1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/ft2static/freetype/fttrigon.h	Sat Feb 01 19:58:19 2014 +0200
     1.3 @@ -0,0 +1,350 @@
     1.4 +/***************************************************************************/
     1.5 +/*                                                                         */
     1.6 +/*  fttrigon.h                                                             */
     1.7 +/*                                                                         */
     1.8 +/*    FreeType trigonometric functions (specification).                    */
     1.9 +/*                                                                         */
    1.10 +/*  Copyright 2001, 2003, 2005, 2007 by                                    */
    1.11 +/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
    1.12 +/*                                                                         */
    1.13 +/*  This file is part of the FreeType project, and may only be used,       */
    1.14 +/*  modified, and distributed under the terms of the FreeType project      */
    1.15 +/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
    1.16 +/*  this file you indicate that you have read the license and              */
    1.17 +/*  understand and accept it fully.                                        */
    1.18 +/*                                                                         */
    1.19 +/***************************************************************************/
    1.20 +
    1.21 +
    1.22 +#ifndef __FTTRIGON_H__
    1.23 +#define __FTTRIGON_H__
    1.24 +
    1.25 +#include FT_FREETYPE_H
    1.26 +
    1.27 +#ifdef FREETYPE_H
    1.28 +#error "freetype.h of FreeType 1 has been loaded!"
    1.29 +#error "Please fix the directory search order for header files"
    1.30 +#error "so that freetype.h of FreeType 2 is found first."
    1.31 +#endif
    1.32 +
    1.33 +
    1.34 +FT_BEGIN_HEADER
    1.35 +
    1.36 +
    1.37 +  /*************************************************************************/
    1.38 +  /*                                                                       */
    1.39 +  /* <Section>                                                             */
    1.40 +  /*   computations                                                        */
    1.41 +  /*                                                                       */
    1.42 +  /*************************************************************************/
    1.43 +
    1.44 +
    1.45 +  /*************************************************************************
    1.46 +   *
    1.47 +   * @type:
    1.48 +   *   FT_Angle
    1.49 +   *
    1.50 +   * @description:
    1.51 +   *   This type is used to model angle values in FreeType.  Note that the
    1.52 +   *   angle is a 16.16 fixed float value expressed in degrees.
    1.53 +   *
    1.54 +   */
    1.55 +  typedef FT_Fixed  FT_Angle;
    1.56 +
    1.57 +
    1.58 +  /*************************************************************************
    1.59 +   *
    1.60 +   * @macro:
    1.61 +   *   FT_ANGLE_PI
    1.62 +   *
    1.63 +   * @description:
    1.64 +   *   The angle pi expressed in @FT_Angle units.
    1.65 +   *
    1.66 +   */
    1.67 +#define FT_ANGLE_PI  ( 180L << 16 )
    1.68 +
    1.69 +
    1.70 +  /*************************************************************************
    1.71 +   *
    1.72 +   * @macro:
    1.73 +   *   FT_ANGLE_2PI
    1.74 +   *
    1.75 +   * @description:
    1.76 +   *   The angle 2*pi expressed in @FT_Angle units.
    1.77 +   *
    1.78 +   */
    1.79 +#define FT_ANGLE_2PI  ( FT_ANGLE_PI * 2 )
    1.80 +
    1.81 +
    1.82 +  /*************************************************************************
    1.83 +   *
    1.84 +   * @macro:
    1.85 +   *   FT_ANGLE_PI2
    1.86 +   *
    1.87 +   * @description:
    1.88 +   *   The angle pi/2 expressed in @FT_Angle units.
    1.89 +   *
    1.90 +   */
    1.91 +#define FT_ANGLE_PI2  ( FT_ANGLE_PI / 2 )
    1.92 +
    1.93 +
    1.94 +  /*************************************************************************
    1.95 +   *
    1.96 +   * @macro:
    1.97 +   *   FT_ANGLE_PI4
    1.98 +   *
    1.99 +   * @description:
   1.100 +   *   The angle pi/4 expressed in @FT_Angle units.
   1.101 +   *
   1.102 +   */
   1.103 +#define FT_ANGLE_PI4  ( FT_ANGLE_PI / 4 )
   1.104 +
   1.105 +
   1.106 +  /*************************************************************************
   1.107 +   *
   1.108 +   * @function:
   1.109 +   *   FT_Sin
   1.110 +   *
   1.111 +   * @description:
   1.112 +   *   Return the sinus of a given angle in fixed point format.
   1.113 +   *
   1.114 +   * @input:
   1.115 +   *   angle ::
   1.116 +   *     The input angle.
   1.117 +   *
   1.118 +   * @return:
   1.119 +   *   The sinus value.
   1.120 +   *
   1.121 +   * @note:
   1.122 +   *   If you need both the sinus and cosinus for a given angle, use the
   1.123 +   *   function @FT_Vector_Unit.
   1.124 +   *
   1.125 +   */
   1.126 +  FT_EXPORT( FT_Fixed )
   1.127 +  FT_Sin( FT_Angle  angle );
   1.128 +
   1.129 +
   1.130 +  /*************************************************************************
   1.131 +   *
   1.132 +   * @function:
   1.133 +   *   FT_Cos
   1.134 +   *
   1.135 +   * @description:
   1.136 +   *   Return the cosinus of a given angle in fixed point format.
   1.137 +   *
   1.138 +   * @input:
   1.139 +   *   angle ::
   1.140 +   *     The input angle.
   1.141 +   *
   1.142 +   * @return:
   1.143 +   *   The cosinus value.
   1.144 +   *
   1.145 +   * @note:
   1.146 +   *   If you need both the sinus and cosinus for a given angle, use the
   1.147 +   *   function @FT_Vector_Unit.
   1.148 +   *
   1.149 +   */
   1.150 +  FT_EXPORT( FT_Fixed )
   1.151 +  FT_Cos( FT_Angle  angle );
   1.152 +
   1.153 +
   1.154 +  /*************************************************************************
   1.155 +   *
   1.156 +   * @function:
   1.157 +   *   FT_Tan
   1.158 +   *
   1.159 +   * @description:
   1.160 +   *   Return the tangent of a given angle in fixed point format.
   1.161 +   *
   1.162 +   * @input:
   1.163 +   *   angle ::
   1.164 +   *     The input angle.
   1.165 +   *
   1.166 +   * @return:
   1.167 +   *   The tangent value.
   1.168 +   *
   1.169 +   */
   1.170 +  FT_EXPORT( FT_Fixed )
   1.171 +  FT_Tan( FT_Angle  angle );
   1.172 +
   1.173 +
   1.174 +  /*************************************************************************
   1.175 +   *
   1.176 +   * @function:
   1.177 +   *   FT_Atan2
   1.178 +   *
   1.179 +   * @description:
   1.180 +   *   Return the arc-tangent corresponding to a given vector (x,y) in
   1.181 +   *   the 2d plane.
   1.182 +   *
   1.183 +   * @input:
   1.184 +   *   x ::
   1.185 +   *     The horizontal vector coordinate.
   1.186 +   *
   1.187 +   *   y ::
   1.188 +   *     The vertical vector coordinate.
   1.189 +   *
   1.190 +   * @return:
   1.191 +   *   The arc-tangent value (i.e. angle).
   1.192 +   *
   1.193 +   */
   1.194 +  FT_EXPORT( FT_Angle )
   1.195 +  FT_Atan2( FT_Fixed  x,
   1.196 +            FT_Fixed  y );
   1.197 +
   1.198 +
   1.199 +  /*************************************************************************
   1.200 +   *
   1.201 +   * @function:
   1.202 +   *   FT_Angle_Diff
   1.203 +   *
   1.204 +   * @description:
   1.205 +   *   Return the difference between two angles.  The result is always
   1.206 +   *   constrained to the ]-PI..PI] interval.
   1.207 +   *
   1.208 +   * @input:
   1.209 +   *   angle1 ::
   1.210 +   *     First angle.
   1.211 +   *
   1.212 +   *   angle2 ::
   1.213 +   *     Second angle.
   1.214 +   *
   1.215 +   * @return:
   1.216 +   *   Constrained value of `value2-value1'.
   1.217 +   *
   1.218 +   */
   1.219 +  FT_EXPORT( FT_Angle )
   1.220 +  FT_Angle_Diff( FT_Angle  angle1,
   1.221 +                 FT_Angle  angle2 );
   1.222 +
   1.223 +
   1.224 +  /*************************************************************************
   1.225 +   *
   1.226 +   * @function:
   1.227 +   *   FT_Vector_Unit
   1.228 +   *
   1.229 +   * @description:
   1.230 +   *   Return the unit vector corresponding to a given angle.  After the
   1.231 +   *   call, the value of `vec.x' will be `sin(angle)', and the value of
   1.232 +   *   `vec.y' will be `cos(angle)'.
   1.233 +   *
   1.234 +   *   This function is useful to retrieve both the sinus and cosinus of a
   1.235 +   *   given angle quickly.
   1.236 +   *
   1.237 +   * @output:
   1.238 +   *   vec ::
   1.239 +   *     The address of target vector.
   1.240 +   *
   1.241 +   * @input:
   1.242 +   *   angle ::
   1.243 +   *     The address of angle.
   1.244 +   *
   1.245 +   */
   1.246 +  FT_EXPORT( void )
   1.247 +  FT_Vector_Unit( FT_Vector*  vec,
   1.248 +                  FT_Angle    angle );
   1.249 +
   1.250 +
   1.251 +  /*************************************************************************
   1.252 +   *
   1.253 +   * @function:
   1.254 +   *   FT_Vector_Rotate
   1.255 +   *
   1.256 +   * @description:
   1.257 +   *   Rotate a vector by a given angle.
   1.258 +   *
   1.259 +   * @inout:
   1.260 +   *   vec ::
   1.261 +   *     The address of target vector.
   1.262 +   *
   1.263 +   * @input:
   1.264 +   *   angle ::
   1.265 +   *     The address of angle.
   1.266 +   *
   1.267 +   */
   1.268 +  FT_EXPORT( void )
   1.269 +  FT_Vector_Rotate( FT_Vector*  vec,
   1.270 +                    FT_Angle    angle );
   1.271 +
   1.272 +
   1.273 +  /*************************************************************************
   1.274 +   *
   1.275 +   * @function:
   1.276 +   *   FT_Vector_Length
   1.277 +   *
   1.278 +   * @description:
   1.279 +   *   Return the length of a given vector.
   1.280 +   *
   1.281 +   * @input:
   1.282 +   *   vec ::
   1.283 +   *     The address of target vector.
   1.284 +   *
   1.285 +   * @return:
   1.286 +   *   The vector length, expressed in the same units that the original
   1.287 +   *   vector coordinates.
   1.288 +   *
   1.289 +   */
   1.290 +  FT_EXPORT( FT_Fixed )
   1.291 +  FT_Vector_Length( FT_Vector*  vec );
   1.292 +
   1.293 +
   1.294 +  /*************************************************************************
   1.295 +   *
   1.296 +   * @function:
   1.297 +   *   FT_Vector_Polarize
   1.298 +   *
   1.299 +   * @description:
   1.300 +   *   Compute both the length and angle of a given vector.
   1.301 +   *
   1.302 +   * @input:
   1.303 +   *   vec ::
   1.304 +   *     The address of source vector.
   1.305 +   *
   1.306 +   * @output:
   1.307 +   *   length ::
   1.308 +   *     The vector length.
   1.309 +   *
   1.310 +   *   angle ::
   1.311 +   *     The vector angle.
   1.312 +   *
   1.313 +   */
   1.314 +  FT_EXPORT( void )
   1.315 +  FT_Vector_Polarize( FT_Vector*  vec,
   1.316 +                      FT_Fixed   *length,
   1.317 +                      FT_Angle   *angle );
   1.318 +
   1.319 +
   1.320 +  /*************************************************************************
   1.321 +   *
   1.322 +   * @function:
   1.323 +   *   FT_Vector_From_Polar
   1.324 +   *
   1.325 +   * @description:
   1.326 +   *   Compute vector coordinates from a length and angle.
   1.327 +   *
   1.328 +   * @output:
   1.329 +   *   vec ::
   1.330 +   *     The address of source vector.
   1.331 +   *
   1.332 +   * @input:
   1.333 +   *   length ::
   1.334 +   *     The vector length.
   1.335 +   *
   1.336 +   *   angle ::
   1.337 +   *     The vector angle.
   1.338 +   *
   1.339 +   */
   1.340 +  FT_EXPORT( void )
   1.341 +  FT_Vector_From_Polar( FT_Vector*  vec,
   1.342 +                        FT_Fixed    length,
   1.343 +                        FT_Angle    angle );
   1.344 +
   1.345 +  /* */
   1.346 +
   1.347 +
   1.348 +FT_END_HEADER
   1.349 +
   1.350 +#endif /* __FTTRIGON_H__ */
   1.351 +
   1.352 +
   1.353 +/* END */