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      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 "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 
     84     double a() const { return m_transform[0]; }
     85     void setA(double a) { m_transform[0] = a; }
     86     double b() const { return m_transform[1]; }
     87     void setB(double b) { m_transform[1] = b; }
     88     double c() const { return m_transform[2]; }
     89     void setC(double c) { m_transform[2] = c; }
     90     double d() const { return m_transform[3]; }
     91     void setD(double d) { m_transform[3] = d; }
     92     double e() const { return m_transform[4]; }
     93     void setE(double e) { m_transform[4] = e; }
     94     double f() const { return m_transform[5]; }
     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 
    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 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 
    174     static AffineTransform translation(double x, double y)
    175     {
    176         return AffineTransform(1, 0, 0, 1, x, y);
    177     }
    178 
    179 private:
    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