1 /* 2 * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved. 3 * Copyright (C) 2007 Alp Toker <alp@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 #if PLATFORM(ANDROID) 62 #include "SkShader.h" 63 typedef class PlatformGradientRec* PlatformGradient; 64 #else 65 class SkShader; 66 typedef class SkShader* PlatformGradient; 67 typedef class SkShader* PlatformPattern; 68 #endif 69 #elif PLATFORM(HAIKU) 70 class BGradient; 71 typedef BGradient* PlatformGradient; 72 #else 73 typedef void* PlatformGradient; 74 #endif 75 76 namespace WebCore { 77 78 class Color; 79 80 class Gradient : public Generator { 81 public: create(const FloatPoint & p0,const FloatPoint & p1)82 static PassRefPtr<Gradient> create(const FloatPoint& p0, const FloatPoint& p1) 83 { 84 return adoptRef(new Gradient(p0, p1)); 85 } 86 static PassRefPtr<Gradient> create(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio = 1) 87 { 88 return adoptRef(new Gradient(p0, r0, p1, r1, aspectRatio)); 89 } 90 virtual ~Gradient(); 91 92 struct ColorStop; 93 void addColorStop(const ColorStop&); 94 void addColorStop(float, const Color&); 95 96 void getColor(float value, float* r, float* g, float* b, float* a) const; 97 bool hasAlpha() const; 98 isRadial()99 bool isRadial() const { return m_radial; } isZeroSize()100 bool isZeroSize() const { return m_p0.x() == m_p1.x() && m_p0.y() == m_p1.y() && (!m_radial || m_r0 == m_r1); } 101 p0()102 const FloatPoint& p0() const { return m_p0; } p1()103 const FloatPoint& p1() const { return m_p1; } 104 setP0(const FloatPoint & p)105 void setP0(const FloatPoint& p) { m_p0 = p; } setP1(const FloatPoint & p)106 void setP1(const FloatPoint& p) { m_p1 = p; } 107 startRadius()108 float startRadius() const { return m_r0; } endRadius()109 float endRadius() const { return m_r1; } 110 setStartRadius(float r)111 void setStartRadius(float r) { m_r0 = r; } setEndRadius(float r)112 void setEndRadius(float r) { m_r1 = r; } 113 aspectRatio()114 float aspectRatio() const { return m_aspectRatio; } 115 116 #if OS(WINCE) && !PLATFORM(QT) 117 const Vector<ColorStop, 2>& getStops() const; 118 #else 119 #if PLATFORM(ANDROID) 120 SkShader* getShader(SkShader::TileMode); 121 #endif 122 PlatformGradient platformGradient(); 123 #endif 124 125 struct ColorStop { 126 float stop; 127 float red; 128 float green; 129 float blue; 130 float alpha; 131 ColorStopColorStop132 ColorStop() : stop(0), red(0), green(0), blue(0), alpha(0) { } ColorStopColorStop133 ColorStop(float s, float r, float g, float b, float a) : stop(s), red(r), green(g), blue(b), alpha(a) { } 134 }; 135 setStopsSorted(bool s)136 void setStopsSorted(bool s) { m_stopsSorted = s; } 137 138 void setSpreadMethod(GradientSpreadMethod); spreadMethod()139 GradientSpreadMethod spreadMethod() { return m_spreadMethod; } 140 void setGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation); 141 // Qt and CG transform the gradient at draw time gradientSpaceTransform()142 AffineTransform gradientSpaceTransform() { return m_gradientSpaceTransformation; } 143 144 virtual void fill(GraphicsContext*, const FloatRect&); 145 virtual void adjustParametersForTiledDrawing(IntSize& size, FloatRect& srcRect); 146 147 void setPlatformGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation); 148 149 #if USE(CG) 150 void paint(CGContextRef); 151 void paint(GraphicsContext*); 152 #endif 153 154 private: 155 Gradient(const FloatPoint& p0, const FloatPoint& p1); 156 Gradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio); 157 platformInit()158 void platformInit() { m_gradient = 0; } 159 void platformDestroy(); 160 161 int findStop(float value) const; 162 void sortStopsIfNecessary(); 163 164 bool m_radial; 165 FloatPoint m_p0; 166 FloatPoint m_p1; 167 float m_r0; 168 float m_r1; 169 float m_aspectRatio; // For elliptical gradient, width / height. 170 mutable Vector<ColorStop, 2> m_stops; 171 mutable bool m_stopsSorted; 172 mutable int m_lastStop; 173 GradientSpreadMethod m_spreadMethod; 174 AffineTransform m_gradientSpaceTransformation; 175 176 PlatformGradient m_gradient; 177 }; 178 179 } //namespace 180 181 #endif 182