Clean up transform methods in GraphicsContext.

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 208 matching lines @@
 }
 
 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.
+    // FIXME: See crbug.com/382491. This scale does not reflect compositor applied
+    // scale factors, such a High DPI or device zoom.
     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());
 
@@ skipping 30 matching lines @@
     }
 
     FloatSize scale(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height());
 
     // We can only draw the entire frame, clipped to the rect we want. So compute where the top left
     // of the image would be if we were drawing without clipping, and translate accordingly.
     FloatSize topLeftOffset(srcRect.location().x() * scale.width(), srcRect.location().y() * scale.height());
     FloatPoint destOffset = dstRect.location() - topLeftOffset;
 
     context->translate(destOffset.x(), destOffset.y());
-    context->scale(scale);
+    context->scale(scale.width(), scale.height());
 
     FrameView* view = frameView();
     view->resize(containerSize());
 
     if (!m_url.isEmpty())
         view->scrollToFragment(m_url);
 
     if (view->needsLayout())
         view->layout();
 
@@ skipping 132 matching lines @@
 
     return m_page;
 }
 
 String SVGImage::filenameExtension() const
 {
     return "svg";
 }
 
 }