Add an heuristic for promoting canvases to GPU acceleration

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
@@ skipping 72 matching lines @@
 // Drawing methods need to use this instead of SkAutoCanvasRestore in case
 // overdraw detection substitutes the recording canvas (to discard overdrawn
 // draw calls).
 class CanvasRenderingContext2DAutoRestoreSkCanvas {
   STACK_ALLOCATED();
 
  public:
   explicit CanvasRenderingContext2DAutoRestoreSkCanvas(
       CanvasRenderingContext2D* context)
       : m_context(context), m_saveCount(0) {
-    ASSERT(m_context);
+    DCHECK(m_context);
     SkCanvas* c = m_context->drawingCanvas();
     if (c) {
       m_saveCount = c->getSaveCount();
     }
   }
 
   ~CanvasRenderingContext2DAutoRestoreSkCanvas() {
     SkCanvas* c = m_context->drawingCanvas();
     if (c)
       c->restoreToCount(m_saveCount);
@@ skipping 84 matching lines @@
     canvas()->discardImageBuffer();
   }
   m_dispatchContextLostEventTimer.startOneShot(0, BLINK_FROM_HERE);
 }
 
 void CanvasRenderingContext2D::didSetSurfaceSize() {
   if (!m_contextRestorable)
     return;
   // This code path is for restoring from an eviction
   // Restoring from surface failure is handled internally
-  ASSERT(m_contextLostMode != NotLostContext && !canvas()->hasImageBuffer());
+  DCHECK(m_contextLostMode != NotLostContext && !canvas()->hasImageBuffer());
 
   if (canvas()->buffer()) {
     if (contextLostRestoredEventsEnabled()) {
       m_dispatchContextRestoredEventTimer.startOneShot(0, BLINK_FROM_HERE);
     } else {
       // legacy synchronous context restoration.
       reset();
       m_contextLostMode = NotLostContext;
     }
   }
@@ skipping 52 matching lines @@
   if (m_contextLostMode == NotLostContext)
     return;
   reset();
   m_contextLostMode = NotLostContext;
   if (contextLostRestoredEventsEnabled()) {
     Event* event(Event::create(EventTypeNames::contextrestored));
     canvas()->dispatchEvent(event);
   }
 }
 
+void CanvasRenderingContext2D::willDrawImage(CanvasImageSource* source) const {
+  canvas()->willDrawImageTo2DContext(source);
+}
+
 ColorBehavior CanvasRenderingContext2D::drawImageColorBehavior() const {
   return CanvasRenderingContext::colorBehaviorForMediaDrawnToCanvas();
 }
 
 void CanvasRenderingContext2D::reset() {
   // This is a multiple inherritance bootstrap
   BaseRenderingContext2D::reset();
 }
 
 void CanvasRenderingContext2D::restoreCanvasMatrixClipStack(SkCanvas* c) const {
@@ skipping 164 matching lines @@
   CanvasFontCache* canvasFontCache = canvas()->document().canvasFontCache();
 
   // Map the <canvas> font into the text style. If the font uses keywords like
   // larger/smaller, these will work relative to the canvas.
   RefPtr<ComputedStyle> fontStyle;
   const ComputedStyle* computedStyle = canvas()->ensureComputedStyle();
   if (computedStyle) {
     HashMap<String, Font>::iterator i =
         m_fontsResolvedUsingCurrentStyle.find(newFont);
     if (i != m_fontsResolvedUsingCurrentStyle.end()) {
-      ASSERT(m_fontLRUList.contains(newFont));
+      DCHECK(m_fontLRUList.contains(newFont));
       m_fontLRUList.remove(newFont);
       m_fontLRUList.add(newFont);
       modifiableState().setFont(
           i->value, canvas()->document().styleEngine().fontSelector());
     } else {
       MutableStylePropertySet* parsedStyle =
           canvasFontCache->parseFont(newFont);
       if (!parsedStyle)
         return;
       fontStyle = ComputedStyle::create();
       FontDescription elementFontDescription(
           computedStyle->getFontDescription());
       // Reset the computed size to avoid inheriting the zoom factor from the
       // <canvas> element.
       elementFontDescription.setComputedSize(
           elementFontDescription.specifiedSize());
       fontStyle->setFontDescription(elementFontDescription);
       fontStyle->font().update(fontStyle->font().getFontSelector());
       canvas()->document().ensureStyleResolver().computeFont(fontStyle.get(),
                                                              *parsedStyle);
       m_fontsResolvedUsingCurrentStyle.add(newFont, fontStyle->font());
-      ASSERT(!m_fontLRUList.contains(newFont));
+      DCHECK(!m_fontLRUList.contains(newFont));
       m_fontLRUList.add(newFont);
       pruneLocalFontCache(canvasFontCache->hardMaxFonts());  // hard limit
       schedulePruneLocalFontCacheIfNeeded();                 // soft limit
       modifiableState().setFont(
           fontStyle->font(), canvas()->document().styleEngine().fontSelector());
     }
   } else {
     Font resolvedFont;
     if (!canvasFontCache->getFontUsingDefaultStyle(newFont, resolvedFont))
       return;
@@ skipping 187 matching lines @@
   if (computedStyle)
     *computedStyle = style;
   switch (direction) {
     case CanvasRenderingContext2DState::DirectionInherit:
       return style ? style->direction() : TextDirection::kLtr;
     case CanvasRenderingContext2DState::DirectionRTL:
       return TextDirection::kRtl;
     case CanvasRenderingContext2DState::DirectionLTR:
       return TextDirection::kLtr;
   }
-  ASSERT_NOT_REACHED();
+  NOTREACHED();
   return TextDirection::kLtr;
 }
 
 String CanvasRenderingContext2D::direction() const {
   if (state().getDirection() == CanvasRenderingContext2DState::DirectionInherit)
     canvas()->document().updateStyleAndLayoutTreeForNode(canvas());
   return toTextDirection(state().getDirection(), canvas()) ==
                  TextDirection::kRtl
              ? rtlDirectionString
              : ltrDirectionString;
@@ skipping 126 matching lines @@
 
   if (!std::isfinite(x) || !std::isfinite(y))
     return;
   if (maxWidth && (!std::isfinite(*maxWidth) || *maxWidth <= 0))
     return;
 
   // Currently, SkPictureImageFilter does not support subpixel text
   // 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() && !isAccelerated()) {
     canvas()->disableDeferral(
         DisableDeferralReasonSubPixelTextAntiAliasingSupport);
+  }
 
   const Font& font = accessFont();
   font.getFontDescription().setSubpixelAscentDescent(true);
   const SimpleFontData* fontData = font.primaryFont();
   DCHECK(fontData);
   if (!fontData)
     return;
   const FontMetrics& fontMetrics = fontData->getFontMetrics();
 
   // FIXME: Need to turn off font smoothing.
@@ skipping 151 matching lines @@
     scrollPathIntoViewInternal(path);
     drawFocusRing(path);
   }
 
   // Update its accessible bounds whether it's focused or not.
   updateElementAccessibility(path, element);
 }
 
 bool CanvasRenderingContext2D::focusRingCallIsValid(const Path& path,
                                                     Element* element) {
-  ASSERT(element);
+  DCHECK(element);
   if (!state().isTransformInvertible())
     return false;
   if (path.isEmpty())
     return false;
   if (!element->isDescendantOf(canvas()))
     return false;
 
   return true;
 }
 
@@ skipping 66 matching lines @@
       !c->getClipDeviceBounds(0)) {
     exceptionState.throwDOMException(NotSupportedError,
                                      "The specified path has no pixels.");
     return;
   }
 
   hitRegionPath.transform(state().transform());
 
   if (state().hasClip()) {
     hitRegionPath.intersectPath(state().getCurrentClipPath());
-    if (hitRegionPath.isEmpty())
+    if (hitRegionPath.isEmpty()) {
       exceptionState.throwDOMException(NotSupportedError,
                                        "The specified path has no pixels.");
+    }
   }
 
   if (!m_hitRegionManager)
     m_hitRegionManager = HitRegionManager::create();
 
   // Remove previous region (with id or control)
   m_hitRegionManager->removeHitRegionById(options.id());
   m_hitRegionManager->removeHitRegionByControl(options.control());
 
   HitRegion* hitRegion = HitRegion::create(hitRegionPath, options);
@@ skipping 53 matching lines @@
   }
   return true;
 }
 
 void CanvasRenderingContext2D::resetUsageTracking() {
   UsageCounters newCounters;
   m_usageCounters = newCounters;
 }
 
 }  // namespace blink