1/*
2 * Copyright (C) 2003, 2006, 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2010 Google Inc. All rights reserved.
4 * Copyright (C) 2013 Xidorn Quan (quanxunzhen@gmail.com)
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1.  Redistributions of source code must retain the above copyright
11 *     notice, this list of conditions and the following disclaimer.
12 * 2.  Redistributions in binary form must reproduce the above copyright
13 *     notice, this list of conditions and the following disclaimer in the
14 *     documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "config.h"
29#include "platform/geometry/RoundedRect.h"
30
31#include "wtf/Assertions.h"
32#include <algorithm>
33
34using namespace std;
35
36namespace WebCore {
37
38bool RoundedRect::Radii::isZero() const
39{
40    return m_topLeft.isZero() && m_topRight.isZero() && m_bottomLeft.isZero() && m_bottomRight.isZero();
41}
42
43void RoundedRect::Radii::scale(float factor)
44{
45    if (factor == 1)
46        return;
47
48    // If either radius on a corner becomes zero, reset both radii on that corner.
49    m_topLeft.scale(factor);
50    if (!m_topLeft.width() || !m_topLeft.height())
51        m_topLeft = IntSize();
52    m_topRight.scale(factor);
53    if (!m_topRight.width() || !m_topRight.height())
54        m_topRight = IntSize();
55    m_bottomLeft.scale(factor);
56    if (!m_bottomLeft.width() || !m_bottomLeft.height())
57        m_bottomLeft = IntSize();
58    m_bottomRight.scale(factor);
59    if (!m_bottomRight.width() || !m_bottomRight.height())
60        m_bottomRight = IntSize();
61
62}
63
64void RoundedRect::Radii::expand(int topWidth, int bottomWidth, int leftWidth, int rightWidth)
65{
66    if (m_topLeft.width() > 0 && m_topLeft.height() > 0) {
67        m_topLeft.setWidth(max<int>(0, m_topLeft.width() + leftWidth));
68        m_topLeft.setHeight(max<int>(0, m_topLeft.height() + topWidth));
69    }
70    if (m_topRight.width() > 0 && m_topRight.height() > 0) {
71        m_topRight.setWidth(max<int>(0, m_topRight.width() + rightWidth));
72        m_topRight.setHeight(max<int>(0, m_topRight.height() + topWidth));
73    }
74    if (m_bottomLeft.width() > 0 && m_bottomLeft.height() > 0) {
75        m_bottomLeft.setWidth(max<int>(0, m_bottomLeft.width() + leftWidth));
76        m_bottomLeft.setHeight(max<int>(0, m_bottomLeft.height() + bottomWidth));
77    }
78    if (m_bottomRight.width() > 0 && m_bottomRight.height() > 0) {
79        m_bottomRight.setWidth(max<int>(0, m_bottomRight.width() + rightWidth));
80        m_bottomRight.setHeight(max<int>(0, m_bottomRight.height() + bottomWidth));
81    }
82}
83
84void RoundedRect::inflateWithRadii(int size)
85{
86    IntRect old = m_rect;
87
88    m_rect.inflate(size);
89    // Considering the inflation factor of shorter size to scale the radii seems appropriate here
90    float factor;
91    if (m_rect.width() < m_rect.height())
92        factor = old.width() ? (float)m_rect.width() / old.width() : int(0);
93    else
94        factor = old.height() ? (float)m_rect.height() / old.height() : int(0);
95
96    m_radii.scale(factor);
97}
98
99void RoundedRect::Radii::includeLogicalEdges(const RoundedRect::Radii& edges, bool isHorizontal, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
100{
101    if (includeLogicalLeftEdge) {
102        if (isHorizontal)
103            m_bottomLeft = edges.bottomLeft();
104        else
105            m_topRight = edges.topRight();
106        m_topLeft = edges.topLeft();
107    }
108
109    if (includeLogicalRightEdge) {
110        if (isHorizontal)
111            m_topRight = edges.topRight();
112        else
113            m_bottomLeft = edges.bottomLeft();
114        m_bottomRight = edges.bottomRight();
115    }
116}
117
118void RoundedRect::Radii::excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge)
119{
120    if (excludeLogicalLeftEdge) {
121        if (isHorizontal)
122            m_bottomLeft = IntSize();
123        else
124            m_topRight = IntSize();
125        m_topLeft = IntSize();
126    }
127
128    if (excludeLogicalRightEdge) {
129        if (isHorizontal)
130            m_topRight = IntSize();
131        else
132            m_bottomLeft = IntSize();
133        m_bottomRight = IntSize();
134    }
135}
136
137RoundedRect::RoundedRect(int x, int y, int width, int height)
138    : m_rect(x, y, width, height)
139{
140}
141
142RoundedRect::RoundedRect(const IntRect& rect, const Radii& radii)
143    : m_rect(rect)
144    , m_radii(radii)
145{
146}
147
148RoundedRect::RoundedRect(const IntRect& rect, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight)
149    : m_rect(rect)
150    , m_radii(topLeft, topRight, bottomLeft, bottomRight)
151{
152}
153
154IntRect RoundedRect::radiusCenterRect() const
155{
156    ASSERT(isRenderable());
157    int minX = m_rect.x() + max(m_radii.topLeft().width(), m_radii.bottomLeft().width());
158    int minY = m_rect.y() + max(m_radii.topLeft().height(), m_radii.topRight().height());
159    int maxX = m_rect.maxX() - max(m_radii.topRight().width(), m_radii.bottomRight().width());
160    int maxY = m_rect.maxY() - max(m_radii.bottomLeft().height(), m_radii.bottomRight().height());
161    return IntRect(minX, minY, maxX - minX, maxY - minY);
162}
163
164void RoundedRect::includeLogicalEdges(const Radii& edges, bool isHorizontal, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
165{
166    m_radii.includeLogicalEdges(edges, isHorizontal, includeLogicalLeftEdge, includeLogicalRightEdge);
167}
168
169void RoundedRect::excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge)
170{
171    m_radii.excludeLogicalEdges(isHorizontal, excludeLogicalLeftEdge, excludeLogicalRightEdge);
172}
173
174bool RoundedRect::isRenderable() const
175{
176    return m_radii.topLeft().width() + m_radii.topRight().width() <= m_rect.width()
177        && m_radii.bottomLeft().width() + m_radii.bottomRight().width() <= m_rect.width()
178        && m_radii.topLeft().height() + m_radii.bottomLeft().height() <= m_rect.height()
179        && m_radii.topRight().height() + m_radii.bottomRight().height() <= m_rect.height();
180}
181
182void RoundedRect::adjustRadii()
183{
184    int maxRadiusWidth = std::max(m_radii.topLeft().width() + m_radii.topRight().width(), m_radii.bottomLeft().width() + m_radii.bottomRight().width());
185    int maxRadiusHeight = std::max(m_radii.topLeft().height() + m_radii.bottomLeft().height(), m_radii.topRight().height() + m_radii.bottomRight().height());
186
187    if (maxRadiusWidth <= 0 || maxRadiusHeight <= 0) {
188        m_radii.scale(0.0f);
189        return;
190    }
191    float widthRatio = static_cast<float>(m_rect.width()) / maxRadiusWidth;
192    float heightRatio = static_cast<float>(m_rect.height()) / maxRadiusHeight;
193    m_radii.scale(widthRatio < heightRatio ? widthRatio : heightRatio);
194}
195
196bool RoundedRect::intersectsQuad(const FloatQuad& quad) const
197{
198    FloatRect rect(m_rect);
199    if (!quad.intersectsRect(rect))
200        return false;
201
202    const IntSize& topLeft = m_radii.topLeft();
203    if (!topLeft.isEmpty()) {
204        FloatRect rect(m_rect.x(), m_rect.y(), topLeft.width(), topLeft.height());
205        if (quad.intersectsRect(rect)) {
206            FloatPoint center(m_rect.x() + topLeft.width(), m_rect.y() + topLeft.height());
207            FloatSize size(topLeft.width(), topLeft.height());
208            if (!quad.intersectsEllipse(center, size))
209                return false;
210        }
211    }
212
213    const IntSize& topRight = m_radii.topRight();
214    if (!topRight.isEmpty()) {
215        FloatRect rect(m_rect.maxX() - topRight.width(), m_rect.y(), topRight.width(), topRight.height());
216        if (quad.intersectsRect(rect)) {
217            FloatPoint center(m_rect.maxX() - topRight.width(), m_rect.y() + topRight.height());
218            FloatSize size(topRight.width(), topRight.height());
219            if (!quad.intersectsEllipse(center, size))
220                return false;
221        }
222    }
223
224    const IntSize& bottomLeft = m_radii.bottomLeft();
225    if (!bottomLeft.isEmpty()) {
226        FloatRect rect(m_rect.x(), m_rect.maxY() - bottomLeft.height(), bottomLeft.width(), bottomLeft.height());
227        if (quad.intersectsRect(rect)) {
228            FloatPoint center(m_rect.x() + bottomLeft.width(), m_rect.maxY() - bottomLeft.height());
229            FloatSize size(bottomLeft.width(), bottomLeft.height());
230            if (!quad.intersectsEllipse(center, size))
231                return false;
232        }
233    }
234
235    const IntSize& bottomRight = m_radii.bottomRight();
236    if (!bottomRight.isEmpty()) {
237        FloatRect rect(m_rect.maxX() - bottomRight.width(), m_rect.maxY() - bottomRight.height(), bottomRight.width(), bottomRight.height());
238        if (quad.intersectsRect(rect)) {
239            FloatPoint center(m_rect.maxX() - bottomRight.width(), m_rect.maxY() - bottomRight.height());
240            FloatSize size(bottomRight.width(), bottomRight.height());
241            if (!quad.intersectsEllipse(center, size))
242                return false;
243        }
244    }
245
246    return true;
247}
248
249} // namespace WebCore
250