Clear the window on each tick just to show it properly

blit.c

@@ -100,9 +100,9 @@ main(void) {
 
     }
 
-    if (event.type == KeyPress) {
+    //if (event.type == KeyPress) {
-      break;
+      //break;
-    }
+    //}
 
     for(int x = 0; x < 100; x++) {
       for(int y = 0; y < 100; y++) {
@@ -112,6 +112,8 @@ main(void) {
 
     factor++;
 
+    XClearWindow(display, window);
+
     XCopyArea(display,
               pixmap,
               window,