1/*
2 * Copyright (C) 2003, 2006, 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2010 Google Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1.  Redistributions of source code must retain the above copyright
10 *     notice, this list of conditions and the following disclaimer.
11 * 2.  Redistributions in binary form must reproduce the above copyright
12 *     notice, this list of conditions and the following disclaimer in the
13 *     documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
22 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef RoundedRect_h
28#define RoundedRect_h
29
30#include "platform/geometry/FloatQuad.h"
31#include "platform/geometry/IntRect.h"
32
33namespace blink {
34
35// This class is used to represent rectangles with rounded corners. It is only
36// used for painting. It uses integer units because using layout units leads to
37// blurry rounded corners.
38class PLATFORM_EXPORT RoundedRect {
39public:
40    class PLATFORM_EXPORT Radii {
41    public:
42        Radii() { }
43        Radii(const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight)
44            : m_topLeft(topLeft)
45            , m_topRight(topRight)
46            , m_bottomLeft(bottomLeft)
47            , m_bottomRight(bottomRight)
48        {
49        }
50
51        void setTopLeft(const IntSize& size) { m_topLeft = size; }
52        void setTopRight(const IntSize& size) { m_topRight = size; }
53        void setBottomLeft(const IntSize& size) { m_bottomLeft = size; }
54        void setBottomRight(const IntSize& size) { m_bottomRight = size; }
55        const IntSize& topLeft() const { return m_topLeft; }
56        const IntSize& topRight() const { return m_topRight; }
57        const IntSize& bottomLeft() const { return m_bottomLeft; }
58        const IntSize& bottomRight() const { return m_bottomRight; }
59
60        bool isZero() const;
61
62        void includeLogicalEdges(const Radii& edges, bool isHorizontal, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
63        void excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge);
64
65        void scale(float factor);
66        void expand(int topWidth, int bottomWidth, int leftWidth, int rightWidth);
67        void expand(int size) { expand(size, size, size, size); }
68        void shrink(int topWidth, int bottomWidth, int leftWidth, int rightWidth) { expand(-topWidth, -bottomWidth, -leftWidth, -rightWidth); }
69        void shrink(int size) { shrink(size, size, size, size); }
70
71    private:
72        IntSize m_topLeft;
73        IntSize m_topRight;
74        IntSize m_bottomLeft;
75        IntSize m_bottomRight;
76    };
77
78    explicit RoundedRect(const IntRect&, const Radii& = Radii());
79    RoundedRect(int x, int y, int width, int height);
80    RoundedRect(const IntRect&, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight);
81
82    const IntRect& rect() const { return m_rect; }
83    const Radii& radii() const { return m_radii; }
84    bool isRounded() const { return !m_radii.isZero(); }
85    bool isEmpty() const { return m_rect.isEmpty(); }
86
87    // Returns a quickly computed rect enclosed by the rounded rect.
88    IntRect radiusCenterRect() const;
89
90    void setRect(const IntRect& rect) { m_rect = rect; }
91    void setRadii(const Radii& radii) { m_radii = radii; }
92
93    void move(const IntSize& size) { m_rect.move(size); }
94    void inflate(int size) { m_rect.inflate(size);  }
95    void inflateWithRadii(int size);
96    void expandRadii(int size) { m_radii.expand(size); }
97    void shrinkRadii(int size) { m_radii.shrink(size); }
98
99    void includeLogicalEdges(const Radii& edges, bool isHorizontal, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
100    void excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge);
101
102    bool isRenderable() const;
103    void adjustRadii();
104
105    // Tests whether the quad intersects any part of this rounded rectangle.
106    // This only works for convex quads.
107    bool intersectsQuad(const FloatQuad&) const;
108
109private:
110    IntRect m_rect;
111    Radii m_radii;
112};
113
114inline bool operator==(const RoundedRect::Radii& a, const RoundedRect::Radii& b)
115{
116    return a.topLeft() == b.topLeft() && a.topRight() == b.topRight() && a.bottomLeft() == b.bottomLeft() && a.bottomRight() == b.bottomRight();
117}
118
119inline bool operator!=(const RoundedRect::Radii& a, const RoundedRect::Radii& b)
120{
121    return !(a == b);
122}
123
124inline bool operator==(const RoundedRect& a, const RoundedRect& b)
125{
126    return a.rect() == b.rect() && a.radii() == b.radii();
127}
128
129
130} // namespace blink
131
132#endif // RoundedRect_h
133