Implement the correct orientation support for JPEG XL images

We now support the correct orientation if it was specified in the format's
basic info but not in Exif (or Exif is missing). We also avoid excessive
transformation if it is specified in both the basic data and Exif.

src/imageio/imageio_jpegxl.c

@@ -174,6 +174,14 @@ dt_imageio_retval_t dt_imageio_open_jpegxl(dt_image_t *img,
         return DT_IMAGEIO_FILE_CORRUPTED;
       }
 
+      // Orientation values in JXL basic info match Exif definitions
+      img->orientation = dt_image_orientation_to_flip_bits(basicinfo.orientation);
+
+      // We don't re-orient the data during decoding, this will be done later
+      // by darktable according to the metadata value (this value can be
+      // either the one obtained above or the value read from Exif data)
+      JxlDecoderSetKeepOrientation(decoder, JXL_TRUE);
+
       uint32_t num_threads =
         JxlResizableParallelRunnerSuggestThreads(basicinfo.xsize,
                                                  basicinfo.ysize);