/usr/include/freetype2/freetype/fttrigon.h is in libfreetype6-dev 2.6.1-0.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 | /***************************************************************************/
/* */
/* fttrigon.h */
/* */
/* FreeType trigonometric functions (specification). */
/* */
/* Copyright 2001-2015 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 FT_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 `value2-value1'.
*
*/
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 */
|