Revert of Tracking filter mutation via SVGElementProxy

third_party/WebKit/Source/core/svg/SVGResourceClient.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 "core/svg/SVGResourceClient.h"
+
+#include "core/fetch/DocumentResourceReference.h"
+#include "core/layout/svg/LayoutSVGResourceContainer.h"
+#include "core/layout/svg/ReferenceFilterBuilder.h"
+#include "core/svg/SVGFilterElement.h"
+
+namespace blink {
+
+SVGResourceClient::SVGResourceClient() {
+  ThreadState::current()->registerPreFinalizer(this);
+}
+
+SVGResourceClient::~SVGResourceClient() {}
+
+void SVGResourceClient::addFilterReferences(const FilterOperations& operations,
+                                            const Document& document) {
+  for (size_t i = 0; i < operations.size(); ++i) {
+    FilterOperation* filterOperation = operations.operations().at(i);
+    if (filterOperation->type() != FilterOperation::REFERENCE)
+      continue;
+    ReferenceFilterOperation* referenceFilterOperation =
+        toReferenceFilterOperation(filterOperation);
+    DocumentResourceReference* documentReference =
+        ReferenceFilterBuilder::documentResourceReference(
+            referenceFilterOperation);
+    DocumentResource* cachedSVGDocument =
+        documentReference ? documentReference->document() : 0;
+
+    if (cachedSVGDocument) {
+      cachedSVGDocument->addClient(this);
+      m_externalFilterReferences.append(cachedSVGDocument);
+    } else {
+      Element* element =
+          document.getElementById(referenceFilterOperation->fragment());
+      if (!isSVGFilterElement(element))
+        continue;
+      SVGFilterElement* filter = toSVGFilterElement(element);
+      if (filter->layoutObject())
+        toLayoutSVGResourceContainer(filter->layoutObject())
+            ->addResourceClient(this);
+      else
+        filter->addClient(this);
+      m_internalFilterReferences.add(filter);
+    }
+  }
+}
+
+void SVGResourceClient::clearFilterReferences() {
+  for (SVGFilterElement* filter : m_internalFilterReferences) {
+    if (filter->layoutObject())
+      toLayoutSVGResourceContainer(filter->layoutObject())
+          ->removeResourceClient(this);
+    else
+      filter->removeClient(this);
+  }
+  m_internalFilterReferences.clear();
+
+  for (DocumentResource* documentResource : m_externalFilterReferences)
+    documentResource->removeClient(this);
+  m_externalFilterReferences.clear();
+}
+
+void SVGResourceClient::filterWillBeDestroyed(SVGFilterElement* filter) {
+  m_internalFilterReferences.remove(filter);
+  // TODO(Oilpan): Currently filterNeedsInvalidation() is not called when
+  // the filter is removed from m_internalFilterReferences by weak processing.
+  // It needs to be called.
+  filterNeedsInvalidation();
+}
+
+void SVGResourceClient::notifyFinished(Resource*) {
+  filterNeedsInvalidation();
+}
+
+DEFINE_TRACE(SVGResourceClient) {
+  visitor->trace(m_internalFilterReferences);
+  visitor->trace(m_externalFilterReferences);
+  DocumentResourceClient::trace(visitor);
+}
+
+}  // namespace blink