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Additional optimization to fluv32 decoding.

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Tiny change but with a nice speed bump.
This commit is contained in:
Nathan Vegdahl 2020-09-20 02:35:37 +09:00
parent f20567247d
commit 8dee53d1fc
1 changed files with 2 additions and 2 deletions
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4
sub_crates/trifloat/src/fluv32.rs
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@ -79,7 +79,7 @@ pub fn encode(xyz: (f32, f32, f32)) -> u32 {
fn encode_uv(xyz: (f32, f32, f32)) -> u32 { fn encode_uv(xyz: (f32, f32, f32)) -> u32 {
let s = xyz.0 + (15.0 * xyz.1) + (3.0 * xyz.2); let s = xyz.0 + (15.0 * xyz.1) + (3.0 * xyz.2);
let u = ((4.0 * UV_SCALE) * xyz.0 / s).max(0.0).min(255.0) as u32; let u = ((4.0 * UV_SCALE) * xyz.0 / s).max(0.0).min(255.0) as u32;
let v = ((9.0 * UV_SCALE) * xyz.1 / s).max(0.0).min(255.0) as u32; let v = ((9.0 * UV_SCALE) * xyz.1 / s).max(1.0).min(255.0) as u32;
(u << 8) | v (u << 8) | v
}; };
@ -117,7 +117,7 @@ pub fn decode(fluv32: u32) -> (f32, f32, f32) {
let l_exp = fluv32 >> 26; let l_exp = fluv32 >> 26;
let l_mant = (fluv32 >> 16) & 0x3ff; let l_mant = (fluv32 >> 16) & 0x3ff;
let u = ((fluv32 >> 8) & 0xff) as f32; // Range 0.0-255.0 let u = ((fluv32 >> 8) & 0xff) as f32; // Range 0.0-255.0
let v = (fluv32 & 0xff).max(1) as f32; // Range 0.0-255.0 let v = (fluv32 & 0xff) as f32; // Range 0.0-255.0
// Calculate y. // Calculate y.
let y = f32::from_bits(((l_exp + 127 - EXP_BIAS as u32) << 23) | (l_mant << 13)); let y = f32::from_bits(((l_exp + 127 - EXP_BIAS as u32) << 23) | (l_mant << 13));