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Optimized unmultiply_inplace to remove fp ops (#33582)

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Signed-off-by: Shalvin Deo <shalvin.deo@live.com>
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Shalvin 2024-09-30 21:39:27 +02:00 • committed by GitHub
parent 9864a02232
commit 022a95a2cd
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1 changed files with 14 additions and 4 deletions
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18
components/pixels/lib.rs
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@ -199,10 +199,20 @@ pub fn detect_image_format(buffer: &[u8]) -> Result<ImageFormat, &str> {
pub fn unmultiply_inplace(pixels: &mut [u8]) {
for rgba in pixels.chunks_mut(4) {
let a = (rgba[3] as f32) / 255.0;
rgba[0] = (rgba[0] as f32 / a) as u8;
rgba[1] = (rgba[1] as f32 / a) as u8;
rgba[2] = (rgba[2] as f32 / a) as u8;
let a = rgba[3] as u32;
let mut b = rgba[2] as u32;
let mut g = rgba[1] as u32;
let mut r = rgba[0] as u32;
if a > 0 {
r = r * 255 / a;
g = g * 255 / a;
b = b * 255 / a;
rgba[2] = b as u8;
rgba[1] = g as u8;
rgba[0] = r as u8;
}
}
}