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/usr/include/freetype2/freetype

Name	Size	Mode	Actions
config/	-	0755	rm
freetype.h	165119	0644	edit dl rm
ftadvanc.h	5470	0644	edit dl rm
ftbbox.h	2638	0644	edit dl rm
ftbdf.h	5322	0644	edit dl rm
ftbitmap.h	9051	0644	edit dl rm
ftbzip2.h	2786	0644	edit dl rm
ftcache.h	33858	0644	edit dl rm
ftchapters.h	2510	0644	edit dl rm
ftcid.h	4022	0644	edit dl rm
ftcolor.h	8913	0644	edit dl rm
ftdriver.h	47220	0644	edit dl rm
fterrdef.h	12336	0644	edit dl rm
fterrors.h	9291	0644	edit dl rm
ftfntfmt.h	2213	0644	edit dl rm
ftgasp.h	4138	0644	edit dl rm
ftglyph.h	18491	0644	edit dl rm
ftgxval.h	10625	0644	edit dl rm
ftgzip.h	4211	0644	edit dl rm
ftimage.h	39895	0644	edit dl rm
ftincrem.h	10310	0644	edit dl rm
ftlcdfil.h	11739	0644	edit dl rm
ftlist.h	7100	0644	edit dl rm
ftlzw.h	2768	0644	edit dl rm
ftmac.h	7771	0644	edit dl rm
ftmm.h	21793	0644	edit dl rm
ftmodapi.h	21777	0644	edit dl rm
ftmoderr.h	6601	0644	edit dl rm
ftotval.h	5346	0644	edit dl rm
ftoutln.h	17870	0644	edit dl rm
ftparams.h	5592	0644	edit dl rm
ftpfr.h	4910	0644	edit dl rm
ftrender.h	6625	0644	edit dl rm
ftsizes.h	4288	0644	edit dl rm
ftsnames.h	7730	0644	edit dl rm
ftstroke.h	21773	0644	edit dl rm
ftsynth.h	3362	0644	edit dl rm
ftsystem.h	8518	0644	edit dl rm
fttrigon.h	7411	0644	edit dl rm
fttypes.h	14487	0644	edit dl rm
ftwinfnt.h	7966	0644	edit dl rm
t1tables.h	22829	0644	edit dl rm
ttnameid.h	58769	0644	edit dl rm
tttables.h	25231	0644	edit dl rm
tttags.h	5092	0644	edit dl rm

Edit: /usr/include/freetype2/freetype/fttrigon.h (7411B)

/****************************************************************************
 *
 * fttrigon.h
 *
 *   FreeType trigonometric functions (specification).
 *
 * Copyright (C) 2001-2020 by
 * David Turner, Robert Wilhelm, and Werner Lemberg.
 *
 * This file is part of the FreeType project, and may only be used,
 * modified, and distributed under the terms of the FreeType project
 * license, LICENSE.TXT.  By continuing to use, modify, or distribute
 * this file you indicate that you have read the license and
 * understand and accept it fully.
 *
 */

#ifndef FTTRIGON_H_
#define FTTRIGON_H_

#include <freetype/freetype.h>

#ifdef FREETYPE_H
#error "freetype.h of FreeType 1 has been loaded!"
#error "Please fix the directory search order for header files"
#error "so that freetype.h of FreeType 2 is found first."
#endif

FT_BEGIN_HEADER

/**************************************************************************
   *
   * @section:
   *  computations
   *
   */

/**************************************************************************
   *
   * @type:
   *   FT_Angle
   *
   * @description:
   *   This type is used to model angle values in FreeType.  Note that the
   *   angle is a 16.16 fixed-point value expressed in degrees.
   *
   */
  typedef FT_Fixed  FT_Angle;

/**************************************************************************
   *
   * @macro:
   *   FT_ANGLE_PI
   *
   * @description:
   *   The angle pi expressed in @FT_Angle units.
   *
   */
#define FT_ANGLE_PI  ( 180L << 16 )

/**************************************************************************
   *
   * @macro:
   *   FT_ANGLE_2PI
   *
   * @description:
   *   The angle 2*pi expressed in @FT_Angle units.
   *
   */
#define FT_ANGLE_2PI  ( FT_ANGLE_PI * 2 )

/**************************************************************************
   *
   * @macro:
   *   FT_ANGLE_PI2
   *
   * @description:
   *   The angle pi/2 expressed in @FT_Angle units.
   *
   */
#define FT_ANGLE_PI2  ( FT_ANGLE_PI / 2 )

/**************************************************************************
   *
   * @macro:
   *   FT_ANGLE_PI4
   *
   * @description:
   *   The angle pi/4 expressed in @FT_Angle units.
   *
   */
#define FT_ANGLE_PI4  ( FT_ANGLE_PI / 4 )

/**************************************************************************
   *
   * @function:
   *   FT_Sin
   *
   * @description:
   *   Return the sinus of a given angle in fixed-point format.
   *
   * @input:
   *   angle ::
   *     The input angle.
   *
   * @return:
   *   The sinus value.
   *
   * @note:
   *   If you need both the sinus and cosinus for a given angle, use the
   *   function @FT_Vector_Unit.
   *
   */
  FT_EXPORT( FT_Fixed )
  FT_Sin( FT_Angle  angle );

/**************************************************************************
   *
   * @function:
   *   FT_Cos
   *
   * @description:
   *   Return the cosinus of a given angle in fixed-point format.
   *
   * @input:
   *   angle ::
   *     The input angle.
   *
   * @return:
   *   The cosinus value.
   *
   * @note:
   *   If you need both the sinus and cosinus for a given angle, use the
   *   function @FT_Vector_Unit.
   *
   */
  FT_EXPORT( FT_Fixed )
  FT_Cos( FT_Angle  angle );

/**************************************************************************
   *
   * @function:
   *   FT_Tan
   *
   * @description:
   *   Return the tangent of a given angle in fixed-point format.
   *
   * @input:
   *   angle ::
   *     The input angle.
   *
   * @return:
   *   The tangent value.
   *
   */
  FT_EXPORT( FT_Fixed )
  FT_Tan( FT_Angle  angle );

/**************************************************************************
   *
   * @function:
   *   FT_Atan2
   *
   * @description:
   *   Return the arc-tangent corresponding to a given vector (x,y) in the 2d
   *   plane.
   *
   * @input:
   *   x ::
   *     The horizontal vector coordinate.
   *
   *   y ::
   *     The vertical vector coordinate.
   *
   * @return:
   *   The arc-tangent value (i.e. angle).
   *
   */
  FT_EXPORT( FT_Angle )
  FT_Atan2( FT_Fixed  x,
            FT_Fixed  y );

/**************************************************************************
   *
   * @function:
   *   FT_Angle_Diff
   *
   * @description:
   *   Return the difference between two angles.  The result is always
   *   constrained to the ]-PI..PI] interval.
   *
   * @input:
   *   angle1 ::
   *     First angle.
   *
   *   angle2 ::
   *     Second angle.
   *
   * @return:
   *   Constrained value of `angle2-angle1`.
   *
   */
  FT_EXPORT( FT_Angle )
  FT_Angle_Diff( FT_Angle  angle1,
                 FT_Angle  angle2 );

/**************************************************************************
   *
   * @function:
   *   FT_Vector_Unit
   *
   * @description:
   *   Return the unit vector corresponding to a given angle.  After the
   *   call, the value of `vec.x` will be `cos(angle)`, and the value of
   *   `vec.y` will be `sin(angle)`.
   *
   *   This function is useful to retrieve both the sinus and cosinus of a
   *   given angle quickly.
   *
   * @output:
   *   vec ::
   *     The address of target vector.
   *
   * @input:
   *   angle ::
   *     The input angle.
   *
   */
  FT_EXPORT( void )
  FT_Vector_Unit( FT_Vector*  vec,
                  FT_Angle    angle );

/**************************************************************************
   *
   * @function:
   *   FT_Vector_Rotate
   *
   * @description:
   *   Rotate a vector by a given angle.
   *
   * @inout:
   *   vec ::
   *     The address of target vector.
   *
   * @input:
   *   angle ::
   *     The input angle.
   *
   */
  FT_EXPORT( void )
  FT_Vector_Rotate( FT_Vector*  vec,
                    FT_Angle    angle );

/**************************************************************************
   *
   * @function:
   *   FT_Vector_Length
   *
   * @description:
   *   Return the length of a given vector.
   *
   * @input:
   *   vec ::
   *     The address of target vector.
   *
   * @return:
   *   The vector length, expressed in the same units that the original
   *   vector coordinates.
   *
   */
  FT_EXPORT( FT_Fixed )
  FT_Vector_Length( FT_Vector*  vec );

/**************************************************************************
   *
   * @function:
   *   FT_Vector_Polarize
   *
   * @description:
   *   Compute both the length and angle of a given vector.
   *
   * @input:
   *   vec ::
   *     The address of source vector.
   *
   * @output:
   *   length ::
   *     The vector length.
   *
   *   angle ::
   *     The vector angle.
   *
   */
  FT_EXPORT( void )
  FT_Vector_Polarize( FT_Vector*  vec,
                      FT_Fixed   *length,
                      FT_Angle   *angle );

/**************************************************************************
   *
   * @function:
   *   FT_Vector_From_Polar
   *
   * @description:
   *   Compute vector coordinates from a length and angle.
   *
   * @output:
   *   vec ::
   *     The address of source vector.
   *
   * @input:
   *   length ::
   *     The vector length.
   *
   *   angle ::
   *     The vector angle.
   *
   */
  FT_EXPORT( void )
  FT_Vector_From_Polar( FT_Vector*  vec,
                        FT_Fixed    length,
                        FT_Angle    angle );

/* */

FT_END_HEADER

#endif /* FTTRIGON_H_ */

/* END */

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