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.
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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 "TransformationMatrix.h"
32 #include <string.h> // for memcpy
33 #include <wtf/FastAllocBase.h>
36 #include <CoreGraphics/CGAffineTransform.h>
39 #elif PLATFORM(OPENVG)
45 #elif PLATFORM(WX) && USE(WXGC)
46 #include <wx/graphics.h>
56 class TransformationMatrix;
58 class AffineTransform {
59 WTF_MAKE_FAST_ALLOCATED;
61 typedef double Transform[6];
64 AffineTransform(double a, double b, double c, double d, double e, double f);
66 void setMatrix(double a, double b, double c, double d, double e, double f);
68 void map(double x, double y, double& x2, double& y2) const;
70 // Rounds the mapped point to the nearest integer value.
71 IntPoint mapPoint(const IntPoint&) const;
73 FloatPoint mapPoint(const FloatPoint&) const;
75 // Rounds the resulting mapped rectangle out. This is helpful for bounding
76 // box computations but may not be what is wanted in other contexts.
77 IntRect mapRect(const IntRect&) const;
79 FloatRect mapRect(const FloatRect&) const;
80 FloatQuad mapQuad(const FloatQuad&) const;
82 bool isIdentity() const;
84 double a() const { return m_transform[0]; }
85 void setA(double a) { m_transform[0] = a; }
86 double b() const { return m_transform[1]; }
87 void setB(double b) { m_transform[1] = b; }
88 double c() const { return m_transform[2]; }
89 void setC(double c) { m_transform[2] = c; }
90 double d() const { return m_transform[3]; }
91 void setD(double d) { m_transform[3] = d; }
92 double e() const { return m_transform[4]; }
93 void setE(double e) { m_transform[4] = e; }
94 double f() const { return m_transform[5]; }
95 void setF(double f) { m_transform[5] = f; }
99 AffineTransform& multiply(const AffineTransform& other);
100 AffineTransform& scale(double);
101 AffineTransform& scale(double sx, double sy);
102 AffineTransform& scaleNonUniform(double sx, double sy);
103 AffineTransform& rotate(double d);
104 AffineTransform& rotateFromVector(double x, double y);
105 AffineTransform& translate(double tx, double ty);
106 AffineTransform& shear(double sx, double sy);
107 AffineTransform& flipX();
108 AffineTransform& flipY();
109 AffineTransform& skew(double angleX, double angleY);
110 AffineTransform& skewX(double angle);
111 AffineTransform& skewY(double angle);
113 double xScale() const;
114 double yScale() const;
117 bool isInvertible() const;
118 AffineTransform inverse() const;
120 void blend(const AffineTransform& from, double progress);
122 TransformationMatrix toTransformationMatrix() const;
124 bool isIdentityOrTranslation() const
126 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && m_transform[3] == 1;
129 bool isIdentityOrTranslationOrFlipped() const
131 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && (m_transform[3] == 1 || m_transform[3] == -1);
134 bool preservesAxisAlignment() const
136 return (m_transform[1] == 0 && m_transform[2] == 0) || (m_transform[0] == 0 && m_transform[3] == 0);
139 bool operator== (const AffineTransform& m2) const
141 return (m_transform[0] == m2.m_transform[0]
142 && m_transform[1] == m2.m_transform[1]
143 && m_transform[2] == m2.m_transform[2]
144 && m_transform[3] == m2.m_transform[3]
145 && m_transform[4] == m2.m_transform[4]
146 && m_transform[5] == m2.m_transform[5]);
149 bool operator!=(const AffineTransform& other) const { return !(*this == other); }
151 // *this = *this * t (i.e., a multRight)
152 AffineTransform& operator*=(const AffineTransform& t)
157 // result = *this * t (i.e., a multRight)
158 AffineTransform operator*(const AffineTransform& t) const
160 AffineTransform result = *this;
166 operator CGAffineTransform() const;
168 operator cairo_matrix_t() const;
169 #elif PLATFORM(OPENVG)
170 operator VGMatrix() const;
172 operator QTransform() const;
174 operator SkMatrix() const;
175 #elif PLATFORM(WX) && USE(WXGC)
176 operator wxGraphicsMatrix() const;
179 static AffineTransform translation(double x, double y)
181 return AffineTransform(1, 0, 0, 1, x, y);
184 // decompose the matrix into its component parts
186 double scaleX, scaleY;
188 double remainderA, remainderB, remainderC, remainderD;
189 double translateX, translateY;
192 bool decompose(DecomposedType&) const;
193 void recompose(const DecomposedType&);
196 void setMatrix(const Transform m)
198 if (m && m != m_transform)
199 memcpy(m_transform, m, sizeof(Transform));
202 Transform m_transform;
205 AffineTransform makeMapBetweenRects(const FloatRect& source, const FloatRect& dest);