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Use HashMap entry API in a cleaner way

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Careful use of the right `VacantEntry` and `OccupiedEntry` methods makes
this possible without hacks or lifetime errors.
This commit is contained in:
Ian Douglas Scott 2024-12-23 16:05:28 -08:00 • committed by Victoria Brekenfeld
parent 32f9ff3cac
commit 3f5c64f50f
1 changed files with 6 additions and 9 deletions
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15
src/backend/kms/surface/mod.rs
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@ -75,7 +75,7 @@ use tracing::{error, trace, warn};
use std::{
borrow::BorrowMut,
collections::{HashMap, HashSet},
collections::{hash_map, HashMap, HashSet},
mem,
sync::{
atomic::{AtomicBool, Ordering},
@ -1060,18 +1060,15 @@ impl SurfaceThreadState {
}) || mirrored_output.current_scale().fractional_scale()
!= self.output.current_scale().fractional_scale()
}) {
let mirroring_state = {
let entry = self.mirroring_textures.entry(self.target_node);
let mut new_state = None;
if matches!(entry, std::collections::hash_map::Entry::Vacant(_)) {
new_state = Some(MirroringState::new_with_renderer(
let mirroring_state = match self.mirroring_textures.entry(self.target_node) {
hash_map::Entry::Occupied(occupied) => occupied.into_mut(),
hash_map::Entry::Vacant(vacant) => {
vacant.insert(MirroringState::new_with_renderer(
&mut renderer,
compositor.format(),
mirrored_output,
)?);
)?)
}
// I really want a failable initializer...
entry.or_insert_with(|| new_state.unwrap())
};
mirroring_state