Make SVG images for custom CSS cursors appear sharp on retina displays

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 34 matching lines @@
 #include "core/svg/SVGImageElement.h"
 #include "core/svg/SVGSVGElement.h"
 #include "core/svg/graphics/SVGImageChromeClient.h"
 #include "platform/LengthFunctions.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/ImageObserver.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
-SVGImage::SVGImage(ImageObserver* observer)
+SVGImage::SVGImage(ImageObserver* observer, float deviceScaleFactor)
     : Image(observer)
+    , m_deviceScaleFactor(deviceScaleFactor)
 {
 }
 
 SVGImage::~SVGImage()
 {
     if (m_page) {
         // Store m_page in a local variable, clearing m_page, so that SVGImageChromeClient knows we're destructed.
         OwnPtr<Page> currentPage = m_page.release();
         currentPage->mainFrame()->loader().frameDetached(); // Break both the loader and view references to the frame
     }
@@ skipping 113 matching lines @@
     scaledSrc.scale(1 / zoom);
 
     // Compensate for the container size rounding by adjusting the source rect.
     FloatSize adjustedSrcSize = scaledSrc.size();
     adjustedSrcSize.scale(roundedContainerSize.width() / containerSize.width(), roundedContainerSize.height() / containerSize.height());
     scaledSrc.setSize(adjustedSrcSize);
 
     draw(context, dstRect, scaledSrc, compositeOp, blendMode);
 }
 
-PassRefPtr<NativeImageSkia> SVGImage::nativeImageForCurrentFrame()
+PassRefPtr<NativeImageSkia> SVGImage::nativeImageForCurrentFrame(ScaleHint hint)
 {
     if (!m_page)
         return 0;
 
-    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(size(), 1);
+    IntSize scaledSize = size();
+    float scale = hint == PreferDeviceScale ? m_deviceScaleFactor : 1;
+    scaledSize.scale(scale);
+
+    OwnPtr<ImageBuffer> buffer = ImageBuffer::create(scaledSize, 1);
     if (!buffer) // failed to allocate image
         return 0;
 
-    drawForContainer(buffer->context(), size(), 1, rect(), rect(), CompositeSourceOver, blink::WebBlendModeNormal);
+    drawForContainer(buffer->context(), size(), 1, FloatRect(IntRect(IntPoint(), scaledSize)), 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);
@@ skipping 198 matching lines @@
 
     return m_page;
 }
 
 String SVGImage::filenameExtension() const
 {
     return "svg";
 }
 
 }