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constellation: Use FnvHashMap for hashmaps that use ids as keys (#39106)

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FNV is faster for hashing less than 16 bytes of data and the
cryptographic properties of the default HashMap are not needed for the
various ids.

Testing: This does not change functionality.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>
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Narfinger 2025-09-03 20:15:19 +02:00 • committed by GitHub
parent 0ae9ee28d5
commit 5c7ea4bdee
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19 changed files with 71 additions and 54 deletions
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3
components/compositing/compositor.rs
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@ -28,6 +28,7 @@ use crossbeam_channel::Sender;
use dpi::PhysicalSize;
use embedder_traits::{CompositorHitTestResult, InputEvent, ShutdownState, ViewportDetails};
use euclid::{Point2D, Rect, Scale, Size2D, Transform3D};
use fnv::FnvHashMap;
use ipc_channel::ipc::{self, IpcSharedMemory};
use log::{debug, info, trace, warn};
use pixels::{CorsStatus, ImageFrame, ImageMetadata, PixelFormat, RasterImage};
@ -1183,7 +1184,7 @@ impl IOCompositor {
// complete (i.e. has *all* layers painted to the requested epoch).
// This gets sent to the constellation for comparison with the current
// frame tree.
let mut pipeline_epochs = HashMap::new();
let mut pipeline_epochs = FnvHashMap::default();
for id in self
.webview_renderers
.iter()