/**
* 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 <string.h>
#include <inttypes.h>
#include <alloca.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;
/**
* Main entry point of the program
*
* @param argc Length of `argv`
* @param argv Command line arguments
* @return Zero on success
*/
int main(int argc, char** argv)
{
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;
(void) argc;
(void) argv;
/* 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);
/* Get output information */
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;
char* name;
unsigned char* name_;
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);
free(res_reply);
return 1;
}
printf(" Output: %i\n", output_i);
name_ = xcb_randr_get_output_info_name(out_reply);
name = alloca((out_reply->name_len + 1) * sizeof(char));
memcpy(name, name_, out_reply->name_len * sizeof(char));
*(name + out_reply->name_len) = 0;
printf(" Name: %s\n", name);
switch (out_reply->connection)
{
case XCB_RANDR_CONNECTION_CONNECTED:
{
xcb_randr_list_output_properties_cookie_t prop_cookie;
xcb_randr_list_output_properties_reply_t* prop_reply;
xcb_atom_t* atoms;
xcb_atom_t* atoms_end;
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);
prop_cookie = xcb_randr_list_output_properties(connection, outputs[output_i]);
prop_reply = xcb_randr_list_output_properties_reply(connection, prop_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR output property query returned %i\n", error->error_code);
free(out_reply);
free(res_reply);
xcb_disconnect(connection);
return 1;
}
/* Get output atoms */
atoms = xcb_randr_list_output_properties_atoms(prop_reply);
atoms_end = atoms + xcb_randr_list_output_properties_atoms_length(prop_reply);
for (; atoms != atoms_end; atoms++)
{
xcb_get_atom_name_cookie_t atom_name_cookie;
xcb_get_atom_name_reply_t* atom_name_reply;
char* atom_name;
char* atom_name_;
int atom_name_len;
atom_name_cookie = xcb_get_atom_name(connection, *atoms);
atom_name_reply = xcb_get_atom_name_reply(connection, atom_name_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR atom name query returned %i\n", error->error_code);
free(prop_reply);
free(out_reply);
free(res_reply);
xcb_disconnect(connection);
return 1;
}
atom_name_ = xcb_get_atom_name_name(atom_name_reply);
atom_name_len = xcb_get_atom_name_name_length(atom_name_reply);
atom_name = alloca((atom_name_len + 1) * sizeof(char));
memcpy(atom_name, atom_name_, atom_name_len * sizeof(char));
*(atom_name + atom_name_len) = 0;
/* Get output identifier */
if (!strcmp(atom_name, "EDID"))
{
xcb_randr_get_output_property_cookie_t atom_cookie;
xcb_randr_get_output_property_reply_t* atom_reply;
int length;
unsigned char* atom_data_;
char* atom_data;
atom_cookie = xcb_randr_get_output_property(connection, outputs[output_i], *atoms,
XCB_GET_PROPERTY_TYPE_ANY, 0, 0, 0, 0);
atom_reply = xcb_randr_get_output_property_reply(connection, atom_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR atom data query returned %i\n", error->error_code);
free(atom_name_reply);
free(prop_reply);
free(out_reply);
free(res_reply);
xcb_disconnect(connection);
return 1;
}
atom_data_ = xcb_randr_get_output_property_data(atom_reply);
length = xcb_randr_get_output_property_data_length(atom_reply);
atom_data = alloca((length + 1) * sizeof(char));
memcpy(atom_data, atom_data_, length * sizeof(char));
*(atom_data + length) = 0;
/* printf(" %s: %s\n", atom_name, atom_data); TODO */
free(atom_reply);
}
free(atom_name_reply);
}
free(prop_reply);
}
break;
case XCB_RANDR_CONNECTION_DISCONNECTED:
printf(" Connection: disconnected\n");
break;
case XCB_RANDR_CONNECTION_UNKNOWN:
default:
printf(" Connection: unknown\n");
break;
}
free(out_reply);
}
free(res_reply);
}
/* Free resources **/
xcb_disconnect(connection);
return 0;
}
