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// MIT License, Copyright (c) 2020 Marvin Borner
// PSF parser
#include <assert.h>
#include <def.h>
#include <libgui/gfx.h>
#include <libgui/psf.h>
#include <mem.h>
#include <print.h>
static u8 psf_verify(void *data)
{
struct psf1_header *header1 = (struct psf1_header *)data;
struct psf2_header *header2 = (struct psf2_header *)data;
if (header1->magic == PSF1_MAGIC)
return 1;
else if (header2->magic == PSF2_MAGIC)
return 2;
else
return 0;
}
void psf_free(struct gfx_font *font)
{
free(font->raw);
free(font);
}
// TODO: Improve bruteforce unitab search
u32 psf_unicode(struct gfx_font *font, u32 needle)
{
if (!font->flags.unicode)
return 0;
u8 *data = font->raw;
u8 version = psf_verify(data);
assert(version == 2);
struct psf2_header *header = (struct psf2_header *)data;
u8 *table = (u8 *)(data + header->size + header->char_count * header->char_size);
u32 glyph = 0;
while (table < data + font->total_size) {
u32 ch = table[0] & 0xff;
if (ch == 0xff) {
glyph++;
table++;
continue;
} else if (ch & 128) {
if ((ch & 32) == 0) {
ch = ((table[0] & 0x1f) << 6) + (table[1] & 0x3f);
table++;
} else if ((ch & 16) == 0) {
ch = ((((table[0] & 0xf) << 6) + (table[1] & 0x3f)) << 6) +
(table[2] & 0x3f);
table += 2;
} else if ((ch & 8) == 0) {
ch = ((((((table[0] & 0x7) << 6) + (table[1] & 0x3f)) << 6) +
(table[2] & 0x3f))
<< 6) +
(table[3] & 0x3f);
table += 3;
} else {
ch = 0;
}
}
if (ch == needle)
return glyph;
table++;
}
return 0;
}
struct gfx_font *psf_parse(const char *path)
{
struct stat s = { 0 };
if (stat(path, &s) != 0 || !s.size)
return NULL;
u8 *data = malloc(s.size);
read(path, data, 0, s.size);
u8 version = psf_verify(data);
if (version == 0) {
print("Unknown font!\n");
return NULL;
} else if (version == 1) {
log("PSF version 1 is no longer supported\n");
return NULL;
}
struct psf2_header *header = (struct psf2_header *)data;
u8 *chars = data + header->size;
u32 height = header->height;
u32 width = header->width;
u32 char_size = header->char_size;
if (!(header->flags & PSF2_UNICODE))
log("No unicode table found, fonts may not render correctly!\n");
struct gfx_font *font = malloc(sizeof(*font));
font->raw = data;
font->chars = chars;
font->size.x = width;
font->size.y = height;
font->char_size = char_size;
font->total_size = s.size;
font->flags.unicode = (header->flags & PSF2_UNICODE) == PSF2_UNICODE;
return font;
}
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