diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/blueshift_randr.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/blueshift_randr.c b/src/blueshift_randr.c new file mode 100644 index 0000000..64e5211 --- /dev/null +++ b/src/blueshift_randr.c @@ -0,0 +1,151 @@ +/** + * 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; +} + |