Added search path to osgText::readFontFile.

src/osgText/Font.cpp

@@ -16,18 +16,58 @@
 #include <osg/State>
 #include <osg/Notify>
 #include <osgDB/ReadFile>
+#include <osgDB/FileUtils>
 #include <osg/GLU>
 
 using namespace osgText;
 
+std::string findFontFile(const std::string& str)
+{
+    // try looking in OSGFILEPATH etc first for fonts.
+    std::string filename = osgDB::findDataFile(str);
+    if (!filename.empty()) return std::string(filename);
+
+
+    static osgDB::FilePathList s_FontFilePath;
+    static bool initialized = false;
+    if (!initialized)
+    {
+        initialized = true;
+    #if defined(WIN32)
+        osgDB::Registry::convertStringPathIntoFilePathList(
+            ".;C:/winnt/fonts;C:/windows/fonts",
+            s_FontFilePath);
+
+        char *ptr;
+        if ((ptr = getenv( "windir" )))
+        {
+            s_FontFilePath.push_back(ptr);
+        }
+    #else
+        osgDB::Registry::convertStringPathIntoFilePathList(
+            ".:/usr/share/fonts/ttf:/usr/share/fonts/ttf/western:/usr/share/fonts/ttf/decoratives",
+            s_FontFilePath);
+    #endif
+    }
+
+    filename = osgDB::findFileInPath(str,s_FontFilePath);
+    if (!filename.empty()) return filename;
+
+    osg::notify(osg::WARN)<<"Warning: font file \""<<str<<"\" not found."<<std::endl;    
+    return std::string();
+}
+
 osgText::Font* osgText::readFontFile(const std::string& filename)
 {
+    std::string foundFile = findFontFile(filename);
+    if (foundFile.empty()) return 0;
+
     osg::Object* object = osgDB::readObjectFile(filename);
-    
+
     // if the object is a font then return it.
     osgText::Font* font = dynamic_cast<osgText::Font*>(object);
     if (font) return font;
-    
+
     // otherwise if the object has zero references then delete it by doing another unref().
     if (object && object->referenceCount()==0) object->unref();
     return 0;