Implement image-rendering:pixelated for accelerated 2D canvases.

Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 69 matching lines @@
     : HTMLElement(canvasTag, document)
     , DocumentVisibilityObserver(document)
     , m_size(DefaultWidth, DefaultHeight)
     , m_ignoreReset(false)
     , m_accelerationDisabled(false)
     , m_externallyAllocatedMemory(0)
     , m_originClean(true)
     , m_didFailToCreateImageBuffer(false)
     , m_didClearImageBuffer(false)
 {
+    setHasCustomStyleCallbacks();
 }
 
 DEFINE_NODE_FACTORY(HTMLCanvasElement)
 
 HTMLCanvasElement::~HTMLCanvasElement()
 {
     resetDirtyRect();
     v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(-m_externallyAllocatedMemory);
 #if !ENABLE(OILPAN)
     HashSet<RawPtr<CanvasObserver> >::iterator end = m_observers.end();
@@ skipping 13 matching lines @@
 }
 
 RenderObject* HTMLCanvasElement::createRenderer(RenderStyle* style)
 {
     LocalFrame* frame = document().frame();
     if (frame && frame->script().canExecuteScripts(NotAboutToExecuteScript))
         return new RenderHTMLCanvas(this);
     return HTMLElement::createRenderer(style);
 }
 
+void HTMLCanvasElement::didRecalcStyle(StyleRecalcChange)
+{
+    //printf("HTMLCanvasElement::didRecalcStyle\n");
+    if (!hasImageBuffer())
+        return;
+    //printf("HTMLCanvasElement::didRecalcStyle hasImageBuffer\n");
+    m_imageBuffer->setFilterLevel(computedStyle()->imageRendering() == ImageRenderingPixelated ? SkPaint::kNone_FilterLevel : SkPaint::kLow_FilterLevel);
+}
+
 Node::InsertionNotificationRequest HTMLCanvasElement::insertedInto(ContainerNode* node)
 {
     setIsInCanvasSubtree(true);
     return HTMLElement::insertedInto(node);
 }
 
 void HTMLCanvasElement::addObserver(CanvasObserver* observer)
 {
     m_observers.add(observer);
 }
@@ skipping 394 matching lines @@
         // pixel readback, but that is unavoidable in this case.
         // FIXME: Actually, avoid setting m_accelerationDisabled at all when
         // doing GPU-based rasterization.
         if (m_accelerationDisabled)
             return adoptPtr(new UnacceleratedImageBufferSurface(deviceSize, opacityMode));
         return adoptPtr(new WebGLImageBufferSurface(deviceSize, opacityMode));
     }
 
     OwnPtr<RecordingImageBufferFallbackSurfaceFactory> surfaceFactory = createSurfaceFactory(deviceSize, msaaSampleCount);
 
-    if (RuntimeEnabledFeatures::displayList2dCanvasEnabled()) {
+    if (RuntimeEnabledFeatures::displayList2dCanvasEnabled() && false) {
         OwnPtr<ImageBufferSurface> surface = adoptPtr(new RecordingImageBufferSurface(deviceSize, surfaceFactory.release(), opacityMode));
         if (surface->isValid())
             return surface.release();
         surfaceFactory = createSurfaceFactory(deviceSize, msaaSampleCount); // recreate because old previous one was released
     }
 
     return surfaceFactory->createSurface(deviceSize, opacityMode);
 }
 
 void HTMLCanvasElement::createImageBuffer()
@@ skipping 22 matching lines @@
         return;
 
     int msaaSampleCount;
     OwnPtr<ImageBufferSurface> surface = createImageBufferSurface(deviceSize, &msaaSampleCount);
     if (!surface->isValid())
         return;
 
     m_imageBuffer = ImageBuffer::create(surface.release());
     m_imageBuffer->setClient(this);
 
+    m_imageBuffer->setFilterLevel(computedStyle()->imageRendering() == ImageRenderingPixelated ? SkPaint::kNone_FilterLevel : SkPaint::kLow_FilterLevel);
+
     m_didFailToCreateImageBuffer = false;
 
     updateExternallyAllocatedMemory();
 
     if (is3D()) {
         // Early out for WebGL canvases
         return;
     }
 
     m_imageBuffer->setClient(this);
@@ skipping 204 matching lines @@
 {
     return !originClean();
 }
 
 FloatSize HTMLCanvasElement::sourceSize() const
 {
     return FloatSize(width(), height());
 }
 
 }