Adds filter support for offscreen canvas

third_party/WebKit/Source/core/style/SVGComputedStyle.cpp

 /*
     Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
                   2004, 2005, 2010 Rob Buis <buis@kde.org>
     Copyright (C) Research In Motion Limited 2010. All rights reserved.
 
     Based on khtml code by:
     Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
     Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
     Copyright (C) 2002-2003 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Apple Computer, Inc.
@@ skipping 15 matching lines @@
 */
 
 #include "core/style/SVGComputedStyle.h"
 
 namespace blink {
 
 static const int kPaintOrderBitwidth = 2;
 
 SVGComputedStyle::SVGComputedStyle()
 {
-    static SVGComputedStyle* initialStyle = new SVGComputedStyle(CreateInitial);
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<SVGComputedStyle*>, style,

[esprehn, 2016/09/12 20:53:12]

ditto

+        new ThreadSpecific<SVGComputedStyle*>);
+    if (!*style) {
+        *style = new SVGComputedStyle(CreateInitial);
+    }
+
+    SVGComputedStyle* initialStyle = *style;
 
     fill = initialStyle->fill;
     stroke = initialStyle->stroke;
     stops = initialStyle->stops;
     misc = initialStyle->misc;
     inheritedResources = initialStyle->inheritedResources;
     geometry = initialStyle->geometry;
     resources = initialStyle->resources;
 
     setBitDefaults();
@@ skipping 70 matching lines @@
 {
     svg_noninherited_flags = other->svg_noninherited_flags;
     stops = other->stops;
     misc = other->misc;
     geometry = other->geometry;
     resources = other->resources;
 }
 
 PassRefPtr<SVGDashArray> SVGComputedStyle::initialStrokeDashArray()
 {
-    DEFINE_STATIC_REF(SVGDashArray, initialDashArray, SVGDashArray::create());
-    return initialDashArray;
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<SVGDashArray*>, initialDashArray,
+        new ThreadSpecific<SVGDashArray*>());
+    if (!*initialDashArray) {
+        *initialDashArray = SVGDashArray::create().leakRef();
+    }
+    return *initialDashArray;
 }
 
 StyleDifference SVGComputedStyle::diff(const SVGComputedStyle* other) const
 {
     StyleDifference styleDifference;
 
     if (diffNeedsLayoutAndPaintInvalidation(other)) {
         styleDifference.setNeedsFullLayout();
         styleDifference.setNeedsPaintInvalidationObject();
     } else if (diffNeedsPaintInvalidation(other)) {
@@ skipping 129 matching lines @@
     case PaintOrderMarkersStrokeFill:
         pt = paintOrderSequence(PT_MARKERS, PT_STROKE, PT_FILL);
         break;
     }
 
     pt = (pt >> (kPaintOrderBitwidth*index)) & ((1u << kPaintOrderBitwidth) - 1);
     return (EPaintOrderType)pt;
 }
 
 } // namespace blink