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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <grass/gis.h>
struct glyph {
unsigned int offset : 20;
unsigned int count : 12;
};
static struct glyph *glyphs;
static int glyphs_alloc;
static unsigned char *xcoords, *ycoords;
static int coords_offset;
static int coords_alloc;
static int fontmap[1024];
static int num_chars;
static char current_font[16];
static int font_loaded;
static struct glyph *glyph_slot(int idx)
{
if (glyphs_alloc <= idx) {
int new_alloc = idx + ((glyphs_alloc > 0) ? 1000 : 4000);
glyphs = G_realloc(glyphs, new_alloc * sizeof(struct glyph));
memset(&glyphs[glyphs_alloc], 0,
(new_alloc - glyphs_alloc) * sizeof(struct glyph));
glyphs_alloc = new_alloc;
}
return &glyphs[idx];
}
static int coord_slots(int count)
{
int n;
if (coords_alloc < coords_offset + count) {
coords_alloc =
coords_offset + count + ((coords_alloc > 0) ? 10000 : 60000);
xcoords = G_realloc(xcoords, coords_alloc);
ycoords = G_realloc(ycoords, coords_alloc);
}
n = coords_offset;
coords_offset += count;
return n;
}
static void read_hersh(const char *filename)
{
FILE *fp = fopen(filename, "r");
if (!fp)
return;
while (!feof(fp)) {
char buf[8];
struct glyph *glyph;
int coords;
unsigned int i, idx, count;
int c;
switch (c = fgetc(fp)) {
case '\r':
fgetc(fp);
continue;
case '\n':
continue;
default:
ungetc(c, fp);
break;
}
if (fread(buf, 1, 5, fp) != 5)
break;
buf[5] = 0;
idx = atoi(buf);
if (fread(buf, 1, 3, fp) != 3)
break;
buf[3] = 0;
count = atoi(buf);
glyph = glyph_slot(idx);
coords = coord_slots(count);
glyph->offset = coords;
glyph->count = count;
for (i = 0; i < count; i++) {
if ((i + 4) % 36 == 0) {
/* skip newlines? */
if (fgetc(fp) == '\r')
fgetc(fp);
}
xcoords[coords + i] = fgetc(fp);
ycoords[coords + i] = fgetc(fp);
}
if (fgetc(fp) == '\r')
fgetc(fp);
}
fclose(fp);
}
static void load_glyphs(void)
{
int i;
if (glyphs)
return;
for (i = 1; i <= 4; i++) {
char buf[GPATH_MAX];
sprintf(buf, "%s/fonts/hersh.oc%d", G_gisbase(), i);
read_hersh(buf);
}
}
static void read_fontmap(const char *name)
{
char buf[GPATH_MAX];
FILE *fp;
num_chars = 0;
memset(fontmap, 0, sizeof(fontmap));
sprintf(buf, "%s/fonts/%s.hmp", G_gisbase(), name);
fp = fopen(buf, "r");
if (!fp) {
G_warning("Unable to open font map '%s': %s. "
"Try running 'g.mkfontcap --overwrite'",
buf, strerror(errno));
return;
}
while (fscanf(fp, "%s", buf) == 1) {
int a, b;
if (sscanf(buf, "%d-%d", &a, &b) == 2)
while (a <= b)
fontmap[num_chars++] = a++;
else if (sscanf(buf, "%d", &a) == 1)
fontmap[num_chars++] = a;
}
fclose(fp);
}
static void load_font(void)
{
if (font_loaded)
return;
if (!glyphs)
load_glyphs();
read_fontmap(current_font);
font_loaded = 1;
}
int font_init(const char *name)
{
if (strcmp(name, current_font) == 0)
return 0;
strcpy(current_font, name);
font_loaded = 0;
return 0;
}
int get_char_vects(unsigned char achar, int *n, unsigned char **X,
unsigned char **Y)
{
struct glyph *glyph;
int i;
if (!font_loaded)
load_font();
i = (int)achar - 040; /* translate achar to char# in font index */
if (i <= 0 || i >= num_chars) {
*n = 0;
return 1;
}
glyph = &glyphs[fontmap[i]];
*n = glyph->count;
*X = &xcoords[glyph->offset];
*Y = &ycoords[glyph->offset];
return 0;
}
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