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 "platform/geometry/FloatRect.h"
29
30#include "platform/FloatConversion.h"
31#include "platform/geometry/IntRect.h"
32#include "platform/geometry/LayoutRect.h"
33#include "third_party/skia/include/core/SkRect.h"
34#include "wtf/MathExtras.h"
35
36#include <algorithm>
37#include <math.h>
38
39namespace WebCore {
40
41FloatRect::FloatRect(const IntRect& r) : m_location(r.location()), m_size(r.size())
42{
43}
44
45FloatRect::FloatRect(const LayoutRect& r) : m_location(r.location()), m_size(r.size())
46{
47}
48
49FloatRect::FloatRect(const SkRect& r) : m_location(r.fLeft, r.fTop), m_size(r.width(), r.height())
50{
51}
52
53FloatRect FloatRect::narrowPrecision(double x, double y, double width, double height)
54{
55    return FloatRect(narrowPrecisionToFloat(x), narrowPrecisionToFloat(y), narrowPrecisionToFloat(width), narrowPrecisionToFloat(height));
56}
57
58bool FloatRect::isExpressibleAsIntRect() const
59{
60    return isWithinIntRange(x()) && isWithinIntRange(y())
61        && isWithinIntRange(width()) && isWithinIntRange(height())
62        && isWithinIntRange(maxX()) && isWithinIntRange(maxY());
63}
64
65bool FloatRect::intersects(const FloatRect& other) const
66{
67    // Checking emptiness handles negative widths as well as zero.
68    return !isEmpty() && !other.isEmpty()
69        && x() < other.maxX() && other.x() < maxX()
70        && y() < other.maxY() && other.y() < maxY();
71}
72
73bool FloatRect::contains(const FloatRect& other) const
74{
75    return x() <= other.x() && maxX() >= other.maxX()
76        && y() <= other.y() && maxY() >= other.maxY();
77}
78
79bool FloatRect::contains(const FloatPoint& point, ContainsMode containsMode) const
80{
81    if (containsMode == InsideOrOnStroke)
82        return contains(point.x(), point.y());
83    return x() < point.x() && maxX() > point.x() && y() < point.y() && maxY() > point.y();
84}
85
86void FloatRect::intersect(const FloatRect& other)
87{
88    float left = std::max(x(), other.x());
89    float top = std::max(y(), other.y());
90    float right = std::min(maxX(), other.maxX());
91    float bottom = std::min(maxY(), other.maxY());
92
93    // Return a clean empty rectangle for non-intersecting cases.
94    if (left >= right || top >= bottom) {
95        left = 0;
96        top = 0;
97        right = 0;
98        bottom = 0;
99    }
100
101    setLocationAndSizeFromEdges(left, top, right, bottom);
102}
103
104void FloatRect::unite(const FloatRect& other)
105{
106    // Handle empty special cases first.
107    if (other.isEmpty())
108        return;
109    if (isEmpty()) {
110        *this = other;
111        return;
112    }
113
114    uniteEvenIfEmpty(other);
115}
116
117void FloatRect::uniteEvenIfEmpty(const FloatRect& other)
118{
119    float minX = std::min(x(), other.x());
120    float minY = std::min(y(), other.y());
121    float maxX = std::max(this->maxX(), other.maxX());
122    float maxY = std::max(this->maxY(), other.maxY());
123
124    setLocationAndSizeFromEdges(minX, minY, maxX, maxY);
125}
126
127void FloatRect::uniteIfNonZero(const FloatRect& other)
128{
129    // Handle empty special cases first.
130    if (other.isZero())
131        return;
132    if (isZero()) {
133        *this = other;
134        return;
135    }
136
137    uniteEvenIfEmpty(other);
138}
139
140void FloatRect::extend(const FloatPoint& p)
141{
142    float minX = std::min(x(), p.x());
143    float minY = std::min(y(), p.y());
144    float maxX = std::max(this->maxX(), p.x());
145    float maxY = std::max(this->maxY(), p.y());
146
147    setLocationAndSizeFromEdges(minX, minY, maxX, maxY);
148}
149
150void FloatRect::scale(float sx, float sy)
151{
152    m_location.setX(x() * sx);
153    m_location.setY(y() * sy);
154    m_size.setWidth(width() * sx);
155    m_size.setHeight(height() * sy);
156}
157
158FloatRect unionRect(const Vector<FloatRect>& rects)
159{
160    FloatRect result;
161
162    size_t count = rects.size();
163    for (size_t i = 0; i < count; ++i)
164        result.unite(rects[i]);
165
166    return result;
167}
168
169void FloatRect::fitToPoints(const FloatPoint& p0, const FloatPoint& p1)
170{
171    float left = std::min(p0.x(), p1.x());
172    float top = std::min(p0.y(), p1.y());
173    float right = std::max(p0.x(), p1.x());
174    float bottom = std::max(p0.y(), p1.y());
175
176    setLocationAndSizeFromEdges(left, top, right, bottom);
177}
178
179namespace {
180// Helpers for 3- and 4-way max and min.
181
182template <typename T>
183T min3(const T& v1, const T& v2, const T& v3)
184{
185    return std::min(std::min(v1, v2), v3);
186}
187
188template <typename T>
189T max3(const T& v1, const T& v2, const T& v3)
190{
191    return std::max(std::max(v1, v2), v3);
192}
193
194template <typename T>
195T min4(const T& v1, const T& v2, const T& v3, const T& v4)
196{
197    return std::min(std::min(v1, v2), std::min(v3, v4));
198}
199
200template <typename T>
201T max4(const T& v1, const T& v2, const T& v3, const T& v4)
202{
203    return std::max(std::max(v1, v2), std::max(v3, v4));
204}
205
206} // anonymous namespace
207
208void FloatRect::fitToPoints(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2)
209{
210    float left = min3(p0.x(), p1.x(), p2.x());
211    float top = min3(p0.y(), p1.y(), p2.y());
212    float right = max3(p0.x(), p1.x(), p2.x());
213    float bottom = max3(p0.y(), p1.y(), p2.y());
214
215    setLocationAndSizeFromEdges(left, top, right, bottom);
216}
217
218void FloatRect::fitToPoints(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& p3)
219{
220    float left = min4(p0.x(), p1.x(), p2.x(), p3.x());
221    float top = min4(p0.y(), p1.y(), p2.y(), p3.y());
222    float right = max4(p0.x(), p1.x(), p2.x(), p3.x());
223    float bottom = max4(p0.y(), p1.y(), p2.y(), p3.y());
224
225    setLocationAndSizeFromEdges(left, top, right, bottom);
226}
227
228IntRect enclosingIntRect(const FloatRect& rect)
229{
230    IntPoint location = flooredIntPoint(rect.minXMinYCorner());
231    IntPoint maxPoint = ceiledIntPoint(rect.maxXMaxYCorner());
232
233    return IntRect(location, maxPoint - location);
234}
235
236IntRect enclosedIntRect(const FloatRect& rect)
237{
238    IntPoint location = ceiledIntPoint(rect.minXMinYCorner());
239    IntPoint maxPoint = flooredIntPoint(rect.maxXMaxYCorner());
240    IntSize size = maxPoint - location;
241    size.clampNegativeToZero();
242
243    return IntRect(location, size);
244}
245
246IntRect roundedIntRect(const FloatRect& rect)
247{
248    return IntRect(roundedIntPoint(rect.location()), roundedIntSize(rect.size()));
249}
250
251FloatRect mapRect(const FloatRect& r, const FloatRect& srcRect, const FloatRect& destRect)
252{
253    if (!srcRect.width() || !srcRect.height())
254        return FloatRect();
255
256    float widthScale = destRect.width() / srcRect.width();
257    float heightScale = destRect.height() / srcRect.height();
258    return FloatRect(destRect.x() + (r.x() - srcRect.x()) * widthScale,
259        destRect.y() + (r.y() - srcRect.y()) * heightScale,
260        r.width() * widthScale, r.height() * heightScale);
261}
262
263}
264