Plumb in flag to enable antialiased clipping in HTML 5 Canvas

Source/core/html/canvas/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 28 matching lines @@
 #include "core/CSSPropertyNames.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/StyleEngine.h"
 #include "core/events/Event.h"
 #include "core/fetch/ImageResource.h"
 #include "core/frame/ImageBitmap.h"
+#include "core/frame/Settings.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/ImageData.h"
 #include "core/html/TextMetrics.h"
 #include "core/html/canvas/CanvasGradient.h"
 #include "core/html/canvas/CanvasPattern.h"
 #include "core/html/canvas/CanvasStyle.h"
 #include "core/html/canvas/Path2D.h"
@@ skipping 21 matching lines @@
 static const char ltr[] = "ltr";
 static const double TryRestoreContextInterval = 0.5;
 static const unsigned MaxTryRestoreContextAttempts = 4;
 static const unsigned FetchedFontsCacheLimit = 50;
 
 static bool contextLostRestoredEventsEnabled()
 {
     return RuntimeEnabledFeatures::experimentalCanvasFeaturesEnabled();
 }
 
-CanvasRenderingContext2D::CanvasRenderingContext2D(HTMLCanvasElement* canvas, const Canvas2DContextAttributes* attrs, bool usesCSSCompatibilityParseMode)
+CanvasRenderingContext2D::CanvasRenderingContext2D(HTMLCanvasElement* canvas, const Canvas2DContextAttributes* attrs, Document& document)
     : CanvasRenderingContext(canvas)
-    , m_usesCSSCompatibilityParseMode(usesCSSCompatibilityParseMode)
+    , m_usesCSSCompatibilityParseMode(document.inQuirksMode())
+    , m_clipAntialiasing(GraphicsContext::NotAntiAliased)
     , m_hasAlpha(!attrs || attrs->alpha())
     , m_isContextLost(false)
     , m_contextRestorable(true)
     , m_storageMode(!attrs ? PersistentStorage : attrs->parsedStorage())
     , m_tryRestoreContextAttemptCount(0)
     , m_dispatchContextLostEventTimer(this, &CanvasRenderingContext2D::dispatchContextLostEvent)
     , m_dispatchContextRestoredEventTimer(this, &CanvasRenderingContext2D::dispatchContextRestoredEvent)
     , m_tryRestoreContextEventTimer(this, &CanvasRenderingContext2D::tryRestoreContextEvent)
 {
+    if (document.settings() && document.settings()->antialiasedClips2dCanvasEnabled())
+        m_clipAntialiasing = GraphicsContext::AntiAliased;
     m_stateStack.append(adoptPtrWillBeNoop(new State()));
 }
 
 void CanvasRenderingContext2D::unwindStateStack()
 {
     if (size_t stackSize = m_stateStack.size()) {
         if (GraphicsContext* context = canvas()->existingDrawingContext()) {
             while (--stackSize)
                 context->restore();
         }
@@ skipping 994 matching lines @@
 {
     GraphicsContext* c = drawingContext();
     if (!c) {
         return;
     }
     if (!state().m_invertibleCTM) {
         return;
     }
 
     realizeSaves(c);
-    c->canvasClip(path, parseWinding(windingRuleString));
+    c->canvasClip(path, parseWinding(windingRuleString), m_clipAntialiasing);
     modifiableState().m_hasClip = true;
 }
 
 void CanvasRenderingContext2D::clip(const String& windingRuleString)
 {
     clipInternal(m_path, windingRuleString);
 }
 
 void CanvasRenderingContext2D::clip(Path2D* domPath, const String& windingRuleString)
 {
@@ skipping 1336 matching lines @@
 
 unsigned CanvasRenderingContext2D::hitRegionsCount() const
 {
     if (m_hitRegionManager)
         return m_hitRegionManager->getHitRegionsCount();
 
     return 0;
 }
 
 } // namespace blink