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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 HB_INTERNAL bool
100 hb_ot_layout_lookup_would_substitute_fast (hb_face_t            *face,
101 					   unsigned int          lookup_index,
102 					   const hb_codepoint_t *glyphs,
103 					   unsigned int          glyphs_length,
104 					   bool                  zero_context);
105 
106 
107 /* Should be called before all the substitute_lookup's are done. */
108 HB_INTERNAL void
109 hb_ot_layout_substitute_start (hb_font_t    *font,
110 			       hb_buffer_t  *buffer);
111 
112 HB_INTERNAL void
113 hb_ot_layout_delete_glyphs_inplace (hb_buffer_t *buffer,
114 				    bool (*filter) (const hb_glyph_info_t *info));
115 
116 namespace OT {
117   struct hb_ot_apply_context_t;
118   struct SubstLookup;
119   struct hb_ot_layout_lookup_accelerator_t;
120 }
121 
122 HB_INTERNAL void
123 hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c,
124 				const OT::SubstLookup &lookup,
125 				const OT::hb_ot_layout_lookup_accelerator_t &accel);
126 
127 
128 /* Should be called before all the position_lookup's are done. */
129 HB_INTERNAL void
130 hb_ot_layout_position_start (hb_font_t    *font,
131 			     hb_buffer_t  *buffer);
132 
133 /* Should be called after all the position_lookup's are done, to fini advances. */
134 HB_INTERNAL void
135 hb_ot_layout_position_finish_advances (hb_font_t    *font,
136 				       hb_buffer_t  *buffer);
137 
138 /* Should be called after hb_ot_layout_position_finish_advances, to fini offsets. */
139 HB_INTERNAL void
140 hb_ot_layout_position_finish_offsets (hb_font_t    *font,
141 				      hb_buffer_t  *buffer);
142 
143 
144 /*
145  * Buffer var routines.
146  */
147 
148 /* buffer var allocations, used during the entire shaping process */
149 #define unicode_props()		var2.u16[0]
150 
151 /* buffer var allocations, used during the GSUB/GPOS processing */
152 #define glyph_props()		var1.u16[0] /* GDEF glyph properties */
153 #define lig_props()		var1.u8[2] /* GSUB/GPOS ligature tracking */
154 #define syllable()		var1.u8[3] /* GSUB/GPOS shaping boundaries */
155 
156 
157 /* Loop over syllables. Based on foreach_cluster(). */
158 #define foreach_syllable(buffer, start, end) \
159   for (unsigned int \
160        _count = buffer->len, \
161        start = 0, end = _count ? _hb_next_syllable (buffer, 0) : 0; \
162        start < _count; \
163        start = end, end = _hb_next_syllable (buffer, start))
164 
165 static inline unsigned int
_hb_next_syllable(hb_buffer_t * buffer,unsigned int start)166 _hb_next_syllable (hb_buffer_t *buffer, unsigned int start)
167 {
168   hb_glyph_info_t *info = buffer->info;
169   unsigned int count = buffer->len;
170 
171   unsigned int syllable = info[start].syllable();
172   while (++start < count && syllable == info[start].syllable())
173     ;
174 
175   return start;
176 }
177 
178 
179 /* unicode_props */
180 
181 /* Design:
182  * unicode_props() is a two-byte number.  The low byte includes:
183  * - General_Category: 5 bits.
184  * - A bit each for:
185  *   * Is it Default_Ignorable(); we have a modified Default_Ignorable().
186  *   * Whether it's one of the three Mongolian Free Variation Selectors,
187  *     CGJ, or other characters that are hidden but should not be ignored
188  *     like most other Default_Ignorable()s do during matching.
189  *   * Whether it's a grapheme continuation.
190  *
191  * The high-byte has different meanings, switched by the Gen-Cat:
192  * - For Mn,Mc,Me: the modified Combining_Class.
193  * - For Cf: whether it's ZWJ, ZWNJ, or something else.
194  * - For Ws: index of which space character this is, if space fallback
195  *   is needed, ie. we don't set this by default, only if asked to.
196  */
197 
198 enum hb_unicode_props_flags_t {
199   UPROPS_MASK_GEN_CAT	= 0x001Fu,
200   UPROPS_MASK_IGNORABLE	= 0x0020u,
201   UPROPS_MASK_HIDDEN	= 0x0040u, /* MONGOLIAN FREE VARIATION SELECTOR 1..3, or TAG characters */
202   UPROPS_MASK_CONTINUATION=0x0080u,
203 
204   /* If GEN_CAT=FORMAT, top byte masks: */
205   UPROPS_MASK_Cf_ZWJ	= 0x0100u,
206   UPROPS_MASK_Cf_ZWNJ	= 0x0200u
207 };
208 HB_MARK_AS_FLAG_T (hb_unicode_props_flags_t);
209 
210 static inline void
_hb_glyph_info_set_unicode_props(hb_glyph_info_t * info,hb_buffer_t * buffer)211 _hb_glyph_info_set_unicode_props (hb_glyph_info_t *info, hb_buffer_t *buffer)
212 {
213   hb_unicode_funcs_t *unicode = buffer->unicode;
214   unsigned int u = info->codepoint;
215   unsigned int gen_cat = (unsigned int) unicode->general_category (u);
216   unsigned int props = gen_cat;
217 
218   if (u >= 0x80)
219   {
220     buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII;
221 
222     if (unlikely (unicode->is_default_ignorable (u)))
223     {
224       buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES;
225       props |=  UPROPS_MASK_IGNORABLE;
226       if (u == 0x200Cu) props |= UPROPS_MASK_Cf_ZWNJ;
227       else if (u == 0x200Du) props |= UPROPS_MASK_Cf_ZWJ;
228       /* Mongolian Free Variation Selectors need to be remembered
229        * because although we need to hide them like default-ignorables,
230        * they need to non-ignorable during shaping.  This is similar to
231        * what we do for joiners in Indic-like shapers, but since the
232        * FVSes are GC=Mn, we have use a separate bit to remember them.
233        * Fixes:
234        * https://github.com/harfbuzz/harfbuzz/issues/234 */
235       else if (unlikely (hb_in_range (u, 0x180Bu, 0x180Du))) props |= UPROPS_MASK_HIDDEN;
236       /* TAG characters need similar treatment. Fixes:
237        * https://github.com/harfbuzz/harfbuzz/issues/463 */
238       else if (unlikely (hb_in_range (u, 0xE0020u, 0xE007Fu))) props |= UPROPS_MASK_HIDDEN;
239       /* COMBINING GRAPHEME JOINER should not be skipped; at least some times.
240        * https://github.com/harfbuzz/harfbuzz/issues/554 */
241       else if (unlikely (u == 0x034Fu))
242       {
243 	buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_CGJ;
244 	props |= UPROPS_MASK_HIDDEN;
245       }
246     }
247 
248     if (unlikely (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (gen_cat)))
249     {
250       props |= UPROPS_MASK_CONTINUATION;
251       props |= unicode->modified_combining_class (u)<<8;
252     }
253   }
254 
255   info->unicode_props() = props;
256 }
257 
258 static inline void
_hb_glyph_info_set_general_category(hb_glyph_info_t * info,hb_unicode_general_category_t gen_cat)259 _hb_glyph_info_set_general_category (hb_glyph_info_t *info,
260 				     hb_unicode_general_category_t gen_cat)
261 {
262   /* Clears top-byte. */
263   info->unicode_props() = (unsigned int) gen_cat | (info->unicode_props() & (0xFF & ~UPROPS_MASK_GEN_CAT));
264 }
265 
266 static inline hb_unicode_general_category_t
_hb_glyph_info_get_general_category(const hb_glyph_info_t * info)267 _hb_glyph_info_get_general_category (const hb_glyph_info_t *info)
268 {
269   return (hb_unicode_general_category_t) (info->unicode_props() & UPROPS_MASK_GEN_CAT);
270 }
271 
272 static inline bool
_hb_glyph_info_is_unicode_mark(const hb_glyph_info_t * info)273 _hb_glyph_info_is_unicode_mark (const hb_glyph_info_t *info)
274 {
275   return HB_UNICODE_GENERAL_CATEGORY_IS_MARK (info->unicode_props() & UPROPS_MASK_GEN_CAT);
276 }
277 static inline void
_hb_glyph_info_set_modified_combining_class(hb_glyph_info_t * info,unsigned int modified_class)278 _hb_glyph_info_set_modified_combining_class (hb_glyph_info_t *info,
279 					     unsigned int modified_class)
280 {
281   if (unlikely (!_hb_glyph_info_is_unicode_mark (info)))
282     return;
283   info->unicode_props() = (modified_class<<8) | (info->unicode_props() & 0xFF);
284 }
285 static inline unsigned int
_hb_glyph_info_get_modified_combining_class(const hb_glyph_info_t * info)286 _hb_glyph_info_get_modified_combining_class (const hb_glyph_info_t *info)
287 {
288   return _hb_glyph_info_is_unicode_mark (info) ? info->unicode_props()>>8 : 0;
289 }
290 #define info_cc(info) (_hb_glyph_info_get_modified_combining_class (&(info)))
291 
292 static inline bool
_hb_glyph_info_is_unicode_space(const hb_glyph_info_t * info)293 _hb_glyph_info_is_unicode_space (const hb_glyph_info_t *info)
294 {
295   return _hb_glyph_info_get_general_category (info) ==
296 	 HB_UNICODE_GENERAL_CATEGORY_SPACE_SEPARATOR;
297 }
298 static inline void
_hb_glyph_info_set_unicode_space_fallback_type(hb_glyph_info_t * info,hb_unicode_funcs_t::space_t s)299 _hb_glyph_info_set_unicode_space_fallback_type (hb_glyph_info_t *info, hb_unicode_funcs_t::space_t s)
300 {
301   if (unlikely (!_hb_glyph_info_is_unicode_space (info)))
302     return;
303   info->unicode_props() = (((unsigned int) s)<<8) | (info->unicode_props() & 0xFF);
304 }
305 static inline hb_unicode_funcs_t::space_t
_hb_glyph_info_get_unicode_space_fallback_type(const hb_glyph_info_t * info)306 _hb_glyph_info_get_unicode_space_fallback_type (const hb_glyph_info_t *info)
307 {
308   return _hb_glyph_info_is_unicode_space (info) ?
309 	 (hb_unicode_funcs_t::space_t) (info->unicode_props()>>8) :
310 	 hb_unicode_funcs_t::NOT_SPACE;
311 }
312 
313 static inline bool _hb_glyph_info_ligated (const hb_glyph_info_t *info);
314 
315 static inline bool
_hb_glyph_info_is_default_ignorable(const hb_glyph_info_t * info)316 _hb_glyph_info_is_default_ignorable (const hb_glyph_info_t *info)
317 {
318   return (info->unicode_props() & UPROPS_MASK_IGNORABLE) &&
319 	 !_hb_glyph_info_ligated (info);
320 }
321 static inline bool
_hb_glyph_info_is_default_ignorable_and_not_hidden(const hb_glyph_info_t * info)322 _hb_glyph_info_is_default_ignorable_and_not_hidden (const hb_glyph_info_t *info)
323 {
324   return ((info->unicode_props() & (UPROPS_MASK_IGNORABLE|UPROPS_MASK_HIDDEN))
325 	  == UPROPS_MASK_IGNORABLE) &&
326 	 !_hb_glyph_info_ligated (info);
327 }
328 static inline void
_hb_glyph_info_unhide(hb_glyph_info_t * info)329 _hb_glyph_info_unhide (hb_glyph_info_t *info)
330 {
331   info->unicode_props() &= ~ UPROPS_MASK_HIDDEN;
332 }
333 
334 static inline void
_hb_glyph_info_set_continuation(hb_glyph_info_t * info)335 _hb_glyph_info_set_continuation (hb_glyph_info_t *info)
336 {
337   info->unicode_props() |= UPROPS_MASK_CONTINUATION;
338 }
339 static inline void
_hb_glyph_info_reset_continuation(hb_glyph_info_t * info)340 _hb_glyph_info_reset_continuation (hb_glyph_info_t *info)
341 {
342   info->unicode_props() &= ~ UPROPS_MASK_CONTINUATION;
343 }
344 static inline bool
_hb_glyph_info_is_continuation(const hb_glyph_info_t * info)345 _hb_glyph_info_is_continuation (const hb_glyph_info_t *info)
346 {
347   return info->unicode_props() & UPROPS_MASK_CONTINUATION;
348 }
349 /* Loop over grapheme. Based on foreach_cluster(). */
350 #define foreach_grapheme(buffer, start, end) \
351   for (unsigned int \
352        _count = buffer->len, \
353        start = 0, end = _count ? _hb_next_grapheme (buffer, 0) : 0; \
354        start < _count; \
355        start = end, end = _hb_next_grapheme (buffer, start))
356 
357 static inline unsigned int
_hb_next_grapheme(hb_buffer_t * buffer,unsigned int start)358 _hb_next_grapheme (hb_buffer_t *buffer, unsigned int start)
359 {
360   hb_glyph_info_t *info = buffer->info;
361   unsigned int count = buffer->len;
362 
363   while (++start < count && _hb_glyph_info_is_continuation (&info[start]))
364     ;
365 
366   return start;
367 }
368 
369 static inline bool
_hb_glyph_info_is_unicode_format(const hb_glyph_info_t * info)370 _hb_glyph_info_is_unicode_format (const hb_glyph_info_t *info)
371 {
372   return _hb_glyph_info_get_general_category (info) ==
373 	 HB_UNICODE_GENERAL_CATEGORY_FORMAT;
374 }
375 static inline bool
_hb_glyph_info_is_zwnj(const hb_glyph_info_t * info)376 _hb_glyph_info_is_zwnj (const hb_glyph_info_t *info)
377 {
378   return _hb_glyph_info_is_unicode_format (info) && (info->unicode_props() & UPROPS_MASK_Cf_ZWNJ);
379 }
380 static inline bool
_hb_glyph_info_is_zwj(const hb_glyph_info_t * info)381 _hb_glyph_info_is_zwj (const hb_glyph_info_t *info)
382 {
383   return _hb_glyph_info_is_unicode_format (info) && (info->unicode_props() & UPROPS_MASK_Cf_ZWJ);
384 }
385 static inline bool
_hb_glyph_info_is_joiner(const hb_glyph_info_t * info)386 _hb_glyph_info_is_joiner (const hb_glyph_info_t *info)
387 {
388   return _hb_glyph_info_is_unicode_format (info) && (info->unicode_props() & (UPROPS_MASK_Cf_ZWNJ|UPROPS_MASK_Cf_ZWJ));
389 }
390 static inline void
_hb_glyph_info_flip_joiners(hb_glyph_info_t * info)391 _hb_glyph_info_flip_joiners (hb_glyph_info_t *info)
392 {
393   if (!_hb_glyph_info_is_unicode_format (info))
394     return;
395   info->unicode_props() ^= UPROPS_MASK_Cf_ZWNJ | UPROPS_MASK_Cf_ZWJ;
396 }
397 
398 /* lig_props: aka lig_id / lig_comp
399  *
400  * When a ligature is formed:
401  *
402  *   - The ligature glyph and any marks in between all the same newly allocated
403  *     lig_id,
404  *   - The ligature glyph will get lig_num_comps set to the number of components
405  *   - The marks get lig_comp > 0, reflecting which component of the ligature
406  *     they were applied to.
407  *   - This is used in GPOS to attach marks to the right component of a ligature
408  *     in MarkLigPos,
409  *   - Note that when marks are ligated together, much of the above is skipped
410  *     and the current lig_id reused.
411  *
412  * When a multiple-substitution is done:
413  *
414  *   - All resulting glyphs will have lig_id = 0,
415  *   - The resulting glyphs will have lig_comp = 0, 1, 2, ... respectively.
416  *   - This is used in GPOS to attach marks to the first component of a
417  *     multiple substitution in MarkBasePos.
418  *
419  * The numbers are also used in GPOS to do mark-to-mark positioning only
420  * to marks that belong to the same component of the same ligature.
421  */
422 
423 static inline void
_hb_glyph_info_clear_lig_props(hb_glyph_info_t * info)424 _hb_glyph_info_clear_lig_props (hb_glyph_info_t *info)
425 {
426   info->lig_props() = 0;
427 }
428 
429 #define IS_LIG_BASE 0x10
430 
431 static inline void
_hb_glyph_info_set_lig_props_for_ligature(hb_glyph_info_t * info,unsigned int lig_id,unsigned int lig_num_comps)432 _hb_glyph_info_set_lig_props_for_ligature (hb_glyph_info_t *info,
433 					   unsigned int lig_id,
434 					   unsigned int lig_num_comps)
435 {
436   info->lig_props() = (lig_id << 5) | IS_LIG_BASE | (lig_num_comps & 0x0F);
437 }
438 
439 static inline void
_hb_glyph_info_set_lig_props_for_mark(hb_glyph_info_t * info,unsigned int lig_id,unsigned int lig_comp)440 _hb_glyph_info_set_lig_props_for_mark (hb_glyph_info_t *info,
441 				       unsigned int lig_id,
442 				       unsigned int lig_comp)
443 {
444   info->lig_props() = (lig_id << 5) | (lig_comp & 0x0F);
445 }
446 
447 static inline void
_hb_glyph_info_set_lig_props_for_component(hb_glyph_info_t * info,unsigned int comp)448 _hb_glyph_info_set_lig_props_for_component (hb_glyph_info_t *info, unsigned int comp)
449 {
450   _hb_glyph_info_set_lig_props_for_mark (info, 0, comp);
451 }
452 
453 static inline unsigned int
_hb_glyph_info_get_lig_id(const hb_glyph_info_t * info)454 _hb_glyph_info_get_lig_id (const hb_glyph_info_t *info)
455 {
456   return info->lig_props() >> 5;
457 }
458 
459 static inline bool
_hb_glyph_info_ligated_internal(const hb_glyph_info_t * info)460 _hb_glyph_info_ligated_internal (const hb_glyph_info_t *info)
461 {
462   return !!(info->lig_props() & IS_LIG_BASE);
463 }
464 
465 static inline unsigned int
_hb_glyph_info_get_lig_comp(const hb_glyph_info_t * info)466 _hb_glyph_info_get_lig_comp (const hb_glyph_info_t *info)
467 {
468   if (_hb_glyph_info_ligated_internal (info))
469     return 0;
470   else
471     return info->lig_props() & 0x0F;
472 }
473 
474 static inline unsigned int
_hb_glyph_info_get_lig_num_comps(const hb_glyph_info_t * info)475 _hb_glyph_info_get_lig_num_comps (const hb_glyph_info_t *info)
476 {
477   if ((info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE) &&
478       _hb_glyph_info_ligated_internal (info))
479     return info->lig_props() & 0x0F;
480   else
481     return 1;
482 }
483 
484 static inline uint8_t
_hb_allocate_lig_id(hb_buffer_t * buffer)485 _hb_allocate_lig_id (hb_buffer_t *buffer) {
486   uint8_t lig_id = buffer->next_serial () & 0x07;
487   if (unlikely (!lig_id))
488     lig_id = _hb_allocate_lig_id (buffer); /* in case of overflow */
489   return lig_id;
490 }
491 
492 /* glyph_props: */
493 
494 static inline void
_hb_glyph_info_set_glyph_props(hb_glyph_info_t * info,unsigned int props)495 _hb_glyph_info_set_glyph_props (hb_glyph_info_t *info, unsigned int props)
496 {
497   info->glyph_props() = props;
498 }
499 
500 static inline unsigned int
_hb_glyph_info_get_glyph_props(const hb_glyph_info_t * info)501 _hb_glyph_info_get_glyph_props (const hb_glyph_info_t *info)
502 {
503   return info->glyph_props();
504 }
505 
506 static inline bool
_hb_glyph_info_is_base_glyph(const hb_glyph_info_t * info)507 _hb_glyph_info_is_base_glyph (const hb_glyph_info_t *info)
508 {
509   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH);
510 }
511 
512 static inline bool
_hb_glyph_info_is_ligature(const hb_glyph_info_t * info)513 _hb_glyph_info_is_ligature (const hb_glyph_info_t *info)
514 {
515   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE);
516 }
517 
518 static inline bool
_hb_glyph_info_is_mark(const hb_glyph_info_t * info)519 _hb_glyph_info_is_mark (const hb_glyph_info_t *info)
520 {
521   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MARK);
522 }
523 
524 static inline bool
_hb_glyph_info_substituted(const hb_glyph_info_t * info)525 _hb_glyph_info_substituted (const hb_glyph_info_t *info)
526 {
527   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED);
528 }
529 
530 static inline bool
_hb_glyph_info_ligated(const hb_glyph_info_t * info)531 _hb_glyph_info_ligated (const hb_glyph_info_t *info)
532 {
533   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_LIGATED);
534 }
535 
536 static inline bool
_hb_glyph_info_multiplied(const hb_glyph_info_t * info)537 _hb_glyph_info_multiplied (const hb_glyph_info_t *info)
538 {
539   return !!(info->glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED);
540 }
541 
542 static inline bool
_hb_glyph_info_ligated_and_didnt_multiply(const hb_glyph_info_t * info)543 _hb_glyph_info_ligated_and_didnt_multiply (const hb_glyph_info_t *info)
544 {
545   return _hb_glyph_info_ligated (info) && !_hb_glyph_info_multiplied (info);
546 }
547 
548 static inline void
_hb_glyph_info_clear_ligated_and_multiplied(hb_glyph_info_t * info)549 _hb_glyph_info_clear_ligated_and_multiplied (hb_glyph_info_t *info)
550 {
551   info->glyph_props() &= ~(HB_OT_LAYOUT_GLYPH_PROPS_LIGATED |
552 			   HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED);
553 }
554 
555 static inline void
_hb_glyph_info_clear_substituted(hb_glyph_info_t * info)556 _hb_glyph_info_clear_substituted (hb_glyph_info_t *info)
557 {
558   info->glyph_props() &= ~(HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED);
559 }
560 
561 
562 /* Allocation / deallocation. */
563 
564 static inline void
_hb_buffer_allocate_unicode_vars(hb_buffer_t * buffer)565 _hb_buffer_allocate_unicode_vars (hb_buffer_t *buffer)
566 {
567   HB_BUFFER_ALLOCATE_VAR (buffer, unicode_props);
568 }
569 
570 static inline void
_hb_buffer_deallocate_unicode_vars(hb_buffer_t * buffer)571 _hb_buffer_deallocate_unicode_vars (hb_buffer_t *buffer)
572 {
573   HB_BUFFER_DEALLOCATE_VAR (buffer, unicode_props);
574 }
575 
576 static inline void
_hb_buffer_assert_unicode_vars(hb_buffer_t * buffer)577 _hb_buffer_assert_unicode_vars (hb_buffer_t *buffer)
578 {
579   HB_BUFFER_ASSERT_VAR (buffer, unicode_props);
580 }
581 
582 static inline void
_hb_buffer_allocate_gsubgpos_vars(hb_buffer_t * buffer)583 _hb_buffer_allocate_gsubgpos_vars (hb_buffer_t *buffer)
584 {
585   HB_BUFFER_ALLOCATE_VAR (buffer, glyph_props);
586   HB_BUFFER_ALLOCATE_VAR (buffer, lig_props);
587   HB_BUFFER_ALLOCATE_VAR (buffer, syllable);
588 }
589 
590 static inline void
_hb_buffer_deallocate_gsubgpos_vars(hb_buffer_t * buffer)591 _hb_buffer_deallocate_gsubgpos_vars (hb_buffer_t *buffer)
592 {
593   HB_BUFFER_DEALLOCATE_VAR (buffer, syllable);
594   HB_BUFFER_DEALLOCATE_VAR (buffer, lig_props);
595   HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_props);
596 }
597 
598 static inline void
_hb_buffer_assert_gsubgpos_vars(hb_buffer_t * buffer)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   HB_BUFFER_ASSERT_VAR (buffer, syllable);
604 }
605 
606 /* Make sure no one directly touches our props... */
607 #undef unicode_props0
608 #undef unicode_props1
609 #undef lig_props
610 #undef glyph_props
611 
612 #endif /* HB_OT_LAYOUT_HH */
613