hb-ot-shape-complex-indic.cc revision 81202bd860e4034c18d9f80c5a4f33d9f48463a3
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 90f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbodstatic bool 91f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbodwould_substitute (hb_codepoint_t *glyphs, unsigned int glyphs_count, 92f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod hb_tag_t feature_tag, hb_ot_map_t *map, hb_face_t *face) 93743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 94f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod unsigned int lookup_indices[32]; 95f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod unsigned int offset, len; 96f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod 97f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod offset = 0; 98f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod do { 99f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod len = ARRAY_LENGTH (lookup_indices); 100f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod hb_ot_layout_feature_get_lookup_indexes (face, HB_OT_TAG_GSUB, 101f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod map->get_feature_index (0/*GSUB*/, feature_tag), 102f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod offset, 103f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod &len, 104f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod lookup_indices); 105f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod 106f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod for (unsigned int i = 0; i < len; i++) 107f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod if (hb_ot_layout_would_substitute_lookup (face, glyphs, glyphs_count, lookup_indices[i])) 108f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod return true; 109f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod 110f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod offset += len; 111f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod } while (len == ARRAY_LENGTH (lookup_indices)); 112f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod 113f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod return false; 114f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod} 115743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 116f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbodstatic indic_position_t 117f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbodconsonant_position (hb_codepoint_t u, hb_ot_map_t *map, hb_font_t *font) 118f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod{ 1195249f3aee108b0f41770d137e63a625f594418e7Behdad Esfahbod if ((u & ~0x007F) == 0x1780) 1205249f3aee108b0f41770d137e63a625f594418e7Behdad Esfahbod return POS_BELOW_C; /* In Khmer coeng model, all are subjoining. */ 1215249f3aee108b0f41770d137e63a625f594418e7Behdad Esfahbod 122f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod hb_codepoint_t virama = (u & ~0x007F) | 0x004D; 123f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod if ((u & ~0x007F) == 0x0D80) virama = 0x0DCA; /* Sinahla */ 124f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod hb_codepoint_t glyphs[2]; 125f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod 12651e764de441072e7c9f67de23e8ed717b9b8957dBehdad Esfahbod unsigned int virama_pos = IS_OLD_INDIC_TAG (map->get_chosen_script (0)) ? 1 : 0; 12751e764de441072e7c9f67de23e8ed717b9b8957dBehdad Esfahbod hb_font_get_glyph (font, virama, 0, &glyphs[virama_pos]); 12851e764de441072e7c9f67de23e8ed717b9b8957dBehdad Esfahbod hb_font_get_glyph (font, u, 0, &glyphs[1-virama_pos]); 129f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod 130f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod hb_face_t *face = hb_font_get_face (font); 131f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod if (would_substitute (glyphs, ARRAY_LENGTH (glyphs), HB_TAG('p','r','e','f'), map, face)) return POS_BELOW_C; 132f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod if (would_substitute (glyphs, ARRAY_LENGTH (glyphs), HB_TAG('b','l','w','f'), map, face)) return POS_BELOW_C; 133f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod if (would_substitute (glyphs, ARRAY_LENGTH (glyphs), HB_TAG('p','s','t','f'), map, face)) return POS_POST_C; 134f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod return POS_BASE_C; 135743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 136743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 1378bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod#define MATRA_POS_LEFT(u) POS_PRE_M 1388c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod#define MATRA_POS_RIGHT(u) ( \ 1398c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_DEVA(u) ? POS_AFTER_SUB : \ 1408c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_BENG(u) ? POS_AFTER_POST : \ 1418c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_GURM(u) ? POS_AFTER_POST : \ 1428c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_GUJA(u) ? POS_AFTER_POST : \ 1438c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_ORYA(u) ? POS_AFTER_POST : \ 1448c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_TAML(u) ? POS_AFTER_POST : \ 145fa247ebe524f92fa95d344ba912f704262879c13Behdad Esfahbod IS_TELU(u) ? (u <= 0x0C42 ? POS_BEFORE_SUB : POS_AFTER_SUB) : \ 14687cd63266e73af316b250573ef57388a0bcc9133Behdad Esfahbod IS_KNDA(u) ? (u < 0x0CC3 || u > 0xCD6 ? POS_BEFORE_SUB : POS_AFTER_SUB) : \ 1478c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_MLYM(u) ? POS_AFTER_POST : \ 1488c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_SINH(u) ? POS_AFTER_SUB : \ 1498c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod /*default*/ POS_AFTER_SUB \ 1508c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod ) 1518c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod#define MATRA_POS_TOP(u) ( /* BENG and MLYM don't have top matras. */ \ 1528c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_DEVA(u) ? POS_AFTER_SUB : \ 1538c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_GURM(u) ? POS_AFTER_SUB : \ 1548c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_GUJA(u) ? POS_AFTER_SUB : \ 1558c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_ORYA(u) ? POS_AFTER_MAIN : \ 1568c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_TAML(u) ? POS_AFTER_SUB : \ 1578c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_TELU(u) ? POS_BEFORE_SUB : \ 1588c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_KNDA(u) ? POS_BEFORE_SUB : \ 1598c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_SINH(u) ? POS_AFTER_SUB : \ 1608c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod /*default*/ POS_AFTER_SUB \ 1618c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod ) 1628c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod#define MATRA_POS_BOTTOM(u) ( \ 1638c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_DEVA(u) ? POS_AFTER_SUB : \ 1648c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_BENG(u) ? POS_AFTER_SUB : \ 1658c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_GURM(u) ? POS_AFTER_POST : \ 1668c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_GUJA(u) ? POS_AFTER_POST : \ 1678c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_ORYA(u) ? POS_AFTER_SUB : \ 1688c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_TAML(u) ? POS_AFTER_POST : \ 1698c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_TELU(u) ? POS_BEFORE_SUB : \ 1708c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_KNDA(u) ? POS_BEFORE_SUB : \ 1718c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_MLYM(u) ? POS_AFTER_POST : \ 1728c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod IS_SINH(u) ? POS_AFTER_SUB : \ 1738c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod /*default*/ POS_AFTER_SUB \ 1748c973ebf0f59abb5ee920edd5d64e23d8e47ad75Behdad Esfahbod ) 1758bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 1768bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 1778bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbodstatic indic_position_t 1788bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbodmatra_position (hb_codepoint_t u, indic_position_t side) 1798bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod{ 1808bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod switch ((int) side) 1818bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod { 1828bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod case POS_PRE_C: return MATRA_POS_LEFT (u); 1838bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod case POS_POST_C: return MATRA_POS_RIGHT (u); 1848bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod case POS_ABOVE_C: return MATRA_POS_TOP (u); 1858bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod case POS_BELOW_C: return MATRA_POS_BOTTOM (u); 1868bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod }; 1878bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod abort (); 1888bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod} 1898bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 190352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbodstatic bool 191352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbodis_ra (hb_codepoint_t u) 192352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod{ 193352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod return !!bsearch (&u, ra_chars, 194352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod ARRAY_LENGTH (ra_chars), 195352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod sizeof (ra_chars[0]), 196352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod compare_codepoint); 197352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod} 198352372ae5ea0998e40cf9fe43c22b6b610a5764eBehdad Esfahbod 1999ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod#define JOINER_FLAGS (FLAG (OT_ZWJ) | FLAG (OT_ZWNJ)) 2009ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbodstatic bool 2019da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodis_joiner (const hb_glyph_info_t &info) 2029ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod{ 2039ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod return !!(FLAG (info.indic_category()) & JOINER_FLAGS); 2049da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod} 2059da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 2069ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod#define CONSONANT_FLAGS (FLAG (OT_C) | FLAG (OT_Ra) | FLAG (OT_V) | FLAG (OT_NBSP) | FLAG (OT_DOTTEDCIRCLE)) 2079da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodstatic bool 2089da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbodis_consonant (const hb_glyph_info_t &info) 2099da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod{ 2101a1fa8c655a082fc1439608457ba717306cc83caBehdad Esfahbod /* Note: 2111a1fa8c655a082fc1439608457ba717306cc83caBehdad Esfahbod * 21218c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * We treat Vowels and placeholders as if they were consonants. This is safe because Vowels 213c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod * cannot happen in a consonant syllable. The plus side however is, we can call the 214c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod * consonant syllable logic from the vowel syllable function and get it all right! */ 2159ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod return !!(FLAG (info.indic_category()) & CONSONANT_FLAGS); 2169ee27a928a989c71923cef82a9e9828f8e9ca051Behdad Esfahbod} 217c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod 2189ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod#define HALANT_OR_COENG_FLAGS (FLAG (OT_H) | FLAG (OT_Coeng)) 219deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbodstatic bool 220deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbodis_halant_or_coeng (const hb_glyph_info_t &info) 221deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod{ 2229ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod return !!(FLAG (info.indic_category()) & HALANT_OR_COENG_FLAGS); 223deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod} 224deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod 2259ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbodstatic inline void 226f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbodset_indic_properties (hb_glyph_info_t &info, hb_ot_map_t *map, hb_font_t *font) 2279ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod{ 2289ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod hb_codepoint_t u = info.codepoint; 2299ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod unsigned int type = get_indic_categories (u); 2308bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2318bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2328bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod /* 2338bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod * Assign category 2348bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod */ 2358bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2368bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod indic_category_t cat = (indic_category_t) (type & 0x0F); 2379ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 2389ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod /* The spec says U+0952 is OT_A. However, testing shows that Uniscribe 2399ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * treats U+0951..U+0952 all as OT_VD. 2409ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * TESTS: 2419ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * U+092E,U+0947,U+0952 2429ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * U+092E,U+0952,U+0947 2439ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * U+092E,U+0947,U+0951 2449ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * U+092E,U+0951,U+0947 2459ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * */ 2469ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod if (unlikely (hb_in_range<hb_codepoint_t> (u, 0x0951, 0x0954))) 2479ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod cat = OT_VD; 2489ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 2499ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod if (cat == OT_X && 2509ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod unlikely (hb_in_range<hb_codepoint_t> (u, 0x17CB, 0x17D2))) /* Khmer Various signs */ 2519ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod cat = OT_N; 2529ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 2538bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod if (unlikely (u == 0x17D2)) cat = OT_Coeng; /* Khmer coeng */ 2548bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod else if (unlikely (u == 0x200C)) cat = OT_ZWNJ; 2558bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod else if (unlikely (u == 0x200D)) cat = OT_ZWJ; 2568bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod else if (unlikely (u == 0x25CC)) cat = OT_DOTTEDCIRCLE; 2573604d64ced909ade91998d294a7b4b2ee14d47aaBehdad Esfahbod else if (unlikely (u == 0x0A71)) cat = OT_SM; /* GURMUKHI ADDAK. More like consonant medial. like 0A75. */ 2589ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 2599ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod if (cat == OT_Repha) { 2609ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod /* There are two kinds of characters marked as Repha: 2619ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * - The ones that are GenCat=Mn are already positioned visually, ie. after base. (eg. Khmer) 2629ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * - The ones that are GenCat=Lo is encoded logically, ie. beginning of syllable. (eg. Malayalam) 2639ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * 2649ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod * We recategorize the first kind to look like a Nukta and attached to the base directly. 2659ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod */ 2669ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod if (_hb_glyph_info_get_general_category (&info) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) 2679ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod cat = OT_N; 2689ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod } 2699ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 2709ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 2718bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2728bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2738bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod /* 2748bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod * Assign position. 2758bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod */ 2768bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2778bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod indic_position_t pos = (indic_position_t) (type >> 4); 2788bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2798bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod if ((FLAG (cat) & CONSONANT_FLAGS)) 2808bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod { 281f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod pos = consonant_position (u, map, font); 2829ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod if (is_ra (u)) 2839ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod cat = OT_Ra; 2848bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod } 2858bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod else if (cat == OT_M) 2868bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod { 2878bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod pos = matra_position (u, pos); 2888bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod } 2898bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod else if (cat == OT_SM || cat == OT_VD) 2908bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod { 2919ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod pos = POS_SMVD; 2928bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod } 2938bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2948bb32458f95f13f66688e0811cc91f1bfffb867dBehdad Esfahbod 2959ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 2969ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod info.indic_category() = cat; 2979ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod info.indic_position() = pos; 2989ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod} 2999ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 3009ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 3019ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 3029ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 3039ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 3049ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 3059ccc6382ba43760167c134c18c1c4ada4b8c3f22Behdad Esfahbod 306eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstruct feature_list_t { 307c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod hb_tag_t tag; 308c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod hb_bool_t is_global; 309eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod}; 310eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 311d5c4edcdd6df32f2f23aca44f14838b4baab4d7aBehdad Esfahbod/* These features are applied one at a time, given the order in this table. */ 312eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstatic const feature_list_t 313eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodindic_basic_features[] = 314b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 315c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('n','u','k','t'), true}, 316e0475345d5d7db8dbc8b554beedfa2435c5d7fd1Behdad Esfahbod {HB_TAG('a','k','h','n'), true}, 317c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('r','p','h','f'), false}, 3181ac075b227090a9ad930dcc1670236c176b27067Behdad Esfahbod {HB_TAG('r','k','r','f'), true}, 319c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('p','r','e','f'), false}, 320c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('b','l','w','f'), false}, 321c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('h','a','l','f'), false}, 32229f106d7fba25e1464debd3a4831a7380d75c4c9Behdad Esfahbod {HB_TAG('a','b','v','f'), false}, 323c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod {HB_TAG('p','s','t','f'), false}, 3240201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod {HB_TAG('c','f','a','r'), false}, 32520b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod {HB_TAG('c','j','c','t'), true}, 3261d6846db9ebf84561bb30a4e48c6c43184914099Behdad Esfahbod {HB_TAG('v','a','t','u'), true}, 327c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod}; 328c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod 329c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod/* Same order as the indic_basic_features array */ 330c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbodenum { 331c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod _NUKT, 332e0475345d5d7db8dbc8b554beedfa2435c5d7fd1Behdad Esfahbod _AKHN, 333c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod RPHF, 334df6d45c693c417bf311e6fa49f18a8558542e525Behdad Esfahbod _RKRF, 335c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod PREF, 336c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod BLWF, 337c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod HALF, 33829f106d7fba25e1464debd3a4831a7380d75c4c9Behdad Esfahbod ABVF, 339c7fe56a1d5d3e969b6ec51cd9ecd471706a19568Behdad Esfahbod PSTF, 3400201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod CFAR, 34120b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod _CJCT, 3421d6846db9ebf84561bb30a4e48c6c43184914099Behdad Esfahbod VATU 343b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod}; 344b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 345d5c4edcdd6df32f2f23aca44f14838b4baab4d7aBehdad Esfahbod/* These features are applied all at once. */ 346eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodstatic const feature_list_t 347eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbodindic_other_features[] = 348b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 349eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('i','n','i','t'), false}, 350eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('p','r','e','s'), true}, 351eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('a','b','v','s'), true}, 352eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('b','l','w','s'), true}, 353eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('p','s','t','s'), true}, 354eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('h','a','l','n'), true}, 355eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 356eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('d','i','s','t'), true}, 357eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('a','b','v','m'), true}, 358eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod {HB_TAG('b','l','w','m'), true}, 359eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod}; 360eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 361743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 362743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 363743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 364743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_face_t *face, 365743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 366743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 367f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodstatic void 368f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 369f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_face_t *face, 370f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod hb_buffer_t *buffer, 371743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED); 372b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 373b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 3749f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod_hb_ot_shape_complex_collect_features_indic (hb_ot_map_builder_t *map, 3759f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod const hb_segment_properties_t *props HB_UNUSED) 376b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 377f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('l','o','c','l')); 378a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod /* The Indic specs do not require ccmp, but we apply it here since if 379a54a5505a35eef5315a8e2e7a79502901e3eff5fBehdad Esfahbod * there is a use of it, it's typically at the beginning. */ 380f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_bool_feature (HB_TAG('c','c','m','p')); 381f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 382743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod map->add_gsub_pause (initial_reordering, NULL); 383f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 384412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_basic_features); i++) { 38576f76812ac7cca8ac6935952a2360d5e151480faBehdad Esfahbod map->add_bool_feature (indic_basic_features[i].tag, indic_basic_features[i].is_global); 386412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod map->add_gsub_pause (NULL, NULL); 387412b91889d9a1ae477e8b6907d0b9a76e78a6c91Behdad Esfahbod } 388b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 389f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod map->add_gsub_pause (final_reordering, NULL); 390f6fd3780e12b23ff7ed3743497c8996e71dcb064Behdad Esfahbod 391d5c4edcdd6df32f2f23aca44f14838b4baab4d7aBehdad Esfahbod for (unsigned int i = 0; i < ARRAY_LENGTH (indic_other_features); i++) 392eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod map->add_bool_feature (indic_other_features[i].tag, indic_other_features[i].is_global); 393b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 394b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 395d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbodvoid 396d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod_hb_ot_shape_complex_override_features_indic (hb_ot_map_builder_t *map, 397d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod const hb_segment_properties_t *props HB_UNUSED) 398d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod{ 399af92b4cc90e4184d5bdd8037c551ed482700114fBehdad Esfahbod /* Uniscribe does not apply 'kern'. */ 400af92b4cc90e4184d5bdd8037c551ed482700114fBehdad Esfahbod if (indic_options ().uniscribe_bug_compatible) 401af92b4cc90e4184d5bdd8037c551ed482700114fBehdad Esfahbod map->add_feature (HB_TAG('k','e','r','n'), 0, true); 402d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod} 403d96838ef951ce6170eb2dc576ebcba2262cf7008Behdad Esfahbod 404867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 40511138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbodhb_ot_shape_normalization_mode_t 40611138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod_hb_ot_shape_complex_normalization_preference_indic (void) 40702cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod{ 40802cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod /* We want split matras decomposed by the common shaping logic. */ 40911138ccff71f442da1fcf64faa0e1d22e083e775Behdad Esfahbod return HB_OT_SHAPE_NORMALIZATION_MODE_DECOMPOSED; 41002cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod} 41102cdf743c2ec345a44d4fcf865594b6ac13fccd0Behdad Esfahbod 412867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 413b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbodvoid 414f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod_hb_ot_shape_complex_setup_masks_indic (hb_ot_map_t *map, 4159f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 416f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod hb_font_t *font) 417b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod{ 4189f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_category); 4199f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod HB_BUFFER_ALLOCATE_VAR (buffer, indic_position); 4209f9bcceca6321d5a5812f878de1de39901349a78Behdad Esfahbod 421743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* We cannot setup masks here. We save information about characters 422743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and setup masks later on in a pause-callback. */ 423743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 424743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod unsigned int count = buffer->len; 425b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < count; i++) 426f055442716ec7543ed156d4789955b19c11a5255Behdad Esfahbod set_indic_properties (buffer->info[i], map, font); 427743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 428b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 42945d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodstatic int 43045d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbodcompare_indic_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) 43145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod{ 43245d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int a = pa->indic_position(); 43345d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod int b = pb->indic_position(); 43445d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 43545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod return a < b ? -1 : a == b ? 0 : +1; 43645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod} 437867361c3ad39629a8d5b7dc48d558a1c19e37d43Behdad Esfahbod 4387ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod/* Rules from: 4397ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */ 4407ea58db311bfb0d8f804d1e9f4a1f004bd45075aBehdad Esfahbod 441743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 44270fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbodinitial_reordering_consonant_syllable (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *basic_mask_array, 443ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 444743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 445ee58f3bc75d2d071a71b94063bf12205a5871acbBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 446743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 447617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod 448743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 1. Find base consonant: 449743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 450743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The shaping engine finds the base consonant of the syllable, using the 451743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following algorithm: starting from the end of the syllable, move backwards 452743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * until a consonant is found that does not have a below-base or post-base 453743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * form (post-base forms have to follow below-base forms), or that is not a 454743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * pre-base reordering Ra, or arrive at the first consonant. The consonant 455743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * stopped at will be the base. 456743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 457743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o If the syllable starts with Ra + Halant (in a script that has Reph) 458743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 459743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * base consonants. 460743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 461743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 4625e72071062c015237b79fbd0521341a63166a204Behdad Esfahbod unsigned int base = end; 46376b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod bool has_reph = false; 464743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 46576b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod { 466617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 467617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 468617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * base consonants. */ 469617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod unsigned int limit = start; 47070fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod if (basic_mask_array[RPHF] && 471617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod start + 3 <= end && 472617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod info[start].indic_category() == OT_Ra && 473617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod info[start + 1].indic_category() == OT_H && 474f31d97e44eeb6fb141f3de928e27e033fc7b1f47Behdad Esfahbod (unlikely (buffer->props.script == HB_SCRIPT_SINHALA || buffer->props.script == HB_SCRIPT_TELUGU) ? 475f31d97e44eeb6fb141f3de928e27e033fc7b1f47Behdad Esfahbod info[start + 2].indic_category() == OT_ZWJ /* In Sinhala & Telugu, form Reph only if ZWJ is present */: 4763285e107c9a83aeb552e67f9460680ff6d167d88Behdad Esfahbod !is_joiner (info[start + 2] /* In other scripts, any joiner blocks Reph formation */ ) 4773285e107c9a83aeb552e67f9460680ff6d167d88Behdad Esfahbod )) 478617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod { 479617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod limit += 2; 4803285e107c9a83aeb552e67f9460680ff6d167d88Behdad Esfahbod while (limit < end && is_joiner (info[limit])) 4813285e107c9a83aeb552e67f9460680ff6d167d88Behdad Esfahbod limit++; 482617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod base = start; 483617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod has_reph = true; 484617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod }; 48576b3409de6887c1cdd5c679939497b1b56f4554bBehdad Esfahbod 48614dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod enum base_position_t { 48714dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod BASE_FIRST, 48814dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod BASE_LAST 48914dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod } base_pos; 49014dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod 49114dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod switch ((hb_tag_t) buffer->props.script) 49214dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod { 49314dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod case HB_SCRIPT_KHMER: 49414dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod base_pos = BASE_FIRST; 49514dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod break; 49614dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod 49714dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod default: 49814dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod base_pos = BASE_LAST; 49914dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod break; 50014dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod } 50114dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod 50214dbdd9e39d3a869fd1521000c889c347433d22bBehdad Esfahbod if (base_pos == BASE_LAST) 5035d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod { 5045d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod /* -> starting from the end of the syllable, move backwards */ 5055d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod unsigned int i = end; 5065d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod do { 5075d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod i--; 5085d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod /* -> until a consonant is found */ 5095d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod if (is_consonant (info[i])) 5103c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod { 5115d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod /* -> that does not have a below-base or post-base form 5125d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod * (post-base forms have to follow below-base forms), */ 5135d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod if (info[i].indic_position() != POS_BELOW_C && 5145d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod info[i].indic_position() != POS_POST_C) 5155d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod { 5165d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod base = i; 5175d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod break; 5185d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod } 5195d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod 5205d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod /* -> or that is not a pre-base reordering Ra, 5215d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod * 52225e302da9a712e6f1d63b0d243a8df0d326ddba3Behdad Esfahbod * IMPLEMENTATION NOTES: 52325e302da9a712e6f1d63b0d243a8df0d326ddba3Behdad Esfahbod * 52425e302da9a712e6f1d63b0d243a8df0d326ddba3Behdad Esfahbod * Our pre-base reordering Ra's are marked POS_BELOW, so will be skipped 52525e302da9a712e6f1d63b0d243a8df0d326ddba3Behdad Esfahbod * by the logic above already. 5265d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod */ 5275d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod 5285d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod /* -> or arrive at the first consonant. The consonant stopped at will 5295d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod * be the base. */ 5303c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = i; 5313c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod } 5325d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod else 533a9e45c32e4a0d6da33c52f8427aa694e57f52eb9Behdad Esfahbod { 5349e4f94a72cea6d65a6a7ba5a47db92e00dbfbb91Behdad Esfahbod /* A ZWJ stops the base search, and requests an explicit half form. */ 5359e4f94a72cea6d65a6a7ba5a47db92e00dbfbb91Behdad Esfahbod if (info[i].indic_category() == OT_ZWJ) 5365d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod break; 537a9e45c32e4a0d6da33c52f8427aa694e57f52eb9Behdad Esfahbod } 5385d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod } while (i > limit); 5395d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod } 5405d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod else 5415d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod { 5425d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod /* In scripts without half forms (eg. Khmer), the first consonant is always the base. */ 5435d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod 5445d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod if (!has_reph) 5455d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod base = limit; 5465d32690a3428fa86eb26fe5fcec943a10aa95881Behdad Esfahbod } 547743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 5483c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod if (base < start) 5493c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod base = start; /* Just in case... */ 550743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 551617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod 552617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 553617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * and has more than one consonant, Ra is excluded from candidates for 554617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod * base consonants. */ 555617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod if (has_reph && base == start) { 556617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod /* Have no other consonant, so Reph is not formed and Ra becomes base. */ 557617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod has_reph = false; 558617f4ac46f1084859d2034c08760e31e52d3bec3Behdad Esfahbod } 5595e4e21fce4b548b0b8a5951bc8f35a9f27428192Behdad Esfahbod } 5603d25079f8d6be81b9b4b91d3a97016b8a572f571Behdad Esfahbod 5613d25079f8d6be81b9b4b91d3a97016b8a572f571Behdad Esfahbod 562743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 2. Decompose and reorder Matras: 563743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 564743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Each matra and any syllable modifier sign in the cluster are moved to the 565743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * appropriate position relative to the consonant(s) in the cluster. The 566743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * shaping engine decomposes two- or three-part matras into their constituent 567743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * parts before any repositioning. Matra characters are classified by which 568743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * consonant in a conjunct they have affinity for and are reordered to the 569743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * following positions: 570743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 571743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o Before first half form in the syllable 572743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After subjoined consonants 573743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After post-form consonant 574743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * o After main consonant (for above marks) 575743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 576743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 577743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 578743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * The normalize() routine has already decomposed matras for us, so we don't 579743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * need to worry about that. 580743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 581743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 582743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 583743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* 3. Reorder marks to canonical order: 584743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 585743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * Adjacent nukta and halant or nukta and vedic sign are always repositioned 586743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * if necessary, so that the nukta is first. 587743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 588743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * IMPLEMENTATION NOTES: 589743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * 590743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * We don't need to do this: the normalize() routine already did this for us. 591743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod */ 592743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 593743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 59445d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* Reorder characters */ 59545d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 5963c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < base; i++) 597900cf3d449bf36d4f8b1474590cae925fef48fc8Behdad Esfahbod info[i].indic_position() = MIN (POS_PRE_C, (indic_position_t) info[i].indic_position()); 59855f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod 599075d671f1093d2e3c58f7f45568696030f1b3efdBehdad Esfahbod if (base < end) 600075d671f1093d2e3c58f7f45568696030f1b3efdBehdad Esfahbod info[base].indic_position() = POS_BASE_C; 60145d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 60255f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod /* Mark final consonants. A final consonant is one appearing after a matra, 60355f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod * like in Khmer. */ 60455f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 60555f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod if (info[i].indic_category() == OT_M) { 60655f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod for (unsigned int j = i + 1; j < end; j++) 60755f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod if (is_consonant (info[j])) { 60855f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod info[j].indic_position() = POS_FINAL_C; 60955f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod break; 61055f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod } 61155f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod break; 61255f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod } 61355f70ebfb95083f515d9b0044a2a65ab11484bb5Behdad Esfahbod 614fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod /* Handle beginning Ra */ 6155e4e21fce4b548b0b8a5951bc8f35a9f27428192Behdad Esfahbod if (has_reph) 616dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start].indic_position() = POS_RA_TO_BECOME_REPH; 617fd06bf56110e73826b3d5c73ac964e2609450d46Behdad Esfahbod 618f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* For old-style Indic script tags, move the first post-base Halant after 619f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod * last consonant. */ 620a3e04bee2c2fa648759a87e460db6b4f1b685586Behdad Esfahbod if (IS_OLD_INDIC_TAG (map->get_chosen_script (0))) { 6213c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 622f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (info[i].indic_category() == OT_H) { 623f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod unsigned int j; 624f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod for (j = end - 1; j > i; j--) 625190eb31a16178269aecaf5d2ecc9012f956749f4Behdad Esfahbod if (is_consonant (info[j])) 626f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 627f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod if (j > i) { 628f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod /* Move Halant to after last consonant. */ 629f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod hb_glyph_info_t t = info[i]; 630f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0])); 631f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod info[j] = t; 632f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 633f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod break; 634f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 635f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod } 636f5bc2725cb892264ba223e0a49f7fd2c622a0730Behdad Esfahbod 63781202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod /* Attach misc marks to previous char to move with them. */ 638ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 63981202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod indic_position_t last_pos = POS_START; 64081202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod for (unsigned int i = start; i < end; i++) 64181202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod { 64281202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod if ((FLAG (info[i].indic_category()) & (JOINER_FLAGS | FLAG (OT_N) | FLAG (OT_RS) | HALANT_OR_COENG_FLAGS))) 64381202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod { 64481202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod info[i].indic_position() = last_pos; 64581202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod if (unlikely (indic_options ().uniscribe_bug_compatible && 64681202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod info[i].indic_category() == OT_H && 64781202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod info[i].indic_position() == POS_PRE_M)) 64881202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod { 64981202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod /* 65081202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod * Uniscribe doesn't move the Halant with Left Matra. 65181202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod * TEST: U+092B,U+093F,U+094DE 65281202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod */ 653ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod for (unsigned int j = i; j > start; j--) 6546a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[j - 1].indic_position() != POS_PRE_M) { 655ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod info[i].indic_position() = info[j - 1].indic_position(); 656ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod break; 657ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 65881202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod } 65981202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod } else if (info[i].indic_position() != POS_SMVD) { 66081202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod last_pos = (indic_position_t) info[i].indic_position(); 661ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 66281202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod } 663ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod } 66474ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod /* Re-attach ZWJ, ZWNJ, and halant to next char, for after-base consonants. */ 66574ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod { 66674ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod unsigned int last_halant = end; 66774ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 668deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod if (is_halant_or_coeng (info[i])) 66974ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod last_halant = i; 67074ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod else if (is_consonant (info[i])) { 67174ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod for (unsigned int j = last_halant; j < i; j++) 67281202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod if (info[j].indic_position() != POS_SMVD) 67381202bd860e4034c18d9f80c5a4f33d9f48463a3Behdad Esfahbod info[j].indic_position() = info[i].indic_position(); 67474ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod } 67574ccc6a1322f8c48c5f2a05f04821783c4b87a14Behdad Esfahbod } 67645d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 67745d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod /* We do bubble-sort, skip malicious clusters attempts */ 678b99d63ae114fb58f129562b293a8a66543d499adBehdad Esfahbod if (end - start < 64) 679a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod { 680a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod /* Sit tight, rock 'n roll! */ 681d3637edb248162970e202e9d0671540274192844Behdad Esfahbod hb_bubble_sort (info + start, end - start, compare_indic_order); 682a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod /* Find base again */ 683a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod base = end; 6843c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < end; i++) 685a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod if (info[i].indic_position() == POS_BASE_C) { 686a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod base = i; 687a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod break; 688a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod } 689a391ff50b9a7b6ac3e58d199ea726b20ee6839bbBehdad Esfahbod } 69045d6f29f15f1d2323bcaa2498aed23ff0c8a1567Behdad Esfahbod 691743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Setup masks now */ 692743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 693281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod { 694281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod hb_mask_t mask; 695281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod 696dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* Reph */ 697668c6046c1b3af3bd316bda0cc8636f2a5e8df42Behdad Esfahbod for (unsigned int i = start; i < end && info[i].indic_position() == POS_RA_TO_BECOME_REPH; i++) 69870fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod info[i].mask |= basic_mask_array[RPHF]; 699dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 700281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Pre-base */ 70120b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod mask = basic_mask_array[HALF]; 7023c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start; i < base; i++) 703281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 704281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Base */ 70520b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod mask = 0; 706075d671f1093d2e3c58f7f45568696030f1b3efdBehdad Esfahbod if (base < end) 707075d671f1093d2e3c58f7f45568696030f1b3efdBehdad Esfahbod info[base].mask |= mask; 708281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod /* Post-base */ 70920b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod mask = basic_mask_array[BLWF] | basic_mask_array[ABVF] | basic_mask_array[PSTF]; 7103c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 711281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod info[i].mask |= mask; 712281683995a46ed37aeeb84061249758c59822457Behdad Esfahbod } 7139da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 71417d7de91d76406d3e92db37d9eef2fc615f06e68Behdad Esfahbod /* XXX This will not match for old-Indic spec since the Halant-Ra order is reversed already. */ 7158e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if (basic_mask_array[PREF] && base + 3 <= end) 71617d7de91d76406d3e92db37d9eef2fc615f06e68Behdad Esfahbod { 7178e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod /* Find a Halant,Ra sequence and mark it fore pre-base reordering processing. */ 7188e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod for (unsigned int i = base + 1; i + 1 < end; i++) 719deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod if (is_halant_or_coeng (info[i]) && 7208e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod info[i + 1].indic_category() == OT_Ra) 7218e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod { 7220201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod info[i++].mask |= basic_mask_array[PREF]; 7230201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod info[i++].mask |= basic_mask_array[PREF]; 7240201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod 7250201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod /* Mark the subsequent stuff with 'cfar'. Used in Khmer. 7260201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod * Read the feature spec. 7270201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod * This allows distinguishing the following cases with MS Khmer fonts: 7280201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod * U+1784,U+17D2,U+179A,U+17D2,U+1782 7290201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod * U+1784,U+17D2,U+1782,U+17D2,U+179A 7300201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod */ 7310201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod for (; i < end; i++) 7320201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod info[i].mask |= basic_mask_array[CFAR]; 7330201e0a4649ad5b607e50bcb9605e7a5b7143812Behdad Esfahbod 7348e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod break; 7358e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod } 73617d7de91d76406d3e92db37d9eef2fc615f06e68Behdad Esfahbod } 73717d7de91d76406d3e92db37d9eef2fc615f06e68Behdad Esfahbod 7389da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod /* Apply ZWJ/ZWNJ effects */ 7393c2ea9481b1028e927e615a5434ebf8edcb5f891Behdad Esfahbod for (unsigned int i = start + 1; i < end; i++) 7409da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod if (is_joiner (info[i])) { 7419da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod bool non_joiner = info[i].indic_category() == OT_ZWNJ; 7426b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod unsigned int j = i; 7439da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod 7449da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod do { 7459da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod j--; 7466b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 74720b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod /* A ZWJ disables CJCT, however, it's mere presence is enough 74820b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod * to disable ligation. No explicit action needed. */ 74920b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod 75020b68e699f73e6ce046c0ec143d40b3d6d48e06bBehdad Esfahbod /* A ZWNJ disables HALF. */ 7516b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod if (non_joiner) 75270fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod info[j].mask &= ~basic_mask_array[HALF]; 7536b37bc80843e38ca7b62500f95fd70c08af68d62Behdad Esfahbod 7549da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } while (j > start && !is_consonant (info[j])); 7559da0487cd452d780673e24329ce03e174a4ef83bBehdad Esfahbod } 756743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 757743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 758743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 759743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 7609f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_vowel_syllable (const hb_ot_map_t *map, 7619f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 76270fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod hb_mask_t *basic_mask_array, 763ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 764743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 765c5306b6861cfaa50af40e8ceb058791fa06d7981Behdad Esfahbod /* We made the vowels look like consonants. So let's call the consonant logic! */ 76670fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod initial_reordering_consonant_syllable (map, buffer, basic_mask_array, start, end); 767743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 768743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 769743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 7709f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_standalone_cluster (const hb_ot_map_t *map, 7719f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer, 77270fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod hb_mask_t *basic_mask_array, 773ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 774743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 77518c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod /* We treat NBSP/dotted-circle as if they are consonants, so we should just chain. 77618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * Only if not in compatibility mode that is... */ 77718c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod 778a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (indic_options ().uniscribe_bug_compatible) 77918c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod { 78018c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod /* For dotted-circle, this is what Uniscribe does: 78118c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * If dotted-circle is the last glyph, it just does nothing. 78218c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod * Ie. It doesn't form Reph. */ 78318c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod if (buffer->info[end - 1].indic_category() == OT_DOTTEDCIRCLE) 78418c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod return; 78518c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod } 78618c06e189bd078affbb84c3bb5bb80687a227c5eBehdad Esfahbod 78770fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod initial_reordering_consonant_syllable (map, buffer, basic_mask_array, start, end); 788743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 789743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 790743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 7919f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbodinitial_reordering_non_indic (const hb_ot_map_t *map HB_UNUSED, 7929f377ed3210fe7d9f15e0c4f82020556f9a8f6f0Behdad Esfahbod hb_buffer_t *buffer HB_UNUSED, 79370fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod hb_mask_t *basic_mask_array HB_UNUSED, 7943f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod unsigned int start HB_UNUSED, unsigned int end HB_UNUSED) 795743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 796743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod /* Nothing to do right now. If we ever switch to using the output 797743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod * buffer in the reordering process, we'd need to next_glyph() here. */ 798743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 799743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 800743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod#include "hb-ot-shape-complex-indic-machine.hh" 801743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 802743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 803743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodinitial_reordering (const hb_ot_map_t *map, 8043f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod hb_face_t *face HB_UNUSED, 805743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod hb_buffer_t *buffer, 806743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod void *user_data HB_UNUSED) 807743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 80870fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod hb_mask_t basic_mask_array[ARRAY_LENGTH (indic_basic_features)] = {0}; 809b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod unsigned int num_masks = ARRAY_LENGTH (indic_basic_features); 810b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod for (unsigned int i = 0; i < num_masks; i++) 81170fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod basic_mask_array[i] = map->get_1_mask (indic_basic_features[i].tag); 812743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 81370fe77bb9a25922bd34f206826d8731d901fb451Behdad Esfahbod find_syllables (map, buffer, basic_mask_array); 814b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod} 815b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 816743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbodstatic void 81746e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbodfinal_reordering_syllable (hb_buffer_t *buffer, 81846e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod hb_mask_t init_mask, hb_mask_t pref_mask, 819ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int start, unsigned int end) 820743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod{ 8214ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod hb_glyph_info_t *info = buffer->info; 8224ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 823e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod /* 4. Final reordering: 824e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 825e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * After the localized forms and basic shaping forms GSUB features have been 826e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * applied (see below), the shaping engine performs some final glyph 827e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * reordering before applying all the remaining font features to the entire 828e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * cluster. 8294ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod */ 8304ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 8314ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* Find base again */ 8324ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod unsigned int base = end; 83310cdc94eee2225f14c198c015256a5a0063eecadBehdad Esfahbod while (start < base && info[base - 1].indic_position() >= POS_BASE_C) 83410cdc94eee2225f14c198c015256a5a0063eecadBehdad Esfahbod base--; 8354ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 8364705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod unsigned int start_of_last_cluster = base; 8374705a7026900e51f6430f03a73c87f2df035df92Behdad Esfahbod 8384ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* o Reorder matras: 839e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 840e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base matra character had been reordered before applying basic 841e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * features, the glyph can be moved closer to the main consonant based on 842e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * whether half-forms had been formed. Actual position for the matra is 843e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * defined as “after last standalone halant glyph, after initial matra 844e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * position and before the main consonant”. If ZWJ or ZWNJ follow this 845e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * halant, position is moved after it. 8464ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod */ 8474ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 848362d3db8d3527d0fef260a17d2466e92a4a25425Behdad Esfahbod if (start < base) /* Otherwise there can't be any pre-base matra characters. */ 8499d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod { 850921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod unsigned int new_pos = base - 1; 851921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod while (new_pos > start && 852deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod !(FLAG (info[new_pos].indic_category()) & (FLAG (OT_M) | FLAG (OT_H) | FLAG (OT_Coeng)))) 853921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod new_pos--; 8549d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* If we found no Halant we are done. Otherwise only proceed if the Halant does 8559d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod * not belong to the Matra itself! */ 856deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod if (is_halant_or_coeng (info[new_pos]) && 857921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod info[new_pos].indic_position() != POS_PRE_M) { 8589d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 859921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod if (new_pos + 1 < end && is_joiner (info[new_pos + 1])) 860921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod new_pos++; 8619d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod 8629d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* Now go see if there's actually any matras... */ 863921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod for (unsigned int i = new_pos; i > start; i--) 8646a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[i - 1].indic_position () == POS_PRE_M) 8659d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod { 8661a1dbe9a2787f226f3e43063da8eb6633438b0a0Behdad Esfahbod unsigned int old_pos = i - 1; 8671a1dbe9a2787f226f3e43063da8eb6633438b0a0Behdad Esfahbod hb_glyph_info_t tmp = info[old_pos]; 8681a1dbe9a2787f226f3e43063da8eb6633438b0a0Behdad Esfahbod memmove (&info[old_pos], &info[old_pos + 1], (new_pos - old_pos) * sizeof (info[0])); 8691a1dbe9a2787f226f3e43063da8eb6633438b0a0Behdad Esfahbod info[new_pos] = tmp; 870921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod start_of_last_cluster = MIN (new_pos, start_of_last_cluster); 871921ce5b17daf06af8e17989a3e335b9f5df20483Behdad Esfahbod new_pos--; 8729d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod } 8739d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod } 8744ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod } 8754ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 8764ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod 8774ac9e98d9d2ea973dd612dc4063cf78496c643a0Behdad Esfahbod /* o Reorder reph: 878e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 879e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Reph’s original position is always at the beginning of the syllable, 880e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * (i.e. it is not reordered at the character reordering stage). However, 881e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * it will be reordered according to the basic-forms shaping results. 882e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * Possible positions for reph, depending on the script, are; after main, 883e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * before post-base consonant forms, and after post-base consonant forms. 884dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod */ 885dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 886dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* If there's anything after the Ra that has the REPH pos, it ought to be halant. 887dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * Which means that the font has failed to ligate the Reph. In which case, we 888dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * shouldn't move. */ 889dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod if (start + 1 < end && 890dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start].indic_position() == POS_RA_TO_BECOME_REPH && 891dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod info[start + 1].indic_position() != POS_RA_TO_BECOME_REPH) 892dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod { 89302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod unsigned int new_reph_pos; 89402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 89502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod enum reph_position_t { 896f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_AFTER_MAIN, 897f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_BEFORE_SUBSCRIPT, 898f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_AFTER_SUBSCRIPT, 899f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod REPH_BEFORE_POSTSCRIPT, 9009fc7a11469113d31d8095757c4fc038c3427d44aBehdad Esfahbod REPH_AFTER_POSTSCRIPT 901f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod } reph_pos; 902f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 903f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod /* XXX Figure out old behavior too */ 9047f852b644b8143492a02edfc853114aaa23446bdBehdad Esfahbod switch ((hb_tag_t) buffer->props.script) 905f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod { 906f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_MALAYALAM: 907f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_ORIYA: 908f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_MAIN; 909f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 910f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 911f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_GURMUKHI: 912f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_BEFORE_SUBSCRIPT; 913f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 914f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 915f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_BENGALI: 916f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_SUBSCRIPT; 917f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 918f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 919f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod default: 920f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_DEVANAGARI: 921f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_GUJARATI: 9229c4d24a3a677a58ec59c7fb0f8b70b8aad30a032Behdad Esfahbod case HB_SCRIPT_SINHALA: 923f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_BEFORE_POSTSCRIPT; 924f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 925f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod 926f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_KANNADA: 927f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_TAMIL: 928f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod case HB_SCRIPT_TELUGU: 929f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod reph_pos = REPH_AFTER_POSTSCRIPT; 930f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod break; 931f89367251109af235f4f0446c13c261a5a4a6f72Behdad Esfahbod } 93202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 933dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* 1. If reph should be positioned after post-base consonant forms, 934dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * proceed to step 5. 93502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 9369d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_POSTSCRIPT) 93702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 9389d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod goto reph_step_5; 93902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 94002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 94102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 2. If the reph repositioning class is not after post-base: target 942dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * position is after the first explicit halant glyph between the 943dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first post-reph consonant and last main consonant. If ZWJ or ZWNJ 944dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * are following this halant, position is moved after it. If such 945dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * position is found, this is the target position. Otherwise, 946dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * proceed to the next step. 947dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * 948dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * Note: in old-implementation fonts, where classifications were 949dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * fixed in shaping engine, there was no case where reph position 950dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * will be found on this step. 95102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 95202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 95302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos = start + 1; 954deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos])) 95502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos++; 95602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 957deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) { 95802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 95902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 96002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos++; 96102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_move; 96202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 96302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 96402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 96502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 3. If reph should be repositioned after the main consonant: find the 966dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first consonant not ligated with main, or find the first 967dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * consonant that is not a potential pre-base reordering Ra. 96802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 9699d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_MAIN) 97002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 971b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod new_reph_pos = base; 972b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod /* XXX Skip potential pre-base reordering Ra. */ 973b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod while (new_reph_pos < end && 974be8b9f5f715f6fb36b98bd33c3303f79cc068f8aBehdad Esfahbod !( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_BELOW_C) | FLAG (POS_POST_C) | FLAG (POS_AFTER_POST) | FLAG (POS_SMVD)))) 975b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod new_reph_pos++; 976b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod if (new_reph_pos < end) 977b504e060f008e95b1ba36c06600c9fea4f5d4808Behdad Esfahbod goto reph_move; 97802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 97902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 98002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 4. If reph should be positioned before post-base consonant, find 981dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first post-base classified consonant not ligated with main. If no 982dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * consonant is found, the target position should be before the 983dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * first matra, syllable modifier sign or vedic sign. 98402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 9859d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod /* This is our take on what step 4 is trying to say (and failing, BADLY). */ 9869d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (reph_pos == REPH_AFTER_SUBSCRIPT) 98702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 9889d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_reph_pos = base; 9899d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod while (new_reph_pos < end && 990be8b9f5f715f6fb36b98bd33c3303f79cc068f8aBehdad Esfahbod !( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_POST_C) | FLAG (POS_AFTER_POST) | FLAG (POS_SMVD)))) 9919d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod new_reph_pos++; 9929d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod if (new_reph_pos < end) 9939d0d319a4a7e85d922e58fade0f40caae1c9f109Behdad Esfahbod goto reph_move; 99402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 99502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 99602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 5. If no consonant is found in steps 3 or 4, move reph to a position 997dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * immediately before the first post-base matra, syllable modifier 998dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * sign or vedic sign that has a reordering class after the intended 999dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * reph position. For example, if the reordering position for reph 1000dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * is post-main, it will skip above-base matras that also have a 1001dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod * post-main position. 1002dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod */ 100302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_step_5: 100402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 1005d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod /* Copied from step 2. */ 1006d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod new_reph_pos = start + 1; 1007d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos])) 1008d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod new_reph_pos++; 1009d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod 1010d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) { 1011d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 1012d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 1013d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod new_reph_pos++; 1014d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod goto reph_move; 1015d0e68dbd0b9fc9a42c4280d01c8ffd9c5015d550Behdad Esfahbod } 101602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 1017dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 101802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* 6. Otherwise, reorder reph to the end of the syllable. 101902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod */ 102002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 102102b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos = end - 1; 102202b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod while (new_reph_pos > start && info[new_reph_pos].indic_position() == POS_SMVD) 102302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos--; 102402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod 1025892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod /* 1026892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * If the Reph is to be ending up after a Matra,Halant sequence, 1027892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * position it before that Halant so it can interact with the Matra. 1028892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * However, if it's a plain Consonant,Halant we shouldn't do that. 1029892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * Uniscribe doesn't do this. 1030892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod * TEST: U+0930,U+094D,U+0915,U+094B,U+094D 1031892eb7878238d810a2a70f9dadbf958207bfeaa1Behdad Esfahbod */ 1032a2b471df821b32625d127f83b2f90e6d6a967e7eBehdad Esfahbod if (!indic_options ().uniscribe_bug_compatible && 1033deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod unlikely (is_halant_or_coeng (info[new_reph_pos]))) { 103402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod for (unsigned int i = base + 1; i < new_reph_pos; i++) 103502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod if (info[i].indic_category() == OT_M) { 103602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* Ok, got it. */ 103702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod new_reph_pos--; 103802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 103902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 104002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod goto reph_move; 10418df5636968389ac7bf8620ccd091fd4872b0bbeeBehdad Esfahbod } 10428df5636968389ac7bf8620ccd091fd4872b0bbeeBehdad Esfahbod 104302b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod reph_move: 104402b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod { 104502b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod /* Move */ 104602b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod hb_glyph_info_t reph = info[start]; 104702b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod memmove (&info[start], &info[start + 1], (new_reph_pos - start) * sizeof (info[0])); 104802b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod info[new_reph_pos] = reph; 104902b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod start_of_last_cluster = start; /* Yay, one big cluster! */ 105002b2922fbf098c8282eb23dc2c54d5829cf67024Behdad Esfahbod } 1051dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod } 1052dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 1053dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod 1054dbb105883c6e9b83e78dc8b10766cd56b98cd7e1Behdad Esfahbod /* o Reorder pre-base reordering consonants: 1055e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * 1056e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * If a pre-base reordering consonant is found, reorder it according to 1057e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod * the following rules: 1058e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod */ 1059e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 106046e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod if (pref_mask && base + 1 < end) /* Otherwise there can't be any pre-base reordering Ra. */ 106146e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod { 10628e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod for (unsigned int i = base + 1; i < end; i++) 10638e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if ((info[i].mask & pref_mask) != 0) 106478818124b17691ec2c647142fdb9ae743aa03deeBehdad Esfahbod { 10658e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod /* 1. Only reorder a glyph produced by substitution during application 10668e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * of the <pref> feature. (Note that a font may shape a Ra consonant with 10678e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * the feature generally but block it in certain contexts.) 10688e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod */ 10698e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if (i + 1 == end || (info[i + 1].mask & pref_mask) == 0) 10708e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod { 10718e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod /* 10728e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * 2. Try to find a target position the same way as for pre-base matra. 10738e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * If it is found, reorder pre-base consonant glyph. 10748e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * 10758e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * 3. If position is not found, reorder immediately before main 10768e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod * consonant. 10778e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod */ 10788e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod 10798e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod unsigned int new_pos = base; 10808e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod while (new_pos > start + 1 && 1081deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod !(FLAG (info[new_pos - 1].indic_category()) & (FLAG (OT_M) | FLAG (OT_H) | FLAG (OT_Coeng)))) 10828e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod new_pos--; 10838e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod 1084deb521dee4fdca8c2124cfb39a205e6269d4a70dBehdad Esfahbod if (new_pos > start && is_halant_or_coeng (info[new_pos - 1])) 10858e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 10868e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod if (new_pos < end && is_joiner (info[new_pos])) 10878e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod new_pos++; 10888e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod 10898e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod { 10908e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod unsigned int old_pos = i; 10918e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod hb_glyph_info_t tmp = info[old_pos]; 10928e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod memmove (&info[new_pos + 1], &info[new_pos], (old_pos - new_pos) * sizeof (info[0])); 10938e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod info[new_pos] = tmp; 10948e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod start_of_last_cluster = MIN (new_pos, start_of_last_cluster); 10958e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod } 10968e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod } 10978e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod 10988e7b5882fb4c1921c9d030d354a9b998115cdb8cBehdad Esfahbod break; 109978818124b17691ec2c647142fdb9ae743aa03deeBehdad Esfahbod } 110046e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod } 1101eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 1102eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 1103a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod /* Apply 'init' to the Left Matra if it's a word start. */ 11046a091df9b403b147ef78f3974610dedf4ce1e08aBehdad Esfahbod if (info[start].indic_position () == POS_PRE_M && 1105a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod (!start || 1106eace47b173807d94b29a6490d0bc3c9f8f6168d1Behdad Esfahbod !(FLAG (_hb_glyph_info_get_general_category (&info[start - 1])) & 11072c372b80f6befad69e216e3f218b38640b8cc044Behdad Esfahbod FLAG_RANGE (HB_UNICODE_GENERAL_CATEGORY_FORMAT, HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))) 110846e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod info[start].mask |= init_mask; 1109a913b024d84973556094fd64ce5f0b7106fcc3b5Behdad Esfahbod 1110eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 11118ed248de77e5d2ed978e55c0ce1a11727bc9e34cBehdad Esfahbod /* 11128ed248de77e5d2ed978e55c0ce1a11727bc9e34cBehdad Esfahbod * Finish off the clusters and go home! 11138ed248de77e5d2ed978e55c0ce1a11727bc9e34cBehdad Esfahbod */ 111421d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 1115decf6ffca475fe01ff3151b7641f629f031137d2Behdad Esfahbod if (indic_options ().uniscribe_bug_compatible) 1116ebe29733d44fe0fa9fb30f946ab0dd7a40336a24Behdad Esfahbod { 111730c3d5e9fc61b49c2c6ad4e744300edd6f3e0261Behdad Esfahbod /* Uniscribe merges the entire cluster. 111821d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * This means, half forms are submerged into the main consonants cluster. 111921d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * This is unnecessary, and makes cursor positioning harder, but that's what 112021d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod * Uniscribe does. */ 112130c3d5e9fc61b49c2c6ad4e744300edd6f3e0261Behdad Esfahbod start_of_last_cluster = start; 112221d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod } 112321d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod 112421d2803133c2c424ed37a9f3d17c7fc4963e5a60Behdad Esfahbod buffer->merge_clusters (start_of_last_cluster, end); 1125ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod} 1126e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 1127e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 1128ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodstatic void 1129ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbodfinal_reordering (const hb_ot_map_t *map, 11303f18236a03880c0960f5990dc90685f6146951a6Behdad Esfahbod hb_face_t *face HB_UNUSED, 1131ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_buffer_t *buffer, 1132ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod void *user_data HB_UNUSED) 1133ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod{ 1134ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int count = buffer->len; 1135ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod if (!count) return; 1136ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod 113746e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod hb_mask_t init_mask = map->get_1_mask (HB_TAG('i','n','i','t')); 113846e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod hb_mask_t pref_mask = map->get_1_mask (HB_TAG('p','r','e','f')); 1139eed903b1644e087178438959664a6a57bebc398bBehdad Esfahbod 1140ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod hb_glyph_info_t *info = buffer->info; 1141ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod unsigned int last = 0; 1142cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod unsigned int last_syllable = info[0].syllable(); 1143ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod for (unsigned int i = 1; i < count; i++) 1144cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod if (last_syllable != info[i].syllable()) { 114546e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod final_reordering_syllable (buffer, init_mask, pref_mask, last, i); 1146ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod last = i; 1147cee7187447b76b22e1bb6136d137b35ac49c3a5dBehdad Esfahbod last_syllable = info[last].syllable(); 1148ef24cc8c8e2478a6352c340f4611a617646de4ccBehdad Esfahbod } 114946e645ec4b59f0a278347be11f40c7df700d5bb6Behdad Esfahbod final_reordering_syllable (buffer, init_mask, pref_mask, last, count); 1150e7be05702447ae270d797398132c1930cd3a9b86Behdad Esfahbod 1151743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); 1152743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); 1153743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod} 1154743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 1155743807a3ce1b2229e5307a8aea074a7544623d8dBehdad Esfahbod 1156b9ddbd55930228422e82b34a141ad1b6093f5376Behdad Esfahbod 1157