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perf(hash): swap std HashMap/HashSet for rustc-hash FxHash

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Phase 4.1. Handle / u64 keys dominate the hot maps (block_defn,
hatch / image / mesh caches, draw-depth map, viewport wire caches);
the default SipHash is wasted work on integer keys. Alias the std
types to rustc_hash::FxHashMap / FxHashSet crate-wide so every map and
set — including the cross-module draw-depth map shared between scene
and the GPU pipelines — uses the faster hasher consistently.

Mechanical: no behavioural change. Constructors moved from ::new() to
::default() (Fx variants carry no RandomState). Build + 13 tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-05 00:35:53 +03:00
commit 70702d063f
30 changed files with 102 additions and 98 deletions
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14
src/scene/lff.rs
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@ -16,7 +16,7 @@
// Cap height is 9 glyph units, matching the `height / 9.0` text scale used
// throughout the renderer.
use std::collections::{HashMap, HashSet};
use rustc_hash::{FxHashMap as HashMap, FxHashSet as HashSet};
use std::sync::{Mutex, OnceLock};
// ── Embedded fonts ─────────────────────────────────────────────────────────
@ -154,7 +154,7 @@ fn warn_missing_glyph(font_name: &str, ch: char) {
if ch.is_ascii() {
return;
}
let set = WARNED_GLYPHS.get_or_init(|| Mutex::new(HashSet::new()));
let set = WARNED_GLYPHS.get_or_init(|| Mutex::new(HashSet::default()));
if let Ok(mut guard) = set.lock() {
if guard.insert((font_name.to_string(), ch)) {
eprintln!(
@ -167,7 +167,7 @@ fn warn_missing_glyph(font_name: &str, ch: char) {
fn fonts_map() -> &'static HashMap<String, Font> {
FONTS.get_or_init(|| {
let mut map = HashMap::new();
let mut map = HashMap::default();
// Register every font under its stem and its `# Name:` header.
for (stem, src) in FONTS_SRC {
let f = parse_lff(src);
@ -461,12 +461,12 @@ fn parse_lff(src: &str) -> Font {
letter_spacing: 3.0,
word_spacing: 6.75,
line_spacing: 1.0,
glyphs: HashMap::new(),
shapes: HashMap::new(),
glyphs: HashMap::default(),
shapes: HashMap::default(),
};
let mut raw: HashMap<char, RawGlyph> = HashMap::new();
let mut raw_shapes: HashMap<String, RawGlyph> = HashMap::new();
let mut raw: HashMap<char, RawGlyph> = HashMap::default();
let mut raw_shapes: HashMap<String, RawGlyph> = HashMap::default();
let mut cur: Option<char> = None;
let mut cur_name: Option<String> = None;
let mut cur_glyph = RawGlyph::default();