Function mupdf_sys::fz_prepare_t3_glyph

pub unsafe extern "C" fn fz_prepare_t3_glyph(
    ctx: *mut fz_context, 
    font: *mut fz_font, 
    gid: c_int
)

Force a type3 font to cache the displaylist for a given glyph id.

This caching can involve reading the underlying file, so must happen ahead of time, so we aren’t suddenly forced to read the file while playing a displaylist back.