1 /* 2 * Copyright (C) 2009 Dirk Schulze <krit (at) 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 blink { 31 32 class PLATFORM_EXPORT Filter : public RefCounted<Filter> { 33 public: 34 Filter(const AffineTransform& absoluteTransform) 35 : m_absoluteTransform(absoluteTransform) 36 , m_inverseTransform(absoluteTransform.inverse()) 37 { 38 // Filters can only accept scaling and translating transformations, as coordinates 39 // in most primitives are given in horizontal and vertical directions. 40 ASSERT(!absoluteTransform.b() && !absoluteTransform.c()); 41 } 42 virtual ~Filter() { } 43 44 void setSourceImage(PassOwnPtr<ImageBuffer> sourceImage) { m_sourceImage = sourceImage; } 45 ImageBuffer* sourceImage() { return m_sourceImage.get(); } 46 47 const AffineTransform& absoluteTransform() const { return m_absoluteTransform; } 48 49 void setAbsoluteTransform(const AffineTransform& absoluteTransform) 50 { 51 // Filters can only accept scaling and translating transformations, as coordinates 52 // in most primitives are given in horizontal and vertical directions. 53 ASSERT(!absoluteTransform.b() && !absoluteTransform.c()); 54 m_absoluteTransform = absoluteTransform; 55 m_inverseTransform = absoluteTransform.inverse(); 56 m_absoluteFilterRegion = m_absoluteTransform.mapRect(m_filterRegion); 57 } 58 FloatPoint mapAbsolutePointToLocalPoint(const FloatPoint& point) const { return m_inverseTransform.mapPoint(point); } 59 FloatRect mapLocalRectToAbsoluteRect(const FloatRect& rect) const { return m_absoluteTransform.mapRect(rect); } 60 FloatRect mapAbsoluteRectToLocalRect(const FloatRect& rect) const { return m_inverseTransform.mapRect(rect); } 61 62 virtual float applyHorizontalScale(float value) const 63 { 64 return value * m_absoluteTransform.a(); 65 } 66 virtual float applyVerticalScale(float value) const 67 { 68 return value * m_absoluteTransform.d(); 69 } 70 virtual FloatPoint3D resolve3dPoint(const FloatPoint3D& point) const { return point; } 71 72 virtual IntRect sourceImageRect() const = 0; 73 74 FloatRect absoluteFilterRegion() const { return m_absoluteFilterRegion; } 75 76 FloatRect filterRegion() const { return m_filterRegion; } 77 void setFilterRegion(const FloatRect& rect) 78 { 79 m_filterRegion = rect; 80 m_absoluteFilterRegion = m_absoluteTransform.mapRect(m_filterRegion); 81 } 82 83 private: 84 OwnPtr<ImageBuffer> m_sourceImage; 85 AffineTransform m_absoluteTransform; 86 AffineTransform m_inverseTransform; 87 FloatRect m_absoluteFilterRegion; 88 FloatRect m_filterRegion; 89 }; 90 91 } // namespace blink 92 93 #endif // Filter_h 94
