diff options
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.cc')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.cc | 1993 |
1 files changed, 0 insertions, 1993 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.cc b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.cc deleted file mode 100644 index f25f0f9e23e..00000000000 --- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout.cc +++ /dev/null @@ -1,1993 +0,0 @@ -/* - * 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 ¶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) (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 |