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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* fttrigon.h */ | |
| 4 /* */ | |
| 5 /* FreeType trigonometric functions (specification). */ | |
| 6 /* */ | |
| 7 /* Copyright 2001, 2003, 2005, 2007, 2013 by */ | |
| 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| 9 /* */ | |
| 10 /* This file is part of the FreeType project, and may only be used, */ | |
| 11 /* modified, and distributed under the terms of the FreeType project */ | |
| 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| 13 /* this file you indicate that you have read the license and */ | |
| 14 /* understand and accept it fully. */ | |
| 15 /* */ | |
| 16 /***************************************************************************/ | |
| 17 | |
| 18 | |
| 19 #ifndef __FTTRIGON_H__ | |
| 20 #define __FTTRIGON_H__ | |
| 21 | |
| 22 #include FT_FREETYPE_H | |
| 23 | |
| 24 #ifdef FREETYPE_H | |
| 25 #error "freetype.h of FreeType 1 has been loaded!" | |
| 26 #error "Please fix the directory search order for header files" | |
| 27 #error "so that freetype.h of FreeType 2 is found first." | |
| 28 #endif | |
| 29 | |
| 30 | |
| 31 FT_BEGIN_HEADER | |
| 32 | |
| 33 | |
| 34 /*************************************************************************/ | |
| 35 /* */ | |
| 36 /* <Section> */ | |
| 37 /* computations */ | |
| 38 /* */ | |
| 39 /*************************************************************************/ | |
| 40 | |
| 41 | |
| 42 /************************************************************************* | |
| 43 * | |
| 44 * @type: | |
| 45 * FT_Angle | |
| 46 * | |
| 47 * @description: | |
| 48 * This type is used to model angle values in FreeType. Note that the | |
| 49 * angle is a 16.16 fixed-point value expressed in degrees. | |
| 50 * | |
| 51 */ | |
| 52 typedef FT_Fixed FT_Angle; | |
| 53 | |
| 54 | |
| 55 /************************************************************************* | |
| 56 * | |
| 57 * @macro: | |
| 58 * FT_ANGLE_PI | |
| 59 * | |
| 60 * @description: | |
| 61 * The angle pi expressed in @FT_Angle units. | |
| 62 * | |
| 63 */ | |
| 64 #define FT_ANGLE_PI ( 180L << 16 ) | |
| 65 | |
| 66 | |
| 67 /************************************************************************* | |
| 68 * | |
| 69 * @macro: | |
| 70 * FT_ANGLE_2PI | |
| 71 * | |
| 72 * @description: | |
| 73 * The angle 2*pi expressed in @FT_Angle units. | |
| 74 * | |
| 75 */ | |
| 76 #define FT_ANGLE_2PI ( FT_ANGLE_PI * 2 ) | |
| 77 | |
| 78 | |
| 79 /************************************************************************* | |
| 80 * | |
| 81 * @macro: | |
| 82 * FT_ANGLE_PI2 | |
| 83 * | |
| 84 * @description: | |
| 85 * The angle pi/2 expressed in @FT_Angle units. | |
| 86 * | |
| 87 */ | |
| 88 #define FT_ANGLE_PI2 ( FT_ANGLE_PI / 2 ) | |
| 89 | |
| 90 | |
| 91 /************************************************************************* | |
| 92 * | |
| 93 * @macro: | |
| 94 * FT_ANGLE_PI4 | |
| 95 * | |
| 96 * @description: | |
| 97 * The angle pi/4 expressed in @FT_Angle units. | |
| 98 * | |
| 99 */ | |
| 100 #define FT_ANGLE_PI4 ( FT_ANGLE_PI / 4 ) | |
| 101 | |
| 102 | |
| 103 /************************************************************************* | |
| 104 * | |
| 105 * @function: | |
| 106 * FT_Sin | |
| 107 * | |
| 108 * @description: | |
| 109 * Return the sinus of a given angle in fixed-point format. | |
| 110 * | |
| 111 * @input: | |
| 112 * angle :: | |
| 113 * The input angle. | |
| 114 * | |
| 115 * @return: | |
| 116 * The sinus value. | |
| 117 * | |
| 118 * @note: | |
| 119 * If you need both the sinus and cosinus for a given angle, use the | |
| 120 * function @FT_Vector_Unit. | |
| 121 * | |
| 122 */ | |
| 123 FT_EXPORT( FT_Fixed ) | |
| 124 FT_Sin( FT_Angle angle ); | |
| 125 | |
| 126 | |
| 127 /************************************************************************* | |
| 128 * | |
| 129 * @function: | |
| 130 * FT_Cos | |
| 131 * | |
| 132 * @description: | |
| 133 * Return the cosinus of a given angle in fixed-point format. | |
| 134 * | |
| 135 * @input: | |
| 136 * angle :: | |
| 137 * The input angle. | |
| 138 * | |
| 139 * @return: | |
| 140 * The cosinus value. | |
| 141 * | |
| 142 * @note: | |
| 143 * If you need both the sinus and cosinus for a given angle, use the | |
| 144 * function @FT_Vector_Unit. | |
| 145 * | |
| 146 */ | |
| 147 FT_EXPORT( FT_Fixed ) | |
| 148 FT_Cos( FT_Angle angle ); | |
| 149 | |
| 150 | |
| 151 /************************************************************************* | |
| 152 * | |
| 153 * @function: | |
| 154 * FT_Tan | |
| 155 * | |
| 156 * @description: | |
| 157 * Return the tangent of a given angle in fixed-point format. | |
| 158 * | |
| 159 * @input: | |
| 160 * angle :: | |
| 161 * The input angle. | |
| 162 * | |
| 163 * @return: | |
| 164 * The tangent value. | |
| 165 * | |
| 166 */ | |
| 167 FT_EXPORT( FT_Fixed ) | |
| 168 FT_Tan( FT_Angle angle ); | |
| 169 | |
| 170 | |
| 171 /************************************************************************* | |
| 172 * | |
| 173 * @function: | |
| 174 * FT_Atan2 | |
| 175 * | |
| 176 * @description: | |
| 177 * Return the arc-tangent corresponding to a given vector (x,y) in | |
| 178 * the 2d plane. | |
| 179 * | |
| 180 * @input: | |
| 181 * x :: | |
| 182 * The horizontal vector coordinate. | |
| 183 * | |
| 184 * y :: | |
| 185 * The vertical vector coordinate. | |
| 186 * | |
| 187 * @return: | |
| 188 * The arc-tangent value (i.e. angle). | |
| 189 * | |
| 190 */ | |
| 191 FT_EXPORT( FT_Angle ) | |
| 192 FT_Atan2( FT_Fixed x, | |
| 193 FT_Fixed y ); | |
| 194 | |
| 195 | |
| 196 /************************************************************************* | |
| 197 * | |
| 198 * @function: | |
| 199 * FT_Angle_Diff | |
| 200 * | |
| 201 * @description: | |
| 202 * Return the difference between two angles. The result is always | |
| 203 * constrained to the ]-PI..PI] interval. | |
| 204 * | |
| 205 * @input: | |
| 206 * angle1 :: | |
| 207 * First angle. | |
| 208 * | |
| 209 * angle2 :: | |
| 210 * Second angle. | |
| 211 * | |
| 212 * @return: | |
| 213 * Constrained value of `value2-value1'. | |
| 214 * | |
| 215 */ | |
| 216 FT_EXPORT( FT_Angle ) | |
| 217 FT_Angle_Diff( FT_Angle angle1, | |
| 218 FT_Angle angle2 ); | |
| 219 | |
| 220 | |
| 221 /************************************************************************* | |
| 222 * | |
| 223 * @function: | |
| 224 * FT_Vector_Unit | |
| 225 * | |
| 226 * @description: | |
| 227 * Return the unit vector corresponding to a given angle. After the | |
| 228 * call, the value of `vec.x' will be `sin(angle)', and the value of | |
| 229 * `vec.y' will be `cos(angle)'. | |
| 230 * | |
| 231 * This function is useful to retrieve both the sinus and cosinus of a | |
| 232 * given angle quickly. | |
| 233 * | |
| 234 * @output: | |
| 235 * vec :: | |
| 236 * The address of target vector. | |
| 237 * | |
| 238 * @input: | |
| 239 * angle :: | |
| 240 * The input angle. | |
| 241 * | |
| 242 */ | |
| 243 FT_EXPORT( void ) | |
| 244 FT_Vector_Unit( FT_Vector* vec, | |
| 245 FT_Angle angle ); | |
| 246 | |
| 247 | |
| 248 /************************************************************************* | |
| 249 * | |
| 250 * @function: | |
| 251 * FT_Vector_Rotate | |
| 252 * | |
| 253 * @description: | |
| 254 * Rotate a vector by a given angle. | |
| 255 * | |
| 256 * @inout: | |
| 257 * vec :: | |
| 258 * The address of target vector. | |
| 259 * | |
| 260 * @input: | |
| 261 * angle :: | |
| 262 * The input angle. | |
| 263 * | |
| 264 */ | |
| 265 FT_EXPORT( void ) | |
| 266 FT_Vector_Rotate( FT_Vector* vec, | |
| 267 FT_Angle angle ); | |
| 268 | |
| 269 | |
| 270 /************************************************************************* | |
| 271 * | |
| 272 * @function: | |
| 273 * FT_Vector_Length | |
| 274 * | |
| 275 * @description: | |
| 276 * Return the length of a given vector. | |
| 277 * | |
| 278 * @input: | |
| 279 * vec :: | |
| 280 * The address of target vector. | |
| 281 * | |
| 282 * @return: | |
| 283 * The vector length, expressed in the same units that the original | |
| 284 * vector coordinates. | |
| 285 * | |
| 286 */ | |
| 287 FT_EXPORT( FT_Fixed ) | |
| 288 FT_Vector_Length( FT_Vector* vec ); | |
| 289 | |
| 290 | |
| 291 /************************************************************************* | |
| 292 * | |
| 293 * @function: | |
| 294 * FT_Vector_Polarize | |
| 295 * | |
| 296 * @description: | |
| 297 * Compute both the length and angle of a given vector. | |
| 298 * | |
| 299 * @input: | |
| 300 * vec :: | |
| 301 * The address of source vector. | |
| 302 * | |
| 303 * @output: | |
| 304 * length :: | |
| 305 * The vector length. | |
| 306 * | |
| 307 * angle :: | |
| 308 * The vector angle. | |
| 309 * | |
| 310 */ | |
| 311 FT_EXPORT( void ) | |
| 312 FT_Vector_Polarize( FT_Vector* vec, | |
| 313 FT_Fixed *length, | |
| 314 FT_Angle *angle ); | |
| 315 | |
| 316 | |
| 317 /************************************************************************* | |
| 318 * | |
| 319 * @function: | |
| 320 * FT_Vector_From_Polar | |
| 321 * | |
| 322 * @description: | |
| 323 * Compute vector coordinates from a length and angle. | |
| 324 * | |
| 325 * @output: | |
| 326 * vec :: | |
| 327 * The address of source vector. | |
| 328 * | |
| 329 * @input: | |
| 330 * length :: | |
| 331 * The vector length. | |
| 332 * | |
| 333 * angle :: | |
| 334 * The vector angle. | |
| 335 * | |
| 336 */ | |
| 337 FT_EXPORT( void ) | |
| 338 FT_Vector_From_Polar( FT_Vector* vec, | |
| 339 FT_Fixed length, | |
| 340 FT_Angle angle ); | |
| 341 | |
| 342 /* */ | |
| 343 | |
| 344 | |
| 345 FT_END_HEADER | |
| 346 | |
| 347 #endif /* __FTTRIGON_H__ */ | |
| 348 | |
| 349 | |
| 350 /* END */ | |
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Chromium Code Reviews
Issue 1413673003:
Update bundled freetype to 2.6.1 (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master