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SVGPaintServerGradient.h

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00001 /*
00002  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  * 1. Redistributions of source code must retain the above copyright
00008  *    notice, this list of conditions and the following disclaimer.
00009  * 2. Redistributions in binary form must reproduce the above copyright
00010  *    notice, this list of conditions and the following disclaimer in the
00011  *    documentation and/or other materials provided with the distribution.
00012  *
00013  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
00014  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00015  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
00016  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
00017  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00018  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00019  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00020  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
00021  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00022  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00023  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
00024  */
00025 
00026 #ifndef SVGPaintServerGradient_h
00027 #define SVGPaintServerGradient_h
00028 
00029 #if ENABLE(SVG)
00030 
00031 #include "AffineTransform.h"
00032 #include "SVGPaintServer.h"
00033 
00034 #include <wtf/RefCounted.h>
00035 #include <wtf/RefPtr.h>
00036 
00037 #if PLATFORM(QT)
00038 #include <qglobal.h>
00039 QT_BEGIN_NAMESPACE
00040 class QGradient;
00041 QT_END_NAMESPACE
00042 #endif
00043 
00044 namespace WebCore {
00045 
00046     class ImageBuffer;
00047     class SVGGradientElement;
00048 
00049     // FIXME: Remove the spread method enum in SVGGradientElement
00050     enum SVGGradientSpreadMethod {
00051         SPREADMETHOD_PAD = 1,
00052         SPREADMETHOD_REFLECT = 2,
00053         SPREADMETHOD_REPEAT = 3
00054     };
00055 
00056     typedef std::pair<float, QColor> SVGGradientStop;
00057 
00058 
00059     class SVGPaintServerGradient : public SVGPaintServer {
00060     public:
00061         virtual ~SVGPaintServerGradient();
00062 
00063         const Vector<SVGGradientStop>& gradientStops() const;
00064         void setGradientStops(const Vector<SVGGradientStop>&);
00065 
00066         SVGGradientSpreadMethod spreadMethod() const;
00067         void setGradientSpreadMethod(const SVGGradientSpreadMethod&);
00068 
00069         // Gradient start and end points are percentages when used in boundingBox mode.
00070         // For instance start point with value (0,0) is top-left and end point with
00071         // value (100, 100) is bottom-right. BoundingBox mode is enabled by default.
00072         bool boundingBoxMode() const;
00073         void setBoundingBoxMode(bool mode = true);
00074 
00075         AffineTransform gradientTransform() const;
00076         void setGradientTransform(const AffineTransform&);
00077 
00078         /*virtual TextStream& externalRepresentation(TextStream&) const;*/
00079 
00080         virtual bool setup(QPainter* painter, QPainterPath* path, const RenderObject*, SVGPaintTargetType, bool isPaintingText) const;
00081 #if PLATFORM(CG)
00082         virtual void teardown(GraphicsContext*&, const RenderObject*, SVGPaintTargetType, bool isPaintingText) const;
00083         virtual void renderPath(GraphicsContext*&, const RenderObject*, SVGPaintTargetType) const;
00084 
00085         virtual void invalidate();
00086 
00087         // Helpers
00088         void updateQuartzGradientStopsCache(const Vector<SVGGradientStop>&);
00089         void updateQuartzGradientCache(const SVGPaintServerGradient*);
00090         void handleBoundingBoxModeAndGradientTransformation(GraphicsContext*, const FloatRect& targetRect) const;
00091 #endif
00092 
00093 #if PLATFORM(QT)
00094     protected:
00095         void fillColorArray(QGradient&, const Vector<SVGGradientStop>&, float opacity) const;
00096         virtual QGradient setupGradient(QPainter* painter, QPainterPath* painterPath, const RenderObject*) const = 0;
00097 #endif
00098 
00099     protected:
00100         SVGPaintServerGradient(const SVGGradientElement* owner);
00101         
00102     private:
00103         Vector<SVGGradientStop> m_stops;
00104         SVGGradientSpreadMethod m_spreadMethod;
00105         bool m_boundingBoxMode;
00106         AffineTransform m_gradientTransform;
00107         const SVGGradientElement* m_ownerElement;
00108 
00109 #if PLATFORM(CG)
00110     public:
00111         typedef struct {
00112             CGFloat colorArray[4];
00113             CGFloat offset;
00114             CGFloat previousDeltaInverse;
00115         } QuartzGradientStop;
00116         
00117         struct SharedStopCache : public RefCounted<SharedStopCache> {
00118         public:
00119             static PassRefPtr<SharedStopCache> create() { return adoptRef(new SharedStopCache); }
00120             
00121             Vector<QuartzGradientStop> m_stops;
00122         
00123         private:
00124             SharedStopCache() { }
00125         };
00126 
00127         RefPtr<SharedStopCache> m_stopsCache;
00128 
00129         CGShadingRef m_shadingCache;
00130         mutable GraphicsContext* m_savedContext;
00131         mutable ImageBuffer* m_imageBuffer;
00132 #endif
00133     };
00134 
00135     inline SVGGradientStop makeGradientStop(float offset, const QColor& color)
00136     {
00137         return std::make_pair(offset, color);
00138     }
00139 
00140 } // namespace WebCore
00141 
00142 #endif
00143 
00144 #endif // SVGPaintServerGradient_h

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