/** * 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 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <inttypes.h> #include <alloca.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 /** * Connection to the X server */ static xcb_connection_t* connection; /** * Used to store errors in */ static xcb_generic_error_t* error; /** * Main entry point of the program * * @param argc Length of `argv` * @param argv Command line arguments * @return Zero on success */ int main(int argc, char** argv) { 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; int screen_count; xcb_screen_t* screens; int screen_i; int i; (void) argc; (void) argv; /* Get X connection */ connection = xcb_connect(NULL, NULL); /* 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 screen information */ setup = xcb_get_setup(connection); iter = xcb_setup_roots_iterator(setup); screen_count = iter.rem; screens = iter.data; printf("Screen count: %i\n", screen_count); for (screen_i = 0; screen_i < screen_count; screen_i++) { xcb_screen_t* screen = screens + screen_i; xcb_randr_get_screen_resources_current_cookie_t res_cookie; xcb_randr_get_screen_resources_current_reply_t* res_reply; xcb_randr_output_t* outputs; xcb_randr_crtc_t* crtcs; int output_i; printf("Screen: %i\n", screen_i); 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; } printf(" CRTC count: %i\n", res_reply->num_crtcs); printf(" Output count: %i\n", res_reply->num_outputs); /* Get output information */ outputs = xcb_randr_get_screen_resources_current_outputs(res_reply); crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply); for (output_i = 0; output_i < res_reply->num_outputs; output_i++) { xcb_randr_get_output_info_cookie_t out_cookie; xcb_randr_get_output_info_reply_t* out_reply; char* name; unsigned char* name_; out_cookie = xcb_randr_get_output_info(connection, outputs[output_i], res_reply->config_timestamp); out_reply = xcb_randr_get_output_info_reply(connection, out_cookie, &error); if (error) { fprintf(stderr, "RANDR output query returned %i\n", error->error_code); xcb_disconnect(connection); free(res_reply); return 1; } printf(" Output: %i\n", output_i); name_ = xcb_randr_get_output_info_name(out_reply); name = alloca((out_reply->name_len + 1) * sizeof(char)); memcpy(name, name_, out_reply->name_len * sizeof(char)); *(name + out_reply->name_len) = 0; printf(" Name: %s\n", name); switch (out_reply->connection) { case XCB_RANDR_CONNECTION_CONNECTED: { xcb_randr_list_output_properties_cookie_t prop_cookie; xcb_randr_list_output_properties_reply_t* prop_reply; xcb_atom_t* atoms; xcb_atom_t* atoms_end; int crtc_i; printf(" Connection: connected\n"); printf(" Size: %i %i\n", out_reply->mm_width, out_reply->mm_height); for (crtc_i = 0; crtc_i < res_reply->num_crtcs; crtc_i++) if (crtcs[crtc_i] == out_reply->crtc) printf(" CRTC: %i\n", crtc_i); prop_cookie = xcb_randr_list_output_properties(connection, outputs[output_i]); prop_reply = xcb_randr_list_output_properties_reply(connection, prop_cookie, &error); if (error) { fprintf(stderr, "RANDR output property query returned %i\n", error->error_code); free(out_reply); free(res_reply); xcb_disconnect(connection); return 1; } /* Get output atoms */ atoms = xcb_randr_list_output_properties_atoms(prop_reply); atoms_end = atoms + xcb_randr_list_output_properties_atoms_length(prop_reply); for (; atoms != atoms_end; atoms++) { xcb_get_atom_name_cookie_t atom_name_cookie; xcb_get_atom_name_reply_t* atom_name_reply; char* atom_name; char* atom_name_; int atom_name_len; atom_name_cookie = xcb_get_atom_name(connection, *atoms); atom_name_reply = xcb_get_atom_name_reply(connection, atom_name_cookie, &error); if (error) { fprintf(stderr, "RANDR atom name query returned %i\n", error->error_code); free(prop_reply); free(out_reply); free(res_reply); xcb_disconnect(connection); return 1; } atom_name_ = xcb_get_atom_name_name(atom_name_reply); atom_name_len = xcb_get_atom_name_name_length(atom_name_reply); atom_name = alloca((atom_name_len + 1) * sizeof(char)); memcpy(atom_name, atom_name_, atom_name_len * sizeof(char)); *(atom_name + atom_name_len) = 0; /* Get output identifier */ if (!strcmp(atom_name, "EDID")) { xcb_randr_get_output_property_cookie_t atom_cookie; xcb_randr_get_output_property_reply_t* atom_reply; int length; unsigned char* atom_data_; char* atom_data; atom_cookie = xcb_randr_get_output_property(connection, outputs[output_i], *atoms, XCB_GET_PROPERTY_TYPE_ANY, 0, 128, 0, 0); atom_reply = xcb_randr_get_output_property_reply(connection, atom_cookie, &error); if (error) { fprintf(stderr, "RANDR atom data query returned %i\n", error->error_code); free(atom_name_reply); free(prop_reply); free(out_reply); free(res_reply); xcb_disconnect(connection); return 1; } atom_data_ = xcb_randr_get_output_property_data(atom_reply); length = xcb_randr_get_output_property_data_length(atom_reply); atom_data = alloca((2 * length + 1) * sizeof(char)); for (i = 0; i < length; i++) { *(atom_data + i * 2 + 0) = "0123456789abcdef"[(*(atom_data_ + i) >> 4) & 15]; *(atom_data + i * 2 + 1) = "0123456789abcdef"[(*(atom_data_ + i) >> 0) & 15]; } *(atom_data + 2 * length) = 0; printf(" %s: %s\n", atom_name, atom_data); free(atom_reply); } free(atom_name_reply); } free(prop_reply); } break; case XCB_RANDR_CONNECTION_DISCONNECTED: printf(" Connection: disconnected\n"); break; case XCB_RANDR_CONNECTION_UNKNOWN: default: printf(" Connection: unknown\n"); break; } free(out_reply); } free(res_reply); } /* Free resources **/ xcb_disconnect(connection); return 0; }