Drop FilterEffectBuilder::m_referenceFilters

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
@@ skipping 111 matching lines @@
 {
 }
 
 FilterEffectBuilder::~FilterEffectBuilder()
 {
 }
 
 DEFINE_TRACE(FilterEffectBuilder)
 {
     visitor->trace(m_lastEffect);
-    visitor->trace(m_referenceFilters);
 }
 
 bool FilterEffectBuilder::build(Element* element, const FilterOperations& operations, float zoom, const FloatSize* referenceBoxSize, const SkPaint* fillPaint, const SkPaint* strokePaint)
 {
     // Create a parent filter for shorthand filters. These have already been scaled by the CSS code for page zoom, so scale is 1.0 here.
     Filter* parentFilter = Filter::create(1.0f);
     FilterEffect* previousEffect = parentFilter->getSourceGraphic();
     for (size_t i = 0; i < operations.operations().size(); ++i) {
         FilterEffect* effect = nullptr;
         FilterOperation* filterOperation = operations.operations().at(i).get();
         switch (filterOperation->type()) {
         case FilterOperation::REFERENCE: {
             Filter* referenceFilter = ReferenceFilterBuilder::build(zoom, element, previousEffect, toReferenceFilterOperation(*filterOperation), referenceBoxSize, fillPaint, strokePaint);
-            if (referenceFilter) {
+            if (referenceFilter)
                 effect = referenceFilter->lastEffect();
-                m_referenceFilters.append(referenceFilter);
-            }
             break;
         }
         case FilterOperation::GRAYSCALE: {
             Vector<float> inputParameters = grayscaleMatrix(toBasicColorMatrixFilterOperation(filterOperation)->amount());
             effect = FEColorMatrix::create(parentFilter, FECOLORMATRIX_TYPE_MATRIX, inputParameters);
             break;
         }
         case FilterOperation::SEPIA: {
             Vector<float> inputParameters = sepiaMatrix(toBasicColorMatrixFilterOperation(filterOperation)->amount());
             effect = FEColorMatrix::create(parentFilter, FECOLORMATRIX_TYPE_MATRIX, inputParameters);
@@ skipping 85 matching lines @@
                 effect->setClipsToBounds(false);
                 effect->setOperatingColorSpace(ColorSpaceDeviceRGB);
                 effect->inputEffects().append(previousEffect);
             }
             if (previousEffect->originTainted())
                 effect->setOriginTainted();
             previousEffect = effect;
         }
     }
 
-    m_referenceFilters.append(parentFilter);
-
     // We need to keep the old effects alive until this point, so that SVG reference filters
     // can share cached resources across frames.
     m_lastEffect = previousEffect;
 
     // If we didn't make any effects, tell our caller we are not valid
     if (!m_lastEffect.get())
         return false;
 
     return true;
 }
 
 } // namespace blink