Function mupdf_sys::fz_invert_pixmap_rect

pub unsafe extern "C" fn fz_invert_pixmap_rect(
    ctx: *mut fz_context,
    image: *mut fz_pixmap,
    rect: fz_irect
)

Invert all the pixels in a given rectangle of a pixmap. All components of all pixels in the rectangle are inverted (except alpha, which is unchanged).