hb-ot-shape-complex-indic.cc revision af92b4cc90e4184d5bdd8037c551ed482700114f
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 184743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 185743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 186743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 187743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_face_t *face, 188743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 189743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 190f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodstatic void 191f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 192f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_face_t *face, 193f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_buffer_t *buffer, 194743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 195b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 196b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 1979f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod_hb_ot_shape_complex_collect_features_indic (hb_ot_map_builder_t *map, 1989f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod const hb_segment_properties_t *props HB_UNUSED) 199b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 200f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('l','o','c','l')); 201a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod /* The Indic specs do not require ccmp, but we apply it here since if 202a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod * there is a use of it, it's typically at the beginning. */ 203f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('c','c','m','p')); 204f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 205743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod map->add_gsub_pause (initial_reordering, NULL); 206f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 207412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_basic_features); i++) { 20876f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod map->add_bool_feature (indic_basic_features[i].tag, indic_basic_features[i].is_global); 209412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 210412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 211b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 212f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_gsub_pause (final_reordering, NULL); 213f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 214412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_other_features); i++) { 215eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod map->add_bool_feature (indic_other_features[i].tag, indic_other_features[i].is_global); 216412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 217412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 218b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 219b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 220d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbodvoid 221d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod_hb_ot_shape_complex_override_features_indic (hb_ot_map_builder_t *map, 222d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod const hb_segment_properties_t *props HB_UNUSED) 223d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod{ 224af92b4cc90e4184d5bdd8037c551ed482700114fBehdad Esfahbod /* Uniscribe does not apply 'kern'. */ 225af92b4cc90e4184d5bdd8037c551ed482700114fBehdad Esfahbod if (indic_options ().uniscribe_bug_compatible) 226af92b4cc90e4184d5bdd8037c551ed482700114fBehdad Esfahbod map->add_feature (HB_TAG('k','e','r','n'), 0, true); 227d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod} 228d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod 229867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 23011138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbodhb_ot_shape_normalization_mode_t 23111138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod_hb_ot_shape_complex_normalization_preference_indic (void) 23202cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod{ 23302cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod /* We want split matras decomposed by the common shaping logic. */ 23411138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod return HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED; 23502cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod} 23602cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod 237867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 238b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 2399f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod_hb_ot_shape_complex_setup_masks_indic (hb_ot_map_t *map HB_UNUSED, 2409f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 2413f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod hb_font_t *font HB_UNUSED) 242b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 2439f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_category); 2449f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_position); 2459f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod 246743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* We cannot setup masks here. We save information about characters 247743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and setup masks later on in a pause-callback. */ 248743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 249743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int count = buffer->len; 250b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < count; i++) 251b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod { 25292332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod hb_glyph_info_t &info = buffer->info[i]; 25392332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod unsigned int type = get_indic_categories (info.codepoint); 25492332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod 25592332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = type & 0x0F; 25692332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = type >> 4; 25792332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod 2583399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod /* The spec says U+0952 is OT_A. However, testing shows that Uniscribe 2593399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * treats U+0951..U+0952 all as OT_VD. 2603399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * TESTS: 2613399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0947,U+0952 2623399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0952,U+0947 2633399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0947,U+0951 2643399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * U+092E,U+0951,U+0947 2653399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod * */ 2663399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod if (unlikely (hb_in_range<hb_codepoint_t> (info.codepoint, 0x0951, 0x0954))) 2673399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod info.indic_category() = OT_VD; 2683399a06e7033651ee926448737bdb18e553c1796Behdad Esfahbod 269df50b8474094f0563ccfdae12c4425a51b72add6Behdad Esfahbod if (info.indic_category() == OT_X && 270df50b8474094f0563ccfdae12c4425a51b72add6Behdad Esfahbod unlikely (hb_in_range<hb_codepoint_t> (info.codepoint, 0x17CB, 0x17D0))) 271df50b8474094f0563ccfdae12c4425a51b72add6Behdad Esfahbod info.indic_category() = OT_RS; 272df50b8474094f0563ccfdae12c4425a51b72add6Behdad Esfahbod 27392332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod if (info.indic_category() == OT_C) { 27492332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = consonant_position (info.codepoint); 27592332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod if (is_ra (info.codepoint)) 27692332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_Ra; 2777d09c98a1fff97127e48eae48d380dc9fcff288eBehdad Esfahbod } else if (info.indic_category() == OT_RS) { 2787d09c98a1fff97127e48eae48d380dc9fcff288eBehdad Esfahbod info.indic_position() = POS_ABOVE_M; 27992332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod } else if (info.indic_category() == OT_SM || 28092332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() == OT_VD) { 28192332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_position() = POS_SMVD; 28292332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod } else if (unlikely (info.codepoint == 0x200C)) 28392332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_ZWNJ; 28492332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod else if (unlikely (info.codepoint == 0x200D)) 28592332e5116271a5d96e532005fe750e7552a6cbbBehdad Esfahbod info.indic_category() = OT_ZWJ; 28618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod else if (unlikely (info.codepoint == 0x25CC)) 28718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod info.indic_category() = OT_DOTTEDCIRCLE; 288b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod } 289743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 290b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 29145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodstatic int 29245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodcompare_indic_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) 29345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod{ 29445d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int a = pa->indic_position(); 29545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int b = pb->indic_position(); 29645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 29745d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod return a < b ? -1 : a == b ? 0 : +1; 29845d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod} 299867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 3007ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod/* Rules from: 3017ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */ 3027ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod 303743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 30470fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbodinitial_reordering_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *basic_mask_array, 305ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 306743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 307ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 308743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 309617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod 310743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 1. Find base consonant: 311743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 312743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The shaping engine finds the base consonant of the syllable, using the 313743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following algorithm: starting from the end of the syllable, move backwards 314743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * until a consonant is found that does not have a below-base or post-base 315743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * form (post-base forms have to follow below-base forms), or that is not a 316743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * pre-base reordering Ra, or arrive at the first consonant. The consonant 317743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * stopped at will be the base. 318743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 319743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o If the syllable starts with Ra + Halant (in a script that has Reph) 320743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 321743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * base consonants. 322743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 323743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 3245e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod unsigned int base = end; 32576b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod bool has_reph = false; 326743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 32776b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod { 328617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 329617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 330617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * base consonants. */ 331617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod unsigned int limit = start; 33270fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod if (basic_mask_array[RPHF] && 333617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod start + 3 <= end && 334617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod info[start].indic_category() == OT_Ra && 335617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod info[start + 1].indic_category() == OT_H && 336617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod !is_joiner (info[start + 2])) 337617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod { 338617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod limit += 2; 339617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod base = start; 340617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod has_reph = true; 341617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod }; 34276b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod 3433c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> starting from the end of the syllable, move backwards */ 3443c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod unsigned int i = end; 3453c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod do { 3463c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod i--; 3473c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> until a consonant is found */ 3483c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (is_consonant (info[i])) 349743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod { 3503c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> that does not have a below-base or post-base form 3513c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * (post-base forms have to follow below-base forms), */ 3523c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (info[i].indic_position() != POS_BELOW_C && 3533c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod info[i].indic_position() != POS_POST_C) 3543c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod { 3553c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = i; 3563c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod break; 3573c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } 358743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 3593c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> or that is not a pre-base reordering Ra, 3603c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * 3613c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * TODO 3623c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod */ 363e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 3643c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod /* -> or arrive at the first consonant. The consonant stopped at will 3653c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod * be the base. */ 3663c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = i; 3673c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } 3683c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod else 3693c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (is_joiner (info[i])) 3703c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod break; 3713c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } while (i > limit); 3723c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (base < start) 3733c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = start; /* Just in case... */ 374743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 375617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod 376617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 377617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 378617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * base consonants. */ 379617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod if (has_reph && base == start) { 380617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* Have no other consonant, so Reph is not formed and Ra becomes base. */ 381617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod has_reph = false; 382617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod } 3835e4e21fce4b548b0b8a5951bc8f35a9f27428192Behdad Esfahbod } 3843d25079f8d6be81b9b4b91d3a97016b8a572f571Behdad Esfahbod 3853d25079f8d6be81b9b4b91d3a97016b8a572f571Behdad Esfahbod 386743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 2. Decompose and reorder Matras: 387743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 388743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Each matra and any syllable modifier sign in the cluster are moved to the 389743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * appropriate position relative to the consonant(s) in the cluster. The 390743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * shaping engine decomposes two- or three-part matras into their constituent 391743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * parts before any repositioning. Matra characters are classified by which 392743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * consonant in a conjunct they have affinity for and are reordered to the 393743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following positions: 394743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 395743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o Before first half form in the syllable 396743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After subjoined consonants 397743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After post-form consonant 398743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After main consonant (for above marks) 399743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 400743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 401743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 402743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The normalize() routine has already decomposed matras for us, so we don't 403743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * need to worry about that. 404743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 405743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 406743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 407743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 3. Reorder marks to canonical order: 408743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 409743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Adjacent nukta and halant or nukta and vedic sign are always repositioned 410743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * if necessary, so that the nukta is first. 411743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 412743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 413743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 414743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * We don't need to do this: the normalize() routine already did this for us. 415743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 416743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 417743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 41845d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Reorder characters */ 41945d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 4203c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < base; i++) 421dbccf87eef0d26838fa4bb3ae26410f6c4818836Behdad Esfahbod info[i].indic_position() = POS_PRE_C; 422dbccf87eef0d26838fa4bb3ae26410f6c4818836Behdad Esfahbod info[base].indic_position() = POS_BASE_C; 42345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 424fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod /* Handle beginning Ra */ 4255e4e21fce4b548b0b8a5951bc8f35a9f27428192Behdad Esfahbod if (has_reph) 426dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start].indic_position() = POS_RA_TO_BECOME_REPH; 427fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod 428f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* For old-style Indic script tags, move the first post-base Halant after 429f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod * last consonant. */ 430a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod if (IS_OLD_INDIC_TAG (map->get_chosen_script (0))) { 4313c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 432f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (info[i].indic_category() == OT_H) { 433f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod unsigned int j; 434f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod for (j = end - 1; j > i; j--) 435190eb31a16178269aecaf5d2ecc9012f956749f4Behdad Esfahbod if (is_consonant (info[j])) 436f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 437f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (j > i) { 438f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* Move Halant to after last consonant. */ 439f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod hb_glyph_info_t t = info[i]; 440f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0])); 441f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod info[j] = t; 442f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 443f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 444f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 445f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 446f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod 44745d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Attach ZWJ, ZWNJ, nukta, and halant to previous char to move with them. */ 448a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (!indic_options ().uniscribe_bug_compatible) 449ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 450ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod /* Please update the Uniscribe branch when touching this! */ 451ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 452ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) 453ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[i - 1].indic_position(); 454ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } else { 45567ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod /* 45667ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod * Uniscribe doesn't move the Halant with Left Matra. 45767ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod * TEST: U+092B,U+093F,U+094DE 45867ea29af49bb08ee679914076808327992cf6676Behdad Esfahbod */ 459ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod /* Please update the non-Uniscribe branch when touching this! */ 460ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 461ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod if ((FLAG (info[i].indic_category()) & (FLAG (OT_ZWNJ) | FLAG (OT_ZWJ) | FLAG (OT_N) | FLAG (OT_H)))) { 462ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[i - 1].indic_position(); 4636a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[i].indic_category() == OT_H && info[i].indic_position() == POS_PRE_M) 464ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int j = i; j > start; j--) 4656a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[j - 1].indic_position() != POS_PRE_M) { 466ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[j - 1].indic_position(); 467ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod break; 468ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 469ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 470ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 47145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 47245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* We do bubble-sort, skip malicious clusters attempts */ 473b99d63ae114fb58f129562b293a8a66543d499adBehdad Esfahbod if (end - start < 64) 474a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod { 475a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod /* Sit tight, rock 'n roll! */ 476d3637edb248162970e202e9d0671540274192844Behdad Esfahbod hb_bubble_sort (info + start, end - start, compare_indic_order); 477a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod /* Find base again */ 478a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod base = end; 4793c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < end; i++) 480a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod if (info[i].indic_position() == POS_BASE_C) { 481a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod base = i; 482a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod break; 483a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod } 484a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod } 48545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 486743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Setup masks now */ 487743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 488281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod { 489281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod hb_mask_t mask; 490281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod 491dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* Reph */ 492668c6046c1b3af3bd316bda0cc8636f2a5e8df42Behdad Esfahbod for (unsigned int i = start; i < end && info[i].indic_position() == POS_RA_TO_BECOME_REPH; i++) 49370fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod info[i].mask |= basic_mask_array[RPHF]; 494dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 495281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Pre-base */ 49670fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod mask = basic_mask_array[HALF] | basic_mask_array[AKHN] | basic_mask_array[CJCT]; 4973c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < base; i++) 498281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 499281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Base */ 50070fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod mask = basic_mask_array[AKHN] | basic_mask_array[CJCT]; 501281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[base].mask |= mask; 502281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Post-base */ 50370fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod mask = basic_mask_array[BLWF] | basic_mask_array[ABVF] | basic_mask_array[PSTF] | basic_mask_array[CJCT]; 5043c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 505281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 506281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod } 5079da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 50817d7de91d76406d3e92db37d9eef2fc615f06e68Behdad Esfahbod /* XXX This will not match for old-Indic spec since the Halant-Ra order is reversed already. */ 5098e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if (basic_mask_array[PREF] && base + 3 <= end) 51017d7de91d76406d3e92db37d9eef2fc615f06e68Behdad Esfahbod { 5118e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod /* Find a Halant,Ra sequence and mark it fore pre-base reordering processing. */ 5128e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod for (unsigned int i = base + 1; i + 1 < end; i++) 5138e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if (info[i].indic_category() == OT_H && 5148e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod info[i + 1].indic_category() == OT_Ra) 5158e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod { 5168e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod info[i].mask |= basic_mask_array[PREF]; 5178e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod info[i + 1].mask |= basic_mask_array[PREF]; 5188e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod break; 5198e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod } 52017d7de91d76406d3e92db37d9eef2fc615f06e68Behdad Esfahbod } 52117d7de91d76406d3e92db37d9eef2fc615f06e68Behdad Esfahbod 5229da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod /* Apply ZWJ/ZWNJ effects */ 5233c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 5249da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod if (is_joiner (info[i])) { 5259da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod bool non_joiner = info[i].indic_category() == OT_ZWNJ; 5266b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod unsigned int j = i; 5279da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 5289da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod do { 5299da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod j--; 5306b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 53170fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod info[j].mask &= ~basic_mask_array[CJCT]; 5326b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod if (non_joiner) 53370fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod info[j].mask &= ~basic_mask_array[HALF]; 5346b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 5359da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } while (j > start && !is_consonant (info[j])); 5369da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } 537743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 538743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 539743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 540743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 5419f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_vowel_syllable (const hb_ot_map_t *map, 5429f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 54370fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod hb_mask_t *basic_mask_array, 544ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 545743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 546c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod /* We made the vowels look like consonants. So let's call the consonant logic! */ 54770fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod initial_reordering_consonant_syllable (map, buffer, basic_mask_array, start, end); 548743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 549743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 550743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 5519f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_standalone_cluster (const hb_ot_map_t *map, 5529f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 55370fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod hb_mask_t *basic_mask_array, 554ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 555743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 55618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod /* We treat NBSP/dotted-circle as if they are consonants, so we should just chain. 55718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * Only if not in compatibility mode that is... */ 55818c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod 559a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (indic_options ().uniscribe_bug_compatible) 56018c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod { 56118c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod /* For dotted-circle, this is what Uniscribe does: 56218c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * If dotted-circle is the last glyph, it just does nothing. 56318c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * Ie. It doesn't form Reph. */ 56418c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod if (buffer->info[end - 1].indic_category() == OT_DOTTEDCIRCLE) 56518c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod return; 56618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod } 56718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod 56870fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod initial_reordering_consonant_syllable (map, buffer, basic_mask_array, start, end); 569743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 570743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 571743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 5729f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_non_indic (const hb_ot_map_t *map HB_UNUSED, 5739f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer HB_UNUSED, 57470fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod hb_mask_t *basic_mask_array HB_UNUSED, 5753f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod unsigned int start HB_UNUSED, unsigned int end HB_UNUSED) 576743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 577743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Nothing to do right now. If we ever switch to using the output 578743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * buffer in the reordering process, we'd need to next_glyph() here. */ 579743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 580743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 581743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod#include "hb-ot-shape-complex-indic-machine.hh" 582743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 583743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 584743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 5853f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod hb_face_t *face HB_UNUSED, 586743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 587743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED) 588743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 58970fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod hb_mask_t basic_mask_array[ARRAY_LENGTH (indic_basic_features)] = {0}; 590b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod unsigned int num_masks = ARRAY_LENGTH (indic_basic_features); 591b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < num_masks; i++) 59270fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod basic_mask_array[i] = map->get_1_mask (indic_basic_features[i].tag); 593743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 59470fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod find_syllables (map, buffer, basic_mask_array); 595b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 596b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 597743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 59846e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbodfinal_reordering_syllable (hb_buffer_t *buffer, 59946e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod hb_mask_t init_mask, hb_mask_t pref_mask, 600ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 601743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 6024ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod hb_glyph_info_t *info = buffer->info; 6034ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 604e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod /* 4. Final reordering: 605e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 606e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * After the localized forms and basic shaping forms GSUB features have been 607e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * applied (see below), the shaping engine performs some final glyph 608e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * reordering before applying all the remaining font features to the entire 609e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * cluster. 6104ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod */ 6114ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 6124ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* Find base again */ 6134ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod unsigned int base = end; 6144ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod for (unsigned int i = start; i < end; i++) 6154ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod if (info[i].indic_position() == POS_BASE_C) { 6164ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod base = i; 6174ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod break; 6184ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 6194ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 6204705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod unsigned int start_of_last_cluster = base; 6214705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod 6224ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* o Reorder matras: 623e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 624e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base matra character had been reordered before applying basic 625e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * features, the glyph can be moved closer to the main consonant based on 626e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * whether half-forms had been formed. Actual position for the matra is 627e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * defined as “after last standalone halant glyph, after initial matra 628e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * position and before the main consonant”. If ZWJ or ZWNJ follow this 629e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * halant, position is moved after it. 6304ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod */ 6314ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 632362d3db8d3527d0fef260a17d2466e92a4a25425Behdad Esfahbod if (start < base) /* Otherwise there can't be any pre-base matra characters. */ 6339d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod { 634921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod unsigned int new_pos = base - 1; 635921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod while (new_pos > start && 636921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod !(FLAG (info[new_pos].indic_category()) & (FLAG (OT_M) | FLAG (OT_H)))) 637921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod new_pos--; 6389d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* If we found no Halant we are done. Otherwise only proceed if the Halant does 6399d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod * not belong to the Matra itself! */ 640921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod if (info[new_pos].indic_category() == OT_H && 641921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod info[new_pos].indic_position() != POS_PRE_M) { 6429d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 643921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod if (new_pos + 1 < end && is_joiner (info[new_pos + 1])) 644921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod new_pos++; 6459d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod 6469d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* Now go see if there's actually any matras... */ 647921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod for (unsigned int i = new_pos; i > start; i--) 6486a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[i - 1].indic_position () == POS_PRE_M) 6499d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod { 6501a1dbe9a2787f226f3e43063da8eb6633438b0a0Behdad Esfahbod unsigned int old_pos = i - 1; 6511a1dbe9a2787f226f3e43063da8eb6633438b0a0Behdad Esfahbod hb_glyph_info_t tmp = info[old_pos]; 6521a1dbe9a2787f226f3e43063da8eb6633438b0a0Behdad Esfahbod memmove (&info[old_pos], &info[old_pos + 1], (new_pos - old_pos) * sizeof (info[0])); 6531a1dbe9a2787f226f3e43063da8eb6633438b0a0Behdad Esfahbod info[new_pos] = tmp; 654921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod start_of_last_cluster = MIN (new_pos, start_of_last_cluster); 655921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod new_pos--; 6569d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod } 6579d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod } 6584ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 6594ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 6604ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 6614ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* o Reorder reph: 662e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 663e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Reph’s original position is always at the beginning of the syllable, 664e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * (i.e. it is not reordered at the character reordering stage). However, 665e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * it will be reordered according to the basic-forms shaping results. 666e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Possible positions for reph, depending on the script, are; after main, 667e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * before post-base consonant forms, and after post-base consonant forms. 668dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod */ 669dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 670dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* If there's anything after the Ra that has the REPH pos, it ought to be halant. 671dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * Which means that the font has failed to ligate the Reph. In which case, we 672dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * shouldn't move. */ 673dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod if (start + 1 < end && 674dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start].indic_position() == POS_RA_TO_BECOME_REPH && 675dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start + 1].indic_position() != POS_RA_TO_BECOME_REPH) 676dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod { 67702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod unsigned int new_reph_pos; 67802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 67902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod enum reph_position_t { 680f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_AFTER_MAIN, 681f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_BEFORE_SUBSCRIPT, 682f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_AFTER_SUBSCRIPT, 683f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_BEFORE_POSTSCRIPT, 6849fc7a11469113d31d8095757c4fc038c3427d44aBehdad Esfahbod REPH_AFTER_POSTSCRIPT 685f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod } reph_pos; 686f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 687f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod /* XXX Figure out old behavior too */ 6887f852b644b8143492a02edfc853114aaa23446bdBehdad Esfahbod switch ((hb_tag_t) buffer->props.script) 689f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod { 690f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_MALAYALAM: 691f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_ORIYA: 692f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_MAIN; 693f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 694f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 695f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_GURMUKHI: 696f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_BEFORE_SUBSCRIPT; 697f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 698f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 699f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_BENGALI: 700f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_SUBSCRIPT; 701f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 702f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 703f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod default: 704f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_DEVANAGARI: 705f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_GUJARATI: 706f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_BEFORE_POSTSCRIPT; 707f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 708f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 709f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_KANNADA: 710f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_TAMIL: 711f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_TELUGU: 712f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_POSTSCRIPT; 713f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 714f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod } 71502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 716dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* 1. If reph should be positioned after post-base consonant forms, 717dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * proceed to step 5. 71802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 7199d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_POSTSCRIPT) 72002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 7219d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod goto reph_step_5; 72202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 72302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 72402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 2. If the reph repositioning class is not after post-base: target 725dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * position is after the first explicit halant glyph between the 726dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first post-reph consonant and last main consonant. If ZWJ or ZWNJ 727dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * are following this halant, position is moved after it. If such 728dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * position is found, this is the target position. Otherwise, 729dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * proceed to the next step. 730dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * 731dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * Note: in old-implementation fonts, where classifications were 732dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * fixed in shaping engine, there was no case where reph position 733dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * will be found on this step. 73402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 73502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 73602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos = start + 1; 73702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod while (new_reph_pos < base && info[new_reph_pos].indic_category() != OT_H) 73802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos++; 73902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 74002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (new_reph_pos < base && info[new_reph_pos].indic_category() == OT_H) { 74102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 74202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 74302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos++; 74402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_move; 74502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 74602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 74702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 74802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 3. If reph should be repositioned after the main consonant: find the 749dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first consonant not ligated with main, or find the first 750dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * consonant that is not a potential pre-base reordering Ra. 75102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 7529d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_MAIN) 75302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 754b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod new_reph_pos = base; 755b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod /* XXX Skip potential pre-base reordering Ra. */ 756b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod while (new_reph_pos < end && 757b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod !( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_BELOW_C) | FLAG (POS_POST_C) | FLAG (POS_POST_M) | FLAG (POS_SMVD)))) 758b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod new_reph_pos++; 759b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod if (new_reph_pos < end) 760b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod goto reph_move; 76102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 76202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 76302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 4. If reph should be positioned before post-base consonant, find 764dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first post-base classified consonant not ligated with main. If no 765dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * consonant is found, the target position should be before the 766dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first matra, syllable modifier sign or vedic sign. 76702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 7689d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* This is our take on what step 4 is trying to say (and failing, BADLY). */ 7699d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_SUBSCRIPT) 77002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 7719d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_reph_pos = base; 7729d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod while (new_reph_pos < end && 7736a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod !( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_POST_C) | FLAG (POS_POST_M) | FLAG (POS_SMVD)))) 7749d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_reph_pos++; 7759d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (new_reph_pos < end) 7769d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod goto reph_move; 77702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 77802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 77902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 5. If no consonant is found in steps 3 or 4, move reph to a position 780dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * immediately before the first post-base matra, syllable modifier 781dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * sign or vedic sign that has a reordering class after the intended 782dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * reph position. For example, if the reordering position for reph 783dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * is post-main, it will skip above-base matras that also have a 784dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * post-main position. 785dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod */ 78602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_5: 78702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 78802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* XXX */ 78902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 790dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 79102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 6. Otherwise, reorder reph to the end of the syllable. 79202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 79302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 79402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos = end - 1; 79502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod while (new_reph_pos > start && info[new_reph_pos].indic_position() == POS_SMVD) 79602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos--; 79702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 798892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod /* 799892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * If the Reph is to be ending up after a Matra,Halant sequence, 800892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * position it before that Halant so it can interact with the Matra. 801892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * However, if it's a plain Consonant,Halant we shouldn't do that. 802892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * Uniscribe doesn't do this. 803892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * TEST: U+0930,U+094D,U+0915,U+094B,U+094D 804892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod */ 805a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (!indic_options ().uniscribe_bug_compatible && 806892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod unlikely (info[new_reph_pos].indic_category() == OT_H)) { 80702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod for (unsigned int i = base + 1; i < new_reph_pos; i++) 80802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (info[i].indic_category() == OT_M) { 80902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* Ok, got it. */ 81002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos--; 81102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 81202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 81302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_move; 8148df5636968389ac7bf8620ccd091fd4872b0bbeeBehdad Esfahbod } 8158df5636968389ac7bf8620ccd091fd4872b0bbeeBehdad Esfahbod 81602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_move: 81702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 81802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* Move */ 81902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod hb_glyph_info_t reph = info[start]; 82002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod memmove (&info[start], &info[start + 1], (new_reph_pos - start) * sizeof (info[0])); 82102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod info[new_reph_pos] = reph; 82202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod start_of_last_cluster = start; /* Yay, one big cluster! */ 82302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 824dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod } 825dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 826dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 827dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* o Reorder pre-base reordering consonants: 828e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 829e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base reordering consonant is found, reorder it according to 830e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * the following rules: 831e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod */ 832e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 83346e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod if (pref_mask && base + 1 < end) /* Otherwise there can't be any pre-base reordering Ra. */ 83446e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod { 8358e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 8368e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if ((info[i].mask & pref_mask) != 0) 83778818124b17691ec2c647142fdb9ae743aa03deeBehdad Esfahbod { 8388e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod /* 1. Only reorder a glyph produced by substitution during application 8398e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * of the <pref> feature. (Note that a font may shape a Ra consonant with 8408e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * the feature generally but block it in certain contexts.) 8418e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod */ 8428e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if (i + 1 == end || (info[i + 1].mask & pref_mask) == 0) 8438e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod { 8448e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod /* 8458e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * 2. Try to find a target position the same way as for pre-base matra. 8468e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * If it is found, reorder pre-base consonant glyph. 8478e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * 8488e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * 3. If position is not found, reorder immediately before main 8498e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * consonant. 8508e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod */ 8518e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod 8528e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod unsigned int new_pos = base; 8538e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod while (new_pos > start + 1 && 8548e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod !(FLAG (info[new_pos - 1].indic_category()) & (FLAG (OT_M) | FLAG (OT_H)))) 8558e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod new_pos--; 8568e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod 8578e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if (new_pos > start && info[new_pos - 1].indic_category() == OT_H) 8588e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 8598e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if (new_pos < end && is_joiner (info[new_pos])) 8608e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod new_pos++; 8618e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod 8628e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod { 8638e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod unsigned int old_pos = i; 8648e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod hb_glyph_info_t tmp = info[old_pos]; 8658e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod memmove (&info[new_pos + 1], &info[new_pos], (old_pos - new_pos) * sizeof (info[0])); 8668e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod info[new_pos] = tmp; 8678e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod start_of_last_cluster = MIN (new_pos, start_of_last_cluster); 8688e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod } 8698e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod } 8708e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod 8718e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod break; 87278818124b17691ec2c647142fdb9ae743aa03deeBehdad Esfahbod } 87346e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod } 874eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 875eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 876a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod /* Apply 'init' to the Left Matra if it's a word start. */ 8776a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[start].indic_position () == POS_PRE_M && 878a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod (!start || 879eace47b173807d94b29a6490d0bc3c9f8f6168d1Behdad Esfahbod !(FLAG (_hb_glyph_info_get_general_category (&info[start - 1])) & 880a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod (FLAG (HB_UNICODE_GENERAL_CATEGORY_LOWERCASE_LETTER) | 881a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_MODIFIER_LETTER) | 882a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_OTHER_LETTER) | 883a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_TITLECASE_LETTER) | 884a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_UPPERCASE_LETTER) | 885a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | 886a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | 887a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK))))) 88846e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod info[start].mask |= init_mask; 889a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod 890eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 89121d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 89221d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod /* Finish off the clusters and go home! */ 89321d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 894a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (!indic_options ().uniscribe_bug_compatible) 895ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 89621d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod /* This is what Uniscribe does. Ie. add cluster boundaries after Halant,ZWNJ. 89721d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * This means, half forms are submerged into the main consonants cluster. 89821d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * This is unnecessary, and makes cursor positioning harder, but that's what 89921d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * Uniscribe does. */ 90021d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod unsigned int cluster_start = start; 90121d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod for (unsigned int i = start + 1; i < start_of_last_cluster; i++) 90221d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod if (info[i - 1].indic_category() == OT_H && info[i].indic_category() == OT_ZWNJ) { 90321d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod i++; 90421d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod buffer->merge_clusters (cluster_start, i); 90521d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod cluster_start = i; 90621d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod } 90721d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod start_of_last_cluster = cluster_start; 90821d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod } 90921d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 91021d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod buffer->merge_clusters (start_of_last_cluster, end); 911ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod} 912e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 913e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 914ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodstatic void 915ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 9163f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod hb_face_t *face HB_UNUSED, 917ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_buffer_t *buffer, 918ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod void *user_data HB_UNUSED) 919ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod{ 920ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int count = buffer->len; 921ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod if (!count) return; 922ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod 92346e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod hb_mask_t init_mask = map->get_1_mask (HB_TAG('i','n','i','t')); 92446e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod hb_mask_t pref_mask = map->get_1_mask (HB_TAG('p','r','e','f')); 925eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 926ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 927ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int last = 0; 928cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod unsigned int last_syllable = info[0].syllable(); 929ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod for (unsigned int i = 1; i < count; i++) 930cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod if (last_syllable != info[i].syllable()) { 93146e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod final_reordering_syllable (buffer, init_mask, pref_mask, last, i); 932ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod last = i; 933cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod last_syllable = info[last].syllable(); 934ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod } 93546e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod final_reordering_syllable (buffer, init_mask, pref_mask, last, count); 936e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 937743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); 938743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); 939743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 940743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 941743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 942b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 943