xenocara/app/xbacklight/xbacklight.c

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/*
* Copyright © 2007 Keith Packard
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
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#include <xcb/xcb.h>
#include <xcb/xcb_util.h>
#include <xcb/xproto.h>
#include <xcb/randr.h>
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#include <ctype.h>
#include <string.h>
#include <unistd.h>
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typedef enum { Get, Set, Inc, Dec } op_t;
static char *program_name;
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static xcb_atom_t backlight, backlight_new, backlight_legacy;
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static void
usage (void)
{
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fprintf(stderr, "usage: %s [options]\n%s", program_name,
" where options are:\n"
" -display <display> or -d <display>\n"
" -help\n"
" -set <percentage> or = <percentage>\n"
" -inc <percentage> or + <percentage>\n"
" -dec <percentage> or - <percentage>\n"
" -get\n"
" -time <fade time in milliseconds>\n"
" -steps <number of steps in fade>\n");
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exit (1);
}
static long
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backlight_get (xcb_connection_t *conn, xcb_randr_output_t output)
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{
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xcb_generic_error_t *error;
xcb_randr_get_output_property_reply_t *prop_reply = NULL;
xcb_randr_get_output_property_cookie_t prop_cookie;
long value;
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backlight = backlight_new;
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if (backlight != XCB_ATOM_NONE) {
prop_cookie = xcb_randr_get_output_property (conn, output,
backlight, XCB_ATOM_NONE,
0, 4, 0, 0);
prop_reply = xcb_randr_get_output_property_reply (conn, prop_cookie, &error);
if (error != NULL || prop_reply == NULL) {
backlight = backlight_legacy;
if (backlight != XCB_ATOM_NONE) {
prop_cookie = xcb_randr_get_output_property (conn, output,
backlight, XCB_ATOM_NONE,
0, 4, 0, 0);
prop_reply = xcb_randr_get_output_property_reply (conn, prop_cookie, &error);
if (error != NULL || prop_reply == NULL) {
return -1;
}
}
}
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}
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if (prop_reply == NULL ||
prop_reply->type != XCB_ATOM_INTEGER ||
prop_reply->num_items != 1 ||
prop_reply->format != 32) {
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value = -1;
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} else {
value = *((int32_t *) xcb_randr_get_output_property_data (prop_reply));
}
free (prop_reply);
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return value;
}
static void
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backlight_set (xcb_connection_t *conn, xcb_randr_output_t output, long value)
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{
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xcb_randr_change_output_property (conn, output, backlight, XCB_ATOM_INTEGER,
32, XCB_PROP_MODE_REPLACE,
1, (unsigned char *)&value);
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}
int
main (int argc, char **argv)
{
char *dpy_name = NULL;
op_t op = Get;
int value = 0;
int i;
int total_time = 200; /* ms */
int steps = 20;
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xcb_connection_t *conn;
xcb_generic_error_t *error;
xcb_randr_query_version_cookie_t ver_cookie;
xcb_randr_query_version_reply_t *ver_reply;
xcb_intern_atom_cookie_t backlight_cookie[2];
xcb_intern_atom_reply_t *backlight_reply;
xcb_screen_iterator_t iter;
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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], "-time"))
{
if (++i >= argc) usage();
total_time = atoi (argv[i]);
continue;
}
if (!strcmp (argv[i], "-steps"))
{
if (++i >= argc) usage();
steps = atoi (argv[i]);
continue;
}
if (!strcmp (argv[i], "-help") || !strcmp (argv[i], "-?"))
{
usage ();
}
usage ();
}
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conn = xcb_connect (dpy_name, NULL);
ver_cookie = xcb_randr_query_version (conn, 1, 2);
ver_reply = xcb_randr_query_version_reply (conn, ver_cookie, &error);
if (error != NULL || ver_reply == NULL) {
int ec = error ? error->error_code : -1;
fprintf (stderr, "RANDR Query Version returned error %d\n", ec);
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exit (1);
}
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if (ver_reply->major_version != 1 ||
ver_reply->minor_version < 2) {
fprintf (stderr, "RandR version %d.%d too old\n",
ver_reply->major_version, ver_reply->minor_version);
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exit (1);
}
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free (ver_reply);
backlight_cookie[0] = xcb_intern_atom (conn, 1, strlen("Backlight"), "Backlight");
backlight_cookie[1] = xcb_intern_atom (conn, 1, strlen("BACKLIGHT"), "BACKLIGHT");
backlight_reply = xcb_intern_atom_reply (conn, backlight_cookie[0], &error);
if (error != NULL || backlight_reply == NULL) {
int ec = error ? error->error_code : -1;
fprintf (stderr, "Intern Atom returned error %d\n", ec);
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exit (1);
}
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backlight_new = backlight_reply->atom;
free (backlight_reply);
backlight_reply = xcb_intern_atom_reply (conn, backlight_cookie[1], &error);
if (error != NULL || backlight_reply == NULL) {
int ec = error ? error->error_code : -1;
fprintf (stderr, "Intern Atom returned error %d\n", ec);
exit (1);
}
backlight_legacy = backlight_reply->atom;
free (backlight_reply);
if (backlight_new == XCB_NONE && backlight_legacy == XCB_NONE) {
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fprintf (stderr, "No outputs have backlight property\n");
exit (1);
}
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iter = xcb_setup_roots_iterator (xcb_get_setup (conn));
while (iter.rem) {
xcb_screen_t *screen = iter.data;
xcb_window_t root = screen->root;
xcb_randr_output_t *outputs;
xcb_randr_get_screen_resources_cookie_t resources_cookie;
xcb_randr_get_screen_resources_reply_t *resources_reply;
resources_cookie = xcb_randr_get_screen_resources (conn, root);
resources_reply = xcb_randr_get_screen_resources_reply (conn, resources_cookie, &error);
if (error != NULL || resources_reply == NULL) {
int ec = error ? error->error_code : -1;
fprintf (stderr, "RANDR Get Screen Resources returned error %d\n", ec);
continue;
}
outputs = xcb_randr_get_screen_resources_outputs (resources_reply);
for (int o = 0; o < resources_reply->num_outputs; o++)
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{
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xcb_randr_output_t output = outputs[o];
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double cur, new, step;
double min, max;
double set;
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cur = backlight_get (conn, output);
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if (cur != -1)
{
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xcb_randr_query_output_property_cookie_t prop_cookie;
xcb_randr_query_output_property_reply_t *prop_reply;
prop_cookie = xcb_randr_query_output_property (conn, output, backlight);
prop_reply = xcb_randr_query_output_property_reply (conn, prop_cookie, &error);
if (error != NULL || prop_reply == NULL) continue;
if (prop_reply->range &&
xcb_randr_query_output_property_valid_values_length (prop_reply) == 2) {
int32_t *values = xcb_randr_query_output_property_valid_values (prop_reply);
min = values[0];
max = 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;
default:
xcb_aux_sync (conn);
return 1;
}
if (new > max) new = max;
if (new < min) new = min;
step = (new - cur) / steps;
for (i = 0; i < steps && step != 0; i++)
{
if (i == steps - 1)
cur = new;
else
cur += step;
backlight_set (conn, output, (long) cur);
xcb_flush (conn);
usleep (total_time * 1000 / steps);
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}
}
}
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free (prop_reply);
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}
}
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free (resources_reply);
xcb_screen_next (&iter);
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}
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xcb_aux_sync (conn);
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return 0;
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}