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convttf: Allow default glyph to be specified

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Formerly fixed at the first glpyh in the converted font; now it can be
explicitly set.  This mirrors the functionality available from using the
DEFAULT_CHAR property of BDF fonts

Change-Id: Ibd754faff3fd4d393c4781e8faa685612e3301f0
This commit is contained in:
Solomon Peachy 2026-05-28 20:47:13 -04:00
parent 35270d08e9
commit e1534d8065
1 changed files with 22 additions and 6 deletions
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28
tools/convttf.c
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@ -94,6 +94,7 @@ int pct = 0; /* display ttc table if it is not zero. */
FT_Long max_char = 0x10FFFF;
int pixel_size = 15;
FT_Long start_char = 0;
FT_Long defaultchar = 0;
FT_Long limit_char;
FT_Long firstchar = 0;
FT_Long lastchar;
@ -192,8 +193,9 @@ void usage(void)
" default output-file is: \n"
" <font-size>-<internal postscript-name of input-file>.fnt.\n"
"Options:\n"
" -s N Start output at character encodings >= N\n"
" -l N Limit output to character encodings <= N\n"
" -s N Start output at character encodings >= N (default is first glyph in font)\n"
" -l N Limit output to character encodings <= N (default is last glyph in font)\n"
" -D N Default character to use for those not present in font (default is first glyph)\n"
" -p N Font size N in pixel (default N=15)\n"
" -c N Character separation in pixel.Insert space between lines.\n"
" -x Trim glyphs horizontally of nearly empty space\n"
@ -712,7 +714,7 @@ void convttf(char* path, char* destfile, FT_Long face_index)
if (code <= firstchar)
firstchar = code;
}
export_font.header.defaultchar = firstchar;
export_font.header.defaultchar = defaultchar - firstchar;
export_font.header.firstchar = firstchar;
export_font.header.size = lastchar - firstchar + 1;
export_font.header.nbits = idx;
@ -764,11 +766,12 @@ void convttf(char* path, char* destfile, FT_Long face_index)
charindex = getcharindex( face, code);
if ( !charindex )
{
FT_Long defchar = defaultchar - firstchar;
if ( use_long_offset )
export_font.offset_long[code - firstchar] = export_font.offset_long[0];
export_font.offset_long[code - firstchar] = export_font.offset_long[defchar];
else
export_font.offset[code - firstchar] = export_font.offset[0];
export_font.width[code - firstchar] = export_font.width[0];
export_font.offset[code - firstchar] = export_font.offset[defchar];
export_font.width[code - firstchar] = export_font.width[defchar];
continue;
}
@ -1141,6 +1144,19 @@ void getopts(int *pac, char ***pav)
while (*p && *p != ' ')
p++;
break;
case 'D': /* set default char*/
if (*p) {
start_char = atol(p);
while (*p && *p != ' ')
p++;
}
else {
av++; ac--;
if (ac > 0)
defaultchar = atol(av[0]);
}
break;
case 'x':
trimming = 1;
while (*p && *p != ' ')