drm_ffi/
utils.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
/// Takes an `Option<&mut Vec<T>>` style buffer and gets its pointer.
macro_rules! map_ptr {
    ($buffer:expr) => {
        match $buffer {
            Some(b) => b.as_ptr() as _,
            None => 0 as _,
        }
    };
}

/// Takes an `Option<&mut Vec<T>>` style buffer and gets its allocated length.
macro_rules! map_len {
    ($buffer:expr) => {
        match $buffer {
            Some(b) => b.capacity() as _,
            None => 0,
        }
    };
}

/// Takes an `Option<&mut Vec<T>>` style buffer and shrinks it.
macro_rules! map_reserve {
    ($buffer:expr, $size:expr) => {
        match $buffer {
            Some(ref mut b) => b.reserve_exact($size - b.len()),
            _ => (),
        }
    };
}
/// Takes an `Option<&mut Vec<T>>` style buffer and shrinks it.
macro_rules! map_set {
    ($buffer:expr, $min:expr) => {
        match $buffer {
            Some(ref mut b) => unsafe { b.set_len($min) },
            _ => (),
        }
    };
}