diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-ot-layout.cc')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-ot-layout.cc | 235 |
1 files changed, 152 insertions, 83 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-layout.cc b/thirdparty/harfbuzz/src/hb-ot-layout.cc index f9c0daa486..e8091ec3e0 100644 --- a/thirdparty/harfbuzz/src/hb-ot-layout.cc +++ b/thirdparty/harfbuzz/src/hb-ot-layout.cc @@ -601,9 +601,13 @@ hb_ot_layout_table_select_script (hb_face_t *face, * @feature_tags: (out) (array length=feature_count): Array of feature tags found in the table * * Fetches a list of all feature tags in the given face's GSUB or GPOS table. + * Note that there might be duplicate feature tags, belonging to different + * script/language-system pairs of the table. * * Return value: Total number of feature tags. * + * Since: 0.6.0 + * **/ unsigned int hb_ot_layout_table_get_feature_tags (hb_face_t *face, @@ -629,6 +633,9 @@ hb_ot_layout_table_get_feature_tags (hb_face_t *face, * or GPOS table. * * Return value: `true` if the feature is found, `false` otherwise + * + * Since: 0.6.0 + * **/ bool hb_ot_layout_table_find_feature (hb_face_t *face, @@ -668,6 +675,8 @@ hb_ot_layout_table_find_feature (hb_face_t *face, * * Return value: Total number of language tags. * + * Since: 0.6.0 + * **/ unsigned int hb_ot_layout_script_get_language_tags (hb_face_t *face, @@ -778,6 +787,8 @@ hb_ot_layout_script_select_language (hb_face_t *face, * * Return value: `true` if the feature is found, `false` otherwise * + * Since: 0.6.0 + * **/ hb_bool_t hb_ot_layout_language_get_required_feature_index (hb_face_t *face, @@ -846,6 +857,9 @@ hb_ot_layout_language_get_required_feature (hb_face_t *face, * returned will begin at the offset provided. * * Return value: Total number of features. + * + * Since: 0.6.0 + * **/ unsigned int hb_ot_layout_language_get_feature_indexes (hb_face_t *face, @@ -879,6 +893,9 @@ hb_ot_layout_language_get_feature_indexes (hb_face_t *face, * returned will begin at the offset provided. * * Return value: Total number of feature tags. + * + * Since: 0.6.0 + * **/ unsigned int hb_ot_layout_language_get_feature_tags (hb_face_t *face, @@ -919,6 +936,8 @@ hb_ot_layout_language_get_feature_tags (hb_face_t *face, * * Return value: `true` if the feature is found, `false` otherwise * + * Since: 0.6.0 + * **/ hb_bool_t hb_ot_layout_language_find_feature (hb_face_t *face, @@ -1167,9 +1186,12 @@ script_collect_features (hb_collect_features_context_t *c, * hb_ot_layout_collect_features: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS - * @scripts: The array of scripts to collect features for - * @languages: The array of languages to collect features for - * @features: The array of features to collect + * @scripts: (nullable) (array zero-terminated=1): The array of scripts to collect features for, + * terminated by %HB_TAG_NONE + * @languages: (nullable) (array zero-terminated=1): The array of languages to collect features for, + * terminated by %HB_TAG_NONE + * @features: (nullable) (array zero-terminated=1): The array of features to collect, + * terminated by %HB_TAG_NONE * @feature_indexes: (out): The array of feature indexes found for the query * * Fetches a list of all feature indexes in the specified face's GSUB table @@ -1216,9 +1238,12 @@ hb_ot_layout_collect_features (hb_face_t *face, * hb_ot_layout_collect_lookups: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS - * @scripts: The array of scripts to collect lookups for - * @languages: The array of languages to collect lookups for - * @features: The array of features to collect lookups for + * @scripts: (nullable) (array zero-terminated=1): The array of scripts to collect lookups for, + * terminated by %HB_TAG_NONE + * @languages: (nullable) (array zero-terminated=1): The array of languages to collect lookups for, + * terminated by %HB_TAG_NONE + * @features: (nullable) (array zero-terminated=1): The array of features to collect lookups for, + * terminated by %HB_TAG_NONE * @lookup_indexes: (out): The array of lookup indexes found for the query * * Fetches a list of all feature-lookup indexes in the specified face's GSUB @@ -1246,7 +1271,7 @@ hb_ot_layout_collect_lookups (hb_face_t *face, hb_set_next (&feature_indexes, &feature_index);) g.get_feature (feature_index).add_lookup_indexes_to (lookup_indexes); - g.feature_variation_collect_lookups (&feature_indexes, lookup_indexes); + g.feature_variation_collect_lookups (&feature_indexes, nullptr, lookup_indexes); } @@ -1316,6 +1341,8 @@ hb_ot_layout_lookup_collect_glyphs (hb_face_t *face, * * Return value: `true` if feature variations were found, `false` otherwise. * + * Since: 1.4.0 + * **/ hb_bool_t hb_ot_layout_table_find_feature_variations (hb_face_t *face, @@ -1347,6 +1374,8 @@ hb_ot_layout_table_find_feature_variations (hb_face_t *face, * * Return value: Total number of lookups. * + * Since: 1.4.0 + * **/ unsigned int hb_ot_layout_feature_with_variations_get_lookups (hb_face_t *face, @@ -1379,6 +1408,8 @@ hb_ot_layout_feature_with_variations_get_lookups (hb_face_t *face, * * Return value: `true` if data found, `false` otherwise * + * Since: 0.6.0 + * **/ hb_bool_t hb_ot_layout_has_substitution (hb_face_t *face) @@ -1434,56 +1465,6 @@ hb_ot_layout_substitute_start (hb_font_t *font, _hb_ot_layout_set_glyph_props (font, buffer); } -void -hb_ot_layout_delete_glyphs_inplace (hb_buffer_t *buffer, - bool (*filter) (const hb_glyph_info_t *info)) -{ - /* Merge clusters and delete filtered glyphs. - * NOTE! We can't use out-buffer as we have positioning data. */ - unsigned int j = 0; - unsigned int count = buffer->len; - hb_glyph_info_t *info = buffer->info; - hb_glyph_position_t *pos = buffer->pos; - for (unsigned int i = 0; i < count; i++) - { - if (filter (&info[i])) - { - /* Merge clusters. - * Same logic as buffer->delete_glyph(), but for in-place removal. */ - - unsigned int cluster = info[i].cluster; - if (i + 1 < count && cluster == info[i + 1].cluster) - continue; /* Cluster survives; do nothing. */ - - if (j) - { - /* Merge cluster backward. */ - if (cluster < info[j - 1].cluster) - { - unsigned int mask = info[i].mask; - unsigned int old_cluster = info[j - 1].cluster; - for (unsigned k = j; k && info[k - 1].cluster == old_cluster; k--) - buffer->set_cluster (info[k - 1], cluster, mask); - } - continue; - } - - if (i + 1 < count) - buffer->merge_clusters (i, i + 2); /* Merge cluster forward. */ - - continue; - } - - if (j != i) - { - info[j] = info[i]; - pos[j] = pos[i]; - } - j++; - } - buffer->len = j; -} - /** * hb_ot_layout_lookup_substitute_closure: * @face: #hb_face_t to work upon @@ -1678,6 +1659,8 @@ hb_ot_layout_get_size_params (hb_face_t *face, return false; } + + /** * hb_ot_layout_feature_get_name_ids: * @face: #hb_face_t to work upon @@ -1834,7 +1817,7 @@ apply_forward (OT::hb_ot_apply_context_t *c, while (buffer->idx < buffer->len && buffer->successful) { bool applied = false; - if (accel.may_have (buffer->cur().codepoint) && + if (accel.digest.may_have (buffer->cur().codepoint) && (buffer->cur().mask & c->lookup_mask) && c->check_glyph_property (&buffer->cur(), c->lookup_props)) { @@ -1861,7 +1844,7 @@ apply_backward (OT::hb_ot_apply_context_t *c, hb_buffer_t *buffer = c->buffer; do { - if (accel.may_have (buffer->cur().codepoint) && + if (accel.digest.may_have (buffer->cur().codepoint) && (buffer->cur().mask & c->lookup_mask) && c->check_glyph_property (&buffer->cur(), c->lookup_props)) ret |= accel.apply (c, false); @@ -1875,15 +1858,16 @@ apply_backward (OT::hb_ot_apply_context_t *c, } template <typename Proxy> -static inline void +static inline bool apply_string (OT::hb_ot_apply_context_t *c, const typename Proxy::Lookup &lookup, const OT::hb_ot_layout_lookup_accelerator_t &accel) { + bool ret = false; hb_buffer_t *buffer = c->buffer; if (unlikely (!buffer->len || !c->lookup_mask)) - return; + return ret; c->set_lookup_props (lookup.get_props ()); @@ -1894,7 +1878,7 @@ apply_string (OT::hb_ot_apply_context_t *c, buffer->clear_output (); buffer->idx = 0; - apply_forward (c, accel); + ret = apply_forward (c, accel); if (!Proxy::always_inplace) buffer->sync (); @@ -1904,8 +1888,10 @@ apply_string (OT::hb_ot_apply_context_t *c, /* in-place backward substitution/positioning */ assert (!buffer->have_output); buffer->idx = buffer->len - 1; - apply_backward (c, accel); + ret = apply_backward (c, accel); } + + return ret; } template <typename Proxy> @@ -1924,23 +1910,42 @@ inline void hb_ot_map_t::apply (const Proxy &proxy, const stage_map_t *stage = &stages[table_index][stage_index]; for (; i < stage->last_lookup; i++) { - unsigned int lookup_index = lookups[table_index][i].index; - if (!buffer->message (font, "start lookup %d", lookup_index)) continue; - 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); - c.set_auto_zwnj (lookups[table_index][i].auto_zwnj); - c.set_random (lookups[table_index][i].random); - c.set_per_syllable (lookups[table_index][i].per_syllable); - - apply_string<Proxy> (&c, - proxy.table.get_lookup (lookup_index), - proxy.accels[lookup_index]); - (void) buffer->message (font, "end lookup %d", lookup_index); + auto &lookup = lookups[table_index][i]; + + unsigned int lookup_index = lookup.index; + if (!buffer->message (font, "start lookup %d feature '%c%c%c%c'", lookup_index, HB_UNTAG (lookup.feature_tag))) continue; + + /* c.digest is a digest of all the current glyphs in the buffer + * (plus some past glyphs). + * + * Only try applying the lookup if there is any overlap. */ + if (proxy.accels[lookup_index].digest.may_have (c.digest)) + { + c.set_lookup_index (lookup_index); + c.set_lookup_mask (lookup.mask); + c.set_auto_zwj (lookup.auto_zwj); + c.set_auto_zwnj (lookup.auto_zwnj); + c.set_random (lookup.random); + c.set_per_syllable (lookup.per_syllable); + + apply_string<Proxy> (&c, + proxy.table.get_lookup (lookup_index), + proxy.accels[lookup_index]); + } + else + (void) buffer->message (font, "skipped lookup %d feature '%c%c%c%c' because no glyph matches", lookup_index, HB_UNTAG (lookup.feature_tag)); + + (void) buffer->message (font, "end lookup %d feature '%c%c%c%c'", lookup_index, HB_UNTAG (lookup.feature_tag)); } if (stage->pause_func) - stage->pause_func (plan, font, buffer); + { + if (stage->pause_func (plan, font, buffer)) + { + /* Refresh working buffer digest since buffer changed. */ + c.digest = buffer->digest (); + } + } } } @@ -2297,11 +2302,6 @@ struct hb_get_glyph_alternates_dispatch_t : static return_t default_return_value () { return 0; } bool stop_sublookup_iteration (return_t r) const { return r; } - hb_face_t *face; - - hb_get_glyph_alternates_dispatch_t (hb_face_t *face) : - face (face) {} - private: template <typename T, typename ...Ts> auto _dispatch (const T &obj, hb_priority<1>, Ts&&... ds) HB_AUTO_RETURN @@ -2315,6 +2315,7 @@ struct hb_get_glyph_alternates_dispatch_t : ( _dispatch (obj, hb_prioritize, std::forward<Ts> (ds)...) ) }; +#ifndef HB_NO_LAYOUT_RARELY_USED /** * hb_ot_layout_lookup_get_glyph_alternates: * @face: a face. @@ -2340,11 +2341,79 @@ hb_ot_layout_lookup_get_glyph_alternates (hb_face_t *face, unsigned *alternate_count /* IN/OUT. May be NULL. */, hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */) { - hb_get_glyph_alternates_dispatch_t c (face); + hb_get_glyph_alternates_dispatch_t c; const OT::SubstLookup &lookup = face->table.GSUB->table->get_lookup (lookup_index); auto ret = lookup.dispatch (&c, glyph, start_offset, alternate_count, alternate_glyphs); if (!ret && alternate_count) *alternate_count = 0; return ret; } + +struct hb_position_single_dispatch_t : + hb_dispatch_context_t<hb_position_single_dispatch_t, bool> +{ + static return_t default_return_value () { return false; } + bool stop_sublookup_iteration (return_t r) const { return r; } + + private: + template <typename T, typename ...Ts> auto + _dispatch (const T &obj, hb_priority<1>, Ts&&... ds) HB_AUTO_RETURN + ( obj.position_single (std::forward<Ts> (ds)...) ) + template <typename T, typename ...Ts> auto + _dispatch (const T &obj, hb_priority<0>, Ts&&... ds) HB_AUTO_RETURN + ( default_return_value () ) + public: + template <typename T, typename ...Ts> auto + dispatch (const T &obj, Ts&&... ds) HB_AUTO_RETURN + ( _dispatch (obj, hb_prioritize, std::forward<Ts> (ds)...) ) +}; + +/** + * hb_ot_layout_lookup_get_optical_bound: + * @font: a font. + * @lookup_index: index of the feature lookup to query. + * @direction: edge of the glyph to query. + * @glyph: a glyph id. + * + * Fetches the optical bound of a glyph positioned at the margin of text. + * The direction identifies which edge of the glyph to query. + * + * Return value: Adjustment value. Negative values mean the glyph will stick out of the margin. + * + * Since: 5.3.0 + **/ +hb_position_t +hb_ot_layout_lookup_get_optical_bound (hb_font_t *font, + unsigned lookup_index, + hb_direction_t direction, + hb_codepoint_t glyph) +{ + const OT::PosLookup &lookup = font->face->table.GPOS->table->get_lookup (lookup_index); + hb_glyph_position_t pos = {0}; + hb_position_single_dispatch_t c; + lookup.dispatch (&c, font, direction, glyph, pos); + hb_position_t ret = 0; + switch (direction) + { + case HB_DIRECTION_LTR: + ret = pos.x_offset; + break; + case HB_DIRECTION_RTL: + ret = pos.x_advance - pos.x_offset; + break; + case HB_DIRECTION_TTB: + ret = pos.y_offset; + break; + case HB_DIRECTION_BTT: + ret = pos.y_advance - pos.y_offset; + break; + case HB_DIRECTION_INVALID: + default: + break; + } + return ret; +} +#endif + + #endif |