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156 lines
3.2 KiB
156 lines
3.2 KiB
/**
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* \file
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* [: description :]
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*
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* \author
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* Georg Hopp <georg@steffers.org>
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*
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* \copyright
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* Copyright © 2019 Georg Hopp
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <xcb/xcb.h>
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#include <xcb/shm.h>
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#include <xcb/xcb_image.h>
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#define WID 512
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#define HEI 512
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int main(){
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xcb_connection_t* connection;
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xcb_window_t window;
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xcb_screen_t* screen;
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xcb_gcontext_t gcontext;
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xcb_generic_event_t* event;
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uint32_t value_mask;
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uint32_t value_list[2];
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//connect to the X server and get screen
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connection = xcb_connect(NULL, NULL);
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screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
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//create a window
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value_mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
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value_list[0] = screen->black_pixel;
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value_list[1] = XCB_EVENT_MASK_EXPOSURE;
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window = xcb_generate_id(connection);
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xcb_create_window(
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connection,
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screen->root_depth,
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window,
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screen->root,
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0, 0,
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WID, HEI,
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0,
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XCB_WINDOW_CLASS_INPUT_OUTPUT,
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screen->root_visual,
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value_mask, value_list
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);
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//create a graphic context
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value_mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
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value_list[0] = screen->black_pixel;
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value_list[1] = 0;
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gcontext = xcb_generate_id(connection);
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xcb_create_gc(connection, gcontext, window, value_mask, value_list);
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//map the window onto the screen
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xcb_map_window(connection, window);
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xcb_flush(connection);
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//Shm test
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xcb_shm_query_version_reply_t* reply;
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xcb_shm_segment_info_t info;
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reply = xcb_shm_query_version_reply(
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connection,
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xcb_shm_query_version(connection),
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NULL
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);
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if(!reply || !reply->shared_pixmaps){
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printf("Shm error...\n");
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exit(0);
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}
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info.shmid = shmget(IPC_PRIVATE, WID*HEI*4, IPC_CREAT | 0777);
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info.shmaddr = shmat(info.shmid, 0, 0);
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info.shmseg = xcb_generate_id(connection);
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xcb_shm_attach(connection, info.shmseg, info.shmid, 0);
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shmctl(info.shmid, IPC_RMID, 0);
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uint32_t* data = (uint32_t*)info.shmaddr;
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xcb_pixmap_t pix = xcb_generate_id(connection);
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xcb_shm_create_pixmap(
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connection,
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pix,
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window,
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WID, HEI,
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screen->root_depth,
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info.shmseg,
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0
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);
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int i = 0;
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while(1){
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usleep(10000);
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data[i] = 0xFFFFFF;
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i++;
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xcb_copy_area(
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connection,
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pix,
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window,
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gcontext,
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0, 0, 0, 0,
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WID, HEI
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);
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xcb_flush(connection);
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}
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xcb_shm_detach(connection, info.shmseg);
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shmdt(info.shmaddr);
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xcb_free_pixmap(connection, pix);
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xcb_destroy_window(connection, window);
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xcb_disconnect(connection);
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return 0;
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}
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// vim: set ts=4 sw=4:
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