WebCore/CSSGradientValue.h

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef CSSGradientValue_h
  27 #define CSSGradientValue_h
  28
  29 #include "CSSImageGeneratorValue.h"
  30 #include "CSSPrimitiveValue.h"
  31 #include <wtf/RefPtr.h>
  32 #include <wtf/Vector.h>
  33
  34 namespace WebCore {
  35
  36 class FloatPoint;
  37 class Gradient;
  38
  39 enum CSSGradientType { CSSLinearGradient, CSSRadialGradient };
  40
  41 struct CSSGradientColorStop {
  42     CSSGradientColorStop()
  43         : m_stop(0)
  44     {
  45     }
  46
  47     float m_stop;
  48     RefPtr<CSSPrimitiveValue> m_color;
  49 };
  50
  51 class CSSGradientValue : public CSSImageGeneratorValue {
  52 public:
  53     static PassRefPtr<CSSGradientValue> create()
  54     {
  55         return adoptRef(new CSSGradientValue);
  56     }
  57
  58     virtual String cssText() const;
  59
  60     virtual Image* image(RenderObject*, const IntSize&);
  61
  62     CSSGradientType type() const { return m_type; }
  63     void setType(CSSGradientType type) { m_type = type; }
  64
  65     void setFirstX(PassRefPtr<CSSPrimitiveValue> val) { m_firstX = val; }
  66     void setFirstY(PassRefPtr<CSSPrimitiveValue> val) { m_firstY = val; }
  67     void setSecondX(PassRefPtr<CSSPrimitiveValue> val) { m_secondX = val; }
  68     void setSecondY(PassRefPtr<CSSPrimitiveValue> val) { m_secondY = val; }
  69
  70     void setFirstRadius(PassRefPtr<CSSPrimitiveValue> val) { m_firstRadius = val; }
  71     void setSecondRadius(PassRefPtr<CSSPrimitiveValue> val) { m_secondRadius = val; }
  72
  73     void addStop(const CSSGradientColorStop& stop) { m_stops.append(stop); }
  74
  75     void sortStopsIfNeeded();
  76
  77 private:
  78     CSSGradientValue()
  79         : m_type(CSSLinearGradient)
  80         , m_stopsSorted(false)
  81     {
  82     }
  83
  84     // Create the gradient for a given size.
  85     PassRefPtr<Gradient> createGradient(RenderObject*, const IntSize&);
  86
  87     // Resolve points/radii to front end values.
  88     FloatPoint resolvePoint(CSSPrimitiveValue*, CSSPrimitiveValue*, const IntSize&, float zoomFactor);
  89     float resolveRadius(CSSPrimitiveValue*, float zoomFactor);
  90
  91     // Type
  92     CSSGradientType m_type;
  93
  94     // Points
  95     RefPtr<CSSPrimitiveValue> m_firstX;
  96     RefPtr<CSSPrimitiveValue> m_firstY;
  97
  98     RefPtr<CSSPrimitiveValue> m_secondX;
  99     RefPtr<CSSPrimitiveValue> m_secondY;
 100
 101     // Radii (for radial gradients only)
 102     RefPtr<CSSPrimitiveValue> m_firstRadius;
 103     RefPtr<CSSPrimitiveValue> m_secondRadius;
 104
 105     // Stops
 106     Vector<CSSGradientColorStop> m_stops;
 107     bool m_stopsSorted;
 108 };
 109
 110 } // namespace WebCore
 111
 112 #endif // CSSGradientValue_h