Added Image::g/setOrigin to help movie plugins tell applications that the imagery

is not the usual OpenGL BOTTOM_LEFT orientation, but with the origin TOP_LEFT.  This
allows geometry setup code to flip the t tex coord to render the movie the correct way up.

src/osg/Image.cpp

@@ -32,6 +32,7 @@ Image::Image()
     setDataVariance(STATIC); 
 
     _fileName               = "";
+    _origin                 = BOTTOM_LEFT;
     _s = _t = _r            = 0;
     _internalTextureFormat  = 0;
     _pixelFormat            = (unsigned int)0;
@@ -47,6 +48,7 @@ Image::Image()
 Image::Image(const Image& image,const CopyOp& copyop):
     Object(image,copyop),
     _fileName(image._fileName),
+    _origin(image._origin),
     _s(image._s), _t(image._t), _r(image._r),
     _internalTextureFormat(image._internalTextureFormat),
     _pixelFormat(image._pixelFormat),

src/osgPlugins/quicktime/QuicktimeImageStream.cpp

@@ -42,6 +42,8 @@ int QuicktimeImageStream::_qtInstanceCount = 0;
 // Constructor: setup and start thread
 QuicktimeImageStream::QuicktimeImageStream(std::string fileName) : ImageStream()
 {
+    setOrigin(osg::Image::TOP_LEFT);
+
     _len = 0;
     _movieData = new MovieData();
 

src/osgPlugins/xine/ReaderWriterXine.cpp

@@ -30,7 +30,10 @@ class XineImageStream : public osg::ImageStream
             _visual(0),
             _stream(0),
             _event_queue(0),
-            _ready(false) {}
+            _ready(false)
+        {
+            setOrigin(osg::Image::TOP_LEFT);
+        }
 
         /** Copy constructor using CopyOp to manage deep vs shallow copy. */
         XineImageStream(const XineImageStream& image,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):