43 lines
877 B
Rust
43 lines
877 B
Rust
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//! QuickDraw PICT color lookup tables.
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use crate::{err::*, image::*};
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/// Read a `ColorTable` structure.
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pub fn read(b: &[u8]) -> ResultS<(Vec<Color8>, usize)>
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{
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read_data! {
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endian: BIG, buf: b, size: 8, start: 0, data {
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let dev = u16[4];
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let num = u16[6] usize;
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}
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}
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let dev = dev & 0x8000 != 0;
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let num = num + 1;
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let mut p = 8;
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let mut clut = vec![Color8::new(0, 0, 0); num];
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for i in 0..num {
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read_data! {
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endian: BIG, buf: b, size: 8, start: p, data {
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let n = u16[0] usize;
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let r = u8[2];
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let g = u8[4];
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let b = u8[6];
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}
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}
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// with device mapping, we ignore the index entirely
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let n = if dev {i} else {n};
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*ok!(clut.get_mut(n), "invalid index")? = Color8::new(r, g, b);
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p += 8;
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}
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Ok((clut, p))
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}
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// EOF
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