/platform/external/webkit/WebCore/css/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
 34namespace WebCore {
 35
 36class FloatPoint;
 37class Gradient;
 38
 39enum CSSGradientType { CSSLinearGradient, CSSRadialGradient };
 40
 41struct CSSGradientColorStop {
 42    CSSGradientColorStop()
 43        : m_stop(0)
 44    {
 45    }
 46    
 47    float m_stop;
 48    RefPtr<CSSPrimitiveValue> m_color;
 49};
 50
 51class CSSGradientValue : public CSSImageGeneratorValue {
 52public:
 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
 77private:
 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