Intoduce new osgWidget::PdfReader and osgWidget::VncClient front ends to osgWidget,

with new pdf plugin and updated vnc plugin that now support these front ends.

Updated osgpdf and osgvnc examples to new these new interfaces.

src/osgWidget/VncClient.cpp

@@ -0,0 +1,64 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2008 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * 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 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osgDB/ReadFile>
+#include <osgViewer/ViewerEventHandlers>
+#include <osgWidget/VncClient>
+
+using namespace osgWidget;
+
+VncClient::VncClient(const std::string& hostname, GeometryHints hints)
+{
+    connect(hostname, hints);
+}
+
+bool VncClient::assign(VncImage* vncImage, GeometryHints hints)
+{
+    if (!vncImage) return false;
+    
+    _vncImage = vncImage;
+
+    bool flip = _vncImage->getOrigin()==osg::Image::TOP_LEFT;
+
+    osg::Geometry* pictureQuad = osg::createTexturedQuadGeometry(hints.position, hints.widthVec, hints.heightVec,
+                                       0.0f, flip ? 1.0f : 0.0f , 1.0f, flip ? 0.0f : 1.0f);
+
+    osg::Texture2D* texture = new osg::Texture2D(_vncImage.get());
+    texture->setResizeNonPowerOfTwoHint(false);
+    texture->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
+    texture->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
+    texture->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
+
+    pictureQuad->getOrCreateStateSet()->setTextureAttributeAndModes(0,
+                texture,
+                osg::StateAttribute::ON);
+
+    pictureQuad->setEventCallback(new osgViewer::InteractiveImageHandler(_vncImage.get()));
+
+    addDrawable(pictureQuad);
+
+    return true;
+}
+
+bool VncClient::connect(const std::string& hostname, GeometryHints hints)
+{
+    osg::ref_ptr<osg::Image> image = osgDB::readImageFile(hostname+".vnc");
+    return assign(dynamic_cast<VncImage*>(image.get()));
+}
+
+void VncClient::close()
+{
+    if (!_vncImage) return;
+    
+    _vncImage->close();
+}