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make diff/luma calc prettier

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YK 2024-07-05 16:54:06 +03:00
parent 470273d387
commit 5b6c75de6a
1 changed files with 6 additions and 7 deletions
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13
src/decoder.rs
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@ -65,17 +65,16 @@ impl Decoder for Vec<[u8; 4]> {
(known[q as usize & 63], 1) (known[q as usize & 63], 1)
}, },
q if q >> 6 == 1 => { // QOI_OP_DIFF q if q >> 6 == 1 => { // QOI_OP_DIFF
let dr = ((q & 48) >> 4) as i8 - 2; let mut diff = [((q & 48) >> 4) as i8 - 2, ((q & 12) >> 2) as i8 - 2, (q & 3) as i8 - 2, 0].into_iter();
let dg = ((q & 12) >> 2) as i8 - 2; (prev.map(|p| p.wrapping_add_signed(diff.next().unwrap())), 1)
let db = (q & 3) as i8 - 2;
([ prev[0].wrapping_add_signed(dr), prev[1].wrapping_add_signed(dg), prev[2].wrapping_add_signed(db), prev[3]], 1)
}, },
q if q >> 6 == 2 => { // QOI_OP_LUMA q if q >> 6 == 2 => { // QOI_OP_LUMA
let extra = *iter.next()?; let extra = *iter.next()?;
let dg = (q & 63) as i8 - 32; let dg = (q & 63) as i8 - 32;
let dr = ((extra & 240) >> 4) as i8 - 8; let dr = ((extra & 240) >> 4) as i8 - 8 + dg;
let db = (extra & 15) as i8 - 8; let db = (extra & 15) as i8 - 8 + dg;
([ prev[0].wrapping_add_signed(dr + dg), prev[1].wrapping_add_signed(dg), prev[2].wrapping_add_signed(db + dg), prev[3]], 1) let mut diff = [dr, dg, db, 0].into_iter();
(prev.map(|p| p.wrapping_add_signed(diff.next().unwrap())), 1)
}, },
q if q >> 6 == 3 => { // QOI_OP_RUN q if q >> 6 == 3 => { // QOI_OP_RUN
let len = ((q & 63) + 1) as usize; let len = ((q & 63) + 1) as usize;