Add some plumbing for the color management of canvases

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.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/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h"
 
 #include "bindings/modules/v8/OffscreenCanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerSettings.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/StaticBitmapImage.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "platform/graphics/gpu/AcceleratedImageBufferSurface.h"
 #include "wtf/Assertions.h"
 
 #define UNIMPLEMENTED ASSERT_NOT_REACHED
 
 namespace blink {
 
 OffscreenCanvasRenderingContext2D::~OffscreenCanvasRenderingContext2D()
 {
 }
 
 OffscreenCanvasRenderingContext2D::OffscreenCanvasRenderingContext2D(ScriptState* scriptState, OffscreenCanvas* canvas, const CanvasContextCreationAttributes& attrs)
-    : CanvasRenderingContext(nullptr, canvas)
-    , m_hasAlpha(attrs.alpha())
+    : CanvasRenderingContext(nullptr, canvas, attrs)
 {
     ExecutionContext* executionContext = scriptState->getExecutionContext();
     if (executionContext->isDocument()) {
         if (toDocument(executionContext)->settings()->disableReadingFromCanvas())
             canvas->setDisableReadingFromCanvasTrue();
         return;
     }
 
     WorkerSettings* workerSettings = toWorkerGlobalScope(executionContext)->workerSettings();
     if (workerSettings && workerSettings->disableReadingFromCanvas())
@@ skipping 47 matching lines @@
 {
     if (!isMainThread())
         return false; // Add support on Workers crbug.com/
     return RuntimeEnabledFeatures::accelerated2dCanvasEnabled();
 }
 
 ImageBuffer* OffscreenCanvasRenderingContext2D::imageBuffer() const
 {
     if (!m_imageBuffer) {
         IntSize surfaceSize(width(), height());
-        OpacityMode opacityMode = m_hasAlpha ? NonOpaque : Opaque;
+        OpacityMode opacityMode = hasAlpha() ? NonOpaque : Opaque;
         std::unique_ptr<ImageBufferSurface> surface;
         if (shouldAccelerate(surfaceSize)) {
             surface.reset(new AcceleratedImageBufferSurface(surfaceSize, opacityMode));
         }
 
         if (!surface || !surface->isValid()) {
             surface.reset(new UnacceleratedImageBufferSurface(surfaceSize, opacityMode, InitializeImagePixels));
         }
 
         OffscreenCanvasRenderingContext2D* nonConstThis = const_cast<OffscreenCanvasRenderingContext2D*>(this);
@@ skipping 86 matching lines @@
 bool OffscreenCanvasRenderingContext2D::isContextLost() const
 {
     return false;
 }
 
 bool OffscreenCanvasRenderingContext2D::isPaintable() const
 {
     return this->imageBuffer();
 }
 }