15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Copyright © 2011,2012 Google, Inc. 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This is part of HarfBuzz, a text shaping library. 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Permission is hereby granted, without written agreement and without 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * license or royalty fees, to use, copy, modify, and distribute this 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * software and its documentation for any purpose, provided that the 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * above copyright notice and the following two paragraphs appear in 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * all copies of this software. 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DAMAGE. 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Google Author(s): Behdad Esfahbod 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "hb-ot-shape-complex-indic-private.hh" 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "hb-ot-layout-private.hh" 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 30c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)/* buffer var allocations */ 31c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define indic_category() complex_var_u8_0() /* indic_category_t */ 32c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define indic_position() complex_var_u8_1() /* indic_position_t */ 33c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 36c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Indic shaper. 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 39c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IN_HALF_BLOCK(u, Base) (((u) & ~0x7Fu) == (Base)) 41c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_DEVA(u) (IN_HALF_BLOCK (u, 0x0900u)) 435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_BENG(u) (IN_HALF_BLOCK (u, 0x0980u)) 445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_GURU(u) (IN_HALF_BLOCK (u, 0x0A00u)) 455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_GUJR(u) (IN_HALF_BLOCK (u, 0x0A80u)) 465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_ORYA(u) (IN_HALF_BLOCK (u, 0x0B00u)) 475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_TAML(u) (IN_HALF_BLOCK (u, 0x0B80u)) 485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_TELU(u) (IN_HALF_BLOCK (u, 0x0C00u)) 495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_KNDA(u) (IN_HALF_BLOCK (u, 0x0C80u)) 505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_MLYM(u) (IN_HALF_BLOCK (u, 0x0D00u)) 515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_SINH(u) (IN_HALF_BLOCK (u, 0x0D80u)) 525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define IS_KHMR(u) (IN_HALF_BLOCK (u, 0x1780u)) 53c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 54c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 55c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define MATRA_POS_LEFT(u) POS_PRE_M 56c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define MATRA_POS_RIGHT(u) ( \ 57c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_DEVA(u) ? POS_AFTER_SUB : \ 58c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_BENG(u) ? POS_AFTER_POST : \ 59c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_GURU(u) ? POS_AFTER_POST : \ 60c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_GUJR(u) ? POS_AFTER_POST : \ 61c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_ORYA(u) ? POS_AFTER_POST : \ 62c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_TAML(u) ? POS_AFTER_POST : \ 635f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) IS_TELU(u) ? (u <= 0x0C42u ? POS_BEFORE_SUB : POS_AFTER_SUB) : \ 645f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) IS_KNDA(u) ? (u < 0x0CC3u || u > 0xCD6u ? POS_BEFORE_SUB : POS_AFTER_SUB) : \ 65c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_MLYM(u) ? POS_AFTER_POST : \ 66c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_SINH(u) ? POS_AFTER_SUB : \ 67c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_KHMR(u) ? POS_AFTER_POST : \ 68c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /*default*/ POS_AFTER_SUB \ 69c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) ) 70c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define MATRA_POS_TOP(u) ( /* BENG and MLYM don't have top matras. */ \ 71c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_DEVA(u) ? POS_AFTER_SUB : \ 72c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_GURU(u) ? POS_AFTER_POST : /* Deviate from spec */ \ 73c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_GUJR(u) ? POS_AFTER_SUB : \ 74c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_ORYA(u) ? POS_AFTER_MAIN : \ 75c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_TAML(u) ? POS_AFTER_SUB : \ 76c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_TELU(u) ? POS_BEFORE_SUB : \ 77c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_KNDA(u) ? POS_BEFORE_SUB : \ 78c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_SINH(u) ? POS_AFTER_SUB : \ 79c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_KHMR(u) ? POS_AFTER_POST : \ 80c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /*default*/ POS_AFTER_SUB \ 81c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) ) 82c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#define MATRA_POS_BOTTOM(u) ( \ 83c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_DEVA(u) ? POS_AFTER_SUB : \ 84c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_BENG(u) ? POS_AFTER_SUB : \ 85c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_GURU(u) ? POS_AFTER_POST : \ 86c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_GUJR(u) ? POS_AFTER_POST : \ 87c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_ORYA(u) ? POS_AFTER_SUB : \ 88c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_TAML(u) ? POS_AFTER_POST : \ 89c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_TELU(u) ? POS_BEFORE_SUB : \ 90c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_KNDA(u) ? POS_BEFORE_SUB : \ 91c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_MLYM(u) ? POS_AFTER_POST : \ 92c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_SINH(u) ? POS_AFTER_SUB : \ 93c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) IS_KHMR(u) ? POS_AFTER_POST : \ 94c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /*default*/ POS_AFTER_SUB \ 95c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) ) 96c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 97c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)static inline indic_position_t 98c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)matra_position (hb_codepoint_t u, indic_position_t side) 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 100c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) switch ((int) side) 101c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 102c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) case POS_PRE_C: return MATRA_POS_LEFT (u); 103c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) case POS_POST_C: return MATRA_POS_RIGHT (u); 104c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) case POS_ABOVE_C: return MATRA_POS_TOP (u); 105c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) case POS_BELOW_C: return MATRA_POS_BOTTOM (u); 106c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) }; 107c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return side; 108c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 110c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)/* XXX 111c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * This is a hack for now. We should move this data into the main Indic table. 112c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Or completely remove it and just check in the tables. 113c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) */ 114c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)static const hb_codepoint_t ra_chars[] = { 1155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0930u, /* Devanagari */ 1165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x09B0u, /* Bengali */ 1175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x09F0u, /* Bengali */ 1185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0A30u, /* Gurmukhi */ /* No Reph */ 1195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0AB0u, /* Gujarati */ 1205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0B30u, /* Oriya */ 1215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0BB0u, /* Tamil */ /* No Reph */ 1225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0C30u, /* Telugu */ /* Reph formed only with ZWJ */ 1235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0CB0u, /* Kannada */ 1245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0D30u, /* Malayalam */ /* No Reph, Logical Repha */ 1255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x0DBBu, /* Sinhala */ /* Reph formed only with ZWJ */ 1275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x179Au, /* Khmer */ /* No Reph, Visual Repha */ 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 131c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)static inline bool 132c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)is_ra (hb_codepoint_t u) 133c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles){ 134c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) for (unsigned int i = 0; i < ARRAY_LENGTH (ra_chars); i++) 135c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (u == ra_chars[i]) 136c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return true; 137c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return false; 138c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 139c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 140c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)static inline bool 141c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)is_one_of (const hb_glyph_info_t &info, unsigned int flags) 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 143c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* If it ligated, all bets are off. */ 144f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (_hb_glyph_info_ligated (&info)) return false; 145c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return !!(FLAG (info.indic_category()) & flags); 146c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 147c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 148c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)static inline bool 149c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)is_joiner (const hb_glyph_info_t &info) 150c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles){ 151c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return is_one_of (info, JOINER_FLAGS); 152c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 154c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)static inline bool 155c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)is_consonant (const hb_glyph_info_t &info) 156c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles){ 157c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return is_one_of (info, CONSONANT_FLAGS); 158c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 160c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)static inline bool 161c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)is_halant_or_coeng (const hb_glyph_info_t &info) 162c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles){ 163c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return is_one_of (info, HALANT_OR_COENG_FLAGS); 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 166c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)static inline void 167c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)set_indic_properties (hb_glyph_info_t &info) 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 169c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) hb_codepoint_t u = info.codepoint; 170c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) unsigned int type = hb_indic_get_categories (u); 1715f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) indic_category_t cat = (indic_category_t) (type & 0x7Fu); 172c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) indic_position_t pos = (indic_position_t) (type >> 8); 173c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 174c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 175c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* 176c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Re-assign category 177c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) */ 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 179c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 180c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* The spec says U+0952 is OT_A. However, testing shows that Uniscribe 1815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * treats a whole bunch of characters similarly. 1825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * TESTS: For example, for U+0951: 183c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * U+092E,U+0947,U+0952 184c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * U+092E,U+0952,U+0947 185c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * U+092E,U+0947,U+0951 186c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * U+092E,U+0951,U+0947 1875f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * U+092E,U+0951,U+0952 1885f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * U+092E,U+0952,U+0951 189f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) */ 1905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (unlikely (hb_in_ranges (u, 0x0951u, 0x0952u, 1915f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x1CD0u, 0x1CD2u, 1925f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x1CD4u, 0x1CE1u) || 1935f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) u == 0x1CF4u)) 194f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) cat = OT_A; 1955f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* The following act more like the Bindus. */ 1965f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (hb_in_range (u, 0x0953u, 0x0954u))) 1975f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cat = OT_SM; 1985f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* The following act like consonants. */ 1995f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (hb_in_ranges (u, 0x0A72u, 0x0A73u, 2005f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x1CF5u, 0x1CF6u))) 2015f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cat = OT_C; 2025f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* TODO: The following should only be allowed after a Visarga. 2035f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * For now, just treat them like regular tone marks. */ 2045f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (hb_in_range (u, 0x1CE2u, 0x1CE8u))) 2055f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cat = OT_A; 2065f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* TODO: The following should only be allowed after some of 2075f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * the nasalization marks, maybe only for U+1CE9..U+1CF1. 2085f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * For now, just treat them like tone marks. */ 2095f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (u == 0x1CEDu)) 2105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cat = OT_A; 2115f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* The following take marks in standalone clusters, similar to Avagraha. */ 2125f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (hb_in_ranges (u, 0xA8F2u, 0xA8F7u, 2135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x1CE9u, 0x1CECu, 2145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0x1CEEu, 0x1CF1u))) 2155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 2165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cat = OT_Symbol; 2175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ASSERT_STATIC ((int) INDIC_SYLLABIC_CATEGORY_AVAGRAHA == OT_Symbol); 2185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (hb_in_range (u, 0x17CDu, 0x17D1u) || 2205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) u == 0x17CBu || u == 0x17D3u || u == 0x17DDu)) /* Khmer Various signs */ 221c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 222c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* These are like Top Matras. */ 223c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) cat = OT_M; 224c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) pos = POS_ABOVE_C; 225c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 2265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (u == 0x17C6u)) cat = OT_N; /* Khmer Bindu doesn't like to be repositioned. */ 2275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (u == 0x17D2u)) cat = OT_Coeng; /* Khmer coeng */ 2285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (hb_in_range (u, 0x2010u, 0x2011u))) 2295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cat = OT_PLACEHOLDER; 2305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (u == 0x25CCu)) cat = OT_DOTTEDCIRCLE; 2315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (u == 0xA982u)) cat = OT_SM; /* Javanese repha. */ 2325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (u == 0xA9BEu)) cat = OT_CM2; /* Javanese medial ya. */ 2335f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if (unlikely (u == 0xA9BDu)) { cat = OT_M; pos = POS_POST_C; } /* Javanese vocalic r. */ 234c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 235c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 236c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* 237c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Re-assign position. 238c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) */ 239c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 240c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if ((FLAG (cat) & CONSONANT_FLAGS)) 241c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 242f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) pos = POS_BASE_C; 243c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (is_ra (u)) 244c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) cat = OT_Ra; 245c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 246c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) else if (cat == OT_M) 247c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 248c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) pos = matra_position (u, pos); 249c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 2505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) else if ((FLAG (cat) & (FLAG (OT_SM) | FLAG (OT_VD) | FLAG (OT_A) | FLAG (OT_Symbol)))) 251c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 252c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) pos = POS_SMVD; 253c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 254c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 2555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (unlikely (u == 0x0B01u)) pos = POS_BEFORE_SUB; /* Oriya Bindu is BeforeSub in the spec. */ 256c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 257c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 258c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 259c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) info.indic_category() = cat; 260c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) info.indic_position() = pos; 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 263c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)/* 264c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Things above this line should ideally be moved to the Indic table itself. 265c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) */ 266c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Indic configurations. Note that we do not want to keep every single script-specific 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * behavior in these tables necessarily. This should mainly be used for per-script 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * properties that are cheaper keeping here, than in the code. Ie. if, say, one and 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * only one script has an exception, that one script can be if'ed directly in the code, 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * instead of adding a new flag in these structs. 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum base_position_t { 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) BASE_POS_FIRST, 278f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) BASE_POS_LAST_SINHALA, 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) BASE_POS_LAST 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum reph_position_t { 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) REPH_POS_AFTER_MAIN = POS_AFTER_MAIN, 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) REPH_POS_BEFORE_SUB = POS_BEFORE_SUB, 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) REPH_POS_AFTER_SUB = POS_AFTER_SUB, 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) REPH_POS_BEFORE_POST = POS_BEFORE_POST, 286f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) REPH_POS_AFTER_POST = POS_AFTER_POST, 287f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) REPH_POS_DONT_CARE = POS_RA_TO_BECOME_REPH 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum reph_mode_t { 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) REPH_MODE_IMPLICIT, /* Reph formed out of initial Ra,H sequence. */ 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) REPH_MODE_EXPLICIT, /* Reph formed out of initial Ra,H,ZWJ sequence. */ 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) REPH_MODE_VIS_REPHA, /* Encoded Repha character, no reordering needed. */ 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) REPH_MODE_LOG_REPHA /* Encoded Repha character, needs reordering. */ 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 295f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)enum blwf_mode_t { 296f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) BLWF_MODE_PRE_AND_POST, /* Below-forms feature applied to pre-base and post-base. */ 297f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) BLWF_MODE_POST_ONLY /* Below-forms feature applied to post-base only. */ 298f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)}; 299f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)enum pref_len_t { 300f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) PREF_LEN_1 = 1, 301f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) PREF_LEN_2 = 2, 302f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) PREF_LEN_DONT_CARE = PREF_LEN_2 303f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)}; 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct indic_config_t 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 3065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_script_t script; 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool has_old_spec; 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_codepoint_t virama; 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base_position_t base_pos; 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reph_position_t reph_pos; 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reph_mode_t reph_mode; 312f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) blwf_mode_t blwf_mode; 313f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) pref_len_t pref_len; 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static const indic_config_t indic_configs[] = 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 3185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Default. Should be first. */ 3195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_INVALID, false, 0,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_1}, 3205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_DEVANAGARI,true, 0x094Du,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE}, 3215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_BENGALI, true, 0x09CDu,BASE_POS_LAST, REPH_POS_AFTER_SUB, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE}, 3225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_GURMUKHI, true, 0x0A4Du,BASE_POS_LAST, REPH_POS_BEFORE_SUB, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE}, 3235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_GUJARATI, true, 0x0ACDu,BASE_POS_LAST, REPH_POS_BEFORE_POST,REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE}, 3245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_ORIYA, true, 0x0B4Du,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE}, 3255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_TAMIL, true, 0x0BCDu,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_2}, 3265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_TELUGU, true, 0x0C4Du,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_EXPLICIT, BLWF_MODE_POST_ONLY, PREF_LEN_2}, 3275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_KANNADA, true, 0x0CCDu,BASE_POS_LAST, REPH_POS_AFTER_POST, REPH_MODE_IMPLICIT, BLWF_MODE_POST_ONLY, PREF_LEN_2}, 3285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_MALAYALAM, true, 0x0D4Du,BASE_POS_LAST, REPH_POS_AFTER_MAIN, REPH_MODE_LOG_REPHA,BLWF_MODE_PRE_AND_POST, PREF_LEN_2}, 3295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_SINHALA, false,0x0DCAu,BASE_POS_LAST_SINHALA, 3305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) REPH_POS_AFTER_MAIN, REPH_MODE_EXPLICIT, BLWF_MODE_PRE_AND_POST, PREF_LEN_DONT_CARE}, 3315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_KHMER, false,0x17D2u,BASE_POS_FIRST,REPH_POS_DONT_CARE, REPH_MODE_VIS_REPHA,BLWF_MODE_PRE_AND_POST, PREF_LEN_2}, 3325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) {HB_SCRIPT_JAVANESE, false,0xA9C0u,BASE_POS_FIRST,REPH_POS_DONT_CARE, REPH_MODE_VIS_REPHA,BLWF_MODE_PRE_AND_POST, PREF_LEN_1}, 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Indic shaper. 3395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 3405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct feature_list_t { 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_tag_t tag; 343c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) hb_ot_map_feature_flags_t flags; 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static const feature_list_t 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)indic_features[] = 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Basic features. 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * These features are applied in order, one at a time, after initial_reordering. 3525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 353c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('n','u','k','t'), F_GLOBAL}, 354c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('a','k','h','n'), F_GLOBAL}, 355c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('r','p','h','f'), F_NONE}, 356c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('r','k','r','f'), F_GLOBAL}, 357c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('p','r','e','f'), F_NONE}, 358c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('b','l','w','f'), F_NONE}, 359c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('a','b','v','f'), F_NONE}, 360f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) {HB_TAG('h','a','l','f'), F_NONE}, 361c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('p','s','t','f'), F_NONE}, 362c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('v','a','t','u'), F_GLOBAL}, 363c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('c','j','c','t'), F_GLOBAL}, 364f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) {HB_TAG('c','f','a','r'), F_NONE}, 3655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Other features. 3675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * These features are applied all at once, after final_reordering. 368f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * Default Bengali font in Windows for example has intermixed 369f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * lookups for init,pres,abvs,blws features. 3705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 371c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('i','n','i','t'), F_NONE}, 372c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('p','r','e','s'), F_GLOBAL}, 373c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('a','b','v','s'), F_GLOBAL}, 374c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('b','l','w','s'), F_GLOBAL}, 375c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('p','s','t','s'), F_GLOBAL}, 376c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('h','a','l','n'), F_GLOBAL}, 3775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Positioning features, though we don't care about the types. */ 378c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('d','i','s','t'), F_GLOBAL}, 379c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('a','b','v','m'), F_GLOBAL}, 380c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) {HB_TAG('b','l','w','m'), F_GLOBAL}, 3815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 3825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* 3845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Must be in the same order as the indic_features array. 3855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 3865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum { 3875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _NUKT, 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _AKHN, 3895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RPHF, 3905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _RKRF, 3915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PREF, 3925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) BLWF, 3935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ABVF, 394f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) HALF, 3955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PSTF, 3965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _VATU, 397c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) _CJCT, 398f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) CFAR, 3995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) INIT, 4015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _PRES, 4025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _ABVS, 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _BLWS, 4045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _PSTS, 4055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _HALN, 4065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _DIST, 4075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _ABVM, 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _BLWM, 4095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) INDIC_NUM_FEATURES, 4115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) INDIC_BASIC_FEATURES = INIT /* Don't forget to update this! */ 4125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 4135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 4155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)setup_syllables (const hb_ot_shape_plan_t *plan, 4165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font, 4175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer); 4185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 4195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)initial_reordering (const hb_ot_shape_plan_t *plan, 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font, 4215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer); 4225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)final_reordering (const hb_ot_shape_plan_t *plan, 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font, 4255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer); 426f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)static void 427f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)clear_syllables (const hb_ot_shape_plan_t *plan, 428f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) hb_font_t *font, 429f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) hb_buffer_t *buffer); 4305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 4325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)collect_features_indic (hb_ot_shape_planner_t *plan) 4335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 4345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_ot_map_builder_t *map = &plan->map; 4355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Do this before any lookups have been applied. */ 4375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) map->add_gsub_pause (setup_syllables); 4385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 439c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) map->add_global_bool_feature (HB_TAG('l','o','c','l')); 4405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* The Indic specs do not require ccmp, but we apply it here since if 4415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * there is a use of it, it's typically at the beginning. */ 442c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) map->add_global_bool_feature (HB_TAG('c','c','m','p')); 4435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int i = 0; 4465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) map->add_gsub_pause (initial_reordering); 4475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (; i < INDIC_BASIC_FEATURES; i++) { 448c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) map->add_feature (indic_features[i].tag, 1, indic_features[i].flags | F_MANUAL_ZWJ); 4495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) map->add_gsub_pause (NULL); 4505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) map->add_gsub_pause (final_reordering); 4525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (; i < INDIC_NUM_FEATURES; i++) { 453c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) map->add_feature (indic_features[i].tag, 1, indic_features[i].flags | F_MANUAL_ZWJ); 4545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 455f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 456f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) map->add_global_bool_feature (HB_TAG('c','a','l','t')); 457f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) map->add_global_bool_feature (HB_TAG('c','l','i','g')); 458f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 459f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) map->add_gsub_pause (clear_syllables); 4605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 4635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)override_features_indic (hb_ot_shape_planner_t *plan) 4645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 465f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Uniscribe does not apply 'kern' in Khmer. */ 466c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (hb_options ().uniscribe_bug_compatible) 467f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 468f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) switch ((hb_tag_t) plan->props.script) 469f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 470f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) case HB_SCRIPT_KHMER: 471f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) plan->map.add_feature (HB_TAG('k','e','r','n'), 0, F_GLOBAL); 472f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) break; 473f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 474f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 4752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 476c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL); 4775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct would_substitute_feature_t 4815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 482f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) inline void init (const hb_ot_map_t *map, hb_tag_t feature_tag, bool zero_context_) 4835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 484f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) zero_context = zero_context_; 4855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) map->get_stage_lookups (0/*GSUB*/, 4865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) map->get_feature_stage (0/*GSUB*/, feature_tag), 4875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &lookups, &count); 4885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 490c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) inline bool would_substitute (const hb_codepoint_t *glyphs, 491c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) unsigned int glyphs_count, 492c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) hb_face_t *face) const 4935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 4945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 0; i < count; i++) 4952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (hb_ot_layout_lookup_would_substitute_fast (face, lookups[i].index, glyphs, glyphs_count, zero_context)) 4965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 4975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 4985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 5015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const hb_ot_map_t::lookup_map_t *lookups; 5025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int count; 503f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) bool zero_context; 5045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 5055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)struct indic_shape_plan_t 5075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 5085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ASSERT_POD (); 5095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) inline bool get_virama_glyph (hb_font_t *font, hb_codepoint_t *pglyph) const 5115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_codepoint_t glyph = virama_glyph; 5135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (unlikely (virama_glyph == (hb_codepoint_t) -1)) 5145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 5155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!config->virama || !font->get_glyph (config->virama, 0, &glyph)) 5165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) glyph = 0; 5175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Technically speaking, the spec says we should apply 'locl' to virama too. 5185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Maybe one day... */ 5195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Our get_glyph() function needs a font, so we can't get the virama glyph 5215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * during shape planning... Instead, overwrite it here. It's safe. Don't worry! */ 5225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (const_cast<indic_shape_plan_t *> (this))->virama_glyph = glyph; 5235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *pglyph = glyph; 5265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return glyph != 0; 5275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const indic_config_t *config; 5305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool is_old_spec; 5325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_codepoint_t virama_glyph; 5335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) would_substitute_feature_t rphf; 5355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) would_substitute_feature_t pref; 5365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) would_substitute_feature_t blwf; 5375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) would_substitute_feature_t pstf; 5385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_mask_t mask_array[INDIC_NUM_FEATURES]; 5405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 5415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void * 5435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)data_create_indic (const hb_ot_shape_plan_t *plan) 5445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 5455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) indic_shape_plan_t *indic_plan = (indic_shape_plan_t *) calloc (1, sizeof (indic_shape_plan_t)); 5465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (unlikely (!indic_plan)) 5475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 5485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) indic_plan->config = &indic_configs[0]; 5505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 1; i < ARRAY_LENGTH (indic_configs); i++) 5515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (plan->props.script == indic_configs[i].script) { 5525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) indic_plan->config = &indic_configs[i]; 5535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 5545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 5555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5565f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) indic_plan->is_old_spec = indic_plan->config->has_old_spec && ((plan->map.chosen_script[0] & 0x000000FFu) != '2'); 5575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) indic_plan->virama_glyph = (hb_codepoint_t) -1; 5585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 559f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Use zero-context would_substitute() matching for new-spec of the main 5605f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * Indic scripts, and scripts with one spec only, but not for old-specs. */ 5615f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) bool zero_context = !indic_plan->is_old_spec; 562f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->rphf.init (&plan->map, HB_TAG('r','p','h','f'), zero_context); 563f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->pref.init (&plan->map, HB_TAG('p','r','e','f'), zero_context); 564f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->blwf.init (&plan->map, HB_TAG('b','l','w','f'), zero_context); 565f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->pstf.init (&plan->map, HB_TAG('p','s','t','f'), zero_context); 5665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 0; i < ARRAY_LENGTH (indic_plan->mask_array); i++) 568c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) indic_plan->mask_array[i] = (indic_features[i].flags & F_GLOBAL) ? 569c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 0 : plan->map.get_1_mask (indic_features[i].tag); 5705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return indic_plan; 5725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 5735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 5755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)data_destroy_indic (void *data) 5765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 5775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) free (data); 5785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 5795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static indic_position_t 5815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)consonant_position_from_face (const indic_shape_plan_t *indic_plan, 582f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) const hb_codepoint_t consonant, 583f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) const hb_codepoint_t virama, 584c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) hb_face_t *face) 5855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 586c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* For old-spec, the order of glyphs is Consonant,Virama, 587c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * whereas for new-spec, it's Virama,Consonant. However, 588c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * some broken fonts (like Free Sans) simply copied lookups 589c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * from old-spec to new-spec without modification. 590c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * And oddly enough, Uniscribe seems to respect those lookups. 591c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Eg. in the sequence U+0924,U+094D,U+0930, Uniscribe finds 592c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * base at 0. The font however, only has lookups matching 593c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * 930,94D in 'blwf', not the expected 94D,930 (with new-spec 594c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * table). As such, we simply match both sequences. Seems 595c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * to work. */ 596f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) hb_codepoint_t glyphs[3] = {virama, consonant, virama}; 597f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->blwf.would_substitute (glyphs , 2, face) || 598f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->blwf.would_substitute (glyphs+1, 2, face)) 599c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return POS_BELOW_C; 600f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->pstf.would_substitute (glyphs , 2, face) || 601f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->pstf.would_substitute (glyphs+1, 2, face)) 602f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return POS_POST_C; 603f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int pref_len = indic_plan->config->pref_len; 604f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if ((pref_len == PREF_LEN_2 && 605f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) (indic_plan->pref.would_substitute (glyphs , 2, face) || 606f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->pref.would_substitute (glyphs+1, 2, face))) 607f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) || (pref_len == PREF_LEN_1 && 608f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->pref.would_substitute (glyphs+1, 1, face))) 609c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return POS_POST_C; 6105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return POS_BASE_C; 6115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum syllable_type_t { 6155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) consonant_syllable, 6165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) vowel_syllable, 6175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) standalone_cluster, 6185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) symbol_cluster, 6195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) broken_cluster, 6205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) non_indic_cluster, 6215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 6225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "hb-ot-shape-complex-indic-machine.hh" 6245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 6275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)setup_masks_indic (const hb_ot_shape_plan_t *plan HB_UNUSED, 6285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer, 6295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font HB_UNUSED) 6305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HB_BUFFER_ALLOCATE_VAR (buffer, indic_category); 6325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HB_BUFFER_ALLOCATE_VAR (buffer, indic_position); 6335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* We cannot setup masks here. We save information about characters 6355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * and setup masks later on in a pause-callback. */ 6365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int count = buffer->len; 6385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_glyph_info_t *info = buffer->info; 6395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 0; i < count; i++) 6405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) set_indic_properties (info[i]); 6415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 6445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, 6455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font HB_UNUSED, 6465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer) 6475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) find_syllables (buffer); 6495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static int 6525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)compare_indic_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb) 6535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int a = pa->indic_position(); 6555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int b = pb->indic_position(); 6565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return a < b ? -1 : a == b ? 0 : +1; 6585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 6635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)update_consonant_positions (const hb_ot_shape_plan_t *plan, 6645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font, 6655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer) 6665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; 6685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 669f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->config->base_pos != BASE_POS_LAST) 670f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return; 671f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 672f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) hb_codepoint_t virama; 673f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->get_virama_glyph (font, &virama)) 6745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 6755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_face_t *face = font->face; 6765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int count = buffer->len; 6775f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_glyph_info_t *info = buffer->info; 6785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 0; i < count; i++) 6795f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (info[i].indic_position() == POS_BASE_C) 6805f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 6815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_codepoint_t consonant = info[i].codepoint; 6825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) info[i].indic_position() = consonant_position_from_face (indic_plan, consonant, virama, face); 6835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 6855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 6865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Rules from: 6895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx */ 6905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 6915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 6922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, 6932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_face_t *face, 6942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_buffer_t *buffer, 6955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int start, unsigned int end) 6965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 6975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; 6985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t *info = buffer->info; 6995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 1. Find base consonant: 7025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 7035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The shaping engine finds the base consonant of the syllable, using the 7045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * following algorithm: starting from the end of the syllable, move backwards 7055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * until a consonant is found that does not have a below-base or post-base 7065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * form (post-base forms have to follow below-base forms), or that is not a 7075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * pre-base reordering Ra, or arrive at the first consonant. The consonant 7085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * stopped at will be the base. 7095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 7105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * o If the syllable starts with Ra + Halant (in a script that has Reph) 7115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * and has more than one consonant, Ra is excluded from candidates for 7125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * base consonants. 7135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 7145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int base = end; 7165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool has_reph = false; 7175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 7195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 7205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * and has more than one consonant, Ra is excluded from candidates for 7215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * base consonants. */ 7225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int limit = start; 723f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->config->reph_pos != REPH_POS_DONT_CARE && 724f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->mask_array[RPHF] && 7255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) start + 3 <= end && 7262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) ( 7275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (indic_plan->config->reph_mode == REPH_MODE_IMPLICIT && !is_joiner (info[start + 2])) || 7285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (indic_plan->config->reph_mode == REPH_MODE_EXPLICIT && info[start + 2].indic_category() == OT_ZWJ) 7295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) )) 7305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 7312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* See if it matches the 'rphf' feature. */ 7325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_codepoint_t glyphs[3] = {info[start].codepoint, 7335f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) info[start + 1].codepoint, 7345f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) indic_plan->config->reph_mode == REPH_MODE_EXPLICIT ? 7355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) info[start + 2].codepoint : 0}; 7365f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (indic_plan->rphf.would_substitute (glyphs, 2, face) || 7375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) (indic_plan->config->reph_mode == REPH_MODE_EXPLICIT && 7385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) indic_plan->rphf.would_substitute (glyphs, 3, face))) 7392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) { 7402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) limit += 2; 7412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) while (limit < end && is_joiner (info[limit])) 7422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) limit++; 7432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) base = start; 7442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) has_reph = true; 7452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 7462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } else if (indic_plan->config->reph_mode == REPH_MODE_LOG_REPHA && info[start].indic_category() == OT_Repha) 7472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) { 7482a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) limit += 1; 7492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) while (limit < end && is_joiner (info[limit])) 7502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) limit++; 7512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) base = start; 7522a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) has_reph = true; 7532a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 7545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) switch (indic_plan->config->base_pos) 7565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 7572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) default: 7582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) assert (false); 7592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* fallthrough */ 7602a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 7615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case BASE_POS_LAST: 7625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 7635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> starting from the end of the syllable, move backwards */ 7645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int i = end; 7655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool seen_below = false; 7665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) do { 7675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) i--; 7685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> until a consonant is found */ 7695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (is_consonant (info[i])) 7705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 7715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> that does not have a below-base or post-base form 7725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * (post-base forms have to follow below-base forms), */ 7735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[i].indic_position() != POS_BELOW_C && 7745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (info[i].indic_position() != POS_POST_C || seen_below)) 7755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 7765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base = i; 7775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 7785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[i].indic_position() == POS_BELOW_C) 7805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) seen_below = true; 7815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> or that is not a pre-base reordering Ra, 7835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 7845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IMPLEMENTATION NOTES: 7855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 786c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Our pre-base reordering Ra's are marked POS_POST_C, so will be skipped 7875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * by the logic above already. 7885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 7895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> or arrive at the first consonant. The consonant stopped at will 7915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * be the base. */ 7925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base = i; 7935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 7945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 7955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 7965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* A ZWJ after a Halant stops the base search, and requests an explicit 7975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * half form. 7985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * A ZWJ before a Halant, requests a subjoined form instead, and hence 7995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * search continues. This is particularly important for Bengali 8002a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * sequence Ra,H,Ya that should form Ya-Phalaa by subjoining Ya. */ 8015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (start < i && 8025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].indic_category() == OT_ZWJ && 8035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i - 1].indic_category() == OT_H) 8045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 8055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } while (i > limit); 8075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 8095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 810f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) case BASE_POS_LAST_SINHALA: 8115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 812f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Sinhala base positioning is slightly different from main Indic, in that: 8135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * 1. Its ZWJ behavior is different, 814f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * 2. We don't need to look into the font for consonant positions. 815f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) */ 8165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!has_reph) 8185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base = limit; 8195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Find the last base consonant that is not blocked by ZWJ. If there is 8215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * a ZWJ right before a base consonant, that would request a subjoined form. */ 8225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = limit; i < end; i++) 823f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (is_consonant (info[i])) 8245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 8255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (limit < i && info[i - 1].indic_category() == OT_ZWJ) 8265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 8275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 8285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base = i; 8295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Mark all subsequent consonants as below. */ 8325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = base + 1; i < end; i++) 833f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (is_consonant (info[i])) 834f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) info[i].indic_position() = POS_BELOW_C; 835f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 836f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) break; 837f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 838f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) case BASE_POS_FIRST: 839f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 840f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* The first consonant is always the base. */ 841f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 842f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) assert (indic_plan->config->reph_mode == REPH_MODE_VIS_REPHA); 843f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) assert (!has_reph); 844f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 845f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) base = start; 846f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 847f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Mark all subsequent consonants as below. */ 848f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int i = base + 1; i < end; i++) 849f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (is_consonant (info[i])) 8505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].indic_position() = POS_BELOW_C; 8515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 8535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> If the syllable starts with Ra + Halant (in a script that has Reph) 8565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * and has more than one consonant, Ra is excluded from candidates for 8575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * base consonants. 8585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Only do this for unforced Reph. (ie. not for Ra,H,ZWJ. */ 860c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (has_reph && base == start && limit - base <= 2) { 8615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Have no other consonant, so Reph is not formed and Ra becomes base. */ 8625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) has_reph = false; 8635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 8655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 2. Decompose and reorder Matras: 8685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Each matra and any syllable modifier sign in the cluster are moved to the 8705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * appropriate position relative to the consonant(s) in the cluster. The 8715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * shaping engine decomposes two- or three-part matras into their constituent 8725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * parts before any repositioning. Matra characters are classified by which 8735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * consonant in a conjunct they have affinity for and are reordered to the 8745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * following positions: 8755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * o Before first half form in the syllable 8775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * o After subjoined consonants 8785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * o After post-form consonant 8795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * o After main consonant (for above marks) 8805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IMPLEMENTATION NOTES: 8825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The normalize() routine has already decomposed matras for us, so we don't 8845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * need to worry about that. 8855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 8865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 3. Reorder marks to canonical order: 8895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Adjacent nukta and halant or nukta and vedic sign are always repositioned 8915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * if necessary, so that the nukta is first. 8925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * IMPLEMENTATION NOTES: 8945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 8955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * We don't need to do this: the normalize() routine already did this for us. 8965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 8975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 8995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Reorder characters */ 9005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = start; i < base; i++) 9025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].indic_position() = MIN (POS_PRE_C, (indic_position_t) info[i].indic_position()); 9035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (base < end) 9055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[base].indic_position() = POS_BASE_C; 9065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Mark final consonants. A final consonant is one appearing after a matra, 9085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * like in Khmer. */ 9095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = base + 1; i < end; i++) 9105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[i].indic_category() == OT_M) { 9115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int j = i + 1; j < end; j++) 9125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (is_consonant (info[j])) { 9135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[j].indic_position() = POS_FINAL_C; 9145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 9155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 9175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Handle beginning Ra */ 9205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (has_reph) 9215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[start].indic_position() = POS_RA_TO_BECOME_REPH; 9225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* For old-style Indic script tags, move the first post-base Halant after 92403b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * last consonant. 92503b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * 92603b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * Reports suggest that in some scripts Uniscribe does this only if there 92703b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * is *not* a Halant after last consonant already (eg. Kannada), while it 92803b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * does it unconditionally in other scripts (eg. Malayalam). We don't 92903b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * currently know about other scripts, so we single out Malayalam for now. 93003b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * 93103b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * Kannada test case: 93203b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * U+0C9A,U+0CCD,U+0C9A,U+0CCD 93303b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * With some versions of Lohit Kannada. 93403b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * https://bugs.freedesktop.org/show_bug.cgi?id=59118 93503b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * 93603b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * Malayalam test case: 93703b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * U+0D38,U+0D4D,U+0D31,U+0D4D,U+0D31,U+0D4D 93803b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) * With lohit-ttf-20121122/Lohit-Malayalam.ttf 93903b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) */ 94003b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) if (indic_plan->is_old_spec) 94103b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) { 94203b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) bool disallow_double_halants = buffer->props.script != HB_SCRIPT_MALAYALAM; 9435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = base + 1; i < end; i++) 94403b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) if (info[i].indic_category() == OT_H) 94503b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) { 9465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int j; 9475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (j = end - 1; j > i; j--) 94803b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) if (is_consonant (info[j]) || 94903b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) (disallow_double_halants && info[j].indic_category() == OT_H)) 9505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 951c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (info[j].indic_category() != OT_H && j > i) { 9525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Move Halant to after last consonant. */ 9535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t t = info[i]; 9545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memmove (&info[i], &info[i + 1], (j - i) * sizeof (info[0])); 9555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[j] = t; 9565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 9585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Attach misc marks to previous char to move with them. */ 9625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) indic_position_t last_pos = POS_START; 9645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = start; i < end; i++) 9655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 966f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if ((FLAG (info[i].indic_category()) & (JOINER_FLAGS | FLAG (OT_N) | FLAG (OT_RS) | MEDIAL_FLAGS | HALANT_OR_COENG_FLAGS))) 9675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].indic_position() = last_pos; 9692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (unlikely (info[i].indic_category() == OT_H && 9705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].indic_position() == POS_PRE_M)) 9715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 9725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 9735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Uniscribe doesn't move the Halant with Left Matra. 9745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * TEST: U+092B,U+093F,U+094DE 9752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * We follow. This is important for the Sinhala 9762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * U+0DDA split matra since it decomposes to U+0DD9,U+0DCA 9772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * where U+0DD9 is a left matra and U+0DCA is the virama. 9782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * We don't want to move the virama with the left matra. 9792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * TEST: U+0D9A,U+0DDA 9805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 9815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int j = i; j > start; j--) 9825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[j - 1].indic_position() != POS_PRE_M) { 9835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].indic_position() = info[j - 1].indic_position(); 9845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 9855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (info[i].indic_position() != POS_SMVD) { 9885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_pos = (indic_position_t) info[i].indic_position(); 9895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 9915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 992f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* For post-base consonants let them own anything before them 993f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * since the last consonant or matra. */ 9945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 995f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int last = base; 9965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = base + 1; i < end; i++) 997f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (is_consonant (info[i])) 998f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 999f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int j = last + 1; j < i; j++) 1000f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (info[j].indic_position() < POS_SMVD) 10015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[j].indic_position() = info[i].indic_position(); 1002f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) last = i; 1003f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } else if (info[i].indic_category() == OT_M) 1004f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) last = i; 10055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1007f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 10085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1009f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Use syllable() for sort accounting temporarily. */ 1010f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int syllable = info[start].syllable(); 1011f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int i = start; i < end; i++) 1012f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) info[i].syllable() = i - start; 1013f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 10145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Sit tight, rock 'n roll! */ 10155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_bubble_sort (info + start, end - start, compare_indic_order); 10165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Find base again */ 10175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base = end; 10185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = start; i < end; i++) 1019f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (info[i].indic_position() == POS_BASE_C) 1020f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 1021f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) base = i; 10225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 10235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1024f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Things are out-of-control for post base positions, they may shuffle 1025f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * around like crazy. In old-spec mode, we move halants around, so in 1026f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * that case merge all clusters after base. Otherwise, check the sort 1027f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * order and merge as needed. 1028f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * For pre-base stuff, we handle cluster issues in final reordering. */ 1029f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->is_old_spec || end - base > 127) 1030f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) buffer->merge_clusters (base, end); 1031f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) else 1032f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 1033f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Note! syllable() is a one-byte field. */ 1034f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int i = base; i < end; i++) 1035f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (info[i].syllable() != 255) 1036f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 1037f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int max = i; 1038f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int j = start + info[i].syllable(); 1039f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) while (j != i) 1040f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 1041f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) max = MAX (max, j); 1042f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int next = start + info[j].syllable(); 1043f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) info[j].syllable() = 255; /* So we don't process j later again. */ 1044f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) j = next; 1045f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 1046f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (i != max) 1047f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) buffer->merge_clusters (i, max + 1); 1048f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 1049f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 1050f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 1051f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Put syllable back in. */ 1052f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int i = start; i < end; i++) 1053f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) info[i].syllable() = syllable; 10545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Setup masks now */ 10575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 10595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_mask_t mask; 10605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Reph */ 10625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = start; i < end && info[i].indic_position() == POS_RA_TO_BECOME_REPH; i++) 10635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].mask |= indic_plan->mask_array[RPHF]; 10645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 10655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Pre-base */ 10665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mask = indic_plan->mask_array[HALF]; 1067f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (!indic_plan->is_old_spec && 1068f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->config->blwf_mode == BLWF_MODE_PRE_AND_POST) 1069f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) mask |= indic_plan->mask_array[BLWF]; 10705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = start; i < base; i++) 10715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].mask |= mask; 10725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Base */ 10735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mask = 0; 10745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (base < end) 10755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[base].mask |= mask; 10765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Post-base */ 10775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) mask = indic_plan->mask_array[BLWF] | indic_plan->mask_array[ABVF] | indic_plan->mask_array[PSTF]; 10785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = base + 1; i < end; i++) 10795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[i].mask |= mask; 10805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 10815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1082c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (indic_plan->is_old_spec && 1083c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) buffer->props.script == HB_SCRIPT_DEVANAGARI) 1084c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 1085c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* Old-spec eye-lash Ra needs special handling. From the 1086c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * spec: 1087c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * 1088c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * "The feature 'below-base form' is applied to consonants 1089c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * having below-base forms and following the base consonant. 1090c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * The exception is vattu, which may appear below half forms 1091c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * as well as below the base glyph. The feature 'below-base 1092c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * form' will be applied to all such occurrences of Ra as well." 1093c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * 1094c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Test case: U+0924,U+094D,U+0930,U+094d,U+0915 1095c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * with Sanskrit 2003 font. 1096c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * 1097c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * However, note that Ra,Halant,ZWJ is the correct way to 1098c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * request eyelash form of Ra, so we wouldbn't inhibit it 1099c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * in that sequence. 1100c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * 1101c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * Test case: U+0924,U+094D,U+0930,U+094d,U+200D,U+0915 1102c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) */ 1103c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) for (unsigned int i = start; i + 1 < base; i++) 1104c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (info[i ].indic_category() == OT_Ra && 1105c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) info[i+1].indic_category() == OT_H && 1106c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) (i + 2 == base || 1107c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) info[i+2].indic_category() != OT_ZWJ)) 1108c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 1109c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) info[i ].mask |= indic_plan->mask_array[BLWF]; 1110c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) info[i+1].mask |= indic_plan->mask_array[BLWF]; 1111c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 1112c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 1113c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 1114f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int pref_len = indic_plan->config->pref_len; 1115f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->mask_array[PREF] && base + pref_len < end) 11165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1117f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) assert (1 <= pref_len && pref_len <= 2); 11185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Find a Halant,Ra sequence and mark it for pre-base reordering processing. */ 1119f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int i = base + 1; i + pref_len - 1 < end; i++) { 1120f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) hb_codepoint_t glyphs[2]; 1121f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int j = 0; j < pref_len; j++) 1122f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) glyphs[j] = info[i + j].codepoint; 1123f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->pref.would_substitute (glyphs, pref_len, face)) 11245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1125f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int j = 0; j < pref_len; j++) 1126f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) info[i++].mask |= indic_plan->mask_array[PREF]; 11275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Mark the subsequent stuff with 'cfar'. Used in Khmer. 11295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Read the feature spec. 11305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * This allows distinguishing the following cases with MS Khmer fonts: 11315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * U+1784,U+17D2,U+179A,U+17D2,U+1782 11325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * U+1784,U+17D2,U+1782,U+17D2,U+179A 11335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1134f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (indic_plan->mask_array[CFAR]) 1135f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (; i < end; i++) 1136f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) info[i].mask |= indic_plan->mask_array[CFAR]; 11375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 11395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 11402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 11415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 11425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Apply ZWJ/ZWNJ effects */ 11445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = start + 1; i < end; i++) 11455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (is_joiner (info[i])) { 11465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool non_joiner = info[i].indic_category() == OT_ZWNJ; 11475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int j = i; 11485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) do { 11505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) j--; 11515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1152c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /* ZWJ/ZWNJ should disable CJCT. They do that by simply 1153c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * being there, since we don't skip them for the CJCT 1154c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) * feature (ie. F_MANUAL_ZWJ) */ 11555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* A ZWNJ disables HALF. */ 11575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (non_joiner) 11585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[j].mask &= ~indic_plan->mask_array[HALF]; 11595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } while (j > start && !is_consonant (info[j])); 11615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 11625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 11635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 11665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)initial_reordering_vowel_syllable (const hb_ot_shape_plan_t *plan, 11672a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_face_t *face, 11685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer, 11695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int start, unsigned int end) 11705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 11715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* We made the vowels look like consonants. So let's call the consonant logic! */ 11722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) initial_reordering_consonant_syllable (plan, face, buffer, start, end); 11735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 11745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 11765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)initial_reordering_standalone_cluster (const hb_ot_shape_plan_t *plan, 11772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_face_t *face, 11785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer, 11795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int start, unsigned int end) 11805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 11815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* We treat placeholder/dotted-circle as if they are consonants, so we 11825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * should just chain. Only if not in compatibility mode that is... */ 11835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1184c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (hb_options ().uniscribe_bug_compatible) 11855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 11865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* For dotted-circle, this is what Uniscribe does: 11875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * If dotted-circle is the last glyph, it just does nothing. 11885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Ie. It doesn't form Reph. */ 11895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (buffer->info[end - 1].indic_category() == OT_DOTTEDCIRCLE) 11905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 11915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 11925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) initial_reordering_consonant_syllable (plan, face, buffer, start, end); 11945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 11955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 11965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 11975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)initial_reordering_broken_cluster (const hb_ot_shape_plan_t *plan, 11982a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_face_t *face, 11995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer, 12005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int start, unsigned int end) 12015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 12025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* We already inserted dotted-circles, so just call the standalone_cluster. */ 12032a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) initial_reordering_standalone_cluster (plan, face, buffer, start, end); 12045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 12055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 12075f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)initial_reordering_symbol_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED, 12085f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_face_t *face HB_UNUSED, 12095f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_buffer_t *buffer HB_UNUSED, 12105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) unsigned int start HB_UNUSED, unsigned int end HB_UNUSED) 1211f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles){ 1212f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Nothing to do right now. If we ever switch to using the output 1213f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * buffer in the reordering process, we'd need to next_glyph() here. */ 1214f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)} 1215f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 1216f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)static void 12175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)initial_reordering_non_indic_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED, 12182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_face_t *face HB_UNUSED, 12195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer HB_UNUSED, 12205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int start HB_UNUSED, unsigned int end HB_UNUSED) 12215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 12225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Nothing to do right now. If we ever switch to using the output 12235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * buffer in the reordering process, we'd need to next_glyph() here. */ 12245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 12255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 12285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)initial_reordering_syllable (const hb_ot_shape_plan_t *plan, 12292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_face_t *face, 12305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer, 12315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int start, unsigned int end) 12325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 12335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F); 12345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) switch (syllable_type) { 12352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) case consonant_syllable: initial_reordering_consonant_syllable (plan, face, buffer, start, end); return; 12362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) case vowel_syllable: initial_reordering_vowel_syllable (plan, face, buffer, start, end); return; 12372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) case standalone_cluster: initial_reordering_standalone_cluster (plan, face, buffer, start, end); return; 12385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case symbol_cluster: initial_reordering_symbol_cluster (plan, face, buffer, start, end); return; 12392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) case broken_cluster: initial_reordering_broken_cluster (plan, face, buffer, start, end); return; 12402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) case non_indic_cluster: initial_reordering_non_indic_cluster (plan, face, buffer, start, end); return; 12415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 12425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 12435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline void 12452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED, 12465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font, 12475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer) 12485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 12495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Note: This loop is extra overhead, but should not be measurable. */ 12505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool has_broken_syllables = false; 12515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int count = buffer->len; 12525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) hb_glyph_info_t *info = buffer->info; 12535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 0; i < count; i++) 12545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if ((info[i].syllable() & 0x0F) == broken_cluster) 12555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 12565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) has_broken_syllables = true; 12575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 12585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 12595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (likely (!has_broken_syllables)) 12605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 12615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_codepoint_t dottedcircle_glyph; 12645f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!font->get_glyph (0x25CCu, 0, &dottedcircle_glyph)) 12655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 12665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12672a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_glyph_info_t dottedcircle = {0}; 12685f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dottedcircle.codepoint = 0x25CCu; 12695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) set_indic_properties (dottedcircle); 12705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dottedcircle.codepoint = dottedcircle_glyph; 12715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->clear_output (); 12735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 12745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->idx = 0; 12755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int last_syllable = 0; 12765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (buffer->idx < buffer->len) 12775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 12785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int syllable = buffer->cur().syllable(); 12795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F); 12805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (unlikely (last_syllable != syllable && syllable_type == broken_cluster)) 12815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 12822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) last_syllable = syllable; 12832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 12845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t info = dottedcircle; 12855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info.cluster = buffer->cur().cluster; 12865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info.mask = buffer->cur().mask; 12875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info.syllable() = buffer->cur().syllable(); 128803b57e008b61dfcb1fbad3aea950ae0e001748b0Torne (Richard Coles) /* TODO Set glyph_props? */ 12892a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 12902a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* Insert dottedcircle after possible Repha. */ 12912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) while (buffer->idx < buffer->len && 12922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) last_syllable == buffer->cur().syllable() && 12932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) buffer->cur().indic_category() == OT_Repha) 12942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) buffer->next_glyph (); 12952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 12965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->output_info (info); 12975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 12982a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) else 12992a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) buffer->next_glyph (); 13005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 13015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 13025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->swap_buffers (); 13035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 13045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 13055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 13065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)initial_reordering (const hb_ot_shape_plan_t *plan, 13075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_font_t *font, 13085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer) 13095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 13105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) update_consonant_positions (plan, font, buffer); 13115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) insert_dotted_circles (plan, font, buffer); 13125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 13135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t *info = buffer->info; 13145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int count = buffer->len; 13155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (unlikely (!count)) return; 13165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int last = 0; 13175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int last_syllable = info[0].syllable(); 13185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 1; i < count; i++) 13195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (last_syllable != info[i].syllable()) { 13202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) initial_reordering_syllable (plan, font->face, buffer, last, i); 13215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last = i; 13225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_syllable = info[last].syllable(); 13235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 13242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) initial_reordering_syllable (plan, font->face, buffer, last, count); 13255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 13265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 13275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 13285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)final_reordering_syllable (const hb_ot_shape_plan_t *plan, 13295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer, 13305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int start, unsigned int end) 13315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 13325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) plan->data; 13335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t *info = buffer->info; 13345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 13355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 13365f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* This function relies heavily on halant glyphs. Lots of ligation 13375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * and possibly multiplication substitutions happened prior to this 13385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * phase, and that might have messed up our properties. Recover 13395f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * from a particular case of that where we're fairly sure that a 13405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * class of OT_H is desired but has been lost. */ 13415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (indic_plan->virama_glyph) 13425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 13435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) unsigned int virama_glyph = indic_plan->virama_glyph; 13445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (unsigned int i = start; i < end; i++) 13455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (info[i].codepoint == virama_glyph && 13465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) _hb_glyph_info_ligated (&info[i]) && 13475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) _hb_glyph_info_multiplied (&info[i])) 13485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 13495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* This will make sure that this glyph passes is_halant_or_coeng() test. */ 13505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) info[i].indic_category() = OT_H; 13515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) _hb_glyph_info_clear_ligated_and_multiplied (&info[i]); 13525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 13535f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 13545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 13555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 13565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 4. Final reordering: 13575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 13585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * After the localized forms and basic shaping forms GSUB features have been 13595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * applied (see below), the shaping engine performs some final glyph 13605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * reordering before applying all the remaining font features to the entire 13615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * cluster. 13625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 13635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 13645f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) bool try_pref = !!indic_plan->mask_array[PREF]; 13655f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 13665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Find base again */ 13675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int base; 13685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (base = start; base < end; base++) 13695f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (info[base].indic_position() >= POS_BASE_C) 13705f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 13715f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (try_pref && base + 1 < end && indic_plan->config->pref_len == 2) 13725f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 13735f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (unsigned int i = base + 1; i < end; i++) 13745f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if ((info[i].mask & indic_plan->mask_array[PREF]) != 0) 13755f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 13765f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!(_hb_glyph_info_substituted (&info[i]) && 13775f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) _hb_glyph_info_ligated_and_didnt_multiply (&info[i]))) 13785f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 13795f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* Ok, this was a 'pref' candidate but didn't form any. 13805f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) * Base is around here... */ 13815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) base = i; 13825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) while (base < end && is_halant_or_coeng (info[base])) 13835f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) base++; 13845f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) info[base].indic_position() = POS_BASE_C; 13855f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 13865f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) try_pref = false; 13875f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 13885f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) break; 13895f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 13905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 13915f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 13925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (start < base && info[base].indic_position() > POS_BASE_C) 13935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base--; 13945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 13955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1396c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (base == end && start < base && 13975f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) is_one_of (info[base - 1], FLAG (OT_ZWJ))) 1398c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) base--; 13995f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (base < end) 14005f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) while (start < base && 14015f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) is_one_of (info[base], (FLAG (OT_N) | HALANT_OR_COENG_FLAGS))) 14025f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) base--; 14035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* o Reorder matras: 14065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 14075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * If a pre-base matra character had been reordered before applying basic 14085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * features, the glyph can be moved closer to the main consonant based on 14095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * whether half-forms had been formed. Actual position for the matra is 14105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * defined as “after last standalone halant glyph, after initial matra 14115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * position and before the main consonant”. If ZWJ or ZWNJ follow this 14125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * halant, position is moved after it. 14135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 14145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (start + 1 < end && start < base) /* Otherwise there can't be any pre-base matra characters. */ 14165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 14175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* If we lost track of base, alas, position before last thingy. */ 14185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int new_pos = base == end ? base - 2 : base - 1; 14195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Malayalam / Tamil do not have "half" forms or explicit virama forms. 14215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The glyphs formed by 'half' are Chillus or ligated explicit viramas. 14225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * We want to position matra after them. 14235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 14245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (buffer->props.script != HB_SCRIPT_MALAYALAM && buffer->props.script != HB_SCRIPT_TAMIL) 14255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 14265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (new_pos > start && 14275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) !(is_one_of (info[new_pos], (FLAG (OT_M) | HALANT_OR_COENG_FLAGS)))) 14285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_pos--; 14295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* If we found no Halant we are done. 14315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Otherwise only proceed if the Halant does 14325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * not belong to the Matra itself! */ 14335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (is_halant_or_coeng (info[new_pos]) && 14345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[new_pos].indic_position() != POS_PRE_M) 14355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 14365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 14375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_pos + 1 < end && is_joiner (info[new_pos + 1])) 14385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_pos++; 14395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 14405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) else 14415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_pos = start; /* No move. */ 14425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 14435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (start < new_pos && info[new_pos].indic_position () != POS_PRE_M) 14455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 14465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Now go see if there's actually any matras... */ 14475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = new_pos; i > start; i--) 14485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[i - 1].indic_position () == POS_PRE_M) 14495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 14505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int old_pos = i - 1; 14515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t tmp = info[old_pos]; 14525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memmove (&info[old_pos], &info[old_pos + 1], (new_pos - old_pos) * sizeof (info[0])); 14535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[new_pos] = tmp; 1454c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (old_pos < base && base <= new_pos) /* Shouldn't actually happen. */ 1455c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) base--; 1456f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) buffer->merge_clusters (new_pos, MIN (end, base + 1)); 14575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_pos--; 14585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 14595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 14605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = start; i < base; i++) 14615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[i].indic_position () == POS_PRE_M) { 14625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->merge_clusters (i, MIN (end, base + 1)); 14635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 14645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 14655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 14665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 14675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* o Reorder reph: 14705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 14715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Reph’s original position is always at the beginning of the syllable, 14725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * (i.e. it is not reordered at the character reordering stage). However, 14735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * it will be reordered according to the basic-forms shaping results. 14745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Possible positions for reph, depending on the script, are; after main, 14755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * before post-base consonant forms, and after post-base consonant forms. 14765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 14775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1478f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Two cases: 1479f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * 1480f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * - If repha is encoded as a sequence of characters (Ra,H or Ra,H,ZWJ), then 1481f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * we should only move it if the sequence ligated to the repha form. 1482f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * 1483f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * - If repha is encoded separately and in the logical position, we should only 1484f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * move it if it did NOT ligate. If it ligated, it's probably the font trying 1485f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * to make it work without the reordering. 1486f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) */ 14875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (start + 1 < end && 14885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[start].indic_position() == POS_RA_TO_BECOME_REPH && 1489f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) ((info[start].indic_category() == OT_Repha) ^ 14905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) _hb_glyph_info_ligated_and_didnt_multiply (&info[start]))) 14915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 14925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int new_reph_pos; 14935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reph_position_t reph_pos = indic_plan->config->reph_pos; 14945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1495f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) assert (reph_pos != REPH_POS_DONT_CARE); 14965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 14975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 1. If reph should be positioned after post-base consonant forms, 14985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * proceed to step 5. 14995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 15005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (reph_pos == REPH_POS_AFTER_POST) 15015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 15025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) goto reph_step_5; 15035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 15045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 15055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 2. If the reph repositioning class is not after post-base: target 15065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * position is after the first explicit halant glyph between the 15075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * first post-reph consonant and last main consonant. If ZWJ or ZWNJ 15085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * are following this halant, position is moved after it. If such 15095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * position is found, this is the target position. Otherwise, 15105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * proceed to the next step. 15115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 15125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Note: in old-implementation fonts, where classifications were 15135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * fixed in shaping engine, there was no case where reph position 15145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * will be found on this step. 15155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 15165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 15175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos = start + 1; 15185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos])) 15195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos++; 15205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1521c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) 1522c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 15235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 15245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 15255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos++; 15265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) goto reph_move; 15275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 15285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 15295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 15305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 3. If reph should be repositioned after the main consonant: find the 15315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * first consonant not ligated with main, or find the first 15325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * consonant that is not a potential pre-base reordering Ra. 15335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 15345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (reph_pos == REPH_POS_AFTER_MAIN) 15355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 15365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos = base; 15375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (new_reph_pos + 1 < end && info[new_reph_pos + 1].indic_position() <= POS_AFTER_MAIN) 15385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos++; 15395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_reph_pos < end) 15405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) goto reph_move; 15415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 15425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 15435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 4. If reph should be positioned before post-base consonant, find 15445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * first post-base classified consonant not ligated with main. If no 15455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * consonant is found, the target position should be before the 15465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * first matra, syllable modifier sign or vedic sign. 15475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 15485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* This is our take on what step 4 is trying to say (and failing, BADLY). */ 15495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (reph_pos == REPH_POS_AFTER_SUB) 15505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 15515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos = base; 15525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (new_reph_pos < end && 15535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !( FLAG (info[new_reph_pos + 1].indic_position()) & (FLAG (POS_POST_C) | FLAG (POS_AFTER_POST) | FLAG (POS_SMVD)))) 15545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos++; 15555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_reph_pos < end) 15565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) goto reph_move; 15575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 15585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 15595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 5. If no consonant is found in steps 3 or 4, move reph to a position 15605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * immediately before the first post-base matra, syllable modifier 15615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * sign or vedic sign that has a reordering class after the intended 15625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * reph position. For example, if the reordering position for reph 15635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * is post-main, it will skip above-base matras that also have a 15645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * post-main position. 15655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 15665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reph_step_5: 15675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 15685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Copied from step 2. */ 15695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos = start + 1; 15705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (new_reph_pos < base && !is_halant_or_coeng (info[new_reph_pos])) 15715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos++; 15725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1573c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (new_reph_pos < base && is_halant_or_coeng (info[new_reph_pos])) 1574c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 15755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* ->If ZWJ or ZWNJ are following this halant, position is moved after it. */ 15765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_reph_pos + 1 < base && is_joiner (info[new_reph_pos + 1])) 15775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos++; 15785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) goto reph_move; 15795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 15805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 15815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 15825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 6. Otherwise, reorder reph to the end of the syllable. 15835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 15845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 15855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos = end - 1; 15865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (new_reph_pos > start && info[new_reph_pos].indic_position() == POS_SMVD) 15875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos--; 15885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 15895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 15905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * If the Reph is to be ending up after a Matra,Halant sequence, 15915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * position it before that Halant so it can interact with the Matra. 15925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * However, if it's a plain Consonant,Halant we shouldn't do that. 15935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Uniscribe doesn't do this. 15945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * TEST: U+0930,U+094D,U+0915,U+094B,U+094D 15955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1596c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (!hb_options ().uniscribe_bug_compatible && 15975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unlikely (is_halant_or_coeng (info[new_reph_pos]))) { 15985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = base + 1; i < new_reph_pos; i++) 15995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[i].indic_category() == OT_M) { 16005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Ok, got it. */ 16015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_reph_pos--; 16025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) goto reph_move; 16055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reph_move: 16085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1609f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) buffer->merge_clusters (start, new_reph_pos + 1); 16105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Move */ 16125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t reph = info[start]; 16135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memmove (&info[start], &info[start + 1], (new_reph_pos - start) * sizeof (info[0])); 16145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[new_reph_pos] = reph; 1615c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (start < base && base <= new_reph_pos) 1616c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) base--; 16175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* o Reorder pre-base reordering consonants: 16225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 16235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * If a pre-base reordering consonant is found, reorder it according to 16245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * the following rules: 16255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 16265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (try_pref && base + 1 < end) /* Otherwise there can't be any pre-base reordering Ra. */ 16285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1629f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int pref_len = indic_plan->config->pref_len; 16305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = base + 1; i < end; i++) 16315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((info[i].mask & indic_plan->mask_array[PREF]) != 0) 16325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 16335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 1. Only reorder a glyph produced by substitution during application 16345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * of the <pref> feature. (Note that a font may shape a Ra consonant with 16355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * the feature generally but block it in certain contexts.) 16365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1637f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Note: We just check that something got substituted. We don't check that 1638f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * the <pref> feature actually did it... 1639f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * 1640f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * If pref len is longer than one, then only reorder if it ligated. If 1641f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * pref len is one, only reorder if it didn't ligate with other things. */ 1642f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (_hb_glyph_info_substituted (&info[i]) && 16435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ((pref_len == 1) ^ _hb_glyph_info_ligated_and_didnt_multiply (&info[i]))) 16445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 16455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 16465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 2. Try to find a target position the same way as for pre-base matra. 16475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * If it is found, reorder pre-base consonant glyph. 16485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 16495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 3. If position is not found, reorder immediately before main 16505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * consonant. 16515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 16525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int new_pos = base; 16545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Malayalam / Tamil do not have "half" forms or explicit virama forms. 16555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * The glyphs formed by 'half' are Chillus or ligated explicit viramas. 16565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * We want to position matra after them. 16575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 16585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (buffer->props.script != HB_SCRIPT_MALAYALAM && buffer->props.script != HB_SCRIPT_TAMIL) 16595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 16605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (new_pos > start && 16615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !(is_one_of (info[new_pos - 1], FLAG(OT_M) | HALANT_OR_COENG_FLAGS))) 16625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_pos--; 16635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1664f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* In Khmer coeng model, a H,Ra can go *after* matras. If it goes after a 16655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * split matra, it should be reordered to *before* the left part of such matra. */ 16665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_pos > start && info[new_pos - 1].indic_category() == OT_M) 16675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 16685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int old_pos = i; 16695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = base + 1; i < old_pos; i++) 16705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[i].indic_category() == OT_M) 16715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 16725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_pos--; 16735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 16745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_pos > start && is_halant_or_coeng (info[new_pos - 1])) 1679c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) { 16805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* -> If ZWJ or ZWNJ follow this halant, position is moved after it. */ 16815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (new_pos < end && is_joiner (info[new_pos])) 16825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) new_pos++; 1683c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) } 16845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 16865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int old_pos = i; 16875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->merge_clusters (new_pos, old_pos + 1); 16885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t tmp = info[old_pos]; 16895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memmove (&info[new_pos + 1], &info[new_pos], (old_pos - new_pos) * sizeof (info[0])); 16905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[new_pos] = tmp; 1691c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (new_pos <= base && base < old_pos) 1692c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) base++; 16935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 16965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 16975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 16995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* Apply 'init' to the Left Matra if it's a word start. */ 17025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (info[start].indic_position () == POS_PRE_M && 17035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (!start || 17045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !(FLAG (_hb_glyph_info_get_general_category (&info[start - 1])) & 17055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FLAG_RANGE (HB_UNICODE_GENERAL_CATEGORY_FORMAT, HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))) 17065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) info[start].mask |= indic_plan->mask_array[INIT]; 17075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /* 17105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Finish off the clusters and go home! 17115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 1712c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (hb_options ().uniscribe_bug_compatible) 17135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) { 1714f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) switch ((hb_tag_t) plan->props.script) 1715f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) { 1716f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) case HB_SCRIPT_TAMIL: 1717f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) case HB_SCRIPT_SINHALA: 1718f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) break; 1719f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 1720f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) default: 1721f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) /* Uniscribe merges the entire cluster... Except for Tamil & Sinhala. 1722f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * This means, half forms are submerged into the main consonants cluster. 1723f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * This is unnecessary, and makes cursor positioning harder, but that's what 1724f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) * Uniscribe does. */ 1725f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) buffer->merge_clusters (start, end); 1726f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) break; 1727f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 17285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 17295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 17305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void 17335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)final_reordering (const hb_ot_shape_plan_t *plan, 17342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_font_t *font HB_UNUSED, 17355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_buffer_t *buffer) 17365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 17375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int count = buffer->len; 17385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (unlikely (!count)) return; 17395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) hb_glyph_info_t *info = buffer->info; 17415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int last = 0; 17425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned int last_syllable = info[0].syllable(); 17435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned int i = 1; i < count; i++) 17445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (last_syllable != info[i].syllable()) { 17455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) final_reordering_syllable (plan, buffer, last, i); 17465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last = i; 17475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) last_syllable = info[last].syllable(); 17485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 17495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) final_reordering_syllable (plan, buffer, last, count); 17505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); 17525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); 17535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 17545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 17555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1756f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)static void 1757f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)clear_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, 1758f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) hb_font_t *font HB_UNUSED, 1759f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) hb_buffer_t *buffer) 1760f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles){ 1761f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) hb_glyph_info_t *info = buffer->info; 1762f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) unsigned int count = buffer->len; 1763f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (unsigned int i = 0; i < count; i++) 1764f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) info[i].syllable() = 0; 1765f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)} 1766f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 1767f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 17682a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static bool 17692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)decompose_indic (const hb_ot_shape_normalize_context_t *c, 17702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_codepoint_t ab, 17712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_codepoint_t *a, 17722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_codepoint_t *b) 17732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles){ 17742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) switch (ab) 17752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) { 17762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* Don't decompose these. */ 17775f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x0931u : return false; 17785f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x0B94u : return false; 17792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 17802a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 17812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* 17822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * Decompose split matras that don't have Unicode decompositions. 17832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) */ 17842a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 17855f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x0F77u : *a = 0x0FB2u; *b= 0x0F81u; return true; 17865f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x0F79u : *a = 0x0FB3u; *b= 0x0F81u; return true; 17875f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x17BEu : *a = 0x17C1u; *b= 0x17BEu; return true; 17885f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x17BFu : *a = 0x17C1u; *b= 0x17BFu; return true; 17895f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x17C0u : *a = 0x17C1u; *b= 0x17C0u; return true; 17905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x17C4u : *a = 0x17C1u; *b= 0x17C4u; return true; 17915f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x17C5u : *a = 0x17C1u; *b= 0x17C5u; return true; 17925f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x1925u : *a = 0x1920u; *b= 0x1923u; return true; 17935f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x1926u : *a = 0x1920u; *b= 0x1924u; return true; 17945f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x1B3Cu : *a = 0x1B42u; *b= 0x1B3Cu; return true; 17955f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x1112Eu : *a = 0x11127u; *b= 0x11131u; return true; 17965f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x1112Fu : *a = 0x11127u; *b= 0x11132u; return true; 17972a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#if 0 17982a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* This one has no decomposition in Unicode, but needs no decomposition either. */ 17995f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) /* case 0x0AC9u : return false; */ 18005f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x0B57u : *a = no decomp, -> RIGHT; return true; 18015f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x1C29u : *a = no decomp, -> LEFT; return true; 18025f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0xA9C0u : *a = no decomp, -> RIGHT; return true; 18035f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) case 0x111BuF : *a = no decomp, -> ABOVE; return true; 18042a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif 18052a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 18062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18075f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if ((ab == 0x0DDAu || hb_in_range (ab, 0x0DDCu, 0x0DDEu))) 18082a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) { 18092a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* 18102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * Sinhala split matras... Let the fun begin. 18112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * 18122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * These four characters have Unicode decompositions. However, Uniscribe 18132a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * decomposes them "Khmer-style", that is, it uses the character itself to 18142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * get the second half. The first half of all four decompositions is always 18152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * U+0DD9. 18162a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * 18172a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * Now, there are buggy fonts, namely, the widely used lklug.ttf, that are 18182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * broken with Uniscribe. But we need to support them. As such, we only 18192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * do the Uniscribe-style decomposition if the character is transformed into 18202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * its "sec.half" form by the 'pstf' feature. Otherwise, we fall back to 18212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * Unicode decomposition. 18222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * 18232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * Note that we can't unconditionally use Unicode decomposition. That would 18242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * break some other fonts, that are designed to work with Uniscribe, and 18252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * don't have positioning features for the Unicode-style decomposition. 18262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * 18272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * Argh... 18282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * 18292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * The Uniscribe behavior is now documented in the newly published Sinhala 18302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * spec in 2012: 18312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * 18322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) * http://www.microsoft.com/typography/OpenTypeDev/sinhala/intro.htm#shaping 18332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) */ 18342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const indic_shape_plan_t *indic_plan = (const indic_shape_plan_t *) c->plan->data; 18362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_codepoint_t glyph; 18382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1839c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (hb_options ().uniscribe_bug_compatible || 18402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) (c->font->get_glyph (ab, 0, &glyph) && 1841f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) indic_plan->pstf.would_substitute (&glyph, 1, c->font->face))) 18422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) { 18432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* Ok, safe to use Uniscribe-style decomposition. */ 18445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) *a = 0x0DD9u; 18452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) *b = ab; 18462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return true; 18472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 18482a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 18492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return c->unicode->decompose (ab, a, b); 18512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 18522a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18532a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)static bool 18542a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)compose_indic (const hb_ot_shape_normalize_context_t *c, 18552a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_codepoint_t a, 18562a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_codepoint_t b, 18572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) hb_codepoint_t *ab) 18582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles){ 18592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* Avoid recomposing split matras. */ 18602a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (c->unicode->general_category (a))) 18612a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return false; 18622a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) /* Composition-exclusion exceptions that we want to recompose. */ 18645f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (a == 0x09AFu && b == 0x09BCu) { *ab = 0x09DFu; return true; } 18652a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18662a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return c->unicode->compose (a, b, ab); 18672a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 18682a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 18705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const hb_ot_complex_shaper_t _hb_ot_complex_shaper_indic = 18715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles){ 18725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) "indic", 18735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) collect_features_indic, 18745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) override_features_indic, 18755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) data_create_indic, 18765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) data_destroy_indic, 18775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NULL, /* preprocess_text */ 187823730a6e56a168d1879203e4b3819bb36e3d8f1fTorne (Richard Coles) HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, 18792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) decompose_indic, 18802a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) compose_indic, 18815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) setup_masks_indic, 1882c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE, 18832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) false, /* fallback_position */ 18845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1885