1 /* 2 * Copyright (C) 2009 Dirk Schulze <krit (at) 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 "PlatformString.h" 29 #include "RenderTreeAsText.h" 30 #include "TextStream.h" 31 32 #include <wtf/StdLibExtras.h> 33 34 namespace WebCore { 35 36 PassRefPtr<SourceAlpha> SourceAlpha::create(Filter* filter) 37 { 38 return adoptRef(new SourceAlpha(filter)); 39 } 40 41 const AtomicString& SourceAlpha::effectName() 42 { 43 DEFINE_STATIC_LOCAL(const AtomicString, s_effectName, ("SourceAlpha")); 44 return s_effectName; 45 } 46 47 void SourceAlpha::determineAbsolutePaintRect() 48 { 49 Filter* filter = this->filter(); 50 FloatRect paintRect = filter->sourceImageRect(); 51 paintRect.scale(filter->filterResolution().width(), filter->filterResolution().height()); 52 setAbsolutePaintRect(enclosingIntRect(paintRect)); 53 } 54 55 void SourceAlpha::apply() 56 { 57 if (hasResult()) 58 return; 59 ImageBuffer* resultImage = createImageBufferResult(); 60 Filter* filter = this->filter(); 61 if (!resultImage || !filter->sourceImage()) 62 return; 63 64 setIsAlphaImage(true); 65 66 FloatRect imageRect(FloatPoint(), absolutePaintRect().size()); 67 GraphicsContext* filterContext = resultImage->context(); 68 filterContext->save(); 69 filterContext->clipToImageBuffer(filter->sourceImage(), imageRect); 70 filterContext->fillRect(imageRect, Color::black, ColorSpaceDeviceRGB); 71 filterContext->restore(); 72 } 73 74 void SourceAlpha::dump() 75 { 76 } 77 78 TextStream& SourceAlpha::externalRepresentation(TextStream& ts, int indent) const 79 { 80 writeIndent(ts, indent); 81 ts << "[SourceAlpha]\n"; 82 return ts; 83 } 84 85 } // namespace WebCore 86 87 #endif // ENABLE(FILTERS) 88