328 lines
9.1 KiB
C
328 lines
9.1 KiB
C
/*
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* Copyright © 2007 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <xcb/xcb.h>
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#include <xcb/xcb_util.h>
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#include <xcb/xproto.h>
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#include <xcb/randr.h>
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#include <ctype.h>
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#include <string.h>
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#include <unistd.h>
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typedef enum { Get, Set, Inc, Dec } op_t;
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static char *program_name;
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static xcb_atom_t backlight, backlight_new, backlight_legacy;
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static void
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usage (void)
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{
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fprintf(stderr, "usage: %s [options]\n%s", program_name,
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" where options are:\n"
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" -display <display> or -d <display>\n"
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" -help\n"
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" -set <percentage> or = <percentage>\n"
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" -inc <percentage> or + <percentage>\n"
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" -dec <percentage> or - <percentage>\n"
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" -get\n"
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" -time <fade time in milliseconds>\n"
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" -steps <number of steps in fade>\n");
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exit (1);
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}
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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;
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xcb_randr_get_output_property_reply_t *prop_reply = NULL;
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xcb_randr_get_output_property_cookie_t prop_cookie;
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long value;
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backlight = backlight_new;
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if (backlight != XCB_ATOM_NONE) {
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prop_cookie = xcb_randr_get_output_property (conn, output,
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backlight, XCB_ATOM_NONE,
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0, 4, 0, 0);
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prop_reply = xcb_randr_get_output_property_reply (conn, prop_cookie, &error);
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if (error != NULL || prop_reply == NULL) {
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backlight = backlight_legacy;
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if (backlight != XCB_ATOM_NONE) {
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prop_cookie = xcb_randr_get_output_property (conn, output,
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backlight, XCB_ATOM_NONE,
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0, 4, 0, 0);
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prop_reply = xcb_randr_get_output_property_reply (conn, prop_cookie, &error);
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if (error != NULL || prop_reply == NULL) {
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return -1;
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}
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}
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}
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}
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if (prop_reply == NULL ||
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prop_reply->type != XCB_ATOM_INTEGER ||
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prop_reply->num_items != 1 ||
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prop_reply->format != 32) {
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value = -1;
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} else {
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value = *((int32_t *) xcb_randr_get_output_property_data (prop_reply));
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}
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free (prop_reply);
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return value;
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}
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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,
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32, XCB_PROP_MODE_REPLACE,
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1, (unsigned char *)&value);
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}
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int
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main (int argc, char **argv)
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{
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char *dpy_name = NULL;
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op_t op = Get;
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int value = 0;
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int i;
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int total_time = 200; /* ms */
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int steps = 20;
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xcb_connection_t *conn;
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xcb_generic_error_t *error;
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xcb_randr_query_version_cookie_t ver_cookie;
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xcb_randr_query_version_reply_t *ver_reply;
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xcb_intern_atom_cookie_t backlight_cookie[2];
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xcb_intern_atom_reply_t *backlight_reply;
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xcb_screen_iterator_t iter;
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program_name = argv[0];
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for (i = 1; i < argc; i++)
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{
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if (!strcmp (argv[i], "-display") || !strcmp ("-d", argv[i]))
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{
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if (++i >= argc) usage();
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dpy_name = argv[i];
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continue;
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}
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if (!strcmp (argv[i], "-set") || !strcmp (argv[i], "="))
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{
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if (++i >= argc) usage();
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op = Set;
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value = atoi (argv[i]);
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continue;
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}
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if (argv[i][0] == '=' && isdigit (argv[i][1]))
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{
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op = Set;
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value = atoi (argv[i] + 1);
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continue;
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}
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if (!strcmp (argv[i], "-inc") || !strcmp (argv[i], "+"))
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{
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if (++i >= argc) usage();
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op = Inc;
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value = atoi (argv[i]);
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continue;
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}
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if (argv[i][0] == '+' && isdigit (argv[i][1]))
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{
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op = Inc;
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value = atoi (argv[i] + 1);
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continue;
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}
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if (!strcmp (argv[i], "-dec") || !strcmp (argv[i], "-"))
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{
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if (++i >= argc) usage();
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op = Dec;
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value = atoi (argv[i]);
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continue;
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}
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if (argv[i][0] == '-' && isdigit (argv[i][1]))
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{
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op = Dec;
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value = atoi (argv[i] + 1);
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continue;
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}
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if (!strcmp (argv[i], "-get") || !strcmp (argv[i], "-g"))
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{
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op = Get;
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continue;
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}
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if (!strcmp (argv[i], "-time"))
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{
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if (++i >= argc) usage();
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total_time = atoi (argv[i]);
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continue;
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}
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if (!strcmp (argv[i], "-steps"))
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{
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if (++i >= argc) usage();
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steps = atoi (argv[i]);
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continue;
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}
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if (!strcmp (argv[i], "-help") || !strcmp (argv[i], "-?"))
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{
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usage ();
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}
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usage ();
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}
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conn = xcb_connect (dpy_name, NULL);
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ver_cookie = xcb_randr_query_version (conn, 1, 2);
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ver_reply = xcb_randr_query_version_reply (conn, ver_cookie, &error);
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if (error != NULL || ver_reply == NULL) {
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int ec = error ? error->error_code : -1;
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fprintf (stderr, "RANDR Query Version returned error %d\n", ec);
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exit (1);
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}
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if (ver_reply->major_version != 1 ||
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ver_reply->minor_version < 2) {
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fprintf (stderr, "RandR version %d.%d too old\n",
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ver_reply->major_version, ver_reply->minor_version);
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exit (1);
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}
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free (ver_reply);
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backlight_cookie[0] = xcb_intern_atom (conn, 1, strlen("Backlight"), "Backlight");
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backlight_cookie[1] = xcb_intern_atom (conn, 1, strlen("BACKLIGHT"), "BACKLIGHT");
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backlight_reply = xcb_intern_atom_reply (conn, backlight_cookie[0], &error);
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if (error != NULL || backlight_reply == NULL) {
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int ec = error ? error->error_code : -1;
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fprintf (stderr, "Intern Atom returned error %d\n", ec);
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exit (1);
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}
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backlight_new = backlight_reply->atom;
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free (backlight_reply);
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backlight_reply = xcb_intern_atom_reply (conn, backlight_cookie[1], &error);
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if (error != NULL || backlight_reply == NULL) {
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int ec = error ? error->error_code : -1;
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fprintf (stderr, "Intern Atom returned error %d\n", ec);
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exit (1);
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}
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backlight_legacy = backlight_reply->atom;
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free (backlight_reply);
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if (backlight_new == XCB_NONE && backlight_legacy == XCB_NONE) {
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fprintf (stderr, "No outputs have backlight property\n");
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exit (1);
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}
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iter = xcb_setup_roots_iterator (xcb_get_setup (conn));
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while (iter.rem) {
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xcb_screen_t *screen = iter.data;
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xcb_window_t root = screen->root;
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xcb_randr_output_t *outputs;
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xcb_randr_get_screen_resources_cookie_t resources_cookie;
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xcb_randr_get_screen_resources_reply_t *resources_reply;
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resources_cookie = xcb_randr_get_screen_resources (conn, root);
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resources_reply = xcb_randr_get_screen_resources_reply (conn, resources_cookie, &error);
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if (error != NULL || resources_reply == NULL) {
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int ec = error ? error->error_code : -1;
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fprintf (stderr, "RANDR Get Screen Resources returned error %d\n", ec);
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continue;
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}
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outputs = xcb_randr_get_screen_resources_outputs (resources_reply);
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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;
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double min, max;
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double set;
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cur = backlight_get (conn, output);
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if (cur != -1)
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{
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xcb_randr_query_output_property_cookie_t prop_cookie;
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xcb_randr_query_output_property_reply_t *prop_reply;
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prop_cookie = xcb_randr_query_output_property (conn, output, backlight);
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prop_reply = xcb_randr_query_output_property_reply (conn, prop_cookie, &error);
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if (error != NULL || prop_reply == NULL) continue;
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if (prop_reply->range &&
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xcb_randr_query_output_property_valid_values_length (prop_reply) == 2) {
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int32_t *values = xcb_randr_query_output_property_valid_values (prop_reply);
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min = values[0];
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max = values[1];
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if (op == Get) {
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printf ("%f\n", (cur - min) * 100 / (max - min));
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} else {
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set = value * (max - min) / 100;
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switch (op) {
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case Set:
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new = min + set;
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break;
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case Inc:
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new = cur + set;
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break;
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case Dec:
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new = cur - set;
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break;
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default:
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xcb_aux_sync (conn);
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return 1;
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}
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if (new > max) new = max;
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if (new < min) new = min;
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step = (new - cur) / steps;
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for (i = 0; i < steps && step != 0; i++)
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{
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if (i == steps - 1)
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cur = new;
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else
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cur += step;
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backlight_set (conn, output, (long) cur);
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xcb_flush (conn);
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usleep (total_time * 1000 / steps);
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}
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}
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}
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free (prop_reply);
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}
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}
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free (resources_reply);
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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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}
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