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webgl: Add support for premultiplying alpha.

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Now the affected testcase only fails due to unpack alignment.
This commit is contained in:
Eric Anholt 2017-01-08 21:34:41 -08:00
parent 57ba1646bc
commit dfc4de0d84
3 changed files with 103 additions and 866 deletions
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10
components/canvas_traits/lib.rs
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@ -417,6 +417,10 @@ pub fn byte_swap(data: &mut [u8]) {
}
}
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();
@ -427,9 +431,9 @@ pub fn byte_swap_and_premultiply(data: &mut [u8]) {
let b = data[i + 0];
let a = data[i + 3];
data[i + 0] = ((r as u32) * (a as u32) / 255) as u8;
data[i + 1] = ((g as u32) * (a as u32) / 255) as u8;
data[i + 2] = ((b as u32) * (a as u32) / 255) as u8;
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;
}