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 #include "config.h"
31 #include "platform/geometry/FloatRoundedRect.h"
32
33 #include <algorithm>
34
35 namespace blink {
36
FloatRoundedRect(float x,float y,float width,float height)37 FloatRoundedRect::FloatRoundedRect(float x, float y, float width, float height)
38 : m_rect(x, y, width, height)
39 {
40 }
41
FloatRoundedRect(const FloatRect & rect,const Radii & radii)42 FloatRoundedRect::FloatRoundedRect(const FloatRect& rect, const Radii& radii)
43 : m_rect(rect)
44 , m_radii(radii)
45 {
46 }
47
FloatRoundedRect(const FloatRect & rect,const FloatSize & topLeft,const FloatSize & topRight,const FloatSize & bottomLeft,const FloatSize & bottomRight)48 FloatRoundedRect::FloatRoundedRect(const FloatRect& rect, const FloatSize& topLeft, const FloatSize& topRight, const FloatSize& bottomLeft, const FloatSize& bottomRight)
49 : m_rect(rect)
50 , m_radii(topLeft, topRight, bottomLeft, bottomRight)
51 {
52 }
53
isZero() const54 bool FloatRoundedRect::Radii::isZero() const
55 {
56 return m_topLeft.isZero() && m_topRight.isZero() && m_bottomLeft.isZero() && m_bottomRight.isZero();
57 }
58
scale(float factor)59 void FloatRoundedRect::Radii::scale(float factor)
60 {
61 if (factor == 1)
62 return;
63
64 // If either radius on a corner becomes zero, reset both radii on that corner.
65 m_topLeft.scale(factor);
66 if (!m_topLeft.width() || !m_topLeft.height())
67 m_topLeft = FloatSize();
68 m_topRight.scale(factor);
69 if (!m_topRight.width() || !m_topRight.height())
70 m_topRight = FloatSize();
71 m_bottomLeft.scale(factor);
72 if (!m_bottomLeft.width() || !m_bottomLeft.height())
73 m_bottomLeft = FloatSize();
74 m_bottomRight.scale(factor);
75 if (!m_bottomRight.width() || !m_bottomRight.height())
76 m_bottomRight = FloatSize();
77
78 }
79
expand(float topWidth,float bottomWidth,float leftWidth,float rightWidth)80 void FloatRoundedRect::Radii::expand(float topWidth, float bottomWidth, float leftWidth, float rightWidth)
81 {
82 if (m_topLeft.width() > 0 && m_topLeft.height() > 0) {
83 m_topLeft.setWidth(std::max<float>(0, m_topLeft.width() + leftWidth));
84 m_topLeft.setHeight(std::max<float>(0, m_topLeft.height() + topWidth));
85 }
86 if (m_topRight.width() > 0 && m_topRight.height() > 0) {
87 m_topRight.setWidth(std::max<float>(0, m_topRight.width() + rightWidth));
88 m_topRight.setHeight(std::max<float>(0, m_topRight.height() + topWidth));
89 }
90 if (m_bottomLeft.width() > 0 && m_bottomLeft.height() > 0) {
91 m_bottomLeft.setWidth(std::max<float>(0, m_bottomLeft.width() + leftWidth));
92 m_bottomLeft.setHeight(std::max<float>(0, m_bottomLeft.height() + bottomWidth));
93 }
94 if (m_bottomRight.width() > 0 && m_bottomRight.height() > 0) {
95 m_bottomRight.setWidth(std::max<float>(0, m_bottomRight.width() + rightWidth));
96 m_bottomRight.setHeight(std::max<float>(0, m_bottomRight.height() + bottomWidth));
97 }
98 }
99
cornerRectIntercept(float y,const FloatRect & cornerRect)100 static inline float cornerRectIntercept(float y, const FloatRect& cornerRect)
101 {
102 ASSERT(cornerRect.height() > 0);
103 return cornerRect.width() * sqrt(1 - (y * y) / (cornerRect.height() * cornerRect.height()));
104 }
105
xInterceptsAtY(float y,float & minXIntercept,float & maxXIntercept) const106 bool FloatRoundedRect::xInterceptsAtY(float y, float& minXIntercept, float& maxXIntercept) const
107 {
108 if (y < rect().y() || y > rect().maxY())
109 return false;
110
111 if (!isRounded()) {
112 minXIntercept = rect().x();
113 maxXIntercept = rect().maxX();
114 return true;
115 }
116
117 const FloatRect& topLeftRect = topLeftCorner();
118 const FloatRect& bottomLeftRect = bottomLeftCorner();
119
120 if (!topLeftRect.isEmpty() && y >= topLeftRect.y() && y < topLeftRect.maxY())
121 minXIntercept = topLeftRect.maxX() - cornerRectIntercept(topLeftRect.maxY() - y, topLeftRect);
122 else if (!bottomLeftRect.isEmpty() && y >= bottomLeftRect.y() && y <= bottomLeftRect.maxY())
123 minXIntercept = bottomLeftRect.maxX() - cornerRectIntercept(y - bottomLeftRect.y(), bottomLeftRect);
124 else
125 minXIntercept = m_rect.x();
126
127 const FloatRect& topRightRect = topRightCorner();
128 const FloatRect& bottomRightRect = bottomRightCorner();
129
130 if (!topRightRect.isEmpty() && y >= topRightRect.y() && y <= topRightRect.maxY())
131 maxXIntercept = topRightRect.x() + cornerRectIntercept(topRightRect.maxY() - y, topRightRect);
132 else if (!bottomRightRect.isEmpty() && y >= bottomRightRect.y() && y <= bottomRightRect.maxY())
133 maxXIntercept = bottomRightRect.x() + cornerRectIntercept(y - bottomRightRect.y(), bottomRightRect);
134 else
135 maxXIntercept = m_rect.maxX();
136
137 return true;
138 }
139
140 } // namespace blink
141