Media · Capture and devices: recorder, camera, mic meter, device choice and 3D model viewer

ScreenRecorderControls holds a recording in one pill: Record, then a live
dot and the time it has run beside pause or resume and stop, with mic and
camera toggles. CameraPreview shows host frames in the camera's shape, or
the camera off. MicLevelMeter lights segments up to the level, amber and
red near the top, with tones shared from data_display. DeviceSelector
picks a microphone, camera or speaker through Select, which may now be
empty while shut. ModelViewer shows the host's frame for an orbit that a
drag, the arrows, Command-scroll, + and - and a reset move; the orbit is
seeded from the host so fast drags add up. The gallery draws a stone
torus per orbit and frees each replaced frame.

src/data_display/measures.rs

@@ -39,6 +39,11 @@ fn tones(colors: &Palette) -> [Hsla; 3] {
     [colors.fg, colors.warning, colors.danger]
 }
 
+/// A share's color against its limits: plain, amber past the first, red past the second.
+pub(crate) fn tone(share: f32, limits: (f32, f32), colors: &Palette) -> Hsla {
+    tones(colors)[Level::of(share, thresholds(limits.0, limits.1)) as usize]
+}
+
 fn thresholds(warn: f32, danger: f32) -> (f32, f32) {
     assert!(
         0.0 < warn && warn <= danger && danger <= 1.0,
@@ -411,7 +416,17 @@ impl RenderOnce for UsageBar {
 
 #[cfg(test)]
 mod tests {
-    use super::{Level, UsageBar};
+    use super::{Level, UsageBar, tone};
+    use crate::theme::Palette;
+
+    #[test]
+    fn a_tone_follows_the_share_past_each_limit() {
+        let colors = Palette::light(false);
+        let limits = (0.8, 0.95);
+        assert_eq!(tone(0.5, limits, &colors), colors.fg);
+        assert_eq!(tone(0.85, limits, &colors), colors.warning);
+        assert_eq!(tone(0.97, limits, &colors), colors.danger);
+    }
 
     #[test]
     fn parts_that_sum_to_the_total_fill_it_despite_float_error() {

src/data_display/mod.rs

@@ -27,6 +27,7 @@ pub use codes::{Barcode, BarcodeError, QrCode, QrError};
 pub use comparison::Comparison;
 pub use feed::{Activity, ActivityFeed};
 pub use gallery::Gallery;
+pub(crate) use measures::tone;
 pub use measures::{Gauge, Meter, UsageBar};
 pub use records::{DescriptionList, PropertyGrid, PropertyGroup};
 pub use spark::Sparkline;