Derive the SourceAlpha filter input from SourceGraphic

Source/core/layout/svg/LayoutSVGResourceFilter.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/layout/svg/LayoutSVGResourceFilter.h"
 
 #include "core/dom/ElementTraversal.h"
 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
 #include "platform/graphics/GraphicsContext.h"
-#include "platform/graphics/filters/SourceAlpha.h"
 #include "platform/graphics/filters/SourceGraphic.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace blink {
 
 DEFINE_TRACE(FilterData)
 {
 #if ENABLE(OILPAN)
     visitor->trace(filter);
     visitor->trace(builder);
@@ skipping 51 matching lines @@
 
     markClientForInvalidation(client, markForInvalidation ? BoundariesInvalidation : ParentOnlyInvalidation);
 }
 
 PassRefPtrWillBeRawPtr<SVGFilterBuilder> LayoutSVGResourceFilter::buildPrimitives(SVGFilter* filter)
 {
     SVGFilterElement* filterElement = toSVGFilterElement(element());
     FloatRect targetBoundingBox = filter->targetBoundingBox();
 
     // Add effects to the builder
-    RefPtrWillBeRawPtr<SVGFilterBuilder> builder = SVGFilterBuilder::create(SourceGraphic::create(filter), SourceAlpha::create(filter));
+    RefPtrWillBeRawPtr<SVGFilterBuilder> builder = SVGFilterBuilder::create(SourceGraphic::create(filter));
     for (SVGElement* element = Traversal<SVGElement>::firstChild(*filterElement); element; element = Traversal<SVGElement>::nextSibling(*element)) {
         if (!element->isFilterEffect() || !element->layoutObject())
             continue;
 
         SVGFilterPrimitiveStandardAttributes* effectElement = static_cast<SVGFilterPrimitiveStandardAttributes*>(element);
         RefPtrWillBeRawPtr<FilterEffect> effect = effectElement->build(builder.get(), filter);
         if (!effect) {
             builder->clearEffects();
             return nullptr;
         }
@@ skipping 36 matching lines @@
             return;
         builder->clearResultsRecursive(effect);
 
         // Issue paint invalidations for the image on the screen.
         markClientForInvalidation(it->key, PaintInvalidation);
     }
     markAllClientLayersForInvalidation();
 }
 
 } // namespace blink