1/* 2 * Copyright (C) 2005, 2006 Apple 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 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 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 <array> 31#include <wtf/FastMalloc.h> 32 33#if USE(CG) 34typedef struct CGAffineTransform CGAffineTransform; 35#elif USE(CAIRO) 36#include <cairo.h> 37#endif 38 39namespace WebCore { 40 41class FloatPoint; 42class FloatQuad; 43class FloatRect; 44class FloatSize; 45class IntPoint; 46class IntSize; 47class IntRect; 48class TransformationMatrix; 49 50class AffineTransform { 51 WTF_MAKE_FAST_ALLOCATED; 52public: 53 AffineTransform(); 54 AffineTransform(double a, double b, double c, double d, double e, double f); 55 56#if USE(CG) 57 AffineTransform(const CGAffineTransform&); 58#endif 59 60 void setMatrix(double a, double b, double c, double d, double e, double f); 61 62 void map(double x, double y, double& x2, double& y2) const; 63 64 // Rounds the mapped point to the nearest integer value. 65 IntPoint mapPoint(const IntPoint&) const; 66 67 FloatPoint mapPoint(const FloatPoint&) const; 68 69 IntSize mapSize(const IntSize&) const; 70 71 FloatSize mapSize(const FloatSize&) const; 72 73 // Rounds the resulting mapped rectangle out. This is helpful for bounding 74 // box computations but may not be what is wanted in other contexts. 75 IntRect mapRect(const IntRect&) const; 76 77 FloatRect mapRect(const FloatRect&) const; 78 FloatQuad mapQuad(const FloatQuad&) const; 79 80 bool isIdentity() const; 81 82 double a() const { return m_transform[0]; } 83 void setA(double a) { m_transform[0] = a; } 84 double b() const { return m_transform[1]; } 85 void setB(double b) { m_transform[1] = b; } 86 double c() const { return m_transform[2]; } 87 void setC(double c) { m_transform[2] = c; } 88 double d() const { return m_transform[3]; } 89 void setD(double d) { m_transform[3] = d; } 90 double e() const { return m_transform[4]; } 91 void setE(double e) { m_transform[4] = e; } 92 double f() const { return m_transform[5]; } 93 void setF(double f) { m_transform[5] = f; } 94 95 void makeIdentity(); 96 97 AffineTransform& multiply(const AffineTransform& other); 98 AffineTransform& scale(double); 99 AffineTransform& scale(double sx, double sy); 100 AffineTransform& scaleNonUniform(double sx, double sy); 101 AffineTransform& rotate(double d); 102 AffineTransform& rotateFromVector(double x, double y); 103 AffineTransform& translate(double tx, double ty); 104 AffineTransform& shear(double sx, double sy); 105 AffineTransform& flipX(); 106 AffineTransform& flipY(); 107 AffineTransform& skew(double angleX, double angleY); 108 AffineTransform& skewX(double angle); 109 AffineTransform& skewY(double angle); 110 111 // These functions get the length of an axis-aligned unit vector 112 // once it has been mapped through the transform 113 double xScale() const; 114 double yScale() const; 115 116 double det() const; 117 bool isInvertible() const; 118 AffineTransform inverse() const; 119 120 void blend(const AffineTransform& from, double progress); 121 122 TransformationMatrix toTransformationMatrix() const; 123 124 bool isIdentityOrTranslation() const 125 { 126 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && m_transform[3] == 1; 127 } 128 129 bool isIdentityOrTranslationOrFlipped() const 130 { 131 return m_transform[0] == 1 && m_transform[1] == 0 && m_transform[2] == 0 && (m_transform[3] == 1 || m_transform[3] == -1); 132 } 133 134 bool preservesAxisAlignment() const 135 { 136 return (m_transform[1] == 0 && m_transform[2] == 0) || (m_transform[0] == 0 && m_transform[3] == 0); 137 } 138 139 bool operator== (const AffineTransform& m2) const 140 { 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]); 147 } 148 149 bool operator!=(const AffineTransform& other) const { return !(*this == other); } 150 151 // *this = *this * t (i.e., a multRight) 152 AffineTransform& operator*=(const AffineTransform& t) 153 { 154 return multiply(t); 155 } 156 157 // result = *this * t (i.e., a multRight) 158 AffineTransform operator*(const AffineTransform& t) const 159 { 160 AffineTransform result = *this; 161 result *= t; 162 return result; 163 } 164 165#if USE(CG) 166 operator CGAffineTransform() const; 167#elif USE(CAIRO) 168 operator cairo_matrix_t() const; 169#endif 170 171 static AffineTransform translation(double x, double y) 172 { 173 return AffineTransform(1, 0, 0, 1, x, y); 174 } 175 176 // decompose the matrix into its component parts 177 typedef struct { 178 double scaleX, scaleY; 179 double angle; 180 double remainderA, remainderB, remainderC, remainderD; 181 double translateX, translateY; 182 } DecomposedType; 183 184 bool decompose(DecomposedType&) const; 185 void recompose(const DecomposedType&); 186 187private: 188 std::array<double, 6> m_transform; 189}; 190 191AffineTransform makeMapBetweenRects(const FloatRect& source, const FloatRect& dest); 192 193} 194 195#endif 196