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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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Cargo.lock generated
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@ -155,6 +155,7 @@ dependencies = [
"anyhow",
"bread-utils",
"clap",
"image",
]
[[package]]
@ -222,6 +223,18 @@ version = "3.20.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "72f5acc6cb2ba439de613abc23857ec3d78374d8ed5ac84e9d11336e87da8649"
[[package]]
name = "bytemuck"
version = "1.25.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "95832e849adfb21180ccb6826a99da14e5d266ae5c2e668e1602cf234f153797"
[[package]]
name = "byteorder-lite"
version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8f1fe948ff07f4bd06c30984e69f5b4899c516a3ef74f34df92a2df2ab535495"
[[package]]
name = "cairo-rs"
version = "0.22.0"
@ -591,6 +604,15 @@ version = "2.4.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9f1f227452a390804cdb637b74a86990f2a7d7ba4b7d5693aac9b4dd6defd8d6"
[[package]]
name = "fdeflate"
version = "0.3.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e6853b52649d4ac5c0bd02320cddc5ba956bdb407c4b75a2c6b75bf51500f8c"
dependencies = [
"simd-adler32",
]
[[package]]
name = "field-offset"
version = "0.3.6"
@ -1183,6 +1205,19 @@ dependencies = [
"icu_properties",
]
[[package]]
name = "image"
version = "0.25.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "85ab80394333c02fe689eaf900ab500fbd0c2213da414687ebf995a65d5a6104"
dependencies = [
"bytemuck",
"byteorder-lite",
"moxcms",
"num-traits",
"png",
]
[[package]]
name = "indexmap"
version = "2.14.0"
@ -1362,6 +1397,16 @@ dependencies = [
"syn",
]
[[package]]
name = "moxcms"
version = "0.8.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bb85c154ba489f01b25c0d36ae69a87e4a1c73a72631fc6c0eb6dde34a73e44b"
dependencies = [
"num-traits",
"pxfm",
]
[[package]]
name = "ndarray"
version = "0.17.2"
@ -1519,6 +1564,19 @@ version = "0.3.33"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "19f132c84eca552bf34cab8ec81f1c1dcc229b811638f9d283dceabe58c5569e"
[[package]]
name = "png"
version = "0.18.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "60769b8b31b2a9f263dae2776c37b1b28ae246943cf719eb6946a1db05128a61"
dependencies = [
"bitflags",
"crc32fast",
"fdeflate",
"flate2",
"miniz_oxide",
]
[[package]]
name = "portable-atomic"
version = "1.14.0"
@ -1570,6 +1628,12 @@ dependencies = [
"unicode-ident",
]
[[package]]
name = "pxfm"
version = "0.1.30"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d55d956fa96f5ec02be2e13af0e20391a5aa83d6a074e3ad368959d0fab299ea"
[[package]]
name = "quote"
version = "1.0.46"