lib/tamaxp.c

   1 /* tamaxp.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 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   SFNT_Table* glyf_table = &font->tables[sfnt->glyf_idx];
  25   glyf_Data* data = (glyf_Data*)glyf_table->data;
  26   FT_Byte* buf = maxp_table->buf;
  27
  28
  29   if (maxp_table->processed)
  30     return TA_Err_Ok;
  31
  32   if (maxp_table->len != MAXP_LEN)
  33     return FT_Err_Invalid_Table;
  34
  35   if (font->dehint)
  36   {
  37     buf[MAXP_MAX_ZONES_OFFSET] = 0;
  38     buf[MAXP_MAX_ZONES_OFFSET + 1] = 0;
  39     buf[MAXP_MAX_TWILIGHT_POINTS_OFFSET] = 0;
  40     buf[MAXP_MAX_TWILIGHT_POINTS_OFFSET + 1] = 0;
  41     buf[MAXP_MAX_STORAGE_OFFSET] = 0;
  42     buf[MAXP_MAX_STORAGE_OFFSET + 1] = 0;
  43     buf[MAXP_MAX_FUNCTION_DEFS_OFFSET] = 0;
  44     buf[MAXP_MAX_FUNCTION_DEFS_OFFSET + 1] = 0;
  45     buf[MAXP_MAX_INSTRUCTION_DEFS_OFFSET] = 0;
  46     buf[MAXP_MAX_INSTRUCTION_DEFS_OFFSET + 1] = 0;
  47     buf[MAXP_MAX_STACK_ELEMENTS_OFFSET] = 0;
  48     buf[MAXP_MAX_STACK_ELEMENTS_OFFSET + 1] = 0;
  49     buf[MAXP_MAX_INSTRUCTIONS_OFFSET] = 0;
  50     buf[MAXP_MAX_INSTRUCTIONS_OFFSET + 1] = 0;
  51   }
  52   else
  53   {
  54     if (sfnt->max_components && font->hint_composites)
  55     {
  56       buf[MAXP_NUM_GLYPHS] = HIGH(data->num_glyphs);
  57       buf[MAXP_NUM_GLYPHS + 1] = LOW(data->num_glyphs);
  58       buf[MAXP_MAX_COMPOSITE_POINTS] = HIGH(sfnt->max_composite_points);
  59       buf[MAXP_MAX_COMPOSITE_POINTS + 1] = LOW(sfnt->max_composite_points);
  60       buf[MAXP_MAX_COMPOSITE_CONTOURS] = HIGH(sfnt->max_composite_contours);
  61       buf[MAXP_MAX_COMPOSITE_CONTOURS + 1] = LOW(sfnt->max_composite_contours);
  62     }
  63
  64     buf[MAXP_MAX_ZONES_OFFSET] = 0;
  65     buf[MAXP_MAX_ZONES_OFFSET + 1] = 2;
  66     buf[MAXP_MAX_TWILIGHT_POINTS_OFFSET] = HIGH(sfnt->max_twilight_points);
  67     buf[MAXP_MAX_TWILIGHT_POINTS_OFFSET + 1] = LOW(sfnt->max_twilight_points);
  68     buf[MAXP_MAX_STORAGE_OFFSET] = HIGH(sfnt->max_storage);
  69     buf[MAXP_MAX_STORAGE_OFFSET + 1] = LOW(sfnt->max_storage);
  70     buf[MAXP_MAX_FUNCTION_DEFS_OFFSET] = 0;
  71     buf[MAXP_MAX_FUNCTION_DEFS_OFFSET + 1] = NUM_FDEFS;
  72     buf[MAXP_MAX_INSTRUCTION_DEFS_OFFSET] = 0;
  73     buf[MAXP_MAX_INSTRUCTION_DEFS_OFFSET + 1] = 0;
  74     buf[MAXP_MAX_STACK_ELEMENTS_OFFSET] = HIGH(sfnt->max_stack_elements);
  75     buf[MAXP_MAX_STACK_ELEMENTS_OFFSET + 1] = LOW(sfnt->max_stack_elements);
  76     buf[MAXP_MAX_INSTRUCTIONS_OFFSET] = HIGH(sfnt->max_instructions);
  77     buf[MAXP_MAX_INSTRUCTIONS_OFFSET + 1] = LOW(sfnt->max_instructions);
  78     buf[MAXP_MAX_COMPONENTS_OFFSET] = HIGH(sfnt->max_components);
  79     buf[MAXP_MAX_COMPONENTS_OFFSET + 1] = LOW(sfnt->max_components);
  80   }
  81
  82   maxp_table->checksum = TA_table_compute_checksum(maxp_table->buf,
  83                                                    maxp_table->len);
  84   maxp_table->processed = 1;
  85
  86   return TA_Err_Ok;
  87 }
  88
  89 /* end of tamaxp.c */