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Use fallback scale if size is invalid

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Jeremy Soller 2024-08-14 17:12:41 -06:00 • committed by Victoria Brekenfeld
parent 8d2cc05f03
commit a3c81119e8
1 changed files with 8 additions and 4 deletions
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12
src/backend/kms/device.rs
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@ -676,9 +676,14 @@ pub fn calculate_scale(
) -> f64 {
let (w_mm, h_mm) = monitor_size_mm;
let (w_px, h_px) = resolution;
let shorter_res = w_px.min(h_px);
let fallback_scale = match shorter_res {
px if px <= 1600 => 1.0,
_ => 2.0,
};
if w_mm == 0 || h_mm == 0 {
// possibly projector, but could just be some no-brand display
return 1.0;
return fallback_scale;
}
let (w_in, h_in) = (w_mm as f64 / 25.4, h_mm as f64 / 25.4);
@ -686,12 +691,11 @@ pub fn calculate_scale(
// lets be really careful we don't devide by 0 (or non-normal values) when deriving values from size.
// (also the size should be positive, but the u16 arguments already force that.)
if !w_in.is_normal() || !h_in.is_normal() {
return 1.0;
return fallback_scale;
}
let diag = (w_in.powf(2.) * h_in.powf(2.)).sqrt();
let dpi = (w_px as f64 / w_in + h_px as f64 / h_in) / 2.0;
let shorter_res = if w_mm < h_mm { w_px } else { h_px };
match diag {
_diag if diag < 20. || interface == connector::Interface::EmbeddedDisplayPort => {
@ -819,7 +823,7 @@ mod test {
for &iface in &[Interface::DisplayPort, Interface::HDMIA, Interface::HDMIB] {
assert_eq!(scale(iface, 0.0, 1920, 1080), 100);
assert_eq!(scale(iface, 0.0, 2560, 1440), 100);
assert_eq!(scale(iface, 0.0, 3840, 2160), 100);
assert_eq!(scale(iface, 0.0, 3840, 2160), 200);
}
}
}