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Switch the Color struct back to storing unassociated alpha (#4518)

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* Switch Color struct back to storing unassociated alpha

* Address review feedback

* Update the Invert node and legacy image migration for straight alpha and add round-trip tests

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>
This commit is contained in:
Dennis Kobert
2026-09-12 08:22:54 +00:00
committed by GitHub
parent e725f55043
commit 944d00cac5
13 changed files with 103 additions and 139 deletions
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9
node-graph/nodes/gstd/src/platform_application_io.rs
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@@ -171,14 +171,7 @@ fn decode_image(_: impl Ctx, data: Item<Resource>) -> Item<Raster<CPU>> {
};
let image = image.to_rgba32f();
let image = Image {
data: image
.chunks(4)
.map(|pixel| {
// Decoded bytes are unassociated gamma sRGB; premultiply in gamma then lift to linear
let a = pixel[3];
Color::from_gamma_srgb_channels(pixel[0] * a, pixel[1] * a, pixel[2] * a, a)
})
.collect(),
data: image.chunks(4).map(|pixel| Color::from_gamma_srgb_channels(pixel[0], pixel[1], pixel[2], pixel[3])).collect(),
width: image.width(),
height: image.height(),
..Default::default()