/*

 * Copyright (C) 2008 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#ifndef CSSGradientValue_h

#define CSSGradientValue_h

#include "CSSImageGeneratorValue.h"

#include "CSSPrimitiveValue.h"

#include <wtf/RefPtr.h>

#include <wtf/Vector.h>

namespace WebCore {

class FloatPoint;

class Gradient;

enum CSSGradientType { CSSLinearGradient, CSSRadialGradient };

struct CSSGradientColorStop {

    CSSGradientColorStop()

        : m_stop(0)

    {

    }

    float m_stop;

    RefPtr<CSSPrimitiveValue> m_color;

};

class CSSGradientValue : public CSSImageGeneratorValue {

public:

    static PassRefPtr<CSSGradientValue> create()

    {

        return adoptRef(new CSSGradientValue);

    }

    virtual String cssText() const;

    virtual Image* image(RenderObject*, const IntSize&);

    CSSGradientType type() const { return m_type; }

    void setType(CSSGradientType type) { m_type = type; }

    void setFirstX(PassRefPtr<CSSPrimitiveValue> val) { m_firstX = val; }

    void setFirstY(PassRefPtr<CSSPrimitiveValue> val) { m_firstY = val; }

    void setSecondX(PassRefPtr<CSSPrimitiveValue> val) { m_secondX = val; }

    void setSecondY(PassRefPtr<CSSPrimitiveValue> val) { m_secondY = val; }

    void setFirstRadius(PassRefPtr<CSSPrimitiveValue> val) { m_firstRadius = val; }

    void setSecondRadius(PassRefPtr<CSSPrimitiveValue> val) { m_secondRadius = val; }

    void addStop(const CSSGradientColorStop& stop) { m_stops.append(stop); }

    void sortStopsIfNeeded();

private:

    CSSGradientValue()

        : m_type(CSSLinearGradient)

        , m_stopsSorted(false)

    {

    }

    // Create the gradient for a given size.

    PassRefPtr<Gradient> createGradient(RenderObject*, const IntSize&);

    // Resolve points/radii to front end values.

    FloatPoint resolvePoint(CSSPrimitiveValue*, CSSPrimitiveValue*, const IntSize&, float zoomFactor);

    float resolveRadius(CSSPrimitiveValue*, float zoomFactor);

    // Type

    CSSGradientType m_type;

    // Points

    RefPtr<CSSPrimitiveValue> m_firstX;

    RefPtr<CSSPrimitiveValue> m_firstY;

    RefPtr<CSSPrimitiveValue> m_secondX;

    RefPtr<CSSPrimitiveValue> m_secondY;

    // Radii (for radial gradients only)

    RefPtr<CSSPrimitiveValue> m_firstRadius;

    RefPtr<CSSPrimitiveValue> m_secondRadius;

    // Stops

    Vector<CSSGradientColorStop> m_stops;

    bool m_stopsSorted;

};

} // namespace WebCore

#endif // CSSGradientValue_h