Add ImageBitmapRenderingContext (experimental)

third_party/WebKit/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 317 matching lines @@
 
 void HTMLCanvasElement::restoreCanvasMatrixClipStack(SkCanvas* canvas) const
 {
     if (m_context)
         m_context->restoreCanvasMatrixClipStack(canvas);
 }
 
 void HTMLCanvasElement::doDeferredPaintInvalidation()
 {
     ASSERT(!m_dirtyRect.isEmpty());
-    if (is3D()) {
+    if (!m_context->is2d()) {
         didFinalizeFrame();
     } else {
         ASSERT(hasImageBuffer());
         FloatRect srcRect(0, 0, size().width(), size().height());
         m_dirtyRect.intersect(srcRect);
         LayoutBox* lb = layoutBox();
         if (lb) {
             FloatRect mappedDirtyRect = mapRect(m_dirtyRect, srcRect, FloatRect(lb->contentBoxRect()));
             if (m_context->isAccelerated()) {
                 // Accelerated 2D canvases need the dirty rect to be expressed relative to the
@@ skipping 105 matching lines @@
 }
 
 void HTMLCanvasElement::paint(GraphicsContext& context, const LayoutRect& r)
 {
     // FIXME: crbug.com/438240; there is a bug with the new CSS blending and compositing feature.
     if (!m_context)
         return;
     if (!paintsIntoCanvasBuffer() && !document().printing())
         return;
 
+    // TODO(junov): Paint is currently only implemented by ImageBitmap contexts,

[Stephen White, 2016/02/10 15:34:55]

MicroNit: comma splice. Use a semicolon, or split into two sentences.

+    // we could improve the abstraction by making all context types paint
+    /// themselves (implement paint).

[Stephen White, 2016/02/10 15:34:55]

MicroNit: ///

+    if (m_context->paint(context, pixelSnappedIntRect(r)))
+        return;
+
     m_context->paintRenderingResultsToCanvas(FrontBuffer);
     if (hasImageBuffer()) {
         if (!context.contextDisabled()) {
             SkXfermode::Mode compositeOperator = !m_context || m_context->hasAlpha() ? SkXfermode::kSrcOver_Mode : SkXfermode::kSrc_Mode;
             buffer()->draw(context, pixelSnappedIntRect(r), 0, compositeOperator);
         }
     } else {
         // When alpha is false, we should draw to opaque black.
         if (!m_context->hasAlpha())
             context.fillRect(FloatRect(r), Color(0, 0, 0));
@@ skipping 551 matching lines @@
     }
     return ImageBitmapSource::fulfillImageBitmap(scriptState, isPaintable() ? ImageBitmap::create(this, IntRect(sx, sy, sw, sh), options) : nullptr);
 }
 
 bool HTMLCanvasElement::isOpaque() const
 {
     return m_context && !m_context->hasAlpha();
 }
 
 } // namespace blink