Avoid copy pixel data in texImage2D(ImageBitmap)

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

 // 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.
 
 #include "platform/graphics/gpu/WebGLImageConversion.h"
 
 #include "platform/CheckedInt.h"
 #include "platform/graphics/ImageObserver.h"
 #include "platform/graphics/cpu/arm/WebGLImageConversionNEON.h"
 #include "platform/graphics/cpu/x86/WebGLImageConversionSSE.h"
@@ skipping 2295 matching lines @@
 
     if (!packPixels(reinterpret_cast<const uint8_t*>(pixels), sourceFormat, width, height, sourceUnpackAlignment, format, type, alphaOp, data.data(), flipY))
         return false;
     if (ImageObserver *observer = image->getImageObserver())
         observer->didDraw(image);
     return true;
 }
 
 bool WebGLImageConversion::extractImageData(
     const uint8_t* imageData,
+    DataFormat sourceDataFormat,
     const IntSize& imageDataSize,
     GLenum format,
     GLenum type,
     bool flipY,
     bool premultiplyAlpha,
     Vector<uint8_t>& data)
 {
     if (!imageData)
         return false;
     int width = imageDataSize.width();
     int height = imageDataSize.height();
 
     unsigned packedSize;
     // Output data is tightly packed (alignment == 1).
     PixelStoreParams params;
     params.alignment = 1;
     if (computeImageSizeInBytes(format, type, width, height, 1, params, &packedSize, 0, 0) != GL_NO_ERROR)
         return false;
     data.resize(packedSize);
 
-    if (!packPixels(imageData, DataFormatRGBA8, width, height, 0, format, type, premultiplyAlpha ? AlphaDoPremultiply : AlphaDoNothing, data.data(), flipY))
+    if (!packPixels(imageData, sourceDataFormat, width, height, 0, format, type, premultiplyAlpha ? AlphaDoPremultiply : AlphaDoNothing, data.data(), flipY))
         return false;
 
     return true;
 }
 
 bool WebGLImageConversion::extractTextureData(
     unsigned width,
     unsigned height,
     GLenum format, GLenum type,
     unsigned unpackAlignment,
@@ skipping 56 matching lines @@
     }
 
     FormatConverter converter(width, height, sourceData, destinationData, srcStride, dstStride);
     converter.convert(sourceDataFormat, dstDataFormat, alphaOp);
     if (!converter.Success())
         return false;
     return true;
 }
 
 } // namespace blink