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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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GPG key ID: B5690EEEBB952194
19 changed files with 71 additions and 54 deletions
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9
components/constellation/constellation_webview.rs
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@ -2,11 +2,10 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::collections::HashMap;
use base::id::{BrowsingContextId, PipelineId};
use embedder_traits::{InputEvent, MouseLeftViewportEvent, Theme};
use euclid::Point2D;
use fnv::FnvHashMap;
use log::warn;
use script_traits::{ConstellationInputEvent, ScriptThreadMessage};
use style_traits::CSSPixel;
@ -64,7 +63,7 @@ impl ConstellationWebView {
fn target_pipeline_id_for_input_event(
&self,
event: &ConstellationInputEvent,
browsing_contexts: &HashMap<BrowsingContextId, BrowsingContext>,
browsing_contexts: &FnvHashMap<BrowsingContextId, BrowsingContext>,
) -> Option<PipelineId> {
if let Some(hit_test_result) = &event.hit_test_result {
return Some(hit_test_result.pipeline_id);
@ -85,8 +84,8 @@ impl ConstellationWebView {
pub(crate) fn forward_input_event(
&mut self,
event: ConstellationInputEvent,
pipelines: &HashMap<PipelineId, Pipeline>,
browsing_contexts: &HashMap<BrowsingContextId, BrowsingContext>,
pipelines: &FnvHashMap<PipelineId, Pipeline>,
browsing_contexts: &FnvHashMap<BrowsingContextId, BrowsingContext>,
) {
let Some(pipeline_id) = self.target_pipeline_id_for_input_event(&event, browsing_contexts)
else {