trfn.c

   1 #include <ctype.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include "sbuf.h"
   6 #include "tab.h"
   7 #include "trfn.h"
   8 #include "trfn_ch.h"
   9
  10 #define WX(w)           (((w) < 0 ? (w) - trfn_div / 2 : (w) + trfn_div / 2) / trfn_div)
  11 #define LEN(a)          ((sizeof(a) / sizeof((a)[0])))
  12 #define HEXDIGS         "0123456789abcdef"
  13 #define GNLEN           32
  14 #define AGLLEN          (8 * 1024)
  15
  16 static struct sbuf sbuf_char;   /* charset section */
  17 static struct sbuf sbuf_kern;   /* kernpairs section */
  18 static int trfn_div;            /* divisor of widths */
  19 static int trfn_swid;           /* space width */
  20 static char trfn_ligs[1024];    /* font ligatures */
  21 static char trfn_trname[256];   /* font troff name */
  22 static char trfn_psname[256];   /* font ps name */
  23
  24 /* adobe glyphlist mapping */
  25 static char agl_key[AGLLEN][GNLEN];
  26 static char agl_val[AGLLEN][GNLEN];
  27 static int agl_n;
  28
  29 /* lookup tables */
  30 static struct tab *tab_agl;
  31 static struct tab *tab_alts;
  32 static struct tab *tab_ctyp;
  33
  34 static void pututf8(char **d, int c)
  35 {
  36         int l;
  37         if (c > 0xffff) {
  38                 *(*d)++ = 0xf0 | (c >> 18);
  39                 l = 3;
  40         } else if (c > 0x7ff) {
  41                 *(*d)++ = 0xe0 | (c >> 12);
  42                 l = 2;
  43         } else if (c > 0x7f) {
  44                 *(*d)++ = 0xc0 | (c >> 6);
  45                 l = 1;
  46         } else {
  47                 *(*d)++ = c > 0 ? c : ' ';
  48                 l = 0;
  49         }
  50         while (l--)
  51                 *(*d)++ = 0x80 | ((c >> (l * 6)) & 0x3f);
  52         **d = '\0';
  53 }
  54
  55 static int hexval(char *s, int len)
  56 {
  57         char *digs = HEXDIGS;
  58         int n = 0;
  59         int i;
  60         for (i = 0; i < len; i++) {
  61                 if (s[i] && strchr(digs, tolower(s[i])))
  62                         n = n * 16 + (strchr(digs, tolower(s[i])) - digs);
  63                 else
  64                         break;
  65         }
  66         return len == 1 ? n << 4 : n;
  67 }
  68
  69 static int agl_read(char *path)
  70 {
  71         FILE *fin = fopen(path, "r");
  72         char ln[GNLEN * 8];
  73         char val[GNLEN];
  74         char *s, *d;
  75         int i;
  76         if (!fin)
  77                 return 1;
  78         while (fgets(ln, sizeof(ln), fin)) {
  79                 s = strchr(ln, ';');
  80                 if (ln[0] == '#' || !s)
  81                         continue;
  82                 *s++ = '\0';
  83                 d = val;
  84                 while (s && *s) {
  85                         while (*s == ' ')
  86                                 s++;
  87                         pututf8(&d, hexval(s, 6));
  88                         s = strchr(s, ' ');
  89                 }
  90                 *d = '\0';
  91                 strcpy(agl_key[agl_n], ln);
  92                 strcpy(agl_val[agl_n], val);
  93                 agl_n++;
  94         }
  95         fclose(fin);
  96         tab_agl = tab_alloc(agl_n);
  97         for (i = 0; i < agl_n; i++)
  98                 tab_put(tab_agl, agl_key[i], agl_val[i]);
  99         return 0;
 100 }
 101
 102 static char *agl_map(char *s)
 103 {
 104         return tab_get(tab_agl, s);
 105 }
 106
 107 static int achar_map(char *name)
 108 {
 109         int i;
 110         for (i = 0; i < LEN(achars); i++) {
 111                 struct achar *a = &achars[i];
 112                 if (!strncmp(a->name, name, strlen(a->name))) {
 113                         char *postfix = name + strlen(a->name);
 114                         if (!*postfix)
 115                                 return a->c;
 116                         if (!strcmp("isolated", postfix))
 117                                 return a->s ? a->s : a->c;
 118                         if (!strcmp("initial", postfix))
 119                                 return a->i ? a->i : a->c;
 120                         if (!strcmp("medial", postfix))
 121                                 return a->m ? a->m : a->c;
 122                         if (!strcmp("final", postfix))
 123                                 return a->f ? a->f : a->c;
 124                 }
 125         }
 126         return 0;
 127 }
 128
 129 static int trfn_name(char *dst, char *src)
 130 {
 131         char ch[GNLEN];
 132         char *s;
 133         int i;
 134         if (src[0] == '.')
 135                 return 1;
 136         if (src[1] && strchr(src, '.'))
 137                 return 1;       /* ignore opentype features for now */
 138         while (*src && *src != '.') {
 139                 s = ch;
 140                 if (src[0] == '_')
 141                         src++;
 142                 while (*src && *src != '_' && *src != '.')
 143                         *s++ = *src++;
 144                 *s = '\0';
 145                 if (agl_map(ch)) {
 146                         strcpy(dst, agl_map(ch));
 147                         for (i = 0; i < LEN(agl_exceptions); i++)
 148                                 if (!strcmp(agl_exceptions[i][0], dst))
 149                                         strcpy(dst, agl_exceptions[i][1]);
 150                         dst = strchr(dst, '\0');
 151                 } else if (ch[0] == 'u' && ch[1] == 'n' && ch[2] == 'i') {
 152                         for (i = 0; strlen(ch + 3 + 4 * i) >= 4; i++)
 153                                 pututf8(&dst, hexval(ch + 3 + 4 * i, 4));
 154                 } else if (ch[0] == 'u' && ch[1] && strchr(HEXDIGS, tolower(ch[1]))) {
 155                         pututf8(&dst, hexval(ch + 1, 6));
 156                 } else if (achar_map(ch)) {
 157                         pututf8(&dst, achar_map(ch));
 158                 } else {
 159                         return 1;
 160                 }
 161         }
 162         return src[0];
 163 }
 164
 165 static void trfn_lig(char *c)
 166 {
 167         int i;
 168         for (i = 0; i < LEN(ligs); i++)
 169                 if (!strcmp(ligs[i], c))
 170                         sprintf(strchr(trfn_ligs, '\0'), "%s ", c);
 171 }
 172
 173 static int trfn_type(char *c)
 174 {
 175         struct ctype *t = tab_get(tab_ctyp, c);
 176         return t ? t->type : 3;
 177 }
 178
 179 void trfn_char(char *c, char *n, int wid, int typ)
 180 {
 181         char uc[GNLEN];
 182         char pos[GNLEN];
 183         char **a;
 184         if (trfn_name(uc, c))
 185                 strcpy(uc, "---");
 186         if (strchr(uc, ' ')) {          /* space not allowed in character names */
 187                 if (!trfn_swid && !strcmp(" ", uc))
 188                         trfn_swid = WX(wid);
 189                 return;
 190         }
 191         trfn_lig(uc);
 192         if (typ < 0)
 193                 typ = trfn_type(uc);
 194         strcpy(pos, c);
 195         if (n && atoi(n) >= 0 && atoi(n) < 256)
 196                 strcpy(pos, n);
 197         if (!n && !uc[1] && uc[0] >= 32 && uc[0] <= 125)
 198                 sprintf(pos, "%d", uc[0]);
 199         sbuf_printf(&sbuf_char, "%s\t%d\t%d\t%s\n", uc, WX(wid), typ, pos);
 200         a = tab_get(tab_alts, uc);
 201         while (a && *a)
 202                 sbuf_printf(&sbuf_char, "%s\t\"\n", *a++);
 203 }
 204
 205 void trfn_kern(char *c1, char *c2, int x)
 206 {
 207         char g1[GNLEN], g2[GNLEN];
 208         if (!trfn_name(g1, c1) && !trfn_name(g2, c2) && abs(WX(x)) > WX(20))
 209                 if (!strchr(g1, ' ') && !strchr(g2, ' '))
 210                         sbuf_printf(&sbuf_kern, "%s\t%s\t%d\n", g1, g2, WX(x));
 211 }
 212
 213 void trfn_trfont(char *name)
 214 {
 215         if (!trfn_trname[0])
 216                 strcpy(trfn_trname, name);
 217 }
 218
 219 void trfn_psfont(char *name)
 220 {
 221         if (!trfn_psname[0])
 222                 strcpy(trfn_psname, name);
 223 }
 224
 225 void trfn_print(void)
 226 {
 227         if (trfn_trname[0])
 228                 printf("name %s\n", trfn_trname);
 229         if (trfn_psname[0])
 230                 printf("fontname %s\n", trfn_psname);
 231         printf("spacewidth %d\n", trfn_swid);
 232         printf("ligatures %s 0\n", trfn_ligs);
 233         printf("charset\n");
 234         printf("%s", sbuf_buf(&sbuf_char));
 235         printf("kernpairs\n");
 236         printf("%s", sbuf_buf(&sbuf_kern));
 237 }
 238
 239 void trfn_init(int res)
 240 {
 241         int i;
 242         trfn_div = 7200 / res;
 243         agl_read("glyphlist.txt");
 244         sbuf_init(&sbuf_char);
 245         sbuf_init(&sbuf_kern);
 246         tab_alts = tab_alloc(LEN(alts));
 247         tab_ctyp = tab_alloc(LEN(ctype));
 248         for (i = 0; i < LEN(alts); i++)
 249                 tab_put(tab_alts, alts[i][0], alts[i] + 1);
 250         for (i = 0; i < LEN(ctype); i++)
 251                 tab_put(tab_ctyp, ctype[i].ch, &ctype[i]);
 252 }
 253
 254 void trfn_done(void)
 255 {
 256         sbuf_done(&sbuf_char);
 257         sbuf_done(&sbuf_kern);
 258         tab_free(tab_alts);
 259         tab_free(tab_ctyp);
 260         if (tab_agl)
 261                 tab_free(tab_agl);
 262 }