1 /* 2 * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com> 3 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org> 4 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org> 5 * Copyright (C) 2005 Eric Seidel <eric@webkit.org> 6 * Copyright (C) 2010 Zoltan Herczeg <zherczeg@webkit.org> 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 #ifndef LightSource_h 25 #define LightSource_h 26 27 #if ENABLE(FILTERS) 28 #include "FloatPoint3D.h" 29 #include <wtf/PassRefPtr.h> 30 #include <wtf/RefCounted.h> 31 32 namespace WebCore { 33 34 enum LightType { 35 LS_DISTANT, 36 LS_POINT, 37 LS_SPOT 38 }; 39 40 class TextStream; 41 42 class LightSource : public RefCounted<LightSource> { 43 public: 44 45 // Light vectors must be calculated for every pixel during 46 // painting. It is expensive to pass all these arguments to 47 // a frequently called function, especially because not all 48 // light sources require all of them. Instead, we just pass 49 // a reference to the following structure 50 struct PaintingData { 51 // SVGFELighting also use them 52 FloatPoint3D lightVector; 53 FloatPoint3D colorVector; 54 float lightVectorLength; 55 // Private members 56 FloatPoint3D directionVector; 57 FloatPoint3D privateColorVector; 58 float coneCutOffLimit; 59 float coneFullLight; 60 int specularExponent; 61 }; 62 LightSource(LightType type)63 LightSource(LightType type) 64 : m_type(type) 65 { } 66 ~LightSource()67 virtual ~LightSource() { } 68 type()69 LightType type() const { return m_type; } 70 virtual TextStream& externalRepresentation(TextStream&) const = 0; 71 72 virtual void initPaintingData(PaintingData&) = 0; 73 // z is a float number, since it is the alpha value scaled by a user 74 // specified "surfaceScale" constant, which type is <number> in the SVG standard 75 virtual void updatePaintingData(PaintingData&, int x, int y, float z) = 0; 76 77 bool setAzimuth(float); 78 bool setElevation(float); 79 bool setX(float); 80 bool setY(float); 81 bool setZ(float); 82 bool setPointsAtX(float); 83 bool setPointsAtY(float); 84 bool setPointsAtZ(float); 85 bool setSpecularExponent(float); 86 bool setLimitingConeAngle(float); 87 88 private: 89 LightType m_type; 90 }; 91 92 } // namespace WebCore 93 94 #endif // ENABLE(FILTERS) 95 96 #endif // LightSource_h 97