/** * 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 /** * Data structure for CRTC caches */ typedef struct blueshift_randr_crtc { /** * Size of colour curves on the X-axis */ unsigned int curve_size; /** * CRT controller */ xcb_randr_crtc_t* crtc; } blueshift_randr_crtc_t; /** * Connection to the X server */ static xcb_connection_t* connection; /** * Used to store errors in */ static xcb_generic_error_t* error; /** * Screen resources */ static xcb_randr_get_screen_resources_current_reply_t* res_reply; /** * The first CRTC */ static blueshift_randr_crtc_t* crtcs; /** * The CRTC after the last CRTC */ static blueshift_randr_crtc_t* crtcs_end; /** * The red colour curve */ static uint16_t* r_curve; /** * The green colour curve */ static uint16_t* g_curve; /** * The blue colour curve */ static uint16_t* b_curve; /** * Start stage of colour curve control * * @param use_screen The screen to use * @return Zero on success */ int blueshift_randr_open(int use_screen) { blueshift_randr_crtc_t* crtcs_; 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; unsigned int crtc_count; xcb_randr_get_crtc_gamma_size_cookie_t gamma_size_cookie; xcb_randr_get_crtc_gamma_size_reply_t* gamma_size_reply; xcb_randr_get_crtc_gamma_cookie_t gamma_get_cookie; xcb_randr_get_crtc_gamma_reply_t* gamma_get_reply; /* Get X connection */ connection = xcb_connect(NULL, &use_screen); /* 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 X resources */ 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; } /* Get CRTC:s */ crtc_count = res_reply->num_crtcs; crtcs = malloc(crtc_count * sizeof(blueshift_randr_crtc_t)); crtcs->crtc = xcb_randr_get_screen_resources_current_crtcs(res_reply); crtcs_end = crtcs + crtc_count; /* Prepare CRTC:s */ for (crtcs_ = crtcs; crtcs_ != crtcs_end; crtcs_++) { /* Set CRTC */ if (crtcs_ != crtcs) crtcs_->crtc = (crtcs_ - 1)->crtc + 1; /* Get curve X-axis size */ gamma_size_cookie = xcb_randr_get_crtc_gamma_size(connection, *(crtcs_->crtc)); 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; } crtcs_->curve_size = gamma_size_reply->size; free(gamma_size_reply); /* Acquire curve control */ gamma_get_cookie = xcb_randr_get_crtc_gamma(connection, *(crtcs_->crtc)); gamma_get_reply = xcb_randr_get_crtc_gamma_reply(connection, gamma_get_cookie, &error); if (error) { fprintf(stderr, "RANDR CRTC gamma query returned %i\n", error->error_code); xcb_disconnect(connection); return 1; } free(gamma_get_reply); } /* Allocate curves */ r_curve = malloc(3 * 256 * sizeof(uint16_t)); g_curve = r_curve + 256; b_curve = g_curve + 256; return 0; } /** * Apply stage of colour curve control * * @param use_crtcs Mask of CRTC:s to use * @param r_curve The red colour curve * @param g_curve The green colour curve * @param b_curve The blue colour curve * @return Zero on success */ int blueshift_randr_apply(uint64_t use_crtcs, uint16_t* r_curve, uint16_t* g_curve, uint16_t* b_curve) { blueshift_randr_crtc_t* crtcs_ = crtcs; xcb_void_cookie_t gamma_set_cookie; /* Use CRTC:s */ while (crtcs_ != crtcs_end) { /* Check whether we should use the CRTC */ if ((use_crtcs & 1) == 0) goto next_crtc; /* Apply curves */ gamma_set_cookie = xcb_randr_set_crtc_gamma_checked(connection, *(crtcs_->crtc), crtcs_->curve_size, r_curve, g_curve, b_curve); error = xcb_request_check(connection, gamma_set_cookie); if (error) { fprintf(stderr, "RANDR CRTC control returned %i\n", error->error_code); return 1; } /* Next CRTC */ next_crtc: crtcs_++; use_crtcs >>= 1; } return 0; } /** * Resource freeing stage of colour curve control */ void blueshift_randr_close(void) { /* Free remaining resources */ free(r_curve); free(crtcs); free(res_reply); xcb_disconnect(connection); }