Function sws_getCachedContext

pub unsafe extern "C" fn sws_getCachedContext(
    context: *mut SwsContext,
    srcW: i32,
    srcH: i32,
    srcFormat: i32,
    dstW: i32,
    dstH: i32,
    dstFormat: i32,
    flags: i32,
    srcFilter: *mut SwsFilter,
    dstFilter: *mut SwsFilter,
    param: *const f64,
) -> *mut SwsContext

Check if context can be reused, otherwise reallocate a new one.

If context is NULL, just calls sws_getContext() to get a new context. Otherwise, checks if the parameters are the ones already saved in context. If that is the case, returns the current context. Otherwise, frees context and gets a new context with the new parameters.

Be warned that srcFilter and dstFilter are not checked, they are assumed to remain the same.