/* $XConsortium: CvtCache.c,v 1.8 94/04/17 20:15:56 rws Exp $ */
/* $XFree86: xc/lib/Xmu/CvtCache.c,v 3.0 1996/06/10 10:59:21 dawes Exp $ */

/*
 
Copyright (c) 1989  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.

*/

/* 
 * Author:  Jim Fulton, MIT X Consortium
 */

#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xos.h>
#include <X11/Xmu/CvtCache.h>

#ifdef X_NOT_STDC_ENV
extern char *malloc();
#else
#include <stdlib.h>
#endif

static XmuDisplayQueue *dq = NULL;
static int _CloseDisplay(), _FreeCCDQ();



/*
 * internal utility callbacks
 */

static int _FreeCCDQ (q)
    XmuDisplayQueue *q;
{
    XmuDQDestroy (dq, False);
    dq = NULL;
}


static int _CloseDisplay (q, e)
    XmuDisplayQueue *q;
    XmuDisplayQueueEntry *e;
{
    XmuCvtCache *c;
    extern void _XmuStringToBitmapFreeCache();

    if (e && (c = (XmuCvtCache *)(e->data))) {
	_XmuStringToBitmapFreeCache (c);
	/* insert calls to free any cached memory */

    }
    return 0;
}

static void _InitializeCvtCache (c)
    register XmuCvtCache *c;
{
    extern void _XmuStringToBitmapInitCache();

    _XmuStringToBitmapInitCache (c);
    /* insert calls to init any cached memory */
}


/*
 * XmuCCLookupDisplay - return the cache entry for the indicated display;
 * initialize the cache if necessary
 */
XmuCvtCache *_XmuCCLookupDisplay (dpy)
    Display *dpy;
{
    XmuDisplayQueueEntry *e;

    /*
     * If no displays have been added before this, create the display queue.
     */
    if (!dq) {
	dq = XmuDQCreate (_CloseDisplay, _FreeCCDQ, NULL);
	if (!dq) return NULL;
    }
    
    /*
     * See if the display is already there
     */
    e = XmuDQLookupDisplay (dq, dpy);	/* see if it's there */
    if (!e) {				/* else create it */
	XmuCvtCache *c = (XmuCvtCache *) malloc (sizeof (XmuCvtCache));
	if (!c) return NULL;

	/*
	 * Add the display to the queue
	 */
	e = XmuDQAddDisplay (dq, dpy, (XPointer) c);
	if (!e) {
	    free ((char *) c);
	    return NULL;
	}

	/*
	 * initialize fields in cache
	 */
	_InitializeCvtCache (c);
    }

    /*
     * got it
     */
    return (XmuCvtCache *)(e->data);
}