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
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*
* Copyright © Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 or 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MIRAL_WAYLAND_SHM_H
#define MIRAL_WAYLAND_SHM_H
#include <mir/geometry/size.h>
#include <wayland-client.h>
#include <memory>
#include <vector>
class WaylandShm;
struct WaylandShmPool;
class WaylandShmBuffer : public std::enable_shared_from_this<WaylandShmBuffer>
{
public:
WaylandShmBuffer(
std::shared_ptr<WaylandShmPool> pool,
void* data,
mir::geometry::Size size,
mir::geometry::Stride stride,
wl_buffer* buffer);
~WaylandShmBuffer();
auto data() const -> void* { return data_; }
auto size() const -> mir::geometry::Size { return size_; }
auto stride() const -> mir::geometry::Stride { return stride_; }
/// Returns if this buffer is currently being used by the compositor. In-use buffers keep themselves alive.
auto is_in_use() const -> bool { return self_ptr != nullptr; }
/// Marks this buffer as in-use and assumes the resulting wl_buffer is sent to the compositor. Keeps this buffer
/// alive until the compositor releases it (if it's not sent to the compositor or the compositor never releases it
/// this buffer is leaked). Should only be called if the buffer is not already in-use.
auto use() -> wl_buffer*;
private:
friend WaylandShm;
static wl_buffer_listener const buffer_listener;
static void handle_release(void *data, wl_buffer*);
std::shared_ptr<WaylandShmPool> const pool;
void* const data_;
mir::geometry::Size const size_;
mir::geometry::Stride const stride_;
wl_buffer* const buffer;
std::shared_ptr<WaylandShmBuffer> self_ptr; ///< Is set on use and cleared on release
};
/// A single WaylandShm does not efficiently provision multiple buffers for multiple window sizes. Please use one
/// WaylandShm per window (if windows may have distinct sizes)
class WaylandShm
{
public:
/// Does not take ownership of the wl_shm
WaylandShm(wl_shm* shm);
/// Always returns a buffer of the correct size that is not in-use
auto get_buffer(mir::geometry::Size size, mir::geometry::Stride stride) -> std::shared_ptr<WaylandShmBuffer>;
private:
wl_shm* const shm;
/// get_buffer() assumes all buffers in the list have the same size and stride
std::vector<std::shared_ptr<WaylandShmBuffer>> buffers;
};
#endif // MIRAL_WAYLAND_SHM_H
|
