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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>
#define RANDR_VERSION_MAJOR 1U
#define RANDR_VERSION_MINOR 3U
int main(int argc __attribute__((unused)), char** argv __attribute__((unused)))
{
xcb_connection_t* connection;
xcb_generic_error_t* error;
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;
xcb_screen_t* screen;
xcb_randr_get_screen_resources_current_cookie_t res_cookie;
xcb_randr_get_screen_resources_current_reply_t* res_reply;
xcb_randr_crtc_t* crtcs;
xcb_randr_get_crtc_gamma_size_cookie_t gamma_size_cookie;
xcb_randr_get_crtc_gamma_size_reply_t* gamma_size_reply;
unsigned int curve_size;
xcb_randr_get_crtc_gamma_cookie_t gamma_get_cookie;
xcb_randr_get_crtc_gamma_reply_t* gamma_get_reply;
uint16_t* r_gamma;
uint16_t* g_gamma;
uint16_t* b_gamma;
connection = xcb_connect(NULL, NULL /* preferred screen */);
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);
setup = xcb_get_setup(connection);
iter = xcb_setup_roots_iterator(setup);
screen = iter.data;
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;
}
crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply);
gamma_size_cookie = xcb_randr_get_crtc_gamma_size(connection, *crtcs);
gamma_size_reply = xcb_randr_get_crtc_gamma_size_reply(connection, gamma_size_cookie, &error);
if (error)
{
fprintf(stderr, "RANDR CRTC gamma size query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
curve_size = gamma_size_reply->size;
free(gamma_size_reply);
gamma_get_cookie = xcb_randr_get_crtc_gamma(connection, *crtcs);
gamma_get_reply = xcb_randr_get_crtc_gamma_reply(connection, gamma_get_cookie, &error);
free(res_reply);
if (error)
{
fprintf(stderr, "RANDR CRTC gamma query returned %i\n", error->error_code);
xcb_disconnect(connection);
return 1;
}
r_gamma = xcb_randr_get_crtc_gamma_red(gamma_get_reply);
g_gamma = xcb_randr_get_crtc_gamma_green(gamma_get_reply);
b_gamma = xcb_randr_get_crtc_gamma_blue(gamma_get_reply);
for (unsigned int i = 0; i < curve_size; i++)
{
*(r_gamma + i) = (1 << 16) - 1 - *(r_gamma + i);
*(g_gamma + i) = (1 << 16) - 1 - *(g_gamma + i);
*(b_gamma + i) = (1 << 16) - 1 - *(b_gamma + i);
}
xcb_void_cookie_t gamma_set_cookie =
xcb_randr_set_crtc_gamma_checked(connection, *crtcs, curve_size, r_gamma, g_gamma, b_gamma);
error = xcb_request_check(connection, gamma_set_cookie);
if (error)
{
fprintf(stderr, "RANDR CRTC control returned %i\n", error->error_code);
return 1;
}
free(gamma_get_reply);
xcb_disconnect(connection);
return 0;
}
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