src/hb-font.h

   1 /*
   2  * Copyright © 2009  Red Hat, Inc.
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  *
  24  * Red Hat Author(s): Behdad Esfahbod
  25  */
  26
  27 #ifndef HB_H_IN
  28 #error "Include <hb.h> instead."
  29 #endif
  30
  31 #ifndef HB_FONT_H
  32 #define HB_FONT_H
  33
  34 #include "hb-common.h"
  35 #include "hb-face.h"
  36
  37 HB_BEGIN_DECLS
  38
  39
  40 typedef struct hb_font_t hb_font_t;
  41
  42
  43 /*
  44  * hb_font_funcs_t
  45  */
  46
  47 typedef struct hb_font_funcs_t hb_font_funcs_t;
  48
  49 hb_font_funcs_t *
  50 hb_font_funcs_create (void);
  51
  52 hb_font_funcs_t *
  53 hb_font_funcs_get_empty (void);
  54
  55 hb_font_funcs_t *
  56 hb_font_funcs_reference (hb_font_funcs_t *ffuncs);
  57
  58 void
  59 hb_font_funcs_destroy (hb_font_funcs_t *ffuncs);
  60
  61 hb_bool_t
  62 hb_font_funcs_set_user_data (hb_font_funcs_t    *ffuncs,
  63                              hb_user_data_key_t *key,
  64                              void *              data,
  65                              hb_destroy_func_t   destroy,
  66                              hb_bool_t           replace);
  67
  68
  69 void *
  70 hb_font_funcs_get_user_data (hb_font_funcs_t    *ffuncs,
  71                              hb_user_data_key_t *key);
  72
  73
  74 void
  75 hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs);
  76
  77 hb_bool_t
  78 hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs);
  79
  80
  81 /* glyph extents */
  82
  83 typedef struct hb_glyph_extents_t
  84 {
  85   hb_position_t x_bearing;
  86   hb_position_t y_bearing;
  87   hb_position_t width;
  88   hb_position_t height;
  89 } hb_glyph_extents_t;
  90
  91
  92 /* func types */
  93
  94 typedef hb_bool_t (*hb_font_get_glyph_func_t) (hb_font_t *font, void *font_data,
  95                                                hb_codepoint_t unicode, hb_codepoint_t variation_selector,
  96                                                hb_codepoint_t *glyph,
  97                                                void *user_data);
  98
  99
 100 typedef hb_position_t (*hb_font_get_glyph_advance_func_t) (hb_font_t *font, void *font_data,
 101                                                            hb_codepoint_t glyph,
 102                                                            void *user_data);
 103 typedef hb_font_get_glyph_advance_func_t hb_font_get_glyph_h_advance_func_t;
 104 typedef hb_font_get_glyph_advance_func_t hb_font_get_glyph_v_advance_func_t;
 105
 106 typedef hb_bool_t (*hb_font_get_glyph_origin_func_t) (hb_font_t *font, void *font_data,
 107                                                       hb_codepoint_t glyph,
 108                                                       hb_position_t *x, hb_position_t *y,
 109                                                       void *user_data);
 110 typedef hb_font_get_glyph_origin_func_t hb_font_get_glyph_h_origin_func_t;
 111 typedef hb_font_get_glyph_origin_func_t hb_font_get_glyph_v_origin_func_t;
 112
 113 typedef hb_position_t (*hb_font_get_glyph_kerning_func_t) (hb_font_t *font, void *font_data,
 114                                                            hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
 115                                                            void *user_data);
 116 typedef hb_font_get_glyph_kerning_func_t hb_font_get_glyph_h_kerning_func_t;
 117 typedef hb_font_get_glyph_kerning_func_t hb_font_get_glyph_v_kerning_func_t;
 118
 119
 120 typedef hb_bool_t (*hb_font_get_glyph_extents_func_t) (hb_font_t *font, void *font_data,
 121                                                        hb_codepoint_t glyph,
 122                                                        hb_glyph_extents_t *extents,
 123                                                        void *user_data);
 124 typedef hb_bool_t (*hb_font_get_glyph_contour_point_func_t) (hb_font_t *font, void *font_data,
 125                                                              hb_codepoint_t glyph, unsigned int point_index,
 126                                                              hb_position_t *x, hb_position_t *y,
 127                                                              void *user_data);
 128
 129
 130 typedef hb_bool_t (*hb_font_get_glyph_name_func_t) (hb_font_t *font, void *font_data,
 131                                                     hb_codepoint_t glyph,
 132                                                     char *name, unsigned int size,
 133                                                     void *user_data);
 134 typedef hb_bool_t (*hb_font_get_glyph_from_name_func_t) (hb_font_t *font, void *font_data,
 135                                                          const char *name, int len, /* -1 means nul-terminated */
 136                                                          hb_codepoint_t *glyph,
 137                                                          void *user_data);
 138
 139
 140 /* func setters */
 141
 142 /**
 143  * hb_font_funcs_set_glyph_func:
 144  * @ffuncs: font functions.
 145  * @func: (closure user_data) (destroy destroy) (scope notified):
 146  * @user_data:
 147  * @destroy:
 148  *
 149  *
 150  *
 151  * Since: 1.0
 152  **/
 153 void
 154 hb_font_funcs_set_glyph_func (hb_font_funcs_t *ffuncs,
 155                               hb_font_get_glyph_func_t func,
 156                               void *user_data, hb_destroy_func_t destroy);
 157
 158 /**
 159  * hb_font_funcs_set_glyph_h_advance_func:
 160  * @ffuncs: font functions.
 161  * @func: (closure user_data) (destroy destroy) (scope notified):
 162  * @user_data:
 163  * @destroy:
 164  *
 165  *
 166  *
 167  * Since: 1.0
 168  **/
 169 void
 170 hb_font_funcs_set_glyph_h_advance_func (hb_font_funcs_t *ffuncs,
 171                                         hb_font_get_glyph_h_advance_func_t func,
 172                                         void *user_data, hb_destroy_func_t destroy);
 173
 174 /**
 175  * hb_font_funcs_set_glyph_v_advance_func:
 176  * @ffuncs: font functions.
 177  * @func: (closure user_data) (destroy destroy) (scope notified):
 178  * @user_data:
 179  * @destroy:
 180  *
 181  *
 182  *
 183  * Since: 1.0
 184  **/
 185 void
 186 hb_font_funcs_set_glyph_v_advance_func (hb_font_funcs_t *ffuncs,
 187                                         hb_font_get_glyph_v_advance_func_t func,
 188                                         void *user_data, hb_destroy_func_t destroy);
 189
 190 /**
 191  * hb_font_funcs_set_glyph_h_origin_func:
 192  * @ffuncs: font functions.
 193  * @func: (closure user_data) (destroy destroy) (scope notified):
 194  * @user_data:
 195  * @destroy:
 196  *
 197  *
 198  *
 199  * Since: 1.0
 200  **/
 201 void
 202 hb_font_funcs_set_glyph_h_origin_func (hb_font_funcs_t *ffuncs,
 203                                        hb_font_get_glyph_h_origin_func_t func,
 204                                        void *user_data, hb_destroy_func_t destroy);
 205
 206 /**
 207  * hb_font_funcs_set_glyph_v_origin_func:
 208  * @ffuncs: font functions.
 209  * @func: (closure user_data) (destroy destroy) (scope notified):
 210  * @user_data:
 211  * @destroy:
 212  *
 213  *
 214  *
 215  * Since: 1.0
 216  **/
 217 void
 218 hb_font_funcs_set_glyph_v_origin_func (hb_font_funcs_t *ffuncs,
 219                                        hb_font_get_glyph_v_origin_func_t func,
 220                                        void *user_data, hb_destroy_func_t destroy);
 221
 222 /**
 223  * hb_font_funcs_set_glyph_h_kerning_func:
 224  * @ffuncs: font functions.
 225  * @func: (closure user_data) (destroy destroy) (scope notified):
 226  * @user_data:
 227  * @destroy:
 228  *
 229  *
 230  *
 231  * Since: 1.0
 232  **/
 233 void
 234 hb_font_funcs_set_glyph_h_kerning_func (hb_font_funcs_t *ffuncs,
 235                                         hb_font_get_glyph_h_kerning_func_t func,
 236                                         void *user_data, hb_destroy_func_t destroy);
 237
 238 /**
 239  * hb_font_funcs_set_glyph_v_kerning_func:
 240  * @ffuncs: font functions.
 241  * @func: (closure user_data) (destroy destroy) (scope notified):
 242  * @user_data:
 243  * @destroy:
 244  *
 245  *
 246  *
 247  * Since: 1.0
 248  **/
 249 void
 250 hb_font_funcs_set_glyph_v_kerning_func (hb_font_funcs_t *ffuncs,
 251                                         hb_font_get_glyph_v_kerning_func_t func,
 252                                         void *user_data, hb_destroy_func_t destroy);
 253
 254 /**
 255  * hb_font_funcs_set_glyph_extents_func:
 256  * @ffuncs: font functions.
 257  * @func: (closure user_data) (destroy destroy) (scope notified):
 258  * @user_data:
 259  * @destroy:
 260  *
 261  *
 262  *
 263  * Since: 1.0
 264  **/
 265 void
 266 hb_font_funcs_set_glyph_extents_func (hb_font_funcs_t *ffuncs,
 267                                       hb_font_get_glyph_extents_func_t func,
 268                                       void *user_data, hb_destroy_func_t destroy);
 269
 270 /**
 271  * hb_font_funcs_set_glyph_contour_point_func:
 272  * @ffuncs: font functions.
 273  * @func: (closure user_data) (destroy destroy) (scope notified):
 274  * @user_data:
 275  * @destroy:
 276  *
 277  *
 278  *
 279  * Since: 1.0
 280  **/
 281 void
 282 hb_font_funcs_set_glyph_contour_point_func (hb_font_funcs_t *ffuncs,
 283                                             hb_font_get_glyph_contour_point_func_t func,
 284                                             void *user_data, hb_destroy_func_t destroy);
 285
 286 /**
 287  * hb_font_funcs_set_glyph_name_func:
 288  * @ffuncs: font functions.
 289  * @func: (closure user_data) (destroy destroy) (scope notified):
 290  * @user_data:
 291  * @destroy:
 292  *
 293  *
 294  *
 295  * Since: 1.0
 296  **/
 297 void
 298 hb_font_funcs_set_glyph_name_func (hb_font_funcs_t *ffuncs,
 299                                    hb_font_get_glyph_name_func_t func,
 300                                    void *user_data, hb_destroy_func_t destroy);
 301
 302 /**
 303  * hb_font_funcs_set_glyph_from_name_func:
 304  * @ffuncs: font functions.
 305  * @func: (closure user_data) (destroy destroy) (scope notified):
 306  * @user_data:
 307  * @destroy:
 308  *
 309  *
 310  *
 311  * Since: 1.0
 312  **/
 313 void
 314 hb_font_funcs_set_glyph_from_name_func (hb_font_funcs_t *ffuncs,
 315                                         hb_font_get_glyph_from_name_func_t func,
 316                                         void *user_data, hb_destroy_func_t destroy);
 317
 318
 319 /* func dispatch */
 320
 321 hb_bool_t
 322 hb_font_get_glyph (hb_font_t *font,
 323                    hb_codepoint_t unicode, hb_codepoint_t variation_selector,
 324                    hb_codepoint_t *glyph);
 325
 326 hb_position_t
 327 hb_font_get_glyph_h_advance (hb_font_t *font,
 328                              hb_codepoint_t glyph);
 329 hb_position_t
 330 hb_font_get_glyph_v_advance (hb_font_t *font,
 331                              hb_codepoint_t glyph);
 332
 333 hb_bool_t
 334 hb_font_get_glyph_h_origin (hb_font_t *font,
 335                             hb_codepoint_t glyph,
 336                             hb_position_t *x, hb_position_t *y);
 337 hb_bool_t
 338 hb_font_get_glyph_v_origin (hb_font_t *font,
 339                             hb_codepoint_t glyph,
 340                             hb_position_t *x, hb_position_t *y);
 341
 342 hb_position_t
 343 hb_font_get_glyph_h_kerning (hb_font_t *font,
 344                              hb_codepoint_t left_glyph, hb_codepoint_t right_glyph);
 345 hb_position_t
 346 hb_font_get_glyph_v_kerning (hb_font_t *font,
 347                              hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph);
 348
 349 hb_bool_t
 350 hb_font_get_glyph_extents (hb_font_t *font,
 351                            hb_codepoint_t glyph,
 352                            hb_glyph_extents_t *extents);
 353
 354 hb_bool_t
 355 hb_font_get_glyph_contour_point (hb_font_t *font,
 356                                  hb_codepoint_t glyph, unsigned int point_index,
 357                                  hb_position_t *x, hb_position_t *y);
 358
 359 hb_bool_t
 360 hb_font_get_glyph_name (hb_font_t *font,
 361                         hb_codepoint_t glyph,
 362                         char *name, unsigned int size);
 363 hb_bool_t
 364 hb_font_get_glyph_from_name (hb_font_t *font,
 365                              const char *name, int len, /* -1 means nul-terminated */
 366                              hb_codepoint_t *glyph);
 367
 368
 369 /* high-level funcs, with fallback */
 370
 371 void
 372 hb_font_get_glyph_advance_for_direction (hb_font_t *font,
 373                                          hb_codepoint_t glyph,
 374                                          hb_direction_t direction,
 375                                          hb_position_t *x, hb_position_t *y);
 376 void
 377 hb_font_get_glyph_origin_for_direction (hb_font_t *font,
 378                                         hb_codepoint_t glyph,
 379                                         hb_direction_t direction,
 380                                         hb_position_t *x, hb_position_t *y);
 381 void
 382 hb_font_add_glyph_origin_for_direction (hb_font_t *font,
 383                                         hb_codepoint_t glyph,
 384                                         hb_direction_t direction,
 385                                         hb_position_t *x, hb_position_t *y);
 386 void
 387 hb_font_subtract_glyph_origin_for_direction (hb_font_t *font,
 388                                              hb_codepoint_t glyph,
 389                                              hb_direction_t direction,
 390                                              hb_position_t *x, hb_position_t *y);
 391
 392 void
 393 hb_font_get_glyph_kerning_for_direction (hb_font_t *font,
 394                                          hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
 395                                          hb_direction_t direction,
 396                                          hb_position_t *x, hb_position_t *y);
 397
 398 hb_bool_t
 399 hb_font_get_glyph_extents_for_origin (hb_font_t *font,
 400                                       hb_codepoint_t glyph,
 401                                       hb_direction_t direction,
 402                                       hb_glyph_extents_t *extents);
 403
 404 hb_bool_t
 405 hb_font_get_glyph_contour_point_for_origin (hb_font_t *font,
 406                                             hb_codepoint_t glyph, unsigned int point_index,
 407                                             hb_direction_t direction,
 408                                             hb_position_t *x, hb_position_t *y);
 409
 410 /* Generates gidDDD if glyph has no name. */
 411 void
 412 hb_font_glyph_to_string (hb_font_t *font,
 413                          hb_codepoint_t glyph,
 414                          char *s, unsigned int size);
 415 /* Parses gidDDD and uniUUUU strings automatically. */
 416 hb_bool_t
 417 hb_font_glyph_from_string (hb_font_t *font,
 418                            const char *s, int len, /* -1 means nul-terminated */
 419                            hb_codepoint_t *glyph);
 420
 421
 422 /*
 423  * hb_font_t
 424  */
 425
 426 /* Fonts are very light-weight objects */
 427
 428 hb_font_t *
 429 hb_font_create (hb_face_t *face);
 430
 431 hb_font_t *
 432 hb_font_create_sub_font (hb_font_t *parent);
 433
 434 hb_font_t *
 435 hb_font_get_empty (void);
 436
 437 hb_font_t *
 438 hb_font_reference (hb_font_t *font);
 439
 440 void
 441 hb_font_destroy (hb_font_t *font);
 442
 443 hb_bool_t
 444 hb_font_set_user_data (hb_font_t          *font,
 445                        hb_user_data_key_t *key,
 446                        void *              data,
 447                        hb_destroy_func_t   destroy,
 448                        hb_bool_t           replace);
 449
 450
 451 void *
 452 hb_font_get_user_data (hb_font_t          *font,
 453                        hb_user_data_key_t *key);
 454
 455 void
 456 hb_font_make_immutable (hb_font_t *font);
 457
 458 hb_bool_t
 459 hb_font_is_immutable (hb_font_t *font);
 460
 461 hb_font_t *
 462 hb_font_get_parent (hb_font_t *font);
 463
 464 hb_face_t *
 465 hb_font_get_face (hb_font_t *font);
 466
 467
 468 void
 469 hb_font_set_funcs (hb_font_t         *font,
 470                    hb_font_funcs_t   *klass,
 471                    void              *font_data,
 472                    hb_destroy_func_t  destroy);
 473
 474 /* Be *very* careful with this function! */
 475 void
 476 hb_font_set_funcs_data (hb_font_t         *font,
 477                         void              *font_data,
 478                         hb_destroy_func_t  destroy);
 479
 480
 481 void
 482 hb_font_set_scale (hb_font_t *font,
 483                    int x_scale,
 484                    int y_scale);
 485
 486 void
 487 hb_font_get_scale (hb_font_t *font,
 488                    int *x_scale,
 489                    int *y_scale);
 490
 491 /*
 492  * A zero value means "no hinting in that direction"
 493  */
 494 void
 495 hb_font_set_ppem (hb_font_t *font,
 496                   unsigned int x_ppem,
 497                   unsigned int y_ppem);
 498
 499 void
 500 hb_font_get_ppem (hb_font_t *font,
 501                   unsigned int *x_ppem,
 502                   unsigned int *y_ppem);
 503
 504
 505 HB_END_DECLS
 506
 507 #endif /* HB_FONT_H */