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+/* $Xorg: LookupCmap.c,v 1.4 2001/02/09 02:03:53 xorgcvs Exp $ */
+
+/*
+
+Copyright 1989, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+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
+OPEN GROUP 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 Open Group 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 Open Group.
+
+*/
+/* $XFree86: xc/lib/Xmu/LookupCmap.c,v 1.7 2001/07/25 15:04:50 dawes Exp $ */
+
+/*
+ * Author: Donna Converse, MIT X Consortium
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <X11/Xutil.h>
+#include <X11/Xmu/StdCmap.h>
+#include <stdlib.h>
+
+/*
+ * Prototypes
+ */
+static Status lookup(Display*, int, VisualID, Atom, XStandardColormap*, Bool);
+
+/*
+ * To create a standard colormap if one does not currently exist, or
+ * replace the currently existing standard colormap, use
+ * XmuLookupStandardColormap().
+ *
+ * Given a screen, a visual, and a property, XmuLookupStandardColormap()
+ * will determine the best allocation for the property under the specified
+ * visual, and determine the whether to create a new colormap or to use
+ * the default colormap of the screen. It will call XmuStandardColormap()
+ * to create the standard colormap.
+ *
+ * If replace is true, any previous definition of the property will be
+ * replaced. If retain is true, the property and the colormap will be
+ * made permanent for the duration of the server session. However,
+ * pre-existing property definitions which are not replaced cannot be made
+ * permanent by a call to XmuLookupStandardColormap(); a request to retain
+ * resources pertains to newly created resources.
+ *
+ * Returns 0 on failure, non-zero on success. A request to create a
+ * standard colormap upon a visual which cannot support such a map is
+ * considered a failure. An example of this would be requesting any
+ * standard colormap property on a monochrome visual, or, requesting an
+ * RGB_BEST_MAP on a display whose colormap size is 16.
+ */
+
+Status
+XmuLookupStandardColormap(Display *dpy, int screen, VisualID visualid,
+ unsigned int depth, Atom property,
+ Bool replace, Bool retain)
+ /*
+ * dpy - specifies X server connection
+ * screen - specifies screen of display
+ * visualid - specifies the visual type
+ * depth - specifies the visual type
+ * property - a standard colormap property
+ * replace - specifies whether to replace
+ * retain - specifies whether to retain
+ */
+{
+ Display *odpy; /* original display connection */
+ XStandardColormap *colormap;
+ XVisualInfo vinfo_template, *vinfo; /* visual */
+ long vinfo_mask;
+ unsigned long r_max, g_max, b_max; /* allocation */
+ int count;
+ Colormap cmap; /* colormap ID */
+ Status status = 0;
+
+
+ /* Match the requested visual */
+
+ vinfo_template.visualid = visualid;
+ vinfo_template.screen = screen;
+ vinfo_template.depth = depth;
+ vinfo_mask = VisualIDMask | VisualScreenMask | VisualDepthMask;
+ if ((vinfo = XGetVisualInfo(dpy, vinfo_mask, &vinfo_template, &count)) ==
+ NULL)
+ return 0;
+
+ /* Monochrome visuals have no standard maps */
+
+ if (vinfo->colormap_size <= 2) {
+ XFree((char *) vinfo);
+ return 0;
+ }
+
+ /* If the requested property already exists on this screen, and,
+ * if the replace flag has not been set to true, return success.
+ * lookup() will remove a pre-existing map if replace is true.
+ */
+
+ if (lookup(dpy, screen, visualid, property, (XStandardColormap *) NULL,
+ replace) && !replace) {
+ XFree((char *) vinfo);
+ return 1;
+ }
+
+ /* Determine the best allocation for this property under the requested
+ * visualid and depth, and determine whether or not to use the default
+ * colormap of the screen.
+ */
+
+ if (!XmuGetColormapAllocation(vinfo, property, &r_max, &g_max, &b_max)) {
+ XFree((char *) vinfo);
+ return 0;
+ }
+
+ cmap = (property == XA_RGB_DEFAULT_MAP &&
+ visualid == XVisualIDFromVisual(DefaultVisual(dpy, screen)))
+ ? DefaultColormap(dpy, screen) : None;
+
+ /* If retaining resources, open a new connection to the same server */
+
+ if (retain) {
+ odpy = dpy;
+ if ((dpy = XOpenDisplay(XDisplayString(odpy))) == NULL) {
+ XFree((char *) vinfo);
+ return 0;
+ }
+ }
+
+ /* Create the standard colormap */
+
+ colormap = XmuStandardColormap(dpy, screen, visualid, depth, property,
+ cmap, r_max, g_max, b_max);
+
+ /* Set the standard colormap property */
+
+ if (colormap) {
+ XGrabServer(dpy);
+
+ if (lookup(dpy, screen, visualid, property, colormap, replace) &&
+ !replace) {
+ /* Someone has defined the property since we last looked.
+ * Since we will not replace it, release our own resources.
+ * If this is the default map, our allocations will be freed
+ * when this connection closes.
+ */
+ if (colormap->killid == ReleaseByFreeingColormap)
+ XFreeColormap(dpy, colormap->colormap);
+ }
+ else if (retain) {
+ XSetCloseDownMode(dpy, RetainPermanent);
+ }
+ XUngrabServer(dpy);
+ XFree((char *) colormap);
+ status = 1;
+ }
+
+ if (retain)
+ XCloseDisplay(dpy);
+ XFree((char *) vinfo);
+ return status;
+}
+
+/***************************************************************************/
+
+/* Lookup a standard colormap property. If the property is RGB_DEFAULT_MAP,
+ * the visualid is used to determine whether the indicated standard colormap
+ * exists. If the map exists and replace is true, delete the resources used
+ * by the map and remove the property. Return true if the map exists,
+ * or did exist and was deleted; return false if the map was not found.
+ *
+ * Note that this is not the way that a Status return is normally used.
+ *
+ * If new is not NULL, new points to an XStandardColormap structure which
+ * describes a standard colormap of the specified property. It will be made
+ * a standard colormap of the screen if none already exists, or if replace
+ * is true.
+ */
+
+static Status
+lookup(Display *dpy, int screen, VisualID visualid, Atom property,
+ XStandardColormap *cnew, Bool replace)
+ /*
+ * dpy - specifies display connection
+ * screen - specifies screen number
+ * visualid - specifies visualid for std map
+ * property - specifies colormap property name
+ * cnew - specifies a standard colormap
+ * replace - specifies whether to replace
+ */
+{
+ register int i;
+ int count;
+ XStandardColormap *stdcmaps, *s;
+ Window win = RootWindow(dpy, screen);
+
+ /* The property does not already exist */
+
+ if (! XGetRGBColormaps(dpy, win, &stdcmaps, &count, property)) {
+ if (cnew)
+ XSetRGBColormaps(dpy, win, cnew, 1, property);
+ return 0;
+ }
+
+ /* The property exists and is not describing the RGB_DEFAULT_MAP */
+
+ if (property != XA_RGB_DEFAULT_MAP) {
+ if (replace) {
+ XmuDeleteStandardColormap(dpy, screen, property);
+ if (cnew)
+ XSetRGBColormaps(dpy, win, cnew, 1, property);
+ }
+ XFree((char *)stdcmaps);
+ return 1;
+ }
+
+ /* The property exists and is RGB_DEFAULT_MAP */
+
+ for (i=0, s=stdcmaps; (i < count) && (s->visualid != visualid); i++, s++)
+ ;
+
+ /* No RGB_DEFAULT_MAP property matches the given visualid */
+
+ if (i == count) {
+ if (cnew) {
+ XStandardColormap *m, *maps;
+
+ s = (XStandardColormap *) malloc((unsigned) ((count+1) * sizeof
+ (XStandardColormap)));
+
+ for (i = 0, m = s, maps = stdcmaps; i < count; i++, m++, maps++) {
+ m->colormap = maps->colormap;
+ m->red_max = maps->red_max;
+ m->red_mult = maps->red_mult;
+ m->green_max = maps->green_max;
+ m->green_mult = maps->green_mult;
+ m->blue_max = maps->blue_max;
+ m->blue_mult = maps->blue_mult;
+ m->base_pixel = maps->base_pixel;
+ m->visualid = maps->visualid;
+ m->killid = maps->killid;
+ }
+ m->colormap = cnew->colormap;
+ m->red_max = cnew->red_max;
+ m->red_mult = cnew->red_mult;
+ m->green_max = cnew->green_max;
+ m->green_mult = cnew->green_mult;
+ m->blue_max = cnew->blue_max;
+ m->blue_mult = cnew->blue_mult;
+ m->base_pixel = cnew->base_pixel;
+ m->visualid = cnew->visualid;
+ m->killid = cnew->killid;
+
+ XSetRGBColormaps(dpy, win, s, ++count, property);
+ free((char *) s);
+ }
+ XFree((char *) stdcmaps);
+ return 0;
+ }
+
+ /* Found an RGB_DEFAULT_MAP property with a matching visualid */
+
+ if (replace) {
+ /* Free old resources first - we may need them, particularly in
+ * the default colormap of the screen. However, because of this,
+ * it is possible that we will destroy the old resource and fail
+ * to create a new one if XmuStandardColormap() fails.
+ */
+
+ if (count == 1) {
+ XmuDeleteStandardColormap(dpy, screen, property);
+ if (cnew)
+ XSetRGBColormaps(dpy, win, cnew, 1, property);
+ }
+ else {
+ XStandardColormap *map;
+
+ /* s still points to the matching standard colormap */
+
+ if (s->killid == ReleaseByFreeingColormap) {
+ if ((s->colormap != None) &&
+ (s->colormap != DefaultColormap(dpy, screen)))
+ XFreeColormap(dpy, s->colormap);
+ }
+ else if (s->killid != None)
+ XKillClient(dpy, s->killid);
+
+ map = (cnew) ? cnew : stdcmaps + --count;
+
+ s->colormap = map->colormap;
+ s->red_max = map->red_max;
+ s->red_mult = map->red_mult;
+ s->green_max = map->green_max;
+ s->green_mult = map->green_mult;
+ s->blue_max = map->blue_max;
+ s->blue_mult = map->blue_mult;
+ s->visualid = map->visualid;
+ s->killid = map->killid;
+
+ XSetRGBColormaps(dpy, win, stdcmaps, count, property);
+ }
+ }
+ XFree((char *) stdcmaps);
+ return 1;
+}
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