Streamline the presentation of ImageBitmapRenderingContext

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp

Index: third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
index 0933dbf8ac4cb840bdc42fa13b90ef8a1332ccda..1c7e7ead8ee0beedbace1780c41a210cf612f817 100644
--- a/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp
@@ -172,6 +172,10 @@ bool CanvasRenderingContext2D::isAccelerated() const {
   return canvas()->buffer()->isAccelerated();
 }
 
+bool CanvasRenderingContext2D::isComposited() const {
+  return isAccelerated();

[xlai (Olivia), 2017/03/09 21:57:27]

Your CL is about decoupling canvas being composited and being accelerated. Why
are they equivalent in here then?

[Justin Novosad, 2017/03/10 21:09:59]

For 2D canvas and WebGL, they are equivalent, but at the higher abstraction
level (CanvasRenderingContext), they are not.  The is because of the change to
ImageBitmapRenderingContext.

+}
+
 void CanvasRenderingContext2D::stop() {
   if (!isContextLost()) {
     // Never attempt to restore the context because the page is being torn down.
@@ -825,7 +829,7 @@ void CanvasRenderingContext2D::drawTextInternal(
   // anti-aliasing, which is expected when !creationAttributes().alpha(), so we
   // need to fall out of display list mode when drawing text to an opaque
   // canvas. crbug.com/583809
-  if (!creationAttributes().alpha() && !isAccelerated()) {
+  if (!creationAttributes().alpha() && !isComposited()) {
     canvas()->disableDeferral(
         DisableDeferralReasonSubPixelTextAntiAliasingSupport);
   }