--- old/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ot-layout.cc 2020-07-21 14:25:43.086861633 -0700 +++ /dev/null 2020-01-23 11:31:37.155195123 -0800 @@ -1,1531 +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-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-gasp-table.hh" // Just so we compile it; unused otherwise. -#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-lcar-table.hh" -#include "hb-aat-layout-morx-table.hh" - - -/** - * 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 - */ - -bool -hb_ot_layout_has_kerning (hb_face_t *face) -{ - return face->table.kern->has_data (); -} - -bool -hb_ot_layout_has_machine_kerning (hb_face_t *face) -{ - return face->table.kern->has_state_machine (); -} - -bool -hb_ot_layout_has_cross_kerning (hb_face_t *face) -{ - return face->table.kern->has_cross_stream (); -} - -void -hb_ot_layout_kern (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer) -{ - hb_blob_t *blob = font->face->table.kern.get_blob (); - const AAT::kern& kern = *blob->as (); - - AAT::hb_aat_apply_context_t c (plan, font, buffer, blob); - - kern.apply (&c); -} - - -/* - * GDEF - */ - -bool -OT::GDEF::is_blacklisted (hb_blob_t *blob, - hb_face_t *face) const -{ - /* The ugly business of blacklisting 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 - */ -#define ENCODE(x,y,z) (((uint64_t) (x) << 48) | ((uint64_t) (y) << 24) | (uint64_t) (z)) - switch ENCODE(blob->length, - face->table.GSUB->table.get_length (), - face->table.GPOS->table.get_length ()) - { - /* sha1sum:c5ee92f0bca4bfb7d06c4d03e8cf9f9cf75d2e8a Windows 7? timesi.ttf */ - case ENCODE (442, 2874, 42038): - /* sha1sum:37fc8c16a0894ab7b749e35579856c73c840867b Windows 7? timesbi.ttf */ - case ENCODE (430, 2874, 40662): - /* sha1sum:19fc45110ea6cd3cdd0a5faca256a3797a069a80 Windows 7 timesi.ttf */ - case ENCODE (442, 2874, 39116): - /* sha1sum:6d2d3c9ed5b7de87bc84eae0df95ee5232ecde26 Windows 7 timesbi.ttf */ - case ENCODE (430, 2874, 39374): - /* sha1sum:8583225a8b49667c077b3525333f84af08c6bcd8 OS X 10.11.3 Times New Roman Italic.ttf */ - case ENCODE (490, 3046, 41638): - /* sha1sum:ec0f5a8751845355b7c3271d11f9918a966cb8c9 OS X 10.11.3 Times New Roman Bold Italic.ttf */ - case ENCODE (478, 3046, 41902): - /* sha1sum:96eda93f7d33e79962451c6c39a6b51ee893ce8c tahoma.ttf from Windows 8 */ - case ENCODE (898, 12554, 46470): - /* sha1sum:20928dc06014e0cd120b6fc942d0c3b1a46ac2bc tahomabd.ttf from Windows 8 */ - case ENCODE (910, 12566, 47732): - /* sha1sum:4f95b7e4878f60fa3a39ca269618dfde9721a79e tahoma.ttf from Windows 8.1 */ - case ENCODE (928, 23298, 59332): - /* sha1sum:6d400781948517c3c0441ba42acb309584b73033 tahomabd.ttf from Windows 8.1 */ - case ENCODE (940, 23310, 60732): - /* tahoma.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ - case ENCODE (964, 23836, 60072): - /* tahomabd.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ - case ENCODE (976, 23832, 61456): - /* sha1sum:e55fa2dfe957a9f7ec26be516a0e30b0c925f846 tahoma.ttf from Windows 10 */ - case ENCODE (994, 24474, 60336): - /* sha1sum:7199385abb4c2cc81c83a151a7599b6368e92343 tahomabd.ttf from Windows 10 */ - case ENCODE (1006, 24470, 61740): - /* tahoma.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ - case ENCODE (1006, 24576, 61346): - /* tahomabd.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ - case ENCODE (1018, 24572, 62828): - /* sha1sum:b9c84d820c49850d3d27ec498be93955b82772b5 tahoma.ttf from Windows 10 AU */ - case ENCODE (1006, 24576, 61352): - /* sha1sum:2bdfaab28174bdadd2f3d4200a30a7ae31db79d2 tahomabd.ttf from Windows 10 AU */ - case ENCODE (1018, 24572, 62834): - /* sha1sum:b0d36cf5a2fbe746a3dd277bffc6756a820807a7 Tahoma.ttf from Mac OS X 10.9 */ - case ENCODE (832, 7324, 47162): - /* sha1sum:12fc4538e84d461771b30c18b5eb6bd434e30fba Tahoma Bold.ttf from Mac OS X 10.9 */ - case ENCODE (844, 7302, 45474): - /* sha1sum:eb8afadd28e9cf963e886b23a30b44ab4fd83acc himalaya.ttf from Windows 7 */ - case ENCODE (180, 13054, 7254): - /* sha1sum:73da7f025b238a3f737aa1fde22577a6370f77b0 himalaya.ttf from Windows 8 */ - case ENCODE (192, 12638, 7254): - /* sha1sum:6e80fd1c0b059bbee49272401583160dc1e6a427 himalaya.ttf from Windows 8.1 */ - case ENCODE (192, 12690, 7254): - /* 8d9267aea9cd2c852ecfb9f12a6e834bfaeafe44 cantarell-fonts-0.0.21/otf/Cantarell-Regular.otf */ - /* 983988ff7b47439ab79aeaf9a45bd4a2c5b9d371 cantarell-fonts-0.0.21/otf/Cantarell-Oblique.otf */ - case ENCODE (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 ENCODE (188, 264, 3426): - /* d125afa82a77a6475ac0e74e7c207914af84b37a padauk-2.80/Padauk.ttf RHEL 7.2 */ - case ENCODE (1058, 47032, 11818): - /* 0f7b80437227b90a577cc078c0216160ae61b031 padauk-2.80/Padauk-Bold.ttf RHEL 7.2*/ - case ENCODE (1046, 47030, 12600): - /* d3dde9aa0a6b7f8f6a89ef1002e9aaa11b882290 padauk-2.80/Padauk.ttf Ubuntu 16.04 */ - case ENCODE (1058, 71796, 16770): - /* 5f3c98ccccae8a953be2d122c1b3a77fd805093f padauk-2.80/Padauk-Bold.ttf Ubuntu 16.04 */ - case ENCODE (1046, 71790, 17862): - /* 6c93b63b64e8b2c93f5e824e78caca555dc887c7 padauk-2.80/Padauk-book.ttf */ - case ENCODE (1046, 71788, 17112): - /* d89b1664058359b8ec82e35d3531931125991fb9 padauk-2.80/Padauk-bookbold.ttf */ - case ENCODE (1058, 71794, 17514): - /* 824cfd193aaf6234b2b4dc0cf3c6ef576c0d00ef padauk-3.0/Padauk-book.ttf */ - case ENCODE (1330, 109904, 57938): - /* 91fcc10cf15e012d27571e075b3b4dfe31754a8a padauk-3.0/Padauk-bookbold.ttf */ - case ENCODE (1330, 109904, 58972): - /* sha1sum: c26e41d567ed821bed997e937bc0c41435689e85 Padauk.ttf - * "Padauk Regular" "Version 2.5", see https://crbug.com/681813 */ - case ENCODE (1004, 59092, 14836): - return true; -#undef ENCODE - } - 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_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: - * - * 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: - * - * 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); -} - -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); -} - -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 */) -{ - unsigned int result_caret_count = 0; - unsigned int result = font->face->table.GDEF->table->get_lig_carets (font, direction, glyph, start_offset, &result_caret_count, caret_array); - if (result) - { - if (caret_count) *caret_count = result_caret_count; - } - else - result = font->face->table.lcar->get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array); - return result; -} - - -/* - * GSUB/GPOS - */ - -bool -OT::GSUB::is_blacklisted (hb_blob_t *blob HB_UNUSED, - hb_face_t *face) const -{ - /* Mac OS X prefers morx over GSUB. It also ships with various Indic fonts, - * all by 'MUTF' foundry (Tamil MN, Tamil Sangam MN, etc.), that have broken - * GSUB/GPOS tables. Some have GSUB with zero scripts, those are ignored by - * our morx/GSUB preference code. But if GSUB has non-zero scripts, we tend - * to prefer it over morx because we want to be consistent with other OpenType - * shapers. - * - * To work around broken Indic Mac system fonts, we ignore GSUB table if - * OS/2 VendorId is 'MUTF' and font has morx table as well. - * - * https://github.com/harfbuzz/harfbuzz/issues/1410 - * https://github.com/harfbuzz/harfbuzz/issues/1348 - * https://github.com/harfbuzz/harfbuzz/issues/1391 - */ - if (unlikely (face->table.OS2->achVendID == HB_TAG ('M','U','T','F') && - face->table.morx->has_data ())) - return true; - - return false; -} - -bool -OT::GPOS::is_blacklisted (hb_blob_t *blob HB_UNUSED, - hb_face_t *face HB_UNUSED) const -{ - 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); - } -} - - -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_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) -{ - 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; -} - -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, - hb_tag_t *chosen_script) -{ - 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); -} - -/** - * hb_ot_layout_table_select_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; -} - -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); -} - -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) -{ - 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; -} - - -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); -} - -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); -} - -/** - * hb_ot_layout_script_select_language: - * - * 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_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) -{ - 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: - * - * 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, - hb_tag_t *feature_tag) -{ - 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 (); -} - -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); -} - -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_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) -{ - 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: - * - * 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: - * - * 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) {} - - 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); - } - - private: - template - bool visited (const T &p, hb_set_t &visited_set) - { - hb_codepoint_t delta = (hb_codepoint_t) ((uintptr_t) &p - (uintptr_t) &g); - if (visited_set.has (delta)) - return true; - - visited_set.add (delta); - return false; - } - - public: - const OT::GSUBGPOS &g; - hb_set_t *feature_indexes; - - private: - hb_set_t visited_script; - hb_set_t visited_langsys; - unsigned int script_count; - unsigned int langsys_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->feature_indexes->add (l.get_required_feature_index ()); - - 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: - * - * 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: - * - * 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); -} - -/** - * hb_ot_layout_lookup_collect_glyphs: - * - * 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; - } - } -} - - -/* Variations support */ - -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); -} - -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_bool_t -hb_ot_layout_has_substitution (hb_face_t *face) -{ - return face->table.GSUB->table->has_data (); -} - -/** - * hb_ot_layout_lookup_would_substitute: - * - * 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) -{ - return hb_ot_layout_lookup_would_substitute_fast (face, - lookup_index, - glyphs, glyphs_length, - zero_context); -} - -bool -hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face, - unsigned int lookup_index, - const hb_codepoint_t *glyphs, - unsigned int glyphs_length, - bool 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]); -} - -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: - * - * Since: 0.9.7 - **/ -void -hb_ot_layout_lookup_substitute_closure (hb_face_t *face, - unsigned int lookup_index, - hb_set_t *glyphs) -{ - 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: - * - * 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) -{ - 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 != nullptr) - { - 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_bool_t -hb_ot_layout_has_positioning (hb_face_t *face) -{ - return face->table.GPOS->table->has_data (); -} - -void -hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer) -{ - OT::GPOS::position_start (font, buffer); -} - -void -hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer) -{ - OT::GPOS::position_finish_advances (font, buffer); -} - -void -hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer) -{ - OT::GPOS::position_finish_offsets (font, buffer); -} - -/** - * hb_ot_layout_get_size_params: - * - * 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: In case the resulting char_count was equal to its input value, there - * is a chance there were more characters on the tag so this API can be - * called with an offset till resulting char_count gets to a number - * lower than input buffer (or consider using just a bigger buffer for - * one shot copying). - * @char_count: (inout) (allow-none): The count of characters for which this feature - * provides glyph variants. (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 characters listed by designer under feature parameters for "Character - * Variant" ("cvXX") features. - * - * 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); - - 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 (); - - const OT::FeatureParamsCharacterVariants& cv_params = - feature_params.get_character_variants_params(feature_tag); - - unsigned int len = 0; - if (char_count && characters && start_offset < cv_params.characters.len) - { - len = MIN (cv_params.characters.len - start_offset, *char_count); - for (unsigned int i = 0; i < len; ++i) - characters[i] = cv_params.characters[start_offset + i]; - } - if (char_count) *char_count = len; - return cv_params.characters.len; -} - - -/* - * 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 -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 -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 (&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); - apply (proxy, plan, font, buffer); -} - -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); - apply (proxy, plan, font, buffer); -} - -void -hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c, - const OT::SubstLookup &lookup, - const OT::hb_ot_layout_lookup_accelerator_t &accel) -{ - apply_string (c, lookup, accel); -} - -#if 0 -static const OT::BASE& _get_base (hb_face_t *face) -{ - return *face->table.BASE; -} - -hb_bool_t -hb_ot_layout_get_baseline (hb_font_t *font, - hb_ot_layout_baseline_t baseline, - hb_direction_t direction, - hb_tag_t script_tag, - hb_tag_t language_tag, - hb_position_t *coord /* OUT. May be NULL. */) -{ - const OT::BASE &base = _get_base (font->face); - bool result = base.get_baseline (font, baseline, direction, script_tag, - language_tag, coord); - - /* TODO: Simulate https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags#ideographic-em-box */ - if (!result && coord) *coord = 0; - - if (coord) *coord = font->em_scale_dir (*coord, direction); - - return result; -} - -/* To be moved to public header */ -/* - * BASE - */ - -/** - * hb_ot_layout_baseline_t: - * - * https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags - * - * Since: DONTREPLACEME - */ -typedef enum { - HB_OT_LAYOUT_BASELINE_HANG = HB_TAG('h','a','n','g'), - HB_OT_LAYOUT_BASELINE_ICFB = HB_TAG('i','c','f','b'), - HB_OT_LAYOUT_BASELINE_ICFT = HB_TAG('i','c','f','t'), - HB_OT_LAYOUT_BASELINE_IDEO = HB_TAG('i','d','e','o'), - HB_OT_LAYOUT_BASELINE_IDTB = HB_TAG('i','d','t','b'), - HB_OT_LAYOUT_BASELINE_MATH = HB_TAG('m','a','t','h'), - HB_OT_LAYOUT_BASELINE_ROMN = HB_TAG('r','o','m','n') -} hb_ot_layout_baseline_t; - -HB_EXTERN hb_bool_t -hb_ot_layout_get_baseline (hb_font_t *font, - hb_ot_layout_baseline_t baseline, - hb_direction_t direction, - hb_tag_t script_tag, - hb_tag_t language_tag, - hb_position_t *coord /* OUT. May be NULL. */); - -#endif --- /dev/null 2020-01-23 11:31:37.155195123 -0800 +++ new/src/java.desktop/share/native/libharfbuzz/hb-ot-layout.cc 2020-07-21 14:25:42.818861637 -0700 @@ -0,0 +1,1531 @@ +/* + * 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-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-gasp-table.hh" // Just so we compile it; unused otherwise. +#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-lcar-table.hh" +#include "hb-aat-layout-morx-table.hh" + + +/** + * 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 + */ + +bool +hb_ot_layout_has_kerning (hb_face_t *face) +{ + return face->table.kern->has_data (); +} + +bool +hb_ot_layout_has_machine_kerning (hb_face_t *face) +{ + return face->table.kern->has_state_machine (); +} + +bool +hb_ot_layout_has_cross_kerning (hb_face_t *face) +{ + return face->table.kern->has_cross_stream (); +} + +void +hb_ot_layout_kern (const hb_ot_shape_plan_t *plan, + hb_font_t *font, + hb_buffer_t *buffer) +{ + hb_blob_t *blob = font->face->table.kern.get_blob (); + const AAT::kern& kern = *blob->as (); + + AAT::hb_aat_apply_context_t c (plan, font, buffer, blob); + + kern.apply (&c); +} + + +/* + * GDEF + */ + +bool +OT::GDEF::is_blacklisted (hb_blob_t *blob, + hb_face_t *face) const +{ + /* The ugly business of blacklisting 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 + */ +#define ENCODE(x,y,z) (((uint64_t) (x) << 48) | ((uint64_t) (y) << 24) | (uint64_t) (z)) + switch ENCODE(blob->length, + face->table.GSUB->table.get_length (), + face->table.GPOS->table.get_length ()) + { + /* sha1sum:c5ee92f0bca4bfb7d06c4d03e8cf9f9cf75d2e8a Windows 7? timesi.ttf */ + case ENCODE (442, 2874, 42038): + /* sha1sum:37fc8c16a0894ab7b749e35579856c73c840867b Windows 7? timesbi.ttf */ + case ENCODE (430, 2874, 40662): + /* sha1sum:19fc45110ea6cd3cdd0a5faca256a3797a069a80 Windows 7 timesi.ttf */ + case ENCODE (442, 2874, 39116): + /* sha1sum:6d2d3c9ed5b7de87bc84eae0df95ee5232ecde26 Windows 7 timesbi.ttf */ + case ENCODE (430, 2874, 39374): + /* sha1sum:8583225a8b49667c077b3525333f84af08c6bcd8 OS X 10.11.3 Times New Roman Italic.ttf */ + case ENCODE (490, 3046, 41638): + /* sha1sum:ec0f5a8751845355b7c3271d11f9918a966cb8c9 OS X 10.11.3 Times New Roman Bold Italic.ttf */ + case ENCODE (478, 3046, 41902): + /* sha1sum:96eda93f7d33e79962451c6c39a6b51ee893ce8c tahoma.ttf from Windows 8 */ + case ENCODE (898, 12554, 46470): + /* sha1sum:20928dc06014e0cd120b6fc942d0c3b1a46ac2bc tahomabd.ttf from Windows 8 */ + case ENCODE (910, 12566, 47732): + /* sha1sum:4f95b7e4878f60fa3a39ca269618dfde9721a79e tahoma.ttf from Windows 8.1 */ + case ENCODE (928, 23298, 59332): + /* sha1sum:6d400781948517c3c0441ba42acb309584b73033 tahomabd.ttf from Windows 8.1 */ + case ENCODE (940, 23310, 60732): + /* tahoma.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ + case ENCODE (964, 23836, 60072): + /* tahomabd.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ + case ENCODE (976, 23832, 61456): + /* sha1sum:e55fa2dfe957a9f7ec26be516a0e30b0c925f846 tahoma.ttf from Windows 10 */ + case ENCODE (994, 24474, 60336): + /* sha1sum:7199385abb4c2cc81c83a151a7599b6368e92343 tahomabd.ttf from Windows 10 */ + case ENCODE (1006, 24470, 61740): + /* tahoma.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ + case ENCODE (1006, 24576, 61346): + /* tahomabd.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */ + case ENCODE (1018, 24572, 62828): + /* sha1sum:b9c84d820c49850d3d27ec498be93955b82772b5 tahoma.ttf from Windows 10 AU */ + case ENCODE (1006, 24576, 61352): + /* sha1sum:2bdfaab28174bdadd2f3d4200a30a7ae31db79d2 tahomabd.ttf from Windows 10 AU */ + case ENCODE (1018, 24572, 62834): + /* sha1sum:b0d36cf5a2fbe746a3dd277bffc6756a820807a7 Tahoma.ttf from Mac OS X 10.9 */ + case ENCODE (832, 7324, 47162): + /* sha1sum:12fc4538e84d461771b30c18b5eb6bd434e30fba Tahoma Bold.ttf from Mac OS X 10.9 */ + case ENCODE (844, 7302, 45474): + /* sha1sum:eb8afadd28e9cf963e886b23a30b44ab4fd83acc himalaya.ttf from Windows 7 */ + case ENCODE (180, 13054, 7254): + /* sha1sum:73da7f025b238a3f737aa1fde22577a6370f77b0 himalaya.ttf from Windows 8 */ + case ENCODE (192, 12638, 7254): + /* sha1sum:6e80fd1c0b059bbee49272401583160dc1e6a427 himalaya.ttf from Windows 8.1 */ + case ENCODE (192, 12690, 7254): + /* 8d9267aea9cd2c852ecfb9f12a6e834bfaeafe44 cantarell-fonts-0.0.21/otf/Cantarell-Regular.otf */ + /* 983988ff7b47439ab79aeaf9a45bd4a2c5b9d371 cantarell-fonts-0.0.21/otf/Cantarell-Oblique.otf */ + case ENCODE (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 ENCODE (188, 264, 3426): + /* d125afa82a77a6475ac0e74e7c207914af84b37a padauk-2.80/Padauk.ttf RHEL 7.2 */ + case ENCODE (1058, 47032, 11818): + /* 0f7b80437227b90a577cc078c0216160ae61b031 padauk-2.80/Padauk-Bold.ttf RHEL 7.2*/ + case ENCODE (1046, 47030, 12600): + /* d3dde9aa0a6b7f8f6a89ef1002e9aaa11b882290 padauk-2.80/Padauk.ttf Ubuntu 16.04 */ + case ENCODE (1058, 71796, 16770): + /* 5f3c98ccccae8a953be2d122c1b3a77fd805093f padauk-2.80/Padauk-Bold.ttf Ubuntu 16.04 */ + case ENCODE (1046, 71790, 17862): + /* 6c93b63b64e8b2c93f5e824e78caca555dc887c7 padauk-2.80/Padauk-book.ttf */ + case ENCODE (1046, 71788, 17112): + /* d89b1664058359b8ec82e35d3531931125991fb9 padauk-2.80/Padauk-bookbold.ttf */ + case ENCODE (1058, 71794, 17514): + /* 824cfd193aaf6234b2b4dc0cf3c6ef576c0d00ef padauk-3.0/Padauk-book.ttf */ + case ENCODE (1330, 109904, 57938): + /* 91fcc10cf15e012d27571e075b3b4dfe31754a8a padauk-3.0/Padauk-bookbold.ttf */ + case ENCODE (1330, 109904, 58972): + /* sha1sum: c26e41d567ed821bed997e937bc0c41435689e85 Padauk.ttf + * "Padauk Regular" "Version 2.5", see https://crbug.com/681813 */ + case ENCODE (1004, 59092, 14836): + return true; +#undef ENCODE + } + 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_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: + * + * 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: + * + * 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); +} + +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); +} + +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 */) +{ + unsigned int result_caret_count = 0; + unsigned int result = font->face->table.GDEF->table->get_lig_carets (font, direction, glyph, start_offset, &result_caret_count, caret_array); + if (result) + { + if (caret_count) *caret_count = result_caret_count; + } + else + result = font->face->table.lcar->get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array); + return result; +} + + +/* + * GSUB/GPOS + */ + +bool +OT::GSUB::is_blacklisted (hb_blob_t *blob HB_UNUSED, + hb_face_t *face) const +{ + /* Mac OS X prefers morx over GSUB. It also ships with various Indic fonts, + * all by 'MUTF' foundry (Tamil MN, Tamil Sangam MN, etc.), that have broken + * GSUB/GPOS tables. Some have GSUB with zero scripts, those are ignored by + * our morx/GSUB preference code. But if GSUB has non-zero scripts, we tend + * to prefer it over morx because we want to be consistent with other OpenType + * shapers. + * + * To work around broken Indic Mac system fonts, we ignore GSUB table if + * OS/2 VendorId is 'MUTF' and font has morx table as well. + * + * https://github.com/harfbuzz/harfbuzz/issues/1410 + * https://github.com/harfbuzz/harfbuzz/issues/1348 + * https://github.com/harfbuzz/harfbuzz/issues/1391 + */ + if (unlikely (face->table.OS2->achVendID == HB_TAG ('M','U','T','F') && + face->table.morx->has_data ())) + return true; + + return false; +} + +bool +OT::GPOS::is_blacklisted (hb_blob_t *blob HB_UNUSED, + hb_face_t *face HB_UNUSED) const +{ + 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); + } +} + + +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_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) +{ + 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; +} + +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, + hb_tag_t *chosen_script) +{ + 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); +} + +/** + * hb_ot_layout_table_select_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; +} + +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); +} + +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) +{ + 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; +} + + +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); +} + +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); +} + +/** + * hb_ot_layout_script_select_language: + * + * 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_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) +{ + 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: + * + * 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, + hb_tag_t *feature_tag) +{ + 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 (); +} + +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); +} + +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_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) +{ + 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: + * + * 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: + * + * 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) {} + + 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); + } + + private: + template + bool visited (const T &p, hb_set_t &visited_set) + { + hb_codepoint_t delta = (hb_codepoint_t) ((uintptr_t) &p - (uintptr_t) &g); + if (visited_set.has (delta)) + return true; + + visited_set.add (delta); + return false; + } + + public: + const OT::GSUBGPOS &g; + hb_set_t *feature_indexes; + + private: + hb_set_t visited_script; + hb_set_t visited_langsys; + unsigned int script_count; + unsigned int langsys_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->feature_indexes->add (l.get_required_feature_index ()); + + 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: + * + * 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: + * + * 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); +} + +/** + * hb_ot_layout_lookup_collect_glyphs: + * + * 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; + } + } +} + + +/* Variations support */ + +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); +} + +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_bool_t +hb_ot_layout_has_substitution (hb_face_t *face) +{ + return face->table.GSUB->table->has_data (); +} + +/** + * hb_ot_layout_lookup_would_substitute: + * + * 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) +{ + return hb_ot_layout_lookup_would_substitute_fast (face, + lookup_index, + glyphs, glyphs_length, + zero_context); +} + +bool +hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face, + unsigned int lookup_index, + const hb_codepoint_t *glyphs, + unsigned int glyphs_length, + bool 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]); +} + +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: + * + * Since: 0.9.7 + **/ +void +hb_ot_layout_lookup_substitute_closure (hb_face_t *face, + unsigned int lookup_index, + hb_set_t *glyphs) +{ + 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: + * + * 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) +{ + 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 != nullptr) + { + 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_bool_t +hb_ot_layout_has_positioning (hb_face_t *face) +{ + return face->table.GPOS->table->has_data (); +} + +void +hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer) +{ + OT::GPOS::position_start (font, buffer); +} + +void +hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer) +{ + OT::GPOS::position_finish_advances (font, buffer); +} + +void +hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer) +{ + OT::GPOS::position_finish_offsets (font, buffer); +} + +/** + * hb_ot_layout_get_size_params: + * + * 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: In case the resulting char_count was equal to its input value, there + * is a chance there were more characters on the tag so this API can be + * called with an offset till resulting char_count gets to a number + * lower than input buffer (or consider using just a bigger buffer for + * one shot copying). + * @char_count: (inout) (allow-none): The count of characters for which this feature + * provides glyph variants. (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 characters listed by designer under feature parameters for "Character + * Variant" ("cvXX") features. + * + * 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); + + 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 (); + + const OT::FeatureParamsCharacterVariants& cv_params = + feature_params.get_character_variants_params(feature_tag); + + unsigned int len = 0; + if (char_count && characters && start_offset < cv_params.characters.len) + { + len = MIN (cv_params.characters.len - start_offset, *char_count); + for (unsigned int i = 0; i < len; ++i) + characters[i] = cv_params.characters[start_offset + i]; + } + if (char_count) *char_count = len; + return cv_params.characters.len; +} + + +/* + * 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 +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 +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 (&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); + apply (proxy, plan, font, buffer); +} + +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); + apply (proxy, plan, font, buffer); +} + +void +hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c, + const OT::SubstLookup &lookup, + const OT::hb_ot_layout_lookup_accelerator_t &accel) +{ + apply_string (c, lookup, accel); +} + +#if 0 +static const OT::BASE& _get_base (hb_face_t *face) +{ + return *face->table.BASE; +} + +hb_bool_t +hb_ot_layout_get_baseline (hb_font_t *font, + hb_ot_layout_baseline_t baseline, + hb_direction_t direction, + hb_tag_t script_tag, + hb_tag_t language_tag, + hb_position_t *coord /* OUT. May be NULL. */) +{ + const OT::BASE &base = _get_base (font->face); + bool result = base.get_baseline (font, baseline, direction, script_tag, + language_tag, coord); + + /* TODO: Simulate https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags#ideographic-em-box */ + if (!result && coord) *coord = 0; + + if (coord) *coord = font->em_scale_dir (*coord, direction); + + return result; +} + +/* To be moved to public header */ +/* + * BASE + */ + +/** + * hb_ot_layout_baseline_t: + * + * https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags + * + * Since: DONTREPLACEME + */ +typedef enum { + HB_OT_LAYOUT_BASELINE_HANG = HB_TAG('h','a','n','g'), + HB_OT_LAYOUT_BASELINE_ICFB = HB_TAG('i','c','f','b'), + HB_OT_LAYOUT_BASELINE_ICFT = HB_TAG('i','c','f','t'), + HB_OT_LAYOUT_BASELINE_IDEO = HB_TAG('i','d','e','o'), + HB_OT_LAYOUT_BASELINE_IDTB = HB_TAG('i','d','t','b'), + HB_OT_LAYOUT_BASELINE_MATH = HB_TAG('m','a','t','h'), + HB_OT_LAYOUT_BASELINE_ROMN = HB_TAG('r','o','m','n') +} hb_ot_layout_baseline_t; + +HB_EXTERN hb_bool_t +hb_ot_layout_get_baseline (hb_font_t *font, + hb_ot_layout_baseline_t baseline, + hb_direction_t direction, + hb_tag_t script_tag, + hb_tag_t language_tag, + hb_position_t *coord /* OUT. May be NULL. */); + +#endif