1  /****************************************************************************
       2   *
       3   * afindic.c
       4   *
       5   *   Auto-fitter hinting routines for Indic writing system (body).
       6   *
       7   * Copyright (C) 2007-2023 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  #include "afcjk.h"
      22  
      23  
      24  #ifdef AF_CONFIG_OPTION_INDIC
      25  
      26  #include "afindic.h"
      27  #include "aferrors.h"
      28  
      29  
      30    static FT_Error
      31    af_indic_metrics_init( AF_StyleMetrics  metrics_, /* AF_CJKMetrics */
      32                           FT_Face          face )
      33    {
      34      AF_CJKMetrics  metrics = (AF_CJKMetrics)metrics_;
      35  
      36  
      37      /* skip blue zone init in CJK routines */
      38      FT_CharMap  oldmap = face->charmap;
      39  
      40  
      41      metrics->units_per_em = face->units_per_EM;
      42  
      43      if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
      44        face->charmap = NULL;
      45      else
      46      {
      47        af_cjk_metrics_init_widths( metrics, face );
      48  #if 0
      49        /* either need indic specific blue_chars[] or just skip blue zones */
      50        af_cjk_metrics_init_blues( metrics, face, af_cjk_blue_chars );
      51  #endif
      52        af_cjk_metrics_check_digits( metrics, face );
      53      }
      54  
      55      face->charmap = oldmap;
      56      return FT_Err_Ok;
      57    }
      58  
      59  
      60    static void
      61    af_indic_metrics_scale( AF_StyleMetrics  metrics,
      62                            AF_Scaler        scaler )
      63    {
      64      /* use CJK routines */
      65      af_cjk_metrics_scale( metrics, scaler );
      66    }
      67  
      68  
      69    static FT_Error
      70    af_indic_hints_init( AF_GlyphHints    hints,
      71                         AF_StyleMetrics  metrics )
      72    {
      73      /* use CJK routines */
      74      return af_cjk_hints_init( hints, metrics );
      75    }
      76  
      77  
      78    static FT_Error
      79    af_indic_hints_apply( FT_UInt          glyph_index,
      80                          AF_GlyphHints    hints,
      81                          FT_Outline*      outline,
      82                          AF_StyleMetrics  metrics )
      83    {
      84      /* use CJK routines */
      85      return af_cjk_hints_apply( glyph_index, hints, outline, metrics );
      86    }
      87  
      88  
      89    /* Extract standard_width from writing system/script specific */
      90    /* metrics class.                                             */
      91  
      92    static void
      93    af_indic_get_standard_widths( AF_StyleMetrics  metrics_, /* AF_CJKMetrics */
      94                                  FT_Pos*          stdHW,
      95                                  FT_Pos*          stdVW )
      96    {
      97      AF_CJKMetrics  metrics = (AF_CJKMetrics)metrics_;
      98  
      99  
     100      if ( stdHW )
     101        *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
     102  
     103      if ( stdVW )
     104        *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
     105    }
     106  
     107  
     108    /*************************************************************************/
     109    /*************************************************************************/
     110    /*****                                                               *****/
     111    /*****                I N D I C   S C R I P T   C L A S S            *****/
     112    /*****                                                               *****/
     113    /*************************************************************************/
     114    /*************************************************************************/
     115  
     116  
     117    AF_DEFINE_WRITING_SYSTEM_CLASS(
     118      af_indic_writing_system_class,
     119  
     120      AF_WRITING_SYSTEM_INDIC,
     121  
     122      sizeof ( AF_CJKMetricsRec ),
     123  
     124      (AF_WritingSystem_InitMetricsFunc) af_indic_metrics_init,        /* style_metrics_init    */
     125      (AF_WritingSystem_ScaleMetricsFunc)af_indic_metrics_scale,       /* style_metrics_scale   */
     126      (AF_WritingSystem_DoneMetricsFunc) NULL,                         /* style_metrics_done    */
     127      (AF_WritingSystem_GetStdWidthsFunc)af_indic_get_standard_widths, /* style_metrics_getstdw */
     128  
     129      (AF_WritingSystem_InitHintsFunc)   af_indic_hints_init,          /* style_hints_init      */
     130      (AF_WritingSystem_ApplyHintsFunc)  af_indic_hints_apply          /* style_hints_apply     */
     131    )
     132  
     133  
     134  #else /* !AF_CONFIG_OPTION_INDIC */
     135  
     136  
     137    AF_DEFINE_WRITING_SYSTEM_CLASS(
     138      af_indic_writing_system_class,
     139  
     140      AF_WRITING_SYSTEM_INDIC,
     141  
     142      sizeof ( AF_CJKMetricsRec ),
     143  
     144      (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init    */
     145      (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale   */
     146      (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done    */
     147      (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */
     148  
     149      (AF_WritingSystem_InitHintsFunc)   NULL, /* style_hints_init      */
     150      (AF_WritingSystem_ApplyHintsFunc)  NULL  /* style_hints_apply     */
     151    )
     152  
     153  
     154  #endif /* !AF_CONFIG_OPTION_INDIC */
     155  
     156  
     157  /* END */