1 /* 2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann (at) kde.org> 3 * Copyright (C) 2004, 2005 Rob Buis <buis (at) kde.org> 4 * Copyright (C) 2005 Eric Seidel <eric (at) webkit.org> 5 * Copyright (C) 2009 Dirk Schulze <krit (at) webkit.org> 6 * Copyright (C) Research In Motion Limited 2010. All rights reserved. 7 * 8 * This library is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Library General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This library is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Library General Public License for more details. 17 * 18 * You should have received a copy of the GNU Library General Public License 19 * along with this library; see the file COPYING.LIB. If not, write to 20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 21 * Boston, MA 02110-1301, USA. 22 */ 23 24 #include "config.h" 25 26 #if ENABLE(FILTERS) 27 #include "FEOffset.h" 28 29 #include "Filter.h" 30 #include "GraphicsContext.h" 31 #include "RenderTreeAsText.h" 32 #include "TextStream.h" 33 34 namespace WebCore { 35 36 FEOffset::FEOffset(Filter* filter, float dx, float dy) 37 : FilterEffect(filter) 38 , m_dx(dx) 39 , m_dy(dy) 40 { 41 } 42 43 PassRefPtr<FEOffset> FEOffset::create(Filter* filter, float dx, float dy) 44 { 45 return adoptRef(new FEOffset(filter, dx, dy)); 46 } 47 48 float FEOffset::dx() const 49 { 50 return m_dx; 51 } 52 53 void FEOffset::setDx(float dx) 54 { 55 m_dx = dx; 56 } 57 58 float FEOffset::dy() const 59 { 60 return m_dy; 61 } 62 63 void FEOffset::setDy(float dy) 64 { 65 m_dy = dy; 66 } 67 68 void FEOffset::determineAbsolutePaintRect() 69 { 70 FloatRect paintRect = inputEffect(0)->absolutePaintRect(); 71 Filter* filter = this->filter(); 72 paintRect.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy)); 73 paintRect.intersect(maxEffectRect()); 74 setAbsolutePaintRect(enclosingIntRect(paintRect)); 75 } 76 77 void FEOffset::apply() 78 { 79 if (hasResult()) 80 return; 81 FilterEffect* in = inputEffect(0); 82 in->apply(); 83 if (!in->hasResult()) 84 return; 85 86 ImageBuffer* resultImage = createImageBufferResult(); 87 if (!resultImage) 88 return; 89 90 setIsAlphaImage(in->isAlphaImage()); 91 92 FloatRect drawingRegion = drawingRegionOfInputImage(in->absolutePaintRect()); 93 Filter* filter = this->filter(); 94 drawingRegion.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy)); 95 resultImage->context()->drawImageBuffer(in->asImageBuffer(), ColorSpaceDeviceRGB, drawingRegion); 96 } 97 98 void FEOffset::dump() 99 { 100 } 101 102 TextStream& FEOffset::externalRepresentation(TextStream& ts, int indent) const 103 { 104 writeIndent(ts, indent); 105 ts << "[feOffset"; 106 FilterEffect::externalRepresentation(ts); 107 ts << " dx=\"" << dx() << "\" dy=\"" << dy() << "\"]\n"; 108 inputEffect(0)->externalRepresentation(ts, indent + 1); 109 return ts; 110 } 111 112 } // namespace WebCore 113 114 #endif // ENABLE(FILTERS) 115