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
|
/*
* x11_support.c
*
* Created by buzzert <buzzert@buzzert.net> 2019-01-18
*/
#include "x11_support.h"
#include <stdio.h>
#include <stdlib.h>
static Window __window = { 0 };
static Display *__display = NULL;
static Window get_window_from_environment_or_make_one(Display *display, int width, int height)
{
Window window;
const char *env_window = getenv("XSCREENSAVER_WINDOW");
if (env_window != NULL && env_window[0] != 0) {
char *endptr = NULL;
unsigned long long number = strtoull(env_window, &endptr, 0);
window = (Window)number;
} else {
// Presumably this is for debugging
Window root_window = DefaultRootWindow(__display);
window = XCreateSimpleWindow(
display, // display
root_window, // parent window
0, 0, // x, y
width, // width
height, // height
0, // border_width
0, // border
0 // background
);
}
return window;
}
void x11_get_display_bounds(int *width, int *height)
{
*width = DisplayWidth(__display, DefaultScreen(__display));
*height = DisplayHeight(__display, DefaultScreen(__display));
}
cairo_surface_t* x11_helper_acquire_cairo_surface(int width, int height)
{
__display = XOpenDisplay(NULL);
if (__display == NULL) {
fprintf(stderr, "Error opening display\n");
return NULL;
}
// Create (or get) window
__window = get_window_from_environment_or_make_one(__display, width, height);
// Enable key events
XSelectInput(__display, __window, ButtonPressMask | KeyPressMask | StructureNotifyMask);
// Map window to display
XMapWindow(__display, __window);
// Create cairo surface
int screen = DefaultScreen(__display);
Visual *visual = DefaultVisual(__display, screen);
cairo_surface_t *surface = cairo_xlib_surface_create(
__display,
__window,
visual,
width,
height
);
return surface;
}
void x11_helper_destroy_surface(cairo_surface_t *surface)
{
cairo_surface_destroy(surface);
XCloseDisplay(__display);
}
|
