Soften deprecation of Decoder::read_image

src/encoder/writer.rs

@@ -221,6 +221,8 @@ fn encoder_on_short_writes() {
     };
 
     let imgdata = vec![42u8; 100 * 100];
+    let mut data = crate::decoder::DecodingResult::U8(vec![]);
+
     for comp in [
         super::Compression::Uncompressed,
         super::Compression::Packbits,
@@ -240,7 +242,7 @@ fn encoder_on_short_writes() {
 
         write.inner.set_position(0);
         let mut tiff_reader = crate::decoder::Decoder::new(&mut write.inner).unwrap();
-        let mut data = tiff_reader.read_image().unwrap();
+        let _layout = tiff_reader.read_image_to_buffer(&mut data).unwrap();
 
         assert!(
             matches!(&data, crate::decoder::DecodingResult::U8(v) if *v == imgdata),