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Diffstat (limited to 'src/blueshift_randr_c.c')
| -rw-r--r-- | src/blueshift_randr_c.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/src/blueshift_randr_c.c b/src/blueshift_randr_c.c new file mode 100644 index 0000000..bf2656e --- /dev/null +++ b/src/blueshift_randr_c.c @@ -0,0 +1,292 @@ +/** + * 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); +} + |