Attachment 4038 Details for Bug 5276 – The test program

The test program

damage-bug-5.c (text/plain), 3.70 KB, created by Søren Sandmann Pedersen on 2005-12-08 07:54:11 UTC

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Creator: Søren Sandmann Pedersen

Created: 2005-12-08 07:54:11 UTC

Size: 3.70 KB

patch

obsolete

>#include <X11/Xlib.h>
>#include <X11/extensions/Xcomposite.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <unistd.h>
>
>static int comp_event;
>static int comp_error;
>
>/* This program demonstrates that moving a redirected window around
> * when it is completely covered by a non-redirected one causes drawing
> * to happen in the wrong place.
> */
>static void
>disaster (const char *what)
>{
>    fprintf (stderr, "Error: %s\n", what);
>    exit (0);
>}
>
>static void
>dump_events (Display *dpy, const char *header)
>{
>    XSync (dpy, False);
>    
>    if (header)
>	printf ("%s", header);
>    
>    while (XPending (dpy))
>    {
>	XEvent event;
>	
>	XNextEvent (dpy, &event);
>
>	if (header)
>	    printf ("  event: %d  (%lx)\n", event.type, event.xany.window);
>    }
>}
>
>static void
>paint_window (Display *dpy, Window window, unsigned long pixel)
>{
>    XGCValues gc_values;
>    GC gc;
>
>    gc_values.foreground = pixel;
>    gc = XCreateGC (dpy, window, GCForeground, &gc_values);
>
>    XFillRectangle (dpy, window, gc, 0, 0, 32000, 32000);
>
>    XFreeGC (dpy, gc);
>}
>
>int
>main (int argc, char **argv)
>{
>    Display *dpy;
>    Window main_window;
>    Window redirected_window;
>    Window non_redirected_window;
>    XGCValues gc_values;
>    GC gc;
>
>    dpy = XOpenDisplay (NULL);
>
>    /* Create main window */
>    
>    main_window = XCreateSimpleWindow (dpy, XDefaultRootWindow (dpy),
>				       100, 100, 600, 400, 0, 0, 0xffffffff);
>    XMapWindow (dpy, main_window);
>
>    if (!XCompositeQueryExtension (dpy, &comp_event, &comp_error))
>	disaster ("No composite extension found\n");
>    
>    XCompositeRedirectSubwindows (dpy,
>				  main_window,
>				  CompositeRedirectManual);
>    
>    /* (1) Create redirected subwindow with a blue background */
>
>    redirected_window = XCreateSimpleWindow (dpy, main_window,
>					     50, 50, 500, 300,
>					     0, 0, 0x000000ff);
>    XSelectInput (dpy, redirected_window, ExposureMask);
>    XMapWindow (dpy, redirected_window);
>
>    /* (2) Create unredirected subwindow, completely covering
>     * the redirected one
>     */
>    non_redirected_window = XCreateSimpleWindow (dpy, main_window,
>						 25, 25, 550, 350,
>						 0, 0, 0xaaaaaaaa);
>    XMapWindow (dpy, non_redirected_window);
>
>    XCompositeUnredirectWindow (dpy, non_redirected_window,
>				CompositeRedirectManual);
>
>    /* Discard events caused by unredirect */
>    dump_events (dpy, NULL);
>
>    /* (4) paint the non-redirected window pink */
>    paint_window (dpy, non_redirected_window, 0x00ff00ff); /* pink */
>    
>    /* (5) Paint the redirected window green */
>    paint_window (dpy, redirected_window, 0x0000ff00); /* green */
>
>    /* (6) Move the redirected window (10, 10) pixels (from 50,50 to 60,60) */
>    XMoveWindow (dpy, redirected_window, 60, 60);
>
>    /* (7) Paint the redirected window yellow, eradicating all
>     * traces of green
>     */
>    paint_window (dpy, redirected_window, 0x00ffff00); /* yellow */
>
>    /* (8) Copy all of the redirected window to the non-redirected one.
>     */
>    gc = XCreateGC (dpy, redirected_window, 0L, NULL);
>    XCopyArea (dpy, redirected_window, non_redirected_window, gc,
>	       0, 0, 500, 300, 0, 0);
>
>    /* (9) Draw a black rectangle around the area where we copied the
>     * redirected window
>     */
>    XDrawRectangle (dpy, non_redirected_window, gc, 0, 0, 500, 300);
>
>    /* 
>     * At this point, the non-redirected window should be mostly yellow
>     * with a pink L-shaped region in the lower right corner.
>     * There should be no trace of green since that was completely painted
>     * over in step (7).
>     *
>     * However, we _do_ see an L-shaped, 10 pixels wide strip of green,
>     * because somehow the borderClip didn't get updated correctly by the
>     * MoveWindow request.
>     */
>    XFlush (dpy);
>    
>    sleep (100);
>}

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Attachments on bug 5276: 4038 | 4269 | 4944

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