Adds filter support for offscreen canvas

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp

 // Copyright 2016 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/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h"
 
 #include "bindings/modules/v8/OffscreenCanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
 #include "core/workers/WorkerGlobalScope.h"
@@ skipping 158 matching lines @@
     if (!m_imageBuffer)
         return AffineTransform(); // identity
     return m_imageBuffer->baseTransform();
 }
 
 void OffscreenCanvasRenderingContext2D::didDraw(const SkIRect& dirtyRect)
 { }
 
 bool OffscreenCanvasRenderingContext2D::stateHasFilter()
 {
-    // TODO: crbug.com/593838 make hasFilter accept nullptr
-    // return state().hasFilter(nullptr, nullptr, IntSize(width(), height()), this);
-    return false;
+    return state().hasFilter(nullptr, getOffscreenCanvas()->size(), nullptr);
 }
 
 SkImageFilter* OffscreenCanvasRenderingContext2D::stateGetFilter()
 {
-    // TODO: make getFilter accept nullptr
-    // return state().getFilter(nullptr, nullptr, IntSize(width(), height()), this);
-    return nullptr;
+    SkImageFilter* f = state().getFilter(nullptr, getOffscreenCanvas()->size(), nullptr);
+    return f;
+}
+
+void OffscreenCanvasRenderingContext2D::setFilter(const String& filterString)
+{
+    BaseRenderingContext2D::setFilter(filterString);
 }
 
 void OffscreenCanvasRenderingContext2D::validateStateStack()
 {
 #if ENABLE(ASSERT)
     SkCanvas* skCanvas = existingDrawingCanvas();
     if (skCanvas) {
         ASSERT(static_cast<size_t>(skCanvas->getSaveCount()) == m_stateStack.size());
     }
 #endif
 }
 
 bool OffscreenCanvasRenderingContext2D::isContextLost() const
 {
     return false;
 }
 
 bool OffscreenCanvasRenderingContext2D::isPaintable() const
 {
     return this->imageBuffer();
 }
 }