diff options
Diffstat (limited to 'src/randr.c')
| -rw-r--r-- | src/randr.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/src/randr.c b/src/randr.c new file mode 100644 index 0000000..5226b81 --- /dev/null +++ b/src/randr.c @@ -0,0 +1,155 @@ +/* randr.c -- X RandR gamma adjustment source + This file is part of Redshift. + + Redshift is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Redshift 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Redshift. If not, see <http://www.gnu.org/licenses/>. + + Copyright (c) 2009 Jon Lund Steffensen <jonlst@gmail.com> +*/ + +#include <stdio.h> +#include <stdlib.h> + +#include <xcb/xcb.h> +#include <xcb/randr.h> + +#include "colorramp.h" + + +int +randr_check_extension() +{ + xcb_generic_error_t *error; + + /* Open X server connection */ + xcb_connection_t *conn = xcb_connect(NULL, NULL); + + /* Query RandR version */ + xcb_randr_query_version_cookie_t ver_cookie = + xcb_randr_query_version(conn, 1, 3); + xcb_randr_query_version_reply_t *ver_reply = + xcb_randr_query_version_reply(conn, ver_cookie, &error); + + if (error) { + fprintf(stderr, "RANDR Query Version, error: %d\n", + error->error_code); + xcb_disconnect(conn); + return -1; + } + + if (ver_reply->major_version < 1 || ver_reply->minor_version < 3) { + fprintf(stderr, "Unsupported RANDR version (%u.%u)\n", + ver_reply->major_version, ver_reply->minor_version); + free(ver_reply); + xcb_disconnect(conn); + return -1; + } + + free(ver_reply); + + /* Close connection */ + xcb_disconnect(conn); + + return 0; +} + +int +randr_set_temperature(int temp, float gamma[3]) +{ + xcb_generic_error_t *error; + + /* Open X server connection */ + xcb_connection_t *conn = xcb_connect(NULL, NULL); + + /* Get first screen */ + const xcb_setup_t *setup = xcb_get_setup(conn); + xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup); + xcb_screen_t *screen = iter.data; + + /* Get list of CRTCs for the screen */ + xcb_randr_get_screen_resources_current_cookie_t res_cookie = + xcb_randr_get_screen_resources_current(conn, screen->root); + xcb_randr_get_screen_resources_current_reply_t *res_reply = + xcb_randr_get_screen_resources_current_reply(conn, res_cookie, + &error); + + if (error) { + fprintf(stderr, "RANDR Get Screen Resources Current," + " error: %d\n", error->error_code); + xcb_disconnect(conn); + return -1; + } + + xcb_randr_crtc_t *crtcs = + xcb_randr_get_screen_resources_current_crtcs(res_reply); + xcb_randr_crtc_t crtc = crtcs[0]; + + free(res_reply); + + /* Request size of gamma ramps */ + xcb_randr_get_crtc_gamma_size_cookie_t gamma_size_cookie = + xcb_randr_get_crtc_gamma_size(conn, crtc); + xcb_randr_get_crtc_gamma_size_reply_t *gamma_size_reply = + xcb_randr_get_crtc_gamma_size_reply(conn, gamma_size_cookie, + &error); + + if (error) { + fprintf(stderr, "RANDR Get CRTC Gamma Size, error: %d\n", + error->error_code); + xcb_disconnect(conn); + return -1; + } + + int gamma_ramp_size = gamma_size_reply->size; + + free(gamma_size_reply); + + if (gamma_ramp_size == 0) { + fprintf(stderr, "Error: Gamma ramp size too small, %i\n", + gamma_ramp_size); + xcb_disconnect(conn); + return -1; + } + + /* Create new gamma ramps */ + uint16_t *gamma_ramps = malloc(3*gamma_ramp_size*sizeof(uint16_t)); + if (gamma_ramps == NULL) abort(); + + uint16_t *gamma_r = &gamma_ramps[0*gamma_ramp_size]; + uint16_t *gamma_g = &gamma_ramps[1*gamma_ramp_size]; + uint16_t *gamma_b = &gamma_ramps[2*gamma_ramp_size]; + + colorramp_fill(gamma_r, gamma_g, gamma_b, gamma_ramp_size, + temp, gamma); + + /* Set new gamma ramps */ + xcb_void_cookie_t gamma_set_cookie = + xcb_randr_set_crtc_gamma_checked(conn, crtc, gamma_ramp_size, + gamma_r, gamma_g, gamma_b); + error = xcb_request_check(conn, gamma_set_cookie); + + if (error) { + fprintf(stderr, "RANDR Set CRTC Gamma, error: %d\n", + error->error_code); + free(gamma_ramps); + xcb_disconnect(conn); + return -1; + } + + free(gamma_ramps); + + /* Close connection */ + xcb_disconnect(conn); + + return 0; +} |