| /* |
| * 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::kern> (); |
| |
| 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 chosen script |
| * @chosen_script: (out): #hb_tag_t of the chosen script |
| * |
| * 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 is set to |
| * #HB_OT_LAYOUT_NO_SCRIPT_INDEX and @chosen_script is set to #HB_TAG_NONE. |
| * |
| * 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_TAG_NONE; |
| 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_language2: |
| * @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 chosen language |
| * @chosen_language: (out): #hb_tag_t of the chosen 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 #HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX and |
| * @chosen_language is set to #HB_TAG_NONE. |
| * |
| * Return value: `true` if one of the given language tags is found, `false` otherwise |
| * |
| * Since: REPLACEME |
| **/ |
| hb_bool_t |
| hb_ot_layout_script_select_language2 (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 */, |
| hb_tag_t *chosen_language /* 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)) |
| { |
| if (chosen_language) |
| *chosen_language = language_tags[i]; |
| return true; |
| } |
| } |
| |
| /* try finding 'dflt' */ |
| if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index)) |
| { |
| if (chosen_language) |
| *chosen_language = HB_OT_TAG_DEFAULT_LANGUAGE; |
| return false; |
| } |
| |
| if (language_index) |
| *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX; |
| if (chosen_language) |
| *chosen_language = HB_TAG_NONE; |
| return false; |
| } |
| |
| /** |
| * 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 */) |
| { |
| return hb_ot_layout_script_select_language2 (face, table_tag, |
| script_index, |
| language_count, language_tags, |
| language_index, nullptr); |
| } |
| |
| /** |
| * 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 <typename T> |
| 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, nullptr, 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); |
| } |
| |
| /** |
| * 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<unsigned, hb::unique_ptr<hb_set_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<unsigned, hb::unique_ptr<hb_set_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.digest.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.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); |
| |
| /* The reverse lookup doesn't "advance" cursor (for good reason). */ |
| buffer->idx--; |
| |
| } |
| while ((int) buffer->idx >= 0); |
| return ret; |
| } |
| |
| template <typename Proxy> |
| 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 ret; |
| |
| 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; |
| ret = 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; |
| ret = apply_backward (c, accel); |
| } |
| |
| return ret; |
| } |
| |
| template <typename Proxy> |
| 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<OT::hb_ot_apply_context_t>); |
| |
| 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++) |
| { |
| auto &lookup = lookups[table_index][i]; |
| |
| unsigned int lookup_index = lookup.index; |
| if (!buffer->message (font, "start lookup %u 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 %u feature '%c%c%c%c' because no glyph matches", lookup_index, HB_UNTAG (lookup.feature_tag)); |
| |
| (void) buffer->message (font, "end lookup %u feature '%c%c%c%c'", lookup_index, HB_UNTAG (lookup.feature_tag)); |
| } |
| |
| if (stage->pause_func) |
| { |
| if (stage->pause_func (plan, font, buffer)) |
| { |
| /* Refresh working buffer digest since buffer changed. */ |
| c.digest = buffer->digest (); |
| } |
| } |
| } |
| } |
| |
| 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<GSUBProxy> (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<hb_get_glyph_alternates_dispatch_t, unsigned> |
| { |
| static return_t default_return_value () { return 0; } |
| 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.get_glyph_alternates (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)...) ) |
| }; |
| |
| #ifndef HB_NO_LAYOUT_RARELY_USED |
| /** |
| * 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; |
| } |
| |
| |
| 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 |