178 lines
4.9 KiB
C++
178 lines
4.9 KiB
C++
/*
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* Copyright © 2018 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_SHAPER_MYANMAR_HH
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#define HB_OT_SHAPER_MYANMAR_HH
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#include "hb.hh"
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#include "hb-ot-shaper-indic.hh"
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/* buffer var allocations */
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#define myanmar_category() indic_category() /* myanmar_category_t */
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#define myanmar_position() indic_position() /* myanmar_position_t */
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/* Note: This enum is duplicated in the -machine.rl source file.
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* Not sure how to avoid duplication. */
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enum myanmar_category_t {
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OT_As = 18, /* Asat */
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OT_D0 = 20, /* Digit zero */
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OT_DB = OT_N, /* Dot below */
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OT_GB = OT_PLACEHOLDER,
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OT_MH = 21, /* Various consonant medial types */
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OT_MR = 22, /* Various consonant medial types */
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OT_MW = 23, /* Various consonant medial types */
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OT_MY = 24, /* Various consonant medial types */
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OT_PT = 25, /* Pwo and other tones */
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//OT_VAbv = 26,
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//OT_VBlw = 27,
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//OT_VPre = 28,
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//OT_VPst = 29,
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OT_VS = 30, /* Variation selectors */
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OT_P = 31, /* Punctuation */
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OT_D = 32, /* Digits except zero */
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OT_ML = 33, /* Various consonant medial types */
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};
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using myanmar_position_t = indic_position_t;
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static inline void
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set_myanmar_properties (hb_glyph_info_t &info)
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{
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hb_codepoint_t u = info.codepoint;
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unsigned int type = hb_indic_get_categories (u);
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unsigned int cat = type & 0xFFu;
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myanmar_position_t pos = (myanmar_position_t) (type >> 8);
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/* Myanmar
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* https://docs.microsoft.com/en-us/typography/script-development/myanmar#analyze
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*/
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if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xFE00u, 0xFE0Fu)))
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cat = OT_VS;
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switch (u)
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{
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case 0x104Eu:
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cat = OT_C; /* The spec says C, IndicSyllableCategory doesn't have. */
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break;
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case 0x002Du: case 0x00A0u: case 0x00D7u: case 0x2012u:
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case 0x2013u: case 0x2014u: case 0x2015u: case 0x2022u:
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case 0x25CCu: case 0x25FBu: case 0x25FCu: case 0x25FDu:
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case 0x25FEu:
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cat = OT_GB;
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break;
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case 0x1004u: case 0x101Bu: case 0x105Au:
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cat = OT_Ra;
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break;
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case 0x1032u: case 0x1036u:
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cat = OT_A;
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break;
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case 0x1039u:
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cat = OT_H;
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break;
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case 0x103Au:
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cat = OT_As;
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break;
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case 0x1041u: case 0x1042u: case 0x1043u: case 0x1044u:
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case 0x1045u: case 0x1046u: case 0x1047u: case 0x1048u:
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case 0x1049u: case 0x1090u: case 0x1091u: case 0x1092u:
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case 0x1093u: case 0x1094u: case 0x1095u: case 0x1096u:
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case 0x1097u: case 0x1098u: case 0x1099u:
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cat = OT_D;
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break;
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case 0x1040u:
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cat = OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */
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break;
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case 0x103Eu:
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cat = OT_MH;
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break;
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case 0x1060u:
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cat = OT_ML;
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break;
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case 0x103Cu:
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cat = OT_MR;
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break;
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case 0x103Du: case 0x1082u:
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cat = OT_MW;
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break;
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case 0x103Bu: case 0x105Eu: case 0x105Fu:
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cat = OT_MY;
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break;
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case 0x1063u: case 0x1064u: case 0x1069u: case 0x106Au:
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case 0x106Bu: case 0x106Cu: case 0x106Du: case 0xAA7Bu:
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cat = OT_PT;
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break;
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case 0x1038u: case 0x1087u: case 0x1088u: case 0x1089u:
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case 0x108Au: case 0x108Bu: case 0x108Cu: case 0x108Du:
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case 0x108Fu: case 0x109Au: case 0x109Bu: case 0x109Cu:
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cat = OT_SM;
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break;
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case 0x104Au: case 0x104Bu:
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cat = OT_P;
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break;
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case 0xAA74u: case 0xAA75u: case 0xAA76u:
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/* https://github.com/harfbuzz/harfbuzz/issues/218 */
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cat = OT_C;
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break;
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}
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if (cat == OT_M)
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{
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switch ((int) pos)
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{
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case POS_PRE_C: cat = (myanmar_category_t) OT_VPre;
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pos = POS_PRE_M; break;
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case POS_ABOVE_C: cat = (myanmar_category_t) OT_VAbv; break;
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case POS_BELOW_C: cat = (myanmar_category_t) OT_VBlw; break;
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case POS_POST_C: cat = (myanmar_category_t) OT_VPst; break;
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}
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}
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info.myanmar_category() = cat;
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info.myanmar_position() = pos;
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}
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#endif /* HB_OT_SHAPER_MYANMAR_HH */
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