[Xcb] Flicker-Free Window Management?

[Bastien Dejean]

Hi,

I would like to remove the flickering that occur when windows are
mapped, moved or resized from the tiling window manager I wrote: my
strategy is to create a window whose content is the current screen
content and to map it before resizing or moving windows and to unmap it
afterwards.

Here's how I create the window:
    xcb_window_t blanket = xcb_generate_id(dpy);
    uint32_t mask = XCB_CW_OVERRIDE_REDIRECT;
    uint32_t values[] = {1};
    xcb_create_window(dpy, XCB_COPY_FROM_PARENT, blanket, screen->root, 0, 0, screen_width, screen_height, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_COPY_FROM_PARENT, mask, values);

And here's the functions mapping / unmapping it:
    void blanket_show(void)
    {
        xcb_aux_sync(dpy);
        xcb_map_window(dpy, blanket);
        xcb_aux_sync(dpy);
    }

    void blanket_hide(void)
    {
        xcb_aux_sync(dpy);
        xcb_unmap_window(dpy, blanket);
        xcb_aux_sync(dpy);
    }

Unfortunately, it is not working consistently.
What am I missing?

Greetings,
-- 
 b.d
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