2 * Copyright (C) 1998-2004 David Turner and Werner Lemberg
3 * Copyright (C) 2006 Behdad Esfahbod
4 * Copyright (C) 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"
45 _hb_ot_layout_new (hb_face_t *face)
47 /* Remove this object altogether */
48 hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t));
50 layout->gdef_blob = Sanitizer<GDEF>::sanitize (hb_face_get_table (face, HB_OT_TAG_GDEF));
51 layout->gdef = Sanitizer<GDEF>::lock_instance (layout->gdef_blob);
53 layout->gsub_blob = Sanitizer<GSUB>::sanitize (hb_face_get_table (face, HB_OT_TAG_GSUB));
54 layout->gsub = Sanitizer<GSUB>::lock_instance (layout->gsub_blob);
56 layout->gpos_blob = Sanitizer<GPOS>::sanitize (hb_face_get_table (face, HB_OT_TAG_GPOS));
57 layout->gpos = Sanitizer<GPOS>::lock_instance (layout->gpos_blob);
63 _hb_ot_layout_free (hb_ot_layout_t *layout)
65 hb_blob_unlock (layout->gdef_blob);
66 hb_blob_unlock (layout->gsub_blob);
67 hb_blob_unlock (layout->gpos_blob);
69 hb_blob_destroy (layout->gdef_blob);
70 hb_blob_destroy (layout->gsub_blob);
71 hb_blob_destroy (layout->gpos_blob);
77 _get_gdef (hb_face_t *face)
79 return likely (face->ot_layout && face->ot_layout->gdef) ? *face->ot_layout->gdef : Null(GDEF);
83 _get_gsub (hb_face_t *face)
85 return likely (face->ot_layout && face->ot_layout->gsub) ? *face->ot_layout->gsub : Null(GSUB);
89 _get_gpos (hb_face_t *face)
91 return likely (face->ot_layout && face->ot_layout->gpos) ? *face->ot_layout->gpos : Null(GPOS);
100 hb_ot_layout_has_glyph_classes (hb_face_t *face)
102 return _get_gdef (face).has_glyph_classes ();
106 _hb_ot_layout_get_glyph_property_from_gdef (hb_face_t *face,
107 hb_glyph_info_t *info)
109 hb_codepoint_t glyph = info->codepoint;
112 const GDEF &gdef = _get_gdef (face);
114 klass = gdef.get_glyph_class (glyph);
118 case GDEF::UnclassifiedGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_UNCLASSIFIED;
119 case GDEF::BaseGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH;
120 case GDEF::LigatureGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE;
121 case GDEF::ComponentGlyph: return HB_OT_LAYOUT_GLYPH_CLASS_COMPONENT;
122 case GDEF::MarkGlyph:
123 klass = gdef.get_mark_attachment_type (glyph);
124 return HB_OT_LAYOUT_GLYPH_CLASS_MARK | (klass << 8);
128 static inline unsigned int
129 _hb_ot_layout_get_glyph_property (hb_face_t *face,
130 hb_glyph_info_t *info)
132 if (!info->gproperty())
133 info->gproperty() = _hb_ot_layout_get_glyph_property_from_gdef (face, info);
135 return info->gproperty();
139 _hb_ot_layout_check_glyph_property (hb_face_t *face,
140 hb_glyph_info_t *ginfo,
141 unsigned int lookup_props,
142 unsigned int *property_out)
144 unsigned int property;
146 property = _hb_ot_layout_get_glyph_property (face, ginfo);
148 *property_out = property;
150 /* Not covered, if, for example, glyph class is ligature and
151 * lookup_props includes LookupFlags::IgnoreLigatures
153 if (property & lookup_props & LookupFlag::IgnoreFlags)
156 if (property & HB_OT_LAYOUT_GLYPH_CLASS_MARK)
158 /* If using mark filtering sets, the high short of
159 * lookup_props has the set index.
161 if (lookup_props & LookupFlag::UseMarkFilteringSet)
162 return _get_gdef (face).mark_set_covers (lookup_props >> 16, ginfo->codepoint);
164 /* The second byte of lookup_props has the meaning
165 * "ignore marks of attachment type different than
166 * the attachment type specified."
168 if (lookup_props & LookupFlag::MarkAttachmentType && property & LookupFlag::MarkAttachmentType)
169 return (lookup_props & LookupFlag::MarkAttachmentType) == (property & LookupFlag::MarkAttachmentType);
176 _hb_ot_layout_skip_mark (hb_face_t *face,
177 hb_glyph_info_t *ginfo,
178 unsigned int lookup_props,
179 unsigned int *property_out)
181 unsigned int property;
183 property = _hb_ot_layout_get_glyph_property (face, ginfo);
185 *property_out = property;
187 /* If it's a mark, skip it we don't accept it. */
188 if (property & HB_OT_LAYOUT_GLYPH_CLASS_MARK)
189 return !_hb_ot_layout_check_glyph_property (face, ginfo, lookup_props, NULL);
191 /* If not a mark, don't skip. */
196 hb_ot_layout_get_attach_points (hb_face_t *face,
197 hb_codepoint_t glyph,
198 unsigned int start_offset,
199 unsigned int *point_count /* IN/OUT */,
200 unsigned int *point_array /* OUT */)
202 return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array);
206 hb_ot_layout_get_ligature_carets (hb_font_t *font,
208 hb_direction_t direction,
209 hb_codepoint_t glyph,
210 unsigned int start_offset,
211 unsigned int *caret_count /* IN/OUT */,
212 int *caret_array /* OUT */)
214 hb_ot_layout_context_t c;
217 return _get_gdef (face).get_lig_carets (&c, direction, glyph, start_offset, caret_count, caret_array);
224 static const GSUBGPOS&
225 get_gsubgpos_table (hb_face_t *face,
229 case HB_OT_TAG_GSUB: return _get_gsub (face);
230 case HB_OT_TAG_GPOS: return _get_gpos (face);
231 default: return Null(GSUBGPOS);
237 hb_ot_layout_table_get_script_tags (hb_face_t *face,
239 unsigned int start_offset,
240 unsigned int *script_count /* IN/OUT */,
241 hb_tag_t *script_tags /* OUT */)
243 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
245 return g.get_script_tags (start_offset, script_count, script_tags);
249 hb_ot_layout_table_find_script (hb_face_t *face,
252 unsigned int *script_index)
254 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
255 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
257 if (g.find_script_index (script_tag, script_index))
260 /* try finding 'DFLT' */
261 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
264 /* try with 'dflt'; MS site has had typos and many fonts use it now :(.
265 * including many versions of DejaVu Sans Mono! */
266 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
269 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
274 hb_ot_layout_table_choose_script (hb_face_t *face,
276 const hb_tag_t *script_tags,
277 unsigned int *script_index)
279 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
280 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
284 if (g.find_script_index (*script_tags, script_index))
289 /* try finding 'DFLT' */
290 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
293 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
294 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
297 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
302 hb_ot_layout_table_get_feature_tags (hb_face_t *face,
304 unsigned int start_offset,
305 unsigned int *feature_count /* IN/OUT */,
306 hb_tag_t *feature_tags /* OUT */)
308 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
310 return g.get_feature_tags (start_offset, feature_count, feature_tags);
315 hb_ot_layout_script_get_language_tags (hb_face_t *face,
317 unsigned int script_index,
318 unsigned int start_offset,
319 unsigned int *language_count /* IN/OUT */,
320 hb_tag_t *language_tags /* OUT */)
322 const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
324 return s.get_lang_sys_tags (start_offset, language_count, language_tags);
328 hb_ot_layout_script_find_language (hb_face_t *face,
330 unsigned int script_index,
331 hb_tag_t language_tag,
332 unsigned int *language_index)
334 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
335 const Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
337 if (s.find_lang_sys_index (language_tag, language_index))
340 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
341 if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
344 if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
349 hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
351 unsigned int script_index,
352 unsigned int language_index,
353 unsigned int *feature_index)
355 const LangSys &l = get_gsubgpos_table (face, table_tag).get_script (script_index).get_lang_sys (language_index);
357 if (feature_index) *feature_index = l.get_required_feature_index ();
359 return l.has_required_feature ();
363 hb_ot_layout_language_get_feature_indexes (hb_face_t *face,
365 unsigned int script_index,
366 unsigned int language_index,
367 unsigned int start_offset,
368 unsigned int *feature_count /* IN/OUT */,
369 unsigned int *feature_indexes /* OUT */)
371 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
372 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
374 return l.get_feature_indexes (start_offset, feature_count, feature_indexes);
378 hb_ot_layout_language_get_feature_tags (hb_face_t *face,
380 unsigned int script_index,
381 unsigned int language_index,
382 unsigned int start_offset,
383 unsigned int *feature_count /* IN/OUT */,
384 hb_tag_t *feature_tags /* OUT */)
386 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
387 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
389 ASSERT_STATIC (sizeof (unsigned int) == sizeof (hb_tag_t));
390 unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags);
393 unsigned int count = *feature_count;
394 for (unsigned int i = 0; i < count; i++)
395 feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]);
403 hb_ot_layout_language_find_feature (hb_face_t *face,
405 unsigned int script_index,
406 unsigned int language_index,
407 hb_tag_t feature_tag,
408 unsigned int *feature_index)
410 ASSERT_STATIC (Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
411 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
412 const LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
414 unsigned int num_features = l.get_feature_count ();
415 for (unsigned int i = 0; i < num_features; i++) {
416 unsigned int f_index = l.get_feature_index (i);
418 if (feature_tag == g.get_feature_tag (f_index)) {
419 if (feature_index) *feature_index = f_index;
424 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
429 hb_ot_layout_feature_get_lookup_indexes (hb_face_t *face,
431 unsigned int feature_index,
432 unsigned int start_offset,
433 unsigned int *lookup_count /* IN/OUT */,
434 unsigned int *lookup_indexes /* OUT */)
436 const GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
437 const Feature &f = g.get_feature (feature_index);
439 return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
448 hb_ot_layout_has_substitution (hb_face_t *face)
450 return &_get_gsub (face) != &Null(GSUB);
454 hb_ot_layout_substitute_lookup (hb_face_t *face,
456 unsigned int lookup_index,
459 hb_ot_layout_context_t c;
462 return _get_gsub (face).substitute_lookup (&c, buffer, lookup_index, mask);
471 hb_ot_layout_has_positioning (hb_face_t *face)
473 return &_get_gpos (face) != &Null(GPOS);
477 hb_ot_layout_position_lookup (hb_font_t *font,
480 unsigned int lookup_index,
483 hb_ot_layout_context_t c;
486 return _get_gpos (face).position_lookup (&c, buffer, lookup_index, mask);
490 hb_ot_layout_position_finish (hb_font_t *font HB_UNUSED,
491 hb_face_t *face HB_UNUSED,
495 unsigned int len = hb_buffer_get_length (buffer);
496 hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer);
497 hb_direction_t direction = buffer->props.direction;
501 /* Handle cursive connections:
502 * First handle all chain-back connections, then handle all chain-forward connections. */
503 if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
505 for (j = 0; j < len; j++) {
506 if (pos[j].cursive_chain() < 0)
507 pos[j].y_offset += pos[j + pos[j].cursive_chain()].y_offset;
509 for (i = len; i > 0; i--) {
511 if (pos[j].cursive_chain() > 0)
512 pos[j].y_offset += pos[j + pos[j].cursive_chain()].y_offset;
517 for (j = 0; j < len; j++) {
518 if (pos[j].cursive_chain() < 0)
519 pos[j].x_offset += pos[j + pos[j].cursive_chain()].x_offset;
521 for (i = len; i > 0; i--) {
523 if (pos[j].cursive_chain() > 0)
524 pos[j].x_offset += pos[j + pos[j].cursive_chain()].x_offset;
529 /* Handle attachments */
530 for (i = 0; i < len; i++)
533 unsigned int back = i - pos[i].back();
534 pos[i].x_offset += pos[back].x_offset;
535 pos[i].y_offset += pos[back].y_offset;
537 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
538 for (j = back + 1; j < i + 1; j++) {
539 pos[i].x_offset += pos[j].x_advance;
540 pos[i].y_offset += pos[j].y_advance;
543 for (j = back; j < i; j++) {
544 pos[i].x_offset -= pos[j].x_advance;
545 pos[i].y_offset -= pos[j].y_advance;