dtourolleandClaude Opus 5
e4875498ca
FR-DSP-8's acquisition half. `dr_plat::display` surveys the session's
displays and reduces each one's profile to an output space the pipeline
can encode into, stating the mechanism per display server as
FR-PLAT-LIN-2 requires:
- X11 reads the `_ICC_PROFILE` / `_ICC_PROFILE_<n>` root-window
properties, enumerating and numbering the outputs through RandR,
which also yields the rectangles a window move is measured against.
- Wayland binds `wp_color_manager_v1` and asks each `wl_output` for
its image description, accepting either an ICC profile on a file
descriptor or primaries stated as chromaticities.
- Where neither answers, sRGB is assumed and the reason travels with
it as data rather than into a log, so the About page can say which
path the session is on.
A display profile is a measurement of one panel and is none of the four
spaces the pipeline knows. Rather than grow an ICC engine, the profile
is reduced to D50-adapted colorants and matched against the four; a
match that is merely nearest is marked as such and shown as such.
Verified on this machine: mutter 50 advertises the colour-management
global and reports eDP-1 as sRGB, and the same session forced onto X11
enumerates the output through RandR and correctly finds no atom.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
37 lines
1.4 KiB
Rust
37 lines
1.4 KiB
Rust
//! What this machine's display server will say about its monitors.
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//!
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//! The same probe the application runs at startup, printed instead of used.
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//! It exists for the reason `keyring_check` does: the answer depends entirely
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//! on the desktop the code is running on, so the only way to know which
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//! acquisition path a given machine takes is to ask it there.
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//!
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//! cargo run -p dr-plat --example display_probe
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fn main() {
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env_logger::init();
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let survey = dr_plat::DisplaySurvey::probe();
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println!("display server: {}", survey.server.label());
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println!();
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for (index, display) in survey.displays.iter().enumerate() {
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println!("[{index}] {}", display.name);
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println!(" space: {}", display.profile.space.label());
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println!(" reading: {}", display.profile.describe());
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println!(
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" source: {:?} measured: {} approximated: {}",
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display.profile.source,
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display.profile.source.is_measured(),
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display.profile.approximated
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);
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match display.bounds {
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Some(b) => println!(
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" bounds: {}×{} at ({}, {})",
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b.width, b.height, b.x, b.y
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),
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// Expected on Wayland; see `DisplaySurvey::containing`.
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None => println!(" bounds: not stated by this display server"),
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}
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println!();
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}
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}
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