| 1 |
/* Copyright (c) 1992 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Polygonal font handling routines |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "standard.h" |
| 12 |
|
| 13 |
#include "font.h" |
| 14 |
|
| 15 |
#define galloc(nv) (GLYPH *)malloc(sizeof(GLYPH)+2*sizeof(GORD)*(nv)) |
| 16 |
|
| 17 |
|
| 18 |
extern char *libpath; /* list of library directories */ |
| 19 |
|
| 20 |
extern char *fgetword(); |
| 21 |
|
| 22 |
static FONT *fontlist = NULL; /* list of loaded fonts */ |
| 23 |
|
| 24 |
|
| 25 |
FONT * |
| 26 |
getfont(fname) /* return font fname */ |
| 27 |
char *fname; |
| 28 |
{ |
| 29 |
char buf[16]; |
| 30 |
FILE *fp; |
| 31 |
char *pathname, *err; |
| 32 |
unsigned wsum, hsum, ngly; |
| 33 |
int gn, ngv; |
| 34 |
register int gv; |
| 35 |
register GLYPH *g; |
| 36 |
GORD *gp; |
| 37 |
register FONT *f; |
| 38 |
|
| 39 |
for (f = fontlist; f != NULL; f = f->next) |
| 40 |
if (!strcmp(f->name, fname)) |
| 41 |
return(f); |
| 42 |
/* load the font file */ |
| 43 |
if ((pathname = getpath(fname, libpath, R_OK)) == NULL) { |
| 44 |
sprintf(errmsg, "cannot find font file \"%s\"", fname); |
| 45 |
error(USER, errmsg); |
| 46 |
} |
| 47 |
f = (FONT *)calloc(1, sizeof(FONT)); |
| 48 |
if (f == NULL) |
| 49 |
goto memerr; |
| 50 |
f->name = savestr(fname); |
| 51 |
if ((fp = fopen(pathname, "r")) == NULL) { |
| 52 |
sprintf(errmsg, "cannot open font file \"%s\"", |
| 53 |
pathname); |
| 54 |
error(SYSTEM, errmsg); |
| 55 |
} |
| 56 |
wsum = hsum = ngly = 0; |
| 57 |
while (fgetword(buf,sizeof(buf),fp) != NULL) { /* get each glyph */ |
| 58 |
if (!isint(buf)) |
| 59 |
goto nonint; |
| 60 |
gn = atoi(buf); |
| 61 |
if (gn < 1 || gn > 255) { |
| 62 |
err = "illegal"; |
| 63 |
goto fonterr; |
| 64 |
} |
| 65 |
if (f->fg[gn] != NULL) { |
| 66 |
err = "duplicate"; |
| 67 |
goto fonterr; |
| 68 |
} |
| 69 |
if (fgetword(buf,sizeof(buf),fp) == NULL || !isint(buf) || |
| 70 |
(ngv = atoi(buf)) < 0 || ngv > 32000) { |
| 71 |
err = "bad # vertices for"; |
| 72 |
goto fonterr; |
| 73 |
} |
| 74 |
g = galloc(ngv); |
| 75 |
if (g == NULL) |
| 76 |
goto memerr; |
| 77 |
g->nverts = ngv; |
| 78 |
g->left = g->right = g->top = g->bottom = 128; |
| 79 |
ngv *= 2; |
| 80 |
gp = gvlist(g); |
| 81 |
while (ngv--) { |
| 82 |
if (fgetword(buf,sizeof(buf),fp) == NULL || |
| 83 |
!isint(buf) || |
| 84 |
(gv = atoi(buf)) < 0 || gv > 255) { |
| 85 |
err = "bad vertex for"; |
| 86 |
goto fonterr; |
| 87 |
} |
| 88 |
*gp++ = gv; |
| 89 |
if (ngv & 1) { /* follow x limits */ |
| 90 |
if (gv < g->left) |
| 91 |
g->left = gv; |
| 92 |
else if (gv > g->right) |
| 93 |
g->right = gv; |
| 94 |
} else { /* follow y limits */ |
| 95 |
if (gv < g->bottom) |
| 96 |
g->bottom = gv; |
| 97 |
else if (gv > g->top) |
| 98 |
g->top = gv; |
| 99 |
} |
| 100 |
} |
| 101 |
if (g->right - g->left && g->top - g->bottom) { |
| 102 |
ngly++; |
| 103 |
wsum += g->right - g->left; |
| 104 |
hsum += g->top - g->bottom; |
| 105 |
} |
| 106 |
f->fg[gn] = g; |
| 107 |
} |
| 108 |
fclose(fp); |
| 109 |
if (ngly) { |
| 110 |
f->mwidth = wsum / ngly; |
| 111 |
f->mheight = hsum / ngly; |
| 112 |
} |
| 113 |
f->next = fontlist; |
| 114 |
return(fontlist = f); |
| 115 |
nonint: |
| 116 |
sprintf(errmsg, "non-integer in font file \"%s\"", pathname); |
| 117 |
error(USER, errmsg); |
| 118 |
fonterr: |
| 119 |
sprintf(errmsg, "%s character (%d) in font file \"%s\"", |
| 120 |
err, gn, pathname); |
| 121 |
error(USER, errmsg); |
| 122 |
memerr: |
| 123 |
error(SYSTEM, "out of memory in fontglyph"); |
| 124 |
} |
| 125 |
|
| 126 |
|
| 127 |
freefont(fname) /* free a font (free all if fname==NULL) */ |
| 128 |
char *fname; |
| 129 |
{ |
| 130 |
FONT head; |
| 131 |
register FONT *fl, *f; |
| 132 |
register int i; |
| 133 |
|
| 134 |
head.next = fontlist; |
| 135 |
fl = &head; |
| 136 |
while ((f = fl->next) != NULL) |
| 137 |
if (fname == NULL || !strcmp(fname, f->name)) { |
| 138 |
fl->next = f->next; |
| 139 |
for (i = 0; i < 256; i++) |
| 140 |
if (f->fg[i] != NULL) |
| 141 |
free((char *)f->fg[i]); |
| 142 |
freestr(f->name); |
| 143 |
free((char *)f); |
| 144 |
} else |
| 145 |
fl = f; |
| 146 |
fontlist = head.next; |
| 147 |
} |
| 148 |
|
| 149 |
|
| 150 |
int |
| 151 |
uniftext(sp, tp, f) /* uniformly space text line */ |
| 152 |
register short *sp; /* returned character spacing */ |
| 153 |
register char *tp; /* text line */ |
| 154 |
register FONT *f; /* font */ |
| 155 |
{ |
| 156 |
int linelen; |
| 157 |
|
| 158 |
linelen = *sp++ = 0; |
| 159 |
while (*tp) |
| 160 |
if (f->fg[*tp++&0xff] == NULL) |
| 161 |
*sp++ = 0; |
| 162 |
else |
| 163 |
linelen += *sp++ = 256; |
| 164 |
return(linelen); |
| 165 |
} |
| 166 |
|
| 167 |
|
| 168 |
int |
| 169 |
squeeztext(sp, tp, f, cis) /* squeeze text line */ |
| 170 |
short *sp; /* returned character spacing */ |
| 171 |
char *tp; /* text line */ |
| 172 |
FONT *f; /* font */ |
| 173 |
int cis; /* intercharacter spacing */ |
| 174 |
{ |
| 175 |
int linelen; |
| 176 |
register GLYPH *gp; |
| 177 |
|
| 178 |
gp = NULL; |
| 179 |
while (*tp && (gp = f->fg[*tp++&0xff]) == NULL) |
| 180 |
*sp++ = 0; |
| 181 |
cis /= 2; |
| 182 |
linelen = *sp = cis; |
| 183 |
while (gp != NULL) { |
| 184 |
if (gp->nverts) { /* regular character */ |
| 185 |
linelen += *sp++ += cis - gp->left; |
| 186 |
*sp = gp->right + cis; |
| 187 |
} else { /* space */ |
| 188 |
linelen += *sp++; |
| 189 |
*sp = f->mwidth; |
| 190 |
} |
| 191 |
gp = NULL; |
| 192 |
while (*tp && (gp = f->fg[*tp++&0xff]) == NULL) { |
| 193 |
linelen += *sp++; |
| 194 |
*sp = 0; |
| 195 |
} |
| 196 |
} |
| 197 |
linelen += *sp += cis; |
| 198 |
return(linelen); |
| 199 |
} |
| 200 |
|
| 201 |
|
| 202 |
int |
| 203 |
proptext(sp, tp, f, cis, nsi) /* space line proportionally */ |
| 204 |
short *sp; /* returned character spacing */ |
| 205 |
char *tp; /* text line */ |
| 206 |
FONT *f; /* font */ |
| 207 |
int cis; /* target intercharacter spacing */ |
| 208 |
int nsi; /* minimum number of spaces for indent */ |
| 209 |
{ |
| 210 |
register char *end, *tab; |
| 211 |
GLYPH *gp; |
| 212 |
short *nsp; |
| 213 |
int alen, len, width; |
| 214 |
/* start by squeezing it */ |
| 215 |
squeeztext(sp, tp, f, cis); |
| 216 |
/* now, realign spacing */ |
| 217 |
width = *sp++; |
| 218 |
while (*tp) { |
| 219 |
len = alen = 0; |
| 220 |
nsp = sp; |
| 221 |
for (end = tp; *end; end = tab) { |
| 222 |
tab = end + 1; |
| 223 |
alen += *nsp++; |
| 224 |
if (f->fg[*end&0xff]) { |
| 225 |
while ((gp = f->fg[*tab&0xff]) != NULL && |
| 226 |
gp->nverts == 0) { /* tab in */ |
| 227 |
alen += *nsp++; |
| 228 |
tab++; |
| 229 |
} |
| 230 |
len += tab - end; |
| 231 |
} |
| 232 |
if (nsi && tab - end > nsi) |
| 233 |
break; |
| 234 |
} |
| 235 |
len *= f->mwidth + cis; /* compute target length */ |
| 236 |
width += len; |
| 237 |
len -= alen; /* necessary adjustment */ |
| 238 |
while (sp < nsp) { |
| 239 |
alen = len/(nsp-sp); |
| 240 |
*sp++ += alen; |
| 241 |
len -= alen; |
| 242 |
} |
| 243 |
tp = tab; |
| 244 |
} |
| 245 |
return(width); |
| 246 |
} |
