Support uploads of sub-rectangles of canvases to 2D and 3D textures.

third_party/WebKit/Source/platform/graphics/ImageBuffer.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 123 matching lines @@
   void putByteArray(Multiply,
                     const unsigned char* source,
                     const IntSize& sourceSize,
                     const IntRect& sourceRect,
                     const IntPoint& destPoint);
 
   AffineTransform baseTransform() const { return AffineTransform(); }
   WebLayer* platformLayer() const;
 
   // Destroys the TEXTURE_2D binding for the active texture unit of the passed
-  // context.
+  // context. Assumes the destination texture has already been allocated.
   // FIXME: Current implementations of this method only work with textures that
   // are RGB or RGBA format, UNSIGNED_BYTE type and level 0, as specified in
   // Extensions3D::canUseCopyTextureCHROMIUM().
   bool copyToPlatformTexture(gpu::gles2::GLES2Interface*,
                              GLuint texture,
                              GLenum internalFormat,
                              GLenum destType,
                              GLint level,
                              bool premultiplyAlpha,
-                             bool flipY);
+                             bool flipY,
+                             const IntPoint& destPoint,
+                             const IntRect& sourceSubRectangle);
 
   bool copyRenderingResultsFromDrawingBuffer(DrawingBuffer*,
                                              SourceDrawingBuffer);
 
   void flush(FlushReason);     // Process deferred draw commands immediately.
   void flushGpu(FlushReason);  // Like flush(), but flushes all the way down to
                                // the GPU context if the surface is accelerated.
 
   void notifySurfaceInvalid();
 
@@ skipping 49 matching lines @@
   int height() const { return m_size.height(); }
   int width() const { return m_size.width(); }
 
   const unsigned char* m_data;
   const IntSize m_size;
 };
 
 }  // namespace blink
 
 #endif  // ImageBuffer_h