1/*
2 * Copyright (C) 2012 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 HOLDER “AS IS” AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
26 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef ShapeOutsideInfo_h
31#define ShapeOutsideInfo_h
32
33#include "core/rendering/shapes/Shape.h"
34#include "core/rendering/style/RenderStyle.h"
35#include "core/rendering/style/ShapeValue.h"
36#include "platform/geometry/FloatRect.h"
37#include "platform/geometry/LayoutSize.h"
38#include "wtf/OwnPtr.h"
39
40namespace blink {
41
42class RenderBlockFlow;
43class RenderBox;
44class FloatingObject;
45
46class ShapeOutsideDeltas FINAL {
47public:
48    ShapeOutsideDeltas()
49        : m_lineOverlapsShape(false)
50        , m_isValid(false)
51    {
52    }
53
54    ShapeOutsideDeltas(LayoutUnit leftMarginBoxDelta, LayoutUnit rightMarginBoxDelta, bool lineOverlapsShape, LayoutUnit borderBoxLineTop, LayoutUnit lineHeight)
55        : m_leftMarginBoxDelta(leftMarginBoxDelta)
56        , m_rightMarginBoxDelta(rightMarginBoxDelta)
57        , m_borderBoxLineTop(borderBoxLineTop)
58        , m_lineHeight(lineHeight)
59        , m_lineOverlapsShape(lineOverlapsShape)
60        , m_isValid(true)
61    {
62    }
63
64    bool isForLine(LayoutUnit borderBoxLineTop, LayoutUnit lineHeight)
65    {
66        return m_isValid && m_borderBoxLineTop == borderBoxLineTop && m_lineHeight == lineHeight;
67    }
68
69    bool isValid() { return m_isValid; }
70    LayoutUnit leftMarginBoxDelta() { ASSERT(m_isValid); return m_leftMarginBoxDelta; }
71    LayoutUnit rightMarginBoxDelta() { ASSERT(m_isValid); return m_rightMarginBoxDelta; }
72    bool lineOverlapsShape() { ASSERT(m_isValid); return m_lineOverlapsShape; }
73
74private:
75    LayoutUnit m_leftMarginBoxDelta;
76    LayoutUnit m_rightMarginBoxDelta;
77    LayoutUnit m_borderBoxLineTop;
78    LayoutUnit m_lineHeight;
79    bool m_lineOverlapsShape : 1;
80    bool m_isValid : 1;
81};
82
83class ShapeOutsideInfo FINAL {
84    WTF_MAKE_FAST_ALLOCATED;
85public:
86    void setReferenceBoxLogicalSize(LayoutSize);
87
88    LayoutUnit shapeLogicalTop() const { return computedShape().shapeMarginLogicalBoundingBox().y() + logicalTopOffset(); }
89    LayoutUnit shapeLogicalBottom() const { return computedShape().shapeMarginLogicalBoundingBox().maxY() + logicalTopOffset(); }
90    LayoutUnit shapeLogicalLeft() const { return computedShape().shapeMarginLogicalBoundingBox().x() + logicalLeftOffset(); }
91    LayoutUnit shapeLogicalRight() const { return computedShape().shapeMarginLogicalBoundingBox().maxX() + logicalLeftOffset(); }
92    LayoutUnit shapeLogicalWidth() const { return computedShape().shapeMarginLogicalBoundingBox().width(); }
93    LayoutUnit shapeLogicalHeight() const { return computedShape().shapeMarginLogicalBoundingBox().height(); }
94
95    static PassOwnPtr<ShapeOutsideInfo> createInfo(const RenderBox& renderer) { return adoptPtr(new ShapeOutsideInfo(renderer)); }
96    static bool isEnabledFor(const RenderBox&);
97
98    ShapeOutsideDeltas computeDeltasForContainingBlockLine(const RenderBlockFlow&, const FloatingObject&, LayoutUnit lineTop, LayoutUnit lineHeight);
99
100    static ShapeOutsideInfo& ensureInfo(const RenderBox& key)
101    {
102        InfoMap& infoMap = ShapeOutsideInfo::infoMap();
103        if (ShapeOutsideInfo* info = infoMap.get(&key))
104            return *info;
105        InfoMap::AddResult result = infoMap.add(&key, ShapeOutsideInfo::createInfo(key));
106        return *result.storedValue->value;
107    }
108    static void removeInfo(const RenderBox& key) { infoMap().remove(&key); }
109    static ShapeOutsideInfo* info(const RenderBox& key) { return infoMap().get(&key); }
110
111    void markShapeAsDirty() { m_shape.clear(); }
112    bool isShapeDirty() { return !m_shape.get(); }
113    LayoutSize shapeSize() const { return m_referenceBoxLogicalSize; }
114    bool isComputingShape() const { return m_isComputingShape; }
115
116    LayoutRect computedShapePhysicalBoundingBox() const;
117    FloatPoint shapeToRendererPoint(FloatPoint) const;
118    FloatSize shapeToRendererSize(FloatSize) const;
119    const Shape& computedShape() const;
120
121protected:
122    ShapeOutsideInfo(const RenderBox& renderer)
123        : m_renderer(renderer)
124        , m_isComputingShape(false)
125    { }
126
127private:
128    PassOwnPtr<Shape> createShapeForImage(StyleImage*, float shapeImageThreshold, WritingMode, float margin) const;
129
130    LayoutUnit logicalTopOffset() const;
131    LayoutUnit logicalLeftOffset() const;
132
133    typedef HashMap<const RenderBox*, OwnPtr<ShapeOutsideInfo> > InfoMap;
134    static InfoMap& infoMap()
135    {
136        DEFINE_STATIC_LOCAL(InfoMap, staticInfoMap, ());
137        return staticInfoMap;
138    }
139
140    const RenderBox& m_renderer;
141    mutable OwnPtr<Shape> m_shape;
142    LayoutSize m_referenceBoxLogicalSize;
143    ShapeOutsideDeltas m_shapeOutsideDeltas;
144    mutable bool m_isComputingShape;
145};
146
147}
148#endif
149