try to give ownership of the image to the Handle

this doesn't work without copying,
because RgbaImage is always an owned type

as such, it is likely not worth it

src/main.rs

@@ -19,7 +19,6 @@ enum Message {
 
 #[derive(Clone, Debug, Default)]
 struct State {
-    image: Option<RgbaImage>,
     image_display: Option<widget::image::Allocation>,
     image_filter: widget::image::FilterMethod,
 
@@ -168,8 +167,7 @@ impl State {
             if image.dimensions() < (100, 100) {
                 self.image_filter = widget::image::FilterMethod::Nearest;
             }
-            self.image = Some(image);
-            self.allocate_image()
+            self.allocate_image(image)
         })
     }
     fn pick_and_load_image(&mut self) -> Result<Task<Message>, String> {
@@ -180,16 +178,11 @@ impl State {
         self.error = utils::save_image(self.image.as_ref()).err();
     }
 
-    fn allocate_image(&self) -> Task<Message> {
-        let Some(image) = self.image.as_ref() else {
-            eprintln!("no image to allocate");
-            return Task::none();
-        };
-
+    fn allocate_image(&self, image: RgbaImage) -> Task<Message> {
         widget::image::allocate(widget::image::Handle::from_rgba(
             image.width(),
             image.height(),
-            unsafe { std::mem::transmute::<&[u8], &'static [u8]>(image.as_bytes()) },
+            image.into_vec(),
         ))
         .map(Message::ImageDisplayReady)
     }

src/utils.rs

@@ -4,6 +4,18 @@ use iced::widget;
 use image::{DynamicImage, ImageDecoder, ImageReader, ImageResult, RgbaImage};
 use rfd::FileDialog;
 
+pub fn image_from_handle(handle: widget::image::Handle) -> RgbaImage {
+    match handle {
+        widget::image::Handle::Rgba {
+            id,
+            width,
+            height,
+            pixels,
+        } => RgbaImage::from_raw(width, height, pixels.as_ref()).unwrap(),
+        _ => panic!("handle should always hold rgba data"),
+    }
+}
+
 pub fn load_image(path: impl AsRef<Path>) -> Result<RgbaImage, String> {
     _load_image(path).map_err(|e| e.to_string())
 }