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) 2013 Google Inc. All rights reserved. 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public License 18 * along with this library; see the file COPYING.LIB. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20 * Boston, MA 02110-1301, USA. 21 */ 22 23 #ifndef FEComponentTransfer_h 24 #define FEComponentTransfer_h 25 26 #include "platform/graphics/filters/Filter.h" 27 #include "platform/graphics/filters/FilterEffect.h" 28 #include "wtf/Vector.h" 29 30 namespace blink { 31 32 enum ComponentTransferType { 33 FECOMPONENTTRANSFER_TYPE_UNKNOWN = 0, 34 FECOMPONENTTRANSFER_TYPE_IDENTITY = 1, 35 FECOMPONENTTRANSFER_TYPE_TABLE = 2, 36 FECOMPONENTTRANSFER_TYPE_DISCRETE = 3, 37 FECOMPONENTTRANSFER_TYPE_LINEAR = 4, 38 FECOMPONENTTRANSFER_TYPE_GAMMA = 5 39 }; 40 41 struct ComponentTransferFunction { 42 ComponentTransferFunction() 43 : type(FECOMPONENTTRANSFER_TYPE_UNKNOWN) 44 , slope(0) 45 , intercept(0) 46 , amplitude(0) 47 , exponent(0) 48 , offset(0) 49 { 50 } 51 52 ComponentTransferType type; 53 54 float slope; 55 float intercept; 56 float amplitude; 57 float exponent; 58 float offset; 59 60 Vector<float> tableValues; 61 }; 62 63 class PLATFORM_EXPORT FEComponentTransfer : public FilterEffect { 64 public: 65 static PassRefPtr<FEComponentTransfer> create(Filter*, const ComponentTransferFunction& redFunc, const ComponentTransferFunction& greenFunc, 66 const ComponentTransferFunction& blueFunc, const ComponentTransferFunction& alphaFunc); 67 68 ComponentTransferFunction redFunction() const; 69 void setRedFunction(const ComponentTransferFunction&); 70 71 ComponentTransferFunction greenFunction() const; 72 void setGreenFunction(const ComponentTransferFunction&); 73 74 ComponentTransferFunction blueFunction() const; 75 void setBlueFunction(const ComponentTransferFunction&); 76 77 ComponentTransferFunction alphaFunction() const; 78 void setAlphaFunction(const ComponentTransferFunction&); 79 80 virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE; 81 82 virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE; 83 84 private: 85 FEComponentTransfer(Filter*, const ComponentTransferFunction& redFunc, const ComponentTransferFunction& greenFunc, 86 const ComponentTransferFunction& blueFunc, const ComponentTransferFunction& alphaFunc); 87 88 virtual void applySoftware() OVERRIDE; 89 90 virtual bool affectsTransparentPixels() OVERRIDE; 91 92 void getValues(unsigned char rValues[256], unsigned char gValues[256], unsigned char bValues[256], unsigned char aValues[256]); 93 94 ComponentTransferFunction m_redFunc; 95 ComponentTransferFunction m_greenFunc; 96 ComponentTransferFunction m_blueFunc; 97 ComponentTransferFunction m_alphaFunc; 98 }; 99 100 } // namespace blink 101 102 #endif // FEComponentTransfer_h 103
