NULL;
+    }
+  }
+
+    virtual void onFail()
+    {
+        HTTP::Request::onFail();
+        if (_repo) {
+            _repo->updateFailed(this, SVNRepository::SVN_ERROR_SOCKET);
+            _repo = NULL;
+        }
+    }
+private:
+  SVNReportParser _parser;
+  SVNRepoPrivate* _repo;
+  bool _failed;
+};
+        
+} // anonymous 
+
+SVNRepository::SVNRepository(const SGPath& base, HTTP::Client *cl) :
+  _d(new SVNRepoPrivate(this))
+{
+  _d->http = cl;
+  _d->rootCollection = new SVNDirectory(this, base);
+  _d->baseUrl = _d->rootCollection->url();  
+}
+
+SVNRepository::~SVNRepository()
+{
+    delete _d->rootCollection;
+}
+
+void SVNRepository::setBaseUrl(const std::string &url)
+{
+  _d->baseUrl = url;
+  _d->rootCollection->setBaseUrl(url);
+}
+
+std::string SVNRepository::baseUrl() const
+{
+  return _d->baseUrl;
+}
+
+HTTP::Client* SVNRepository::http() const
+{
+  return _d->http;
+}
+
+SGPath SVNRepository::fsBase() const
+{
+  return _d->rootCollection->fsPath();
+}
+
+bool SVNRepository::isBare() const
+{
+    if (!fsBase().exists() || Dir(fsBase()).isEmpty()) {
+        return true;
+    }
+    
+    if (_d->vccUrl.empty()) {
+        return true;
+    }
+    
+    return false;
+}
+
+void SVNRepository::update()
+{  
+    _d->status = SVN_NO_ERROR;
+    if (_d->targetRevision.empty() || _d->vccUrl.empty()) {        
+        _d->isUpdating = true;        
+        PropFindRequest* pfr = new PropFindRequest(_d.get());
+        http()->makeRequest(pfr);
+        return;
+    }
+        
+    if (_d->targetRevision == rootDir()->cachedRevision()) {
+        SG_LOG(SG_IO, SG_DEBUG, baseUrl() << " in sync at version " << _d->targetRevision);
+        _d->isUpdating = false;
+        return;
+    }
+    
+    _d->isUpdating = true;
+    UpdateReportRequest* urr = new UpdateReportRequest(_d.get(), 
+        _d->targetRevision, isBare());
+    http()->makeRequest(urr);
+}
+  
+bool SVNRepository::isDoingSync() const
+{
+    if (_d->status != SVN_NO_ERROR) {
+        return false;
+    }
+    
+    return _d->isUpdating || _d->rootCollection->isDoingSync();
+}
+
+SVNDirectory* SVNRepository::rootDir() const
+{
+    return _d->rootCollection;
+}
+
+SVNRepository::ResultCode
+SVNRepository::failure() const
+{
+    return _d->status;
+}
+
+///////////////////////////////////////////////////////////////////////////
+
+void SVNRepoPrivate::propFindComplete(HTTP::Request* req, DAVCollection* c)
+{
+    targetRevision = c->versionName();
+    vccUrl = makeAbsoluteUrl(c->versionControlledConfiguration(), baseUrl);
+    rootCollection->collection()->setVersionControlledConfiguration(vccUrl);    
+    p->update();
+}
+  
+void SVNRepoPrivate::propFindFailed(HTTP::Request *req, SVNRepository::ResultCode err)
+{
+    if (err != SVNRepository::SVN_ERROR_NOT_FOUND) {
+        SG_LOG(SG_IO, SG_WARN, "PropFind failed for:" << req->url());
+    }
+    
+    isUpdating = false;
+    status = err;
+}
+
+} // of namespace simgear

simgear/io/SVNRepository.hxx

@@ -0,0 +1,78 @@
+// DAVMirrorTree.hxx - mirror a DAV tree to the local file system
+//
+// Copyright (C) 2012  James Turner <zakalawe@mac.com>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+
+#ifndef SG_IO_DAVMIRRORTREE_HXX
+#define SG_IO_DAVMIRRORTREE_HXX
+
+#include <string>
+#include <vector>
+#include <memory>
+
+#include <simgear/misc/sg_path.hxx>
+
+namespace simgear  {
+  
+  namespace HTTP {
+    class Client;
+  }
+  
+class SVNDirectory;  
+class SVNRepoPrivate;
+
+class SVNRepository
+{
+public:
+  
+    SVNRepository(const SGPath& root, HTTP::Client* cl);
+    ~SVNRepository();
+
+    SVNDirectory* rootDir() const;
+    SGPath fsBase() const;
+
+    void setBaseUrl(const std::string& url);
+    std::string baseUrl() const;
+
+    HTTP::Client* http() const;
+
+    void update();
+
+    bool isDoingSync() const;
+    
+    enum ResultCode {
+        SVN_NO_ERROR = 0,
+        SVN_ERROR_NOT_FOUND,
+        SVN_ERROR_SOCKET,
+        SVN_ERROR_XML,
+        SVN_ERROR_TXDELTA,
+        SVN_ERROR_IO,
+        SVN_ERROR_CHECKSUM,
+        SVN_ERROR_FILE_NOT_FOUND,
+        SVN_ERROR_HTTP
+    };
+    
+    ResultCode failure() const;
+private:
+    bool isBare() const;
+    
+    std::auto_ptr<SVNRepoPrivate> _d;
+};
+
+} // of namespace simgear
+
+#endif // of SG_IO_DAVMIRRORTREE_HXX

simgear/io/http_svn.cxx

@@ -0,0 +1,51 @@
+#include <cstdio>
+#include <cstring>
+#include <signal.h>
+
+#include <iostream>
+#include <boost/foreach.hpp>
+
+
+#include <simgear/io/sg_file.hxx>
+#include <simgear/io/HTTPClient.hxx>
+#include <simgear/io/HTTPRequest.hxx>
+#include <simgear/io/sg_netChannel.hxx>
+#include <simgear/io/DAVMultiStatus.hxx>
+#include <simgear/io/SVNRepository.hxx>
+#include <simgear/debug/logstream.hxx>
+
+#include <simgear/misc/strutils.hxx>
+#include <simgear/timing/timestamp.hxx>
+
+using namespace simgear;
+using std::cout;
+using std::endl;
+using std::cerr;
+using std::string;
+
+HTTP::Client* httpClient;
+
+int main(int argc, char* argv[])
+{
+  sglog().setLogLevels( SG_ALL, SG_INFO );
+  HTTP::Client cl;
+  httpClient = &cl;
+
+  
+  SGPath p("/Users/jmt/Desktop/traffic");
+  SVNRepository airports(p, &cl);
+ //  airports.setBaseUrl("http://svn.goneabitbursar.com/testproject1");
+//  airports.setBaseUrl("http://terrascenery.googlecode.com/svn/trunk/data/Scenery/Models");
+  
+  airports.setBaseUrl("http://fgfs.goneabitbursar.com/fgfsai/trunk/AI/Traffic");
+  
+//  airports.setBaseUrl("http://terrascenery.googlecode.com/svn/trunk/data/Scenery/Airports");
+  airports.update();
+  
+  while (airports.isDoingSync()) {
+    cl.update(100);
+  }
+  
+  cout << "all done!" << endl;
+  return EXIT_SUCCESS;
+}

simgear/io/httpget.cxx

@@ -48,35 +48,11 @@ public:
         }
         
         string key = h.substr(0, colonPos);
-        _headers[key] = h.substr(colonPos + 1);
+        requestHeader(key) = h.substr(colonPos + 1);
     }
     
-    virtual string_list requestHeaders() const
-    {
-        string_list r;
-        std::map<string, string>::const_iterator it;
-        for (it = _headers.begin(); it != _headers.end(); ++it) {
-            r.push_back(it->first);
-        }
-        
-        return r;
-    }
-    
-    virtual string header(const string& name) const
-    {
-        std::map<string, string>::const_iterator it = _headers.find(name);
-        if (it == _headers.end()) {
-            return string();
-        }
-        
-        return it->second;
-    }
 protected:
-    virtual void responseHeadersComplete()
-    {
-    }
-
-    virtual void responseComplete()
+    virtual void onDone()
     {
         _complete = true;
     }  
@@ -88,7 +64,6 @@ protected:
 private:    
     bool _complete;
     SGFile* _file;
-    std::map<string, string> _headers;
 };
 
 int main(int argc, char* argv[])

simgear/io/raw_socket.cxx

@@ -454,6 +454,23 @@ bool Socket::open ( bool stream )
 #endif
   }
 
+#ifdef SO_NOSIGPIPE
+  // Do not generate SIGPIPE signal (which immediately terminates the program),
+  // instead ::send() will return -1 and errno will be set to EPIPE.
+  // SO_NOSIGPIPE should be available on Mac/BSD systems, but is not available
+  // within Posix/Linux.
+  // This only works for calls to ::send() but not for ::write():
+  // http://freebsd.1045724.n5.nabble.com/is-setsockopt-SO-NOSIGPIPE-work-tp4011054p4011055.html
+  int set = 1;
+  setsockopt(handle, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(set));
+#endif
+
+#ifndef MSG_NOSIGNAL
+# define MSG_NOSIGNAL 0
+#endif
+  // TODO supress SIGPIPE if neither SO_NOSIGPIPE nor MSG_NOSIGNAL is available
+  // http://krokisplace.blogspot.co.at/2010/02/suppressing-sigpipe-in-library.html
+
   return (handle != -1);
 }
 
@@ -592,7 +609,7 @@ int Socket::connect ( IPAddress* addr )
 int Socket::send (const void * buffer, int size, int flags)
 {
   assert ( handle != -1 ) ;
-  return ::send (handle, (const char*)buffer, size, flags);
+  return ::send (handle, (const char*)buffer, size, flags | MSG_NOSIGNAL);
 }
 
 
@@ -600,8 +617,12 @@ int Socket::sendto ( const void * buffer, int size,
                         int flags, const IPAddress* to )
 {
   assert ( handle != -1 ) ;
-  return ::sendto(handle,(const char*)buffer,size,flags,
-                         (const sockaddr*) to->getAddr(), to->getAddrLen());
+  return ::sendto( handle,
+                   (const char*)buffer,
+                   size,
+                   flags | MSG_NOSIGNAL,
+                   (const sockaddr*)to->getAddr(),
+                   to->getAddrLen() );
 }
 
 

simgear/io/sg_binobj.cxx

@@ -43,6 +43,7 @@
 #include <simgear/bucket/newbucket.hxx>
 #include <simgear/misc/sg_path.hxx>
 #include <simgear/math/SGGeometry.hxx>
+#include <simgear/structure/exception.hxx>
 
 #include "lowlevel.hxx"
 #include "sg_binobj.hxx"
@@ -319,15 +320,18 @@ void SGBinObject::read_object( gzFile fp,
     }
 
     if ( sgReadError() ) {
-        cout << "We detected an error reading object properties"  << endl;
-        return;
+        throw sg_exception("Error reading object properties");
+    }
+    
+    size_t indexCount = std::bitset<32>(idx_mask).count();
+    if (indexCount == 0) {
+        throw sg_exception("object index mask has no bits set");
     }
     
     for ( j = 0; j < nelements; ++j ) {
         sgReadUInt( fp, &nbytes );
         if ( sgReadError() ) {
-            cout << "We detected an error reading element size for :" << j << endl;
-            return;
+            throw sg_exception("Error reading element size");
         }
         
         buf.resize( nbytes );
@@ -335,8 +339,7 @@ void SGBinObject::read_object( gzFile fp,
         sgReadBytes( fp, nbytes, ptr );
         
         if ( sgReadError() ) {
-            cout << "We detected an error reading object element:" << j << "bytes="<< nbytes  << endl;
-            return;
+            throw sg_exception("Error reading element bytes");
         }
                 
         int_list vs;
@@ -405,7 +408,7 @@ bool SGBinObject::read_bin( const string& file ) {
             SG_LOG( SG_EVENT, SG_ALERT,
                "ERROR: opening " << file << " or " << filegz << " for reading!");
 
-            return false;
+            throw sg_io_exception("Error opening for reading (and .gz)", sg_location(file));
         }
     }
 
@@ -423,9 +426,7 @@ bool SGBinObject::read_bin( const string& file ) {
     } else {
         // close the file before we return
         gzclose(fp);
-        SG_LOG( SG_EVENT, SG_ALERT,
-           "ERROR: " << file << "has bad header");
-        return false;
+        throw sg_io_exception("Bad BTG magic/version", sg_location(file));
     }
     
     // read creation time
@@ -462,8 +463,7 @@ bool SGBinObject::read_bin( const string& file ) {
      //cout << "Total objects to read = " << nobjects << endl;
 
     if ( sgReadError() ) {
-        cout << "Error while reading header of file " << file << "(.gz)" << endl;
-        return false;
+        throw sg_io_exception("Error reading BTG file header", sg_location(file));
     }
     
     // read in objects
@@ -613,19 +613,13 @@ bool SGBinObject::read_bin( const string& file ) {
         }
         
         if ( sgReadError() ) {
-            cout << "Error while reading object:" << i << " in file " << file << "(.gz)" << endl;
-            return false;
+            throw sg_io_exception("Error while reading object", sg_location(file, i));
         }
     }
 
     // close the file
     gzclose(fp);
 
-    if ( sgReadError() ) {
-        cout << "Error while reading file " << file << "(.gz)" << endl;
-        return false;
-    }
-
     return true;
 }
 
@@ -665,7 +659,7 @@ void SGBinObject::write_objects(gzFile fp, int type, const group_list& verts,
     if (verts.empty()) {
         return;
     }
-    
+        
     unsigned int start = 0, end = 1;
     string m;
     int_list emptyList;
@@ -688,6 +682,13 @@ void SGBinObject::write_objects(gzFile fp, int type, const group_list& verts,
         if ( !normals.empty() && !normals.front().empty()) idx_mask |= SG_IDX_NORMALS;
         if ( !colors.empty() && !colors.front().empty()) idx_mask |= SG_IDX_COLORS;
         if ( !texCoords.empty() && !texCoords.front().empty()) idx_mask |= SG_IDX_TEXCOORDS;
+        
+        if (idx_mask == 0) {
+            SG_LOG(SG_IO, SG_ALERT, "SGBinObject::write_objects: object with material:"
+                << m << "has no indices set");
+        }
+    
+    
         sgWriteChar( fp, (char)SG_INDEX_TYPES );     // property
         sgWriteUInt( fp, 1 );                        // nbytes
         sgWriteChar( fp, idx_mask );
@@ -934,7 +935,7 @@ bool SGBinObject::write_ascii( const string& base, const string& name,
     fprintf(fp, "\n");
 
     // dump individual triangles if they exist
-    if ( tris_v.size() > 0 ) {
+    if ( ! tris_v.empty() ) {
         fprintf(fp, "# triangle groups\n");
 
         int start = 0;
@@ -982,7 +983,7 @@ bool SGBinObject::write_ascii( const string& base, const string& name,
     }
 
     // dump triangle groups
-    if ( strips_v.size() > 0 ) {
+    if ( ! strips_v.empty() ) {
         fprintf(fp, "# triangle strips\n");
 
         int start = 0;

simgear/io/sg_netChannel.cxx

@@ -41,8 +41,6 @@
 
 namespace simgear  {
 
-static NetChannel* channels = 0 ;
-
 NetChannel::NetChannel ()
 {
   closed = true ;
@@ -51,31 +49,14 @@ NetChannel::NetChannel ()
   accepting = false ;
   write_blocked = false ;
   should_delete = false ;
-
-  next_channel = channels ;
-  channels = this ;
+  poller = NULL;
 }
   
 NetChannel::~NetChannel ()
 {
   close();
-
-  NetChannel* prev = NULL ;
-
-  for ( NetChannel* ch = channels; ch != NULL;
-                    ch = ch -> next_channel )
-  {
-    if (ch == this)
-    {
-      ch = ch -> next_channel ;
-      if ( prev != NULL )
-        prev -> next_channel = ch ;
-      else
-        channels = ch ;
-      next_channel = 0 ;
-      break;
-    }
-    prev = ch ;
+  if (poller) {
+      poller->removeChannel(this);
   }
 }
   
@@ -232,89 +213,6 @@ NetChannel::handleResolve()
     }
 }
 
-bool
-NetChannel::poll (unsigned int timeout)
-{
-  if (!channels)
-    return false ;
-  
-  enum { MAX_SOCKETS = 256 } ;
-  Socket* reads [ MAX_SOCKETS+1 ] ;
-  Socket* writes [ MAX_SOCKETS+1 ] ;
-  Socket* deletes [ MAX_SOCKETS+1 ] ;
-  int nreads = 0 ;
-  int nwrites = 0 ;
-  int ndeletes = 0 ;
-  int nopen = 0 ;
-  NetChannel* ch;
-  for (  ch = channels; ch != NULL; ch = ch -> next_channel )
-  {
-    if ( ch -> should_delete )
-    {
-      assert(ndeletes<MAX_SOCKETS);
-      deletes[ndeletes++] = ch ;
-    }
-    else if ( ! ch -> closed )
-    {
-      if (ch -> resolving_host )
-      {
-          ch -> handleResolve();
-          continue;
-      }
-      
-      nopen++ ;
-      if (ch -> readable()) {
-        assert(nreads<MAX_SOCKETS);
-        reads[nreads++] = ch ;
-      }
-      if (ch -> writable()) {
-        assert(nwrites<MAX_SOCKETS);
-        writes[nwrites++] = ch ;
-      }
-    }
-  }
-  reads[nreads] = NULL ;
-  writes[nwrites] = NULL ;
-  deletes[ndeletes] = NULL ;
-
-  int i ;
-  for ( i=0; deletes[i]; i++ )
-  {
-    ch = (NetChannel*)deletes[i];
-    delete ch ;
-  }
-
-  if (!nopen)
-    return false ;
-  if (!nreads && !nwrites)
-    return true ; //hmmm- should we shutdown?
-
-  Socket::select (reads, writes, timeout) ;
-
-  for ( i=0; reads[i]; i++ )
-  {
-    ch = (NetChannel*)reads[i];
-    if ( ! ch -> closed )
-      ch -> handleReadEvent();
-  }
-
-  for ( i=0; writes[i]; i++ )
-  {
-    ch = (NetChannel*)writes[i];
-    if ( ! ch -> closed )
-      ch -> handleWriteEvent();
-  }
-
-  return true ;
-}
-
-void
-NetChannel::loop (unsigned int timeout)
-{
-  while ( poll (timeout) ) ;
-}
-
-
 void NetChannel::handleRead (void) {
   SG_LOG(SG_IO, SG_WARN, "Network:" << getHandle() << ": unhandled read");
 }
@@ -336,4 +234,114 @@ void NetChannel::handleError (int error)
     }
 }
 
+void
+NetChannelPoller::addChannel(NetChannel* channel)
+{
+    assert(channel);
+    assert(channel->poller == NULL);
+        
+    channel->poller = this;
+    channels.push_back(channel);
+}
+
+void
+NetChannelPoller::removeChannel(NetChannel* channel)
+{
+    assert(channel);
+    assert(channel->poller == this);
+    channel->poller = NULL;
+    
+    ChannelList::iterator it = channels.begin();
+    for (; it != channels.end(); ++it) {
+        if (*it == channel) {
+            channels.erase(it);
+            return;
+        }
+    }
+}
+
+bool
+NetChannelPoller::poll(unsigned int timeout)
+{
+    if (channels.empty()) {
+        return false;
+    }
+    
+    enum { MAX_SOCKETS = 256 } ;
+    Socket* reads [ MAX_SOCKETS+1 ] ;
+    Socket* writes [ MAX_SOCKETS+1 ] ;
+    int nreads = 0 ;
+    int nwrites = 0 ;
+    int nopen = 0 ;
+    
+    ChannelList::iterator it = channels.begin();
+    while( it != channels.end() )
+    {
+        NetChannel* ch = *it;
+        if ( ch -> should_delete )
+        {
+            // avoid the channel trying to remove itself from us, or we get
+            // bug http://code.google.com/p/flightgear-bugs/issues/detail?id=1144
+            ch->poller = NULL;
+            delete ch;
+            it = channels.erase(it);
+            continue;
+        }
+
+        ++it; // we've copied the pointer into ch
+        if ( ch->closed ) { 
+            continue;
+        }
+
+        if (ch -> resolving_host )
+        {
+            ch -> handleResolve();
+            continue;
+        }
+      
+        nopen++ ;
+        if (ch -> readable()) {
+          assert(nreads<MAX_SOCKETS);
+          reads[nreads++] = ch ;
+        }
+        if (ch -> writable()) {
+          assert(nwrites<MAX_SOCKETS);
+          writes[nwrites++] = ch ;
+        }
+    } // of array-filling pass
+    
+    reads[nreads] = NULL ;
+    writes[nwrites] = NULL ;
+
+    if (!nopen)
+      return false ;
+    if (!nreads && !nwrites)
+      return true ; //hmmm- should we shutdown?
+
+    Socket::select (reads, writes, timeout) ;
+
+    for ( int i=0; reads[i]; i++ )
+    {
+      NetChannel* ch = (NetChannel*)reads[i];
+      if ( ! ch -> closed )
+        ch -> handleReadEvent();
+    }
+
+    for ( int i=0; writes[i]; i++ )
+    {
+      NetChannel* ch = (NetChannel*)writes[i];
+      if ( ! ch -> closed )
+        ch -> handleWriteEvent();
+    }
+
+    return true ;
+}
+
+void
+NetChannelPoller::loop (unsigned int timeout)
+{
+  while ( poll (timeout) ) ;
+}
+
+
 } // of namespace simgear