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
113