hb-ot-shape-complex-indic.cc revision a3e04bee2c2fa648759a87e460db6b4f1b685586
1b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod/* 227aba594c90b4444c35273a38f5fedc8e09d9a88Behdad Esfahbod * Copyright © 2011,2012 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" 28a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod#include "hb-ot-shape-private.hh" 29352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod 30a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod#define OLD_INDIC_TAG(script) (((hb_tag_t) script) | 0x20000000) 31a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod#define IS_OLD_INDIC_TAG(tag) ( \ 32a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_BENGALI) || \ 33a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_DEVANAGARI) || \ 34a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_GUJARATI) || \ 35a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_GURMUKHI) || \ 36a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_KANNADA) || \ 37a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_MALAYALAM) || \ 38a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_ORIYA) || \ 39a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_TAMIL) || \ 40a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod (tag) == OLD_INDIC_TAG (HB_SCRIPT_TELUGU) \ 41a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod ) 42a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbodstruct indic_options_t 43ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod{ 44a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod int initialized : 1; 45a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod int uniscribe_bug_compatible : 1; 46a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod}; 47a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod 48a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbodunion indic_options_union_t { 49a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod int i; 50a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod indic_options_t opts; 51a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod}; 52a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad EsfahbodASSERT_STATIC (sizeof (int) == sizeof (indic_options_union_t)); 53a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod 54a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbodstatic indic_options_union_t 55a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbodindic_options_init (void) 56a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod{ 57a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod indic_options_union_t u; 58a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod u.i = 0; 59a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod u.opts.initialized = 1; 60a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod 61a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod char *c = getenv ("HB_OT_INDIC_OPTIONS"); 62a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod u.opts.uniscribe_bug_compatible = c && strstr (c, "uniscribe-bug-compatible"); 63a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod 64a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod return u; 65a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod} 66a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod 67a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbodinline indic_options_t 68a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbodindic_options (void) 69a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod{ 70a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod static indic_options_union_t options; 71a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod 72a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (unlikely (!options.i)) { 73a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod /* This is idempotent and threadsafe. */ 74a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod options = indic_options_init (); 75ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 76ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod 77a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod return options.opts; 78a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod} 79a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod 80ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod 81743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic int 82743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodcompare_codepoint (const void *pa, const void *pb) 83743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 84743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_codepoint_t a = * (hb_codepoint_t *) pa; 85743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_codepoint_t b = * (hb_codepoint_t *) pb; 86743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 87743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod return a < b ? -1 : a == b ? 0 : +1; 88743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 89743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 90743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic indic_position_t 91743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodconsonant_position (hb_codepoint_t u) 92743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 93743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod consonant_position_t *record; 94743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 950de771b72da6b342b015e3556190821547a4011dBehdad Esfahbod /* Khmer does not have pre-base half forms. */ 960de771b72da6b342b015e3556190821547a4011dBehdad Esfahbod if (0x1780 <= u && u <= 0x17FF) 970de771b72da6b342b015e3556190821547a4011dBehdad Esfahbod return POS_BELOW_C; 980de771b72da6b342b015e3556190821547a4011dBehdad Esfahbod 99743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod record = (consonant_position_t *) bsearch (&u, consonant_positions, 100743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod ARRAY_LENGTH (consonant_positions), 101743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod sizeof (consonant_positions[0]), 102743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod compare_codepoint); 103743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 104dbccf87eef0d26838fa4bb3ae26410f6c4818836Behdad Esfahbod return record ? record->position : POS_BASE_C; 105743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 106743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 107352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbodstatic bool 108352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbodis_ra (hb_codepoint_t u) 109352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod{ 110352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod return !!bsearch (&u, ra_chars, 111352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod ARRAY_LENGTH (ra_chars), 112352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod sizeof (ra_chars[0]), 113352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod compare_codepoint); 114352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod} 115352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod 1169ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbodstatic bool 1179da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodis_joiner (const hb_glyph_info_t &info) 1189ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod{ 1199da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod return !!(FLAG (info.indic_category()) & (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ))); 1209da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod} 1219da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 1229da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodstatic bool 1239da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodis_consonant (const hb_glyph_info_t &info) 1249da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod{ 1251a1fa8c655a082fc1439608457ba717306cc83caBehdad Esfahbod /* Note: 1261a1fa8c655a082fc1439608457ba717306cc83caBehdad Esfahbod * 12718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * We treat Vowels and placeholders as if they were consonants. This is safe because Vowels 128c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod * cannot happen in a consonant syllable. The plus side however is, we can call the 129c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod * consonant syllable logic from the vowel syllable function and get it all right! */ 13018c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod return !!(FLAG (info.indic_category()) & (FLAG (OT_C) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_DOTTEDCIRCLE))); 1319ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod} 132c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod 133eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstruct feature_list_t { 134c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod hb_tag_t tag; 135c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod hb_bool_t is_global; 136eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod}; 137eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 138eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstatic const feature_list_t 139eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodindic_basic_features[] = 140b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 141c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('n','u','k','t'), true}, 142c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('a','k','h','n'), false}, 143c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('r','p','h','f'), false}, 1441ac075b227090a9ad930dcc1670236c176b27067Behdad Esfahbod {HB_TAG('r','k','r','f'), true}, 145c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('p','r','e','f'), false}, 146c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('b','l','w','f'), false}, 147c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('h','a','l','f'), false}, 14829f106d7fba25e1464debd3a4831a7380d75c4c9Behdad Esfahbod {HB_TAG('a','b','v','f'), false}, 149c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('p','s','t','f'), false}, 1509da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod {HB_TAG('c','j','c','t'), false}, 1511d6846db9ebf84561bb30a4e48c6c43184914099Behdad Esfahbod {HB_TAG('v','a','t','u'), true}, 152c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod}; 153c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod 154c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod/* Same order as the indic_basic_features array */ 155c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbodenum { 156c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod _NUKT, 157c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod AKHN, 158c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod RPHF, 159df6d45c693c417bf311e6fa49f18a8558542e525Behdad Esfahbod _RKRF, 160c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod PREF, 161c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod BLWF, 162c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod HALF, 16329f106d7fba25e1464debd3a4831a7380d75c4c9Behdad Esfahbod ABVF, 164c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod PSTF, 1651d6846db9ebf84561bb30a4e48c6c43184914099Behdad Esfahbod CJCT, 1661d6846db9ebf84561bb30a4e48c6c43184914099Behdad Esfahbod VATU 167b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod}; 168b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 169eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstatic const feature_list_t 170eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodindic_other_features[] = 171b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 172eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('i','n','i','t'), false}, 173eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('p','r','e','s'), true}, 174eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('a','b','v','s'), true}, 175eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('b','l','w','s'), true}, 176eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('p','s','t','s'), true}, 177eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('h','a','l','n'), true}, 178eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 179eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('d','i','s','t'), true}, 180eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('a','b','v','m'), true}, 181eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('b','l','w','m'), true}, 182eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod}; 183eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 184eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod/* Same order as the indic_other_features array */ 185eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodenum { 186eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod INIT 187b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod}; 188b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 189743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 190743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 191743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 192743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_face_t *face, 193743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 194743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 195f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodstatic void 196f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 197f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_face_t *face, 198f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_buffer_t *buffer, 199743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 200b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 201b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 2029f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod_hb_ot_shape_complex_collect_features_indic (hb_ot_map_builder_t *map, 2039f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod const hb_segment_properties_t *props HB_UNUSED) 204b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 205f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('l','o','c','l')); 206a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod /* The Indic specs do not require ccmp, but we apply it here since if 207a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod * there is a use of it, it's typically at the beginning. */ 208f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('c','c','m','p')); 209f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 210743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod map->add_gsub_pause (initial_reordering, NULL); 211f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 212412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_basic_features); i++) { 21376f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod map->add_bool_feature (indic_basic_features[i].tag, indic_basic_features[i].is_global); 214412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 215412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 216b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 217f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_gsub_pause (final_reordering, NULL); 218f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 219412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_other_features); i++) { 220eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod map->add_bool_feature (indic_other_features[i].tag, indic_other_features[i].is_global); 221412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 222412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 223b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 224b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 225867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 22611138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbodhb_ot_shape_normalization_mode_t 22711138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod_hb_ot_shape_complex_normalization_preference_indic (void) 22802cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod{ 22902cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod /* We want split matras decomposed by the common shaping logic. */ 23011138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod return HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED; 23102cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod} 23202cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod 233867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 234b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 2359f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod_hb_ot_shape_complex_setup_masks_indic (hb_ot_map_t *map HB_UNUSED, 2369f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 2373f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod hb_font_t *font HB_UNUSED) 238b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 2399f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_category); 2409f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_position); 2419f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod 242743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* We cannot setup masks here. We save information about characters 243743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and setup masks later on in a pause-callback. */ 244743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 245743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int count = buffer->len; 246b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < count; i++) 247b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod { 24892332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod hb_glyph_info_t &info = buffer->info[i]; 24992332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod unsigned int type = get_indic_categories (info.codepoint); 25092332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod 25192332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = type & 0x0F; 25292332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = type >> 4; 25392332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod 2543399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod /* The spec says U+0952 is OT_A. However, testing shows that Uniscribe 2553399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * treats U+0951..U+0952 all as OT_VD. 2563399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * TESTS: 2573399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0947,U+0952 2583399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0952,U+0947 2593399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0947,U+0951 2603399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0951,U+0947 2613399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * */ 2623399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod if (unlikely (hb_in_range<hb_codepoint_t> (info.codepoint, 0x0951, 0x0954))) 2633399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod info.indic_category() = OT_VD; 2643399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod 26592332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod if (info.indic_category() == OT_C) { 26692332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = consonant_position (info.codepoint); 26792332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod if (is_ra (info.codepoint)) 26892332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_Ra; 26992332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod } else if (info.indic_category() == OT_SM || 27092332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() == OT_VD) { 27192332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = POS_SMVD; 27292332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod } else if (unlikely (info.codepoint == 0x200C)) 27392332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_ZWNJ; 27492332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod else if (unlikely (info.codepoint == 0x200D)) 27592332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_ZWJ; 27618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod else if (unlikely (info.codepoint == 0x25CC)) 27718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod info.indic_category() = OT_DOTTEDCIRCLE; 278b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod } 279743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 280b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 28145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodstatic int 28245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodcompare_indic_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) 28345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod{ 28445d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int a = pa->indic_position(); 28545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int b = pb->indic_position(); 28645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 28745d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod return a < b ? -1 : a == b ? 0 : +1; 28845d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod} 289867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 2907ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod/* Rules from: 2917ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */ 2927ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod 293743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 294ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodinitial_reordering_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array, 295ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 296743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 297ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 298743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 299617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod 300743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 1. Find base consonant: 301743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 302743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The shaping engine finds the base consonant of the syllable, using the 303743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following algorithm: starting from the end of the syllable, move backwards 304743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * until a consonant is found that does not have a below-base or post-base 305743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * form (post-base forms have to follow below-base forms), or that is not a 306743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * pre-base reordering Ra, or arrive at the first consonant. The consonant 307743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * stopped at will be the base. 308743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 309743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o If the syllable starts with Ra + Halant (in a script that has Reph) 310743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 311743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * base consonants. 312743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 313743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 3145e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod unsigned int base = end; 31576b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod bool has_reph = false; 316743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 31776b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod { 318617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 319617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 320617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * base consonants. */ 321617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod unsigned int limit = start; 322617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod if (mask_array[RPHF] && 323617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod start + 3 <= end && 324617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod info[start].indic_category() == OT_Ra && 325617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod info[start + 1].indic_category() == OT_H && 326617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod !is_joiner (info[start + 2])) 327617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod { 328617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod limit += 2; 329617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod base = start; 330617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod has_reph = true; 331617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod }; 33276b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod 3333c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> starting from the end of the syllable, move backwards */ 3343c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod unsigned int i = end; 3353c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod do { 3363c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod i--; 3373c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> until a consonant is found */ 3383c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (is_consonant (info[i])) 339743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod { 3403c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> that does not have a below-base or post-base form 3413c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * (post-base forms have to follow below-base forms), */ 3423c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (info[i].indic_position() != POS_BELOW_C && 3433c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod info[i].indic_position() != POS_POST_C) 3443c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod { 3453c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = i; 3463c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod break; 3473c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } 348743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 3493c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> or that is not a pre-base reordering Ra, 3503c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * 3513c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * TODO 3523c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod */ 353e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 3543c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> or arrive at the first consonant. The consonant stopped at will 3553c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * be the base. */ 3563c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = i; 3573c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } 3583c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod else 3593c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (is_joiner (info[i])) 3603c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod break; 3613c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } while (i > limit); 3623c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (base < start) 3633c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = start; /* Just in case... */ 364743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 365617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod 366617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 367617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 368617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * base consonants. */ 369617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod if (has_reph && base == start) { 370617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* Have no other consonant, so Reph is not formed and Ra becomes base. */ 371617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod has_reph = false; 372617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod } 3735e4e21fce4b548b0b8a5951bc8f35a9f27428192Behdad Esfahbod } 3743d25079f8d6be81b9b4b91d3a97016b8a572f571Behdad Esfahbod 3753d25079f8d6be81b9b4b91d3a97016b8a572f571Behdad Esfahbod 376743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 2. Decompose and reorder Matras: 377743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 378743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Each matra and any syllable modifier sign in the cluster are moved to the 379743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * appropriate position relative to the consonant(s) in the cluster. The 380743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * shaping engine decomposes two- or three-part matras into their constituent 381743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * parts before any repositioning. Matra characters are classified by which 382743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * consonant in a conjunct they have affinity for and are reordered to the 383743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following positions: 384743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 385743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o Before first half form in the syllable 386743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After subjoined consonants 387743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After post-form consonant 388743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After main consonant (for above marks) 389743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 390743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 391743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 392743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The normalize() routine has already decomposed matras for us, so we don't 393743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * need to worry about that. 394743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 395743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 396743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 397743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 3. Reorder marks to canonical order: 398743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 399743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Adjacent nukta and halant or nukta and vedic sign are always repositioned 400743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * if necessary, so that the nukta is first. 401743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 402743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 403743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 404743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * We don't need to do this: the normalize() routine already did this for us. 405743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 406743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 407743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 40845d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Reorder characters */ 40945d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 4103c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < base; i++) 411dbccf87eef0d26838fa4bb3ae26410f6c4818836Behdad Esfahbod info[i].indic_position() = POS_PRE_C; 412dbccf87eef0d26838fa4bb3ae26410f6c4818836Behdad Esfahbod info[base].indic_position() = POS_BASE_C; 41345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 414fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod /* Handle beginning Ra */ 4155e4e21fce4b548b0b8a5951bc8f35a9f27428192Behdad Esfahbod if (has_reph) 416dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start].indic_position() = POS_RA_TO_BECOME_REPH; 417fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod 418f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* For old-style Indic script tags, move the first post-base Halant after 419f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod * last consonant. */ 420a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod if (IS_OLD_INDIC_TAG (map->get_chosen_script (0))) { 4213c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 422f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (info[i].indic_category() == OT_H) { 423f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod unsigned int j; 424f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod for (j = end - 1; j > i; j--) 425190eb31a16178269aecaf5d2ecc9012f956749f4Behdad Esfahbod if (is_consonant (info[j])) 426f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 427f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (j > i) { 428f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* Move Halant to after last consonant. */ 429f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod hb_glyph_info_t t = info[i]; 430f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0])); 431f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod info[j] = t; 432f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 433f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 434f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 435f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 436f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod 43745d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Attach ZWJ, ZWNJ, nukta, and halant to previous char to move with them. */ 438a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (!indic_options ().uniscribe_bug_compatible) 439ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 440ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod /* Please update the Uniscribe branch when touching this! */ 441ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 442ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) 443ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[i - 1].indic_position(); 444ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } else { 44567ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod /* 44667ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod * Uniscribe doesn't move the Halant with Left Matra. 44767ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod * TEST: U+092B,U+093F,U+094DE 44867ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod */ 449ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod /* Please update the non-Uniscribe branch when touching this! */ 450ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 451ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) { 452ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[i - 1].indic_position(); 4536a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[i].indic_category() == OT_H && info[i].indic_position() == POS_PRE_M) 454ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int j = i; j > start; j--) 4556a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[j - 1].indic_position() != POS_PRE_M) { 456ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[j - 1].indic_position(); 457ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod break; 458ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 459ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 460ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 46145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 46245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* We do bubble-sort, skip malicious clusters attempts */ 463b99d63ae114fb58f129562b293a8a66543d499adBehdad Esfahbod if (end - start < 64) 464a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod { 465a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod /* Sit tight, rock 'n roll! */ 466d3637edb248162970e202e9d0671540274192844Behdad Esfahbod hb_bubble_sort (info + start, end - start, compare_indic_order); 467a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod /* Find base again */ 468a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod base = end; 4693c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < end; i++) 470a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod if (info[i].indic_position() == POS_BASE_C) { 471a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod base = i; 472a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod break; 473a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod } 474a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod } 47545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 476743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Setup masks now */ 477743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 478281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod { 479281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod hb_mask_t mask; 480281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod 481dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* Reph */ 482668c6046c1b3af3bd316bda0cc8636f2a5e8df42Behdad Esfahbod for (unsigned int i = start; i < end && info[i].indic_position() == POS_RA_TO_BECOME_REPH; i++) 483668c6046c1b3af3bd316bda0cc8636f2a5e8df42Behdad Esfahbod info[i].mask |= mask_array[RPHF]; 484dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 485281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Pre-base */ 486281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod mask = mask_array[HALF] | mask_array[AKHN] | mask_array[CJCT]; 4873c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < base; i++) 488281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 489281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Base */ 490281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod mask = mask_array[AKHN] | mask_array[CJCT]; 491281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[base].mask |= mask; 492281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Post-base */ 49329f106d7fba25e1464debd3a4831a7380d75c4c9Behdad Esfahbod mask = mask_array[BLWF] | mask_array[ABVF] | mask_array[PSTF] | mask_array[CJCT]; 4943c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 495281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 496281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod } 4979da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 4989da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod /* Apply ZWJ/ZWNJ effects */ 4993c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 5009da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod if (is_joiner (info[i])) { 5019da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod bool non_joiner = info[i].indic_category() == OT_ZWNJ; 5026b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod unsigned int j = i; 5039da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 5049da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod do { 5059da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod j--; 5066b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 5073bf27a9f0e92aa31b464bd3b9fdea5933c9ae8b1Behdad Esfahbod info[j].mask &= ~mask_array[CJCT]; 5086b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod if (non_joiner) 509c6d904d67db589dd6209928e56504f04f6a07756Behdad Esfahbod info[j].mask &= ~mask_array[HALF]; 5106b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 5119da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } while (j > start && !is_consonant (info[j])); 5129da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } 513743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 514743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 515743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 516743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 5179f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_vowel_syllable (const hb_ot_map_t *map, 5189f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 5199f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_mask_t *mask_array, 520ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 521743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 522c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod /* We made the vowels look like consonants. So let's call the consonant logic! */ 523c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod initial_reordering_consonant_syllable (map, buffer, mask_array, start, end); 524743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 525743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 526743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 5279f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_standalone_cluster (const hb_ot_map_t *map, 5289f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 5299f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_mask_t *mask_array, 530ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 531743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 53218c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod /* We treat NBSP/dotted-circle as if they are consonants, so we should just chain. 53318c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * Only if not in compatibility mode that is... */ 53418c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod 535a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (indic_options ().uniscribe_bug_compatible) 53618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod { 53718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod /* For dotted-circle, this is what Uniscribe does: 53818c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * If dotted-circle is the last glyph, it just does nothing. 53918c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * Ie. It doesn't form Reph. */ 54018c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod if (buffer->info[end - 1].indic_category() == OT_DOTTEDCIRCLE) 54118c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod return; 54218c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod } 54318c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod 5441a1fa8c655a082fc1439608457ba717306cc83caBehdad Esfahbod initial_reordering_consonant_syllable (map, buffer, mask_array, start, end); 545743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 546743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 547743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 5489f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_non_indic (const hb_ot_map_t *map HB_UNUSED, 5499f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer HB_UNUSED, 5509f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_mask_t *mask_array HB_UNUSED, 5513f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod unsigned int start HB_UNUSED, unsigned int end HB_UNUSED) 552743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 553743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Nothing to do right now. If we ever switch to using the output 554743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * buffer in the reordering process, we'd need to next_glyph() here. */ 555743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 556743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 557743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod#include "hb-ot-shape-complex-indic-machine.hh" 558743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 559743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 560743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 5613f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod hb_face_t *face HB_UNUSED, 562743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 563743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED) 564743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 565b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod hb_mask_t mask_array[ARRAY_LENGTH (indic_basic_features)] = {0}; 566b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod unsigned int num_masks = ARRAY_LENGTH (indic_basic_features); 567b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < num_masks; i++) 56876f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod mask_array[i] = map->get_1_mask (indic_basic_features[i].tag); 569743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 570743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod find_syllables (map, buffer, mask_array); 571b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 572b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 573743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 574eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodfinal_reordering_syllable (hb_buffer_t *buffer, hb_mask_t *mask_array, 575ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 576743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 5774ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod hb_glyph_info_t *info = buffer->info; 5784ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 579e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod /* 4. Final reordering: 580e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 581e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * After the localized forms and basic shaping forms GSUB features have been 582e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * applied (see below), the shaping engine performs some final glyph 583e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * reordering before applying all the remaining font features to the entire 584e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * cluster. 5854ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod */ 5864ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5874ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* Find base again */ 5884ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod unsigned int base = end; 5894ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod for (unsigned int i = start; i < end; i++) 5904ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod if (info[i].indic_position() == POS_BASE_C) { 5914ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod base = i; 5924ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod break; 5934ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 5944ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 5954ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod if (base == start) { 5964ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* There's no Reph, and no left Matra to reposition. Just merge the cluster 5974ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod * and go home. */ 5984ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod buffer->merge_clusters (start, end); 5994ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod return; 6004ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 6014ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 6024705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod unsigned int start_of_last_cluster = base; 6034705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod 6044ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* o Reorder matras: 605e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 606e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base matra character had been reordered before applying basic 607e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * features, the glyph can be moved closer to the main consonant based on 608e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * whether half-forms had been formed. Actual position for the matra is 609e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * defined as “after last standalone halant glyph, after initial matra 610e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * position and before the main consonant”. If ZWJ or ZWNJ follow this 611e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * halant, position is moved after it. 6124ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod */ 6134ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 6149d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod { 6159d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod unsigned int new_matra_pos = base - 1; 6169d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod while (new_matra_pos > start && 6179d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod !(FLAG (info[new_matra_pos].indic_category()) & (FLAG (OT_M) | FLAG (OT_H)))) 6189d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_matra_pos--; 6199d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* If we found no Halant we are done. Otherwise only proceed if the Halant does 6209d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod * not belong to the Matra itself! */ 6219d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (info[new_matra_pos].indic_category() == OT_H && 6226a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod info[new_matra_pos].indic_position() != POS_PRE_M) { 6239d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 6249d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (new_matra_pos + 1 < end && is_joiner (info[new_matra_pos + 1])) 6259d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_matra_pos++; 6269d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod 6279d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* Now go see if there's actually any matras... */ 6289d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod for (unsigned int i = new_matra_pos; i > start; i--) 6296a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[i - 1].indic_position () == POS_PRE_M) 6309d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod { 6319d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod unsigned int old_matra_pos = i - 1; 6329d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod hb_glyph_info_t matra = info[old_matra_pos]; 6339d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod memmove (&info[old_matra_pos], &info[old_matra_pos + 1], (new_matra_pos - old_matra_pos) * sizeof (info[0])); 6349d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod info[new_matra_pos] = matra; 6359d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod start_of_last_cluster = MIN (new_matra_pos, start_of_last_cluster); 6369d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_matra_pos--; 6379d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod } 6389d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod } 6394ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 6404ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 6414ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 6424ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* o Reorder reph: 643e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 644e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Reph’s original position is always at the beginning of the syllable, 645e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * (i.e. it is not reordered at the character reordering stage). However, 646e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * it will be reordered according to the basic-forms shaping results. 647e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Possible positions for reph, depending on the script, are; after main, 648e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * before post-base consonant forms, and after post-base consonant forms. 649dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod */ 650dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 651dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* If there's anything after the Ra that has the REPH pos, it ought to be halant. 652dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * Which means that the font has failed to ligate the Reph. In which case, we 653dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * shouldn't move. */ 654dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod if (start + 1 < end && 655dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start].indic_position() == POS_RA_TO_BECOME_REPH && 656dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start + 1].indic_position() != POS_RA_TO_BECOME_REPH) 657dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod { 65802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod unsigned int new_reph_pos; 65902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 66002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod enum reph_position_t { 661f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_AFTER_MAIN, 662f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_BEFORE_SUBSCRIPT, 663f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_AFTER_SUBSCRIPT, 664f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_BEFORE_POSTSCRIPT, 6659fc7a11469113d31d8095757c4fc038c3427d44aBehdad Esfahbod REPH_AFTER_POSTSCRIPT 666f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod } reph_pos; 667f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 668f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod /* XXX Figure out old behavior too */ 6697f852b644b8143492a02edfc853114aaa23446bdBehdad Esfahbod switch ((hb_tag_t) buffer->props.script) 670f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod { 671f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_MALAYALAM: 672f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_ORIYA: 673f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_MAIN; 674f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 675f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 676f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_GURMUKHI: 677f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_BEFORE_SUBSCRIPT; 678f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 679f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 680f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_BENGALI: 681f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_SUBSCRIPT; 682f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 683f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 684f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod default: 685f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_DEVANAGARI: 686f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_GUJARATI: 687f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_BEFORE_POSTSCRIPT; 688f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 689f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 690f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_KANNADA: 691f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_TAMIL: 692f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_TELUGU: 693f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_POSTSCRIPT; 694f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 695f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod } 69602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 697dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* 1. If reph should be positioned after post-base consonant forms, 698dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * proceed to step 5. 69902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 7009d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_POSTSCRIPT) 70102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 7029d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod goto reph_step_5; 70302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 70402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 70502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 2. If the reph repositioning class is not after post-base: target 706dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * position is after the first explicit halant glyph between the 707dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first post-reph consonant and last main consonant. If ZWJ or ZWNJ 708dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * are following this halant, position is moved after it. If such 709dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * position is found, this is the target position. Otherwise, 710dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * proceed to the next step. 711dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * 712dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * Note: in old-implementation fonts, where classifications were 713dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * fixed in shaping engine, there was no case where reph position 714dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * will be found on this step. 71502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 71602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 71702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos = start + 1; 71802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod while (new_reph_pos < base && info[new_reph_pos].indic_category() != OT_H) 71902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos++; 72002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 72102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (new_reph_pos < base && info[new_reph_pos].indic_category() == OT_H) { 72202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 72302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 72402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos++; 72502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_move; 72602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 72702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 72802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 72902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 3. If reph should be repositioned after the main consonant: find the 730dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first consonant not ligated with main, or find the first 731dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * consonant that is not a potential pre-base reordering Ra. 73202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 7339d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_MAIN) 73402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 73502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* XXX */ 73602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 73702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 73802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 4. If reph should be positioned before post-base consonant, find 739dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first post-base classified consonant not ligated with main. If no 740dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * consonant is found, the target position should be before the 741dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first matra, syllable modifier sign or vedic sign. 74202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 7439d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* This is our take on what step 4 is trying to say (and failing, BADLY). */ 7449d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_SUBSCRIPT) 74502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 7469d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_reph_pos = base; 7479d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod while (new_reph_pos < end && 7486a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod !( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_POST_C) | FLAG (POS_POST_M) | FLAG (POS_SMVD)))) 7499d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_reph_pos++; 7509d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (new_reph_pos < end) 7519d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod goto reph_move; 75202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 75302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 75402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 5. If no consonant is found in steps 3 or 4, move reph to a position 755dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * immediately before the first post-base matra, syllable modifier 756dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * sign or vedic sign that has a reordering class after the intended 757dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * reph position. For example, if the reordering position for reph 758dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * is post-main, it will skip above-base matras that also have a 759dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * post-main position. 760dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod */ 76102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_5: 76202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 76302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* XXX */ 76402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 765dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 76602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 6. Otherwise, reorder reph to the end of the syllable. 76702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 76802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 76902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos = end - 1; 77002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod while (new_reph_pos > start && info[new_reph_pos].indic_position() == POS_SMVD) 77102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos--; 77202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 773892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod /* 774892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * If the Reph is to be ending up after a Matra,Halant sequence, 775892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * position it before that Halant so it can interact with the Matra. 776892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * However, if it's a plain Consonant,Halant we shouldn't do that. 777892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * Uniscribe doesn't do this. 778892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * TEST: U+0930,U+094D,U+0915,U+094B,U+094D 779892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod */ 780a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (!indic_options ().uniscribe_bug_compatible && 781892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod unlikely (info[new_reph_pos].indic_category() == OT_H)) { 78202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod for (unsigned int i = base + 1; i < new_reph_pos; i++) 78302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (info[i].indic_category() == OT_M) { 78402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* Ok, got it. */ 78502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos--; 78602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 78702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 78802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_move; 7898df5636968389ac7bf8620ccd091fd4872b0bbeeBehdad Esfahbod } 7908df5636968389ac7bf8620ccd091fd4872b0bbeeBehdad Esfahbod 79102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_move: 79202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 79302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* Move */ 79402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod hb_glyph_info_t reph = info[start]; 79502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod memmove (&info[start], &info[start + 1], (new_reph_pos - start) * sizeof (info[0])); 79602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod info[new_reph_pos] = reph; 79702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod start_of_last_cluster = start; /* Yay, one big cluster! */ 79802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 799dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod } 800dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 801dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 802dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* o Reorder pre-base reordering consonants: 803e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 804e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base reordering consonant is found, reorder it according to 805e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * the following rules: 806e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 807e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 1. Only reorder a glyph produced by substitution during application 808e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * of the feature. (Note that a font may shape a Ra consonant with 809e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * the feature generally but block it in certain contexts.) 810e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 811e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 2. Try to find a target position the same way as for pre-base matra. 812e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If it is found, reorder pre-base consonant glyph. 813e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 814e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 3. If position is not found, reorder immediately before main 815e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * consonant. 816e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod */ 817e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 818eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod /* TODO */ 819eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 820eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 821eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 822a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod /* Apply 'init' to the Left Matra if it's a word start. */ 8236a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[start].indic_position () == POS_PRE_M && 824a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod (!start || 825eace47b173807d94b29a6490d0bc3c9f8f6168d1Behdad Esfahbod !(FLAG (_hb_glyph_info_get_general_category (&info[start - 1])) & 826a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod (FLAG (HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER) | 827a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER) | 828a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER) | 829a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER) | 830a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER) | 831a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | 832a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | 833a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK))))) 834a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod info[start].mask |= mask_array[INIT]; 835a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod 836eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 83721d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 83821d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod /* Finish off the clusters and go home! */ 83921d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 840a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (!indic_options ().uniscribe_bug_compatible) 841ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 84221d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod /* This is what Uniscribe does. Ie. add cluster boundaries after Halant,ZWNJ. 84321d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * This means, half forms are submerged into the main consonants cluster. 84421d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * This is unnecessary, and makes cursor positioning harder, but that's what 84521d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * Uniscribe does. */ 84621d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod unsigned int cluster_start = start; 84721d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod for (unsigned int i = start + 1; i < start_of_last_cluster; i++) 84821d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod if (info[i - 1].indic_category() == OT_H && info[i].indic_category() == OT_ZWNJ) { 84921d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod i++; 85021d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod buffer->merge_clusters (cluster_start, i); 85121d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod cluster_start = i; 85221d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod } 85321d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod start_of_last_cluster = cluster_start; 85421d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod } 85521d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 85621d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod buffer->merge_clusters (start_of_last_cluster, end); 857ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod} 858e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 859e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 860ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodstatic void 861ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 8623f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod hb_face_t *face HB_UNUSED, 863ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_buffer_t *buffer, 864ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod void *user_data HB_UNUSED) 865ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod{ 866ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int count = buffer->len; 867ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod if (!count) return; 868ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod 869eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod hb_mask_t mask_array[ARRAY_LENGTH (indic_other_features)] = {0}; 870eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod unsigned int num_masks = ARRAY_LENGTH (indic_other_features); 871eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod for (unsigned int i = 0; i < num_masks; i++) 872eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod mask_array[i] = map->get_1_mask (indic_other_features[i].tag); 873eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 874ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 875ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int last = 0; 876cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod unsigned int last_syllable = info[0].syllable(); 877ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod for (unsigned int i = 1; i < count; i++) 878cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod if (last_syllable != info[i].syllable()) { 879eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod final_reordering_syllable (buffer, mask_array, last, i); 880ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod last = i; 881cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod last_syllable = info[last].syllable(); 882ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod } 883eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod final_reordering_syllable (buffer, mask_array, last, count); 884e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 885743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); 886743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); 887743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 888743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 889743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 890b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 891