hb-ot-shape-complex-indic.cc revision eed903b1644e087178438959664a6a57bebc398b
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 273ed4634ec349fa9e943ad23718c04be4dd4bba62Behdad Esfahbod#include "hb-ot-shape-complex-indic-private.hh" 28352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod 29ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbodstatic const struct indic_options_t 30ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod{ 31ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod indic_options_t (void) 32ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 33ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod char *c = getenv ("HB_OT_INDIC_OPTIONS"); 34ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod uniscribe_bug_compatible = c && strstr (c, "uniscribe-bug-compatible"); 35ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 36ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod 37ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod bool uniscribe_bug_compatible; 38ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod} options; 39ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod 40743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic int 41743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodcompare_codepoint (const void *pa, const void *pb) 42743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 43743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_codepoint_t a = * (hb_codepoint_t *) pa; 44743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_codepoint_t b = * (hb_codepoint_t *) pb; 45743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 46743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod return a < b ? -1 : a == b ? 0 : +1; 47743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 48743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 49743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic indic_position_t 50743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodconsonant_position (hb_codepoint_t u) 51743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 52743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod consonant_position_t *record; 53743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 54743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod record = (consonant_position_t *) bsearch (&u, consonant_positions, 55743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod ARRAY_LENGTH (consonant_positions), 56743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod sizeof (consonant_positions[0]), 57743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod compare_codepoint); 58743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 59dbccf87eef0d26838fa4bb3ae26410f6c4818836Behdad Esfahbod return record ? record->position : POS_BASE_C; 60743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 61743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 62352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbodstatic bool 63352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbodis_ra (hb_codepoint_t u) 64352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod{ 65352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod return !!bsearch (&u, ra_chars, 66352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod ARRAY_LENGTH (ra_chars), 67352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod sizeof (ra_chars[0]), 68352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod compare_codepoint); 69352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod} 70352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod 719ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbodstatic bool 729da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodis_joiner (const hb_glyph_info_t &info) 739ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod{ 749da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod return !!(FLAG (info.indic_category()) & (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ))); 759da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod} 769da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 779da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodstatic bool 789da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodis_consonant (const hb_glyph_info_t &info) 799da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod{ 801a1fa8c655a082fc1439608457ba717306cc83caBehdad Esfahbod /* Note: 811a1fa8c655a082fc1439608457ba717306cc83caBehdad Esfahbod * 8218c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * We treat Vowels and placeholders as if they were consonants. This is safe because Vowels 83c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod * cannot happen in a consonant syllable. The plus side however is, we can call the 84c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod * consonant syllable logic from the vowel syllable function and get it all right! */ 8518c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod return !!(FLAG (info.indic_category()) & (FLAG (OT_C) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_DOTTEDCIRCLE))); 869ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod} 87c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod 88eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstruct feature_list_t { 89c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod hb_tag_t tag; 90c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod hb_bool_t is_global; 91eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod}; 92eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 93eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstatic const feature_list_t 94eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodindic_basic_features[] = 95b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 96c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('n','u','k','t'), true}, 97c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('a','k','h','n'), false}, 98c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('r','p','h','f'), false}, 991ac075b227090a9ad930dcc1670236c176b27067Behdad Esfahbod {HB_TAG('r','k','r','f'), true}, 100c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('p','r','e','f'), false}, 101c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('b','l','w','f'), false}, 102c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('h','a','l','f'), false}, 103c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('v','a','t','u'), true}, 104c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('p','s','t','f'), false}, 1059da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod {HB_TAG('c','j','c','t'), false}, 106c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod}; 107c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod 108c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod/* Same order as the indic_basic_features array */ 109c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbodenum { 110c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod _NUKT, 111c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod AKHN, 112c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod RPHF, 113df6d45c693c417bf311e6fa49f18a8558542e525Behdad Esfahbod _RKRF, 114c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod PREF, 115c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod BLWF, 116c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod HALF, 117c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod _VATU, 118c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod PSTF, 119e8eedf2687f05372bf5476e84139d01ba67c9f73Behdad Esfahbod CJCT 120b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod}; 121b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 122eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstatic const feature_list_t 123eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodindic_other_features[] = 124b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 125eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('i','n','i','t'), false}, 126eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('p','r','e','s'), true}, 127eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('a','b','v','s'), true}, 128eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('b','l','w','s'), true}, 129eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('p','s','t','s'), true}, 130eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('h','a','l','n'), true}, 131eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 132eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('d','i','s','t'), true}, 133eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('a','b','v','m'), true}, 134eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('b','l','w','m'), true}, 135eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod}; 136eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 137eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod/* Same order as the indic_other_features array */ 138eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodenum { 139eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod INIT 140b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod}; 141b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 142743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 143743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 144743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 145743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_face_t *face, 146743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 147743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 148f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodstatic void 149f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 150f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_face_t *face, 151f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_buffer_t *buffer, 152743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 153b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 154b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 15576f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod_hb_ot_shape_complex_collect_features_indic (hb_ot_map_builder_t *map, const hb_segment_properties_t *props) 156b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 157f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('l','o','c','l')); 158a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod /* The Indic specs do not require ccmp, but we apply it here since if 159a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod * there is a use of it, it's typically at the beginning. */ 160f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('c','c','m','p')); 161f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 162743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod map->add_gsub_pause (initial_reordering, NULL); 163f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 164412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_basic_features); i++) { 16576f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod map->add_bool_feature (indic_basic_features[i].tag, indic_basic_features[i].is_global); 166412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 167412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 168b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 169f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_gsub_pause (final_reordering, NULL); 170f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 171412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_other_features); i++) { 172eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod map->add_bool_feature (indic_other_features[i].tag, indic_other_features[i].is_global); 173412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 174412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 175b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 176b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 177867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 17811138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbodhb_ot_shape_normalization_mode_t 17911138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod_hb_ot_shape_complex_normalization_preference_indic (void) 18002cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod{ 18102cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod /* We want split matras decomposed by the common shaping logic. */ 18211138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod return HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED; 18302cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod} 18402cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod 185867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 186b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 187acd88e659fdb2fa1cbf7171f0a1c7fbc81b9f298Behdad Esfahbod_hb_ot_shape_complex_setup_masks_indic (hb_ot_map_t *map, hb_buffer_t *buffer, hb_font_t *font) 188b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 1899f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_category); 1909f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_position); 1919f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod 192743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* We cannot setup masks here. We save information about characters 193743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and setup masks later on in a pause-callback. */ 194743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 195743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int count = buffer->len; 196b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < count; i++) 197b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod { 19892332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod hb_glyph_info_t &info = buffer->info[i]; 19992332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod unsigned int type = get_indic_categories (info.codepoint); 20092332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod 20192332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = type & 0x0F; 20292332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = type >> 4; 20392332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod 2043399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod /* The spec says U+0952 is OT_A. However, testing shows that Uniscribe 2053399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * treats U+0951..U+0952 all as OT_VD. 2063399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * TESTS: 2073399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0947,U+0952 2083399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0952,U+0947 2093399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0947,U+0951 2103399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0951,U+0947 2113399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * */ 2123399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod if (unlikely (hb_in_range<hb_codepoint_t> (info.codepoint, 0x0951, 0x0954))) 2133399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod info.indic_category() = OT_VD; 2143399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod 21592332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod if (info.indic_category() == OT_C) { 21692332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = consonant_position (info.codepoint); 21792332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod if (is_ra (info.codepoint)) 21892332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_Ra; 21992332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod } else if (info.indic_category() == OT_SM || 22092332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() == OT_VD) { 22192332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = POS_SMVD; 22292332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod } else if (unlikely (info.codepoint == 0x200C)) 22392332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_ZWNJ; 22492332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod else if (unlikely (info.codepoint == 0x200D)) 22592332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_ZWJ; 22618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod else if (unlikely (info.codepoint == 0x25CC)) 22718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod info.indic_category() = OT_DOTTEDCIRCLE; 228b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod } 229743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 230b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 23145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodstatic int 23245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodcompare_indic_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) 23345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod{ 23445d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int a = pa->indic_position(); 23545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int b = pb->indic_position(); 23645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 23745d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod return a < b ? -1 : a == b ? 0 : +1; 23845d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod} 239867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 2407ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod/* Rules from: 2417ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */ 2427ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod 243743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 2440831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbodinitial_reordering_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 2450831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod unsigned int start, unsigned int end, unsigned int base); 2460831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod 2470831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbodstatic void 248ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodinitial_reordering_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 249ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 250743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 251ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 252743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 253743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 1. Find base consonant: 254743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 255743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The shaping engine finds the base consonant of the syllable, using the 256743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following algorithm: starting from the end of the syllable, move backwards 257743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * until a consonant is found that does not have a below-base or post-base 258743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * form (post-base forms have to follow below-base forms), or that is not a 259743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * pre-base reordering Ra, or arrive at the first consonant. The consonant 260743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * stopped at will be the base. 261743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 262743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o If the syllable starts with Ra + Halant (in a script that has Reph) 263743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 264743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * base consonants. 265743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 266743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 2675e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod unsigned int base = end; 26876b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod bool has_reph = false; 269743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 27076b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 27176b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 27276b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod * base consonants. */ 2735e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod unsigned int limit = start; 27476b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod if (mask_array[RPHF] && 2756d8e0cb74c02f6bc09cd4abe9e4bc82062e1b517Behdad Esfahbod start + 3 <= end && 27676b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod info[start].indic_category() == OT_Ra && 2776d8e0cb74c02f6bc09cd4abe9e4bc82062e1b517Behdad Esfahbod info[start + 1].indic_category() == OT_H && 2786d8e0cb74c02f6bc09cd4abe9e4bc82062e1b517Behdad Esfahbod !is_joiner (info[start + 2])) 27976b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod { 2805e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod limit += 2; 2815e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod base = start; 28276b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod has_reph = true; 2835e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod }; 28476b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod 2853c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod { 2863c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> starting from the end of the syllable, move backwards */ 2873c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod unsigned int i = end; 2883c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod do { 2893c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod i--; 2903c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> until a consonant is found */ 2913c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (is_consonant (info[i])) 292743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod { 2933c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> that does not have a below-base or post-base form 2943c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * (post-base forms have to follow below-base forms), */ 2953c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (info[i].indic_position() != POS_BELOW_C && 2963c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod info[i].indic_position() != POS_POST_C) 2973c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod { 2983c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = i; 2993c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod break; 3003c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } 301743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 3023c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> or that is not a pre-base reordering Ra, 3033c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * 3043c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * TODO 3053c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod */ 306e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 3073c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> or arrive at the first consonant. The consonant stopped at will 3083c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * be the base. */ 3093c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = i; 3103c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } 3113c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod else 3123c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (is_joiner (info[i])) 3133c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod break; 3143c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } while (i > limit); 3153c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (base < start) 3163c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = start; /* Just in case... */ 3173c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } 318743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 3190831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod /* Continue reading below ------v */ 3200831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod initial_reordering_syllable (map, buffer, mask_array, start, end, base); 3210831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod} 3223d25079f8d6be81b9b4b91d3a97016b8a572f571Behdad Esfahbod 3230831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbodstatic void 3240831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbodinitial_reordering_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 3250831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod unsigned int start, unsigned int end, unsigned int base) 3260831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod{ 3270831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod hb_glyph_info_t *info = buffer->info; 3283d25079f8d6be81b9b4b91d3a97016b8a572f571Behdad Esfahbod 329743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 2. Decompose and reorder Matras: 330743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 331743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Each matra and any syllable modifier sign in the cluster are moved to the 332743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * appropriate position relative to the consonant(s) in the cluster. The 333743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * shaping engine decomposes two- or three-part matras into their constituent 334743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * parts before any repositioning. Matra characters are classified by which 335743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * consonant in a conjunct they have affinity for and are reordered to the 336743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following positions: 337743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 338743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o Before first half form in the syllable 339743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After subjoined consonants 340743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After post-form consonant 341743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After main consonant (for above marks) 342743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 343743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 344743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 345743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The normalize() routine has already decomposed matras for us, so we don't 346743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * need to worry about that. 347743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 348743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 349743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 350743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 3. Reorder marks to canonical order: 351743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 352743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Adjacent nukta and halant or nukta and vedic sign are always repositioned 353743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * if necessary, so that the nukta is first. 354743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 355743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 356743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 357743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * We don't need to do this: the normalize() routine already did this for us. 358743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 359743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 360743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 36145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Reorder characters */ 36245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 3633c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < base; i++) 364dbccf87eef0d26838fa4bb3ae26410f6c4818836Behdad Esfahbod info[i].indic_position() = POS_PRE_C; 365dbccf87eef0d26838fa4bb3ae26410f6c4818836Behdad Esfahbod info[base].indic_position() = POS_BASE_C; 36645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 367fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod /* Handle beginning Ra */ 3680831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod if (mask_array[RPHF] && 3690831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod start != base && 3700831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod start + 3 <= end && 3710831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod info[start].indic_category() == OT_Ra && 3720831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod info[start + 1].indic_category() == OT_H && 3730831061efb78983b9c6e1e72574c977e56383c08Behdad Esfahbod !is_joiner (info[start + 2])) 374dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start].indic_position() = POS_RA_TO_BECOME_REPH; 375fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod 376f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* For old-style Indic script tags, move the first post-base Halant after 377f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod * last consonant. */ 378f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if ((map->get_chosen_script (0) & 0x000000FF) != '2') { 379f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* We should only do this for Indic scripts which have a version two I guess. */ 3803c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 381f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (info[i].indic_category() == OT_H) { 382f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod unsigned int j; 383f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod for (j = end - 1; j > i; j--) 384190eb31a16178269aecaf5d2ecc9012f956749f4Behdad Esfahbod if (is_consonant (info[j])) 385f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 386f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (j > i) { 387f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* Move Halant to after last consonant. */ 388f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod hb_glyph_info_t t = info[i]; 389f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0])); 390f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod info[j] = t; 391f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 392f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 393f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 394f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 395f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod 39645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Attach ZWJ, ZWNJ, nukta, and halant to previous char to move with them. */ 397ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if (!options.uniscribe_bug_compatible) 398ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 399ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod /* Please update the Uniscribe branch when touching this! */ 400ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 401ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) 402ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[i - 1].indic_position(); 403ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } else { 40467ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod /* 40567ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod * Uniscribe doesn't move the Halant with Left Matra. 40667ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod * TEST: U+092B,U+093F,U+094DE 40767ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod */ 408ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod /* Please update the non-Uniscribe branch when touching this! */ 409ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 410ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) { 411ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[i - 1].indic_position(); 412ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if (info[i].indic_category() == OT_H && info[i].indic_position() == POS_LEFT_MATRA) 413ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int j = i; j > start; j--) 414ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if (info[j - 1].indic_position() != POS_LEFT_MATRA) { 415ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[j - 1].indic_position(); 416ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod break; 417ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 418ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 419ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 42045d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 42145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* We do bubble-sort, skip malicious clusters attempts */ 422b99d63ae114fb58f129562b293a8a66543d499adBehdad Esfahbod if (end - start < 64) 423a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod { 424a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod /* Sit tight, rock 'n roll! */ 425d3637edb248162970e202e9d0671540274192844Behdad Esfahbod hb_bubble_sort (info + start, end - start, compare_indic_order); 426a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod /* Find base again */ 427a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod base = end; 4283c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < end; i++) 429a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod if (info[i].indic_position() == POS_BASE_C) { 430a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod base = i; 431a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod break; 432a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod } 433a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod } 43445d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 435743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Setup masks now */ 436743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 437281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod { 438281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod hb_mask_t mask; 439281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod 440dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* Reph */ 441668c6046c1b3af3bd316bda0cc8636f2a5e8df42Behdad Esfahbod for (unsigned int i = start; i < end && info[i].indic_position() == POS_RA_TO_BECOME_REPH; i++) 442668c6046c1b3af3bd316bda0cc8636f2a5e8df42Behdad Esfahbod info[i].mask |= mask_array[RPHF]; 443dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 444281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Pre-base */ 445281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod mask = mask_array[HALF] | mask_array[AKHN] | mask_array[CJCT]; 4463c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < base; i++) 447281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 448281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Base */ 449281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod mask = mask_array[AKHN] | mask_array[CJCT]; 450281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[base].mask |= mask; 451281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Post-base */ 452281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod mask = mask_array[BLWF] | mask_array[PSTF] | mask_array[CJCT]; 4533c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 454281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 455281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod } 4569da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 4579da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod /* Apply ZWJ/ZWNJ effects */ 4583c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 4599da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod if (is_joiner (info[i])) { 4609da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod bool non_joiner = info[i].indic_category() == OT_ZWNJ; 4616b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod unsigned int j = i; 4629da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 4639da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod do { 4649da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod j--; 4656b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 4663bf27a9f0e92aa31b464bd3b9fdea5933c9ae8b1Behdad Esfahbod info[j].mask &= ~mask_array[CJCT]; 4676b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod if (non_joiner) 468c6d904d67db589dd6209928e56504f04f6a07756Behdad Esfahbod info[j].mask &= ~mask_array[HALF]; 4696b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 4709da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } while (j > start && !is_consonant (info[j])); 4719da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } 472743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 473743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 474743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 475743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 476ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodinitial_reordering_vowel_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 477ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 478743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 479c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod /* We made the vowels look like consonants. So let's call the consonant logic! */ 480c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod initial_reordering_consonant_syllable (map, buffer, mask_array, start, end); 481743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 482743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 483743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 484ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodinitial_reordering_standalone_cluster (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 485ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 486743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 48718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod /* We treat NBSP/dotted-circle as if they are consonants, so we should just chain. 48818c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * Only if not in compatibility mode that is... */ 48918c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod 49018c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod if (options.uniscribe_bug_compatible) 49118c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod { 49218c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod /* For dotted-circle, this is what Uniscribe does: 49318c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * If dotted-circle is the last glyph, it just does nothing. 49418c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * Ie. It doesn't form Reph. */ 49518c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod if (buffer->info[end - 1].indic_category() == OT_DOTTEDCIRCLE) 49618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod return; 49718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod } 49818c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod 4991a1fa8c655a082fc1439608457ba717306cc83caBehdad Esfahbod initial_reordering_consonant_syllable (map, buffer, mask_array, start, end); 500743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 501743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 502743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 503ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodinitial_reordering_non_indic (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 504743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int start, unsigned int end) 505743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 506743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Nothing to do right now. If we ever switch to using the output 507743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * buffer in the reordering process, we'd need to next_glyph() here. */ 508743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 509743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 510743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod#include "hb-ot-shape-complex-indic-machine.hh" 511743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 512743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 513743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 514743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_face_t *face, 515743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 516743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED) 517743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 518b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod hb_mask_t mask_array[ARRAY_LENGTH (indic_basic_features)] = {0}; 519b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod unsigned int num_masks = ARRAY_LENGTH (indic_basic_features); 520b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < num_masks; i++) 52176f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod mask_array[i] = map->get_1_mask (indic_basic_features[i].tag); 522743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 523743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod find_syllables (map, buffer, mask_array); 524b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 525b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 526743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 527eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodfinal_reordering_syllable (hb_buffer_t *buffer, hb_mask_t *mask_array, 528ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 529743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 5304ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod hb_glyph_info_t *info = buffer->info; 5314ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 532e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod /* 4. Final reordering: 533e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 534e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * After the localized forms and basic shaping forms GSUB features have been 535e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * applied (see below), the shaping engine performs some final glyph 536e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * reordering before applying all the remaining font features to the entire 537e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * cluster. 5384ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod */ 5394ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5404ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* Find base again */ 5414ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod unsigned int base = end; 5424ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod for (unsigned int i = start; i < end; i++) 5434ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod if (info[i].indic_position() == POS_BASE_C) { 5444ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod base = i; 5454ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod break; 5464ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 5474ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5484ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod if (base == start) { 5494ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* There's no Reph, and no left Matra to reposition. Just merge the cluster 5504ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod * and go home. */ 5514ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod buffer->merge_clusters (start, end); 5524ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod return; 5534ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 5544ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5554705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod unsigned int start_of_last_cluster = base; 5564705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod 5574ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* o Reorder matras: 558e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 559e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base matra character had been reordered before applying basic 560e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * features, the glyph can be moved closer to the main consonant based on 561e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * whether half-forms had been formed. Actual position for the matra is 562e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * defined as “after last standalone halant glyph, after initial matra 563e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * position and before the main consonant”. If ZWJ or ZWNJ follow this 564e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * halant, position is moved after it. 5654ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod */ 5664ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5674ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod unsigned int new_matra_pos = base - 1; 5684ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod while (new_matra_pos > start && 5694ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod !(FLAG (info[new_matra_pos].indic_category()) & (FLAG (OT_M) | FLAG (OT_H)))) 5704ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod new_matra_pos--; 5716782bdae3be0357da1dadc7b806a43ceefa67a90Behdad Esfahbod /* If we found no Halant we are done. Otherwise only proceed if the Halant does 5726782bdae3be0357da1dadc7b806a43ceefa67a90Behdad Esfahbod * not belong to the Matra itself! */ 5736782bdae3be0357da1dadc7b806a43ceefa67a90Behdad Esfahbod if (info[new_matra_pos].indic_category() == OT_H && 5746782bdae3be0357da1dadc7b806a43ceefa67a90Behdad Esfahbod info[new_matra_pos].indic_position() != POS_LEFT_MATRA) { 5754ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 5764ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod if (new_matra_pos + 1 < end && is_joiner (info[new_matra_pos + 1])) 5774ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod new_matra_pos++; 5784ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5794ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* Now go see if there's actually any matras... */ 5804ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod for (unsigned int i = new_matra_pos; i > start; i--) 5817708ee23cbcc8c8edce13e73b6e549b77bd8c2d0Behdad Esfahbod if (info[i - 1].indic_position () == POS_LEFT_MATRA) 5824ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod { 5834ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod unsigned int old_matra_pos = i - 1; 5844ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod hb_glyph_info_t matra = info[old_matra_pos]; 5854ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod memmove (&info[old_matra_pos], &info[old_matra_pos + 1], (new_matra_pos - old_matra_pos) * sizeof (info[0])); 5864ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod info[new_matra_pos] = matra; 5874705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod start_of_last_cluster = MIN (new_matra_pos, start_of_last_cluster); 5884ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod new_matra_pos--; 5894ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 5904ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 5914ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5924ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5934ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* o Reorder reph: 594e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 595e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Reph’s original position is always at the beginning of the syllable, 596e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * (i.e. it is not reordered at the character reordering stage). However, 597e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * it will be reordered according to the basic-forms shaping results. 598e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Possible positions for reph, depending on the script, are; after main, 599e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * before post-base consonant forms, and after post-base consonant forms. 600dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod */ 601dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 602dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* If there's anything after the Ra that has the REPH pos, it ought to be halant. 603dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * Which means that the font has failed to ligate the Reph. In which case, we 604dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * shouldn't move. */ 605dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod if (start + 1 < end && 606dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start].indic_position() == POS_RA_TO_BECOME_REPH && 607dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start + 1].indic_position() != POS_RA_TO_BECOME_REPH) 608dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod { 60902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod unsigned int new_reph_pos; 61002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 61102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod enum reph_position_t { 61202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod REPH_AFTER_MAIN, /* Malayalam, Oriya */ 61302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod REPH_BEFORE_SUBSCRIPT, /* Gurmukhi */ 61402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod REPH_AFTER_SUBSCRIPT, /* Bengali */ 61502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod REPH_BEFORE_POSTSCRIPT, /* Devanagari, Gujarati */ 61602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod REPH_AFTER_POSTSCRIPT, /* Kannada, Tamil, Telugu */ 61702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } reph_pos = REPH_BEFORE_POSTSCRIPT; /* XXX */ /* XXX Figure out old behavior too */ 61802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 619dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* 1. If reph should be positioned after post-base consonant forms, 620dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * proceed to step 5. 62102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 62202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_1: 62302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 62402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (reph_pos == REPH_AFTER_POSTSCRIPT) 62502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_step_5; 62602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 62702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 62802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 2. If the reph repositioning class is not after post-base: target 629dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * position is after the first explicit halant glyph between the 630dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first post-reph consonant and last main consonant. If ZWJ or ZWNJ 631dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * are following this halant, position is moved after it. If such 632dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * position is found, this is the target position. Otherwise, 633dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * proceed to the next step. 634dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * 635dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * Note: in old-implementation fonts, where classifications were 636dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * fixed in shaping engine, there was no case where reph position 637dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * will be found on this step. 63802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 63902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_2: 64002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 64102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos = start + 1; 64202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod while (new_reph_pos < base && info[new_reph_pos].indic_category() != OT_H) 64302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos++; 64402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 64502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (new_reph_pos < base && info[new_reph_pos].indic_category() == OT_H) { 64602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 64702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 64802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos++; 64902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_move; 65002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 65102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 65202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 65302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 3. If reph should be repositioned after the main consonant: find the 654dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first consonant not ligated with main, or find the first 655dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * consonant that is not a potential pre-base reordering Ra. 65602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 65702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_3: 65802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 65902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* XXX */ 66002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 66102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 66202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 4. If reph should be positioned before post-base consonant, find 663dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first post-base classified consonant not ligated with main. If no 664dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * consonant is found, the target position should be before the 665dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first matra, syllable modifier sign or vedic sign. 66602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 66702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_4: 66802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 66902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* XXX */ 67002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 67102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 67202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 5. If no consonant is found in steps 3 or 4, move reph to a position 673dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * immediately before the first post-base matra, syllable modifier 674dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * sign or vedic sign that has a reordering class after the intended 675dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * reph position. For example, if the reordering position for reph 676dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * is post-main, it will skip above-base matras that also have a 677dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * post-main position. 678dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod */ 67902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_5: 68002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 68102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* XXX */ 68202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 683dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 68402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 6. Otherwise, reorder reph to the end of the syllable. 68502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 68602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_6: 68702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 68802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos = end - 1; 68902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod while (new_reph_pos > start && info[new_reph_pos].indic_position() == POS_SMVD) 69002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos--; 69102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 692892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod /* 693892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * If the Reph is to be ending up after a Matra,Halant sequence, 694892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * position it before that Halant so it can interact with the Matra. 695892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * However, if it's a plain Consonant,Halant we shouldn't do that. 696892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * Uniscribe doesn't do this. 697892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * TEST: U+0930,U+094D,U+0915,U+094B,U+094D 698892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod */ 699892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod if (!options.uniscribe_bug_compatible && 700892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod unlikely (info[new_reph_pos].indic_category() == OT_H)) { 70102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod for (unsigned int i = base + 1; i < new_reph_pos; i++) 70202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (info[i].indic_category() == OT_M) { 70302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* Ok, got it. */ 70402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos--; 70502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 70602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 70702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_move; 7088df5636968389ac7bf8620ccd091fd4872b0bbeeBehdad Esfahbod } 7098df5636968389ac7bf8620ccd091fd4872b0bbeeBehdad Esfahbod 71002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_move: 71102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 71202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* Move */ 71302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod hb_glyph_info_t reph = info[start]; 71402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod memmove (&info[start], &info[start + 1], (new_reph_pos - start) * sizeof (info[0])); 71502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod info[new_reph_pos] = reph; 71602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod start_of_last_cluster = start; /* Yay, one big cluster! */ 71702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 718dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod } 719dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 720dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 721dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* o Reorder pre-base reordering consonants: 722e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 723e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base reordering consonant is found, reorder it according to 724e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * the following rules: 725e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 726e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 1. Only reorder a glyph produced by substitution during application 727e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * of the feature. (Note that a font may shape a Ra consonant with 728e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * the feature generally but block it in certain contexts.) 729e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 730e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 2. Try to find a target position the same way as for pre-base matra. 731e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If it is found, reorder pre-base consonant glyph. 732e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 733e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 3. If position is not found, reorder immediately before main 734e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * consonant. 735e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod */ 736e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 737eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod /* TODO */ 738eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 739eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 740eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 741eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 74221d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 74321d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod /* Finish off the clusters and go home! */ 74421d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 745ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if (!options.uniscribe_bug_compatible) 746ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 74721d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod /* This is what Uniscribe does. Ie. add cluster boundaries after Halant,ZWNJ. 74821d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * This means, half forms are submerged into the main consonants cluster. 74921d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * This is unnecessary, and makes cursor positioning harder, but that's what 75021d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * Uniscribe does. */ 75121d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod unsigned int cluster_start = start; 75221d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod for (unsigned int i = start + 1; i < start_of_last_cluster; i++) 75321d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod if (info[i - 1].indic_category() == OT_H && info[i].indic_category() == OT_ZWNJ) { 75421d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod i++; 75521d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod buffer->merge_clusters (cluster_start, i); 75621d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod cluster_start = i; 75721d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod } 75821d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod start_of_last_cluster = cluster_start; 75921d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod } 76021d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 76121d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod buffer->merge_clusters (start_of_last_cluster, end); 762ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod} 763e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 764e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 765ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodstatic void 766ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 767ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_face_t *face, 768ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_buffer_t *buffer, 769ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod void *user_data HB_UNUSED) 770ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod{ 771ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int count = buffer->len; 772ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod if (!count) return; 773ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod 774eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod hb_mask_t mask_array[ARRAY_LENGTH (indic_other_features)] = {0}; 775eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod unsigned int num_masks = ARRAY_LENGTH (indic_other_features); 776eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod for (unsigned int i = 0; i < num_masks; i++) 777eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod mask_array[i] = map->get_1_mask (indic_other_features[i].tag); 778eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 779ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 780ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int last = 0; 781cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod unsigned int last_syllable = info[0].syllable(); 782ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod for (unsigned int i = 1; i < count; i++) 783cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod if (last_syllable != info[i].syllable()) { 784eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod final_reordering_syllable (buffer, mask_array, last, i); 785ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod last = i; 786cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod last_syllable = info[last].syllable(); 787ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod } 788eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod final_reordering_syllable (buffer, mask_array, last, count); 789e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 790743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); 791743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); 792743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 793743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 794743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 795b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 796