Data commit

Task/Window-creation-X11/C/window-creation-x11-1.c

@@ -0,0 +1,37 @@
+#include <X11/Xlib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(void) {
+   Display *d;
+   Window w;
+   XEvent e;
+   const char *msg = "Hello, World!";
+   int s;
+
+   d = XOpenDisplay(NULL);
+   if (d == NULL) {
+      fprintf(stderr, "Cannot open display\n");
+      exit(1);
+   }
+
+   s = DefaultScreen(d);
+   w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 100, 100, 1,
+                           BlackPixel(d, s), WhitePixel(d, s));
+   XSelectInput(d, w, ExposureMask | KeyPressMask);
+   XMapWindow(d, w);
+
+   while (1) {
+      XNextEvent(d, &e);
+      if (e.type == Expose) {
+         XFillRectangle(d, w, DefaultGC(d, s), 20, 20, 10, 10);
+         XDrawString(d, w, DefaultGC(d, s), 10, 50, msg, strlen(msg));
+      }
+      if (e.type == KeyPress)
+         break;
+   }
+
+   XCloseDisplay(d);
+   return 0;
+}

Task/Window-creation-X11/C/window-creation-x11-2.c

@@ -0,0 +1,83 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <xcb/xcb.h>
+
+int main ()
+{
+  xcb_connection_t    *c;
+  xcb_screen_t        *screen;
+  xcb_drawable_t       win;
+  xcb_gcontext_t       foreground;
+  xcb_gcontext_t       background;
+  xcb_generic_event_t *e;
+  uint32_t             mask = 0;
+  uint32_t             values[2];
+
+  char string[] = "Hello, XCB!";
+  uint8_t string_len = strlen(string);
+
+  xcb_rectangle_t rectangles[] = {
+    {40, 40, 20, 20},
+  };
+
+  c = xcb_connect (NULL, NULL);
+
+  /* get the first screen */
+  screen = xcb_setup_roots_iterator (xcb_get_setup (c)).data;
+
+  /* root window */
+  win = screen->root;
+
+  /* create black (foreground) graphic context */
+  foreground = xcb_generate_id (c);
+  mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
+  values[0] = screen->black_pixel;
+  values[1] = 0;
+  xcb_create_gc (c, foreground, win, mask, values);
+
+  /* create white (background) graphic context */
+  background = xcb_generate_id (c);
+  mask = XCB_GC_BACKGROUND | XCB_GC_GRAPHICS_EXPOSURES;
+  values[0] = screen->white_pixel;
+  values[1] = 0;
+  xcb_create_gc (c, background, win, mask, values);
+
+  /* create the window */
+  win = xcb_generate_id(c);
+  mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
+  values[0] = screen->white_pixel;
+  values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS;
+  xcb_create_window (c,                             /* connection    */
+                     XCB_COPY_FROM_PARENT,          /* depth         */
+                     win,                           /* window Id     */
+                     screen->root,                  /* parent window */
+                     0, 0,                          /* x, y          */
+                     150, 150,                      /* width, height */
+                     10,                            /* border_width  */
+                     XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class         */
+                     screen->root_visual,           /* visual        */
+                     mask, values);                 /* masks         */
+
+  /* map the window on the screen */
+  xcb_map_window (c, win);
+
+  xcb_flush (c);
+
+  while ((e = xcb_wait_for_event (c))) {
+    switch (e->response_type & ~0x80) {
+    case XCB_EXPOSE:
+      xcb_poly_rectangle (c, win, foreground, 1, rectangles);
+      xcb_image_text_8 (c, string_len, win, background, 20, 20, string);
+      xcb_flush (c);
+      break;
+    case XCB_KEY_PRESS:
+      goto endloop;
+    }
+    free (e);
+  }
+  endloop:
+
+  return 0;
+}