Refactoring ImageBuffer to decouple it from Canvas2DLayerBridge

Source/core/svg/graphics/SVGImage.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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 174 matching lines @@
     scaledSrc.setSize(adjustedSrcSize);
 
     draw(context, dstRect, scaledSrc, compositeOp, blendMode);
 }
 
 PassRefPtr<NativeImageSkia> SVGImage::nativeImageForCurrentFrame()
 {
     if (!m_page)
         return 0;
 
-    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(size(), 1);
-    if (!buffer) // failed to allocate image
+    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(size());
+    if (!buffer)
         return 0;
 
     drawForContainer(buffer->context(), size(), 1, rect(), rect(), CompositeSourceOver, blink::WebBlendModeNormal);
 
     // FIXME: WK(Bug 113657): We should use DontCopyBackingStore here.
     return buffer->copyImage(CopyBackingStore)->nativeImageForCurrentFrame();
 }
 
 void SVGImage::drawPatternForContainer(GraphicsContext* context, const FloatSize containerSize, float zoom, const FloatRect& srcRect,
     const FloatSize& scale, const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& dstRect, blink::WebBlendMode blendMode, const IntSize& repeatSpacing)
 {
     FloatRect zoomedContainerRect = FloatRect(FloatPoint(), containerSize);
     zoomedContainerRect.scale(zoom);
 
     // The ImageBuffer size needs to be scaled to match the final resolution.
     // FIXME: No need to get the full CTM here, we just need the scale.
     AffineTransform transform = context->getCTM();
     FloatSize imageBufferScale = FloatSize(transform.xScale(), transform.yScale());
     ASSERT(imageBufferScale.width());
     ASSERT(imageBufferScale.height());
 
     FloatSize scaleWithoutCTM(scale.width() / imageBufferScale.width(), scale.height() / imageBufferScale.height());
 
     FloatRect imageBufferSize = zoomedContainerRect;
     imageBufferSize.scale(imageBufferScale.width(), imageBufferScale.height());
 
-    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(expandedIntSize(imageBufferSize.size()), 1);
+    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(expandedIntSize(imageBufferSize.size()));
     if (!buffer) // Failed to allocate buffer.
         return;
+
     drawForContainer(buffer->context(), containerSize, zoom, imageBufferSize, zoomedContainerRect, CompositeSourceOver, blink::WebBlendModeNormal);
     RefPtr<Image> image = buffer->copyImage(DontCopyBackingStore, Unscaled);
 
     // Adjust the source rect and transform due to the image buffer's scaling.
     FloatRect scaledSrcRect = srcRect;
     scaledSrcRect.scale(imageBufferScale.width(), imageBufferScale.height());
 
     image->drawPattern(context, scaledSrcRect, scaleWithoutCTM, phase, compositeOp, dstRect, blendMode, repeatSpacing);
 }
 
@@ skipping 172 matching lines @@
 
     return m_page;
 }
 
 String SVGImage::filenameExtension() const
 {
     return "svg";
 }
 
 }