Add drawImage() originClean() getSecurityOrigin() to OffscreenCanvas

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/UnionTypesModules.h"
 #include "core/frame/ImageBitmap.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/StaticBitmapImage.h"
@@ skipping 15 matching lines @@
 
 DEFINE_TRACE(OffscreenCanvasRenderingContext2D)
 {
     CanvasRenderingContext::trace(visitor);
     BaseRenderingContext2D::trace(visitor);
 }
 
 // BaseRenderingContext2D implementation
 bool OffscreenCanvasRenderingContext2D::originClean() const
 {
-    return m_originClean;
+    return getOffscreenCanvas()->originClean();
 }
 
 void OffscreenCanvasRenderingContext2D::setOriginTainted()
 {
-    m_originClean = false;
+    return getOffscreenCanvas()->setOriginTainted();
 }
 
 bool OffscreenCanvasRenderingContext2D::wouldTaintOrigin(CanvasImageSource* source, ScriptState* scriptState)
 {
     if (scriptState->getExecutionContext()->isWorkerGlobalScope()) {
         // Currently, we only support passing in ImageBitmap as source image in
         // drawImage() or createPattern() in a OffscreenCanvas2d in worker.
         ASSERT(source->isImageBitmap());
         // ImageBitmap wouldTaintOrigin doesn't consider destinationSecurityOrigin.
         return source->wouldTaintOrigin(nullptr);
@@ skipping 32 matching lines @@
     return m_imageBuffer.get();
 }
 
 ImageBitmap* OffscreenCanvasRenderingContext2D::transferToImageBitmap(ExceptionState& exceptionState)
 {
     if (!imageBuffer())
         return nullptr;
     // TODO: crbug.com/593514 Add support for GPU rendering
     RefPtr<SkImage> skImage = m_imageBuffer->newSkImageSnapshot(PreferNoAcceleration, SnapshotReasonUnknown);
     RefPtr<StaticBitmapImage> image = StaticBitmapImage::create(skImage.release());
+    image->setOriginClean(this->originClean());

[Justin Novosad, 2016/04/29 04:08:55]

This needs a test. Something like: draw a tainted ImageBitmap into an OCRC2D on
a worker, call tranferToImageBitmap, transfer the image bitmap back to the main
thread; draw it to a canvas; try to call getImageData().

     m_imageBuffer.clear(); // "Transfer" means no retained buffer
     return ImageBitmap::create(image.release());
 }
 
 void OffscreenCanvasRenderingContext2D::setOffscreenCanvasGetContextResult(OffscreenRenderingContext& result)
 {
     result.setOffscreenCanvasRenderingContext2D(this);
 }
 
 bool OffscreenCanvasRenderingContext2D::parseColorOrCurrentColor(Color& color, const String& colorString) const
@@ skipping 52 matching lines @@
     }
 #endif
 }
 
 bool OffscreenCanvasRenderingContext2D::isContextLost() const
 {
     return false;
 }
 
 }