Fix indexing issue (#27)

image-rs · Dec 25, 2023 · b93b4e6 · b93b4e6
1 parent 681c84d
commit b93b4e6
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/extended.rs b/src/extended.rs
@@ -87,10 +87,10 @@ pub(crate) fn composite_frame(
         }
     } else if frame_has_alpha {
         for y in 0..height {
-            let frame_index = (y * frame_width as usize) * 3;
+            let frame_index = (y * frame_width as usize) * 4;
             let canvas_index = (y + frame_offset_y as usize) * canvas_width as usize * 4;
 
-            canvas[canvas_index..][..width * 4].copy_from_slice(&frame[frame_index..][..width * 3]);
+            canvas[canvas_index..][..width * 4].copy_from_slice(&frame[frame_index..][..width * 4]);
         }
     } else {
         for y in 0..height {