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 "TransformationMatrix.h" 31 32 #include <string.h> // for memcpy 33 #include <wtf/FastAllocBase.h> 34 35 #if USE(CG) 36 #include <CoreGraphics/CGAffineTransform.h> 37 #elif USE(CAIRO) 38 #include <cairo.h> 39 #elif PLATFORM(OPENVG) 40 #include "VGUtils.h" 41 #elif PLATFORM(QT) 42 #include <QTransform> 43 #elif USE(SKIA) 44 #include <SkMatrix.h> 45 #elif PLATFORM(WX) && USE(WXGC) 46 #include <wx/graphics.h> 47 #endif 48 49 namespace WebCore { 50 51 class FloatPoint; 52 class FloatQuad; 53 class FloatRect; 54 class IntPoint; 55 class IntRect; 56 class TransformationMatrix; 57 58 class AffineTransform { 59 WTF_MAKE_FAST_ALLOCATED; 60 public: 61 typedef double Transform[6]; 62 63 AffineTransform(); 64 AffineTransform(double a, double b, double c, double d, double e, double f); 65 66 void setMatrix(double a, double b, double c, double d, double e, double f); 67 68 void map(double x, double y, double& x2, double& y2) const; 69 70 // Rounds the mapped point to the nearest integer value. 71 IntPoint mapPoint(const IntPoint&) const; 72 73 FloatPoint mapPoint(const FloatPoint&) const; 74 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; 78 79 FloatRect mapRect(const FloatRect&) const; 80 FloatQuad mapQuad(const FloatQuad&) const; 81 82 bool isIdentity() const; 83 a()84 double a() const { return m_transform[0]; } setA(double a)85 void setA(double a) { m_transform[0] = a; } b()86 double b() const { return m_transform[1]; } setB(double b)87 void setB(double b) { m_transform[1] = b; } c()88 double c() const { return m_transform[2]; } setC(double c)89 void setC(double c) { m_transform[2] = c; } d()90 double d() const { return m_transform[3]; } setD(double d)91 void setD(double d) { m_transform[3] = d; } e()92 double e() const { return m_transform[4]; } setE(double e)93 void setE(double e) { m_transform[4] = e; } f()94 double f() const { return m_transform[5]; } setF(double f)95 void setF(double f) { m_transform[5] = f; } 96 97 void makeIdentity(); 98 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); 112 113 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 isIdentityOrTranslation()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 isIdentityOrTranslationOrFlipped()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 operator== (const AffineTransform& m2) const 135 { 136 return (m_transform[0] == m2.m_transform[0] 137 && m_transform[1] == m2.m_transform[1] 138 && m_transform[2] == m2.m_transform[2] 139 && m_transform[3] == m2.m_transform[3] 140 && m_transform[4] == m2.m_transform[4] 141 && m_transform[5] == m2.m_transform[5]); 142 } 143 144 bool operator!=(const AffineTransform& other) const { return !(*this == other); } 145 146 // *this = *this * t (i.e., a multRight) 147 AffineTransform& operator*=(const AffineTransform& t) 148 { 149 return multiply(t); 150 } 151 152 // result = *this * t (i.e., a multRight) 153 AffineTransform operator*(const AffineTransform& t) const 154 { 155 AffineTransform result = *this; 156 result *= t; 157 return result; 158 } 159 160 #if USE(CG) 161 operator CGAffineTransform() const; 162 #elif USE(CAIRO) 163 operator cairo_matrix_t() const; 164 #elif PLATFORM(OPENVG) 165 operator VGMatrix() const; 166 #elif PLATFORM(QT) 167 operator QTransform() const; 168 #elif USE(SKIA) 169 operator SkMatrix() const; 170 #elif PLATFORM(WX) && USE(WXGC) 171 operator wxGraphicsMatrix() const; 172 #endif 173 translation(double x,double y)174 static AffineTransform translation(double x, double y) 175 { 176 return AffineTransform(1, 0, 0, 1, x, y); 177 } 178 179 private: setMatrix(const Transform m)180 void setMatrix(const Transform m) 181 { 182 if (m && m != m_transform) 183 memcpy(m_transform, m, sizeof(Transform)); 184 } 185 186 Transform m_transform; 187 }; 188 189 AffineTransform makeMapBetweenRects(const FloatRect& source, const FloatRect& dest); 190 191 } 192 193 #endif 194