Source/core/rendering/shapes/RasterShape.h

/*
 * Copyright (C) 2013 Adobe Systems Incorporated. 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE
 * COPYRIGHT HOLDER 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,
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 */

#ifndef RasterShape_h
#define RasterShape_h

#include "core/platform/graphics/FloatRect.h"
#include "core/platform/graphics/Region.h"
#include "core/rendering/shapes/Shape.h"
#include "wtf/Assertions.h"
#include "wtf/Vector.h"

namespace WebCore {

class RasterShapeIntervals {
public:
    RasterShapeIntervals() { }

    IntRect bounds() const;
    bool isEmpty() const  { return m_region.isEmpty(); }
    void addInterval(int y, int x1, int x2);
    void getIncludedIntervals(int y1, int y2, SegmentList&) const;
    void getExcludedIntervals(int y1, int y2, SegmentList&) const;
    bool firstIncludedIntervalY(int minY, const IntSize& minIntervalSize, LayoutUnit&) const;

private:
    Region m_region;
    mutable OwnPtr<IntRect> m_bounds; // Cached value of m_region.bounds().
};

class RasterShape : public Shape {
    WTF_MAKE_NONCOPYABLE(RasterShape);
public:
    RasterShape(PassOwnPtr<RasterShapeIntervals> intervals)
        : Shape()
        , m_intervals(intervals)
    {
    }

    virtual LayoutRect shapeMarginLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(marginIntervals().bounds()); }
    virtual LayoutRect shapePaddingLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(paddingIntervals().bounds()); }
    virtual bool isEmpty() const OVERRIDE { return m_intervals->isEmpty(); }
    virtual void getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
    virtual void getIncludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
    virtual bool firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const LayoutSize& minLogicalIntervalSize, LayoutUnit&) const OVERRIDE;

private:
    const RasterShapeIntervals& marginIntervals() const;
    const RasterShapeIntervals& paddingIntervals() const;

    OwnPtr<RasterShapeIntervals> m_intervals;
};

} // namespace WebCore

#endif // RasterShape_h