/** * \file * [: description :] * * \author * Georg Hopp <georg@steffers.org> * * \copyright * Copyright © 2019 Georg Hopp * * 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 <unistd.h> #include <sys/ipc.h> #include <sys/shm.h> #include <xcb/xcb.h> #include <xcb/shm.h> #include <xcb/xcb_image.h> #define WID 512 #define HEI 512 int main(){ xcb_connection_t* connection; xcb_window_t window; xcb_screen_t* screen; xcb_gcontext_t gcontext; xcb_generic_event_t* event; uint32_t value_mask; uint32_t value_list[2]; //connect to the X server and get screen connection = xcb_connect(NULL, NULL); screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data; //create a window value_mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK; value_list[0] = screen->black_pixel; value_list[1] = XCB_EVENT_MASK_EXPOSURE; window = xcb_generate_id(connection); xcb_create_window( connection, screen->root_depth, window, screen->root, 0, 0, WID, HEI, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT, screen->root_visual, value_mask, value_list ); //create a graphic context value_mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES; value_list[0] = screen->black_pixel; value_list[1] = 0; gcontext = xcb_generate_id(connection); xcb_create_gc(connection, gcontext, window, value_mask, value_list); //map the window onto the screen xcb_map_window(connection, window); xcb_flush(connection); //Shm test xcb_shm_query_version_reply_t* reply; xcb_shm_segment_info_t info; reply = xcb_shm_query_version_reply( connection, xcb_shm_query_version(connection), NULL ); if(!reply || !reply->shared_pixmaps){ printf("Shm error...\n"); exit(0); } info.shmid = shmget(IPC_PRIVATE, WID*HEI*4, IPC_CREAT | 0777); info.shmaddr = shmat(info.shmid, 0, 0); info.shmseg = xcb_generate_id(connection); xcb_shm_attach(connection, info.shmseg, info.shmid, 0); shmctl(info.shmid, IPC_RMID, 0); uint32_t* data = (uint32_t*)info.shmaddr; xcb_pixmap_t pix = xcb_generate_id(connection); xcb_shm_create_pixmap( connection, pix, window, WID, HEI, screen->root_depth, info.shmseg, 0 ); int i = 0; while(1){ usleep(10000); data[i] = 0xFFFFFF; i++; xcb_copy_area( connection, pix, window, gcontext, 0, 0, 0, 0, WID, HEI ); xcb_flush(connection); } xcb_shm_detach(connection, info.shmseg); shmdt(info.shmaddr); xcb_free_pixmap(connection, pix); xcb_destroy_window(connection, window); xcb_disconnect(connection); return 0; } // vim: set ts=4 sw=4: