Function mupdf_sys::fz_image_orientation

pub unsafe extern "C" fn fz_image_orientation(
    ctx: *mut fz_context,
    image: *mut fz_image
) -> u8

Request the natural orientation of an image.

This is for images (such as JPEG) that can contain internal specifications of rotation/flips. This is ignored by all the internal decode/rendering routines, but can be used by callers (such as the image document handler) to respect such specifications.

The values used by MuPDF are as follows, with the equivalent Exif specifications given for information:

0: Undefined 1: 0 degree ccw rotation. (Exif = 1) 2: 90 degree ccw rotation. (Exif = 8) 3: 180 degree ccw rotation. (Exif = 3) 4: 270 degree ccw rotation. (Exif = 6) 5: flip on X. (Exif = 2) 6: flip on X, then rotate ccw by 90 degrees. (Exif = 5) 7: flip on X, then rotate ccw by 180 degrees. (Exif = 4) 8: flip on X, then rotate ccw by 270 degrees. (Exif = 7)