1/*
2 * Copyright (C) 2004, 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#ifndef FloatPoint_h
28#define FloatPoint_h
29
30#include "FloatSize.h"
31#include "IntPoint.h"
32#include <wtf/MathExtras.h>
33
34#if USE(CG)
35typedef struct CGPoint CGPoint;
36#endif
37
38#if PLATFORM(MAC)
39#ifdef NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES
40typedef struct CGPoint NSPoint;
41#else
42typedef struct _NSPoint NSPoint;
43#endif
44#endif // PLATFORM(MAC)
45
46namespace WebCore {
47
48class AffineTransform;
49class TransformationMatrix;
50class IntPoint;
51class IntSize;
52
53class FloatPoint {
54public:
55    FloatPoint() : m_x(0), m_y(0) { }
56    FloatPoint(float x, float y) : m_x(x), m_y(y) { }
57    FloatPoint(const IntPoint&);
58    explicit FloatPoint(const FloatSize& size) : m_x(size.width()), m_y(size.height()) { }
59
60    static FloatPoint zero() { return FloatPoint(); }
61
62    static FloatPoint narrowPrecision(double x, double y);
63
64    float x() const { return m_x; }
65    float y() const { return m_y; }
66
67    void setX(float x) { m_x = x; }
68    void setY(float y) { m_y = y; }
69    void set(float x, float y)
70    {
71        m_x = x;
72        m_y = y;
73    }
74    void move(float dx, float dy)
75    {
76        m_x += dx;
77        m_y += dy;
78    }
79    void move(const IntSize& a)
80    {
81        m_x += a.width();
82        m_y += a.height();
83    }
84    void move(const FloatSize& a)
85    {
86        m_x += a.width();
87        m_y += a.height();
88    }
89    void moveBy(const IntPoint& a)
90    {
91        m_x += a.x();
92        m_y += a.y();
93    }
94    void moveBy(const FloatPoint& a)
95    {
96        m_x += a.x();
97        m_y += a.y();
98    }
99    void scale(float sx, float sy)
100    {
101        m_x *= sx;
102        m_y *= sy;
103    }
104
105    void normalize();
106
107    float dot(const FloatPoint& a) const
108    {
109        return m_x * a.x() + m_y * a.y();
110    }
111
112    float slopeAngleRadians() const;
113    float length() const;
114    float lengthSquared() const
115    {
116        return m_x * m_x + m_y * m_y;
117    }
118
119    FloatPoint shrunkTo(const FloatPoint& other) const
120    {
121        return FloatPoint(std::min(m_x, other.m_x), std::min(m_y, other.m_y));
122    }
123
124    FloatPoint expandedTo(const FloatPoint& other) const
125    {
126        return FloatPoint(std::max(m_x, other.m_x), std::max(m_y, other.m_y));
127    }
128
129    FloatPoint transposedPoint() const
130    {
131        return FloatPoint(m_y, m_x);
132    }
133
134#if USE(CG)
135    FloatPoint(const CGPoint&);
136    operator CGPoint() const;
137#endif
138
139#if PLATFORM(MAC) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
140    FloatPoint(const NSPoint&);
141    operator NSPoint() const;
142#endif
143
144    FloatPoint matrixTransform(const TransformationMatrix&) const;
145    FloatPoint matrixTransform(const AffineTransform&) const;
146
147    void dump(WTF::PrintStream& out) const;
148
149private:
150    float m_x, m_y;
151};
152
153
154inline FloatPoint& operator+=(FloatPoint& a, const FloatSize& b)
155{
156    a.move(b.width(), b.height());
157    return a;
158}
159
160inline FloatPoint& operator+=(FloatPoint& a, const FloatPoint& b)
161{
162    a.move(b.x(), b.y());
163    return a;
164}
165
166inline FloatPoint& operator-=(FloatPoint& a, const FloatSize& b)
167{
168    a.move(-b.width(), -b.height());
169    return a;
170}
171
172inline FloatPoint operator+(const FloatPoint& a, const FloatSize& b)
173{
174    return FloatPoint(a.x() + b.width(), a.y() + b.height());
175}
176
177inline FloatPoint operator+(const FloatPoint& a, const FloatPoint& b)
178{
179    return FloatPoint(a.x() + b.x(), a.y() + b.y());
180}
181
182inline FloatSize operator-(const FloatPoint& a, const FloatPoint& b)
183{
184    return FloatSize(a.x() - b.x(), a.y() - b.y());
185}
186
187inline FloatPoint operator-(const FloatPoint& a, const FloatSize& b)
188{
189    return FloatPoint(a.x() - b.width(), a.y() - b.height());
190}
191
192inline FloatPoint operator-(const FloatPoint& a)
193{
194    return FloatPoint(-a.x(), -a.y());
195}
196
197inline bool operator==(const FloatPoint& a, const FloatPoint& b)
198{
199    return a.x() == b.x() && a.y() == b.y();
200}
201
202inline bool operator!=(const FloatPoint& a, const FloatPoint& b)
203{
204    return a.x() != b.x() || a.y() != b.y();
205}
206
207inline float operator*(const FloatPoint& a, const FloatPoint& b)
208{
209    // dot product
210    return a.dot(b);
211}
212
213inline IntPoint roundedIntPoint(const FloatPoint& p)
214{
215    return IntPoint(clampToInteger(roundf(p.x())), clampToInteger(roundf(p.y())));
216}
217
218inline IntPoint flooredIntPoint(const FloatPoint& p)
219{
220    return IntPoint(clampToInteger(floorf(p.x())), clampToInteger(floorf(p.y())));
221}
222
223inline FloatPoint flooredToDevicePixels(const FloatPoint& p, float deviceScaleFactor)
224{
225    return FloatPoint(floorf(p.x() * deviceScaleFactor)  / deviceScaleFactor, floorf(p.y() * deviceScaleFactor)  / deviceScaleFactor);
226}
227
228inline IntPoint ceiledIntPoint(const FloatPoint& p)
229{
230    return IntPoint(clampToInteger(ceilf(p.x())), clampToInteger(ceilf(p.y())));
231}
232
233inline FloatPoint ceiledToDevicePixels(const FloatPoint& p, float deviceScaleFactor)
234{
235    return FloatPoint(ceilf(p.x() * deviceScaleFactor)  / deviceScaleFactor, ceilf(p.y() * deviceScaleFactor)  / deviceScaleFactor);
236}
237
238inline IntSize flooredIntSize(const FloatPoint& p)
239{
240    return IntSize(clampToInteger(floorf(p.x())), clampToInteger(floorf(p.y())));
241}
242
243inline FloatSize toFloatSize(const FloatPoint& a)
244{
245    return FloatSize(a.x(), a.y());
246}
247
248inline FloatPoint toFloatPoint(const FloatSize& a)
249{
250    return FloatPoint(a.width(), a.height());
251}
252
253}
254
255#endif
256