third_party/WebKit/Source/modules/canvas2d/CanvasStyle.h

/*
 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 *
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef CanvasStyle_h
#define CanvasStyle_h

#include "platform/graphics/Color.h"
#include "platform/heap/Handle.h"
#include "wtf/Assertions.h"
#include "wtf/RefCounted.h"
#include "wtf/text/WTFString.h"

class SkPaint;
class SkShader;

namespace blink {

class CanvasGradient;
class CanvasPattern;
class HTMLCanvasElement;

class CanvasStyle final : public GarbageCollected<CanvasStyle> {
public:
    static CanvasStyle* createFromRGBA(RGBA32 rgba) { return new CanvasStyle(rgba); }
    static CanvasStyle* createFromGradient(CanvasGradient*);
    static CanvasStyle* createFromPattern(CanvasPattern*);

    String color() const { ASSERT(m_type == ColorRGBA); return Color(m_rgba).serialized(); }
    CanvasGradient* canvasGradient() const { return m_gradient.get(); }
    CanvasPattern* canvasPattern() const { return m_pattern; }

    void applyToPaint(SkPaint&) const;
    RGBA32 paintColor() const;

    bool isEquivalentRGBA(RGBA32 rgba) const { return m_type == ColorRGBA && m_rgba == rgba; }

    DECLARE_TRACE();

private:
    enum Type { ColorRGBA, Gradient, ImagePattern };

    CanvasStyle(RGBA32);
    CanvasStyle(CanvasGradient*);
    CanvasStyle(CanvasPattern*);

    Type m_type;
    RGBA32 m_rgba;

    Member<CanvasGradient> m_gradient;
    Member<CanvasPattern> m_pattern;
};

bool parseColorOrCurrentColor(Color& parsedColor, const String& colorString, HTMLCanvasElement*);

} // namespace blink

#endif