chore: Resolve clippy::manual_div_ceil lints

Author: torokati44

h263/src/decoder/cpu/gather.rs

@@ -33,7 +33,7 @@ fn read_sample(
 /// Linear interpolation between two values by 0 or 50%.
 fn lerp(sample_a: u8, sample_b: u8, middle: bool) -> u8 {
     if middle {
-        ((sample_a as u16 + sample_b as u16 + 1) / 2) as u8
+        (sample_a as u16 + sample_b as u16).div_ceil(2) as u8
     } else {
         sample_a
     }

yuv/src/bt601.rs

@@ -111,8 +111,8 @@ pub fn yuv420_to_rgba(y: &[u8], chroma_b: &[u8], chroma_r: &[u8], y_width: usize
         return vec![];
     }
 
-    // the + 1 is for rounding odd numbers up
-    let br_width = (y_width + 1) / 2;
+    // rounding odd numbers up
+    let br_width = y_width.div_ceil(2);
 
     debug_assert_eq!(y.len() % y_width, 0);
     debug_assert_eq!(chroma_b.len() % br_width, 0);
@@ -122,8 +122,8 @@ pub fn yuv420_to_rgba(y: &[u8], chroma_b: &[u8], chroma_r: &[u8], y_width: usize
     let y_height = y.len() / y_width;
     let br_height = chroma_b.len() / br_width;
 
-    // the + 1 is for rounding odd numbers up
-    debug_assert_eq!((y_height + 1) / 2, br_height);
+    // rounding odd numbers up
+    debug_assert_eq!(y_height.div_ceil(2), br_height);
 
     let mut rgba = vec![0; y.len() * 4];
     let rgba_stride = y_width * 4; // 4 bytes per pixel, interleaved