extension/SDL2_ttf-2.0.14/external/freetype-2.4.12/src/autofit/afindic.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  afindic.c                                                              */
   4 /*                                                                         */
   5 /*    Auto-fitter hinting routines for Indic scripts (body).               */
   6 /*                                                                         */
   7 /*  Copyright 2007, 2011-2013 by                                           */
   8 /*  Rahul Bhalerao <rahul.bhalerao@redhat.com>, <b.rahul.pm@gmail.com>.    */
   9 /*                                                                         */
  10 /*  This file is part of the FreeType project, and may only be used,       */
  11 /*  modified, and distributed under the terms of the FreeType project      */
  12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13 /*  this file you indicate that you have read the license and              */
  14 /*  understand and accept it fully.                                        */
  15 /*                                                                         */
  16 /***************************************************************************/
  17
  18
  19 #include "aftypes.h"
  20 #include "aflatin.h"
  21
  22
  23 #ifdef AF_CONFIG_OPTION_INDIC
  24
  25 #include "afindic.h"
  26 #include "aferrors.h"
  27 #include "afcjk.h"
  28
  29
  30 #ifdef AF_CONFIG_OPTION_USE_WARPER
  31 #include "afwarp.h"
  32 #endif
  33
  34
  35   static FT_Error
  36   af_indic_metrics_init( AF_CJKMetrics  metrics,
  37                          FT_Face        face )
  38   {
  39     /* skip blue zone init in CJK routines */
  40     FT_CharMap  oldmap = face->charmap;
  41
  42
  43     metrics->units_per_em = face->units_per_EM;
  44
  45     if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
  46       face->charmap = NULL;
  47     else
  48     {
  49       af_cjk_metrics_init_widths( metrics, face );
  50 #if 0
  51       /* either need indic specific blue_chars[] or just skip blue zones */
  52       af_cjk_metrics_init_blues( metrics, face, af_cjk_blue_chars );
  53 #endif
  54       af_cjk_metrics_check_digits( metrics, face );
  55     }
  56
  57     FT_Set_Charmap( face, oldmap );
  58
  59     return FT_Err_Ok;
  60   }
  61
  62
  63   static void
  64   af_indic_metrics_scale( AF_CJKMetrics  metrics,
  65                           AF_Scaler      scaler )
  66   {
  67     /* use CJK routines */
  68     af_cjk_metrics_scale( metrics, scaler );
  69   }
  70
  71
  72   static FT_Error
  73   af_indic_hints_init( AF_GlyphHints  hints,
  74                        AF_CJKMetrics  metrics )
  75   {
  76     /* use CJK routines */
  77     return af_cjk_hints_init( hints, metrics );
  78   }
  79
  80
  81   static FT_Error
  82   af_indic_hints_apply( AF_GlyphHints  hints,
  83                         FT_Outline*    outline,
  84                         AF_CJKMetrics  metrics )
  85   {
  86     /* use CJK routines */
  87     return af_cjk_hints_apply( hints, outline, metrics );
  88   }
  89
  90
  91   /*************************************************************************/
  92   /*************************************************************************/
  93   /*****                                                               *****/
  94   /*****                I N D I C   S C R I P T   C L A S S            *****/
  95   /*****                                                               *****/
  96   /*************************************************************************/
  97   /*************************************************************************/
  98
  99
 100   static const AF_Script_UniRangeRec  af_indic_uniranges[] =
 101   {
 102 #if 0
 103     AF_UNIRANGE_REC( 0x0100UL, 0xFFFFUL ),  /* why this? */
 104 #endif
 105     AF_UNIRANGE_REC( 0x0900UL, 0x0DFFUL),    /* Indic Range */
 106     AF_UNIRANGE_REC( 0x0F00UL, 0x0FFFUL),    /* Tibetan */
 107     AF_UNIRANGE_REC( 0x1900UL, 0x194FUL),    /* Limbu */
 108     AF_UNIRANGE_REC( 0x1B80UL, 0x1BBFUL),    /* Sundanese */
 109     AF_UNIRANGE_REC( 0x1C80UL, 0x1CDFUL),    /* Meetei Mayak */
 110     AF_UNIRANGE_REC( 0xA800UL, 0xA82FUL),    /* Syloti Nagri */
 111     AF_UNIRANGE_REC( 0x11800UL, 0x118DFUL),  /* Sharada */
 112     AF_UNIRANGE_REC(      0UL,      0UL)
 113   };
 114
 115
 116   AF_DEFINE_SCRIPT_CLASS( af_indic_script_class,
 117     AF_SCRIPT_INDIC,
 118     af_indic_uniranges,
 119     'o', /* XXX */
 120
 121     sizeof ( AF_CJKMetricsRec ),
 122
 123     (AF_Script_InitMetricsFunc) af_indic_metrics_init,
 124     (AF_Script_ScaleMetricsFunc)af_indic_metrics_scale,
 125     (AF_Script_DoneMetricsFunc) NULL,
 126
 127     (AF_Script_InitHintsFunc)   af_indic_hints_init,
 128     (AF_Script_ApplyHintsFunc)  af_indic_hints_apply
 129   )
 130
 131 #else /* !AF_CONFIG_OPTION_INDIC */
 132
 133   static const AF_Script_UniRangeRec  af_indic_uniranges[] =
 134   {
 135     { 0, 0 }
 136   };
 137
 138
 139   AF_DEFINE_SCRIPT_CLASS( af_indic_script_class,
 140     AF_SCRIPT_INDIC,
 141     af_indic_uniranges,
 142     0,
 143
 144     sizeof ( AF_CJKMetricsRec ),
 145
 146     (AF_Script_InitMetricsFunc) NULL,
 147     (AF_Script_ScaleMetricsFunc)NULL,
 148     (AF_Script_DoneMetricsFunc) NULL,
 149
 150     (AF_Script_InitHintsFunc)   NULL,
 151     (AF_Script_ApplyHintsFunc)  NULL
 152   )
 153
 154 #endif /* !AF_CONFIG_OPTION_INDIC */
 155
 156
 157 /* END */