kc3-lang/harfbuzz/src/hb-ot-shaper-myanmar.hh

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• Hash : 20a61ca4
  Author :
  Date : 2022-06-04T08:35:22
  

  [myanmar] Fold D category into GB
  
  Trying to free a byte the buffer vars, for caching of lookups.
  
  Part of https://github.com/harfbuzz/harfbuzz/issues/3633
  

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• src/hb-ot-shaper-myanmar.hh

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

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