From c7decddcc94718397ac67ad7789851ea045e7df1 Mon Sep 17 00:00:00 2001
From: Joakim Hulthe <joakim@hulthe.net>
Date: Mon, 14 Jul 2025 18:05:15 +0200
Subject: [PATCH] Write image buffer backwards

---
 src/main.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index ffe5e18..b13dfc5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -70,7 +70,7 @@ fn load_wallpaper(path: &Path) -> eyre::Result<GrayAlphaImage> {
 
     match image_dimensions {
         (SCREEN_W, SCREEN_H) => {}
-        (SCREEN_H, SCREEN_W) => image = image.rotate90().flipv(),
+        (SCREEN_H, SCREEN_W) => image = image.rotate270(),
         _ => bail!("Image must be {SCREEN_W}x{SCREEN_H}"),
     }
 
@@ -119,7 +119,7 @@ fn image_to_offimage_buffer(image: GrayAlphaImage) -> eyre::Result<Box<[u8; IOCT
     );
 
     // Iterate over pixels and copy them into `buf`.
-    for (i, pixel) in image.chunks_exact(2).enumerate() {
+    for (i, pixel) in (0..buf.len()).rev().zip(image.chunks_exact(2)) {
         let &[gray, alpha] = pixel else {
             unreachable!()
         };