lib/tagasp.c

   1 /* tagasp.c */
   2
   3 /*
   4  * Copyright (C) 2011-2022 by Werner Lemberg.
   5  *
   6  * This file is part of the ttfautohint library, and may only be used,
   7  * modified, and distributed under the terms given in `COPYING'.  By
   8  * continuing to use, modify, or distribute this file you indicate that you
   9  * have read `COPYING' and understand and accept it fully.
  10  *
  11  * The file `COPYING' mentioned in the previous paragraph is distributed
  12  * with the ttfautohint library.
  13  */
  14
  15
  16 #include "ta.h"
  17
  18
  19 static FT_Error
  20 TA_table_build_gasp(FT_Byte** gasp)
  21 {
  22   FT_Byte* buf;
  23
  24
  25   buf = (FT_Byte*)malloc(GASP_LEN);
  26   if (!buf)
  27     return FT_Err_Out_Of_Memory;
  28
  29   /* version */
  30   buf[0] = 0x00;
  31   buf[1] = 0x01;
  32
  33   /* one range */
  34   buf[2] = 0x00;
  35   buf[3] = 0x01;
  36
  37   /* entry valid for all sizes */
  38   buf[4] = 0xFF;
  39   buf[5] = 0xFF;
  40   buf[6] = 0x00;
  41   buf[7] = 0x0F; /* always use grayscale rendering with grid-fitting, */
  42                  /* symmetric grid-fitting and symmetric smoothing */
  43
  44   *gasp = buf;
  45
  46   return TA_Err_Ok;
  47 }
  48
  49
  50 FT_Error
  51 TA_sfnt_build_gasp_table(SFNT* sfnt,
  52                          FONT* font)
  53 {
  54   FT_Error error;
  55
  56   FT_Byte* gasp_buf;
  57
  58
  59   error = TA_sfnt_add_table_info(sfnt);
  60   if (error)
  61     goto Exit;
  62
  63   if (font->gasp_idx != MISSING)
  64   {
  65     sfnt->table_infos[sfnt->num_table_infos - 1] = font->gasp_idx;
  66     goto Exit;
  67   }
  68
  69   error = TA_table_build_gasp(&gasp_buf);
  70   if (error)
  71     goto Exit;
  72
  73   /* in case of success, `gasp_buf' gets linked */
  74   /* and is eventually freed in `TA_font_unload' */
  75   error = TA_font_add_table(font,
  76                             &sfnt->table_infos[sfnt->num_table_infos - 1],
  77                             TTAG_gasp, GASP_LEN, gasp_buf);
  78   if (error)
  79     free(gasp_buf);
  80   else
  81     font->gasp_idx = sfnt->table_infos[sfnt->num_table_infos - 1];
  82
  83 Exit:
  84   return error;
  85 }
  86
  87 /* end of tagasp.c */