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