WebCore/Gradient.h

   1 /*
   2  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
   3  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef Gradient_h
  28 #define Gradient_h
  29
  30 #include "FloatPoint.h"
  31 #include "Generator.h"
  32 #include <wtf/PassRefPtr.h>
  33 #include <wtf/Vector.h>
  34
  35 #if PLATFORM(CG)
  36 typedef struct CGShading* CGShadingRef;
  37 typedef CGShadingRef PlatformGradient;
  38 #elif PLATFORM(QT)
  39 QT_BEGIN_NAMESPACE
  40 class QGradient;
  41 QT_END_NAMESPACE
  42 typedef QGradient* PlatformGradient;
  43 #elif PLATFORM(CAIRO)
  44 typedef struct _cairo_pattern cairo_pattern_t;
  45 typedef cairo_pattern_t* PlatformGradient;
  46 #elif PLATFORM(SKIA)
  47 class SkShader;
  48 typedef class SkShader* PlatformGradient;
  49 typedef class SkShader* PlatformPattern;
  50 #else
  51 typedef void* PlatformGradient;
  52 #endif
  53
  54 namespace WebCore {
  55
  56     class Color;
  57
  58     class Gradient : public Generator {
  59     public:
  60         static PassRefPtr<Gradient> create(const FloatPoint& p0, const FloatPoint& p1)
  61         {
  62             return adoptRef(new Gradient(p0, p1));
  63         }
  64         static PassRefPtr<Gradient> create(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1)
  65         {
  66             return adoptRef(new Gradient(p0, r0, p1, r1));
  67         }
  68         virtual ~Gradient();
  69
  70         void addColorStop(float, const Color&);
  71
  72         void getColor(float value, float* r, float* g, float* b, float* a) const;
  73
  74         PlatformGradient platformGradient();
  75
  76         struct ColorStop {
  77             float stop;
  78             float red;
  79             float green;
  80             float blue;
  81             float alpha;
  82
  83             ColorStop() : stop(0), red(0), green(0), blue(0), alpha(0) { }
  84             ColorStop(float s, float r, float g, float b, float a) : stop(s), red(r), green(g), blue(b), alpha(a) { }
  85         };
  86
  87         void setStopsSorted(bool s) { m_stopsSorted = s; }
  88
  89         virtual void fill(GraphicsContext*, const FloatRect&);
  90
  91     private:
  92         Gradient(const FloatPoint& p0, const FloatPoint& p1);
  93         Gradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1);
  94
  95         void platformInit() { m_gradient = 0; }
  96         void platformDestroy();
  97
  98         int findStop(float value) const;
  99
 100         bool m_radial;
 101         FloatPoint m_p0;
 102         FloatPoint m_p1;
 103         float m_r0;
 104         float m_r1;
 105         mutable Vector<ColorStop> m_stops;
 106         mutable bool m_stopsSorted;
 107         mutable int m_lastStop;
 108
 109         PlatformGradient m_gradient;
 110     };
 111
 112 } //namespace
 113
 114 #endif