2 * Copyright © 1998-2004 David Turner and Werner Lemberg
3 * Copyright © 2006 Behdad Esfahbod
4 * Copyright © 2007,2008,2009 Red Hat, Inc.
6 * This is part of HarfBuzz, a text shaping library.
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
26 * Red Hat Author(s): Behdad Esfahbod
29 #define HB_OT_LAYOUT_CC
31 #include "hb-ot-layout-private.hh"
33 #include "hb-ot-layout-gdef-private.hh"
34 #include "hb-ot-layout-gsub-private.hh"
35 #include "hb-ot-layout-gpos-private.hh"
36 #include "hb-ot-head-private.hh"
46 _hb_ot_layout_create (hb_face_t *face)
48 /* Remove this object altogether */
49 hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t));
51 layout->gdef_blob = Sanitizer<GDEF>::sanitize (hb_face_reference_table (face, HB_OT_TAG_GDEF));
52 layout->gdef = Sanitizer<GDEF>::lock_instance (layout->gdef_blob);
54 layout->gsub_blob = Sanitizer<GSUB>::sanitize (hb_face_reference_table (face, HB_OT_TAG_GSUB));
55 layout->gsub = Sanitizer<GSUB>::lock_instance (layout->gsub_blob);
57 layout->gpos_blob = Sanitizer<GPOS>::sanitize (hb_face_reference_table (face, HB_OT_TAG_GPOS));
58 layout->gpos = Sanitizer<GPOS>::lock_instance (layout->gpos_blob);
60 layout->head_blob = Sanitizer<head>::sanitize (hb_face_reference_table (face, HB_OT_TAG_head));
61 layout->head = Sanitizer<head>::lock_instance (layout->head_blob);
67 _hb_ot_layout_destroy (hb_ot_layout_t *layout)
69 hb_blob_unlock (layout->gdef_blob);
70 hb_blob_unlock (layout->gsub_blob);
71 hb_blob_unlock (layout->gpos_blob);
72 hb_blob_unlock (layout->head_blob);
74 hb_blob_destroy (layout->gdef_blob);
75 hb_blob_destroy (layout->gsub_blob);
76 hb_blob_destroy (layout->gpos_blob);
77 hb_blob_destroy (layout->head_blob);
82 static inline const GDEF&
83 _get_gdef (hb_face_t *face)
85 return likely (face->ot_layout && face->ot_layout->gdef) ? *face->ot_layout->gdef : Null(GDEF);
87 static inline const GSUB&
88 _get_gsub (hb_face_t *face)
90 return likely (face->ot_layout && face->ot_layout->gsub) ? *face->ot_layout->gsub : Null(GSUB);
92 static inline const GPOS&
93 _get_gpos (hb_face_t *face)
95 return likely (face->ot_layout && face->ot_layout->gpos) ? *face->ot_layout->gpos : Null(GPOS);
97 static inline const head&
98 _get_head (hb_face_t *face)
100 return likely (face->ot_layout && face->ot_layout->head) ? *face->ot_layout->head : Null(head);
109 hb_ot_layout_has_glyph_classes (hb_face_t *face)
111 return _get_gdef (face).has_glyph_classes ();
115 _hb_ot_layout_get_glyph_property (hb_face_t *face,
116 hb_glyph_info_t *info)
118 if (!info->props_cache())
120 const GDEF &gdef = _get_gdef (face);
121 info->props_cache() = gdef.get_glyph_props (info->codepoint);
124 return info->props_cache();
128 _hb_ot_layout_match_properties (hb_face_t *face,
129 hb_codepoint_t codepoint,
130 unsigned int glyph_props,
131 unsigned int lookup_props)
133 /* Not covered, if, for example, glyph class is ligature and
134 * lookup_props includes LookupFlags::IgnoreLigatures
136 if (glyph_props & lookup_props & LookupFlag::IgnoreFlags)
139 if (glyph_props & HB_OT_LAYOUT_GLYPH_CLASS_MARK)
141 /* If using mark filtering sets, the high short of
142 * lookup_props has the set index.
144 if (lookup_props & LookupFlag::UseMarkFilteringSet)
145 return _get_gdef (face).mark_set_covers (lookup_props >> 16, codepoint);
147 /* The second byte of lookup_props has the meaning
148 * "ignore marks of attachment type different than
149 * the attachment type specified."
151 if (lookup_props & LookupFlag::MarkAttachmentType && glyph_props & LookupFlag::MarkAttachmentType)
152 return (lookup_props & LookupFlag::MarkAttachmentType) == (glyph_props & LookupFlag::MarkAttachmentType);
159 _hb_ot_layout_check_glyph_property (hb_face_t *face,
160 hb_glyph_info_t *ginfo,
161 unsigned int lookup_props,
162 unsigned int *property_out)
164 unsigned int property;
166 property = _hb_ot_layout_get_glyph_property (face, ginfo);
167 (void) (property_out && (*property_out = property));
169 return _hb_ot_layout_match_properties (face, ginfo->codepoint, property, lookup_props);
173 _hb_ot_layout_skip_mark (hb_face_t *face,
174 hb_glyph_info_t *ginfo,
175 unsigned int lookup_props,
176 unsigned int *property_out)
178 unsigned int property;
180 property = _hb_ot_layout_get_glyph_property (face, ginfo);
181 (void) (property_out && (*property_out = property));
183 /* If it's a mark, skip it we don't accept it. */
184 if (unlikely (property & HB_OT_LAYOUT_GLYPH_CLASS_MARK))
185 return !_hb_ot_layout_match_properties (face, ginfo->codepoint, property, lookup_props);
187 /* If not a mark, don't skip. */
194 hb_ot_layout_get_attach_points (hb_face_t *face,
195 hb_codepoint_t glyph,
196 unsigned int start_offset,
197 unsigned int *point_count /* IN/OUT */,
198 unsigned int *point_array /* OUT */)
200 return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array);
204 hb_ot_layout_get_ligature_carets (hb_font_t *font,
205 hb_direction_t direction,
206 hb_codepoint_t glyph,
207 unsigned int start_offset,
208 unsigned int *caret_count /* IN/OUT */,
209 int *caret_array /* OUT */)
211 hb_ot_layout_context_t c;
214 return _get_gdef (c.face).get_lig_carets (&c, direction, glyph, start_offset, caret_count, caret_array);
221 static const GSUBGPOS&
222 get_gsubgpos_table (hb_face_t *face,
226 case HB_OT_TAG_GSUB: return _get_gsub (face);
227 case HB_OT_TAG_GPOS: return _get_gpos (face);
228 default: return Null(GSUBGPOS);
234 hb_ot_layout_table_get_script_tags (hb_face_t *face,
236 unsigned int start_offset,
237 unsigned int *script_count /* IN/OUT */,
238 hb_tag_t *script_tags /* OUT */)
240 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
242 return g.get_script_tags (start_offset, script_count, script_tags);
246 hb_ot_layout_table_find_script (hb_face_t *face,
249 unsigned int *script_index)
251 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
252 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
254 if (g.find_script_index (script_tag, script_index))
257 /* try finding 'DFLT' */
258 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
261 /* try with 'dflt'; MS site has had typos and many fonts use it now :(.
262 * including many versions of DejaVu Sans Mono! */
263 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
266 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
271 hb_ot_layout_table_choose_script (hb_face_t *face,
273 const hb_tag_t *script_tags,
274 unsigned int *script_index)
276 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
277 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
281 if (g.find_script_index (*script_tags, script_index))
286 /* try finding 'DFLT' */
287 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
290 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
291 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
294 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
299 hb_ot_layout_table_get_feature_tags (hb_face_t *face,
301 unsigned int start_offset,
302 unsigned int *feature_count /* IN/OUT */,
303 hb_tag_t *feature_tags /* OUT */)
305 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
307 return g.get_feature_tags (start_offset, feature_count, feature_tags);
312 hb_ot_layout_script_get_language_tags (hb_face_t *face,
314 unsigned int script_index,
315 unsigned int start_offset,
316 unsigned int *language_count /* IN/OUT */,
317 hb_tag_t *language_tags /* OUT */)
319 const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
321 return s.get_lang_sys_tags (start_offset, language_count, language_tags);
325 hb_ot_layout_script_find_language (hb_face_t *face,
327 unsigned int script_index,
328 hb_tag_t language_tag,
329 unsigned int *language_index)
331 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
332 const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
334 if (s.find_lang_sys_index (language_tag, language_index))
337 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
338 if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
341 if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
346 hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
348 unsigned int script_index,
349 unsigned int language_index,
350 unsigned int *feature_index)
352 const LangSys &l = get_gsubgpos_table (face, table_tag).get_script (script_index).get_lang_sys (language_index);
354 if (feature_index) *feature_index = l.get_required_feature_index ();
356 return l.has_required_feature ();
360 hb_ot_layout_language_get_feature_indexes (hb_face_t *face,
362 unsigned int script_index,
363 unsigned int language_index,
364 unsigned int start_offset,
365 unsigned int *feature_count /* IN/OUT */,
366 unsigned int *feature_indexes /* OUT */)
368 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
369 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
371 return l.get_feature_indexes (start_offset, feature_count, feature_indexes);
375 hb_ot_layout_language_get_feature_tags (hb_face_t *face,
377 unsigned int script_index,
378 unsigned int language_index,
379 unsigned int start_offset,
380 unsigned int *feature_count /* IN/OUT */,
381 hb_tag_t *feature_tags /* OUT */)
383 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
384 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
386 ASSERT_STATIC (sizeof (unsigned int) == sizeof (hb_tag_t));
387 unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags);
390 unsigned int count = *feature_count;
391 for (unsigned int i = 0; i < count; i++)
392 feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]);
400 hb_ot_layout_language_find_feature (hb_face_t *face,
402 unsigned int script_index,
403 unsigned int language_index,
404 hb_tag_t feature_tag,
405 unsigned int *feature_index)
407 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
408 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
409 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
411 unsigned int num_features = l.get_feature_count ();
412 for (unsigned int i = 0; i < num_features; i++) {
413 unsigned int f_index = l.get_feature_index (i);
415 if (feature_tag == g.get_feature_tag (f_index)) {
416 if (feature_index) *feature_index = f_index;
421 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
426 hb_ot_layout_feature_get_lookup_indexes (hb_face_t *face,
428 unsigned int feature_index,
429 unsigned int start_offset,
430 unsigned int *lookup_count /* IN/OUT */,
431 unsigned int *lookup_indexes /* OUT */)
433 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
434 const Feature &f = g.get_feature (feature_index);
436 return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
445 hb_ot_layout_has_substitution (hb_face_t *face)
447 return &_get_gsub (face) != &Null(GSUB);
451 hb_ot_layout_substitute_lookup (hb_face_t *face,
453 unsigned int lookup_index,
456 hb_ot_layout_context_t c;
459 return _get_gsub (face).substitute_lookup (&c, buffer, lookup_index, mask);
468 hb_ot_layout_has_positioning (hb_face_t *face)
470 return &_get_gpos (face) != &Null(GPOS);
474 hb_ot_layout_position_start (hb_buffer_t *buffer)
476 buffer->clear_positions ();
480 hb_ot_layout_position_lookup (hb_font_t *font,
482 unsigned int lookup_index,
485 hb_ot_layout_context_t c;
488 return _get_gpos (c.face).position_lookup (&c, buffer, lookup_index, mask);
492 hb_ot_layout_position_finish (hb_buffer_t *buffer)
494 GPOS::position_finish (buffer);
503 _hb_ot_layout_get_upem (hb_face_t *face)
505 return _get_head (face).get_upem ();