1 files changed, 57 insertions, 0 deletions

diff --git a/overlays/swayosd/exponential.patch b/overlays/swayosd/exponential.patch
new file mode 100644
index 00000000..eb90d739
--- /dev/null
+++ b/overlays/swayosd/exponential.patch
@@ -0,0 +1,57 @@
+diff --git a/src/brightness_backend/brightnessctl.rs b/src/brightness_backend/brightnessctl.rs
+index ccb0e11..740fdb6 100644
+--- a/src/brightness_backend/brightnessctl.rs
++++ b/src/brightness_backend/brightnessctl.rs
+@@ -107,10 +107,21 @@ impl VirtualDevice {
+                }
+        }
+ 
+-       fn set_percent(&mut self, mut val: u32) -> anyhow::Result<()> {
+-               val = val.clamp(0, 100);
+-               self.current = self.max.map(|max| val * max / 100);
+-               let _: String = self.run(("set", &*format!("{val}%")))?;
++        fn val_to_percent(&mut self, val: u32) -> u32 {
++                return ((val as f64 / self.get_max() as f64).powf(0.25) * 100_f64).round() as u32;
++        }
++        fn percent_to_val(&mut self, perc: u32) -> u32 {
++                return ((perc as f64 / 100_f64).powf(4_f64) * self.get_max() as f64).round() as u32;
++        }
++
++       fn set_percent(&mut self, val: u32) -> anyhow::Result<()> {
++                let new = self.percent_to_val(val);
++                self.set_val(new)
++       }
++       fn set_val(&mut self, val: u32) -> anyhow::Result<()> {
++                let curr = val.clamp(0, self.get_max());
++                self.current = Some(curr);
++               let _: String = self.run(("set", &*format!("{curr}")))?;
+                Ok(())
+        }
+ }
+@@ -134,20 +145,18 @@ impl BrightnessBackend for BrightnessCtl {
+ 
+        fn lower(&mut self, by: u32) -> anyhow::Result<()> {
+                let curr = self.get_current();
+-               let max = self.get_max();
+-
+-               let curr = curr * 100 / max;
++                let mut new = self.device.val_to_percent(curr).saturating_sub(by);
++                new = self.device.percent_to_val(new).min(curr.saturating_sub(1));
+ 
+-               self.device.set_percent(curr.saturating_sub(by))
++               self.device.set_val(new)
+        }
+ 
+        fn raise(&mut self, by: u32) -> anyhow::Result<()> {
+                let curr = self.get_current();
+-               let max = self.get_max();
+-
+-               let curr = curr * 100 / max;
++                let mut new = self.device.val_to_percent(curr) + by;
++                new = self.device.percent_to_val(new).max(curr + 1);
+ 
+-               self.device.set_percent(curr + by)
++               self.device.set_val(new)
+        }
+ 
+        fn set(&mut self, val: u32) -> anyhow::Result<()> {