Add some plumbing for the color management of canvases

third_party/WebKit/Source/modules/imagebitmap/ImageBitmapRenderingContext.cpp

 // Copyright 2016 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 "modules/imagebitmap/ImageBitmapRenderingContext.h"
 
 #include "bindings/modules/v8/RenderingContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/StaticBitmapImage.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkSurface.h"
 
 namespace blink {
 
-ImageBitmapRenderingContext::ImageBitmapRenderingContext(HTMLCanvasElement* canvas, CanvasContextCreationAttributes attrs, Document& document)
-    : CanvasRenderingContext(canvas)
-    , m_hasAlpha(attrs.alpha())
+ImageBitmapRenderingContext::ImageBitmapRenderingContext(HTMLCanvasElement* canvas, const CanvasContextCreationAttributes& attrs, Document& document)
+    : CanvasRenderingContext(canvas, nullptr, attrs)
 { }
 
 ImageBitmapRenderingContext::~ImageBitmapRenderingContext() { }
 
 void ImageBitmapRenderingContext::setCanvasGetContextResult(RenderingContext& result)
 {
     result.setImageBitmapRenderingContext(this);
 }
 
 void ImageBitmapRenderingContext::transferFromImageBitmap(ImageBitmap* imageBitmap)
@@ skipping 17 matching lines @@
     canvas()->didDraw(FloatRect(FloatPoint(), FloatSize(m_image->width(), m_image->height())));
 }
 
 bool ImageBitmapRenderingContext::paint(GraphicsContext& gc, const IntRect& r)
 {
     if (!m_image)
         return true;
 
     // With impl-side painting, it is unsafe to use a gpu-backed SkImage
     ASSERT(!m_image->imageForCurrentFrame()->isTextureBacked());
-    gc.drawImage(m_image.get(), r, nullptr, m_hasAlpha ? SkXfermode::kSrcOver_Mode : SkXfermode::kSrc_Mode);
+    gc.drawImage(m_image.get(), r, nullptr, creationAttributes().alpha() ? SkXfermode::kSrcOver_Mode : SkXfermode::kSrc_Mode);
 
     return true;
 }
 
 CanvasRenderingContext* ImageBitmapRenderingContext::Factory::create(HTMLCanvasElement* canvas, const CanvasContextCreationAttributes& attrs, Document& document)
 {
     if (!RuntimeEnabledFeatures::experimentalCanvasFeaturesEnabled())
         return nullptr;
     return new ImageBitmapRenderingContext(canvas, attrs, document);
 }
 
 void ImageBitmapRenderingContext::stop()
 {
     m_image.clear();
 }
 
 } // blink