Use iterator for reduced mip accounting

crates/render/src/images.rs

@@ -201,8 +201,8 @@ fn reduced_estimates(wants: &[Want]) -> Option<(usize, usize)> {
         }
         let shrink = level.min(usize::from(designcraft_images::MAX_REDUCED_SHRINK));
         let (decoded_w, decoded_h) = designcraft_images::reduced_jpeg_size(&w.bytes, shrink as u8)?;
-        for cached in shrink..=level {
-            levels[cached] = true;
+        for cached in levels.iter_mut().take(level + 1).skip(shrink) {
+            *cached = true;
         }
         peak = peak.max(decoded_w as usize * decoded_h as usize * 8);
         if dims.as_ref().is_none_or(|d: &Vec<(u32, u32)>| d.len() < sizes.len()) {