1 /* 2 * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved. 3 * Copyright (C) 2007 Alp Toker <alp (at) atoker.com> 4 * Copyright (C) 2008 Torch Mobile, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef Gradient_h 29 #define Gradient_h 30 31 #include "AffineTransform.h" 32 #include "FloatPoint.h" 33 #include "Generator.h" 34 #include "GraphicsTypes.h" 35 #include <wtf/PassRefPtr.h> 36 #include <wtf/Vector.h> 37 38 #if USE(CG) 39 40 typedef struct CGContext* CGContextRef; 41 42 #define USE_CG_SHADING defined(BUILDING_ON_TIGER) || defined(BUILDING_ON_LEOPARD) 43 44 #if USE_CG_SHADING 45 typedef struct CGShading* CGShadingRef; 46 typedef CGShadingRef PlatformGradient; 47 #else 48 typedef struct CGGradient* CGGradientRef; 49 typedef CGGradientRef PlatformGradient; 50 #endif 51 52 #elif PLATFORM(QT) 53 QT_BEGIN_NAMESPACE 54 class QGradient; 55 QT_END_NAMESPACE 56 typedef QGradient* PlatformGradient; 57 #elif USE(CAIRO) 58 typedef struct _cairo_pattern cairo_pattern_t; 59 typedef cairo_pattern_t* PlatformGradient; 60 #elif USE(SKIA) 61 class SkShader; 62 typedef class SkShader* PlatformGradient; 63 typedef class SkShader* PlatformPattern; 64 #elif PLATFORM(HAIKU) 65 class BGradient; 66 typedef BGradient* PlatformGradient; 67 #else 68 typedef void* PlatformGradient; 69 #endif 70 71 namespace WebCore { 72 73 class Color; 74 75 class Gradient : public Generator { 76 public: 77 static PassRefPtr<Gradient> create(const FloatPoint& p0, const FloatPoint& p1) 78 { 79 return adoptRef(new Gradient(p0, p1)); 80 } 81 static PassRefPtr<Gradient> create(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio = 1) 82 { 83 return adoptRef(new Gradient(p0, r0, p1, r1, aspectRatio)); 84 } 85 virtual ~Gradient(); 86 87 struct ColorStop; 88 void addColorStop(const ColorStop&); 89 void addColorStop(float, const Color&); 90 91 void getColor(float value, float* r, float* g, float* b, float* a) const; 92 bool hasAlpha() const; 93 94 bool isRadial() const { return m_radial; } 95 bool isZeroSize() const { return m_p0.x() == m_p1.x() && m_p0.y() == m_p1.y() && (!m_radial || m_r0 == m_r1); } 96 97 const FloatPoint& p0() const { return m_p0; } 98 const FloatPoint& p1() const { return m_p1; } 99 100 void setP0(const FloatPoint& p) { m_p0 = p; } 101 void setP1(const FloatPoint& p) { m_p1 = p; } 102 103 float startRadius() const { return m_r0; } 104 float endRadius() const { return m_r1; } 105 106 void setStartRadius(float r) { m_r0 = r; } 107 void setEndRadius(float r) { m_r1 = r; } 108 109 float aspectRatio() const { return m_aspectRatio; } 110 111 #if OS(WINCE) && !PLATFORM(QT) 112 const Vector<ColorStop, 2>& getStops() const; 113 #else 114 PlatformGradient platformGradient(); 115 #endif 116 117 struct ColorStop { 118 float stop; 119 float red; 120 float green; 121 float blue; 122 float alpha; 123 124 ColorStop() : stop(0), red(0), green(0), blue(0), alpha(0) { } 125 ColorStop(float s, float r, float g, float b, float a) : stop(s), red(r), green(g), blue(b), alpha(a) { } 126 }; 127 128 void setStopsSorted(bool s) { m_stopsSorted = s; } 129 130 void setSpreadMethod(GradientSpreadMethod); 131 GradientSpreadMethod spreadMethod() { return m_spreadMethod; } 132 void setGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation); 133 // Qt and CG transform the gradient at draw time 134 AffineTransform gradientSpaceTransform() { return m_gradientSpaceTransformation; } 135 136 virtual void fill(GraphicsContext*, const FloatRect&); 137 virtual void adjustParametersForTiledDrawing(IntSize& size, FloatRect& srcRect); 138 139 void setPlatformGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation); 140 141 #if USE(CG) 142 void paint(CGContextRef); 143 void paint(GraphicsContext*); 144 #endif 145 146 private: 147 Gradient(const FloatPoint& p0, const FloatPoint& p1); 148 Gradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio); 149 150 void platformInit() { m_gradient = 0; } 151 void platformDestroy(); 152 153 int findStop(float value) const; 154 void sortStopsIfNecessary(); 155 156 bool m_radial; 157 FloatPoint m_p0; 158 FloatPoint m_p1; 159 float m_r0; 160 float m_r1; 161 float m_aspectRatio; // For elliptical gradient, width / height. 162 mutable Vector<ColorStop, 2> m_stops; 163 mutable bool m_stopsSorted; 164 mutable int m_lastStop; 165 GradientSpreadMethod m_spreadMethod; 166 AffineTransform m_gradientSpaceTransformation; 167 168 PlatformGradient m_gradient; 169 }; 170 171 } //namespace 172 173 #endif 174
