1/*
2 * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
3 * Copyright (C) 2005 Nokia.  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 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "FloatRect.h"
29
30#include "FloatConversion.h"
31#include "IntRect.h"
32#include <algorithm>
33#include <math.h>
34#include <wtf/MathExtras.h>
35
36using std::max;
37using std::min;
38
39namespace WebCore {
40
41FloatRect::FloatRect(const IntRect& r) : m_location(r.location()), m_size(r.size())
42{
43}
44
45FloatRect FloatRect::narrowPrecision(double x, double y, double width, double height)
46{
47    return FloatRect(narrowPrecisionToFloat(x), narrowPrecisionToFloat(y), narrowPrecisionToFloat(width), narrowPrecisionToFloat(height));
48}
49
50bool FloatRect::intersects(const FloatRect& other) const
51{
52    // Checking emptiness handles negative widths as well as zero.
53    return !isEmpty() && !other.isEmpty()
54        && x() < other.maxX() && other.x() < maxX()
55        && y() < other.maxY() && other.y() < maxY();
56}
57
58bool FloatRect::contains(const FloatRect& other) const
59{
60    return x() <= other.x() && maxX() >= other.maxX()
61        && y() <= other.y() && maxY() >= other.maxY();
62}
63
64void FloatRect::intersect(const FloatRect& other)
65{
66    float l = max(x(), other.x());
67    float t = max(y(), other.y());
68    float r = min(maxX(), other.maxX());
69    float b = min(maxY(), other.maxY());
70
71    // Return a clean empty rectangle for non-intersecting cases.
72    if (l >= r || t >= b) {
73        l = 0;
74        t = 0;
75        r = 0;
76        b = 0;
77    }
78
79    setLocationAndSizeFromEdges(l, t, r, b);
80}
81
82void FloatRect::unite(const FloatRect& other)
83{
84    // Handle empty special cases first.
85    if (other.isEmpty())
86        return;
87    if (isEmpty()) {
88        *this = other;
89        return;
90    }
91
92    float l = min(x(), other.x());
93    float t = min(y(), other.y());
94    float r = max(maxX(), other.maxX());
95    float b = max(maxY(), other.maxY());
96
97    setLocationAndSizeFromEdges(l, t, r, b);
98}
99
100void FloatRect::uniteIfNonZero(const FloatRect& other)
101{
102    // Handle empty special cases first.
103    if (!other.width() && !other.height())
104        return;
105    if (!width() && !height()) {
106        *this = other;
107        return;
108    }
109
110    float left = min(x(), other.x());
111    float top = min(y(), other.y());
112    float right = max(maxX(), other.maxX());
113    float bottom = max(maxY(), other.maxY());
114
115    setLocationAndSizeFromEdges(left, top, right, bottom);
116}
117
118void FloatRect::scale(float sx, float sy)
119{
120    m_location.setX(x() * sx);
121    m_location.setY(y() * sy);
122    m_size.setWidth(width() * sx);
123    m_size.setHeight(height() * sy);
124}
125
126void FloatRect::fitToPoints(const FloatPoint& p0, const FloatPoint& p1)
127{
128    float left = min(p0.x(), p1.x());
129    float top = min(p0.y(), p1.y());
130    float right = max(p0.x(), p1.x());
131    float bottom = max(p0.y(), p1.y());
132
133    setLocationAndSizeFromEdges(left, top, right, bottom);
134}
135
136namespace {
137// Helpers for 3- and 4-way max and min.
138
139template <typename T>
140T min3(const T& v1, const T& v2, const T& v3)
141{
142    return min(min(v1, v2), v3);
143}
144
145template <typename T>
146T max3(const T& v1, const T& v2, const T& v3)
147{
148    return max(max(v1, v2), v3);
149}
150
151template <typename T>
152T min4(const T& v1, const T& v2, const T& v3, const T& v4)
153{
154    return min(min(v1, v2), min(v3, v4));
155}
156
157template <typename T>
158T max4(const T& v1, const T& v2, const T& v3, const T& v4)
159{
160    return max(max(v1, v2), max(v3, v4));
161}
162
163} // anonymous namespace
164
165void FloatRect::fitToPoints(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2)
166{
167    float left = min3(p0.x(), p1.x(), p2.x());
168    float top = min3(p0.y(), p1.y(), p2.y());
169    float right = max3(p0.x(), p1.x(), p2.x());
170    float bottom = max3(p0.y(), p1.y(), p2.y());
171
172    setLocationAndSizeFromEdges(left, top, right, bottom);
173}
174
175void FloatRect::fitToPoints(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& p3)
176{
177    float left = min4(p0.x(), p1.x(), p2.x(), p3.x());
178    float top = min4(p0.y(), p1.y(), p2.y(), p3.y());
179    float right = max4(p0.x(), p1.x(), p2.x(), p3.x());
180    float bottom = max4(p0.y(), p1.y(), p2.y(), p3.y());
181
182    setLocationAndSizeFromEdges(left, top, right, bottom);
183}
184
185IntRect enclosingIntRect(const FloatRect& rect)
186{
187    float left = floorf(rect.x());
188    float top = floorf(rect.y());
189    float width = ceilf(rect.maxX()) - left;
190    float height = ceilf(rect.maxY()) - top;
191
192    return IntRect(clampToInteger(left), clampToInteger(top),
193                   clampToInteger(width), clampToInteger(height));
194}
195
196FloatRect mapRect(const FloatRect& r, const FloatRect& srcRect, const FloatRect& destRect)
197{
198    if (srcRect.width() == 0 || srcRect.height() == 0)
199        return FloatRect();
200
201    float widthScale = destRect.width() / srcRect.width();
202    float heightScale = destRect.height() / srcRect.height();
203    return FloatRect(destRect.x() + (r.x() - srcRect.x()) * widthScale,
204                     destRect.y() + (r.y() - srcRect.y()) * heightScale,
205                     r.width() * widthScale, r.height() * heightScale);
206}
207
208}
209