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Add --screenshot CLI mode for automated capture

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Renders a single view ("bar" or "control-panel"), captures it via
bread-screenshots, then exits — driven by bread-ecosystem's bread-capture
orchestrator, or runnable standalone for one-off captures.

Waits on GTK's map signal (plus a short settle delay) before capturing
rather than guessing a fixed sleep upfront: the control-panel view in
particular needs the popover's autohide disabled (a programmatic popup()
has no input-event serial to grab the Wayland seat with) and a longer
settle window so the CPU/RAM/PWR/GPU/network stats — populated by a
2-second background poller, not the popover's own open — have had at
least one full cycle to fill in before the capture fires.

--width/--height match whatever canvas bread-capture's isolation sizes
the compositor to, so the "bar" view's geometry doesn't depend on
querying anything at capture time.

Needs RelmApp::with_args(vec![]) (GLib's own arg parser otherwise rejects
--screenshot/--output before clap ever sees them) and
allow_multiple_instances(true) for screenshot runs specifically, since
GApplication is single-instance by default and this machine typically
already has a real breadbar running.
This commit is contained in:
Breadway 2026-07-29 11:15:57 +08:00
parent a00934a53d
commit ac6ccfe88a
4 changed files with 439 additions and 116 deletions
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4
Cargo.toml
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@ -17,6 +17,8 @@ bread-theme = { git = "https://github.com/Breadway/bread-ecosystem", branch = "d
# instead of hand-parsing serde_json::Value. See src/widgets/.
bread-utils = { git = "https://git.breadway.dev/Breadway/bread-ecosystem", branch = "dev", features = ["bread-client"] }
bread-shared = { git = "https://git.breadway.dev/Breadway/bread", branch = "dev" }
# Capture primitives for `--screenshot` mode — see src/screenshot.rs.
bread-screenshots = { git = "https://git.breadway.dev/Breadway/bread-ecosystem", branch = "dev" }
gtk4 = { version = "0.11", features = ["v4_12"] }
gtk4-layer-shell = "0.8"
relm4 = { version = "0.11", features = ["macros"] }
@ -26,6 +28,8 @@ zbus = { version = "5", default-features = false, features = ["tokio"] }
tokio = { version = "1", features = ["rt-multi-thread", "macros", "time", "process", "signal", "sync"] }
serde = { version = "1", features = ["derive"] }
serde_json = "1"
clap = { version = "4", features = ["derive"] }
anyhow = "1"
# Pure-Rust SVG rasteriser (default features off → no text/font deps; the icons
# are vector-only). Needed because librsvg dropped its gdk-pixbuf SVG loader.
resvg = { version = "0.47", default-features = false }