RealtaNuaandClaude Opus 5.5 e37e0bc20b perf(render): keep glass shapes a later render asks for again ...

A glass layer's coverage, distance field and normals depend only on its
outline and the zoom. A shape asked for again in a later render (the
next frame of a drag, a slider drag, a canvas patch, an export of the
same view) is now worked out whole, in its own pixel frame (translation
reduced to its fraction, in 1/65536 px with carry), and kept: renders
reuse it instead of redoing the distance transform and normals for
their crop.

A shape asked for only once (each step of a zoom, a pane dragged by
fractions of a pixel, a resize) is still worked out for just the part
shown, so those don't get slower: working out the whole pane when only
a corner is in view cost 1.8x before this rule.

The cache is bounded in bytes (128 MB, 32 MB on the web), keeps the
least recently used last, skips shapes over 4M px (1M on the web), and
parallel bands share one computation (OnceLock slot). Renders count
once per render_view / render_view_single; bands don't.

Output: digests of 30 renders (5 looks, square and rounded, scales 1,
1.37, 2) are identical to main; a cut through a rounded pane now equals
the whole render exactly.

Release timings (glass_render_timings, 2400 × 1600 px, min of 5):
canvas drag under the glass 49.5 → 26.5 ms, glass slider drag
104.8 → 61.6 ms, same view again 94.8 → 54.0 ms; zoom 105.0 → 93.7 ms
(no reuse: each zoom is new).

Refs #256

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

2026-10-16 06:01:49 +07:00

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perf(render): keep glass shapes a later render asks for again

2026-10-16 06:01:49 +07:00

Cargo.toml

M3: embedded image colour profiles (#136)

2026-10-12 00:11:43 +07:00