doc/fcmatrix.fncs

   1 /*
   2  * fontconfig/doc/fcmatrix.fncs
   3  *
   4  * Copyright © 2003 Keith Packard
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that
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  10  * documentation, and that the name of the author(s) not be used in
  11  * advertising or publicity pertaining to distribution of the software without
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  14  * is provided "as is" without express or implied warranty.
  15  *
  16  * THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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  24
  25 @RET@           void
  26 @FUNC@          FcMatrixInit
  27 @PURPOSE@       initialize an FcMatrix structure
  28 @TYPE1@         FcMatrix *
  29 @ARG1@          matrix
  30 @DESC@
  31 <function>FcMatrixInit</function> initializes <parameter>matrix</parameter>
  32 to the identity matrix.
  33 @@
  34
  35 @FUNC@          FcMatrixCopy
  36 @PURPOSE@       Copy a matrix
  37 @TYPE1@         const FcMatrix *
  38 @ARG1@          matrix
  39 @DESC@
  40 <function>FcMatrixCopy</function> allocates a new FcMatrix
  41 and copies <parameter>mat</parameter> into it.
  42 @@
  43
  44 @FUNC@          FcMatrixEqual
  45 @PURPOSE@       Compare two matrices
  46 @TYPE1@         const FcMatrix *
  47 @ARG1@          matrix1
  48 @TYPE2@         const FcMatrix *
  49 @ARG2@          matrix2
  50 @DESC@
  51 <function>FcMatrixEqual</function> compares <parameter>matrix1</parameter>
  52 and <parameter>matrix2</parameter> returning FcTrue when they are equal and
  53 FcFalse when they are not.
  54 @@
  55
  56 @FUNC@          FcMatrixMultiply
  57 @PURPOSE@       Multiply matrices
  58 @TYPE1@         FcMatrix *
  59 @ARG1@          result
  60 @TYPE2@         const FcMatrix *
  61 @ARG2@          matrix1
  62 @TYPE3@         const FcMatrix *
  63 @ARG3@          matrix2
  64 @DESC@
  65 <function>FcMatrixMultiply</function> multiplies
  66 <parameter>matrix1</parameter> and <parameter>matrix2</parameter> storing
  67 the result in <parameter>result</parameter>.
  68 @@
  69
  70 @FUNC@          FcMatrixRotate
  71 @PURPOSE@       Rotate a matrix
  72 @TYPE1@         FcMatrix *
  73 @ARG1@          matrix
  74 @TYPE2@         double%
  75 @ARG2@          cos
  76 @TYPE3@         double%
  77 @ARG3@          sin
  78 @DESC@
  79 <function>FcMatrixRotate</function> rotates <parameter>matrix</parameter>
  80 by the angle who's sine is <parameter>sin</parameter> and cosine is
  81 <parameter>cos</parameter>.  This is done by multiplying by the
  82 matrix:
  83 <programlisting>
  84   cos -sin
  85   sin  cos
  86 </programlisting>
  87 @@
  88
  89 @FUNC@          FcMatrixScale
  90 @PURPOSE@       Scale a matrix
  91 @TYPE1@         FcMatrix *
  92 @ARG1@          matrix
  93 @TYPE2@         double%
  94 @ARG2@          sx
  95 @TYPE3@         double%
  96 @ARG3@          dy
  97 @DESC@
  98 <function>FcMatrixScale</function> multiplies <parameter>matrix</parameter>
  99 x values by <parameter>sx</parameter> and y values by
 100 <parameter>sy</parameter>.  This is done by multiplying by
 101 the matrix:
 102 <programlisting>
 103    sx  0
 104    0   sy
 105 </programlisting>
 106 @@
 107
 108 @FUNC@          FcMatrixShear
 109 @PURPOSE@       Shear a matrix
 110 @TYPE1@         FcMatrix *
 111 @ARG1@          matrix
 112 @TYPE2@         double%
 113 @ARG2@          sh
 114 @TYPE3@         double%
 115 @ARG3@          sv
 116 @DESC@
 117 <function>FcMatrixShare</function> shears <parameter>matrix</parameter>
 118 horizontally by <parameter>sh</parameter> and vertically by
 119 <parameter>sv</parameter>.  This is done by multiplying by
 120 the matrix:
 121 <programlisting>
 122   1  sh
 123   sv  1
 124 </programlisting>
 125 @@