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-/*
- * 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" // Just so we compile it; unused otherwise.
-#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.
-
-/**
- * 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);
-
- kern.apply (&c);
-}
-#endif
-
-
-/*
- * GDEF
- */
-
-bool
-OT::GDEF::is_blocklisted (hb_blob_t *blob,
- hb_face_t *face) const
-{
-#ifdef HB_NO_OT_LAYOUT_BLACKLIST
- 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]);
- buffer->info[i].syllable() = 0;
- }
-}
-
-/* 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) (allow-none): 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.
- *
- **/
-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) (allow-none): 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.
- *
- **/
-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
-OT::GSUB::is_blocklisted (hb_blob_t *blob HB_UNUSED,
- hb_face_t *face) const
-{
-#ifdef HB_NO_OT_LAYOUT_BLACKLIST
- return false;
-#endif
- return false;
-}
-
-bool
-OT::GPOS::is_blocklisted (hb_blob_t *blob HB_UNUSED,
- hb_face_t *face HB_UNUSED) const
-{
-#ifdef HB_NO_OT_LAYOUT_BLACKLIST
- 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) (allow-none): 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.
- *
- **/
-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): The index of the requested script
- * @chosen_script: (out): #hb_tag_t of the requested script
- *
- * 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) (allow-none): 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.
- *
- **/
-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 og 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
- **/
-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) (allow-none): 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.
- *
- **/
-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: ??
- * Deprecated: ??
- **/
-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 a given language tag in the specified face's GSUB table
- * or GPOS table, underneath the specified script index.
- *
- * Return value: %true if the language tag 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
- *
- **/
-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) (allow-none): 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.
- **/
-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) (allow-none): 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.
- *
- **/
-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
- *
- **/
-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) (allow-none): 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.
- *
- * 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.
- *
- * 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_indexes_)
- : g (get_gsubgpos_table (face, table_tag)),
- feature_indexes (feature_indexes_),
- script_count (0),langsys_count (0), feature_index_count (0) {}
-
- 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_indexes;
-
- 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,
- const hb_tag_t *features)
-{
- if (c->visited (l)) return;
-
- if (!features)
- {
- /* All features. */
- if (l.has_required_feature () && !c->visited_feature_indices (1))
- c->feature_indexes->add (l.get_required_feature_index ());
-
- if (!c->visited_feature_indices (l.featureIndex.len))
- l.add_feature_indexes_to (c->feature_indexes);
- }
- else
- {
- /* Ugh. Any faster way? */
- for (; *features; features++)
- {
- hb_tag_t feature_tag = *features;
- 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 (feature_tag == c->g.get_feature_tag (feature_index))
- {
- c->feature_indexes->add (feature_index);
- break;
- }
- }
- }
- }
-}
-
-static void
-script_collect_features (hb_collect_features_context_t *c,
- const OT::Script &s,
- const hb_tag_t *languages,
- const hb_tag_t *features)
-{
- if (c->visited (s)) return;
-
- if (!languages)
- {
- /* All languages. */
- if (s.has_default_lang_sys ())
- langsys_collect_features (c,
- s.get_default_lang_sys (),
- features);
-
- 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),
- features);
- }
- 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),
- features);
- }
- }
-}
-
-
-/**
- * hb_ot_layout_collect_features:
- * @face: #hb_face_t to work upon
- * @table_tag: HB_OT_TAG_GSUB or HB_OT_TAG_GPOS
- * @scripts: The array of scripts to collect features for
- * @languages: The array of languages to collect features for
- * @features: The array of features to collect
- * @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);
- 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,
- features);
- }
- 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,
- features);
- }
- }
-}
-
-
-/**
- * hb_ot_layout_collect_lookups:
- * @face: #hb_face_t to work upon
- * @table_tag: HB_OT_TAG_GSUB or HB_OT_TAG_GPOS
- * @scripts: The array of scripts to collect lookups for
- * @languages: The array of languages to collect lookups for
- * @features: The array of features to collect lookups for
- * @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.
- *
- **/
-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) (allow-none): 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.
- *
- **/
-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
- *
- **/
-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 substitutions should be context-free
- *
- * 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;
- OT::hb_closure_context_t c (face, glyphs, &done_lookups);
-
- 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;
- OT::hb_closure_context_t c (face, glyphs, &done_lookups);
- const OT::GSUB& gsub = *face->table.GSUB->table;
-
- unsigned int iteration_count = 0;
- unsigned int glyphs_length;
- do
- {
- 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 ());
-}
-
-/*
- * OT::GPOS
- */
-
-
-/**
- * hb_ot_layout_has_positioning:
- * @face: #hb_face_t to work upon
- *
- * 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)
-{
- OT::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)
-{
- OT::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)
-{
- OT::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 OT::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 &params = 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) (allow-none): The ‘name’ table name ID that specifies a string
- * for a user-interface label for this feature. (May be NULL.)
- * @tooltip_id: (out) (allow-none): 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) (allow-none): The ‘name’ table name ID that specifies sample text
- * that illustrates the effect of this feature. (May be NULL.)
- * @num_named_parameters: (out) (allow-none): Number of named parameters. (May be zero.)
- * @first_param_id: (out) (allow-none): 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) (allow-none): 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 inplace = false;
- typedef OT::SubstLookup Lookup;
-
- GSUBProxy (hb_face_t *face) :
- table (*face->table.GSUB->table),
- accels (face->table.GSUB->accels) {}
-
- const OT::GSUB &table;
- const OT::hb_ot_layout_lookup_accelerator_t *accels;
-};
-
-struct GPOSProxy
-{
- static constexpr unsigned table_index = 1u;
- static constexpr bool inplace = true;
- typedef OT::PosLookup Lookup;
-
- GPOSProxy (hb_face_t *face) :
- table (*face->table.GPOS->table),
- accels (face->table.GPOS->accels) {}
-
- const OT::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 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);
- }
-
- if (applied)
- ret = true;
- else
- buffer->next_glyph ();
- }
- 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);
-
- /* The reverse lookup doesn't "advance" cursor (for good reason). */
- buffer->idx--;
-
- }
- while ((int) buffer->idx >= 0);
- return ret;
-}
-
-template <typename Proxy>
-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::table_index == 0u)
- buffer->clear_output ();
- buffer->idx = 0;
-
- bool ret;
- ret = apply_forward (c, accel);
- if (ret)
- {
- if (!Proxy::inplace)
- buffer->swap_buffers ();
- else
- assert (!buffer->has_separate_output ());
- }
- }
- else
- {
- /* in-place backward substitution/positioning */
- if (Proxy::table_index == 0u)
- buffer->remove_output ();
- buffer->idx = buffer->len - 1;
-
- apply_backward (c, accel);
- }
-}
-
-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::apply_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);
- if (lookups[table_index][i].random)
- {
- c.set_random (true);
- buffer->unsafe_to_break_all ();
- }
- apply_string<Proxy> (&c,
- proxy.table.get_lookup (lookup_index),
- proxy.accels[lookup_index]);
- (void) buffer->message (font, "end lookup %d", lookup_index);
- }
-
- if (stage->pause_func)
- {
- buffer->clear_output ();
- stage->pause_func (plan, font, buffer);
- }
- }
-}
-
-void hb_ot_map_t::substitute (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
-{
- GSUBProxy proxy (font->face);
- 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_baseline:
- * @font: a font
- * @baseline_tag: a baseline tag
- * @direction: text direction.
- * @script_tag: script tag.
- * @language_tag: language tag.
- * @coord: (out): baseline value if found.
- *
- * Fetches a baseline value from the face.
- *
- * Return value: 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. */)
-{
- bool result = font->face->table.BASE->get_baseline (font, baseline_tag, direction, script_tag, language_tag, coord);
-
- if (result && coord)
- *coord = HB_DIRECTION_IS_HORIZONTAL (direction) ? font->em_scale_y (*coord) : font->em_scale_x (*coord);
-
- return result;
-}
-#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; }
-
- hb_face_t *face;
-
- hb_get_glyph_alternates_dispatch_t (hb_face_t *face) :
- face (face) {}
-
- private:
- template <typename T, typename ...Ts> auto
- _dispatch (const T &obj, hb_priority<1>, Ts&&... ds) HB_AUTO_RETURN
- ( obj.get_glyph_alternates (hb_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, hb_forward<Ts> (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) (allow-none): 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 (face);
- 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