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Update pixels::unmultiply_inplace to support RB swap and use it in canvas_state (#35313)

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* update unmultiply_inplace to handle reversed RGB

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

* Reuse unmultiply_inplace instead of manual compute; remove unused

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

---------

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>
This commit is contained in:
Euclid Ye 2025-02-06 13:02:49 +08:00 • committed by GitHub
parent cb7688314b
commit 0de6d1bc3a
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6 changed files with 13 additions and 4116 deletions
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8
components/script/canvas_state.rs
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@ -58,7 +58,6 @@ use crate::dom::offscreencanvas::{OffscreenCanvas, OffscreenCanvasContext};
use crate::dom::paintworkletglobalscope::PaintWorkletGlobalScope;
use crate::dom::textmetrics::TextMetrics;
use crate::script_runtime::CanGc;
use crate::unpremultiplytable::UNPREMULTIPLY_TABLE;
#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
#[derive(Clone, JSTraceable, MallocSizeOf)]
@ -320,12 +319,7 @@ impl CanvasState {
self.send_canvas_2d_msg(Canvas2dMsg::GetImageData(rect, canvas_size, sender));
let mut pixels = receiver.recv().unwrap().to_vec();
for chunk in pixels.chunks_mut(4) {
let b = chunk[0];
chunk[0] = UNPREMULTIPLY_TABLE[256 * (chunk[3] as usize) + chunk[2] as usize];
chunk[1] = UNPREMULTIPLY_TABLE[256 * (chunk[3] as usize) + chunk[1] as usize];
chunk[2] = UNPREMULTIPLY_TABLE[256 * (chunk[3] as usize) + b as usize];
}
pixels::unmultiply_inplace::<true>(&mut pixels);
pixels
}