ref: 7936220f7971f2a34be3a215750626f5e82f2353
dir: /font.c/
/* font handling */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "roff.h"
/* look up a character in chead[]/cnext[] table */
static int font_cidx(struct font *fn, char *name)
{
int i = fn->chead[(unsigned char) name[0]];
while (i >= 0 && strcmp(name, fn->c[i]))
i = fn->cnext[i];
return i;
}
/* look up a character in ghead[]/gnext[] table */
static int font_gidx(struct font *fn, char *id)
{
int i = fn->ghead[(unsigned char) id[0]];
while (i >= 0 && strcmp(fn->glyphs[i].id, id))
i = fn->gnext[i];
return i;
}
struct glyph *font_find(struct font *fn, char *name)
{
int i = font_cidx(fn, name);
if (i < 0)
return NULL;
return fn->g_map[i] ? fn->g_map[i] : fn->g[i];
}
struct glyph *font_glyph(struct font *fn, char *id)
{
int i = font_gidx(fn, id);
return i >= 0 ? &fn->glyphs[i] : NULL;
}
static struct glyph *font_glyphput(struct font *fn, char *id, char *name, int type)
{
int i = fn->nglyphs++;
struct glyph *g;
g = &fn->glyphs[i];
strcpy(g->id, id);
strcpy(g->name, name);
g->type = type;
g->font = fn;
fn->gnext[i] = fn->ghead[(unsigned char) id[0]];
fn->ghead[(unsigned char) id[0]] = i;
return g;
}
/* map character name to the given glyph */
int font_map(struct font *fn, char *name, struct glyph *g)
{
int i = font_cidx(fn, name);
if (g && g->font != fn)
return 1;
if (i < 0) {
if (fn->n >= NGLYPHS)
return 1;
i = fn->n++;
strcpy(fn->c[i], name);
fn->cnext[i] = fn->chead[(unsigned char) name[0]];
fn->chead[(unsigned char) name[0]] = i;
}
fn->g_map[i] = g;
return 0;
}
/* return nonzero if character name has been mapped with font_map() */
int font_mapped(struct font *fn, char *name)
{
int i = font_cidx(fn, name);
return i >= 0 && fn->g_map[i];
}
/* glyph index in fn->glyphs[] */
static int font_idx(struct font *fn, struct glyph *g)
{
return g ? g - fn->glyphs : -1;
}
/*
* Given a list of characters in the reverse order, font_lig()
* returns the number of characters from the beginning of this
* list that form a ligature in this font. Zero naturally means
* no ligature was matched.
*/
int font_lig(struct font *fn, char **c, int n)
{
int i;
/* concatenated characters in c[], in the correct order */
char s[GNLEN * 2] = "";
/* b[i] is the number of character of c[] in s + i */
int b[GNLEN * 2] = {0};
int len = 0;
for (i = 0; i < n; i++) {
char *cur = c[n - i - 1];
b[len] = n - i;
strcpy(s + len, cur);
len += strlen(cur);
}
for (i = 0; i < fn->lgn; i++) {
int l = strlen(fn->lg[i]);
if (b[len - l] > 1 && !strcmp(s + len - l, fn->lg[i]))
if (font_find(fn, fn->lg[i]))
return b[len - l];
}
return 0;
}
/* return nonzero if s is a ligature */
int font_islig(struct font *fn, char *s)
{
int i;
for (i = 0; i < fn->lgn; i++)
if (!strcmp(s, fn->lg[i]))
return 1;
return 0;
}
/* return pairwise kerning value between c1 and c2 */
int font_kern(struct font *fn, char *c1, char *c2)
{
int i1, i2, i;
i1 = font_idx(fn, font_find(fn, c1));
i2 = font_idx(fn, font_find(fn, c2));
if (i1 < 0 || i2 < 0)
return 0;
i = fn->knhead[i1];
while (i >= 0) {
if (fn->knpair[i] == i2)
return fn->knval[i];
i = fn->knnext[i];
}
return 0;
}
static int font_readchar(struct font *fn, FILE *fin)
{
char tok[ILNLEN];
char name[ILNLEN];
char id[ILNLEN];
struct glyph *glyph = NULL;
int type;
if (fn->n >= NGLYPHS)
return 1;
if (fscanf(fin, "%s %s", name, tok) != 2)
return 1;
if (!strcmp("---", name))
sprintf(name, "c%04d", fn->n);
if (!strcmp("\"", tok)) {
glyph = fn->g[fn->n - 1];
} else {
if (fscanf(fin, "%d %s", &type, id) != 2)
return 1;
glyph = font_glyph(fn, id);
if (!glyph) {
glyph = font_glyphput(fn, id, name, type);
sscanf(tok, "%d,%d,%d,%d,%d", &glyph->wid,
&glyph->llx, &glyph->lly, &glyph->urx, &glyph->ury);
}
}
strcpy(fn->c[fn->n], name);
fn->g[fn->n] = glyph;
fn->cnext[fn->n] = fn->chead[(unsigned char) name[0]];
fn->chead[(unsigned char) name[0]] = fn->n;
fn->n++;
return 0;
}
static int font_readkern(struct font *fn, FILE *fin)
{
char c1[ILNLEN], c2[ILNLEN];
int i1, i2, val;
if (fscanf(fin, "%s %s %d", c1, c2, &val) != 3)
return 1;
i1 = font_idx(fn, font_glyph(fn, c1));
i2 = font_idx(fn, font_glyph(fn, c2));
if (fn->knn < NKERNS && i1 >= 0 && i2 >= 0) {
fn->knnext[fn->knn] = fn->knhead[i1];
fn->knhead[i1] = fn->knn;
fn->knval[fn->knn] = val;
fn->knpair[fn->knn] = i2;
fn->knn++;
}
return 0;
}
static void skipline(FILE* filp)
{
int c;
do {
c = getc(filp);
} while (c != '\n' && c != EOF);
}
struct font *font_open(char *path)
{
struct font *fn;
char tok[ILNLEN];
FILE *fin;
int i;
fin = fopen(path, "r");
if (!fin)
return NULL;
fn = malloc(sizeof(*fn));
if (!fn) {
fclose(fin);
return NULL;
}
memset(fn, 0, sizeof(*fn));
for (i = 0; i < LEN(fn->ghead); i++)
fn->ghead[i] = -1;
for (i = 0; i < LEN(fn->chead); i++)
fn->chead[i] = -1;
for (i = 0; i < LEN(fn->knhead); i++)
fn->knhead[i] = -1;
while (fscanf(fin, "%s", tok) == 1) {
if (!strcmp("char", tok)) {
font_readchar(fn, fin);
} else if (!strcmp("kern", tok)) {
font_readkern(fn, fin);
} else if (!strcmp("spacewidth", tok)) {
fscanf(fin, "%d", &fn->spacewid);
} else if (!strcmp("special", tok)) {
fn->special = 1;
} else if (!strcmp("name", tok)) {
fscanf(fin, "%s", fn->name);
} else if (!strcmp("fontname", tok)) {
fscanf(fin, "%s", fn->fontname);
} else if (!strcmp("ligatures", tok)) {
while (fscanf(fin, "%s", tok) == 1) {
if (!strcmp("0", tok))
break;
if (fn->lgn < NLIGS)
strcpy(fn->lg[fn->lgn++], tok);
}
} else if (!strcmp("charset", tok)) {
while (!font_readchar(fn, fin))
;
break;
}
skipline(fin);
}
fclose(fin);
return fn;
}
void font_close(struct font *fn)
{
free(fn);
}