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bread-capture: rainbow-gradient isolation background instead of flat color

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A solid background can't reveal whether a surface that's supposed to be
translucent (breadbox/breadclip/breadsearch's full-screen overlay
windows, breadbar's alpha-blended notification/OSD surfaces) is actually
compositing as translucent — a flat color showing through a flat color
still just looks flat. Generates a diagonal rainbow gradient (full hue
sweep, via the `image` crate) sized exactly to the capture canvas and
sets it as Sway's output background instead.

Needed installing swaybg (the external helper Sway's `output ... bg`
config directive shells out to) — without it the bg command silently
no-ops and the canvas stays black, which is why the first attempt at
this looked identical to the old flat-color version.
This commit is contained in:
Breadway 2026-07-29 17:02:09 +08:00
parent ff17a028a3
commit e3df426996
3 changed files with 128 additions and 8 deletions
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bread-capture/Cargo.toml
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@ -16,3 +16,6 @@ path = "src/main.rs"
bread-utils = { path = "../bread-utils" }
clap = { workspace = true }
anyhow = { workspace = true }
# Generates the isolated capture canvas's rainbow-gradient background — see
# isolation.rs. png-only: no decoding, no other format support needed.
image = { version = "0.25", default-features = false, features = ["png"] }