refactor: move kra to crate

in the interest of reusing that code in a gallery app

src/kra.rs

@@ -1,40 +0,0 @@
-use std::{
-    ffi::OsString,
-    io::{self, Read},
-};
-
-use image::{
-    ImageDecoder, ImageError, ImageReader, ImageResult,
-    error::DecodingError,
-    hooks::{self, GenericReader},
-};
-use zip::ZipArchive;
-
-pub fn register() -> bool {
-    hooks::register_decoding_hook(OsString::from("kra"), Box::new(hook))
-}
-
-fn hook<'a>(reader: GenericReader<'a>) -> ImageResult<Box<dyn ImageDecoder + 'a>> {
-    let mut zip = ZipArchive::new(reader).map_err(to_image_error)?;
-
-    let mut reader = zip.by_name("mergedimage.png").map_err(to_image_error)?;
-
-    // reading it all and wrapping it with a Cursor
-    // is the only way I know to give it Seek
-    // (which is required by ImageReader)
-    let mut buf = Vec::new();
-    reader.read_to_end(&mut buf)?;
-
-    let image_reader = ImageReader::with_format(io::Cursor::new(buf), image::ImageFormat::Png);
-
-    Ok(Box::new(image_reader.into_decoder()?))
-}
-
-fn to_image_error(
-    e: impl Into<Box<dyn std::error::Error + std::marker::Send + Sync + 'static>>,
-) -> ImageError {
-    ImageError::Decoding(DecodingError::new(
-        image::error::ImageFormatHint::PathExtension("kra".into()),
-        e,
-    ))
-}

src/main.rs

@@ -15,7 +15,6 @@ use iced::{
 use image::{EncodableLayout, RgbaImage, imageops};
 use size::Size;
 
-mod kra;
 mod utils;
 
 #[derive(Clone, Debug)]
@@ -302,7 +301,7 @@ impl State {
 
 fn main() -> Result<(), iced::Error> {
     jxl_oxide::integration::register_image_decoding_hook();
-    kra::register();
+    kra_image_integration::register();
 
     iced::application(State::new, State::update, State::view)
         .subscription(State::subscription)