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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
#include <assert.h>
#include <cairo.h>
#include <errno.h>
#include <fcntl.h>
#include <pango/pangocairo.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include <wayland-client.h>
#include "config.h"
#include "pool-buffer.h"
#include "util.h"
static int anonymous_shm_open(void) {
int retries = 100;
do {
// try a probably-unique name
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
pid_t pid = getpid();
char name[50];
snprintf(name, sizeof(name), "/sway-%x-%x",
(unsigned int)pid, (unsigned int)ts.tv_nsec);
// shm_open guarantees that O_CLOEXEC is set
int fd = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
if (fd >= 0) {
shm_unlink(name);
return fd;
}
--retries;
} while (retries > 0 && errno == EEXIST);
return -1;
}
static void buffer_release(void *data, struct wl_buffer *wl_buffer) {
struct pool_buffer *buffer = data;
buffer->busy = false;
}
static const struct wl_buffer_listener buffer_listener = {
.release = buffer_release
};
static struct pool_buffer *create_buffer(struct wl_shm *shm,
struct pool_buffer *buf, int32_t width, int32_t height,
uint32_t format) {
uint32_t stride = width * 4;
size_t size = stride * height;
int fd = anonymous_shm_open();
if (fd == -1) {
return NULL;
}
if (ftruncate(fd, size) < 0) {
close(fd);
return NULL;
}
void *data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
struct wl_shm_pool *pool = wl_shm_create_pool(shm, fd, size);
buf->buffer = wl_shm_pool_create_buffer(pool, 0,
width, height, stride, format);
wl_shm_pool_destroy(pool);
close(fd);
buf->size = size;
buf->width = width;
buf->height = height;
buf->data = data;
buf->surface = cairo_image_surface_create_for_data(data,
CAIRO_FORMAT_ARGB32, width, height, stride);
buf->cairo = cairo_create(buf->surface);
buf->pango = pango_cairo_create_context(buf->cairo);
wl_buffer_add_listener(buf->buffer, &buffer_listener, buf);
return buf;
}
void destroy_buffer(struct pool_buffer *buffer) {
if (buffer->buffer) {
wl_buffer_destroy(buffer->buffer);
}
if (buffer->cairo) {
cairo_destroy(buffer->cairo);
}
if (buffer->surface) {
cairo_surface_destroy(buffer->surface);
}
if (buffer->pango) {
g_object_unref(buffer->pango);
}
if (buffer->data) {
munmap(buffer->data, buffer->size);
}
memset(buffer, 0, sizeof(struct pool_buffer));
}
struct pool_buffer *get_next_buffer(struct wl_shm *shm,
struct pool_buffer pool[static 2], uint32_t width, uint32_t height) {
struct pool_buffer *buffer = NULL;
for (size_t i = 0; i < 2; ++i) {
if (pool[i].busy) {
continue;
}
buffer = &pool[i];
}
if (!buffer) {
return NULL;
}
if (buffer->width != width || buffer->height != height) {
destroy_buffer(buffer);
}
if (!buffer->buffer) {
if (!create_buffer(shm, buffer, width, height,
WL_SHM_FORMAT_ARGB8888)) {
return NULL;
}
}
buffer->busy = true;
return buffer;
}
|
