third_party/harfbuzz-ng/src/hb-ot-shape-complex-hebrew.cc

   1 /*
   2  * Copyright © 2010,2012  Google, Inc.
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  *
  24  * Google Author(s): Behdad Esfahbod
  25  */
  26
  27 #include "hb-ot-shape-complex-private.hh"
  28
  29
  30 static bool
  31 compose_hebrew (const hb_ot_shape_normalize_context_t *c,
  32                 hb_codepoint_t  a,
  33                 hb_codepoint_t  b,
  34                 hb_codepoint_t *ab)
  35 {
  36   /* Hebrew presentation-form shaping.
  37    * https://bugzilla.mozilla.org/show_bug.cgi?id=728866
  38    * Hebrew presentation forms with dagesh, for characters U+05D0..05EA;
  39    * Note that some letters do not have a dagesh presForm encoded.
  40    */
  41   static const hb_codepoint_t sDageshForms[0x05EAu - 0x05D0u + 1] = {
  42     0xFB30u, /* ALEF */
  43     0xFB31u, /* BET */
  44     0xFB32u, /* GIMEL */
  45     0xFB33u, /* DALET */
  46     0xFB34u, /* HE */
  47     0xFB35u, /* VAV */
  48     0xFB36u, /* ZAYIN */
  49     0x0000u, /* HET */
  50     0xFB38u, /* TET */
  51     0xFB39u, /* YOD */
  52     0xFB3Au, /* FINAL KAF */
  53     0xFB3Bu, /* KAF */
  54     0xFB3Cu, /* LAMED */
  55     0x0000u, /* FINAL MEM */
  56     0xFB3Eu, /* MEM */
  57     0x0000u, /* FINAL NUN */
  58     0xFB40u, /* NUN */
  59     0xFB41u, /* SAMEKH */
  60     0x0000u, /* AYIN */
  61     0xFB43u, /* FINAL PE */
  62     0xFB44u, /* PE */
  63     0x0000u, /* FINAL TSADI */
  64     0xFB46u, /* TSADI */
  65     0xFB47u, /* QOF */
  66     0xFB48u, /* RESH */
  67     0xFB49u, /* SHIN */
  68     0xFB4Au /* TAV */
  69   };
  70
  71   bool found = c->unicode->compose (a, b, ab);
  72
  73   if (!found && !c->plan->has_mark)
  74   {
  75       /* Special-case Hebrew presentation forms that are excluded from
  76        * standard normalization, but wanted for old fonts. */
  77       switch (b) {
  78       case 0x05B4u: /* HIRIQ */
  79           if (a == 0x05D9u) { /* YOD */
  80               *ab = 0xFB1Du;
  81               found = true;
  82           }
  83           break;
  84       case 0x05B7u: /* patah */
  85           if (a == 0x05F2u) { /* YIDDISH YOD YOD */
  86               *ab = 0xFB1Fu;
  87               found = true;
  88           } else if (a == 0x05D0u) { /* ALEF */
  89               *ab = 0xFB2Eu;
  90               found = true;
  91           }
  92           break;
  93       case 0x05B8u: /* QAMATS */
  94           if (a == 0x05D0u) { /* ALEF */
  95               *ab = 0xFB2Fu;
  96               found = true;
  97           }
  98           break;
  99       case 0x05B9u: /* HOLAM */
 100           if (a == 0x05D5u) { /* VAV */
 101               *ab = 0xFB4Bu;
 102               found = true;
 103           }
 104           break;
 105       case 0x05BCu: /* DAGESH */
 106           if (a >= 0x05D0u && a <= 0x05EAu) {
 107               *ab = sDageshForms[a - 0x05D0u];
 108               found = (*ab != 0);
 109           } else if (a == 0xFB2Au) { /* SHIN WITH SHIN DOT */
 110               *ab = 0xFB2Cu;
 111               found = true;
 112           } else if (a == 0xFB2Bu) { /* SHIN WITH SIN DOT */
 113               *ab = 0xFB2Du;
 114               found = true;
 115           }
 116           break;
 117       case 0x05BFu: /* RAFE */
 118           switch (a) {
 119           case 0x05D1u: /* BET */
 120               *ab = 0xFB4Cu;
 121               found = true;
 122               break;
 123           case 0x05DBu: /* KAF */
 124               *ab = 0xFB4Du;
 125               found = true;
 126               break;
 127           case 0x05E4u: /* PE */
 128               *ab = 0xFB4Eu;
 129               found = true;
 130               break;
 131           }
 132           break;
 133       case 0x05C1u: /* SHIN DOT */
 134           if (a == 0x05E9u) { /* SHIN */
 135               *ab = 0xFB2Au;
 136               found = true;
 137           } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */
 138               *ab = 0xFB2Cu;
 139               found = true;
 140           }
 141           break;
 142       case 0x05C2u: /* SIN DOT */
 143           if (a == 0x05E9u) { /* SHIN */
 144               *ab = 0xFB2Bu;
 145               found = true;
 146           } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */
 147               *ab = 0xFB2Du;
 148               found = true;
 149           }
 150           break;
 151       }
 152   }
 153
 154   return found;
 155 }
 156
 157
 158 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_hebrew =
 159 {
 160   "hebrew",
 161   NULL, /* collect_features */
 162   NULL, /* override_features */
 163   NULL, /* data_create */
 164   NULL, /* data_destroy */
 165   NULL, /* preprocess_text */
 166   HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
 167   NULL, /* decompose */
 168   compose_hebrew,
 169   NULL, /* setup_masks */
 170   HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
 171   true, /* fallback_position */
 172 };