forked from AbleOS/ableos
75 lines
1.3 KiB
Plaintext
75 lines
1.3 KiB
Plaintext
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.{log} := @use("../../stn/src/lib.hb")
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PSF1Header := packed struct {
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magic: u16,
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font_mode: u8,
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character_size: u8,
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}
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PSF2Header := packed struct {
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magic: u32,
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version: u32,
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header_size: u32,
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flags: u32,
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num_glyph: u32,
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bytes_per_glyph: u32,
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height: u32,
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width: u32,
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}
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Font := struct {
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data: ^u8,
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width: uint,
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height: uint,
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num_glyphs: uint,
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bytes_per_glyph: uint,
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has_unicode_table: bool,
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line_gap: uint,
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char_gap: uint,
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}
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font_from_psf1 := fn(psf: ^u8): Font {
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header := @as(^PSF1Header, @bitcast(psf))
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if header.magic != 0x436 {
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log.error("failed to load psf font: not a psf1 font, idiot\0")
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return idk
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}
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psf += @sizeof(PSF1Header)
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return .(
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psf,
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8,
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@intcast(header.character_size),
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256,
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@intcast(header.character_size),
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false,
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0,
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0,
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)
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}
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font_from_psf2 := fn(psf: ^u8): Font {
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header := @as(^PSF2Header, @bitcast(psf))
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if header.magic != 0x864AB572 {
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log.error("failed to load psf font: not a psf2 font, idiot\0")
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return idk
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}
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psf += header.header_size
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return .(
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psf,
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@intcast(header.width),
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@intcast(header.height),
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@intcast(header.num_glyph),
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@intcast(header.bytes_per_glyph),
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(header.flags & 1) != 0,
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0,
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0,
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)
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}
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get_glyph := fn(font: Font, index: uint): ^u8 {
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return font.data + index * font.bytes_per_glyph
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}
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