make computation of box sizes more readable

image-rs · Aug 20, 2024 · c96d460 · c96d460
1 parent c6a3c28
commit c96d460
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/src/imageops/fast_blur.rs b/src/imageops/fast_blur.rs
@@ -39,15 +39,15 @@ pub fn fast_blur<P: Pixel>(
 }
 
 fn boxes_for_gauss(sigma: f32, n: usize) -> Vec<usize> {
-    let w_ideal = f32::sqrt((12.0 * sigma * sigma / (n as f32)) + 1.0);
+    let w_ideal = f32::sqrt((12.0 * sigma.powi(2) / (n as f32)) + 1.0);
     let mut w_l = w_ideal.floor();
     if w_l % 2.0 == 0.0 {
         w_l -= 1.0
     };
     let w_u = w_l + 2.0;
 
-    let m_ideal = (12.0 * sigma * sigma
-        - (n as f32) * (w_l) * (w_l)
+    let m_ideal = (12.0 * sigma.powi(2)
+        - (n as f32) * w_l.powi(2)
         - 4.0 * (n as f32) * (w_l)
         - 3.0 * (n as f32))
         / (-4.0 * (w_l) - 4.0);