1 /* 2 * Copyright (C) 2005, 2006 Apple Computer, Inc. All rights reserved. 3 * 2010 Dirk Schulze <krit@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 WebCore { 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 a()74 double a() const { return m_transform[0]; } setA(double a)75 void setA(double a) { m_transform[0] = a; } b()76 double b() const { return m_transform[1]; } setB(double b)77 void setB(double b) { m_transform[1] = b; } c()78 double c() const { return m_transform[2]; } setC(double c)79 void setC(double c) { m_transform[2] = c; } d()80 double d() const { return m_transform[3]; } setD(double d)81 void setD(double d) { m_transform[3] = d; } e()82 double e() const { return m_transform[4]; } setE(double e)83 void setE(double e) { m_transform[4] = e; } f()84 double f() const { return m_transform[5]; } setF(double f)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 d); 94 AffineTransform& rotateFromVector(double x, double y); 95 AffineTransform& translate(double tx, double ty); 96 AffineTransform& shear(double sx, double sy); 97 AffineTransform& flipX(); 98 AffineTransform& flipY(); 99 AffineTransform& skew(double angleX, double angleY); 100 AffineTransform& skewX(double angle); 101 AffineTransform& skewY(double angle); 102 103 double xScale() const; 104 double yScale() const; 105 106 double det() const; 107 bool isInvertible() const; 108 AffineTransform inverse() const; 109 110 void blend(const AffineTransform& from, double progress); 111 112 TransformationMatrix toTransformationMatrix() const; 113 isIdentityOrTranslation()114 bool isIdentityOrTranslation() const 115 { 116 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && m_transform[3] == 1; 117 } 118 isIdentityOrTranslationOrFlipped()119 bool isIdentityOrTranslationOrFlipped() const 120 { 121 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && (m_transform[3] == 1 || m_transform[3] == -1); 122 } 123 preservesAxisAlignment()124 bool preservesAxisAlignment() const 125 { 126 return (m_transform[1] == 0 && m_transform[2] == 0) || (m_transform[0] == 0 && m_transform[3] == 0); 127 } 128 129 bool operator== (const AffineTransform& m2) const 130 { 131 return (m_transform[0] == m2.m_transform[0] 132 && m_transform[1] == m2.m_transform[1] 133 && m_transform[2] == m2.m_transform[2] 134 && m_transform[3] == m2.m_transform[3] 135 && m_transform[4] == m2.m_transform[4] 136 && m_transform[5] == m2.m_transform[5]); 137 } 138 139 bool operator!=(const AffineTransform& other) const { return !(*this == other); } 140 141 // *this = *this * t (i.e., a multRight) 142 AffineTransform& operator*=(const AffineTransform& t) 143 { 144 return multiply(t); 145 } 146 147 // result = *this * t (i.e., a multRight) 148 AffineTransform operator*(const AffineTransform& t) const 149 { 150 AffineTransform result = *this; 151 result *= t; 152 return result; 153 } 154 translation(double x,double y)155 static AffineTransform translation(double x, double y) 156 { 157 return AffineTransform(1, 0, 0, 1, x, y); 158 } 159 160 // decompose the matrix into its component parts 161 typedef struct { 162 double scaleX, scaleY; 163 double angle; 164 double remainderA, remainderB, remainderC, remainderD; 165 double translateX, translateY; 166 } DecomposedType; 167 168 bool decompose(DecomposedType&) const; 169 void recompose(const DecomposedType&); 170 171 private: setMatrix(const Transform m)172 void setMatrix(const Transform m) 173 { 174 if (m && m != m_transform) 175 memcpy(m_transform, m, sizeof(Transform)); 176 } 177 178 Transform m_transform; 179 }; 180 181 PLATFORM_EXPORT AffineTransform makeMapBetweenRects(const FloatRect& source, const FloatRect& dest); 182 183 } 184 185 #endif 186