Refactoring source image usage in CanvasRenderingContext2D

Source/core/html/HTMLVideoElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #include "config.h"
 #include "core/html/HTMLVideoElement.h"
 
 #include "CSSPropertyNames.h"
 #include "HTMLNames.h"
 #include "bindings/v8/ExceptionState.h"
 #include "core/dom/Attribute.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/html/HTMLImageLoader.h"
+#include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/frame/Settings.h"
 #include "core/rendering/RenderImage.h"
 #include "core/rendering/RenderVideo.h"
 #include "platform/UserGestureIndicator.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
@@ skipping 120 matching lines @@
 }
 
 void HTMLVideoElement::updateDisplayState()
 {
     if (posterImageURL().isEmpty())
         setDisplayMode(Video);
     else if (displayMode() < Poster)
         setDisplayMode(Poster);
 }
 
-void HTMLVideoElement::paintCurrentFrameInContext(GraphicsContext* context, const IntRect& destRect)
+void HTMLVideoElement::paintCurrentFrameInContext(GraphicsContext* context, const IntRect& destRect) const
 {
     MediaPlayer* player = HTMLMediaElement::player();
     if (!player)
         return;
     player->paint(context, destRect);
 }
 
 bool HTMLVideoElement::copyVideoTextureToPlatformTexture(blink::WebGraphicsContext3D* context, Platform3DObject texture, GLint level, GLenum type, GLenum internalFormat, bool premultiplyAlpha, bool flipY)
 {
     if (!player())
@@ skipping 38 matching lines @@
     if (url.isEmpty())
         return KURL();
     return document().completeURL(url);
 }
 
 KURL HTMLVideoElement::mediaPlayerPosterURL()
 {
     return posterImageURL();
 }
 
+PassRefPtr<Image> HTMLVideoElement::getSourceImageForCanvas(HTMLCanvasElement* canvas, ExceptionState& exceptionState, CanvasImageSourceUsage usage, bool* isVolatile) const
+{
+    ASSERT(usage != DrawCanvasImageSourceUsage); // Drawing should use paintCurrentFrameInContext
+    if (isVolatile)
+        *isVolatile = false;
+    if (!hasAvailableVideoFrame())
+        return nullptr;
+
+    IntSize intrinsicSize(videoWidth(), videoHeight());
+    OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(intrinsicSize);
+    if (!imageBuffer)
+        return nullptr;
+
+    paintCurrentFrameInContext(imageBuffer->context(), IntRect(IntPoint(0, 0), intrinsicSize));
+
+    return imageBuffer->copyImage(imageBuffer->fastCopyImageMode(), Unscaled);
 }
+
+bool HTMLVideoElement::wouldTaintOrigin(CanvasRenderingContext* destinationContext) const
+{
+    return !hasSingleSecurityOrigin() || (!(player() && player()->didPassCORSAccessCheck()) && destinationContext->wouldTaintOrigin(currentSrc()));
+}
+
+FloatSize HTMLVideoElement::sourceSize() const
+{
+    return FloatSize(videoWidth(), videoHeight());
+}
+
+}