1/*
2 * Copyright (C) 2013 Adobe Systems Incorporated. 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 *
8 * 1. Redistributions of source code must retain the above
9 *    copyright notice, this list of conditions and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above
12 *    copyright notice, this list of conditions and the following
13 *    disclaimer in the documentation and/or other materials
14 *    provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#ifndef RasterShape_h
31#define RasterShape_h
32
33#include "FloatRect.h"
34#include "Shape.h"
35#include "ShapeInterval.h"
36#include <wtf/Assertions.h>
37#include <wtf/Vector.h>
38
39namespace WebCore {
40
41class RasterShapeIntervals {
42public:
43    RasterShapeIntervals(unsigned size, int offset = 0)
44        : m_offset(offset)
45    {
46        m_intervals.resize(clampTo<int>(size));
47    }
48
49    void initializeBounds();
50    const IntRect& bounds() const { return m_bounds; }
51    bool isEmpty() const { return m_bounds.isEmpty(); }
52
53    IntShapeInterval& intervalAt(int y)
54    {
55        ASSERT(y + m_offset >= 0 && static_cast<unsigned>(y + m_offset) < m_intervals.size());
56        return m_intervals[y + m_offset];
57    }
58
59    const IntShapeInterval& intervalAt(int y) const
60    {
61        ASSERT(y + m_offset >= 0 && static_cast<unsigned>(y + m_offset) < m_intervals.size());
62        return m_intervals[y + m_offset];
63    }
64
65    std::unique_ptr<RasterShapeIntervals> computeShapeMarginIntervals(int shapeMargin) const;
66    void buildBoundsPath(Path&) const;
67
68private:
69    int size() const { return m_intervals.size(); }
70    int offset() const { return m_offset; }
71    int minY() const { return -m_offset; }
72    int maxY() const { return -m_offset + m_intervals.size(); }
73
74    IntRect m_bounds;
75    Vector<IntShapeInterval> m_intervals;
76    int m_offset;
77};
78
79class RasterShape : public Shape {
80    WTF_MAKE_NONCOPYABLE(RasterShape);
81public:
82    RasterShape(std::unique_ptr<RasterShapeIntervals> intervals, const IntSize& marginRectSize)
83        : m_intervals(WTF::move(intervals))
84        , m_marginRectSize(marginRectSize)
85    {
86        m_intervals->initializeBounds();
87    }
88
89    virtual LayoutRect shapeMarginLogicalBoundingBox() const override { return static_cast<LayoutRect>(marginIntervals().bounds()); }
90    virtual bool isEmpty() const override { return m_intervals->isEmpty(); }
91    virtual void getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const override;
92
93    virtual void buildDisplayPaths(DisplayPaths& paths) const override
94    {
95        m_intervals->buildBoundsPath(paths.shape);
96        if (shapeMargin())
97            marginIntervals().buildBoundsPath(paths.marginShape);
98    }
99
100private:
101    const RasterShapeIntervals& marginIntervals() const;
102
103    std::unique_ptr<RasterShapeIntervals> m_intervals;
104    mutable std::unique_ptr<RasterShapeIntervals> m_marginIntervals;
105    IntSize m_marginRectSize;
106};
107
108} // namespace WebCore
109
110#endif // RasterShape_h
111