support uploading sub-rectangles of ImageData

third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebGLImageConversion_h
 #define WebGLImageConversion_h
 
 #include "platform/PlatformExport.h"
 #include "platform/graphics/Image.h"
 #include "platform/graphics/skia/ImagePixelLocker.h"
@@ skipping 211 matching lines @@
                             unsigned sourceUnpackAlignment,
                             Vector<uint8_t>& data);
 
   // Extracts the contents of the given ImageData into the passed Vector,
   // packing the pixel data according to the given format and type,
   // and obeying the flipY and premultiplyAlpha flags. Returns true
   // upon success.
   static bool extractImageData(const uint8_t*,
                                DataFormat sourceDataFormat,
                                const IntSize&,
+                               const IntRect&,
                                GLenum format,
                                GLenum type,
                                bool flipY,
                                bool premultiplyAlpha,
                                Vector<uint8_t>& data);
 
   // Helper function which extracts the user-supplied texture
   // data, applying the flipY and premultiplyAlpha parameters.
   // If the data is not tightly packed according to the passed
   // unpackAlignment, the output data will be tightly packed.
@@ skipping 35 matching lines @@
                            uint8_t* destinationData);
   static void packPixels(const uint8_t* sourceData,
                          DataFormat sourceDataFormat,
                          unsigned pixelsPerRow,
                          uint8_t* destinationData);
 };
 
 }  // namespace blink
 
 #endif  // WebGLImageConversion_h