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 "TextStream.h" 29#include <wtf/StdLibExtras.h> 30#include <wtf/text/WTFString.h> 31 32namespace WebCore { 33 34PassRefPtr<SourceAlpha> SourceAlpha::create(Filter* filter) 35{ 36 return adoptRef(new SourceAlpha(filter)); 37} 38 39const AtomicString& SourceAlpha::effectName() 40{ 41 DEPRECATED_DEFINE_STATIC_LOCAL(const AtomicString, s_effectName, ("SourceAlpha", AtomicString::ConstructFromLiteral)); 42 return s_effectName; 43} 44 45void SourceAlpha::determineAbsolutePaintRect() 46{ 47 Filter& filter = this->filter(); 48 FloatRect paintRect = filter.sourceImageRect(); 49 paintRect.scale(filter.filterResolution().width(), filter.filterResolution().height()); 50 setAbsolutePaintRect(enclosingIntRect(paintRect)); 51} 52 53void SourceAlpha::platformApplySoftware() 54{ 55 ImageBuffer* resultImage = createImageBufferResult(); 56 Filter& filter = this->filter(); 57 if (!resultImage || !filter.sourceImage()) 58 return; 59 60 setIsAlphaImage(true); 61 62 FloatRect imageRect(FloatPoint(), absolutePaintRect().size()); 63 GraphicsContext* filterContext = resultImage->context(); 64 filterContext->fillRect(imageRect, Color::black, ColorSpaceDeviceRGB); 65 filterContext->drawImageBuffer(filter.sourceImage(), ColorSpaceDeviceRGB, IntPoint(), CompositeDestinationIn); 66} 67 68void SourceAlpha::dump() 69{ 70} 71 72TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const 73{ 74 writeIndent(ts, indent); 75 ts << "[SourceAlpha]\n"; 76 return ts; 77} 78 79} // namespace WebCore 80 81#endif // ENABLE(FILTERS) 82