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On Wayland, pre-multiply alpha for custom cursor

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Fixes: #3360
This commit is contained in:
Kirill Chibisov 2024-01-30 18:03:21 +04:00
parent dd13ccda4c
commit 21df84b7f4
3 changed files with 11 additions and 7 deletions
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15
src/platform_impl/linux/wayland/types/cursor.rs
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@ -37,12 +37,15 @@ impl CustomCursor {
)
.unwrap();
for (canvas_chunk, rgba_chunk) in canvas.chunks_exact_mut(4).zip(image.rgba.chunks_exact(4))
{
canvas_chunk[0] = rgba_chunk[2];
canvas_chunk[1] = rgba_chunk[1];
canvas_chunk[2] = rgba_chunk[0];
canvas_chunk[3] = rgba_chunk[3];
for (canvas_chunk, rgba) in canvas.chunks_exact_mut(4).zip(image.rgba.chunks_exact(4)) {
// Alpha in buffer is premultiplied.
let alpha = rgba[3] as f32 / 255.;
let r = (rgba[0] as f32 * alpha) as u32;
let g = (rgba[1] as f32 * alpha) as u32;
let b = (rgba[2] as f32 * alpha) as u32;
let color = ((rgba[3] as u32) << 24) + (r << 16) + (g << 8) + b;
let array: &mut [u8; 4] = canvas_chunk.try_into().unwrap();
*array = color.to_le_bytes();
}
CustomCursor {