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 "core/platform/graphics/transforms/TransformationMatrix.h" 31 32 #include <string.h> // for memcpy 33 #include "wtf/FastAllocBase.h" 34 35 #include <SkMatrix.h> 36 37 namespace WebCore { 38 39 class FloatPoint; 40 class FloatQuad; 41 class FloatRect; 42 class IntPoint; 43 class IntRect; 44 class TransformationMatrix; 45 46 class AffineTransform { 47 WTF_MAKE_FAST_ALLOCATED; 48 public: 49 typedef double Transform[6]; 50 51 AffineTransform(); 52 AffineTransform(double a, double b, double c, double d, double e, double f); 53 54 void setMatrix(double a, double b, double c, double d, double e, double f); 55 56 void map(double x, double y, double& x2, double& y2) const; 57 58 // Rounds the mapped point to the nearest integer value. 59 IntPoint mapPoint(const IntPoint&) const; 60 61 FloatPoint mapPoint(const FloatPoint&) const; 62 63 IntSize mapSize(const IntSize&) const; 64 65 FloatSize mapSize(const FloatSize&) const; 66 67 // Rounds the resulting mapped rectangle out. This is helpful for bounding 68 // box computations but may not be what is wanted in other contexts. 69 IntRect mapRect(const IntRect&) const; 70 71 FloatRect mapRect(const FloatRect&) const; 72 FloatQuad mapQuad(const FloatQuad&) const; 73 74 bool isIdentity() const; 75 76 double a() const { return m_transform[0]; } 77 void setA(double a) { m_transform[0] = a; } 78 double b() const { return m_transform[1]; } 79 void setB(double b) { m_transform[1] = b; } 80 double c() const { return m_transform[2]; } 81 void setC(double c) { m_transform[2] = c; } 82 double d() const { return m_transform[3]; } 83 void setD(double d) { m_transform[3] = d; } 84 double e() const { return m_transform[4]; } 85 void setE(double e) { m_transform[4] = e; } 86 double f() const { return m_transform[5]; } 87 void setF(double f) { m_transform[5] = f; } 88 89 void makeIdentity(); 90 91 AffineTransform& multiply(const AffineTransform& other); 92 AffineTransform& scale(double); 93 AffineTransform& scale(double sx, double sy); 94 AffineTransform& scaleNonUniform(double sx, double sy); 95 AffineTransform& rotate(double d); 96 AffineTransform& rotateFromVector(double x, double y); 97 AffineTransform& translate(double tx, double ty); 98 AffineTransform& shear(double sx, double sy); 99 AffineTransform& flipX(); 100 AffineTransform& flipY(); 101 AffineTransform& skew(double angleX, double angleY); 102 AffineTransform& skewX(double angle); 103 AffineTransform& skewY(double angle); 104 105 double xScale() const; 106 double yScale() const; 107 108 double det() const; 109 bool isInvertible() const; 110 AffineTransform inverse() const; 111 112 void blend(const AffineTransform& from, double progress); 113 114 TransformationMatrix toTransformationMatrix() const; 115 116 bool isIdentityOrTranslation() const 117 { 118 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && m_transform[3] == 1; 119 } 120 121 bool isIdentityOrTranslationOrFlipped() const 122 { 123 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && (m_transform[3] == 1 || m_transform[3] == -1); 124 } 125 126 bool preservesAxisAlignment() const 127 { 128 return (m_transform[1] == 0 && m_transform[2] == 0) || (m_transform[0] == 0 && m_transform[3] == 0); 129 } 130 131 bool operator== (const AffineTransform& m2) const 132 { 133 return (m_transform[0] == m2.m_transform[0] 134 && m_transform[1] == m2.m_transform[1] 135 && m_transform[2] == m2.m_transform[2] 136 && m_transform[3] == m2.m_transform[3] 137 && m_transform[4] == m2.m_transform[4] 138 && m_transform[5] == m2.m_transform[5]); 139 } 140 141 bool operator!=(const AffineTransform& other) const { return !(*this == other); } 142 143 // *this = *this * t (i.e., a multRight) 144 AffineTransform& operator*=(const AffineTransform& t) 145 { 146 return multiply(t); 147 } 148 149 // result = *this * t (i.e., a multRight) 150 AffineTransform operator*(const AffineTransform& t) const 151 { 152 AffineTransform result = *this; 153 result *= t; 154 return result; 155 } 156 157 operator SkMatrix() const; 158 159 static AffineTransform translation(double x, double y) 160 { 161 return AffineTransform(1, 0, 0, 1, x, y); 162 } 163 164 // decompose the matrix into its component parts 165 typedef struct { 166 double scaleX, scaleY; 167 double angle; 168 double remainderA, remainderB, remainderC, remainderD; 169 double translateX, translateY; 170 } DecomposedType; 171 172 bool decompose(DecomposedType&) const; 173 void recompose(const DecomposedType&); 174 175 private: 176 void setMatrix(const Transform m) 177 { 178 if (m && m != m_transform) 179 memcpy(m_transform, m, sizeof(Transform)); 180 } 181 182 Transform m_transform; 183 }; 184 185 AffineTransform makeMapBetweenRects(const FloatRect& source, const FloatRect& dest); 186 187 } 188 189 #endif 190