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authorMattias Andrée <maandree@operamail.com>2014-02-15 21:28:12 +0100
committerMattias Andrée <maandree@operamail.com>2014-02-15 21:28:12 +0100
commitefbdffa7a4fb8d6c9c266e6cec88b3b21adf4518 (patch)
treec3aada46d221581a46028374bd707994d130c471 /src/blueshift_randr.c
parentfade time variables (diff)
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prototype for randr usage: inverts the colours
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to '')
-rw-r--r--src/blueshift_randr.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/src/blueshift_randr.c b/src/blueshift_randr.c
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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;
+}
+