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
34namespace blink {
35
36bool RoundedRect::Radii::isZero() const
37{
38    return m_topLeft.isZero() && m_topRight.isZero() && m_bottomLeft.isZero() && m_bottomRight.isZero();
39}
40
41void RoundedRect::Radii::scale(float factor)
42{
43    if (factor == 1)
44        return;
45
46    // If either radius on a corner becomes zero, reset both radii on that corner.
47    m_topLeft.scale(factor);
48    if (!m_topLeft.width() || !m_topLeft.height())
49        m_topLeft = IntSize();
50    m_topRight.scale(factor);
51    if (!m_topRight.width() || !m_topRight.height())
52        m_topRight = IntSize();
53    m_bottomLeft.scale(factor);
54    if (!m_bottomLeft.width() || !m_bottomLeft.height())
55        m_bottomLeft = IntSize();
56    m_bottomRight.scale(factor);
57    if (!m_bottomRight.width() || !m_bottomRight.height())
58        m_bottomRight = IntSize();
59
60}
61
62void RoundedRect::Radii::expand(int topWidth, int bottomWidth, int leftWidth, int rightWidth)
63{
64    if (m_topLeft.width() > 0 && m_topLeft.height() > 0) {
65        m_topLeft.setWidth(std::max<int>(0, m_topLeft.width() + leftWidth));
66        m_topLeft.setHeight(std::max<int>(0, m_topLeft.height() + topWidth));
67    }
68    if (m_topRight.width() > 0 && m_topRight.height() > 0) {
69        m_topRight.setWidth(std::max<int>(0, m_topRight.width() + rightWidth));
70        m_topRight.setHeight(std::max<int>(0, m_topRight.height() + topWidth));
71    }
72    if (m_bottomLeft.width() > 0 && m_bottomLeft.height() > 0) {
73        m_bottomLeft.setWidth(std::max<int>(0, m_bottomLeft.width() + leftWidth));
74        m_bottomLeft.setHeight(std::max<int>(0, m_bottomLeft.height() + bottomWidth));
75    }
76    if (m_bottomRight.width() > 0 && m_bottomRight.height() > 0) {
77        m_bottomRight.setWidth(std::max<int>(0, m_bottomRight.width() + rightWidth));
78        m_bottomRight.setHeight(std::max<int>(0, m_bottomRight.height() + bottomWidth));
79    }
80}
81
82void RoundedRect::inflateWithRadii(int size)
83{
84    IntRect old = m_rect;
85
86    m_rect.inflate(size);
87    // Considering the inflation factor of shorter size to scale the radii seems appropriate here
88    float factor;
89    if (m_rect.width() < m_rect.height())
90        factor = old.width() ? (float)m_rect.width() / old.width() : int(0);
91    else
92        factor = old.height() ? (float)m_rect.height() / old.height() : int(0);
93
94    m_radii.scale(factor);
95}
96
97void RoundedRect::Radii::includeLogicalEdges(const RoundedRect::Radii& edges, bool isHorizontal, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
98{
99    if (includeLogicalLeftEdge) {
100        if (isHorizontal)
101            m_bottomLeft = edges.bottomLeft();
102        else
103            m_topRight = edges.topRight();
104        m_topLeft = edges.topLeft();
105    }
106
107    if (includeLogicalRightEdge) {
108        if (isHorizontal)
109            m_topRight = edges.topRight();
110        else
111            m_bottomLeft = edges.bottomLeft();
112        m_bottomRight = edges.bottomRight();
113    }
114}
115
116void RoundedRect::Radii::excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge)
117{
118    if (excludeLogicalLeftEdge) {
119        if (isHorizontal)
120            m_bottomLeft = IntSize();
121        else
122            m_topRight = IntSize();
123        m_topLeft = IntSize();
124    }
125
126    if (excludeLogicalRightEdge) {
127        if (isHorizontal)
128            m_topRight = IntSize();
129        else
130            m_bottomLeft = IntSize();
131        m_bottomRight = IntSize();
132    }
133}
134
135RoundedRect::RoundedRect(int x, int y, int width, int height)
136    : m_rect(x, y, width, height)
137{
138}
139
140RoundedRect::RoundedRect(const IntRect& rect, const Radii& radii)
141    : m_rect(rect)
142    , m_radii(radii)
143{
144}
145
146RoundedRect::RoundedRect(const IntRect& rect, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight)
147    : m_rect(rect)
148    , m_radii(topLeft, topRight, bottomLeft, bottomRight)
149{
150}
151
152IntRect RoundedRect::radiusCenterRect() const
153{
154    ASSERT(isRenderable());
155    int minX = m_rect.x() + std::max(m_radii.topLeft().width(), m_radii.bottomLeft().width());
156    int minY = m_rect.y() + std::max(m_radii.topLeft().height(), m_radii.topRight().height());
157    int maxX = m_rect.maxX() - std::max(m_radii.topRight().width(), m_radii.bottomRight().width());
158    int maxY = m_rect.maxY() - std::max(m_radii.bottomLeft().height(), m_radii.bottomRight().height());
159    return IntRect(minX, minY, maxX - minX, maxY - minY);
160}
161
162void RoundedRect::includeLogicalEdges(const Radii& edges, bool isHorizontal, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
163{
164    m_radii.includeLogicalEdges(edges, isHorizontal, includeLogicalLeftEdge, includeLogicalRightEdge);
165}
166
167void RoundedRect::excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge)
168{
169    m_radii.excludeLogicalEdges(isHorizontal, excludeLogicalLeftEdge, excludeLogicalRightEdge);
170}
171
172bool RoundedRect::isRenderable() const
173{
174    return m_radii.topLeft().width() + m_radii.topRight().width() <= m_rect.width()
175        && m_radii.bottomLeft().width() + m_radii.bottomRight().width() <= m_rect.width()
176        && m_radii.topLeft().height() + m_radii.bottomLeft().height() <= m_rect.height()
177        && m_radii.topRight().height() + m_radii.bottomRight().height() <= m_rect.height();
178}
179
180void RoundedRect::adjustRadii()
181{
182    int maxRadiusWidth = std::max(m_radii.topLeft().width() + m_radii.topRight().width(), m_radii.bottomLeft().width() + m_radii.bottomRight().width());
183    int maxRadiusHeight = std::max(m_radii.topLeft().height() + m_radii.bottomLeft().height(), m_radii.topRight().height() + m_radii.bottomRight().height());
184
185    if (maxRadiusWidth <= 0 || maxRadiusHeight <= 0) {
186        m_radii.scale(0.0f);
187        return;
188    }
189    float widthRatio = static_cast<float>(m_rect.width()) / maxRadiusWidth;
190    float heightRatio = static_cast<float>(m_rect.height()) / maxRadiusHeight;
191    m_radii.scale(widthRatio < heightRatio ? widthRatio : heightRatio);
192}
193
194bool RoundedRect::intersectsQuad(const FloatQuad& quad) const
195{
196    FloatRect rect(m_rect);
197    if (!quad.intersectsRect(rect))
198        return false;
199
200    const IntSize& topLeft = m_radii.topLeft();
201    if (!topLeft.isEmpty()) {
202        FloatRect rect(m_rect.x(), m_rect.y(), topLeft.width(), topLeft.height());
203        if (quad.intersectsRect(rect)) {
204            FloatPoint center(m_rect.x() + topLeft.width(), m_rect.y() + topLeft.height());
205            FloatSize size(topLeft.width(), topLeft.height());
206            if (!quad.intersectsEllipse(center, size))
207                return false;
208        }
209    }
210
211    const IntSize& topRight = m_radii.topRight();
212    if (!topRight.isEmpty()) {
213        FloatRect rect(m_rect.maxX() - topRight.width(), m_rect.y(), topRight.width(), topRight.height());
214        if (quad.intersectsRect(rect)) {
215            FloatPoint center(m_rect.maxX() - topRight.width(), m_rect.y() + topRight.height());
216            FloatSize size(topRight.width(), topRight.height());
217            if (!quad.intersectsEllipse(center, size))
218                return false;
219        }
220    }
221
222    const IntSize& bottomLeft = m_radii.bottomLeft();
223    if (!bottomLeft.isEmpty()) {
224        FloatRect rect(m_rect.x(), m_rect.maxY() - bottomLeft.height(), bottomLeft.width(), bottomLeft.height());
225        if (quad.intersectsRect(rect)) {
226            FloatPoint center(m_rect.x() + bottomLeft.width(), m_rect.maxY() - bottomLeft.height());
227            FloatSize size(bottomLeft.width(), bottomLeft.height());
228            if (!quad.intersectsEllipse(center, size))
229                return false;
230        }
231    }
232
233    const IntSize& bottomRight = m_radii.bottomRight();
234    if (!bottomRight.isEmpty()) {
235        FloatRect rect(m_rect.maxX() - bottomRight.width(), m_rect.maxY() - bottomRight.height(), bottomRight.width(), bottomRight.height());
236        if (quad.intersectsRect(rect)) {
237            FloatPoint center(m_rect.maxX() - bottomRight.width(), m_rect.maxY() - bottomRight.height());
238            FloatSize size(bottomRight.width(), bottomRight.height());
239            if (!quad.intersectsEllipse(center, size))
240                return false;
241        }
242    }
243
244    return true;
245}
246
247} // namespace blink
248