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svg_img: Fix the conversion error of the SVG fill color with alpha (#410)

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### Before
<img width="156" alt="image"
src="https://github.com/user-attachments/assets/c7177ac7-58aa-4865-81c9-4f7ddff9f145">

### After
<img width="176" alt="image"
src="https://github.com/user-attachments/assets/a010e78d-752e-4298-bf40-7a42b916e547">
This commit is contained in:
Floyd Wang 2024-11-12 19:26:24 +08:00
parent e478d5606f
commit e77578a53f
1 changed files with 7 additions and 1 deletions
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8
crates/ui/src/svg_img.rs
View file

@ -131,9 +131,15 @@ impl Asset for Image {
let mut buffer = ImageBuffer::from_raw(pixmap.width(), pixmap.height(), pixmap.take())
.expect("invalid svg image buffer");
// Convert from RGBA to BGRA.
// Convert from RGBA with premultiplied alpha to BGRA with straight alpha.
for pixel in buffer.chunks_exact_mut(4) {
pixel.swap(0, 2);
if pixel[3] > 0 {
let a = pixel[3] as f32 / 255.;
pixel[0] = (pixel[0] as f32 / a) as u8;
pixel[1] = (pixel[1] as f32 / a) as u8;
pixel[2] = (pixel[2] as f32 / a) as u8;
}
}
Ok(Arc::new(RenderImage::new(SmallVec::from_elem(