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 #ifndef Filter_h 22 #define Filter_h 23 24 #include "platform/PlatformExport.h" 25 #include "platform/geometry/FloatRect.h" 26 #include "platform/geometry/FloatSize.h" 27 #include "platform/graphics/ImageBuffer.h" 28 #include "wtf/RefCounted.h" 29 30 namespace WebCore { 31 32 class FilterEffect; 33 34 class PLATFORM_EXPORT Filter : public RefCounted<Filter> { 35 public: Filter(const AffineTransform & absoluteTransform)36 Filter(const AffineTransform& absoluteTransform) : m_isAccelerated(false), m_absoluteTransform(absoluteTransform) { } ~Filter()37 virtual ~Filter() { } 38 setSourceImage(PassOwnPtr<ImageBuffer> sourceImage)39 void setSourceImage(PassOwnPtr<ImageBuffer> sourceImage) { m_sourceImage = sourceImage; } sourceImage()40 ImageBuffer* sourceImage() { return m_sourceImage.get(); } 41 filterResolution()42 FloatSize filterResolution() const { return m_filterResolution; } setFilterResolution(const FloatSize & filterResolution)43 void setFilterResolution(const FloatSize& filterResolution) { m_filterResolution = filterResolution; } 44 absoluteTransform()45 const AffineTransform& absoluteTransform() const { return m_absoluteTransform; } setAbsoluteTransform(const AffineTransform & absoluteTransform)46 void setAbsoluteTransform(const AffineTransform& absoluteTransform) { m_absoluteTransform = absoluteTransform; } mapAbsolutePointToLocalPoint(const FloatPoint & point)47 FloatPoint mapAbsolutePointToLocalPoint(const FloatPoint& point) const { return m_absoluteTransform.inverse().mapPoint(point); } 48 isAccelerated()49 bool isAccelerated() const { return m_isAccelerated; } setIsAccelerated(bool isAccelerated)50 void setIsAccelerated(bool isAccelerated) { m_isAccelerated = isAccelerated; } 51 applyHorizontalScale(float value)52 virtual float applyHorizontalScale(float value) const 53 { 54 float filterRegionScale = absoluteFilterRegion().isEmpty() || filterRegion().isEmpty() ? 55 1.0f : absoluteFilterRegion().width() / filterRegion().width(); 56 return value * m_filterResolution.width() * filterRegionScale; 57 } applyVerticalScale(float value)58 virtual float applyVerticalScale(float value) const 59 { 60 float filterRegionScale = absoluteFilterRegion().isEmpty() || filterRegion().isEmpty() ? 61 1.0f : absoluteFilterRegion().height() / filterRegion().height(); 62 return value * m_filterResolution.height() * filterRegionScale; 63 } 64 65 virtual FloatRect sourceImageRect() const = 0; 66 absoluteFilterRegion()67 FloatRect absoluteFilterRegion() const { return m_absoluteFilterRegion; } setAbsoluteFilterRegion(const FloatRect & rect)68 void setAbsoluteFilterRegion(const FloatRect& rect) { m_absoluteFilterRegion = rect; } 69 filterRegion()70 FloatRect filterRegion() const { return m_filterRegion; } setFilterRegion(const FloatRect & rect)71 void setFilterRegion(const FloatRect& rect) { m_filterRegion = rect; } 72 73 private: 74 OwnPtr<ImageBuffer> m_sourceImage; 75 FloatSize m_filterResolution; 76 bool m_isAccelerated; 77 AffineTransform m_absoluteTransform; 78 FloatRect m_absoluteFilterRegion; 79 FloatRect m_filterRegion; 80 }; 81 82 } // namespace WebCore 83 84 #endif // Filter_h 85