Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/SVGImagePainter.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 "config.h"
 #include "core/paint/SVGImagePainter.h"
 
 #include "core/layout/ImageQualityController.h"
 #include "core/layout/LayoutImageResource.h"
 #include "core/layout/svg/LayoutSVGImage.h"
@@ skipping 15 matching lines @@
         || m_layoutSVGImage.style()->visibility() == HIDDEN
         || !m_layoutSVGImage.imageResource()->hasImage())
         return;
 
     FloatRect boundingBox = m_layoutSVGImage.paintInvalidationRectInLocalCoordinates();
     if (!paintInfo.cullRect().intersectsCullRect(m_layoutSVGImage.localToParentTransform(), boundingBox))
         return;
 
     PaintInfo paintInfoBeforeFiltering(paintInfo);
     // Images cannot have children so do not call updateCullRect.
-    TransformRecorder transformRecorder(*paintInfoBeforeFiltering.context, m_layoutSVGImage, m_layoutSVGImage.localToParentTransform());
+    TransformRecorder transformRecorder(paintInfoBeforeFiltering.context, m_layoutSVGImage, m_layoutSVGImage.localToParentTransform());
     {
         SVGPaintContext paintContext(m_layoutSVGImage, paintInfoBeforeFiltering);
-        if (paintContext.applyClipMaskAndFilterIfNecessary() && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintContext.paintInfo().context, m_layoutSVGImage, paintContext.paintInfo().phase, LayoutPoint())) {
-            LayoutObjectDrawingRecorder recorder(*paintContext.paintInfo().context, m_layoutSVGImage, paintContext.paintInfo().phase, boundingBox, LayoutPoint());
+        if (paintContext.applyClipMaskAndFilterIfNecessary() && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintContext.paintInfo().context, m_layoutSVGImage, paintContext.paintInfo().phase, LayoutPoint())) {
+            LayoutObjectDrawingRecorder recorder(paintContext.paintInfo().context, m_layoutSVGImage, paintContext.paintInfo().phase, boundingBox, LayoutPoint());
             paintForeground(paintContext.paintInfo());
         }
     }
 
     if (m_layoutSVGImage.style()->outlineWidth()) {
         PaintInfo outlinePaintInfo(paintInfoBeforeFiltering);
         outlinePaintInfo.phase = PaintPhaseSelfOutline;
         ObjectPainter(m_layoutSVGImage).paintOutline(outlinePaintInfo, LayoutPoint(boundingBox.location()));
     }
 }
 
 void SVGImagePainter::paintForeground(const PaintInfo& paintInfo)
 {
     const LayoutImageResource* imageResource = m_layoutSVGImage.imageResource();
     IntSize imageViewportSize = expandedIntSize(computeImageViewportSize());
     if (imageViewportSize.isEmpty())
         return;
 
     RefPtr<Image> image = imageResource->image(imageViewportSize, m_layoutSVGImage.style()->effectiveZoom());
     FloatRect destRect = m_layoutSVGImage.objectBoundingBox();
     FloatRect srcRect(0, 0, image->width(), image->height());
 
     SVGImageElement* imageElement = toSVGImageElement(m_layoutSVGImage.element());
     imageElement->preserveAspectRatio()->currentValue()->transformRect(destRect, srcRect);
 
     InterpolationQuality interpolationQuality = InterpolationDefault;
-    interpolationQuality = ImageQualityController::imageQualityController()->chooseInterpolationQuality(paintInfo.context, &m_layoutSVGImage, image.get(), image.get(), LayoutSize(destRect.size()));
+    interpolationQuality = ImageQualityController::imageQualityController()->chooseInterpolationQuality(m_layoutSVGImage, image.get(), image.get(), LayoutSize(destRect.size()));
 
-    InterpolationQuality previousInterpolationQuality = paintInfo.context->imageInterpolationQuality();
-    paintInfo.context->setImageInterpolationQuality(interpolationQuality);
-    paintInfo.context->drawImage(image.get(), destRect, srcRect, SkXfermode::kSrcOver_Mode);
-    paintInfo.context->setImageInterpolationQuality(previousInterpolationQuality);
+    InterpolationQuality previousInterpolationQuality = paintInfo.context.imageInterpolationQuality();
+    paintInfo.context.setImageInterpolationQuality(interpolationQuality);
+    paintInfo.context.drawImage(image.get(), destRect, srcRect, SkXfermode::kSrcOver_Mode);
+    paintInfo.context.setImageInterpolationQuality(previousInterpolationQuality);
 }
 
 FloatSize SVGImagePainter::computeImageViewportSize() const
 {
     ASSERT(m_layoutSVGImage.imageResource()->hasImage());
 
     if (toSVGImageElement(m_layoutSVGImage.element())->preserveAspectRatio()->currentValue()->align() != SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_NONE)
         return m_layoutSVGImage.objectBoundingBox().size();
 
     ImageResource* cachedImage = m_layoutSVGImage.imageResource()->cachedImage();
 
     // Images with preserveAspectRatio=none should force non-uniform
     // scaling. This can be achieved by setting the image's container size to
     // its viewport size (i.e. if a viewBox is available - use that - else use intrinsic size.)
     // See: http://www.w3.org/TR/SVG/single-page.html, 7.8 The 'preserveAspectRatio' attribute.
     Length intrinsicWidth;
     Length intrinsicHeight;
     FloatSize intrinsicRatio;
     cachedImage->computeIntrinsicDimensions(intrinsicWidth, intrinsicHeight, intrinsicRatio);
     return intrinsicRatio;
 }
 
 } // namespace blink