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image-copy: Use damage_output() for additional damage

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The important change here is that we now apply the additional damage
first, instead of using `.extend()` to add it after other elements. This
is important since `OutputDamageTracker` will ignore our damage elements
if there are behind an element with an opaque region.

This also makes things a bit simpler, especially `take_screencopy_frames()`,
which no longer needs a mutable references to extend then truncate.

The implementation of `OutputDamageTracker` isn't entirely clear, but as
far as I can tell this is intended to work, and it seems to work in some
testing.
This commit is contained in:
Ian Douglas Scott 2025-09-17 11:06:02 -07:00 • committed by Victoria Brekenfeld
parent cac7a5aca6
commit 9bc1b6e1ee
4 changed files with 74 additions and 113 deletions
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44
src/backend/render/mod.rs
View file

@ -1393,21 +1393,20 @@ where
)?;
let old_len = elements.len();
elements.extend(
additional_damage
.into_iter()
.map(|rect| {
rect.to_f64()
.to_logical(
output.current_scale().fractional_scale(),
output.current_transform(),
&area,
)
.to_i32_round()
})
.map(DamageElement::new)
.map(Into::into),
);
let additional_damage_elements: Vec<_> = additional_damage
.into_iter()
.map(|rect| {
rect.to_f64()
.to_logical(
output.current_scale().fractional_scale(),
output.current_transform(),
&area,
)
.to_i32_round()
})
.map(DamageElement::new)
.collect();
dt.damage_output(age, &additional_damage_elements)?;
Some(old_len)
} else {
@ -1513,7 +1512,7 @@ where
CosmicMappedRenderElement<R>: RenderElement<R>,
WorkspaceRenderElement<R>: RenderElement<R>,
{
let mut elements: Vec<CosmicElement<R>> = workspace_elements(
let elements: Vec<CosmicElement<R>> = workspace_elements(
gpu,
renderer,
shell,
@ -1528,13 +1527,12 @@ where
if let Some(additional_damage) = additional_damage {
let output_geo = output.geometry().to_local(output).as_logical();
elements.extend(
additional_damage
.into_iter()
.filter_map(|rect| rect.intersection(output_geo))
.map(DamageElement::new)
.map(Into::<CosmicElement<R>>::into),
);
let additional_damage_elements: Vec<_> = additional_damage
.into_iter()
.filter_map(|rect| rect.intersection(output_geo))
.map(DamageElement::new)
.collect();
damage_tracker.damage_output(age, &additional_damage_elements)?;
}
let res = damage_tracker.render_output(