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#include <daguerre/psf.hpp>
namespace daguerre {
//TODO: this assumes the font is in psf2 format, and has a unicode table
std::optional<fixed_font<bool>> try_load_psf(FILE *input) {
uint32_t header[8];
if (fread(header, 4, 8, input) != 8)
return {};
const uint32_t glyphs_start = header[2];
const uint32_t glyph_count = header[4];
const uint32_t glyph_length = header[5];
const uint32_t height = header[6];
const uint32_t width = header[7];
fixed_font<bool> font(width, height);
const uint32_t unicode_start = glyphs_start + glyph_count * glyph_length;
fseek(input, unicode_start, SEEK_SET);
uint32_t indices[128];
for (uint32_t index = 0; index < glyph_count; ++index) {
uint8_t ch;
fread(&ch, 1, 1, input);
if (ch < 128)
indices[ch] = index;
do
if (fread(&ch, 1, 1, input) != 1)
return {};
while (ch != 0xff);
}
for (uint8_t ch = 0; ch < 128; ++ch) {
fseek(input, glyphs_start + glyph_length * indices[ch], SEEK_SET);
for (unsigned h = 0; h < height; ++h)
for (unsigned wb = 0; wb < width; wb += 8) {
uint8_t byte;
fread(&byte, 1, 1, input);
for (unsigned x = 0; x < 8 && wb + x < width; ++x)
font.glyphs[ch].at(wb + x, h) = (byte >> (7 - x)) & 1;
}
}
return font;
}
}
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