gfx/harfbuzz/src/hb-ot-layout.hh

   1 /*
   2  * Copyright © 2007,2008,2009  Red Hat, Inc.
   3  * Copyright © 2012,2013  Google, Inc.
   4  *
   5  *  This is part of HarfBuzz, a text shaping library.
   6  *
   7  * Permission is hereby granted, without written agreement and without
   8  * license or royalty fees, to use, copy, modify, and distribute this
   9  * software and its documentation for any purpose, provided that the
  10  * above copyright notice and the following two paragraphs appear in
  11  * all copies of this software.
  12  *
  13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  17  * DAMAGE.
  18  *
  19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  24  *
  25  * Red Hat Author(s): Behdad Esfahbod
  26  * Google Author(s): Behdad Esfahbod
  27  */
  28
  29 #ifndef HB_OT_LAYOUT_HH
  30 #define HB_OT_LAYOUT_HH
  31
  32 #include "hb.hh"
  33
  34 #include "hb-font.hh"
  35 #include "hb-buffer.hh"
  36 #include "hb-open-type.hh"
  37 #include "hb-ot-shape.hh"
  38 #include "hb-set-digest.hh"
  39
  40
  41 struct hb_ot_shape_plan_t;
  42
  43
  44 /*
  45  * kern
  46  */
  47
  48 HB_INTERNAL bool
  49 hb_ot_layout_has_kerning (hb_face_t *face);
  50
  51 HB_INTERNAL bool
  52 hb_ot_layout_has_machine_kerning (hb_face_t *face);
  53
  54 HB_INTERNAL bool
  55 hb_ot_layout_has_cross_kerning (hb_face_t *face);
  56
  57 HB_INTERNAL void
  58 hb_ot_layout_kern (const hb_ot_shape_plan_t *plan,
  59                    hb_font_t *font,
  60                    hb_buffer_t  *buffer);
  61
  62
  63 /* Private API corresponding to hb-ot-layout.h: */
  64
  65 HB_INTERNAL bool
  66 hb_ot_layout_table_find_feature (hb_face_t    *face,
  67                                  hb_tag_t      table_tag,
  68                                  hb_tag_t      feature_tag,
  69                                  unsigned int *feature_index);
  70
  71
  72 /*
  73  * GDEF
  74  */
  75
  76 enum hb_ot_layout_glyph_props_flags_t
  77 {
  78   /* The following three match LookupFlags::Ignore* numbers. */
  79   HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH   = 0x02u,
  80   HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE     = 0x04u,
  81   HB_OT_LAYOUT_GLYPH_PROPS_MARK         = 0x08u,
  82
  83   /* The following are used internally; not derived from GDEF. */
  84   HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED  = 0x10u,
  85   HB_OT_LAYOUT_GLYPH_PROPS_LIGATED      = 0x20u,
  86   HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED   = 0x40u,
  87
  88   HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE     = HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED |
  89                                           HB_OT_LAYOUT_GLYPH_PROPS_LIGATED |
  90                                           HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED
  91 };
  92 HB_MARK_AS_FLAG_T (hb_ot_layout_glyph_props_flags_t);
  93
  94
  95 /*
  96  * GSUB/GPOS
  97  */
  98
  99
 100 /* Should be called before all the substitute_lookup's are done. */
 101 HB_INTERNAL void
 102 hb_ot_layout_substitute_start (hb_font_t    *font,
 103                                hb_buffer_t  *buffer);
 104
 105 namespace OT {
 106   struct hb_ot_apply_context_t;
 107   struct hb_ot_layout_lookup_accelerator_t;
 108 namespace Layout {
 109 namespace GSUB_impl {
 110   struct SubstLookup;
 111 }
 112 }
 113 }
 114
 115 HB_INTERNAL void
 116 hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c,
 117                                 const OT::Layout::GSUB_impl::SubstLookup &lookup,
 118                                 const OT::hb_ot_layout_lookup_accelerator_t &accel);
 119
 120
 121 /* Should be called before all the position_lookup's are done. */
 122 HB_INTERNAL void
 123 hb_ot_layout_position_start (hb_font_t    *font,
 124                              hb_buffer_t  *buffer);
 125
 126 /* Should be called after all the position_lookup's are done, to fini advances. */
 127 HB_INTERNAL void
 128 hb_ot_layout_position_finish_advances (hb_font_t    *font,
 129                                        hb_buffer_t  *buffer);
 130
 131 /* Should be called after hb_ot_layout_position_finish_advances, to fini offsets. */
 132 HB_INTERNAL void
 133 hb_ot_layout_position_finish_offsets (hb_font_t    *font,
 134                                       hb_buffer_t  *buffer);
 135
 136
 137 /*
 138  * Buffer var routines.
 139  */
 140
 141 /* buffer var allocations, used during the entire shaping process */
 142 #define unicode_props()         var2.u16[0]
 143
 144 /* buffer var allocations, used during the GSUB/GPOS processing */
 145 #define glyph_props()           var1.u16[0] /* GDEF glyph properties */
 146 #define lig_props()             var1.u8[2] /* GSUB/GPOS ligature tracking */
 147 #define syllable()              var1.u8[3] /* GSUB/GPOS shaping boundaries */
 148
 149
 150 /* Loop over syllables. Based on foreach_cluster(). */
 151 #define foreach_syllable(buffer, start, end) \
 152   for (unsigned int \
 153        _count = buffer->len, \
 154        start = 0, end = _count ? _hb_next_syllable (buffer, 0) : 0; \
 155        start < _count; \
 156        start = end, end = _hb_next_syllable (buffer, start))
 157
 158 static inline unsigned int
 159 _hb_next_syllable (hb_buffer_t *buffer, unsigned int start)
 160 {
 161   hb_glyph_info_t *info = buffer->info;
 162   unsigned int count = buffer->len;
 163
 164   unsigned int syllable = info[start].syllable();
 165   while (++start < count && syllable == info[start].syllable())
 166     ;
 167
 168   return start;
 169 }
 170
 171
 172 /* unicode_props */
 173
 174 /* Design:
 175  * unicode_props() is a two-byte number.  The low byte includes:
 176  * - General_Category: 5 bits.
 177  * - A bit each for:
 178  *   * Is it Default_Ignorable(); we have a modified Default_Ignorable().
 179  *   * Whether it's one of the four Mongolian Free Variation Selectors,
 180  *     CGJ, or other characters that are hidden but should not be ignored
 181  *     like most other Default_Ignorable()s do during matching.
 182  *   * Whether it's a grapheme continuation.
 183  *
 184  * The high-byte has different meanings, switched by the Gen-Cat:
 185  * - For Mn,Mc,Me: the modified Combining_Class.
 186  * - For Cf: whether it's ZWJ, ZWNJ, or something else.
 187  * - For Ws: index of which space character this is, if space fallback
 188  *   is needed, ie. we don't set this by default, only if asked to.
 189  */
 190
 191 enum hb_unicode_props_flags_t {
 192   UPROPS_MASK_GEN_CAT   = 0x001Fu,
 193   UPROPS_MASK_IGNORABLE = 0x0020u,
 194   UPROPS_MASK_HIDDEN    = 0x0040u, /* MONGOLIAN FREE VARIATION SELECTOR 1..4, or TAG characters */
 195   UPROPS_MASK_CONTINUATION=0x0080u,
 196
 197   /* If GEN_CAT=FORMAT, top byte masks: */
 198   UPROPS_MASK_Cf_ZWJ    = 0x0100u,
 199   UPROPS_MASK_Cf_ZWNJ   = 0x0200u
 200 };
 201 HB_MARK_AS_FLAG_T (hb_unicode_props_flags_t);
 202
 203 static inline void
 204 _hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_buffer_t *buffer)
 205 {
 206   hb_unicode_funcs_t *unicode = buffer->unicode;
 207   unsigned int u = info->codepoint;
 208   unsigned int gen_cat = (unsigned int) unicode->general_category (u);
 209   unsigned int props = gen_cat;
 210
 211   if (u >= 0x80u)
 212   {
 213     buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII;
 214
 215     if (unlikely (unicode->is_default_ignorable (u)))
 216     {
 217       buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES;
 218       props |=  UPROPS_MASK_IGNORABLE;
 219       if (u == 0x200Cu) props |= UPROPS_MASK_Cf_ZWNJ;
 220       else if (u == 0x200Du) props |= UPROPS_MASK_Cf_ZWJ;
 221       /* Mongolian Free Variation Selectors need to be remembered
 222        * because although we need to hide them like default-ignorables,
 223        * they need to non-ignorable during shaping.  This is similar to
 224        * what we do for joiners in Indic-like shapers, but since the
 225        * FVSes are GC=Mn, we have use a separate bit to remember them.
 226        * Fixes:
 227        * https://github.com/harfbuzz/harfbuzz/issues/234 */
 228       else if (unlikely (hb_in_ranges<hb_codepoint_t> (u, 0x180Bu, 0x180Du, 0x180Fu, 0x180Fu))) props |= UPROPS_MASK_HIDDEN;
 229       /* TAG characters need similar treatment. Fixes:
 230        * https://github.com/harfbuzz/harfbuzz/issues/463 */
 231       else if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xE0020u, 0xE007Fu))) props |= UPROPS_MASK_HIDDEN;
 232       /* COMBINING GRAPHEME JOINER should not be skipped; at least some times.
 233        * https://github.com/harfbuzz/harfbuzz/issues/554 */
 234       else if (unlikely (u == 0x034Fu))
 235       {
 236         buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_CGJ;
 237         props |= UPROPS_MASK_HIDDEN;
 238       }
 239     }
 240
 241     if (unlikely (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (gen_cat)))
 242     {
 243       props |= UPROPS_MASK_CONTINUATION;
 244       props |= unicode->modified_combining_class (u)<<8;
 245     }
 246   }
 247
 248   info->unicode_props() = props;
 249 }
 250
 251 static inline void
 252 _hb_glyph_info_set_general_category (hb_glyph_info_t *info,
 253                                      hb_unicode_general_category_t gen_cat)
 254 {
 255   /* Clears top-byte. */
 256   info->unicode_props() = (unsigned int) gen_cat | (info->unicode_props() & (0xFF & ~UPROPS_MASK_GEN_CAT));
 257 }
 258
 259 static inline hb_unicode_general_category_t
 260 _hb_glyph_info_get_general_category (const hb_glyph_info_t *info)
 261 {
 262   return (hb_unicode_general_category_t) (info->unicode_props() & UPROPS_MASK_GEN_CAT);
 263 }
 264
 265 static inline bool
 266 _hb_glyph_info_is_unicode_mark (const hb_glyph_info_t *info)
 267 {
 268   return HB_UNICODE_GENERAL_CATEGORY_IS_MARK (info->unicode_props() & UPROPS_MASK_GEN_CAT);
 269 }
 270 static inline void
 271 _hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info,
 272                                              unsigned int modified_class)
 273 {
 274   if (unlikely (!_hb_glyph_info_is_unicode_mark (info)))
 275     return;
 276   info->unicode_props() = (modified_class<<8) | (info->unicode_props() & 0xFF);
 277 }
 278 static inline unsigned int
 279 _hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info)
 280 {
 281   return _hb_glyph_info_is_unicode_mark (info) ? info->unicode_props()>>8 : 0;
 282 }
 283 #define info_cc(info) (_hb_glyph_info_get_modified_combining_class (&(info)))
 284
 285 static inline bool
 286 _hb_glyph_info_is_unicode_space (const hb_glyph_info_t *info)
 287 {
 288   return _hb_glyph_info_get_general_category (info) ==
 289          HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR;
 290 }
 291 static inline void
 292 _hb_glyph_info_set_unicode_space_fallback_type (hb_glyph_info_t *info, hb_unicode_funcs_t::space_t s)
 293 {
 294   if (unlikely (!_hb_glyph_info_is_unicode_space (info)))
 295     return;
 296   info->unicode_props() = (((unsigned int) s)<<8) | (info->unicode_props() & 0xFF);
 297 }
 298 static inline hb_unicode_funcs_t::space_t
 299 _hb_glyph_info_get_unicode_space_fallback_type (const hb_glyph_info_t *info)
 300 {
 301   return _hb_glyph_info_is_unicode_space (info) ?
 302          (hb_unicode_funcs_t::space_t) (info->unicode_props()>>8) :
 303          hb_unicode_funcs_t::NOT_SPACE;
 304 }
 305
 306 static inline bool _hb_glyph_info_substituted (const hb_glyph_info_t *info);
 307
 308 static inline bool
 309 _hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info)
 310 {
 311   return (info->unicode_props() & UPROPS_MASK_IGNORABLE) &&
 312          !_hb_glyph_info_substituted (info);
 313 }
 314 static inline bool
 315 _hb_glyph_info_is_default_ignorable_and_not_hidden (const hb_glyph_info_t *info)
 316 {
 317   return ((info->unicode_props() & (UPROPS_MASK_IGNORABLE|UPROPS_MASK_HIDDEN))
 318           == UPROPS_MASK_IGNORABLE) &&
 319          !_hb_glyph_info_substituted (info);
 320 }
 321 static inline void
 322 _hb_glyph_info_unhide (hb_glyph_info_t *info)
 323 {
 324   info->unicode_props() &= ~ UPROPS_MASK_HIDDEN;
 325 }
 326
 327 static inline void
 328 _hb_glyph_info_set_continuation (hb_glyph_info_t *info)
 329 {
 330   info->unicode_props() |= UPROPS_MASK_CONTINUATION;
 331 }
 332 static inline void
 333 _hb_glyph_info_reset_continuation (hb_glyph_info_t *info)
 334 {
 335   info->unicode_props() &= ~ UPROPS_MASK_CONTINUATION;
 336 }
 337 static inline bool
 338 _hb_glyph_info_is_continuation (const hb_glyph_info_t *info)
 339 {
 340   return info->unicode_props() & UPROPS_MASK_CONTINUATION;
 341 }
 342
 343 static inline bool
 344 _hb_grapheme_group_func (const hb_glyph_info_t& a HB_UNUSED,
 345                          const hb_glyph_info_t& b)
 346 { return _hb_glyph_info_is_continuation (&b); }
 347
 348 #define foreach_grapheme(buffer, start, end) \
 349         foreach_group (buffer, start, end, _hb_grapheme_group_func)
 350
 351 static inline void
 352 _hb_ot_layout_reverse_graphemes (hb_buffer_t *buffer)
 353 {
 354   buffer->reverse_groups (_hb_grapheme_group_func,
 355                           buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
 356 }
 357
 358 static inline bool
 359 _hb_glyph_info_is_unicode_format (const hb_glyph_info_t *info)
 360 {
 361   return _hb_glyph_info_get_general_category (info) ==
 362          HB_UNICODE_GENERAL_CATEGORY_FORMAT;
 363 }
 364 static inline bool
 365 _hb_glyph_info_is_zwnj (const hb_glyph_info_t *info)
 366 {
 367   return _hb_glyph_info_is_unicode_format (info) && (info->unicode_props() & UPROPS_MASK_Cf_ZWNJ);
 368 }
 369 static inline bool
 370 _hb_glyph_info_is_zwj (const hb_glyph_info_t *info)
 371 {
 372   return _hb_glyph_info_is_unicode_format (info) && (info->unicode_props() & UPROPS_MASK_Cf_ZWJ);
 373 }
 374 static inline bool
 375 _hb_glyph_info_is_joiner (const hb_glyph_info_t *info)
 376 {
 377   return _hb_glyph_info_is_unicode_format (info) && (info->unicode_props() & (UPROPS_MASK_Cf_ZWNJ|UPROPS_MASK_Cf_ZWJ));
 378 }
 379 static inline void
 380 _hb_glyph_info_flip_joiners (hb_glyph_info_t *info)
 381 {
 382   if (!_hb_glyph_info_is_unicode_format (info))
 383     return;
 384   info->unicode_props() ^= UPROPS_MASK_Cf_ZWNJ | UPROPS_MASK_Cf_ZWJ;
 385 }
 386
 387 /* lig_props: aka lig_id / lig_comp
 388  *
 389  * When a ligature is formed:
 390  *
 391  *   - The ligature glyph and any marks in between all the same newly allocated
 392  *     lig_id,
 393  *   - The ligature glyph will get lig_num_comps set to the number of components
 394  *   - The marks get lig_comp > 0, reflecting which component of the ligature
 395  *     they were applied to.
 396  *   - This is used in GPOS to attach marks to the right component of a ligature
 397  *     in MarkLigPos,
 398  *   - Note that when marks are ligated together, much of the above is skipped
 399  *     and the current lig_id reused.
 400  *
 401  * When a multiple-substitution is done:
 402  *
 403  *   - All resulting glyphs will have lig_id = 0,
 404  *   - The resulting glyphs will have lig_comp = 0, 1, 2, ... respectively.
 405  *   - This is used in GPOS to attach marks to the first component of a
 406  *     multiple substitution in MarkBasePos.
 407  *
 408  * The numbers are also used in GPOS to do mark-to-mark positioning only
 409  * to marks that belong to the same component of the same ligature.
 410  */
 411
 412 static inline void
 413 _hb_glyph_info_clear_lig_props (hb_glyph_info_t *info)
 414 {
 415   info->lig_props() = 0;
 416 }
 417
 418 #define IS_LIG_BASE 0x10
 419
 420 static inline void
 421 _hb_glyph_info_set_lig_props_for_ligature (hb_glyph_info_t *info,
 422                                            unsigned int lig_id,
 423                                            unsigned int lig_num_comps)
 424 {
 425   info->lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F);
 426 }
 427
 428 static inline void
 429 _hb_glyph_info_set_lig_props_for_mark (hb_glyph_info_t *info,
 430                                        unsigned int lig_id,
 431                                        unsigned int lig_comp)
 432 {
 433   info->lig_props() = (lig_id << 5) | (lig_comp & 0x0F);
 434 }
 435
 436 static inline void
 437 _hb_glyph_info_set_lig_props_for_component (hb_glyph_info_t *info, unsigned int comp)
 438 {
 439   _hb_glyph_info_set_lig_props_for_mark (info, 0, comp);
 440 }
 441
 442 static inline unsigned int
 443 _hb_glyph_info_get_lig_id (const hb_glyph_info_t *info)
 444 {
 445   return info->lig_props() >> 5;
 446 }
 447
 448 static inline bool
 449 _hb_glyph_info_ligated_internal (const hb_glyph_info_t *info)
 450 {
 451   return info->lig_props() & IS_LIG_BASE;
 452 }
 453
 454 static inline unsigned int
 455 _hb_glyph_info_get_lig_comp (const hb_glyph_info_t *info)
 456 {
 457   if (_hb_glyph_info_ligated_internal (info))
 458     return 0;
 459   else
 460     return info->lig_props() & 0x0F;
 461 }
 462
 463 static inline unsigned int
 464 _hb_glyph_info_get_lig_num_comps (const hb_glyph_info_t *info)
 465 {
 466   if ((info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) &&
 467       _hb_glyph_info_ligated_internal (info))
 468     return info->lig_props() & 0x0F;
 469   else
 470     return 1;
 471 }
 472
 473 static inline uint8_t
 474 _hb_allocate_lig_id (hb_buffer_t *buffer)
 475 {
 476   uint8_t lig_id = buffer->next_serial () & 0x07;
 477   if (unlikely (!lig_id))
 478     lig_id = _hb_allocate_lig_id (buffer); /* in case of overflow */
 479   return lig_id;
 480 }
 481
 482 /* glyph_props: */
 483
 484 static inline void
 485 _hb_glyph_info_set_glyph_props (hb_glyph_info_t *info, unsigned int props)
 486 {
 487   info->glyph_props() = props;
 488 }
 489
 490 static inline unsigned int
 491 _hb_glyph_info_get_glyph_props (const hb_glyph_info_t *info)
 492 {
 493   return info->glyph_props();
 494 }
 495
 496 static inline bool
 497 _hb_glyph_info_is_base_glyph (const hb_glyph_info_t *info)
 498 {
 499   return info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH;
 500 }
 501
 502 static inline bool
 503 _hb_glyph_info_is_ligature (const hb_glyph_info_t *info)
 504 {
 505   return info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE;
 506 }
 507
 508 static inline bool
 509 _hb_glyph_info_is_mark (const hb_glyph_info_t *info)
 510 {
 511   return info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MARK;
 512 }
 513
 514 static inline bool
 515 _hb_glyph_info_substituted (const hb_glyph_info_t *info)
 516 {
 517   return info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED;
 518 }
 519
 520 static inline bool
 521 _hb_glyph_info_ligated (const hb_glyph_info_t *info)
 522 {
 523   return info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATED;
 524 }
 525
 526 static inline bool
 527 _hb_glyph_info_multiplied (const hb_glyph_info_t *info)
 528 {
 529   return info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
 530 }
 531
 532 static inline bool
 533 _hb_glyph_info_ligated_and_didnt_multiply (const hb_glyph_info_t *info)
 534 {
 535   return _hb_glyph_info_ligated (info) && !_hb_glyph_info_multiplied (info);
 536 }
 537
 538 static inline void
 539 _hb_glyph_info_clear_ligated_and_multiplied (hb_glyph_info_t *info)
 540 {
 541   info->glyph_props() &= ~(HB_OT_LAYOUT_GLYPH_PROPS_LIGATED |
 542                            HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED);
 543 }
 544
 545 static inline void
 546 _hb_glyph_info_clear_substituted (hb_glyph_info_t *info)
 547 {
 548   info->glyph_props() &= ~(HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED);
 549 }
 550
 551 static inline bool
 552 _hb_clear_substitution_flags (const hb_ot_shape_plan_t *plan HB_UNUSED,
 553                               hb_font_t *font HB_UNUSED,
 554                               hb_buffer_t *buffer)
 555 {
 556   hb_glyph_info_t *info = buffer->info;
 557   unsigned int count = buffer->len;
 558   for (unsigned int i = 0; i < count; i++)
 559     _hb_glyph_info_clear_substituted (&info[i]);
 560   return false;
 561 }
 562
 563
 564 /* Allocation / deallocation. */
 565
 566 static inline void
 567 _hb_buffer_allocate_unicode_vars (hb_buffer_t *buffer)
 568 {
 569   HB_BUFFER_ALLOCATE_VAR (buffer, unicode_props);
 570 }
 571
 572 static inline void
 573 _hb_buffer_deallocate_unicode_vars (hb_buffer_t *buffer)
 574 {
 575   HB_BUFFER_DEALLOCATE_VAR (buffer, unicode_props);
 576 }
 577
 578 static inline void
 579 _hb_buffer_assert_unicode_vars (hb_buffer_t *buffer)
 580 {
 581   HB_BUFFER_ASSERT_VAR (buffer, unicode_props);
 582 }
 583
 584 static inline void
 585 _hb_buffer_allocate_gsubgpos_vars (hb_buffer_t *buffer)
 586 {
 587   HB_BUFFER_ALLOCATE_VAR (buffer, glyph_props);
 588   HB_BUFFER_ALLOCATE_VAR (buffer, lig_props);
 589 }
 590
 591 static inline void
 592 _hb_buffer_deallocate_gsubgpos_vars (hb_buffer_t *buffer)
 593 {
 594   HB_BUFFER_DEALLOCATE_VAR (buffer, lig_props);
 595   HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_props);
 596 }
 597
 598 static inline void
 599 _hb_buffer_assert_gsubgpos_vars (hb_buffer_t *buffer)
 600 {
 601   HB_BUFFER_ASSERT_VAR (buffer, glyph_props);
 602   HB_BUFFER_ASSERT_VAR (buffer, lig_props);
 603 }
 604
 605 /* Make sure no one directly touches our props... */
 606 #undef unicode_props0
 607 #undef unicode_props1
 608 #undef lig_props
 609 #undef glyph_props
 610
 611 #endif /* HB_OT_LAYOUT_HH */