2 * Copyright (C) 2005, 2006 Apple Computer, Inc. All rights reserved.
3 * 2010 Dirk Schulze <krit@webkit.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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27 #ifndef AffineTransform_h
28 #define AffineTransform_h
30 #include "platform/transforms/TransformationMatrix.h"
32 #include <string.h> // for memcpy
33 #include "wtf/FastAllocBase.h"
42 class TransformationMatrix;
44 class PLATFORM_EXPORT AffineTransform {
45 WTF_MAKE_FAST_ALLOCATED;
47 typedef double Transform[6];
50 AffineTransform(double a, double b, double c, double d, double e, double f);
52 void setMatrix(double a, double b, double c, double d, double e, double f);
54 void map(double x, double y, double& x2, double& y2) const;
56 // Rounds the mapped point to the nearest integer value.
57 IntPoint mapPoint(const IntPoint&) const;
59 FloatPoint mapPoint(const FloatPoint&) const;
61 IntSize mapSize(const IntSize&) const;
63 FloatSize mapSize(const FloatSize&) const;
65 // Rounds the resulting mapped rectangle out. This is helpful for bounding
66 // box computations but may not be what is wanted in other contexts.
67 IntRect mapRect(const IntRect&) const;
69 FloatRect mapRect(const FloatRect&) const;
70 FloatQuad mapQuad(const FloatQuad&) const;
72 bool isIdentity() const;
74 double a() const { return m_transform[0]; }
75 void setA(double a) { m_transform[0] = a; }
76 double b() const { return m_transform[1]; }
77 void setB(double b) { m_transform[1] = b; }
78 double c() const { return m_transform[2]; }
79 void setC(double c) { m_transform[2] = c; }
80 double d() const { return m_transform[3]; }
81 void setD(double d) { m_transform[3] = d; }
82 double e() const { return m_transform[4]; }
83 void setE(double e) { m_transform[4] = e; }
84 double f() const { return m_transform[5]; }
85 void setF(double f) { m_transform[5] = f; }
89 AffineTransform& multiply(const AffineTransform& other);
90 AffineTransform& scale(double);
91 AffineTransform& scale(double sx, double sy);
92 AffineTransform& scaleNonUniform(double sx, double sy);
93 AffineTransform& rotate(double a);
94 AffineTransform& rotateRadians(double a);
95 AffineTransform& rotateFromVector(double x, double y);
96 AffineTransform& translate(double tx, double ty);
97 AffineTransform& shear(double sx, double sy);
98 AffineTransform& flipX();
99 AffineTransform& flipY();
100 AffineTransform& skew(double angleX, double angleY);
101 AffineTransform& skewX(double angle);
102 AffineTransform& skewY(double angle);
104 double xScale() const;
105 double yScale() const;
108 bool isInvertible() const;
109 AffineTransform inverse() const;
111 TransformationMatrix toTransformationMatrix() const;
113 bool isIdentityOrTranslation() const
115 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && m_transform[3] == 1;
118 bool isIdentityOrTranslationOrFlipped() const
120 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && (m_transform[3] == 1 || m_transform[3] == -1);
123 bool preservesAxisAlignment() const
125 return (m_transform[1] == 0 && m_transform[2] == 0) || (m_transform[0] == 0 && m_transform[3] == 0);
128 bool operator== (const AffineTransform& m2) const
130 return (m_transform[0] == m2.m_transform[0]
131 && m_transform[1] == m2.m_transform[1]
132 && m_transform[2] == m2.m_transform[2]
133 && m_transform[3] == m2.m_transform[3]
134 && m_transform[4] == m2.m_transform[4]
135 && m_transform[5] == m2.m_transform[5]);
138 bool operator!=(const AffineTransform& other) const { return !(*this == other); }
140 // *this = *this * t (i.e., a multRight)
141 AffineTransform& operator*=(const AffineTransform& t)
146 // result = *this * t (i.e., a multRight)
147 AffineTransform operator*(const AffineTransform& t) const
149 AffineTransform result = *this;
154 static AffineTransform translation(double x, double y)
156 return AffineTransform(1, 0, 0, 1, x, y);
159 // decompose the matrix into its component parts
161 double scaleX, scaleY;
163 double remainderA, remainderB, remainderC, remainderD;
164 double translateX, translateY;
167 bool decompose(DecomposedType&) const;
168 void recompose(const DecomposedType&);
171 void setMatrix(const Transform m)
173 if (m && m != m_transform)
174 memcpy(m_transform, m, sizeof(Transform));
177 Transform m_transform;
180 PLATFORM_EXPORT AffineTransform makeMapBetweenRects(const FloatRect& source, const FloatRect& dest);