1 /* 2 * Copyright © 2011,2012 Google, 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 * Google Author(s): Behdad Esfahbod 25 */ 26 27 #include "hb-ot-shape-fallback.hh" 28 #include "hb-kern.hh" 29 30 static unsigned int 31 recategorize_combining_class (hb_codepoint_t u, 32 unsigned int klass) 33 { 34 if (klass >= 200) 35 return klass; 36 37 /* Thai / Lao need some per-character work. */ 38 if ((u & ~0xFF) == 0x0E00u) 39 { 40 if (unlikely (klass == 0)) 41 { 42 switch (u) 43 { 44 case 0x0E31u: 45 case 0x0E34u: 46 case 0x0E35u: 47 case 0x0E36u: 48 case 0x0E37u: 49 case 0x0E47u: 50 case 0x0E4Cu: 51 case 0x0E4Du: 52 case 0x0E4Eu: 53 klass = HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT; 54 break; 55 56 case 0x0EB1u: 57 case 0x0EB4u: 58 case 0x0EB5u: 59 case 0x0EB6u: 60 case 0x0EB7u: 61 case 0x0EBBu: 62 case 0x0ECCu: 63 case 0x0ECDu: 64 klass = HB_UNICODE_COMBINING_CLASS_ABOVE; 65 break; 66 67 case 0x0EBCu: 68 klass = HB_UNICODE_COMBINING_CLASS_BELOW; 69 break; 70 } 71 } else { 72 /* Thai virama is below-right */ 73 if (u == 0x0E3Au) 74 klass = HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT; 75 } 76 } 77 78 switch (klass) 79 { 80 81 /* Hebrew */ 82 83 case HB_MODIFIED_COMBINING_CLASS_CCC10: /* sheva */ 84 case HB_MODIFIED_COMBINING_CLASS_CCC11: /* hataf segol */ 85 case HB_MODIFIED_COMBINING_CLASS_CCC12: /* hataf patah */ 86 case HB_MODIFIED_COMBINING_CLASS_CCC13: /* hataf qamats */ 87 case HB_MODIFIED_COMBINING_CLASS_CCC14: /* hiriq */ 88 case HB_MODIFIED_COMBINING_CLASS_CCC15: /* tsere */ 89 case HB_MODIFIED_COMBINING_CLASS_CCC16: /* segol */ 90 case HB_MODIFIED_COMBINING_CLASS_CCC17: /* patah */ 91 case HB_MODIFIED_COMBINING_CLASS_CCC18: /* qamats */ 92 case HB_MODIFIED_COMBINING_CLASS_CCC20: /* qubuts */ 93 case HB_MODIFIED_COMBINING_CLASS_CCC22: /* meteg */ 94 return HB_UNICODE_COMBINING_CLASS_BELOW; 95 96 case HB_MODIFIED_COMBINING_CLASS_CCC23: /* rafe */ 97 return HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE; 98 99 case HB_MODIFIED_COMBINING_CLASS_CCC24: /* shin dot */ 100 return HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT; 101 102 case HB_MODIFIED_COMBINING_CLASS_CCC25: /* sin dot */ 103 case HB_MODIFIED_COMBINING_CLASS_CCC19: /* holam */ 104 return HB_UNICODE_COMBINING_CLASS_ABOVE_LEFT; 105 106 case HB_MODIFIED_COMBINING_CLASS_CCC26: /* point varika */ 107 return HB_UNICODE_COMBINING_CLASS_ABOVE; 108 109 case HB_MODIFIED_COMBINING_CLASS_CCC21: /* dagesh */ 110 break; 111 112 113 /* Arabic and Syriac */ 114 115 case HB_MODIFIED_COMBINING_CLASS_CCC27: /* fathatan */ 116 case HB_MODIFIED_COMBINING_CLASS_CCC28: /* dammatan */ 117 case HB_MODIFIED_COMBINING_CLASS_CCC30: /* fatha */ 118 case HB_MODIFIED_COMBINING_CLASS_CCC31: /* damma */ 119 case HB_MODIFIED_COMBINING_CLASS_CCC33: /* shadda */ 120 case HB_MODIFIED_COMBINING_CLASS_CCC34: /* sukun */ 121 case HB_MODIFIED_COMBINING_CLASS_CCC35: /* superscript alef */ 122 case HB_MODIFIED_COMBINING_CLASS_CCC36: /* superscript alaph */ 123 return HB_UNICODE_COMBINING_CLASS_ABOVE; 124 125 case HB_MODIFIED_COMBINING_CLASS_CCC29: /* kasratan */ 126 case HB_MODIFIED_COMBINING_CLASS_CCC32: /* kasra */ 127 return HB_UNICODE_COMBINING_CLASS_BELOW; 128 129 130 /* Thai */ 131 132 case HB_MODIFIED_COMBINING_CLASS_CCC103: /* sara u / sara uu */ 133 return HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT; 134 135 case HB_MODIFIED_COMBINING_CLASS_CCC107: /* mai */ 136 return HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT; 137 138 139 /* Lao */ 140 141 case HB_MODIFIED_COMBINING_CLASS_CCC118: /* sign u / sign uu */ 142 return HB_UNICODE_COMBINING_CLASS_BELOW; 143 144 case HB_MODIFIED_COMBINING_CLASS_CCC122: /* mai */ 145 return HB_UNICODE_COMBINING_CLASS_ABOVE; 146 147 148 /* Tibetan */ 149 150 case HB_MODIFIED_COMBINING_CLASS_CCC129: /* sign aa */ 151 return HB_UNICODE_COMBINING_CLASS_BELOW; 152 153 case HB_MODIFIED_COMBINING_CLASS_CCC130: /* sign i*/ 154 return HB_UNICODE_COMBINING_CLASS_ABOVE; 155 156 case HB_MODIFIED_COMBINING_CLASS_CCC132: /* sign u */ 157 return HB_UNICODE_COMBINING_CLASS_BELOW; 158 159 } 160 161 return klass; 162 } 163 164 void 165 _hb_ot_shape_fallback_mark_position_recategorize_marks (const hb_ot_shape_plan_t *plan HB_UNUSED, 166 hb_font_t *font HB_UNUSED, 167 hb_buffer_t *buffer) 168 { 169 unsigned int count = buffer->len; 170 hb_glyph_info_t *info = buffer->info; 171 for (unsigned int i = 0; i < count; i++) 172 if (_hb_glyph_info_get_general_category (&info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) { 173 unsigned int combining_class = _hb_glyph_info_get_modified_combining_class (&info[i]); 174 combining_class = recategorize_combining_class (info[i].codepoint, combining_class); 175 _hb_glyph_info_set_modified_combining_class (&info[i], combining_class); 176 } 177 } 178 179 180 static void 181 zero_mark_advances (hb_buffer_t *buffer, 182 unsigned int start, 183 unsigned int end, 184 bool adjust_offsets_when_zeroing) 185 { 186 hb_glyph_info_t *info = buffer->info; 187 for (unsigned int i = start; i < end; i++) 188 if (_hb_glyph_info_get_general_category (&info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) 189 { 190 if (adjust_offsets_when_zeroing) 191 { 192 buffer->pos[i].x_offset -= buffer->pos[i].x_advance; 193 buffer->pos[i].y_offset -= buffer->pos[i].y_advance; 194 } 195 buffer->pos[i].x_advance = 0; 196 buffer->pos[i].y_advance = 0; 197 } 198 } 199 200 static inline void 201 position_mark (const hb_ot_shape_plan_t *plan HB_UNUSED, 202 hb_font_t *font, 203 hb_buffer_t *buffer, 204 hb_glyph_extents_t &base_extents, 205 unsigned int i, 206 unsigned int combining_class) 207 { 208 hb_glyph_extents_t mark_extents; 209 if (!font->get_glyph_extents (buffer->info[i].codepoint, &mark_extents)) 210 return; 211 212 hb_position_t y_gap = font->y_scale / 16; 213 214 hb_glyph_position_t &pos = buffer->pos[i]; 215 pos.x_offset = pos.y_offset = 0; 216 217 218 /* We don't position LEFT and RIGHT marks. */ 219 220 /* X positioning */ 221 switch (combining_class) 222 { 223 case HB_UNICODE_COMBINING_CLASS_DOUBLE_BELOW: 224 case HB_UNICODE_COMBINING_CLASS_DOUBLE_ABOVE: 225 if (buffer->props.direction == HB_DIRECTION_LTR) { 226 pos.x_offset += base_extents.x_bearing + base_extents.width - mark_extents.width / 2 - mark_extents.x_bearing; 227 break; 228 } else if (buffer->props.direction == HB_DIRECTION_RTL) { 229 pos.x_offset += base_extents.x_bearing - mark_extents.width / 2 - mark_extents.x_bearing; 230 break; 231 } 232 HB_FALLTHROUGH; 233 234 default: 235 case HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW: 236 case HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE: 237 case HB_UNICODE_COMBINING_CLASS_BELOW: 238 case HB_UNICODE_COMBINING_CLASS_ABOVE: 239 /* Center align. */ 240 pos.x_offset += base_extents.x_bearing + (base_extents.width - mark_extents.width) / 2 - mark_extents.x_bearing; 241 break; 242 243 case HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW_LEFT: 244 case HB_UNICODE_COMBINING_CLASS_BELOW_LEFT: 245 case HB_UNICODE_COMBINING_CLASS_ABOVE_LEFT: 246 /* Left align. */ 247 pos.x_offset += base_extents.x_bearing - mark_extents.x_bearing; 248 break; 249 250 case HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE_RIGHT: 251 case HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT: 252 case HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT: 253 /* Right align. */ 254 pos.x_offset += base_extents.x_bearing + base_extents.width - mark_extents.width - mark_extents.x_bearing; 255 break; 256 } 257 258 /* Y positioning */ 259 switch (combining_class) 260 { 261 case HB_UNICODE_COMBINING_CLASS_DOUBLE_BELOW: 262 case HB_UNICODE_COMBINING_CLASS_BELOW_LEFT: 263 case HB_UNICODE_COMBINING_CLASS_BELOW: 264 case HB_UNICODE_COMBINING_CLASS_BELOW_RIGHT: 265 /* Add gap, fall-through. */ 266 base_extents.height -= y_gap; 267 HB_FALLTHROUGH; 268 269 case HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW_LEFT: 270 case HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW: 271 pos.y_offset = base_extents.y_bearing + base_extents.height - mark_extents.y_bearing; 272 /* Never shift up "below" marks. */ 273 if ((y_gap > 0) == (pos.y_offset > 0)) 274 { 275 base_extents.height -= pos.y_offset; 276 pos.y_offset = 0; 277 } 278 base_extents.height += mark_extents.height; 279 break; 280 281 case HB_UNICODE_COMBINING_CLASS_DOUBLE_ABOVE: 282 case HB_UNICODE_COMBINING_CLASS_ABOVE_LEFT: 283 case HB_UNICODE_COMBINING_CLASS_ABOVE: 284 case HB_UNICODE_COMBINING_CLASS_ABOVE_RIGHT: 285 /* Add gap, fall-through. */ 286 base_extents.y_bearing += y_gap; 287 base_extents.height -= y_gap; 288 HB_FALLTHROUGH; 289 290 case HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE: 291 case HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE_RIGHT: 292 pos.y_offset = base_extents.y_bearing - (mark_extents.y_bearing + mark_extents.height); 293 /* Don't shift down "above" marks too much. */ 294 if ((y_gap > 0) != (pos.y_offset > 0)) 295 { 296 unsigned int correction = -pos.y_offset / 2; 297 base_extents.y_bearing += correction; 298 base_extents.height -= correction; 299 pos.y_offset += correction; 300 } 301 base_extents.y_bearing -= mark_extents.height; 302 base_extents.height += mark_extents.height; 303 break; 304 } 305 } 306 307 static inline void 308 position_around_base (const hb_ot_shape_plan_t *plan, 309 hb_font_t *font, 310 hb_buffer_t *buffer, 311 unsigned int base, 312 unsigned int end, 313 bool adjust_offsets_when_zeroing) 314 { 315 hb_direction_t horiz_dir = HB_DIRECTION_INVALID; 316 317 buffer->unsafe_to_break (base, end); 318 319 hb_glyph_extents_t base_extents; 320 if (!font->get_glyph_extents (buffer->info[base].codepoint, 321 &base_extents)) 322 { 323 /* If extents don't work, zero marks and go home. */ 324 zero_mark_advances (buffer, base + 1, end, adjust_offsets_when_zeroing); 325 return; 326 } 327 base_extents.y_bearing += buffer->pos[base].y_offset; 328 /* Use horizontal advance for horizontal positioning. 329 * Generally a better idea. Also works for zero-ink glyphs. See: 330 * https://github.com/harfbuzz/harfbuzz/issues/1532 */ 331 base_extents.x_bearing = 0; 332 base_extents.width = font->get_glyph_h_advance (buffer->info[base].codepoint); 333 334 unsigned int lig_id = _hb_glyph_info_get_lig_id (&buffer->info[base]); 335 /* Use integer for num_lig_components such that it doesn't convert to unsigned 336 * when we divide or multiply by it. */ 337 int num_lig_components = _hb_glyph_info_get_lig_num_comps (&buffer->info[base]); 338 339 hb_position_t x_offset = 0, y_offset = 0; 340 if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) { 341 x_offset -= buffer->pos[base].x_advance; 342 y_offset -= buffer->pos[base].y_advance; 343 } 344 345 hb_glyph_extents_t component_extents = base_extents; 346 int last_lig_component = -1; 347 unsigned int last_combining_class = 255; 348 hb_glyph_extents_t cluster_extents = base_extents; /* Initialization is just to shut gcc up. */ 349 hb_glyph_info_t *info = buffer->info; 350 for (unsigned int i = base + 1; i < end; i++) 351 if (_hb_glyph_info_get_modified_combining_class (&info[i])) 352 { 353 if (num_lig_components > 1) { 354 unsigned int this_lig_id = _hb_glyph_info_get_lig_id (&info[i]); 355 int this_lig_component = _hb_glyph_info_get_lig_comp (&info[i]) - 1; 356 /* Conditions for attaching to the last component. */ 357 if (!lig_id || lig_id != this_lig_id || this_lig_component >= num_lig_components) 358 this_lig_component = num_lig_components - 1; 359 if (last_lig_component != this_lig_component) 360 { 361 last_lig_component = this_lig_component; 362 last_combining_class = 255; 363 component_extents = base_extents; 364 if (unlikely (horiz_dir == HB_DIRECTION_INVALID)) { 365 if (HB_DIRECTION_IS_HORIZONTAL (plan->props.direction)) 366 horiz_dir = plan->props.direction; 367 else 368 horiz_dir = hb_script_get_horizontal_direction (plan->props.script); 369 } 370 if (horiz_dir == HB_DIRECTION_LTR) 371 component_extents.x_bearing += (this_lig_component * component_extents.width) / num_lig_components; 372 else 373 component_extents.x_bearing += ((num_lig_components - 1 - this_lig_component) * component_extents.width) / num_lig_components; 374 component_extents.width /= num_lig_components; 375 } 376 } 377 378 unsigned int this_combining_class = _hb_glyph_info_get_modified_combining_class (&info[i]); 379 if (last_combining_class != this_combining_class) 380 { 381 last_combining_class = this_combining_class; 382 cluster_extents = component_extents; 383 } 384 385 position_mark (plan, font, buffer, cluster_extents, i, this_combining_class); 386 387 buffer->pos[i].x_advance = 0; 388 buffer->pos[i].y_advance = 0; 389 buffer->pos[i].x_offset += x_offset; 390 buffer->pos[i].y_offset += y_offset; 391 392 } else { 393 if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) { 394 x_offset -= buffer->pos[i].x_advance; 395 y_offset -= buffer->pos[i].y_advance; 396 } else { 397 x_offset += buffer->pos[i].x_advance; 398 y_offset += buffer->pos[i].y_advance; 399 } 400 } 401 } 402 403 static inline void 404 position_cluster (const hb_ot_shape_plan_t *plan, 405 hb_font_t *font, 406 hb_buffer_t *buffer, 407 unsigned int start, 408 unsigned int end, 409 bool adjust_offsets_when_zeroing) 410 { 411 if (end - start < 2) 412 return; 413 414 /* Find the base glyph */ 415 hb_glyph_info_t *info = buffer->info; 416 for (unsigned int i = start; i < end; i++) 417 if (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[i]))) 418 { 419 /* Find mark glyphs */ 420 unsigned int j; 421 for (j = i + 1; j < end; j++) 422 if (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[j]))) 423 break; 424 425 position_around_base (plan, font, buffer, i, j, adjust_offsets_when_zeroing); 426 427 i = j - 1; 428 } 429 } 430 431 void 432 _hb_ot_shape_fallback_mark_position (const hb_ot_shape_plan_t *plan, 433 hb_font_t *font, 434 hb_buffer_t *buffer, 435 bool adjust_offsets_when_zeroing) 436 { 437 _hb_buffer_assert_gsubgpos_vars (buffer); 438 439 unsigned int start = 0; 440 unsigned int count = buffer->len; 441 hb_glyph_info_t *info = buffer->info; 442 for (unsigned int i = 1; i < count; i++) 443 if (likely (!HB_UNICODE_GENERAL_CATEGORY_IS_MARK (_hb_glyph_info_get_general_category (&info[i])))) { 444 position_cluster (plan, font, buffer, start, i, adjust_offsets_when_zeroing); 445 start = i; 446 } 447 position_cluster (plan, font, buffer, start, count, adjust_offsets_when_zeroing); 448 } 449 450 451 struct hb_ot_shape_fallback_kern_driver_t 452 { 453 hb_ot_shape_fallback_kern_driver_t (hb_font_t *font_, 454 hb_buffer_t *buffer) : 455 font (font_), direction (buffer->props.direction) {} 456 457 hb_position_t get_kerning (hb_codepoint_t first, hb_codepoint_t second) const 458 { 459 hb_position_t kern = 0; 460 font->get_glyph_kerning_for_direction (first, second, 461 direction, 462 &kern, &kern); 463 return kern; 464 } 465 466 hb_font_t *font; 467 hb_direction_t direction; 468 }; 469 470 /* Performs font-assisted kerning. */ 471 void 472 _hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan, 473 hb_font_t *font, 474 hb_buffer_t *buffer) 475 { 476 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction) ? 477 !font->has_glyph_h_kerning_func () : 478 !font->has_glyph_v_kerning_func ()) 479 return; 480 481 bool reverse = HB_DIRECTION_IS_BACKWARD (buffer->props.direction); 482 483 if (reverse) 484 buffer->reverse (); 485 486 hb_ot_shape_fallback_kern_driver_t driver (font, buffer); 487 OT::hb_kern_machine_t<hb_ot_shape_fallback_kern_driver_t> machine (driver); 488 machine.kern (font, buffer, plan->kern_mask, false); 489 490 if (reverse) 491 buffer->reverse (); 492 } 493 494 495 /* Adjusts width of various spaces. */ 496 void 497 _hb_ot_shape_fallback_spaces (const hb_ot_shape_plan_t *plan HB_UNUSED, 498 hb_font_t *font, 499 hb_buffer_t *buffer) 500 { 501 hb_glyph_info_t *info = buffer->info; 502 hb_glyph_position_t *pos = buffer->pos; 503 bool horizontal = HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction); 504 unsigned int count = buffer->len; 505 for (unsigned int i = 0; i < count; i++) 506 if (_hb_glyph_info_is_unicode_space (&info[i]) && !_hb_glyph_info_ligated (&info[i])) 507 { 508 hb_unicode_funcs_t::space_t space_type = _hb_glyph_info_get_unicode_space_fallback_type (&info[i]); 509 hb_codepoint_t glyph; 510 typedef hb_unicode_funcs_t t; 511 switch (space_type) 512 { 513 case t::NOT_SPACE: /* Shouldn't happen. */ 514 case t::SPACE: 515 break; 516 517 case t::SPACE_EM: 518 case t::SPACE_EM_2: 519 case t::SPACE_EM_3: 520 case t::SPACE_EM_4: 521 case t::SPACE_EM_5: 522 case t::SPACE_EM_6: 523 case t::SPACE_EM_16: 524 if (horizontal) 525 pos[i].x_advance = +(font->x_scale + ((int) space_type)/2) / (int) space_type; 526 else 527 pos[i].y_advance = -(font->y_scale + ((int) space_type)/2) / (int) space_type; 528 break; 529 530 case t::SPACE_4_EM_18: 531 if (horizontal) 532 pos[i].x_advance = (int64_t) +font->x_scale * 4 / 18; 533 else 534 pos[i].y_advance = (int64_t) -font->y_scale * 4 / 18; 535 break; 536 537 case t::SPACE_FIGURE: 538 for (char u = '0'; u <= '9'; u++) 539 if (font->get_nominal_glyph (u, &glyph)) 540 { 541 if (horizontal) 542 pos[i].x_advance = font->get_glyph_h_advance (glyph); 543 else 544 pos[i].y_advance = font->get_glyph_v_advance (glyph); 545 break; 546 } 547 break; 548 549 case t::SPACE_PUNCTUATION: 550 if (font->get_nominal_glyph ('.', &glyph) || 551 font->get_nominal_glyph (',', &glyph)) 552 { 553 if (horizontal) 554 pos[i].x_advance = font->get_glyph_h_advance (glyph); 555 else 556 pos[i].y_advance = font->get_glyph_v_advance (glyph); 557 } 558 break; 559 560 case t::SPACE_NARROW: 561 /* Half-space? 562 * Unicode doc https://unicode.org/charts/PDF/U2000.pdf says ~1/4 or 1/5 of EM. 563 * However, in my testing, many fonts have their regular space being about that 564 * size. To me, a percentage of the space width makes more sense. Half is as 565 * good as any. */ 566 if (horizontal) 567 pos[i].x_advance /= 2; 568 else 569 pos[i].y_advance /= 2; 570 break; 571 } 572 } 573 }