Make OffscreenCanvasRenderingContext2D renderable on a worker

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/canvas2d/CanvasRenderingContext2DState.h"
 
 #include "core/css/CSSFontSelector.h"
 #include "core/css/resolver/FilterOperationResolver.h"
 #include "core/css/resolver/StyleBuilder.h"
 #include "core/css/resolver/StyleResolverState.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/paint/FilterEffectBuilder.h"
 #include "core/style/ComputedStyle.h"
 #include "core/svg/SVGFilterElement.h"
+#include "modules/canvas2d/BaseRenderingContext2D.h"
 #include "modules/canvas2d/CanvasGradient.h"
 #include "modules/canvas2d/CanvasPattern.h"
-#include "modules/canvas2d/CanvasRenderingContext2D.h"
 #include "modules/canvas2d/CanvasStyle.h"
 #include "platform/graphics/DrawLooperBuilder.h"
-#include "platform/graphics/filters/FilterOperation.h"
 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
 #include "platform/graphics/skia/SkiaUtils.h"
 #include "third_party/skia/include/effects/SkDashPathEffect.h"
 #include "third_party/skia/include/effects/SkDropShadowImageFilter.h"
 
 static const char defaultFont[] = "10px sans-serif";
 static const char defaultFilter[] = "none";
 
 namespace blink {
 
@@ skipping 255 matching lines @@
     m_isTransformInvertible = transform.isInvertible();
     m_transform = transform;
 }
 
 void CanvasRenderingContext2DState::resetTransform()
 {
     m_transform.makeIdentity();
     m_isTransformInvertible = true;
 }
 
-static void updateFilterReferences(HTMLCanvasElement* canvasElement, CanvasRenderingContext2D* context, const FilterOperations& filters)
-{
-    context->clearFilterReferences();
-    context->addFilterReferences(filters, canvasElement->document());
-}
-
-SkImageFilter* CanvasRenderingContext2DState::getFilter(Element* styleResolutionHost, const Font& font, IntSize canvasSize, CanvasRenderingContext2D* context) const
+SkImageFilter* CanvasRenderingContext2DState::getFilter(Element* styleResolutionHost, const Font* font, IntSize canvasSize, BaseRenderingContext2D* context) const
 {
     if (!m_filterValue)
         return nullptr;
 
     if (!m_resolvedFilter) {
         RefPtr<ComputedStyle> filterStyle = ComputedStyle::create();
         // Must set font in case the filter uses any font-relative units (em, ex)
-        filterStyle->setFont(font);
+        if (font)
+            filterStyle->setFont(*font);
 
-        StyleResolverState resolverState(styleResolutionHost->document(), styleResolutionHost, filterStyle.get());
-        resolverState.setStyle(filterStyle);
+        if (styleResolutionHost) {
+            StyleResolverState resolverState(styleResolutionHost->document(), styleResolutionHost, filterStyle.get());
+            resolverState.setStyle(filterStyle);
+            StyleBuilder::applyProperty(CSSPropertyWebkitFilter, resolverState, m_filterValue.get());
+            resolverState.loadPendingResources();
+        }
 
-        StyleBuilder::applyProperty(CSSPropertyWebkitFilter, resolverState, m_filterValue.get());
-        resolverState.loadPendingResources();
         RefPtrWillBeRawPtr<FilterEffectBuilder> filterEffectBuilder = FilterEffectBuilder::create();
 
         // We can't reuse m_fillPaint and m_strokePaint for the filter, since these incorporate
         // the global alpha, which isn't applicable here.
         SkPaint fillPaintForFilter;
         SkPaint strokePaintForFilter;
         m_fillStyle->applyToPaint(fillPaintForFilter);
         m_strokeStyle->applyToPaint(strokePaintForFilter);
         fillPaintForFilter.setColor(m_fillStyle->paintColor());
         strokePaintForFilter.setColor(m_strokeStyle->paintColor());
         FloatSize floatCanvasSize(canvasSize);
         const double effectiveZoom = 1.0; // Deliberately ignore zoom on the canvas element
         filterEffectBuilder->build(styleResolutionHost, filterStyle->filter(), effectiveZoom, &floatCanvasSize, &fillPaintForFilter, &strokePaintForFilter);
 
         SkiaImageFilterBuilder imageFilterBuilder;
         RefPtrWillBeRawPtr<FilterEffect> lastEffect = filterEffectBuilder->lastEffect();
         m_resolvedFilter = imageFilterBuilder.build(lastEffect.get(), ColorSpaceDeviceRGB);
         if (m_resolvedFilter)
-            updateFilterReferences(toHTMLCanvasElement(styleResolutionHost), context, filterStyle->filter());
+            context->updateFilterReferences(filterStyle->filter());
     }
 
     return m_resolvedFilter.get();
 }
 
-bool CanvasRenderingContext2DState::hasFilter(Element* styleResolutionHost, const Font& font, IntSize canvasSize, CanvasRenderingContext2D* context) const
+bool CanvasRenderingContext2DState::hasFilter(Element* styleResolutionHost, const Font* font, IntSize canvasSize, BaseRenderingContext2D* context) const
 {
     // Checking for a non-null m_filterValue isn't sufficient, since this value
     // might refer to a non-existent filter.
     return !!getFilter(styleResolutionHost, font, canvasSize, context);
 }
 
 void CanvasRenderingContext2DState::clearResolvedFilter() const
 {
     m_resolvedFilter.clear();
 }
@@ skipping 211 matching lines @@
         paint->setLooper(0);
         paint->setImageFilter(shadowAndForegroundImageFilter());
         return paint;
     }
     paint->setLooper(shadowAndForegroundDrawLooper());
     paint->setImageFilter(0);
     return paint;
 }
 
 } // namespace blink