src/tamaxp.c

   1 /* tamaxp.c */
   2
   3 /*
   4  * Copyright (C) 2011 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 FT_Error
  20 TA_sfnt_update_maxp_table(SFNT* sfnt,
  21                           FONT* font)
  22 {
  23   SFNT_Table* maxp_table = &font->tables[sfnt->maxp_idx];
  24   FT_Byte* buf = maxp_table->buf;
  25
  26
  27   if (maxp_table->processed)
  28     return TA_Err_Ok;
  29
  30   if (maxp_table->len != MAXP_LEN)
  31     return FT_Err_Invalid_Table;
  32
  33   buf[MAXP_MAX_ZONES_OFFSET] = 0;
  34   buf[MAXP_MAX_ZONES_OFFSET + 1] = 2;
  35   buf[MAXP_MAX_TWILIGHT_POINTS_OFFSET] = HIGH(sfnt->max_twilight_points);
  36   buf[MAXP_MAX_TWILIGHT_POINTS_OFFSET + 1] = LOW(sfnt->max_twilight_points);
  37   buf[MAXP_MAX_STORAGE_OFFSET] = HIGH(sfnt->max_storage);
  38   buf[MAXP_MAX_STORAGE_OFFSET + 1] = LOW(sfnt->max_storage);
  39   buf[MAXP_MAX_FUNCTION_DEFS_OFFSET] = 0;
  40   buf[MAXP_MAX_FUNCTION_DEFS_OFFSET + 1] = NUM_FDEFS;
  41   buf[MAXP_MAX_INSTRUCTION_DEFS_OFFSET] = 0;
  42   buf[MAXP_MAX_INSTRUCTION_DEFS_OFFSET + 1] = 0;
  43   buf[MAXP_MAX_STACK_ELEMENTS_OFFSET] = HIGH(sfnt->max_stack_elements);
  44   buf[MAXP_MAX_STACK_ELEMENTS_OFFSET + 1] = LOW(sfnt->max_stack_elements);
  45   buf[MAXP_MAX_INSTRUCTIONS_OFFSET] = HIGH(sfnt->max_instructions);
  46   buf[MAXP_MAX_INSTRUCTIONS_OFFSET + 1] = LOW(sfnt->max_instructions);
  47
  48   maxp_table->checksum = TA_table_compute_checksum(maxp_table->buf,
  49                                                    maxp_table->len);
  50   maxp_table->processed = 1;
  51
  52   return TA_Err_Ok;
  53 }
  54
  55 /* end of tamaxp.c */