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Further encoder improvements

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This commit is contained in:
Ivan Smirnov 2021-12-31 14:36:20 +03:00
parent 637ac22a99
commit 2a764a1132
1 changed files with 15 additions and 11 deletions
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26
src/encode.rs
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@ -105,19 +105,23 @@ where
let vg_r = vr.wrapping_sub(vg);
let vg_b = vb.wrapping_sub(vg);
// TODO maybe add an outer check for vg_32
let (vr_2, vg_2, vb_2) =
(vr.wrapping_add(2), vg.wrapping_add(2), vb.wrapping_add(2));
if vr_2 | vg_2 | vb_2 | 3 == 3 {
buf = buf.push(QOI_OP_DIFF | vr_2 << 4 | vg_2 << 2 | vb_2);
} else {
let (vg_32, vg_r_8, vg_b_8) =
(vg.wrapping_add(32), vg_r.wrapping_add(8), vg_b.wrapping_add(8));
if vg_r_8 | vg_b_8 | 15 == 15 && vg_32 | 63 == 63 {
buf = buf.write([QOI_OP_LUMA | vg_32, vg_r_8 << 4 | vg_b_8]);
let vg_32 = vg.wrapping_add(32);
if vg_32 | 63 == 63 {
let (vr_2, vg_2, vb_2) =
(vr.wrapping_add(2), vg.wrapping_add(2), vb.wrapping_add(2));
if vr_2 | vg_2 | vb_2 | 3 == 3 {
buf = buf.push(QOI_OP_DIFF | vr_2 << 4 | vg_2 << 2 | vb_2);
} else {
buf = buf.write([QOI_OP_RGB, px.r(), px.g(), px.b()]);
let (vg_r_8, vg_b_8) = (vg_r.wrapping_add(8), vg_b.wrapping_add(8));
if vg_r_8 | vg_b_8 | 15 == 15 {
buf = buf.write([QOI_OP_LUMA | vg_32, vg_r_8 << 4 | vg_b_8]);
} else {
buf = buf.write([QOI_OP_RGB, px.r(), px.g(), px.b()]);
}
}
} else {
buf = buf.write([QOI_OP_RGB, px.r(), px.g(), px.b()]);
}
} else {
buf = buf.write([QOI_OP_RGBA, px.r(), px.g(), px.b(), px.a_or(0xff)]);