From 3e281d1828701a4a85036a60f7fb28c7755335da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?H=C3=A9ctor=20Ram=C3=B3n?= <hector@hecrj.dev>
Date: Sat, 30 Mar 2024 02:17:39 +0100
Subject: [PATCH] Use `rustc-hash` for `HashSet` of `glyphs_in_use` (#90)

---
 Cargo.toml        |  3 ++-
 src/text_atlas.rs | 16 +++++++++++-----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index e79ac24..d421ca9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,8 @@ license = "MIT OR Apache-2.0 OR Zlib"
 wgpu = { version = "0.19", default-features = false, features = ["wgsl"] }
 etagere = "0.2.10"
 cosmic-text = "0.11"
-lru = "0.12.1"
+lru = { version = "0.12.1", default-features = false }
+rustc-hash = "1.1"
 
 [dev-dependencies]
 winit = { version = "0.29.10", features = ["rwh_05"] }
diff --git a/src/text_atlas.rs b/src/text_atlas.rs
index 44e017c..c1bc0a8 100644
--- a/src/text_atlas.rs
+++ b/src/text_atlas.rs
@@ -4,7 +4,11 @@ use crate::{
 };
 use etagere::{size2, Allocation, BucketedAtlasAllocator};
 use lru::LruCache;
-use std::{borrow::Cow, collections::HashSet, mem::size_of, num::NonZeroU64, sync::Arc};
+use rustc_hash::FxHasher;
+use std::{
+    borrow::Cow, collections::HashSet, hash::BuildHasherDefault, mem::size_of, num::NonZeroU64,
+    sync::Arc,
+};
 use wgpu::{
     BindGroup, BindGroupDescriptor, BindGroupEntry, BindGroupLayout, BindGroupLayoutEntry,
     BindingResource, BindingType, BlendState, BufferBindingType, ColorTargetState, ColorWrites,
@@ -17,6 +21,8 @@ use wgpu::{
     VertexState,
 };
 
+type Hasher = BuildHasherDefault<FxHasher>;
+
 #[allow(dead_code)]
 pub(crate) struct InnerAtlas {
     pub kind: Kind,
@@ -24,8 +30,8 @@ pub(crate) struct InnerAtlas {
     pub texture_view: TextureView,
     pub packer: BucketedAtlasAllocator,
     pub size: u32,
-    pub glyph_cache: LruCache<CacheKey, GlyphDetails>,
-    pub glyphs_in_use: HashSet<CacheKey>,
+    pub glyph_cache: LruCache<CacheKey, GlyphDetails, Hasher>,
+    pub glyphs_in_use: HashSet<CacheKey, Hasher>,
     pub max_texture_dimension_2d: u32,
 }
 
@@ -56,8 +62,8 @@ impl InnerAtlas {
 
         let texture_view = texture.create_view(&TextureViewDescriptor::default());
 
-        let glyph_cache = LruCache::unbounded();
-        let glyphs_in_use = HashSet::new();
+        let glyph_cache = LruCache::unbounded_with_hasher(Hasher::default());
+        let glyphs_in_use = HashSet::with_hasher(Hasher::default());
 
         Self {
             kind,