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Merge some byte swap/premultiply functions in their own crate

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This commit is contained in:
Anthony Ramine 2018-10-06 00:40:48 +02:00
parent a2e3dd4e86
commit 784fbb2bc1
18 changed files with 85 additions and 96 deletions
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35
components/canvas_traits/canvas.rs
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@ -382,38 +382,3 @@ impl FromStr for CompositionOrBlending {
Err(())
}
}
// TODO(pcwalton): Speed up with SIMD, or better yet, find some way to not do this.
pub fn byte_swap(data: &mut [u8]) {
let length = data.len();
// FIXME(rust #27741): Range::step_by is not stable yet as of this writing.
let mut i = 0;
while i < length {
let r = data[i + 2];
data[i + 2] = data[i + 0];
data[i + 0] = r;
i += 4;
}
}
pub fn multiply_u8_pixel(a: u8, b: u8) -> u8 {
return (a as u32 * b as u32 / 255) as u8;
}
pub fn byte_swap_and_premultiply(data: &mut [u8]) {
let length = data.len();
let mut i = 0;
while i < length {
let r = data[i + 2];
let g = data[i + 1];
let b = data[i + 0];
let a = data[i + 3];
data[i + 0] = multiply_u8_pixel(r, a);
data[i + 1] = multiply_u8_pixel(g, a);
data[i + 2] = multiply_u8_pixel(b, a);
i += 4;
}
}