/* * Copyright © 1998-2004 David Turner and Werner Lemberg * Copyright © 2006 Behdad Esfahbod * Copyright © 2007,2008,2009 Red Hat, Inc. * Copyright © 2012,2013 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Red Hat Author(s): Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #include "hb-open-type-private.hh" #include "hb-ot-layout-private.hh" #include "hb-ot-layout-gdef-table.hh" #include "hb-ot-layout-gsub-table.hh" #include "hb-ot-layout-gpos-table.hh" #include "hb-ot-layout-jstf-table.hh" #include "hb-ot-map-private.hh" #include #include HB_SHAPER_DATA_ENSURE_DECLARE(ot, face) hb_ot_layout_t * _hb_ot_layout_create (hb_face_t *face) { hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t)); if (unlikely (!layout)) return NULL; layout->gdef_blob = OT::Sanitizer::sanitize (face->reference_table (HB_OT_TAG_GDEF)); layout->gdef = OT::Sanitizer::lock_instance (layout->gdef_blob); layout->gsub_blob = OT::Sanitizer::sanitize (face->reference_table (HB_OT_TAG_GSUB)); layout->gsub = OT::Sanitizer::lock_instance (layout->gsub_blob); layout->gpos_blob = OT::Sanitizer::sanitize (face->reference_table (HB_OT_TAG_GPOS)); layout->gpos = OT::Sanitizer::lock_instance (layout->gpos_blob); layout->gsub_lookup_count = layout->gsub->get_lookup_count (); layout->gpos_lookup_count = layout->gpos->get_lookup_count (); layout->gsub_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gsub->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t)); layout->gpos_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gpos->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t)); if (unlikely ((layout->gsub_lookup_count && !layout->gsub_accels) || (layout->gpos_lookup_count && !layout->gpos_accels))) { _hb_ot_layout_destroy (layout); return NULL; } for (unsigned int i = 0; i < layout->gsub_lookup_count; i++) layout->gsub_accels[i].init (layout->gsub->get_lookup (i)); for (unsigned int i = 0; i < layout->gpos_lookup_count; i++) layout->gpos_accels[i].init (layout->gpos->get_lookup (i)); return layout; } void _hb_ot_layout_destroy (hb_ot_layout_t *layout) { for (unsigned int i = 0; i < layout->gsub_lookup_count; i++) layout->gsub_accels[i].fini (); for (unsigned int i = 0; i < layout->gpos_lookup_count; i++) layout->gpos_accels[i].fini (); free (layout->gsub_accels); free (layout->gpos_accels); hb_blob_destroy (layout->gdef_blob); hb_blob_destroy (layout->gsub_blob); hb_blob_destroy (layout->gpos_blob); free (layout); } static inline const OT::GDEF& _get_gdef (hb_face_t *face) { if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GDEF); return *hb_ot_layout_from_face (face)->gdef; } static inline const OT::GSUB& _get_gsub (hb_face_t *face) { if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GSUB); return *hb_ot_layout_from_face (face)->gsub; } static inline const OT::GPOS& _get_gpos (hb_face_t *face) { if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GPOS); return *hb_ot_layout_from_face (face)->gpos; } /* * GDEF */ hb_bool_t hb_ot_layout_has_glyph_classes (hb_face_t *face) { return _get_gdef (face).has_glyph_classes (); } /** * Since: 0.9.7 **/ hb_ot_layout_glyph_class_t hb_ot_layout_get_glyph_class (hb_face_t *face, hb_codepoint_t glyph) { return (hb_ot_layout_glyph_class_t) _get_gdef (face).get_glyph_class (glyph); } /** * Since: 0.9.7 **/ void hb_ot_layout_get_glyphs_in_class (hb_face_t *face, hb_ot_layout_glyph_class_t klass, hb_set_t *glyphs /* OUT */) { return _get_gdef (face).get_glyphs_in_class (klass, glyphs); } unsigned int hb_ot_layout_get_attach_points (hb_face_t *face, hb_codepoint_t glyph, unsigned int start_offset, unsigned int *point_count /* IN/OUT */, unsigned int *point_array /* OUT */) { return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array); } unsigned int hb_ot_layout_get_ligature_carets (hb_font_t *font, hb_direction_t direction, hb_codepoint_t glyph, unsigned int start_offset, unsigned int *caret_count /* IN/OUT */, int *caret_array /* OUT */) { return _get_gdef (font->face).get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array); } /* * GSUB/GPOS */ static const OT::GSUBGPOS& get_gsubgpos_table (hb_face_t *face, hb_tag_t table_tag) { switch (table_tag) { case HB_OT_TAG_GSUB: return _get_gsub (face); case HB_OT_TAG_GPOS: return _get_gpos (face); default: return OT::Null(OT::GSUBGPOS); } } unsigned int hb_ot_layout_table_get_script_tags (hb_face_t *face, hb_tag_t table_tag, unsigned int start_offset, unsigned int *script_count /* IN/OUT */, hb_tag_t *script_tags /* OUT */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); return g.get_script_tags (start_offset, script_count, script_tags); } #define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n') hb_bool_t hb_ot_layout_table_find_script (hb_face_t *face, hb_tag_t table_tag, hb_tag_t script_tag, unsigned int *script_index) { ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX); const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); if (g.find_script_index (script_tag, script_index)) return true; /* try finding 'DFLT' */ if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) return false; /* try with 'dflt'; MS site has had typos and many fonts use it now :(. * including many versions of DejaVu Sans Mono! */ if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) return false; /* try with 'latn'; some old fonts put their features there even though they're really trying to support Thai, for example :( */ if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) return false; if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX; return false; } hb_bool_t hb_ot_layout_table_choose_script (hb_face_t *face, hb_tag_t table_tag, const hb_tag_t *script_tags, unsigned int *script_index, hb_tag_t *chosen_script) { ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX); const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); while (*script_tags) { if (g.find_script_index (*script_tags, script_index)) { if (chosen_script) *chosen_script = *script_tags; return true; } script_tags++; } /* try finding 'DFLT' */ if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) { if (chosen_script) *chosen_script = HB_OT_TAG_DEFAULT_SCRIPT; return false; } /* try with 'dflt'; MS site has had typos and many fonts use it now :( */ if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) { if (chosen_script) *chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE; return false; } /* try with 'latn'; some old fonts put their features there even though they're really trying to support Thai, for example :( */ if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) { if (chosen_script) *chosen_script = HB_OT_TAG_LATIN_SCRIPT; return false; } if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX; if (chosen_script) *chosen_script = HB_OT_LAYOUT_NO_SCRIPT_INDEX; return false; } unsigned int hb_ot_layout_table_get_feature_tags (hb_face_t *face, hb_tag_t table_tag, unsigned int start_offset, unsigned int *feature_count /* IN/OUT */, hb_tag_t *feature_tags /* OUT */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); return g.get_feature_tags (start_offset, feature_count, feature_tags); } hb_bool_t hb_ot_layout_table_find_feature (hb_face_t *face, hb_tag_t table_tag, hb_tag_t feature_tag, unsigned int *feature_index) { ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX); const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); unsigned int num_features = g.get_feature_count (); for (unsigned int i = 0; i < num_features; i++) { if (feature_tag == g.get_feature_tag (i)) { if (feature_index) *feature_index = i; return true; } } if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX; return false; } unsigned int hb_ot_layout_script_get_language_tags (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, unsigned int start_offset, unsigned int *language_count /* IN/OUT */, hb_tag_t *language_tags /* OUT */) { const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index); return s.get_lang_sys_tags (start_offset, language_count, language_tags); } hb_bool_t hb_ot_layout_script_find_language (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, hb_tag_t language_tag, unsigned int *language_index) { ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX); const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index); if (s.find_lang_sys_index (language_tag, language_index)) return true; /* try with 'dflt'; MS site has had typos and many fonts use it now :( */ if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index)) return false; if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX; return false; } hb_bool_t hb_ot_layout_language_get_required_feature_index (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, unsigned int language_index, unsigned int *feature_index) { return hb_ot_layout_language_get_required_feature (face, table_tag, script_index, language_index, feature_index, NULL); } /** * Since: 0.9.30 **/ hb_bool_t hb_ot_layout_language_get_required_feature (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, unsigned int language_index, unsigned int *feature_index, hb_tag_t *feature_tag) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index); unsigned int index = l.get_required_feature_index (); if (feature_index) *feature_index = index; if (feature_tag) *feature_tag = g.get_feature_tag (index); return l.has_required_feature (); } unsigned int hb_ot_layout_language_get_feature_indexes (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, unsigned int language_index, unsigned int start_offset, unsigned int *feature_count /* IN/OUT */, unsigned int *feature_indexes /* OUT */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index); return l.get_feature_indexes (start_offset, feature_count, feature_indexes); } unsigned int hb_ot_layout_language_get_feature_tags (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, unsigned int language_index, unsigned int start_offset, unsigned int *feature_count /* IN/OUT */, hb_tag_t *feature_tags /* OUT */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index); ASSERT_STATIC (sizeof (unsigned int) == sizeof (hb_tag_t)); unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags); if (feature_tags) { unsigned int count = *feature_count; for (unsigned int i = 0; i < count; i++) feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]); } return ret; } hb_bool_t hb_ot_layout_language_find_feature (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, unsigned int language_index, hb_tag_t feature_tag, unsigned int *feature_index) { ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX); const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index); unsigned int num_features = l.get_feature_count (); for (unsigned int i = 0; i < num_features; i++) { unsigned int f_index = l.get_feature_index (i); if (feature_tag == g.get_feature_tag (f_index)) { if (feature_index) *feature_index = f_index; return true; } } if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX; return false; } /** * Since: 0.9.7 **/ unsigned int hb_ot_layout_feature_get_lookups (hb_face_t *face, hb_tag_t table_tag, unsigned int feature_index, unsigned int start_offset, unsigned int *lookup_count /* IN/OUT */, unsigned int *lookup_indexes /* OUT */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); const OT::Feature &f = g.get_feature (feature_index); return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes); } /** * Since: 0.9.22 **/ unsigned int hb_ot_layout_table_get_lookup_count (hb_face_t *face, hb_tag_t table_tag) { switch (table_tag) { case HB_OT_TAG_GSUB: { return hb_ot_layout_from_face (face)->gsub_lookup_count; } case HB_OT_TAG_GPOS: { return hb_ot_layout_from_face (face)->gpos_lookup_count; } } return 0; } static void _hb_ot_layout_collect_lookups_lookups (hb_face_t *face, hb_tag_t table_tag, unsigned int feature_index, hb_set_t *lookup_indexes /* OUT */) { unsigned int lookup_indices[32]; unsigned int offset, len; offset = 0; do { len = ARRAY_LENGTH (lookup_indices); hb_ot_layout_feature_get_lookups (face, table_tag, feature_index, offset, &len, lookup_indices); for (unsigned int i = 0; i < len; i++) lookup_indexes->add (lookup_indices[i]); offset += len; } while (len == ARRAY_LENGTH (lookup_indices)); } static void _hb_ot_layout_collect_lookups_features (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, unsigned int language_index, const hb_tag_t *features, hb_set_t *lookup_indexes /* OUT */) { if (!features) { unsigned int required_feature_index; if (hb_ot_layout_language_get_required_feature (face, table_tag, script_index, language_index, &required_feature_index, NULL)) _hb_ot_layout_collect_lookups_lookups (face, table_tag, required_feature_index, lookup_indexes); /* All features */ unsigned int feature_indices[32]; unsigned int offset, len; offset = 0; do { len = ARRAY_LENGTH (feature_indices); hb_ot_layout_language_get_feature_indexes (face, table_tag, script_index, language_index, offset, &len, feature_indices); for (unsigned int i = 0; i < len; i++) _hb_ot_layout_collect_lookups_lookups (face, table_tag, feature_indices[i], lookup_indexes); offset += len; } while (len == ARRAY_LENGTH (feature_indices)); } else { for (; *features; features++) { unsigned int feature_index; if (hb_ot_layout_language_find_feature (face, table_tag, script_index, language_index, *features, &feature_index)) _hb_ot_layout_collect_lookups_lookups (face, table_tag, feature_index, lookup_indexes); } } } static void _hb_ot_layout_collect_lookups_languages (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, const hb_tag_t *languages, const hb_tag_t *features, hb_set_t *lookup_indexes /* OUT */) { _hb_ot_layout_collect_lookups_features (face, table_tag, script_index, HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX, features, lookup_indexes); if (!languages) { /* All languages */ unsigned int count = hb_ot_layout_script_get_language_tags (face, table_tag, script_index, 0, NULL, NULL); for (unsigned int language_index = 0; language_index < count; language_index++) _hb_ot_layout_collect_lookups_features (face, table_tag, script_index, language_index, features, lookup_indexes); } else { for (; *languages; languages++) { unsigned int language_index; if (hb_ot_layout_script_find_language (face, table_tag, script_index, *languages, &language_index)) _hb_ot_layout_collect_lookups_features (face, table_tag, script_index, language_index, features, lookup_indexes); } } } /** * Since: 0.9.8 **/ void hb_ot_layout_collect_lookups (hb_face_t *face, hb_tag_t table_tag, const hb_tag_t *scripts, const hb_tag_t *languages, const hb_tag_t *features, hb_set_t *lookup_indexes /* OUT */) { if (!scripts) { /* All scripts */ unsigned int count = hb_ot_layout_table_get_script_tags (face, table_tag, 0, NULL, NULL); for (unsigned int script_index = 0; script_index < count; script_index++) _hb_ot_layout_collect_lookups_languages (face, table_tag, script_index, languages, features, lookup_indexes); } else { for (; *scripts; scripts++) { unsigned int script_index; if (hb_ot_layout_table_find_script (face, table_tag, *scripts, &script_index)) _hb_ot_layout_collect_lookups_languages (face, table_tag, script_index, languages, features, lookup_indexes); } } } /** * Since: 0.9.7 **/ void hb_ot_layout_lookup_collect_glyphs (hb_face_t *face, hb_tag_t table_tag, unsigned int lookup_index, hb_set_t *glyphs_before, /* OUT. May be NULL */ hb_set_t *glyphs_input, /* OUT. May be NULL */ hb_set_t *glyphs_after, /* OUT. May be NULL */ hb_set_t *glyphs_output /* OUT. May be NULL */) { if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return; OT::hb_collect_glyphs_context_t c (face, glyphs_before, glyphs_input, glyphs_after, glyphs_output); switch (table_tag) { case HB_OT_TAG_GSUB: { const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index); l.collect_glyphs (&c); return; } case HB_OT_TAG_GPOS: { const OT::PosLookup& l = hb_ot_layout_from_face (face)->gpos->get_lookup (lookup_index); l.collect_glyphs (&c); return; } } } /* * OT::GSUB */ hb_bool_t hb_ot_layout_has_substitution (hb_face_t *face) { return &_get_gsub (face) != &OT::Null(OT::GSUB); } /** * Since: 0.9.7 **/ hb_bool_t hb_ot_layout_lookup_would_substitute (hb_face_t *face, unsigned int lookup_index, const hb_codepoint_t *glyphs, unsigned int glyphs_length, hb_bool_t zero_context) { if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return false; return hb_ot_layout_lookup_would_substitute_fast (face, lookup_index, glyphs, glyphs_length, zero_context); } hb_bool_t hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face, unsigned int lookup_index, const hb_codepoint_t *glyphs, unsigned int glyphs_length, hb_bool_t zero_context) { if (unlikely (lookup_index >= hb_ot_layout_from_face (face)->gsub_lookup_count)) return false; OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, zero_context); const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index); return l.would_apply (&c, &hb_ot_layout_from_face (face)->gsub_accels[lookup_index]); } void hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer) { OT::GSUB::substitute_start (font, buffer); } void hb_ot_layout_substitute_finish (hb_font_t *font, hb_buffer_t *buffer) { OT::GSUB::substitute_finish (font, buffer); } /** * Since: 0.9.7 **/ void hb_ot_layout_lookup_substitute_closure (hb_face_t *face, unsigned int lookup_index, hb_set_t *glyphs) { OT::hb_closure_context_t c (face, glyphs); const OT::SubstLookup& l = _get_gsub (face).get_lookup (lookup_index); l.closure (&c); } /* * OT::GPOS */ hb_bool_t hb_ot_layout_has_positioning (hb_face_t *face) { return &_get_gpos (face) != &OT::Null(OT::GPOS); } void hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer) { OT::GPOS::position_start (font, buffer); } void hb_ot_layout_position_finish (hb_font_t *font, hb_buffer_t *buffer) { OT::GPOS::position_finish (font, buffer); } /** * Since: 0.9.10 **/ hb_bool_t hb_ot_layout_get_size_params (hb_face_t *face, unsigned int *design_size, /* OUT. May be NULL */ unsigned int *subfamily_id, /* OUT. May be NULL */ unsigned int *subfamily_name_id, /* OUT. May be NULL */ unsigned int *range_start, /* OUT. May be NULL */ unsigned int *range_end /* OUT. May be NULL */) { const OT::GPOS &gpos = _get_gpos (face); const hb_tag_t tag = HB_TAG ('s','i','z','e'); unsigned int num_features = gpos.get_feature_count (); for (unsigned int i = 0; i < num_features; i++) { if (tag == gpos.get_feature_tag (i)) { const OT::Feature &f = gpos.get_feature (i); const OT::FeatureParamsSize ¶ms = f.get_feature_params ().get_size_params (tag); if (params.designSize) { #define PARAM(a, A) if (a) *a = params.A PARAM (design_size, designSize); PARAM (subfamily_id, subfamilyID); PARAM (subfamily_name_id, subfamilyNameID); PARAM (range_start, rangeStart); PARAM (range_end, rangeEnd); #undef PARAM return true; } } } #define PARAM(a, A) if (a) *a = 0 PARAM (design_size, designSize); PARAM (subfamily_id, subfamilyID); PARAM (subfamily_name_id, subfamilyNameID); PARAM (range_start, rangeStart); PARAM (range_end, rangeEnd); #undef PARAM return false; } /* * Parts of different types are implemented here such that they have direct * access to GSUB/GPOS lookups. */ struct GSUBProxy { static const unsigned int table_index = 0; static const bool inplace = false; typedef OT::SubstLookup Lookup; GSUBProxy (hb_face_t *face) : table (*hb_ot_layout_from_face (face)->gsub), accels (hb_ot_layout_from_face (face)->gsub_accels) {} const OT::GSUB &table; const hb_ot_layout_lookup_accelerator_t *accels; }; struct GPOSProxy { static const unsigned int table_index = 1; static const bool inplace = true; typedef OT::PosLookup Lookup; GPOSProxy (hb_face_t *face) : table (*hb_ot_layout_from_face (face)->gpos), accels (hb_ot_layout_from_face (face)->gpos_accels) {} const OT::GPOS &table; const hb_ot_layout_lookup_accelerator_t *accels; }; template static inline bool apply_forward (OT::hb_apply_context_t *c, const Obj &obj, const hb_ot_layout_lookup_accelerator_t &accel) { bool ret = false; hb_buffer_t *buffer = c->buffer; while (buffer->idx < buffer->len) { if (accel.may_have (buffer->cur().codepoint) && (buffer->cur().mask & c->lookup_mask) && c->check_glyph_property (&buffer->cur(), c->lookup_props) && obj.apply (c)) ret = true; else buffer->next_glyph (); } return ret; } template static inline bool apply_backward (OT::hb_apply_context_t *c, const Obj &obj, const hb_ot_layout_lookup_accelerator_t &accel) { bool ret = false; hb_buffer_t *buffer = c->buffer; do { if (accel.may_have (buffer->cur().codepoint) && (buffer->cur().mask & c->lookup_mask) && c->check_glyph_property (&buffer->cur(), c->lookup_props) && obj.apply (c)) ret = true; /* The reverse lookup doesn't "advance" cursor (for good reason). */ buffer->idx--; } while ((int) buffer->idx >= 0); return ret; } struct hb_apply_forward_context_t : OT::hb_dispatch_context_t { inline const char *get_name (void) { return "APPLY_FWD"; } template inline return_t dispatch (const T &obj) { return apply_forward (c, obj, accel); } static return_t default_return_value (void) { return false; } bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return true; } hb_apply_forward_context_t (OT::hb_apply_context_t *c_, const hb_ot_layout_lookup_accelerator_t &accel_) : c (c_), accel (accel_), debug_depth (0) {} OT::hb_apply_context_t *c; const hb_ot_layout_lookup_accelerator_t &accel; unsigned int debug_depth; }; template static inline void apply_string (OT::hb_apply_context_t *c, const typename Proxy::Lookup &lookup, const hb_ot_layout_lookup_accelerator_t &accel) { hb_buffer_t *buffer = c->buffer; if (unlikely (!buffer->len || !c->lookup_mask)) return; c->set_lookup_props (lookup.get_props ()); if (likely (!lookup.is_reverse ())) { /* in/out forward substitution/positioning */ if (Proxy::table_index == 0) buffer->clear_output (); buffer->idx = 0; bool ret; if (lookup.get_subtable_count () == 1) { hb_apply_forward_context_t c_forward (c, accel); ret = lookup.dispatch (&c_forward); } else ret = apply_forward (c, lookup, accel); if (ret) { if (!Proxy::inplace) buffer->swap_buffers (); else assert (!buffer->has_separate_output ()); } } else { /* in-place backward substitution/positioning */ if (Proxy::table_index == 0) buffer->remove_output (); buffer->idx = buffer->len - 1; apply_backward (c, lookup, accel); } } template inline void hb_ot_map_t::apply (const Proxy &proxy, const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const { const unsigned int table_index = proxy.table_index; unsigned int i = 0; OT::hb_apply_context_t c (table_index, font, buffer); c.set_recurse_func (Proxy::Lookup::apply_recurse_func); for (unsigned int stage_index = 0; stage_index < stages[table_index].len; stage_index++) { const stage_map_t *stage = &stages[table_index][stage_index]; for (; i < stage->last_lookup; i++) { #if 0 char buf[4096]; hb_buffer_serialize_glyphs (buffer, 0, buffer->len, buf, sizeof (buf), NULL, font, HB_BUFFER_SERIALIZE_FORMAT_TEXT, Proxy::table_index == 0 ? HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS : HB_BUFFER_SERIALIZE_FLAG_DEFAULT); printf ("buf: [%s]\n", buf); #endif unsigned int lookup_index = lookups[table_index][i].index; c.set_lookup_index (lookup_index); c.set_lookup_mask (lookups[table_index][i].mask); c.set_auto_zwj (lookups[table_index][i].auto_zwj); apply_string (&c, proxy.table.get_lookup (lookup_index), proxy.accels[lookup_index]); } if (stage->pause_func) { buffer->clear_output (); stage->pause_func (plan, font, buffer); } } } void hb_ot_map_t::substitute (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const { GSUBProxy proxy (font->face); apply (proxy, plan, font, buffer); } void hb_ot_map_t::position (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const { GPOSProxy proxy (font->face); apply (proxy, plan, font, buffer); } HB_INTERNAL void hb_ot_layout_substitute_lookup (OT::hb_apply_context_t *c, const OT::SubstLookup &lookup, const hb_ot_layout_lookup_accelerator_t &accel) { apply_string (c, lookup, accel); }