1/* 2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org> 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20#include "config.h" 21 22#if ENABLE(FILTERS) 23#include "SourceAlpha.h" 24 25#include "Color.h" 26#include "Filter.h" 27#include "GraphicsContext.h" 28#include "RenderTreeAsText.h" 29#include "TextStream.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::platformApplySoftware() 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, ColorSpaceDeviceRGB); 66 filterContext->drawImageBuffer(filter->sourceImage(), ColorSpaceDeviceRGB, IntPoint(), CompositeDestinationIn); 67} 68 69void SourceAlpha::dump() 70{ 71} 72 73TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const 74{ 75 writeIndent(ts, indent); 76 ts << "[SourceAlpha]\n"; 77 return ts; 78} 79 80} // namespace WebCore 81 82#endif // ENABLE(FILTERS) 83