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105 lines
3.4 KiB
105 lines
3.4 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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// http://stackoverflow.com/questions/27745131
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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/xcb_image.h>
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#include <xcb/shm.h>
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#include <stdio.h>
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#define W 512
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#define H 512
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int main(){
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//connect to the X server and get screen
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xcb_connection_t* connection = xcb_connect(NULL, NULL);
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xcb_screen_t* screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
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//create a window
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uint32_t value_mask = XCB_CW_BACK_PIXEL|XCB_CW_EVENT_MASK;
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uint32_t value_list[2] = {screen->black_pixel, XCB_EVENT_MASK_EXPOSURE};
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xcb_window_t window = xcb_generate_id(connection);
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xcb_create_window(connection, screen->root_depth, window, screen->root, 0, 0, W, H, 0,
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XCB_WINDOW_CLASS_INPUT_OUTPUT, screen->root_visual, value_mask, value_list);
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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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xcb_gcontext_t 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_segment_info_t info;
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xcb_shm_query_version_reply(connection, xcb_shm_query_version(connection), NULL);
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info.shmid = shmget(IPC_PRIVATE, W*H*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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uint8_t* data = info.shmaddr;
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xcb_pixmap_t pix = xcb_generate_id(connection);
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xcb_shm_create_pixmap(connection, pix, window, W, H, screen->root_depth, info.shmseg, 0);
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uint8_t lala[W*H*4] = {0};
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const xcb_setup_t* setup = xcb_get_setup(connection);
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xcb_format_t* fmt = xcb_setup_pixmap_formats(setup);
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printf("scanline_pad %u depth %u bpp %u byte_order %u\n",
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fmt->scanline_pad, fmt->depth, fmt->bits_per_pixel, setup->image_byte_order);
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xcb_image_t* img = xcb_image_create(W,H, XCB_IMAGE_FORMAT_Z_PIXMAP,
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fmt->scanline_pad, 24, 32, 0, setup->image_byte_order, XCB_IMAGE_ORDER_LSB_FIRST, lala, W*H*4, lala);
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// xcb_image_shm_get(connection, window, img, info, 0,0, XCB_IMAGE_FORMAT_Z_PIXMAP);
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// xcb_image_shm_put(connection, window, img, info, 0,0, XCB_IMAGE_FORMAT_Z_PIXMAP);
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// --------------------------------------------------------------
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uint i = 0;
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while(1){
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data[i++] = 0xff;
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xcb_copy_area(connection, pix, window, gcontext, 0, 0, 0, 0, W, H);
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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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}
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// vim: set ts=4 sw=4:
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