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#include <stdio.h>
#include <stdlib.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xrandr.h>
typedef enum { Get, Set, Inc, Dec } op_t;
static char *program_name;
static Atom backlight;
static void
usage (void)
{
fprintf(stderr, "usage: %s [options]\n", program_name);
fprintf(stderr, " where options are:\n");
fprintf(stderr, " -display <display> or -d <display>\n");
fprintf(stderr, " -help\n");
fprintf(stderr, " -set <percentage> or = <percentage>\n");
fprintf(stderr, " -inc <percentage> or + <percentage>\n");
fprintf(stderr, " -dec <percentage> or - <percentage>\n");
fprintf(stderr, " -get\n");
/*NOTREACHED*/
exit (1);
}
static long
backlight_get (Display *dpy, RROutput output)
{
unsigned long nitems;
unsigned long bytes_after;
unsigned char *prop;
Atom actual_type;
int actual_format;
long value;
if (XRRGetOutputProperty (dpy, output, backlight,
0, 4, False, False, None,
&actual_type, &actual_format,
&nitems, &bytes_after, &prop) != Success)
return -1;
if (actual_type != XA_INTEGER || nitems != 1 || actual_format != 32)
value = -1;
else
value = *((long *) prop);
XFree (prop);
return value;
}
static void
backlight_set (Display *dpy, RROutput output, long value)
{
XRRChangeOutputProperty (dpy, output, backlight, XA_INTEGER, 32,
PropModeReplace, (unsigned char *) &value, 1);
}
int
main (int argc, char **argv)
{
char *dpy_name = NULL;
Display *dpy;
int screen;
int major, minor;
op_t op = Get;
int value = 0;
int i;
program_name = argv[0];
for (i = 1; i < argc; i++)
{
if (!strcmp (argv[i], "-display") || !strcmp ("-d", argv[i]))
{
if (++i >= argc) usage();
dpy_name = argv[i];
continue;
}
if (!strcmp (argv[i], "-set") || !strcmp (argv[i], "="))
{
if (++i >= argc) usage();
op = Set;
value = atoi (argv[i]);
continue;
}
if (argv[i][0] == '=' && isdigit (argv[i][1]))
{
op = Set;
value = atoi (argv[i] + 1);
continue;
}
if (!strcmp (argv[i], "-inc") || !strcmp (argv[i], "+"))
{
if (++i >= argc) usage();
op = Inc;
value = atoi (argv[i]);
continue;
}
if (argv[i][0] == '+' && isdigit (argv[i][1]))
{
op = Inc;
value = atoi (argv[i] + 1);
continue;
}
if (!strcmp (argv[i], "-dec") || !strcmp (argv[i], "-"))
{
if (++i >= argc) usage();
op = Dec;
value = atoi (argv[i]);
continue;
}
if (argv[i][0] == '-' && isdigit (argv[i][1]))
{
op = Dec;
value = atoi (argv[i] + 1);
continue;
}
if (!strcmp (argv[i], "-get") || !strcmp (argv[i], "-g"))
{
op = Get;
continue;
}
if (!strcmp (argv[i], "-help") || !strcmp (argv[i], "-?"))
{
usage ();
}
}
dpy = XOpenDisplay (dpy_name);
if (!dpy)
{
fprintf (stderr, "Cannot open display \"%s\"\n",
XDisplayName (dpy_name));
exit (1);
}
if (!XRRQueryVersion (dpy, &major, &minor))
{
fprintf (stderr, "RandR extension missing\n");
exit (1);
}
if (major < 1 || (major == 1 && minor < 2))
{
fprintf (stderr, "RandR version %d.%d too old\n", major, minor);
exit (1);
}
backlight = XInternAtom (dpy, "BACKLIGHT", True);
if (backlight == None)
{
fprintf (stderr, "No outputs have backlight property\n");
exit (1);
}
for (screen = 0; screen < ScreenCount (dpy); screen++)
{
Window root = RootWindow (dpy, screen);
XRRScreenResources *resources = XRRGetScreenResources (dpy, root);
int o;
if (!resources) continue;
for (o = 0; o < resources->noutput; o++)
{
RROutput output = resources->outputs[o];
XRRPropertyInfo *info;
double cur, new, step;
double min, max;
double set;
cur = backlight_get (dpy, output);
if (cur != -1)
{
info = XRRQueryOutputProperty (dpy, output, backlight);
if (info)
{
if (info->range && info->num_values == 2)
{
min = info->values[0];
max = info->values[1];
if (op == Get) {
printf ("%f\n", (cur - min) * 100 / (max - min));
} else {
set = value * (max - min) / 100;
switch (op) {
case Set:
new = min + set;
break;
case Inc:
new = cur + set;
break;
case Dec:
new = cur - set;
break;
}
if (new > max) new = max;
if (new < min) new = min;
step = (new - cur) / 50;
for (i = 0; i < 50; i++)
{
if (i == 49)
cur = new;
else
cur += step;
backlight_set (dpy, output, (long) cur);
XFlush (dpy);
usleep (10 * 1000);
}
}
}
XFree (info);
}
}
}
XRRFreeScreenResources (resources);
}
XSync (dpy, False);
}
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