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/**
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <xcb/xcb.h>
#include <xcb/randr.h>
/**
* The major version of RANDR the program expects
*/
#define RANDR_VERSION_MAJOR 1U
/**
* The minor version of RANDR the program expects
*/
#define RANDR_VERSION_MINOR 3U
/**
* Connection to the X server
*/
static xcb_connection_t* connection;
/**
* Used to store errors in
*/
static xcb_generic_error_t* error;
int main(int argc __attribute__((unused)), char** argv __attribute__((unused)))
{
xcb_randr_query_version_cookie_t version_cookie;
xcb_randr_query_version_reply_t* randr_version;
const xcb_setup_t* setup;
xcb_screen_iterator_t iter;
int screen_count;
xcb_screen_t* screens;
int screen_i;
/* Get X connection */
connection = xcb_connect(NULL, NULL);
/* Check RANDR protocol version */
version_cookie = xcb_randr_query_version(connection, RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
randr_version = xcb_randr_query_version_reply(connection, version_cookie, &error);
if (error || (randr_version == NULL))
{
fprintf(stderr, "RANDR version query returned %i", error ? error->error_code : -1);
xcb_disconnect(connection);
return 1;
}
if (randr_version->major_version != RANDR_VERSION_MAJOR || randr_version->minor_version < RANDR_VERSION_MINOR)
{
fprintf(stderr, "Unsupported RANDR version, got %u.%u, expected %u.%u\n",
randr_version->major_version, randr_version->minor_version,
RANDR_VERSION_MAJOR, RANDR_VERSION_MINOR);
free(randr_version);
xcb_disconnect(connection);
return 1;
}
free(randr_version);
/* Get screen information */
setup = xcb_get_setup(connection);
iter = xcb_setup_roots_iterator(setup);
screen_count = iter.rem;
screens = iter.data;
printf("Screen count: %i\n", screen_count);
for (screen_i = 0; screen_i < screen_count; screen_i++)
{
xcb_screen_t* screen = screens + screen_i;
xcb_randr_get_screen_resources_current_cookie_t res_cookie;
xcb_randr_get_screen_resources_current_reply_t* res_reply;
xcb_randr_output_t* outputs;
xcb_randr_crtc_t* crtcs;
int output_i;
printf("Screen: %i\n", screen_i);
res_cookie = xcb_randr_get_screen_resources_current(connection, screen->root);
res_reply = xcb_randr_get_screen_resources_current_reply(connection, res_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR screen resource query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
printf(" CRTC count: %i\n", res_reply->num_crtcs);
printf(" Output count: %i\n", res_reply->num_outputs);
outputs = xcb_randr_get_screen_resources_current_outputs(res_reply);
crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply);
for (output_i = 0; output_i < res_reply->num_outputs; output_i++)
{
xcb_randr_get_output_info_cookie_t out_cookie;
xcb_randr_get_output_info_reply_t* out_reply;
out_cookie = xcb_randr_get_output_info(connection, outputs[output_i], res_reply->config_timestamp);
out_reply = xcb_randr_get_output_info_reply(connection, out_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR output query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
printf(" Output: %i\n", output_i);
switch (out_reply->connection)
{
case XCB_RANDR_CONNECTION_CONNECTED:
{
int crtc_i;
printf(" Connection: connected\n");
printf(" Size: %i %i\n", out_reply->mm_width, out_reply->mm_height);
for (crtc_i = 0; crtc_i < res_reply->num_crtcs; crtc_i++)
if (crtcs[crtc_i] == out_reply->crtc)
printf(" CRTC: %i\n", crtc_i);
}
break;
case XCB_RANDR_CONNECTION_DISCONNECTED:
printf(" Connection: disconnected\n");
break;
case XCB_RANDR_CONNECTION_UNKNOWN:
default:
printf(" Connection: unknown\n");
break;
}
}
free(res_reply);
}
/* Free resources **/
xcb_disconnect(connection);
return 0;
}
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