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#include "vterm.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct psf font;
void *font_data;
void font_load(const char *path) {
FILE *f = fopen(path, "r");
if (!f) {
eprintf("couldn't open font \"%s\"", path);
exit(1);
}
void *buf;
long buflen;
fseek(f, 0, SEEK_END);
buflen = ftell(f);
if (buflen < 0) {
eprintf("can't get the size of \"%s\"", path);
exit(1);
}
buf = malloc(buflen);
if (!buf) {
eprintf("out of memory");
exit(1);
}
fseek(f, 0, SEEK_SET);
fread(buf, 1, buflen, f);
if (ferror(f)) {
eprintf("error reading file");
exit(1);
}
fclose(f);
if (memcmp(buf, "\x72\xb5\x4a\x86", 4)) {
eprintf("invalid psf header");
exit(1);
}
memcpy(&font, buf, sizeof font);
font_data = buf + font.glyph_offset;
}
void font_blit(uint32_t glyph, int x, int y) {
if (glyph >= font.glyph_amt) glyph = 0;
dirty_mark(x, y);
char *bitmap = font_data + font.glyph_size * glyph;
for (size_t i = 0; i < font.w; i++) {
for (size_t j = 0; j < font.h; j++) {
size_t idx = j * font.w + i;
char byte = bitmap[idx / 8];
byte >>= (7-(idx&7));
byte &= 1;
*((uint32_t*)&fb.b[fb.pitch * (y * font.h + j) + 4 * (x * font.w + i)]) = byte * 0xB0B0B0;
}
}
}
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