Asdsad

src/main.rs

@@ -1,6 +1,9 @@
 use clap::Parser;
 use eyre::{Context, ContextCompat, bail, ensure, eyre};
-use image::{DynamicImage, GrayAlphaImage, ImageReader, imageops::overlay};
+use image::{
+    DynamicImage, GrayAlphaImage, ImageReader,
+    imageops::{flip_vertical_in_place, overlay},
+};
 use nix::ioctl_write_ptr;
 use std::{
     fs::File,
@@ -105,12 +108,15 @@ fn main() -> eyre::Result<()> {
     Ok(())
 }
 
-fn image_to_offimage_buffer(image: GrayAlphaImage) -> eyre::Result<Box<[u8; IOCTL_BUFFER_SIZE]>> {
+fn image_to_offimage_buffer(
+    mut image: GrayAlphaImage,
+) -> eyre::Result<Box<[u8; IOCTL_BUFFER_SIZE]>> {
     let mut buf: Box<[u8; IOCTL_BUFFER_SIZE]> = vec![0u8; IOCTL_BUFFER_SIZE]
         .into_boxed_slice()
         .try_into()
         .expect("Buffer is the correct size");
 
+    flip_vertical_in_place(&mut image);
     let image = image.into_vec();
 
     ensure!(
@@ -118,16 +124,8 @@ fn image_to_offimage_buffer(image: GrayAlphaImage) -> eyre::Result<Box<[u8; IOCT
         "Invalid size of image backing buffer. Bug?",
     );
 
-    // iterate over pixel coordinates
-    let xs = 0..SCREEN_W;
-    let ys = 0..SCREEN_H;
-    let ys = ys.rev(); // flip `y`, it's reversed in the ioctl buffer.
-    let coords = ys.flat_map(|y| xs.clone().map(move |x| (x, y)));
-    // coordinates to indices
-    let indices = coords.map(|(x, y)| y * SCREEN_W + x);
-
     // Iterate over pixels and copy them into `buf`.
-    for (i, pixel) in indices.zip(image.chunks_exact(2)) {
+    for (i, pixel) in image.chunks_exact(2).enumerate() {
         let &[gray, alpha] = pixel else {
             unreachable!()
         };