Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/paint/FilterEffectBuilder.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/paint/FilterEffectBuilder.h"
 
-#include "core/layout/svg/ReferenceFilterBuilder.h"
 #include "core/style/FilterOperations.h"
+#include "core/svg/SVGElementProxy.h"
 #include "core/svg/SVGFilterElement.h"
 #include "core/svg/SVGLengthContext.h"
 #include "core/svg/graphics/filters/SVGFilterBuilder.h"
 #include "platform/LengthFunctions.h"
 #include "platform/graphics/ColorSpace.h"
 #include "platform/graphics/CompositorFilterOperations.h"
 #include "platform/graphics/filters/FEBoxReflect.h"
 #include "platform/graphics/filters/FEColorMatrix.h"
 #include "platform/graphics/filters/FEComponentTransfer.h"
 #include "platform/graphics/filters/FEDropShadow.h"
@@ skipping 356 matching lines @@
     sk_sp<SkImageFilter> filter = SkiaImageFilterBuilder::transformColorSpace(
         nullptr, currentColorSpace, ColorSpaceDeviceRGB);
     filters.appendReferenceFilter(std::move(filter));
   }
   return filters;
 }
 
 Filter* FilterEffectBuilder::buildReferenceFilter(
     const ReferenceFilterOperation& referenceOperation,
     FilterEffect* previousEffect) const {
-  DCHECK(m_targetContext && m_targetContext->isElementNode());
-  SVGFilterElement* filterElement =
-      ReferenceFilterBuilder::resolveFilterReference(
-          referenceOperation, toElement(*m_targetContext));
-  if (!filterElement)
+  DCHECK(m_targetContext);
+  Element* filterElement = referenceOperation.elementProxy().findElement(
+      m_targetContext->treeScope());
+  if (!isSVGFilterElement(filterElement))
     return nullptr;
-  return buildReferenceFilter(*filterElement, previousEffect);
+  return buildReferenceFilter(toSVGFilterElement(*filterElement),
+                              previousEffect);
 }
 
 Filter* FilterEffectBuilder::buildReferenceFilter(
     SVGFilterElement& filterElement,
     FilterEffect* previousEffect,
     SVGFilterGraphNodeMap* nodeMap) const {
   FloatRect filterRegion = SVGLengthContext::resolveRectangle<SVGFilterElement>(
       &filterElement, filterElement.filterUnits()->currentValue()->enumValue(),
       m_referenceBox);
   // TODO(fs): We rely on the presence of a node map here to opt-in to the
@@ skipping 11 matching lines @@
       Filter::create(m_referenceBox, filterRegion, m_zoom, unitScaling);
   if (!previousEffect)
     previousEffect = result->getSourceGraphic();
   SVGFilterBuilder builder(previousEffect, nodeMap, m_fillPaint, m_strokePaint);
   builder.buildGraph(result, filterElement, m_referenceBox);
   result->setLastEffect(builder.lastEffect());
   return result;
 }
 
 }  // namespace blink