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Removed FnvHash and transformed the rest to FxHashmap (#39233)

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This should be the final PR for the Hash Function series that is
trivial.

Of note: I decided to transform `HashMapTracedValues<Atom,..>` to use
FxBuildHasher. This is likely not going to improve performance as Atom's
already have a unique u32 that is used as the Hash but it safes a few
bytes for the RandomState that is normally in the HashMap.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>

Testing: Hash function changes should not change functionality, we
slightly decrease the size and unit tests still work.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>
This commit is contained in:
Narfinger 2025-09-10 15:34:54 +02:00 • committed by GitHub
parent 726b456120
commit 84465e7768
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55 changed files with 211 additions and 202 deletions
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12
components/net/image_cache.rs
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@ -487,12 +487,12 @@ struct ImageCacheStore {
/// Vector (e.g. SVG) images that have been sucessfully loaded and parsed
/// but are yet to be rasterized. Since the same SVG data can be used for
/// rasterizing at different sizes, we use this hasmap to share the data.
vector_images: HashMap<PendingImageId, VectorImageData>,
vector_images: FxHashMap<PendingImageId, VectorImageData>,
/// Vector images for which rasterization at a particular size has started
/// or completed. If completed, the `result` member of `RasterizationTask`
/// contains the rasterized image.
rasterized_vector_images: HashMap<(PendingImageId, DeviceIntSize), RasterizationTask>,
rasterized_vector_images: FxHashMap<(PendingImageId, DeviceIntSize), RasterizationTask>,
/// The placeholder image used when an image fails to load
#[conditional_malloc_size_of]
@ -722,8 +722,8 @@ impl ImageCache for ImageCacheImpl {
store: Arc::new(Mutex::new(ImageCacheStore {
pending_loads: AllPendingLoads::new(),
completed_loads: HashMap::new(),
vector_images: HashMap::new(),
rasterized_vector_images: HashMap::new(),
vector_images: FxHashMap::default(),
rasterized_vector_images: FxHashMap::default(),
placeholder_image: get_placeholder_image(&compositor_api, &rippy_data),
placeholder_url: ServoUrl::parse("chrome://resources/rippy.png").unwrap(),
compositor_api: compositor_api.clone(),
@ -1083,8 +1083,8 @@ impl ImageCache for ImageCacheImpl {
placeholder_image,
placeholder_url,
compositor_api,
vector_images: HashMap::new(),
rasterized_vector_images: HashMap::new(),
vector_images: FxHashMap::default(),
rasterized_vector_images: FxHashMap::default(),
key_cache: KeyCache::new(),
pipeline_id,
})),