hb-ot-shape-complex-indic.cc revision df6d45c693c417bf311e6fa49f18a8558542e525
1b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod/* 220503ccd578c9983162857954e3236413469ed35Behdad Esfahbod * Copyright © 2011 Google, Inc. 3b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * 4b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * This is part of HarfBuzz, a text shaping library. 5b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * 6b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * Permission is hereby granted, without written agreement and without 7b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * license or royalty fees, to use, copy, modify, and distribute this 8b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * software and its documentation for any purpose, provided that the 9b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * above copyright notice and the following two paragraphs appear in 10b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * all copies of this software. 11b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * 12b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * DAMAGE. 17b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * 18b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * 24b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod * Google Author(s): Behdad Esfahbod 25b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod */ 26b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 27b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 283ed4634ec349fa9e943ad23718c04be4dd4bba62Behdad Esfahbod#include "hb-ot-shape-complex-indic-private.hh" 29352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod 30743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic int 31743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodcompare_codepoint (const void *pa, const void *pb) 32743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 33743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_codepoint_t a = * (hb_codepoint_t *) pa; 34743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_codepoint_t b = * (hb_codepoint_t *) pb; 35743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 36743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod return a < b ? -1 : a == b ? 0 : +1; 37743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 38743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 39743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic indic_position_t 40743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodconsonant_position (hb_codepoint_t u) 41743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 42743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod consonant_position_t *record; 43743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 44743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod record = (consonant_position_t *) bsearch (&u, consonant_positions, 45743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod ARRAY_LENGTH (consonant_positions), 46743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod sizeof (consonant_positions[0]), 47743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod compare_codepoint); 48743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 49743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod return record ? record->position : POS_BASE; 50743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 51743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 52352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbodstatic bool 53352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbodis_ra (hb_codepoint_t u) 54352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod{ 55352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod return !!bsearch (&u, ra_chars, 56352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod ARRAY_LENGTH (ra_chars), 57352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod sizeof (ra_chars[0]), 58352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod compare_codepoint); 59352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod} 60352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod 619ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbodstatic bool 629da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodis_joiner (const hb_glyph_info_t &info) 639ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod{ 649da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod return !!(FLAG (info.indic_category()) & (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ))); 659da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod} 669da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 679da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodstatic bool 689da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodis_consonant (const hb_glyph_info_t &info) 699da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod{ 709da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod return !!(FLAG (info.indic_category()) & (FLAG (OT_C) | FLAG (OT_Ra))); 719ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod} 72c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod 73c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbodstatic const struct { 74c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod hb_tag_t tag; 75c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod hb_bool_t is_global; 76c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod} indic_basic_features[] = 77b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 78c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('n','u','k','t'), true}, 79c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('a','k','h','n'), false}, 80c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('r','p','h','f'), false}, 811ac075b227090a9ad930dcc1670236c176b27067Behdad Esfahbod {HB_TAG('r','k','r','f'), true}, 82c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('p','r','e','f'), false}, 83c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('b','l','w','f'), false}, 84c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('h','a','l','f'), false}, 85c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('v','a','t','u'), true}, 86c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('p','s','t','f'), false}, 879da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod {HB_TAG('c','j','c','t'), false}, 88c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod}; 89c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod 90c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod/* Same order as the indic_basic_features array */ 91c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbodenum { 92c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod _NUKT, 93c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod AKHN, 94c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod RPHF, 95df6d45c693c417bf311e6fa49f18a8558542e525Behdad Esfahbod _RKRF, 96c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod PREF, 97c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod BLWF, 98c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod HALF, 99c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod _VATU, 100c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod PSTF, 101e8eedf2687f05372bf5476e84139d01ba67c9f73Behdad Esfahbod CJCT 102b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod}; 103b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 104b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodstatic const hb_tag_t indic_other_features[] = 105b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 106b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod HB_TAG('p','r','e','s'), 107b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod HB_TAG('a','b','v','s'), 108b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod HB_TAG('b','l','w','s'), 109b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod HB_TAG('p','s','t','s'), 110b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod HB_TAG('h','a','l','n'), 111b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 112b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod HB_TAG('d','i','s','t'), 113b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod HB_TAG('a','b','v','m'), 114b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod HB_TAG('b','l','w','m'), 115b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod}; 116b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 117743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 118743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 119743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 120743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_face_t *face, 121743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 122743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 123f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodstatic void 124f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 125f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_face_t *face, 126f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_buffer_t *buffer, 127743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 128b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 129b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 13076f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod_hb_ot_shape_complex_collect_features_indic (hb_ot_map_builder_t *map, const hb_segment_properties_t *props) 131b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 132f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('l','o','c','l')); 133a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod /* The Indic specs do not require ccmp, but we apply it here since if 134a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod * there is a use of it, it's typically at the beginning. */ 135f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('c','c','m','p')); 136f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 137743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod map->add_gsub_pause (initial_reordering, NULL); 138f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 139412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_basic_features); i++) { 14076f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod map->add_bool_feature (indic_basic_features[i].tag, indic_basic_features[i].is_global); 141412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 142412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 143b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 144f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_gsub_pause (final_reordering, NULL); 145f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 146412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_other_features); i++) { 14776f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod map->add_bool_feature (indic_other_features[i], true); 148412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 149412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 150b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 151b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 152867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 15311138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbodhb_ot_shape_normalization_mode_t 15411138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod_hb_ot_shape_complex_normalization_preference_indic (void) 15502cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod{ 15602cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod /* We want split matras decomposed by the common shaping logic. */ 15711138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod return HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED; 15802cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod} 15902cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod 160867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 161b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 162acd88e659fdb2fa1cbf7171f0a1c7fbc81b9f298Behdad Esfahbod_hb_ot_shape_complex_setup_masks_indic (hb_ot_map_t *map, hb_buffer_t *buffer, hb_font_t *font) 163b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 1649f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_category); 1659f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_position); 1669f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod 167743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* We cannot setup masks here. We save information about characters 168743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and setup masks later on in a pause-callback. */ 169743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 170743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int count = buffer->len; 171b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < count; i++) 172b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod { 17376f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod unsigned int type = get_indic_categories (buffer->info[i].codepoint); 174b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 17576f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod buffer->info[i].indic_category() = type & 0x0F; 176a06411ecf93c7e5256e363eef3ef69554896dd55Behdad Esfahbod buffer->info[i].indic_position() = (type >> 4) & 7; 177743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 178352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod if (buffer->info[i].indic_category() == OT_C) { 179743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod buffer->info[i].indic_position() = consonant_position (buffer->info[i].codepoint); 180352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod if (is_ra (buffer->info[i].codepoint)) 181352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod buffer->info[i].indic_category() = OT_Ra; 1829da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } else if (buffer->info[i].codepoint == 0x200C) 1839da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod buffer->info[i].indic_category() = OT_ZWNJ; 1849da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod else if (buffer->info[i].codepoint == 0x200D) 1859da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod buffer->info[i].indic_category() = OT_ZWJ; 186b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod } 187743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 188b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 18945d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodstatic int 19045d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodcompare_indic_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) 19145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod{ 19245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int a = pa->indic_position(); 19345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int b = pb->indic_position(); 19445d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 19545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod return a < b ? -1 : a == b ? 0 : +1; 19645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod} 197867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 198743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 199743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodfound_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 200743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int start, unsigned int end) 201743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 202743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int i; 203ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 204743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 205743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Comments from: 206743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */ 207743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 208743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 1. Find base consonant: 209743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 210743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The shaping engine finds the base consonant of the syllable, using the 211743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following algorithm: starting from the end of the syllable, move backwards 212743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * until a consonant is found that does not have a below-base or post-base 213743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * form (post-base forms have to follow below-base forms), or that is not a 214743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * pre-base reordering Ra, or arrive at the first consonant. The consonant 215743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * stopped at will be the base. 216743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 217743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o If the syllable starts with Ra + Halant (in a script that has Reph) 218743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 219743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * base consonants. 220743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 221743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 2225e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod unsigned int base = end; 223743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 224743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* -> starting from the end of the syllable, move backwards */ 225743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod i = end; 2265e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod unsigned int limit = start; 2275e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod if (info[start].indic_category() == OT_Ra && start + 2 <= end) { 2285e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod limit += 2; 2295e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod base = start; 2305e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod }; 231743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod do { 232743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod i--; 233743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* -> until a consonant is found */ 23497158392a5899ddb739afaac925128f33f699bd7Behdad Esfahbod if (is_consonant (info[i])) 235743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod { 236743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* -> that does not have a below-base or post-base form 237743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * (post-base forms have to follow below-base forms), */ 238ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod if (info[i].indic_position() != POS_BELOW && 239ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod info[i].indic_position() != POS_POST) 240743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod { 241743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod base = i; 242743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod break; 243743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod } 244743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 245cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod /* -> or that is not a pre-base reordering Ra, 246cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod * 247e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * TODO 248e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod */ 249e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 250e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod /* -> o If the syllable starts with Ra + Halant (in a script that has Reph) 251e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 252e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * base consonants. 253cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod * 254cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod * IMPLEMENTATION NOTES: 255cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod * 256cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod * We do this by adjusting limit accordingly before entering the loop. 257cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod */ 258cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod 259cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod /* -> or arrive at the first consonant. The consonant stopped at will 260cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod * be the base. */ 261743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod base = i; 262743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod } 2635e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod else 2645e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod if (is_joiner (info[i])) 2655e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod break; 266cfd4382ec1af91640129551697de36fd42c0849aBehdad Esfahbod } while (i > limit); 267743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod if (base < start) 268743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod base = start; /* Just in case... */ 269743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 270743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 271743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 2. Decompose and reorder Matras: 272743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 273743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Each matra and any syllable modifier sign in the cluster are moved to the 274743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * appropriate position relative to the consonant(s) in the cluster. The 275743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * shaping engine decomposes two- or three-part matras into their constituent 276743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * parts before any repositioning. Matra characters are classified by which 277743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * consonant in a conjunct they have affinity for and are reordered to the 278743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following positions: 279743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 280743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o Before first half form in the syllable 281743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After subjoined consonants 282743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After post-form consonant 283743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After main consonant (for above marks) 284743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 285743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 286743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 287743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The normalize() routine has already decomposed matras for us, so we don't 288743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * need to worry about that. 289743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 290743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 291743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 292743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 3. Reorder marks to canonical order: 293743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 294743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Adjacent nukta and halant or nukta and vedic sign are always repositioned 295743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * if necessary, so that the nukta is first. 296743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 297743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 298743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 299743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * We don't need to do this: the normalize() routine already did this for us. 300743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 301743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 302743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 30345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Reorder characters */ 30445d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 30545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod for (i = start; i < base; i++) 306ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod info[i].indic_position() = POS_PRE; 307ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod info[base].indic_position() = POS_BASE; 30845d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 309fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod 310fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod /* Handle beginning Ra */ 3110d8f8a177c4bfd4dc642a353bab8d03674e839acBehdad Esfahbod if (start + 3 <= end && 312fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod info[start].indic_category() == OT_Ra && 3139ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod info[start + 1].indic_category() == OT_H && 3140d8f8a177c4bfd4dc642a353bab8d03674e839acBehdad Esfahbod !is_joiner (info[start + 2])) 315fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod { 316fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod info[start].indic_position() = POS_POST; 317fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod info[start].mask = mask_array[RPHF]; 318fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod } 319fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod 320f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* For old-style Indic script tags, move the first post-base Halant after 321f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod * last consonant. */ 322f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if ((map->get_chosen_script (0) & 0x000000FF) != '2') { 323f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* We should only do this for Indic scripts which have a version two I guess. */ 324f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod for (i = base + 1; i < end; i++) 325f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (info[i].indic_category() == OT_H) { 326f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod unsigned int j; 327f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod for (j = end - 1; j > i; j--) 328f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if ((FLAG (info[j].indic_category()) & (FLAG (OT_C) | FLAG (OT_Ra)))) 329f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 330f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (j > i) { 331f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* Move Halant to after last consonant. */ 332f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod hb_glyph_info_t t = info[i]; 333f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0])); 334f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod info[j] = t; 335f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 336f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 337f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 338f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 339f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod 34045d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Attach ZWJ, ZWNJ, nukta, and halant to previous char to move with them. */ 34145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod for (i = start + 1; i < end; i++) 342ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod if ((FLAG (info[i].indic_category()) & 34345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) 344ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod info[i].indic_position() = info[i - 1].indic_position(); 34545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 34645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* We do bubble-sort, skip malicious clusters attempts */ 34745d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod if (end - start > 20) 34845d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod return; 34945d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 35045d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Sit tight, rock 'n roll! */ 351ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod hb_bubble_sort (info + start, end - start, compare_indic_order); 35245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 353743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Setup masks now */ 354743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 355281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod { 356281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod hb_mask_t mask; 357281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod 358281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Pre-base */ 359281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod mask = mask_array[HALF] | mask_array[AKHN] | mask_array[CJCT]; 360281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod for (i = start; i < base; i++) 361281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 362281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Base */ 363281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod mask = mask_array[AKHN] | mask_array[CJCT]; 364281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[base].mask |= mask; 365281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Post-base */ 366281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod mask = mask_array[BLWF] | mask_array[PSTF] | mask_array[CJCT]; 367281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod for (i = base + 1; i < end; i++) 368281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 369281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod } 3709da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 3719da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod /* Apply ZWJ/ZWNJ effects */ 3729da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod for (i = start + 1; i < end; i++) 3739da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod if (is_joiner (info[i])) { 3749da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod bool non_joiner = info[i].indic_category() == OT_ZWNJ; 3756b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod unsigned int j = i; 3769da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 3779da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod do { 3789da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod j--; 3796b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 380a91c58bf98258a34e5f7c1ad39a38db58fadc4b9Behdad Esfahbod /* Reading the Unicode and OpenType specs, I think the following line 381a91c58bf98258a34e5f7c1ad39a38db58fadc4b9Behdad Esfahbod * is correct, but this is not what the test suite expects currently. 382a91c58bf98258a34e5f7c1ad39a38db58fadc4b9Behdad Esfahbod * The test suite has been drinking, not me... But disable while 383a91c58bf98258a34e5f7c1ad39a38db58fadc4b9Behdad Esfahbod * investigating. 384a91c58bf98258a34e5f7c1ad39a38db58fadc4b9Behdad Esfahbod */ 385a91c58bf98258a34e5f7c1ad39a38db58fadc4b9Behdad Esfahbod //info[j].mask &= !mask_array[CJCT]; 3866b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod if (non_joiner) 3876b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod info[j].mask &= !mask_array[HALF]; 3886b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 3899da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } while (j > start && !is_consonant (info[j])); 3909da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } 391743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 392743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 393743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 394743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 395743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodfound_vowel_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 396743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int start, unsigned int end) 397743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 398743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* TODO 399743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Not clear to me how this should work. Do the matras move to before the 400743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * independent vowel? No idea. 401743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 402743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 403743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 404743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 405743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodfound_standalone_cluster (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 406743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int start, unsigned int end) 407743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 408743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* TODO 409743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Easiest thing to do here is to convert the NBSP to consonant and 410743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * call found_consonant_syllable. 411743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 412743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 413743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 414743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 415743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodfound_non_indic (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 416743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int start, unsigned int end) 417743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 418743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Nothing to do right now. If we ever switch to using the output 419743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * buffer in the reordering process, we'd need to next_glyph() here. */ 420743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 421743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 422743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod#include "hb-ot-shape-complex-indic-machine.hh" 423743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 424743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 4259da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodremove_joiners (hb_buffer_t *buffer) 4269da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod{ 4270a965eee880428a43ad7f9d1317c344666247dd7Behdad Esfahbod /* For now we remove joiners. However, Uniscbire seems to keep them 4280a965eee880428a43ad7f9d1317c344666247dd7Behdad Esfahbod * and output a zero-width space glyph for them. It is not clear to 4290a965eee880428a43ad7f9d1317c344666247dd7Behdad Esfahbod * me how that is supposed to interact with GSUB. */ 4300a965eee880428a43ad7f9d1317c344666247dd7Behdad Esfahbod 4319da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod buffer->clear_output (); 4329da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod unsigned int count = buffer->len; 4339da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod for (buffer->idx = 0; buffer->idx < count;) 4349da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod if (unlikely (is_joiner (buffer->info[buffer->idx]))) 4359da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod buffer->skip_glyph (); 4369da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod else 4379da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod buffer->next_glyph (); 4389da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 4399da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod buffer->swap_buffers (); 4409da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod} 4419da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 4429da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodstatic void 443743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 444743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_face_t *face, 445743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 446743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED) 447743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 448b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod hb_mask_t mask_array[ARRAY_LENGTH (indic_basic_features)] = {0}; 449b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod unsigned int num_masks = ARRAY_LENGTH (indic_basic_features); 450b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < num_masks; i++) 45176f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod mask_array[i] = map->get_1_mask (indic_basic_features[i].tag); 452743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 453743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod find_syllables (map, buffer, mask_array); 4549da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 4559da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod remove_joiners (buffer); 456b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 457b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 458743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 459743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 460743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_face_t *face, 461743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 462743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED) 463743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 464e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod /* 4. Final reordering: 465e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 466e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * After the localized forms and basic shaping forms GSUB features have been 467e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * applied (see below), the shaping engine performs some final glyph 468e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * reordering before applying all the remaining font features to the entire 469e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * cluster. 470e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 471e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * o Reorder matras: 472e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 473e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base matra character had been reordered before applying basic 474e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * features, the glyph can be moved closer to the main consonant based on 475e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * whether half-forms had been formed. Actual position for the matra is 476e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * defined as “after last standalone halant glyph, after initial matra 477e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * position and before the main consonant”. If ZWJ or ZWNJ follow this 478e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * halant, position is moved after it. 479e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 480e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * o Reorder reph: 481e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 482e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Reph’s original position is always at the beginning of the syllable, 483e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * (i.e. it is not reordered at the character reordering stage). However, 484e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * it will be reordered according to the basic-forms shaping results. 485e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Possible positions for reph, depending on the script, are; after main, 486e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * before post-base consonant forms, and after post-base consonant forms. 487e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 488e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 1. If reph should be positioned after post-base consonant forms, 489e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * proceed to step 5. 490e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 491e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 2. If the reph repositioning class is not after post-base: target 492e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * position is after the first explicit halant glyph between the 493e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * first post-reph consonant and last main consonant. If ZWJ or ZWNJ 494e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * are following this halant, position is moved after it. If such 495e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * position is found, this is the target position. Otherwise, 496e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * proceed to the next step. 497e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 498e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Note: in old-implementation fonts, where classifications were 499e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * fixed in shaping engine, there was no case where reph position 500e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * will be found on this step. 501e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 502e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 3. If reph should be repositioned after the main consonant: from the 503e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * first consonant not ligated with main, or find the first 504e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * consonant that is not a potential pre-base reordering Ra. 505e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 506e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 507e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 4. If reph should be positioned before post-base consonant, find 508e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * first post-base classified consonant not ligated with main. If no 509e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * consonant is found, the target position should be before the 510e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * first matra, syllable modifier sign or vedic sign. 511e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 512e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 5. If no consonant is found in steps 3 or 4, move reph to a position 513e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * immediately before the first post-base matra, syllable modifier 514e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * sign or vedic sign that has a reordering class after the intended 515e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * reph position. For example, if the reordering position for reph 516e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * is post-main, it will skip above-base matras that also have a 517e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * post-main position. 518e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 519e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 6. Otherwise, reorder reph to the end of the syllable. 520e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 521e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * o Reorder pre-base reordering consonants: 522e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 523e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base reordering consonant is found, reorder it according to 524e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * the following rules: 525e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 526e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 1. Only reorder a glyph produced by substitution during application 527e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * of the feature. (Note that a font may shape a Ra consonant with 528e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * the feature generally but block it in certain contexts.) 529e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 530e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 2. Try to find a target position the same way as for pre-base matra. 531e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If it is found, reorder pre-base consonant glyph. 532e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 533e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 3. If position is not found, reorder immediately before main 534e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * consonant. 535e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod */ 536e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 537e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod /* TODO */ 538e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 539e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 540e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 541743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); 542743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); 543743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 544743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 545743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 546b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 547