xapp-jxl-thumbnailer forces djxl --bits_per_sample 16, causing thumbnail generation to fail with libjxl 0.7.0

[Redsandro]

Distribution

Mint 22.3

Package version

3.2.2+zena

Graphics hardware in use

No response

Frequency

Always

Bug description

Jpeg XL .jxl image/jxl image thumbnails do not work in Linux Mint, desktop, Nemo, etc. because xapp-jxl-thumbnailer uses a failing command.

/usr/bin/xapp-jxl-thumbnailer:

try:
    with tempfile.NamedTemporaryFile(dir=XApp.get_tmp_dir(), suffix=".png") as tempf:
        output = subprocess.check_output([
            "djxl", "--bits_per_sample", "16", "--num_threads", "1", "--quiet", t.args.input, tempf.name
        ])

Steps to reproduce

1. Create a JXL:

cjxl image.png image.jxl

2. Verify djxl works:

djxl image.jxl out.png

3. Verify command from /usr/bin/xapp-jxl-thumbnailer fails:

djxl --bits_per_sample 16 image.jxl out16.png
# ./lib/extras/enc/encode.cc:62: JXL_FAILURE: Bit depth does not fit pixel data type
# ./lib/extras/enc/apng.cc:201: JXL_RETURN_IF_ERROR code=1: VerifyPackedImage(frame.color, ppf.info)
# Encode failed

Expected behavior

Free thumbnails

Additional information

Workaround

try:
    with tempfile.NamedTemporaryFile(dir=XApp.get_tmp_dir(), suffix=".png") as tempf:
        output = subprocess.check_output([
-            "djxl", "--bits_per_sample", "16", "--num_threads", "1", "--quiet", t.args.input, tempf.name
+            "djxl", "--num_threads", "1", "--quiet", t.args.input, tempf.name
        ])

[leigh123linux]

File it at https://github.com/linuxmint/xapp-thumbnailers/issues