1 /* 2 * Copyright (C) 2005, 2006 Apple Computer, Inc. All rights reserved. 3 * 2010 Dirk Schulze <krit (at) webkit.org> 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 #ifndef AffineTransform_h 28 #define AffineTransform_h 29 30 #include "platform/transforms/TransformationMatrix.h" 31 32 #include <string.h> // for memcpy 33 #include "wtf/FastAllocBase.h" 34 35 namespace blink { 36 37 class FloatPoint; 38 class FloatQuad; 39 class FloatRect; 40 class IntPoint; 41 class IntRect; 42 class TransformationMatrix; 43 44 class PLATFORM_EXPORT AffineTransform { 45 WTF_MAKE_FAST_ALLOCATED; 46 public: 47 typedef double Transform[6]; 48 49 AffineTransform(); 50 AffineTransform(double a, double b, double c, double d, double e, double f); 51 52 void setMatrix(double a, double b, double c, double d, double e, double f); 53 54 void map(double x, double y, double& x2, double& y2) const; 55 56 // Rounds the mapped point to the nearest integer value. 57 IntPoint mapPoint(const IntPoint&) const; 58 59 FloatPoint mapPoint(const FloatPoint&) const; 60 61 IntSize mapSize(const IntSize&) const; 62 63 FloatSize mapSize(const FloatSize&) const; 64 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; 68 69 FloatRect mapRect(const FloatRect&) const; 70 FloatQuad mapQuad(const FloatQuad&) const; 71 72 bool isIdentity() const; 73 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; } 86 87 void makeIdentity(); 88 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); 103 104 double xScale() const; 105 double yScale() const; 106 107 double det() const; 108 bool isInvertible() const; 109 AffineTransform inverse() const; 110 111 TransformationMatrix toTransformationMatrix() const; 112 113 bool isIdentityOrTranslation() const 114 { 115 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && m_transform[3] == 1; 116 } 117 118 bool isIdentityOrTranslationOrFlipped() const 119 { 120 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && (m_transform[3] == 1 || m_transform[3] == -1); 121 } 122 123 bool preservesAxisAlignment() const 124 { 125 return (m_transform[1] == 0 && m_transform[2] == 0) || (m_transform[0] == 0 && m_transform[3] == 0); 126 } 127 128 bool operator== (const AffineTransform& m2) const 129 { 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]); 136 } 137 138 bool operator!=(const AffineTransform& other) const { return !(*this == other); } 139 140 // *this = *this * t (i.e., a multRight) 141 AffineTransform& operator*=(const AffineTransform& t) 142 { 143 return multiply(t); 144 } 145 146 // result = *this * t (i.e., a multRight) 147 AffineTransform operator*(const AffineTransform& t) const 148 { 149 AffineTransform result = *this; 150 result *= t; 151 return result; 152 } 153 154 static AffineTransform translation(double x, double y) 155 { 156 return AffineTransform(1, 0, 0, 1, x, y); 157 } 158 159 // decompose the matrix into its component parts 160 typedef struct { 161 double scaleX, scaleY; 162 double angle; 163 double remainderA, remainderB, remainderC, remainderD; 164 double translateX, translateY; 165 } DecomposedType; 166 167 bool decompose(DecomposedType&) const; 168 void recompose(const DecomposedType&); 169 170 private: 171 void setMatrix(const Transform m) 172 { 173 if (m && m != m_transform) 174 memcpy(m_transform, m, sizeof(Transform)); 175 } 176 177 Transform m_transform; 178 }; 179 180 } 181 182 #endif 183
