Reland of "Tracking reference filter mutation via SVGElementProxy"

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

 /*
  * Copyright (C) 2011 Apple 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 COMPUTER, 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/style/FilterOperation.h"
 
+#include "core/svg/SVGElementProxy.h"
 #include "platform/LengthFunctions.h"
 #include "platform/animation/AnimationUtilities.h"
 #include "platform/graphics/filters/FEDropShadow.h"
 #include "platform/graphics/filters/FEGaussianBlur.h"
 #include "platform/graphics/filters/Filter.h"
 #include "platform/graphics/filters/FilterEffect.h"
 
 namespace blink {
 
 FilterOperation* FilterOperation::blend(const FilterOperation* from,
                                         const FilterOperation* to,
                                         double progress) {
   DCHECK(from || to);
   if (to)
     return to->blend(from, progress);
   return from->blend(0, 1 - progress);
 }
 
 DEFINE_TRACE(ReferenceFilterOperation) {
+  visitor->trace(m_elementProxy);
   visitor->trace(m_filter);
   FilterOperation::trace(visitor);
 }
 
 FloatRect ReferenceFilterOperation::mapRect(const FloatRect& rect) const {
   const auto* lastEffect = m_filter ? m_filter->lastEffect() : nullptr;
   if (!lastEffect)
     return rect;
   return lastEffect->mapRect(rect);
 }
 
+ReferenceFilterOperation::ReferenceFilterOperation(
+    const String& url,
+    SVGElementProxy& elementProxy)
+    : FilterOperation(REFERENCE), m_url(url), m_elementProxy(&elementProxy) {}
+
+void ReferenceFilterOperation::addClient(SVGResourceClient* client) {
+  m_elementProxy->addClient(client);
+}
+
+void ReferenceFilterOperation::removeClient(SVGResourceClient* client) {
+  m_elementProxy->removeClient(client);
+}
+
+bool ReferenceFilterOperation::operator==(const FilterOperation& o) const {
+  if (!isSameType(o))
+    return false;
+  const ReferenceFilterOperation& other = toReferenceFilterOperation(o);
+  return m_url == other.m_url && m_elementProxy == other.m_elementProxy;
+}
+
 FilterOperation* BasicColorMatrixFilterOperation::blend(
     const FilterOperation* from,
     double progress) const {
   double fromAmount;
   if (from) {
     SECURITY_DCHECK(from->isSameType(*this));
     fromAmount = toBasicColorMatrixFilterOperation(from)->amount();
   } else {
     switch (m_type) {
       case GRAYSCALE:
@@ skipping 116 matching lines @@
 }
 
 bool BoxReflectFilterOperation::operator==(const FilterOperation& o) const {
   if (!isSameType(o))
     return false;
   const auto& other = static_cast<const BoxReflectFilterOperation&>(o);
   return m_reflection == other.m_reflection;
 }
 
 }  // namespace blink