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 "third_party/skia/include/core/SkImageFilter.h" 29 #include "wtf/RefCounted.h" 30 31 namespace WebCore { 32 33 class FilterEffect; 34 35 class PLATFORM_EXPORT Filter : public RefCounted<Filter> { 36 public: Filter(const AffineTransform & absoluteTransform)37 Filter(const AffineTransform& absoluteTransform) 38 : m_absoluteTransform(absoluteTransform) 39 , m_inverseTransform(absoluteTransform.inverse()) 40 { 41 // Filters can only accept scaling and translating transformations, as coordinates 42 // in most primitives are given in horizontal and vertical directions. 43 ASSERT(!absoluteTransform.b() && !absoluteTransform.c()); 44 } ~Filter()45 virtual ~Filter() { } 46 setSourceImage(PassOwnPtr<ImageBuffer> sourceImage)47 void setSourceImage(PassOwnPtr<ImageBuffer> sourceImage) { m_sourceImage = sourceImage; } sourceImage()48 ImageBuffer* sourceImage() { return m_sourceImage.get(); } 49 absoluteTransform()50 const AffineTransform& absoluteTransform() const { return m_absoluteTransform; } 51 setAbsoluteTransform(const AffineTransform & absoluteTransform)52 void setAbsoluteTransform(const AffineTransform& absoluteTransform) 53 { 54 // Filters can only accept scaling and translating transformations, as coordinates 55 // in most primitives are given in horizontal and vertical directions. 56 ASSERT(!absoluteTransform.b() && !absoluteTransform.c()); 57 m_absoluteTransform = absoluteTransform; 58 m_inverseTransform = absoluteTransform.inverse(); 59 m_absoluteFilterRegion = m_absoluteTransform.mapRect(m_filterRegion); 60 } mapAbsolutePointToLocalPoint(const FloatPoint & point)61 FloatPoint mapAbsolutePointToLocalPoint(const FloatPoint& point) const { return m_inverseTransform.mapPoint(point); } mapLocalRectToAbsoluteRect(const FloatRect & rect)62 FloatRect mapLocalRectToAbsoluteRect(const FloatRect& rect) const { return m_absoluteTransform.mapRect(rect); } mapAbsoluteRectToLocalRect(const FloatRect & rect)63 FloatRect mapAbsoluteRectToLocalRect(const FloatRect& rect) const { return m_inverseTransform.mapRect(rect); } 64 applyHorizontalScale(float value)65 virtual float applyHorizontalScale(float value) const 66 { 67 return value * m_absoluteTransform.a(); 68 } applyVerticalScale(float value)69 virtual float applyVerticalScale(float value) const 70 { 71 return value * m_absoluteTransform.d(); 72 } resolve3dPoint(const FloatPoint3D & point)73 virtual FloatPoint3D resolve3dPoint(const FloatPoint3D& point) const { return point; } 74 75 virtual IntRect sourceImageRect() const = 0; 76 absoluteFilterRegion()77 FloatRect absoluteFilterRegion() const { return m_absoluteFilterRegion; } 78 filterRegion()79 FloatRect filterRegion() const { return m_filterRegion; } setFilterRegion(const FloatRect & rect)80 void setFilterRegion(const FloatRect& rect) 81 { 82 m_filterRegion = rect; 83 m_absoluteFilterRegion = m_absoluteTransform.mapRect(m_filterRegion); 84 } 85 86 // The methods enableCache() and disableCache() are temporary, and we 87 // should address the real issue inside skia, thus simplifying what the 88 // clients have to know, and can remove these. 89 // Also note that this cache should no longer be used by Blink once the 90 // NON impl-side painting path is removed. enableCache()91 void enableCache() 92 { 93 if (!m_cache) 94 m_cache = adoptRef(SkImageFilter::Cache::Create(1)); 95 SkImageFilter::SetExternalCache(m_cache.get()); 96 } 97 disableCache()98 void disableCache() 99 { 100 SkImageFilter::SetExternalCache(0); 101 } 102 removeFromCache(SkImageFilter * filter)103 void removeFromCache(SkImageFilter* filter) 104 { 105 if (m_cache) 106 m_cache->remove(filter); 107 } 108 109 private: 110 OwnPtr<ImageBuffer> m_sourceImage; 111 AffineTransform m_absoluteTransform; 112 AffineTransform m_inverseTransform; 113 FloatRect m_absoluteFilterRegion; 114 FloatRect m_filterRegion; 115 RefPtr<SkImageFilter::Cache> m_cache; 116 }; 117 118 } // namespace WebCore 119 120 #endif // Filter_h 121