Tracking filter mutation via SVGElementProxy

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

 /*
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 #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),
+      m_elementProxyGeneration(elementProxy.generation()) {}
+
+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 &&
+         m_elementProxyGeneration == other.m_elementProxyGeneration;

[esprehn, 2016/10/25 01:18:42]

What changes the generation?

[fs, 2016/10/25 15:00:53]

All invalidations of the proxy (SVGElementProxy::proxiedElementChanged).

+}
+
 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