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From: garya@garya.Solbourne.COM (Gary Aitken)
Newsgroups: comp.windows.x
Subject: XFreeColors bug
Message-ID: <1990Nov30.205231.21765@Solbourne.COM>
Date: 30 Nov 90 20:52:31 GMT
Sender: news@Solbourne.COM
Organization: Solbourne Computer, Inc.
Lines: 51

The following program demonstrates an XFreeColors Bug in the X11R4 library.
If one creates a private colormap and allocates cells in it via the create
call, those cells cannot be freed.
However, if the cells are not allocated during the create, but are instead
specifically allocated later, they can be freed.
================================  cut here  ===================
/*
 *	If:
 *		A colormap is created and all cells are allocated in the create call
 *	Then:
 *		An attempt to free one of the allocated cells will fail.
 */
#include <X11/X.h>
#include <X11/Xlib.h>

 main (argc, argv)
			int		argc ;
			char		**argv ;
{
			Display		*dpy ;
			int		screen;
			Window		win ;
			XColor		clr_def ;
			Colormap	color_map ;
			Colormap	def_color_map ;
			unsigned long	pxl ;


	dpy = XOpenDisplay(0);
	screen = DefaultScreen(dpy);
	def_color_map = DefaultColormapOfScreen(ScreenOfDisplay(dpy,screen)) ;
	XSynchronize(dpy,1) ;
	win = XDefaultRootWindow(dpy) ;
	if (color_map = XCreateColormap(dpy, win, DefaultVisual(dpy,screen), AllocNone)) {
		XAllocColorCells(dpy, color_map, True, 0, 0, &pxl, 1);
		printf("allocated pixel: %d\n",pxl) ;
		pxl = 0 ;
		XFreeColors(dpy, color_map, &pxl, 1, 0) ;
		printf("Color cell allocated in user code free ok\n") ;
	}
	if (color_map = XCreateColormap(dpy, win, DefaultVisual(dpy,screen), AllocAll)) {
		pxl = 0 ;
		XFreeColors(dpy, color_map, &pxl, 1, 0) ;
		printf("Color cell allocated in Xlib free ok\n") ;
	}
}
--
Gary Aitken

Solbourne Computer Inc.    ARPA: garya@Solbourne.COM
Longmont, CO               UUCP: !{boulder,sun}!stan!garya