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/*
* x11_support.c
*
* Created by buzzert <buzzert@buzzert.net> 2019-01-18
*/
#include "x11_support.h"
#include <X11/extensions/Xrandr.h>
#include <stdio.h>
#include <stdlib.h>
static Window __window = { 0 };
static Display *__display = NULL;
static void x11_get_display_bounds_w(Window window, unsigned int monitor_num, x11_display_bounds_t *out_bounds);
static Window get_window_from_environment_or_make_one(Display *display, int *out_width, int *out_height)
{
Window window;
Window root_window = DefaultRootWindow(__display);
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);
root_window = (Window)number;
}
// Figure out which monitor this is supposed to go on
const unsigned int preferred_monitor = get_preferred_monitor_num();
x11_display_bounds_t bounds;
x11_get_display_bounds_w(root_window, preferred_monitor, &bounds);
window = XCreateSimpleWindow(
display, // display
root_window, // parent window
bounds.x, // x
bounds.y, // y
bounds.width, // width
bounds.height, // height
0, // border_width
0, // border
0 // background
);
*out_width = bounds.width;
*out_height = bounds.height;
return window;
}
void x11_get_display_bounds(unsigned int monitor_num, x11_display_bounds_t *out_bounds)
{
x11_get_display_bounds_w(__window, monitor_num, out_bounds);
}
static void x11_get_display_bounds_w(Window window, unsigned int monitor_num, x11_display_bounds_t *out_bounds)
{
int num_monitors = 0;
XRRMonitorInfo *monitor_infos = XRRGetMonitors(__display, window, True, &num_monitors);
if (num_monitors == 0) {
fprintf(stderr, "FATAL: Couldn't get monitor info from XRandR!\n");
exit(1);
}
unsigned int idx = monitor_num;
if (idx > num_monitors) {
fprintf(stderr, "WARNING: Specified monitor number is greater than the number of connected monitors!\n");
idx = 0;
}
XRRMonitorInfo *monitor = &monitor_infos[idx];
out_bounds->x = monitor->x;
out_bounds->y = monitor->y;
out_bounds->width = monitor->width;
out_bounds->height = monitor->height;
}
unsigned int get_preferred_monitor_num()
{
const char *preferred_monitor = getenv("BUZZLOCKER_MONITOR_NUM");
if (preferred_monitor != NULL && preferred_monitor[0] != 0) {
char *endptr = NULL;
unsigned long int result = strtoul(preferred_monitor, &endptr, 0);
return result;
}
return 0;
}
cairo_surface_t* x11_helper_acquire_cairo_surface()
{
__display = XOpenDisplay(NULL);
if (__display == NULL) {
fprintf(stderr, "Error opening display\n");
return NULL;
}
// Create (or get) window
int width, height;
__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);
}
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