From 7b0d58ab7cf85fd1780599ea688095fbab8651f7 Mon Sep 17 00:00:00 2001
From: Kornel <kornel@geekhood.net>
Date: Mon, 2 Oct 2023 12:30:30 +0100
Subject: [PATCH] Eliminate extra length checks from diff() loop

---
 src/encoder.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/encoder.rs b/src/encoder.rs
index 993fcdcd4e..ef63894320 100644
--- a/src/encoder.rs
+++ b/src/encoder.rs
@@ -1359,7 +1359,14 @@ fn diff<T: Pixel>(
 ) {
   debug_assert!(dst.len() % src1.rect().width == 0);
   let width = src1.rect().width;
-  if width == 0 || width != src2.rect().width {
+  let height = src1.rect().height;
+
+  if width == 0
+    || width != src2.rect().width
+    || height == 0
+    || src1.rows_iter().len() != src2.rows_iter().len()
+  {
+    debug_assert!(false);
     return;
   }