The Tor Browser: gfx/harfbuzz/src/hb-ot-shape-complex-hebrew.cc@925c144e1f1f

     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  */

    27 #include "hb-ot-shape-complex-private.hh"

    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 0x05D0..0x05EA;

    39    * Note that some letters do not have a dagesh presForm encoded.

    40    */

    41   static const hb_codepoint_t sDageshForms[0x05EA - 0x05D0 + 1] = {

    42     0xFB30, /* ALEF */

    43     0xFB31, /* BET */

    44     0xFB32, /* GIMEL */

    45     0xFB33, /* DALET */

    46     0xFB34, /* HE */

    47     0xFB35, /* VAV */

    48     0xFB36, /* ZAYIN */

    49     0x0000, /* HET */

    50     0xFB38, /* TET */

    51     0xFB39, /* YOD */

    52     0xFB3A, /* FINAL KAF */

    53     0xFB3B, /* KAF */

    54     0xFB3C, /* LAMED */

    55     0x0000, /* FINAL MEM */

    56     0xFB3E, /* MEM */

    57     0x0000, /* FINAL NUN */

    58     0xFB40, /* NUN */

    59     0xFB41, /* SAMEKH */

    60     0x0000, /* AYIN */

    61     0xFB43, /* FINAL PE */

    62     0xFB44, /* PE */

    63     0x0000, /* FINAL TSADI */

    64     0xFB46, /* TSADI */

    65     0xFB47, /* QOF */

    66     0xFB48, /* RESH */

    67     0xFB49, /* SHIN */

    68     0xFB4A /* TAV */

    69   };

    71   bool found = c->unicode->compose (a, b, ab);

    73   if (!found)

    74   {

    75       /* Special-case Hebrew presentation forms that are excluded from

    76        * standard normalization, but wanted for old fonts. */

    77       switch (b) {

    78       case 0x05B4: /* HIRIQ */

    79 	  if (a == 0x05D9) { /* YOD */

    80 	      *ab = 0xFB1D;

    81 	      found = true;

    82 	  }

    83 	  break;

    84       case 0x05B7: /* patah */

    85 	  if (a == 0x05F2) { /* YIDDISH YOD YOD */

    86 	      *ab = 0xFB1F;

    87 	      found = true;

    88 	  } else if (a == 0x05D0) { /* ALEF */

    89 	      *ab = 0xFB2E;

    90 	      found = true;

    91 	  }

    92 	  break;

    93       case 0x05B8: /* QAMATS */

    94 	  if (a == 0x05D0) { /* ALEF */

    95 	      *ab = 0xFB2F;

    96 	      found = true;

    97 	  }

    98 	  break;

    99       case 0x05B9: /* HOLAM */

   100 	  if (a == 0x05D5) { /* VAV */

   101 	      *ab = 0xFB4B;

   102 	      found = true;

   103 	  }

   104 	  break;

   105       case 0x05BC: /* DAGESH */

   106 	  if (a >= 0x05D0 && a <= 0x05EA) {

   107 	      *ab = sDageshForms[a - 0x05D0];

   108 	      found = (*ab != 0);

   109 	  } else if (a == 0xFB2A) { /* SHIN WITH SHIN DOT */

   110 	      *ab = 0xFB2C;

   111 	      found = true;

   112 	  } else if (a == 0xFB2B) { /* SHIN WITH SIN DOT */

   113 	      *ab = 0xFB2D;

   114 	      found = true;

   115 	  }

   116 	  break;

   117       case 0x05BF: /* RAFE */

   118 	  switch (a) {

   119 	  case 0x05D1: /* BET */

   120 	      *ab = 0xFB4C;

   121 	      found = true;

   122 	      break;

   123 	  case 0x05DB: /* KAF */

   124 	      *ab = 0xFB4D;

   125 	      found = true;

   126 	      break;

   127 	  case 0x05E4: /* PE */

   128 	      *ab = 0xFB4E;

   129 	      found = true;

   130 	      break;

   131 	  }

   132 	  break;

   133       case 0x05C1: /* SHIN DOT */

   134 	  if (a == 0x05E9) { /* SHIN */

   135 	      *ab = 0xFB2A;

   136 	      found = true;

   137 	  } else if (a == 0xFB49) { /* SHIN WITH DAGESH */

   138 	      *ab = 0xFB2C;

   139 	      found = true;

   140 	  }

   141 	  break;

   142       case 0x05C2: /* SIN DOT */

   143 	  if (a == 0x05E9) { /* SHIN */

   144 	      *ab = 0xFB2B;

   145 	      found = true;

   146 	  } else if (a == 0xFB49) { /* SHIN WITH DAGESH */

   147 	      *ab = 0xFB2D;

   148 	      found = true;

   149 	  }

   150 	  break;

   151       }

   152   }

   154   return found;

   155 }

   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_DEFAULT,

   171   true, /* fallback_position */

   172 };

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