/* * 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.hh" #ifndef HB_NO_OT_LAYOUT #ifdef HB_NO_OT_TAG #error "Cannot compile hb-ot-layout.cc with HB_NO_OT_TAG." #endif #include "hb-open-type.hh" #include "hb-ot-layout.hh" #include "hb-ot-face.hh" #include "hb-ot-map.hh" #include "hb-map.hh" #include "hb-ot-kern-table.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-base-table.hh" #include "hb-ot-layout-jstf-table.hh" // Just so we compile it; unused otherwise. #include "hb-ot-name-table.hh" #include "hb-ot-os2-table.hh" #include "hb-aat-layout-morx-table.hh" #include "hb-aat-layout-opbd-table.hh" // Just so we compile it; unused otherwise. using OT::Layout::GSUB; using OT::Layout::GPOS; /** * SECTION:hb-ot-layout * @title: hb-ot-layout * @short_description: OpenType Layout * @include: hb-ot.h * * Functions for querying OpenType Layout features in the font face. **/ /* * kern */ #ifndef HB_NO_OT_KERN /** * hb_ot_layout_has_kerning: * @face: The #hb_face_t to work on * * Tests whether a face includes any kerning data in the 'kern' table. * Does NOT test for kerning lookups in the GPOS table. * * Return value: `true` if data found, `false` otherwise * **/ bool hb_ot_layout_has_kerning (hb_face_t *face) { return face->table.kern->has_data (); } /** * hb_ot_layout_has_machine_kerning: * @face: The #hb_face_t to work on * * Tests whether a face includes any state-machine kerning in the 'kern' table. * Does NOT examine the GPOS table. * * Return value: `true` if data found, `false` otherwise * **/ bool hb_ot_layout_has_machine_kerning (hb_face_t *face) { return face->table.kern->has_state_machine (); } /** * hb_ot_layout_has_cross_kerning: * @face: The #hb_face_t to work on * * Tests whether a face has any cross-stream kerning (i.e., kerns * that make adjustments perpendicular to the direction of the text * flow: Y adjustments in horizontal text or X adjustments in * vertical text) in the 'kern' table. * * Does NOT examine the GPOS table. * * Return value: `true` is data found, `false` otherwise * **/ bool hb_ot_layout_has_cross_kerning (hb_face_t *face) { return face->table.kern->has_cross_stream (); } void hb_ot_layout_kern (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) { hb_blob_t *blob = font->face->table.kern.get_blob (); const AAT::kern& kern = *blob->as (); AAT::hb_aat_apply_context_t c (plan, font, buffer, blob); if (!buffer->message (font, "start table kern")) return; kern.apply (&c); (void) buffer->message (font, "end table kern"); } #endif /* * GDEF */ bool OT::GDEF::is_blocklisted (hb_blob_t *blob, hb_face_t *face) const { #ifdef HB_NO_OT_LAYOUT_BLOCKLIST return false; #endif /* The ugly business of blocklisting individual fonts' tables happen here! * See this thread for why we finally had to bend in and do this: * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html * * In certain versions of Times New Roman Italic and Bold Italic, * ASCII double quotation mark U+0022 has wrong glyph class 3 (mark) * in GDEF. Many versions of Tahoma have bad GDEF tables that * incorrectly classify some spacing marks such as certain IPA * symbols as glyph class 3. So do older versions of Microsoft * Himalaya, and the version of Cantarell shipped by Ubuntu 16.04. * * Nuke the GDEF tables of to avoid unwanted width-zeroing. * * See https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279693 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279875 */ switch HB_CODEPOINT_ENCODE3(blob->length, face->table.GSUB->table.get_length (), face->table.GPOS->table.get_length ()) { /* sha1sum:c5ee92f0bca4bfb7d06c4d03e8cf9f9cf75d2e8a Windows 7? timesi.ttf */ case HB_CODEPOINT_ENCODE3 (442, 2874, 42038): /* sha1sum:37fc8c16a0894ab7b749e35579856c73c840867b Windows 7? timesbi.ttf */ case HB_CODEPOINT_ENCODE3 (430, 2874, 40662): /* sha1sum:19fc45110ea6cd3cdd0a5faca256a3797a069a80 Windows 7 timesi.ttf */ case HB_CODEPOINT_ENCODE3 (442, 2874, 39116): /* sha1sum:6d2d3c9ed5b7de87bc84eae0df95ee5232ecde26 Windows 7 timesbi.ttf */ case HB_CODEPOINT_ENCODE3 (430, 2874, 39374): /* sha1sum:8583225a8b49667c077b3525333f84af08c6bcd8 OS X 10.11.3 Times New Roman Italic.ttf */ case HB_CODEPOINT_ENCODE3 (490, 3046, 41638): /* sha1sum:ec0f5a8751845355b7c3271d11f9918a966cb8c9 OS X 10.11.3 Times New Roman Bold Italic.ttf */ case HB_CODEPOINT_ENCODE3 (478, 3046, 41902): /* sha1sum:96eda93f7d33e79962451c6c39a6b51ee893ce8c tahoma.ttf from Windows 8 */ case HB_CODEPOINT_ENCODE3 (898, 12554, 46470): /* sha1sum:20928dc06014e0cd120b6fc942d0c3b1a46ac2bc tahomabd.ttf from Windows 8 */ case HB_CODEPOINT_ENCODE3 (910, 12566, 47732): /* sha1sum:4f95b7e4878f60fa3a39ca269618dfde9721a79e tahoma.ttf from Windows 8.1 */ case HB_CODEPOINT_ENCODE3 (928, 23298, 59332): /* sha1sum:6d400781948517c3c0441ba42acb309584b73033 tahomabd.ttf from Windows 8.1 */ case HB_CODEPOINT_ENCODE3 (940, 23310, 60732): /* tahoma.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ case HB_CODEPOINT_ENCODE3 (964, 23836, 60072): /* tahomabd.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ case HB_CODEPOINT_ENCODE3 (976, 23832, 61456): /* sha1sum:e55fa2dfe957a9f7ec26be516a0e30b0c925f846 tahoma.ttf from Windows 10 */ case HB_CODEPOINT_ENCODE3 (994, 24474, 60336): /* sha1sum:7199385abb4c2cc81c83a151a7599b6368e92343 tahomabd.ttf from Windows 10 */ case HB_CODEPOINT_ENCODE3 (1006, 24470, 61740): /* tahoma.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ case HB_CODEPOINT_ENCODE3 (1006, 24576, 61346): /* tahomabd.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ case HB_CODEPOINT_ENCODE3 (1018, 24572, 62828): /* sha1sum:b9c84d820c49850d3d27ec498be93955b82772b5 tahoma.ttf from Windows 10 AU */ case HB_CODEPOINT_ENCODE3 (1006, 24576, 61352): /* sha1sum:2bdfaab28174bdadd2f3d4200a30a7ae31db79d2 tahomabd.ttf from Windows 10 AU */ case HB_CODEPOINT_ENCODE3 (1018, 24572, 62834): /* sha1sum:b0d36cf5a2fbe746a3dd277bffc6756a820807a7 Tahoma.ttf from Mac OS X 10.9 */ case HB_CODEPOINT_ENCODE3 (832, 7324, 47162): /* sha1sum:12fc4538e84d461771b30c18b5eb6bd434e30fba Tahoma Bold.ttf from Mac OS X 10.9 */ case HB_CODEPOINT_ENCODE3 (844, 7302, 45474): /* sha1sum:eb8afadd28e9cf963e886b23a30b44ab4fd83acc himalaya.ttf from Windows 7 */ case HB_CODEPOINT_ENCODE3 (180, 13054, 7254): /* sha1sum:73da7f025b238a3f737aa1fde22577a6370f77b0 himalaya.ttf from Windows 8 */ case HB_CODEPOINT_ENCODE3 (192, 12638, 7254): /* sha1sum:6e80fd1c0b059bbee49272401583160dc1e6a427 himalaya.ttf from Windows 8.1 */ case HB_CODEPOINT_ENCODE3 (192, 12690, 7254): /* 8d9267aea9cd2c852ecfb9f12a6e834bfaeafe44 cantarell-fonts-0.0.21/otf/Cantarell-Regular.otf */ /* 983988ff7b47439ab79aeaf9a45bd4a2c5b9d371 cantarell-fonts-0.0.21/otf/Cantarell-Oblique.otf */ case HB_CODEPOINT_ENCODE3 (188, 248, 3852): /* 2c0c90c6f6087ffbfea76589c93113a9cbb0e75f cantarell-fonts-0.0.21/otf/Cantarell-Bold.otf */ /* 55461f5b853c6da88069ffcdf7f4dd3f8d7e3e6b cantarell-fonts-0.0.21/otf/Cantarell-Bold-Oblique.otf */ case HB_CODEPOINT_ENCODE3 (188, 264, 3426): /* d125afa82a77a6475ac0e74e7c207914af84b37a padauk-2.80/Padauk.ttf RHEL 7.2 */ case HB_CODEPOINT_ENCODE3 (1058, 47032, 11818): /* 0f7b80437227b90a577cc078c0216160ae61b031 padauk-2.80/Padauk-Bold.ttf RHEL 7.2*/ case HB_CODEPOINT_ENCODE3 (1046, 47030, 12600): /* d3dde9aa0a6b7f8f6a89ef1002e9aaa11b882290 padauk-2.80/Padauk.ttf Ubuntu 16.04 */ case HB_CODEPOINT_ENCODE3 (1058, 71796, 16770): /* 5f3c98ccccae8a953be2d122c1b3a77fd805093f padauk-2.80/Padauk-Bold.ttf Ubuntu 16.04 */ case HB_CODEPOINT_ENCODE3 (1046, 71790, 17862): /* 6c93b63b64e8b2c93f5e824e78caca555dc887c7 padauk-2.80/Padauk-book.ttf */ case HB_CODEPOINT_ENCODE3 (1046, 71788, 17112): /* d89b1664058359b8ec82e35d3531931125991fb9 padauk-2.80/Padauk-bookbold.ttf */ case HB_CODEPOINT_ENCODE3 (1058, 71794, 17514): /* 824cfd193aaf6234b2b4dc0cf3c6ef576c0d00ef padauk-3.0/Padauk-book.ttf */ case HB_CODEPOINT_ENCODE3 (1330, 109904, 57938): /* 91fcc10cf15e012d27571e075b3b4dfe31754a8a padauk-3.0/Padauk-bookbold.ttf */ case HB_CODEPOINT_ENCODE3 (1330, 109904, 58972): /* sha1sum: c26e41d567ed821bed997e937bc0c41435689e85 Padauk.ttf * "Padauk Regular" "Version 2.5", see https://crbug.com/681813 */ case HB_CODEPOINT_ENCODE3 (1004, 59092, 14836): return true; } return false; } static void _hb_ot_layout_set_glyph_props (hb_font_t *font, hb_buffer_t *buffer) { _hb_buffer_assert_gsubgpos_vars (buffer); const OT::GDEF &gdef = *font->face->table.GDEF->table; unsigned int count = buffer->len; for (unsigned int i = 0; i < count; i++) { _hb_glyph_info_set_glyph_props (&buffer->info[i], gdef.get_glyph_props (buffer->info[i].codepoint)); _hb_glyph_info_clear_lig_props (&buffer->info[i]); } } /* Public API */ /** * hb_ot_layout_has_glyph_classes: * @face: #hb_face_t to work upon * * Tests whether a face has any glyph classes defined in its GDEF table. * * Return value: `true` if data found, `false` otherwise * **/ hb_bool_t hb_ot_layout_has_glyph_classes (hb_face_t *face) { return face->table.GDEF->table->has_glyph_classes (); } /** * hb_ot_layout_get_glyph_class: * @face: The #hb_face_t to work on * @glyph: The #hb_codepoint_t code point to query * * Fetches the GDEF class of the requested glyph in the specified face. * * Return value: The #hb_ot_layout_glyph_class_t glyph class of the given code * point in the GDEF table of the face. * * 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) face->table.GDEF->table->get_glyph_class (glyph); } /** * hb_ot_layout_get_glyphs_in_class: * @face: The #hb_face_t to work on * @klass: The #hb_ot_layout_glyph_class_t GDEF class to retrieve * @glyphs: (out): The #hb_set_t set of all glyphs belonging to the requested * class. * * Retrieves the set of all glyphs from the face that belong to the requested * glyph class in the face's GDEF table. * * 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 face->table.GDEF->table->get_glyphs_in_class (klass, glyphs); } #ifndef HB_NO_LAYOUT_UNUSED /** * hb_ot_layout_get_attach_points: * @face: The #hb_face_t to work on * @glyph: The #hb_codepoint_t code point to query * @start_offset: offset of the first attachment point to retrieve * @point_count: (inout) (optional): Input = the maximum number of attachment points to return; * Output = the actual number of attachment points returned (may be zero) * @point_array: (out) (array length=point_count): The array of attachment points found for the query * * Fetches a list of all attachment points for the specified glyph in the GDEF * table of the face. The list returned will begin at the offset provided. * * Useful if the client program wishes to cache the list. * * Return value: Total number of attachment points for @glyph. * **/ 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 face->table.GDEF->table->get_attach_points (glyph, start_offset, point_count, point_array); } /** * hb_ot_layout_get_ligature_carets: * @font: The #hb_font_t to work on * @direction: The #hb_direction_t text direction to use * @glyph: The #hb_codepoint_t code point to query * @start_offset: offset of the first caret position to retrieve * @caret_count: (inout) (optional): Input = the maximum number of caret positions to return; * Output = the actual number of caret positions returned (may be zero) * @caret_array: (out) (array length=caret_count): The array of caret positions found for the query * * Fetches a list of the caret positions defined for a ligature glyph in the GDEF * table of the font. The list returned will begin at the offset provided. * * Note that a ligature that is formed from n characters will have n-1 * caret positions. The first character is not represented in the array, * since its caret position is the glyph position. * * The positions returned by this function are 'unshaped', and will have to * be fixed up for kerning that may be applied to the ligature glyph. * * Return value: Total number of ligature caret positions for @glyph. * **/ 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 */, hb_position_t *caret_array /* OUT */) { return font->face->table.GDEF->table->get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array); } #endif /* * GSUB/GPOS */ bool GSUB::is_blocklisted (hb_blob_t *blob HB_UNUSED, hb_face_t *face) const { #ifdef HB_NO_OT_LAYOUT_BLOCKLIST return false; #endif return false; } bool GPOS::is_blocklisted (hb_blob_t *blob HB_UNUSED, hb_face_t *face HB_UNUSED) const { #ifdef HB_NO_OT_LAYOUT_BLOCKLIST return false; #endif return false; } 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 *face->table.GSUB->table; case HB_OT_TAG_GPOS: return *face->table.GPOS->table; default: return Null (OT::GSUBGPOS); } } /** * hb_ot_layout_table_get_script_tags: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @start_offset: offset of the first script tag to retrieve * @script_count: (inout) (optional): Input = the maximum number of script tags to return; * Output = the actual number of script tags returned (may be zero) * @script_tags: (out) (array length=script_count): The array of #hb_tag_t script tags found for the query * * Fetches a list of all scripts enumerated in the specified face's GSUB table * or GPOS table. The list returned will begin at the offset provided. * * Return value: Total number of script tags. * **/ 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_ot_layout_table_find_script: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_tag: #hb_tag_t of the script tag requested * @script_index: (out): The index of the requested script tag * * Fetches the index if a given script tag in the specified face's GSUB table * or GPOS table. * * Return value: `true` if the script is found, `false` otherwise * **/ 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 /* OUT */) { static_assert ((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; } #ifndef HB_DISABLE_DEPRECATED /** * hb_ot_layout_table_choose_script: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_tags: Array of #hb_tag_t script tags * @script_index: (out): The index of the requested script tag * @chosen_script: (out): #hb_tag_t of the script tag requested * * Deprecated since 2.0.0 **/ 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 /* OUT */, hb_tag_t *chosen_script /* OUT */) { const hb_tag_t *t; for (t = script_tags; *t; t++); return hb_ot_layout_table_select_script (face, table_tag, t - script_tags, script_tags, script_index, chosen_script); } #endif /** * hb_ot_layout_table_select_script: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_count: Number of script tags in the array * @script_tags: Array of #hb_tag_t script tags * @script_index: (out) (optional): The index of the requested script * @chosen_script: (out) (optional): #hb_tag_t of the requested script * * Selects an OpenType script for @table_tag from the @script_tags array. * * If the table does not have any of the requested scripts, then `DFLT`, * `dflt`, and `latn` tags are tried in that order. If the table still does not * have any of these scripts, @script_index and @chosen_script are set to * #HB_OT_LAYOUT_NO_SCRIPT_INDEX. * * Return value: * `true` if one of the requested scripts is selected, `false` if a fallback * script is selected or if no scripts are selected. * * Since: 2.0.0 **/ hb_bool_t hb_ot_layout_table_select_script (hb_face_t *face, hb_tag_t table_tag, unsigned int script_count, const hb_tag_t *script_tags, unsigned int *script_index /* OUT */, hb_tag_t *chosen_script /* OUT */) { static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX), ""); const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); unsigned int i; for (i = 0; i < script_count; i++) { if (g.find_script_index (script_tags[i], script_index)) { if (chosen_script) *chosen_script = script_tags[i]; return true; } } /* 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; } /** * hb_ot_layout_table_get_feature_tags: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @start_offset: offset of the first feature tag to retrieve * @feature_count: (inout) (optional): Input = the maximum number of feature tags to return; * Output = the actual number of feature tags returned (may be zero) * @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, 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_ot_layout_table_find_feature: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @feature_tag: The #hb_tag_t of the requested feature tag * @feature_index: (out): The index of the requested feature * * Fetches the index for a given feature tag in the specified face's GSUB table * 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, hb_tag_t table_tag, hb_tag_t feature_tag, unsigned int *feature_index /* OUT */) { static_assert ((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; } /** * hb_ot_layout_script_get_language_tags: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_index: The index of the requested script tag * @start_offset: offset of the first language tag to retrieve * @language_count: (inout) (optional): Input = the maximum number of language tags to return; * Output = the actual number of language tags returned (may be zero) * @language_tags: (out) (array length=language_count): Array of language tags found in the table * * Fetches a list of language tags in the given face's GSUB or GPOS table, underneath * the specified script index. The list returned will begin at the offset provided. * * Return value: Total number of language tags. * * Since: 0.6.0 * **/ 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); } #ifndef HB_DISABLE_DEPRECATED /** * hb_ot_layout_script_find_language: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_index: The index of the requested script tag * @language_tag: The #hb_tag_t of the requested language * @language_index: The index of the requested language * * Fetches the index of a given language tag in the specified face's GSUB table * or GPOS table, underneath the specified script tag. * * Return value: `true` if the language tag is found, `false` otherwise * * Since: 0.6.0 * Deprecated: 2.0.0 **/ 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) { return hb_ot_layout_script_select_language (face, table_tag, script_index, 1, &language_tag, language_index); } #endif /** * hb_ot_layout_script_select_language: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_index: The index of the requested script tag * @language_count: The number of languages in the specified script * @language_tags: The array of language tags * @language_index: (out): The index of the requested language * * Fetches the index of the first language tag fom @language_tags that is present * in the specified face's GSUB or GPOS table, underneath the specified script * index. * * If none of the given language tags is found, `false` is returned and * @language_index is set to the default language index. * * Return value: `true` if one of the given language tags is found, `false` otherwise * * Since: 2.0.0 **/ hb_bool_t hb_ot_layout_script_select_language (hb_face_t *face, hb_tag_t table_tag, unsigned int script_index, unsigned int language_count, const hb_tag_t *language_tags, unsigned int *language_index /* OUT */) { static_assert ((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); unsigned int i; for (i = 0; i < language_count; i++) { if (s.find_lang_sys_index (language_tags[i], language_index)) return true; } /* try finding 'dflt' */ 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_ot_layout_language_get_required_feature_index: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_index: The index of the requested script tag * @language_index: The index of the requested language tag * @feature_index: (out): The index of the requested feature * * Fetches the index of a requested feature in the given face's GSUB or GPOS table, * underneath the specified script and language. * * 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, hb_tag_t table_tag, unsigned int script_index, unsigned int language_index, unsigned int *feature_index /* OUT */) { return hb_ot_layout_language_get_required_feature (face, table_tag, script_index, language_index, feature_index, nullptr); } /** * hb_ot_layout_language_get_required_feature: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_index: The index of the requested script tag * @language_index: The index of the requested language tag * @feature_index: (out): The index of the requested feature * @feature_tag: (out): The #hb_tag_t of the requested feature * * Fetches the tag of a requested feature index in the given face's GSUB or GPOS table, * underneath the specified script and language. * * Return value: `true` if the feature is found, `false` otherwise * * 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 /* OUT */, hb_tag_t *feature_tag /* 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); 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 (); } /** * hb_ot_layout_language_get_feature_indexes: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_index: The index of the requested script tag * @language_index: The index of the requested language tag * @start_offset: offset of the first feature tag to retrieve * @feature_count: (inout) (optional): Input = the maximum number of feature tags to return; * Output: the actual number of feature tags returned (may be zero) * @feature_indexes: (out) (array length=feature_count): The array of feature indexes found for the query * * Fetches a list of all features in the specified face's GSUB table * or GPOS table, underneath the specified script and language. The list * 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, 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); } /** * hb_ot_layout_language_get_feature_tags: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_index: The index of the requested script tag * @language_index: The index of the requested language tag * @start_offset: offset of the first feature tag to retrieve * @feature_count: (inout) (optional): Input = the maximum number of feature tags to return; * Output = the actual number of feature tags returned (may be zero) * @feature_tags: (out) (array length=feature_count): The array of #hb_tag_t feature tags found for the query * * Fetches a list of all features in the specified face's GSUB table * or GPOS table, underneath the specified script and language. The list * 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, 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); static_assert ((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_ot_layout_language_find_feature: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @script_index: The index of the requested script tag * @language_index: The index of the requested language tag * @feature_tag: #hb_tag_t of the feature tag requested * @feature_index: (out): The index of the requested feature * * Fetches the index of a given feature tag in the specified face's GSUB table * or GPOS table, underneath the specified script and language. * * 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, hb_tag_t table_tag, unsigned int script_index, unsigned int language_index, hb_tag_t feature_tag, unsigned int *feature_index /* OUT */) { static_assert ((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; } /** * hb_ot_layout_feature_get_lookups: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @feature_index: The index of the requested feature * @start_offset: offset of the first lookup to retrieve * @lookup_count: (inout) (optional): Input = the maximum number of lookups to return; * Output = the actual number of lookups returned (may be zero) * @lookup_indexes: (out) (array length=lookup_count): The array of lookup indexes found for the query * * Fetches a list of all lookups enumerated for the specified feature, in * the specified face's GSUB table or GPOS table. The list returned will * begin at the offset provided. * * Return value: Total number of lookups. * * 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 */) { return hb_ot_layout_feature_with_variations_get_lookups (face, table_tag, feature_index, HB_OT_LAYOUT_NO_VARIATIONS_INDEX, start_offset, lookup_count, lookup_indexes); } /** * hb_ot_layout_table_get_lookup_count: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * * Fetches the total number of lookups enumerated in the specified * face's GSUB table or GPOS table. * * Return value: Total number of lookups. * * Since: 0.9.22 **/ unsigned int hb_ot_layout_table_get_lookup_count (hb_face_t *face, hb_tag_t table_tag) { return get_gsubgpos_table (face, table_tag).get_lookup_count (); } struct hb_collect_features_context_t { hb_collect_features_context_t (hb_face_t *face, hb_tag_t table_tag, hb_set_t *feature_indices_, const hb_tag_t *features) : g (get_gsubgpos_table (face, table_tag)), feature_indices (feature_indices_), has_feature_filter (false), script_count (0),langsys_count (0), feature_index_count (0) { compute_feature_filter (features); } void compute_feature_filter (const hb_tag_t *features) { if (features == nullptr) { has_feature_filter = false; return; } has_feature_filter = true; hb_set_t features_set; for (; *features; features++) features_set.add (*features); for (unsigned i = 0; i < g.get_feature_count (); i++) { hb_tag_t tag = g.get_feature_tag (i); if (features_set.has (tag)) feature_indices_filter.add(i); } } bool visited (const OT::Script &s) { /* We might have Null() object here. Don't want to involve * that in the memoize. So, detect empty objects and return. */ if (unlikely (!s.has_default_lang_sys () && !s.get_lang_sys_count ())) return true; if (script_count++ > HB_MAX_SCRIPTS) return true; return visited (s, visited_script); } bool visited (const OT::LangSys &l) { /* We might have Null() object here. Don't want to involve * that in the memoize. So, detect empty objects and return. */ if (unlikely (!l.has_required_feature () && !l.get_feature_count ())) return true; if (langsys_count++ > HB_MAX_LANGSYS) return true; return visited (l, visited_langsys); } bool visited_feature_indices (unsigned count) { feature_index_count += count; return feature_index_count > HB_MAX_FEATURE_INDICES; } private: template bool visited (const T &p, hb_set_t &visited_set) { hb_codepoint_t delta = (hb_codepoint_t) ((uintptr_t) &p - (uintptr_t) &g); if (visited_set.has (delta)) return true; visited_set.add (delta); return false; } public: const OT::GSUBGPOS &g; hb_set_t *feature_indices; hb_set_t feature_indices_filter; bool has_feature_filter; private: hb_set_t visited_script; hb_set_t visited_langsys; unsigned int script_count; unsigned int langsys_count; unsigned int feature_index_count; }; static void langsys_collect_features (hb_collect_features_context_t *c, const OT::LangSys &l) { if (c->visited (l)) return; if (!c->has_feature_filter) { /* All features. */ if (l.has_required_feature () && !c->visited_feature_indices (1)) c->feature_indices->add (l.get_required_feature_index ()); // TODO(garretrieger): filter out indices >= feature count? if (!c->visited_feature_indices (l.featureIndex.len)) l.add_feature_indexes_to (c->feature_indices); } else { if (c->feature_indices_filter.is_empty()) return; unsigned int num_features = l.get_feature_count (); for (unsigned int i = 0; i < num_features; i++) { unsigned int feature_index = l.get_feature_index (i); if (!c->feature_indices_filter.has (feature_index)) continue; c->feature_indices->add (feature_index); c->feature_indices_filter.del (feature_index); } } } static void script_collect_features (hb_collect_features_context_t *c, const OT::Script &s, const hb_tag_t *languages) { if (c->visited (s)) return; if (!languages) { /* All languages. */ if (s.has_default_lang_sys ()) langsys_collect_features (c, s.get_default_lang_sys ()); unsigned int count = s.get_lang_sys_count (); for (unsigned int language_index = 0; language_index < count; language_index++) langsys_collect_features (c, s.get_lang_sys (language_index)); } else { for (; *languages; languages++) { unsigned int language_index; if (s.find_lang_sys_index (*languages, &language_index)) langsys_collect_features (c, s.get_lang_sys (language_index)); } } } /** * hb_ot_layout_collect_features: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @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 * or GPOS table, underneath the specified scripts, languages, and features. * If no list of scripts is provided, all scripts will be queried. If no list * of languages is provided, all languages will be queried. If no list of * features is provided, all features will be queried. * * Since: 1.8.5 **/ void hb_ot_layout_collect_features (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 *feature_indexes /* OUT */) { hb_collect_features_context_t c (face, table_tag, feature_indexes, features); if (!scripts) { /* All scripts. */ unsigned int count = c.g.get_script_count (); for (unsigned int script_index = 0; script_index < count; script_index++) script_collect_features (&c, c.g.get_script (script_index), languages); } else { for (; *scripts; scripts++) { unsigned int script_index; if (c.g.find_script_index (*scripts, &script_index)) script_collect_features (&c, c.g.get_script (script_index), languages); } } } /** * hb_ot_layout_collect_lookups: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @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 * table or GPOS table, underneath the specified scripts, languages, and * features. If no list of scripts is provided, all scripts will be queried. * If no list of languages is provided, all languages will be queried. If no * list of features is provided, all features will be queried. * * 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 */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); hb_set_t feature_indexes; hb_ot_layout_collect_features (face, table_tag, scripts, languages, features, &feature_indexes); for (hb_codepoint_t feature_index = HB_SET_VALUE_INVALID; 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); } #ifndef HB_NO_LAYOUT_COLLECT_GLYPHS /** * hb_ot_layout_lookup_collect_glyphs: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @lookup_index: The index of the feature lookup to query * @glyphs_before: (out): Array of glyphs preceding the substitution range * @glyphs_input: (out): Array of input glyphs that would be substituted by the lookup * @glyphs_after: (out): Array of glyphs following the substitution range * @glyphs_output: (out): Array of glyphs that would be the substituted output of the lookup * * Fetches a list of all glyphs affected by the specified lookup in the * specified face's GSUB table or GPOS table. * * 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 */) { 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 = face->table.GSUB->table->get_lookup (lookup_index); l.collect_glyphs (&c); return; } case HB_OT_TAG_GPOS: { const OT::PosLookup& l = face->table.GPOS->table->get_lookup (lookup_index); l.collect_glyphs (&c); return; } } } #endif /* Variations support */ /** * hb_ot_layout_table_find_feature_variations: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @coords: The variation coordinates to query * @num_coords: The number of variation coordinates * @variations_index: (out): The array of feature variations found for the query * * Fetches a list of feature variations in the specified face's GSUB table * or GPOS table, at the specified variation coordinates. * * 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, hb_tag_t table_tag, const int *coords, unsigned int num_coords, unsigned int *variations_index /* out */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); return g.find_variations_index (coords, num_coords, variations_index); } /** * hb_ot_layout_feature_with_variations_get_lookups: * @face: #hb_face_t to work upon * @table_tag: #HB_OT_TAG_GSUB or #HB_OT_TAG_GPOS * @feature_index: The index of the feature to query * @variations_index: The index of the feature variation to query * @start_offset: offset of the first lookup to retrieve * @lookup_count: (inout) (optional): Input = the maximum number of lookups to return; * Output = the actual number of lookups returned (may be zero) * @lookup_indexes: (out) (array length=lookup_count): The array of lookups found for the query * * Fetches a list of all lookups enumerated for the specified feature, in * the specified face's GSUB table or GPOS table, enabled at the specified * variations index. The list returned will begin at the offset provided. * * Return value: Total number of lookups. * * Since: 1.4.0 * **/ unsigned int hb_ot_layout_feature_with_variations_get_lookups (hb_face_t *face, hb_tag_t table_tag, unsigned int feature_index, unsigned int variations_index, unsigned int start_offset, unsigned int *lookup_count /* IN/OUT */, unsigned int *lookup_indexes /* OUT */) { static_assert ((OT::FeatureVariations::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_VARIATIONS_INDEX), ""); const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); const OT::Feature &f = g.get_feature_variation (feature_index, variations_index); return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes); } /* * OT::GSUB */ /** * hb_ot_layout_has_substitution: * @face: #hb_face_t to work upon * * Tests whether the specified face includes any GSUB substitutions. * * Return value: `true` if data found, `false` otherwise * * Since: 0.6.0 * **/ hb_bool_t hb_ot_layout_has_substitution (hb_face_t *face) { return face->table.GSUB->table->has_data (); } /** * hb_ot_layout_lookup_would_substitute: * @face: #hb_face_t to work upon * @lookup_index: The index of the lookup to query * @glyphs: The sequence of glyphs to query for substitution * @glyphs_length: The length of the glyph sequence * @zero_context: #hb_bool_t indicating whether pre-/post-context are disallowed * in substitutions * * Tests whether a specified lookup in the specified face would * trigger a substitution on the given glyph sequence. * * Return value: `true` if a substitution would be triggered, `false` otherwise * * 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 (lookup_index >= face->table.GSUB->lookup_count)) return false; OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, (bool) zero_context); const OT::SubstLookup& l = face->table.GSUB->table->get_lookup (lookup_index); return l.would_apply (&c, &face->table.GSUB->accels[lookup_index]); } /** * hb_ot_layout_substitute_start: * @font: #hb_font_t to use * @buffer: #hb_buffer_t buffer to work upon * * Called before substitution lookups are performed, to ensure that glyph * class and other properties are set on the glyphs in the buffer. * **/ void hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer) { _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 * @lookup_index: index of the feature lookup to query * @glyphs: (out): Array of glyphs comprising the transitive closure of the lookup * * Compute the transitive closure of glyphs needed for a * specified lookup. * * Since: 0.9.7 **/ void hb_ot_layout_lookup_substitute_closure (hb_face_t *face, unsigned int lookup_index, hb_set_t *glyphs /* OUT */) { hb_map_t done_lookups_glyph_count; hb_hashmap_t> done_lookups_glyph_set; OT::hb_closure_context_t c (face, glyphs, &done_lookups_glyph_count, &done_lookups_glyph_set); const OT::SubstLookup& l = face->table.GSUB->table->get_lookup (lookup_index); l.closure (&c, lookup_index); } /** * hb_ot_layout_lookups_substitute_closure: * @face: #hb_face_t to work upon * @lookups: The set of lookups to query * @glyphs: (out): Array of glyphs comprising the transitive closure of the lookups * * Compute the transitive closure of glyphs needed for all of the * provided lookups. * * Since: 1.8.1 **/ void hb_ot_layout_lookups_substitute_closure (hb_face_t *face, const hb_set_t *lookups, hb_set_t *glyphs /* OUT */) { hb_map_t done_lookups_glyph_count; hb_hashmap_t> done_lookups_glyph_set; OT::hb_closure_context_t c (face, glyphs, &done_lookups_glyph_count, &done_lookups_glyph_set); const GSUB& gsub = *face->table.GSUB->table; unsigned int iteration_count = 0; unsigned int glyphs_length; do { c.reset_lookup_visit_count (); glyphs_length = glyphs->get_population (); if (lookups) { for (hb_codepoint_t lookup_index = HB_SET_VALUE_INVALID; hb_set_next (lookups, &lookup_index);) gsub.get_lookup (lookup_index).closure (&c, lookup_index); } else { for (unsigned int i = 0; i < gsub.get_lookup_count (); i++) gsub.get_lookup (i).closure (&c, i); } } while (iteration_count++ <= HB_CLOSURE_MAX_STAGES && glyphs_length != glyphs->get_population ()); } /* * GPOS */ /** * hb_ot_layout_has_positioning: * @face: #hb_face_t to work upon * * Tests whether the specified face includes any GPOS positioning. * * Return value: `true` if the face has GPOS data, `false` otherwise * **/ hb_bool_t hb_ot_layout_has_positioning (hb_face_t *face) { return face->table.GPOS->table->has_data (); } /** * hb_ot_layout_position_start: * @font: #hb_font_t to use * @buffer: #hb_buffer_t buffer to work upon * * Called before positioning lookups are performed, to ensure that glyph * attachment types and glyph-attachment chains are set for the glyphs in the buffer. * **/ void hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer) { GPOS::position_start (font, buffer); } /** * hb_ot_layout_position_finish_advances: * @font: #hb_font_t to use * @buffer: #hb_buffer_t buffer to work upon * * Called after positioning lookups are performed, to finish glyph advances. * **/ void hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer) { GPOS::position_finish_advances (font, buffer); } /** * hb_ot_layout_position_finish_offsets: * @font: #hb_font_t to use * @buffer: #hb_buffer_t buffer to work upon * * Called after positioning lookups are performed, to finish glyph offsets. * **/ void hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer) { GPOS::position_finish_offsets (font, buffer); } #ifndef HB_NO_LAYOUT_FEATURE_PARAMS /** * hb_ot_layout_get_size_params: * @face: #hb_face_t to work upon * @design_size: (out): The design size of the face * @subfamily_id: (out): The identifier of the face within the font subfamily * @subfamily_name_id: (out): The ‘name’ table name ID of the face within the font subfamily * @range_start: (out): The minimum size of the recommended size range for the face * @range_end: (out): The maximum size of the recommended size range for the face * * Fetches optical-size feature data (i.e., the `size` feature from GPOS). Note that * the subfamily_id and the subfamily name string (accessible via the subfamily_name_id) * as used here are defined as pertaining only to fonts within a font family that differ * specifically in their respective size ranges; other ways to differentiate fonts within * a subfamily are not covered by the `size` feature. * * For more information on this distinction, see the [`size` feature documentation]( * https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#tag-size). * * Return value: `true` if data found, `false` otherwise * * 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 */ hb_ot_name_id_t *subfamily_name_id, /* OUT. May be NULL */ unsigned int *range_start, /* OUT. May be NULL */ unsigned int *range_end /* OUT. May be NULL */) { const GPOS &gpos = *face->table.GPOS->table; 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) { if (design_size) *design_size = params.designSize; if (subfamily_id) *subfamily_id = params.subfamilyID; if (subfamily_name_id) *subfamily_name_id = params.subfamilyNameID; if (range_start) *range_start = params.rangeStart; if (range_end) *range_end = params.rangeEnd; return true; } } } if (design_size) *design_size = 0; if (subfamily_id) *subfamily_id = 0; if (subfamily_name_id) *subfamily_name_id = HB_OT_NAME_ID_INVALID; if (range_start) *range_start = 0; if (range_end) *range_end = 0; return false; } /** * hb_ot_layout_feature_get_name_ids: * @face: #hb_face_t to work upon * @table_tag: table tag to query, "GSUB" or "GPOS". * @feature_index: index of feature to query. * @label_id: (out) (optional): The ‘name’ table name ID that specifies a string * for a user-interface label for this feature. (May be NULL.) * @tooltip_id: (out) (optional): The ‘name’ table name ID that specifies a string * that an application can use for tooltip text for this * feature. (May be NULL.) * @sample_id: (out) (optional): The ‘name’ table name ID that specifies sample text * that illustrates the effect of this feature. (May be NULL.) * @num_named_parameters: (out) (optional): Number of named parameters. (May be zero.) * @first_param_id: (out) (optional): The first ‘name’ table name ID used to specify * strings for user-interface labels for the feature * parameters. (Must be zero if numParameters is zero.) * * Fetches name indices from feature parameters for "Stylistic Set" ('ssXX') or * "Character Variant" ('cvXX') features. * * Return value: `true` if data found, `false` otherwise * * Since: 2.0.0 **/ hb_bool_t hb_ot_layout_feature_get_name_ids (hb_face_t *face, hb_tag_t table_tag, unsigned int feature_index, hb_ot_name_id_t *label_id, /* OUT. May be NULL */ hb_ot_name_id_t *tooltip_id, /* OUT. May be NULL */ hb_ot_name_id_t *sample_id, /* OUT. May be NULL */ unsigned int *num_named_parameters, /* OUT. May be NULL */ hb_ot_name_id_t *first_param_id /* OUT. May be NULL */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); hb_tag_t feature_tag = g.get_feature_tag (feature_index); const OT::Feature &f = g.get_feature (feature_index); const OT::FeatureParams &feature_params = f.get_feature_params (); if (&feature_params != &Null (OT::FeatureParams)) { const OT::FeatureParamsStylisticSet& ss_params = feature_params.get_stylistic_set_params (feature_tag); if (&ss_params != &Null (OT::FeatureParamsStylisticSet)) /* ssXX */ { if (label_id) *label_id = ss_params.uiNameID; // ssXX features don't have the rest if (tooltip_id) *tooltip_id = HB_OT_NAME_ID_INVALID; if (sample_id) *sample_id = HB_OT_NAME_ID_INVALID; if (num_named_parameters) *num_named_parameters = 0; if (first_param_id) *first_param_id = HB_OT_NAME_ID_INVALID; return true; } const OT::FeatureParamsCharacterVariants& cv_params = feature_params.get_character_variants_params (feature_tag); if (&cv_params != &Null (OT::FeatureParamsCharacterVariants)) /* cvXX */ { if (label_id) *label_id = cv_params.featUILableNameID; if (tooltip_id) *tooltip_id = cv_params.featUITooltipTextNameID; if (sample_id) *sample_id = cv_params.sampleTextNameID; if (num_named_parameters) *num_named_parameters = cv_params.numNamedParameters; if (first_param_id) *first_param_id = cv_params.firstParamUILabelNameID; return true; } } if (label_id) *label_id = HB_OT_NAME_ID_INVALID; if (tooltip_id) *tooltip_id = HB_OT_NAME_ID_INVALID; if (sample_id) *sample_id = HB_OT_NAME_ID_INVALID; if (num_named_parameters) *num_named_parameters = 0; if (first_param_id) *first_param_id = HB_OT_NAME_ID_INVALID; return false; } /** * hb_ot_layout_feature_get_characters: * @face: #hb_face_t to work upon * @table_tag: table tag to query, "GSUB" or "GPOS". * @feature_index: index of feature to query. * @start_offset: offset of the first character to retrieve * @char_count: (inout) (optional): Input = the maximum number of characters to return; * Output = the actual number of characters returned (may be zero) * @characters: (out caller-allocates) (array length=char_count): A buffer pointer. * The Unicode codepoints of the characters for which this feature provides * glyph variants. * * Fetches a list of the characters defined as having a variant under the specified * "Character Variant" ("cvXX") feature tag. * * Return value: Number of total sample characters in the cvXX feature. * * Since: 2.0.0 **/ unsigned int hb_ot_layout_feature_get_characters (hb_face_t *face, hb_tag_t table_tag, unsigned int feature_index, unsigned int start_offset, unsigned int *char_count, /* IN/OUT. May be NULL */ hb_codepoint_t *characters /* OUT. May be NULL */) { const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag); return g.get_feature (feature_index) .get_feature_params () .get_character_variants_params(g.get_feature_tag (feature_index)) .get_characters (start_offset, char_count, characters); } #endif /* * Parts of different types are implemented here such that they have direct * access to GSUB/GPOS lookups. */ struct GSUBProxy { static constexpr unsigned table_index = 0u; static constexpr bool always_inplace = false; typedef OT::SubstLookup Lookup; GSUBProxy (hb_face_t *face) : table (*face->table.GSUB->table), accels (face->table.GSUB->accels) {} const GSUB &table; const OT::hb_ot_layout_lookup_accelerator_t *accels; }; struct GPOSProxy { static constexpr unsigned table_index = 1u; static constexpr bool always_inplace = true; typedef OT::PosLookup Lookup; GPOSProxy (hb_face_t *face) : table (*face->table.GPOS->table), accels (face->table.GPOS->accels) {} const GPOS &table; const OT::hb_ot_layout_lookup_accelerator_t *accels; }; static inline bool apply_forward (OT::hb_ot_apply_context_t *c, const OT::hb_ot_layout_lookup_accelerator_t &accel) { bool use_cache = accel.cache_enter (c); bool ret = false; hb_buffer_t *buffer = c->buffer; while (buffer->idx < buffer->len && buffer->successful) { bool applied = false; if (accel.may_have (buffer->cur().codepoint) && (buffer->cur().mask & c->lookup_mask) && c->check_glyph_property (&buffer->cur(), c->lookup_props)) { applied = accel.apply (c, use_cache); } if (applied) ret = true; else (void) buffer->next_glyph (); } if (use_cache) accel.cache_leave (c); return ret; } static inline bool apply_backward (OT::hb_ot_apply_context_t *c, const OT::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)) ret |= accel.apply (c, false); /* The reverse lookup doesn't "advance" cursor (for good reason). */ buffer->idx--; } while ((int) buffer->idx >= 0); return ret; } template static inline void apply_string (OT::hb_ot_apply_context_t *c, const typename Proxy::Lookup &lookup, const OT::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::always_inplace) buffer->clear_output (); buffer->idx = 0; apply_forward (c, accel); if (!Proxy::always_inplace) buffer->sync (); } else { /* in-place backward substitution/positioning */ assert (!buffer->have_output); buffer->idx = buffer->len - 1; apply_backward (c, 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_ot_apply_context_t c (table_index, font, buffer); c.set_recurse_func (Proxy::Lookup::template dispatch_recurse_func); for (unsigned int stage_index = 0; stage_index < stages[table_index].length; stage_index++) { 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 (&c, proxy.table.get_lookup (lookup_index), proxy.accels[lookup_index]); (void) buffer->message (font, "end lookup %d", lookup_index); } if (stage->pause_func) 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); if (!buffer->message (font, "start table GSUB")) return; apply (proxy, plan, font, buffer); (void) buffer->message (font, "end table GSUB"); } 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); if (!buffer->message (font, "start table GPOS")) return; apply (proxy, plan, font, buffer); (void) buffer->message (font, "end table GPOS"); } void hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c, const OT::SubstLookup &lookup, const OT::hb_ot_layout_lookup_accelerator_t &accel) { apply_string (c, lookup, accel); } #ifndef HB_NO_BASE /** * hb_ot_layout_get_horizontal_baseline_tag_for_script: * @script: a script tag. * * Fetches the dominant horizontal baseline tag used by @script. * * Return value: dominant baseline tag for the @script. * * Since: 4.0.0 **/ hb_ot_layout_baseline_tag_t hb_ot_layout_get_horizontal_baseline_tag_for_script (hb_script_t script) { /* Keep in sync with hb_ot_layout_get_baseline_with_fallback */ switch ((int) script) { /* Unicode-1.1 additions */ case HB_SCRIPT_BENGALI: case HB_SCRIPT_DEVANAGARI: case HB_SCRIPT_GUJARATI: case HB_SCRIPT_GURMUKHI: /* Unicode-2.0 additions */ case HB_SCRIPT_TIBETAN: /* Unicode-4.0 additions */ case HB_SCRIPT_LIMBU: /* Unicode-4.1 additions */ case HB_SCRIPT_SYLOTI_NAGRI: /* Unicode-5.0 additions */ case HB_SCRIPT_PHAGS_PA: /* Unicode-5.2 additions */ case HB_SCRIPT_MEETEI_MAYEK: /* Unicode-6.1 additions */ case HB_SCRIPT_SHARADA: case HB_SCRIPT_TAKRI: /* Unicode-7.0 additions */ case HB_SCRIPT_MODI: case HB_SCRIPT_SIDDHAM: case HB_SCRIPT_TIRHUTA: /* Unicode-9.0 additions */ case HB_SCRIPT_MARCHEN: case HB_SCRIPT_NEWA: /* Unicode-10.0 additions */ case HB_SCRIPT_SOYOMBO: case HB_SCRIPT_ZANABAZAR_SQUARE: /* Unicode-11.0 additions */ case HB_SCRIPT_DOGRA: case HB_SCRIPT_GUNJALA_GONDI: /* Unicode-12.0 additions */ case HB_SCRIPT_NANDINAGARI: return HB_OT_LAYOUT_BASELINE_TAG_HANGING; /* Unicode-1.1 additions */ case HB_SCRIPT_HANGUL: case HB_SCRIPT_HAN: case HB_SCRIPT_HIRAGANA: case HB_SCRIPT_KATAKANA: /* Unicode-3.0 additions */ case HB_SCRIPT_BOPOMOFO: /* Unicode-9.0 additions */ case HB_SCRIPT_TANGUT: /* Unicode-10.0 additions */ case HB_SCRIPT_NUSHU: /* Unicode-13.0 additions */ case HB_SCRIPT_KHITAN_SMALL_SCRIPT: return HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT; default: return HB_OT_LAYOUT_BASELINE_TAG_ROMAN; } } /** * hb_ot_layout_get_baseline: * @font: a font * @baseline_tag: a baseline tag * @direction: text direction. * @script_tag: script tag. * @language_tag: language tag, currently unused. * @coord: (out) (nullable): baseline value if found. * * Fetches a baseline value from the face. * * Return value: `true` if found baseline value in the font. * * Since: 2.6.0 **/ hb_bool_t hb_ot_layout_get_baseline (hb_font_t *font, hb_ot_layout_baseline_tag_t baseline_tag, hb_direction_t direction, hb_tag_t script_tag, hb_tag_t language_tag, hb_position_t *coord /* OUT. May be NULL. */) { return font->face->table.BASE->get_baseline (font, baseline_tag, direction, script_tag, language_tag, coord); } /** * hb_ot_layout_get_baseline_with_fallback: * @font: a font * @baseline_tag: a baseline tag * @direction: text direction. * @script_tag: script tag. * @language_tag: language tag, currently unused. * @coord: (out): baseline value if found. * * Fetches a baseline value from the face, and synthesizes * it if the font does not have it. * * Since: 4.0.0 **/ void hb_ot_layout_get_baseline_with_fallback (hb_font_t *font, hb_ot_layout_baseline_tag_t baseline_tag, hb_direction_t direction, hb_tag_t script_tag, hb_tag_t language_tag, hb_position_t *coord /* OUT */) { if (hb_ot_layout_get_baseline (font, baseline_tag, direction, script_tag, language_tag, coord)) return; /* Synthesize missing baselines. * See https://www.w3.org/TR/css-inline-3/#baseline-synthesis-fonts */ switch (baseline_tag) { case HB_OT_LAYOUT_BASELINE_TAG_ROMAN: *coord = 0; // FIXME origin ? break; case HB_OT_LAYOUT_BASELINE_TAG_MATH: { hb_codepoint_t glyph; hb_glyph_extents_t extents; if (HB_DIRECTION_IS_HORIZONTAL (direction) && (hb_font_get_nominal_glyph (font, 0x2212u, &glyph) || hb_font_get_nominal_glyph (font, '-', &glyph)) && hb_font_get_glyph_extents (font, glyph, &extents)) { *coord = extents.y_bearing + extents.height / 2; } else { hb_position_t x_height = font->y_scale / 2; #ifndef HB_NO_METRICS hb_ot_metrics_get_position_with_fallback (font, HB_OT_METRICS_TAG_X_HEIGHT, &x_height); #endif *coord = x_height / 2; } } break; case HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT: case HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT: { hb_position_t embox_top, embox_bottom; hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT, direction, script_tag, language_tag, &embox_top); hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT, direction, script_tag, language_tag, &embox_bottom); if (baseline_tag == HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT) *coord = embox_top + (embox_bottom - embox_top) / 10; else *coord = embox_bottom + (embox_top - embox_bottom) / 10; } break; case HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT: if (hb_ot_layout_get_baseline (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT, direction, script_tag, language_tag, coord)) *coord += HB_DIRECTION_IS_HORIZONTAL (direction) ? font->y_scale : font->x_scale; else { hb_font_extents_t font_extents; hb_font_get_extents_for_direction (font, direction, &font_extents); *coord = font_extents.ascender; } break; case HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT: if (hb_ot_layout_get_baseline (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT, direction, script_tag, language_tag, coord)) *coord -= HB_DIRECTION_IS_HORIZONTAL (direction) ? font->y_scale : font->x_scale; else { hb_font_extents_t font_extents; hb_font_get_extents_for_direction (font, direction, &font_extents); *coord = font_extents.descender; } break; case HB_OT_LAYOUT_BASELINE_TAG_HANGING: if (HB_DIRECTION_IS_HORIZONTAL (direction)) { hb_codepoint_t ch; hb_codepoint_t glyph; hb_glyph_extents_t extents; /* Keep in sync with hb_ot_layout_get_horizontal_baseline_for_script */ switch ((int) script_tag) { /* Unicode-1.1 additions */ case HB_SCRIPT_BENGALI: ch = 0x0995u; break; case HB_SCRIPT_DEVANAGARI: ch = 0x0915u; break; case HB_SCRIPT_GUJARATI: ch = 0x0a95u; break; case HB_SCRIPT_GURMUKHI: ch = 0x0a15u; break; /* Unicode-2.0 additions */ case HB_SCRIPT_TIBETAN: ch = 0x0f40u; break; /* Unicode-4.0 additions */ case HB_SCRIPT_LIMBU: ch = 0x1901u; break; /* Unicode-4.1 additions */ case HB_SCRIPT_SYLOTI_NAGRI: ch = 0xa807u; break; /* Unicode-5.0 additions */ case HB_SCRIPT_PHAGS_PA: ch = 0xa840u; break; /* Unicode-5.2 additions */ case HB_SCRIPT_MEETEI_MAYEK: ch = 0xabc0u; break; /* Unicode-6.1 additions */ case HB_SCRIPT_SHARADA: ch = 0x11191u; break; case HB_SCRIPT_TAKRI: ch = 0x1168cu; break; /* Unicode-7.0 additions */ case HB_SCRIPT_MODI: ch = 0x1160eu;break; case HB_SCRIPT_SIDDHAM: ch = 0x11590u; break; case HB_SCRIPT_TIRHUTA: ch = 0x1148fu; break; /* Unicode-9.0 additions */ case HB_SCRIPT_MARCHEN: ch = 0x11c72u; break; case HB_SCRIPT_NEWA: ch = 0x1140eu; break; /* Unicode-10.0 additions */ case HB_SCRIPT_SOYOMBO: ch = 0x11a5cu; break; case HB_SCRIPT_ZANABAZAR_SQUARE: ch = 0x11a0bu; break; /* Unicode-11.0 additions */ case HB_SCRIPT_DOGRA: ch = 0x1180au; break; case HB_SCRIPT_GUNJALA_GONDI: ch = 0x11d6cu; break; /* Unicode-12.0 additions */ case HB_SCRIPT_NANDINAGARI: ch = 0x119b0u; break; default: ch = 0; break; } if (ch && hb_font_get_nominal_glyph (font, ch, &glyph) && hb_font_get_glyph_extents (font, glyph, &extents)) *coord = extents.y_bearing; else *coord = font->y_scale * 6 / 10; // FIXME makes assumptions about origin } else *coord = font->x_scale * 6 / 10; // FIXME makes assumptions about origin break; case HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_CENTRAL: { hb_position_t top, bottom; hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_TOP_OR_RIGHT, direction, script_tag, language_tag, &top); hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT, direction, script_tag, language_tag, &bottom); *coord = (top + bottom) / 2; } break; case HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_CENTRAL: { hb_position_t top, bottom; hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_TOP_OR_RIGHT, direction, script_tag, language_tag, &top); hb_ot_layout_get_baseline_with_fallback (font, HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_BOTTOM_OR_LEFT, direction, script_tag, language_tag, &bottom); *coord = (top + bottom) / 2; } break; case _HB_OT_LAYOUT_BASELINE_TAG_MAX_VALUE: default: *coord = 0; break; } } #endif struct hb_get_glyph_alternates_dispatch_t : hb_dispatch_context_t { static return_t default_return_value () { return 0; } bool stop_sublookup_iteration (return_t r) const { return r; } private: template auto _dispatch (const T &obj, hb_priority<1>, Ts&&... ds) HB_AUTO_RETURN ( obj.get_glyph_alternates (std::forward (ds)...) ) template auto _dispatch (const T &obj, hb_priority<0>, Ts&&... ds) HB_AUTO_RETURN ( default_return_value () ) public: template auto dispatch (const T &obj, Ts&&... ds) HB_AUTO_RETURN ( _dispatch (obj, hb_prioritize, std::forward (ds)...) ) }; /** * hb_ot_layout_lookup_get_glyph_alternates: * @face: a face. * @lookup_index: index of the feature lookup to query. * @glyph: a glyph id. * @start_offset: starting offset. * @alternate_count: (inout) (optional): Input = the maximum number of alternate glyphs to return; * Output = the actual number of alternate glyphs returned (may be zero). * @alternate_glyphs: (out caller-allocates) (array length=alternate_count): A glyphs buffer. * Alternate glyphs associated with the glyph id. * * Fetches alternates of a glyph from a given GSUB lookup index. * * Return value: Total number of alternates found in the specific lookup index for the given glyph id. * * Since: 2.6.8 **/ HB_EXTERN unsigned hb_ot_layout_lookup_get_glyph_alternates (hb_face_t *face, unsigned lookup_index, hb_codepoint_t glyph, unsigned start_offset, unsigned *alternate_count /* IN/OUT. May be NULL. */, hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */) { 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; } #endif