1/* 2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> 3 * Copyright (C) 2013 Google Inc. All rights reserved. 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 */ 20 21#include "config.h" 22 23#include "core/platform/graphics/filters/SourceAlpha.h" 24 25#include "core/platform/graphics/Color.h" 26#include "core/platform/graphics/GraphicsContext.h" 27#include "core/platform/graphics/filters/Filter.h" 28#include "core/platform/text/TextStream.h" 29#include "core/rendering/RenderTreeAsText.h" 30#include "wtf/StdLibExtras.h" 31#include "wtf/text/WTFString.h" 32 33namespace WebCore { 34 35PassRefPtr<SourceAlpha> SourceAlpha::create(Filter* filter) 36{ 37 return adoptRef(new SourceAlpha(filter)); 38} 39 40const AtomicString& SourceAlpha::effectName() 41{ 42 DEFINE_STATIC_LOCAL(const AtomicString, s_effectName, ("SourceAlpha", AtomicString::ConstructFromLiteral)); 43 return s_effectName; 44} 45 46void SourceAlpha::determineAbsolutePaintRect() 47{ 48 Filter* filter = this->filter(); 49 FloatRect paintRect = filter->sourceImageRect(); 50 paintRect.scale(filter->filterResolution().width(), filter->filterResolution().height()); 51 setAbsolutePaintRect(enclosingIntRect(paintRect)); 52} 53 54void SourceAlpha::applySoftware() 55{ 56 ImageBuffer* resultImage = createImageBufferResult(); 57 Filter* filter = this->filter(); 58 if (!resultImage || !filter->sourceImage()) 59 return; 60 61 setIsAlphaImage(true); 62 63 FloatRect imageRect(FloatPoint(), absolutePaintRect().size()); 64 GraphicsContext* filterContext = resultImage->context(); 65 filterContext->fillRect(imageRect, Color::black); 66 filterContext->drawImageBuffer(filter->sourceImage(), IntPoint(), CompositeDestinationIn); 67} 68 69TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const 70{ 71 writeIndent(ts, indent); 72 ts << "[SourceAlpha]\n"; 73 return ts; 74} 75 76} // namespace WebCore 77