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312 lines
10 KiB
C
312 lines
10 KiB
C
/* $XConsortium: LookupCmap.c,v 1.10 94/04/17 20:16:11 rws Exp $ */
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/*
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Copyright (c) 1989 X Consortium
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the X Consortium shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from the X Consortium.
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*/
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/*
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* Author: Donna Converse, MIT X Consortium
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <X11/Xlib.h>
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#include <X11/Xatom.h>
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#include <X11/Xutil.h>
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#include <X11/Xmu/StdCmap.h>
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static Status lookup();
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/*
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* To create a standard colormap if one does not currently exist, or
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* replace the currently existing standard colormap, use
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* XmuLookupStandardColormap().
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*
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* Given a screen, a visual, and a property, XmuLookupStandardColormap()
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* will determine the best allocation for the property under the specified
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* visual, and determine the whether to create a new colormap or to use
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* the default colormap of the screen. It will call XmuStandardColormap()
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* to create the standard colormap.
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*
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* If replace is true, any previous definition of the property will be
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* replaced. If retain is true, the property and the colormap will be
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* made permanent for the duration of the server session. However,
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* pre-existing property definitions which are not replaced cannot be made
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* permanent by a call to XmuLookupStandardColormap(); a request to retain
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* resources pertains to newly created resources.
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*
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* Returns 0 on failure, non-zero on success. A request to create a
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* standard colormap upon a visual which cannot support such a map is
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* considered a failure. An example of this would be requesting any
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* standard colormap property on a monochrome visual, or, requesting an
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* RGB_BEST_MAP on a display whose colormap size is 16.
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*/
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Status XmuLookupStandardColormap(dpy, screen, visualid, depth, property,
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replace, retain)
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Display *dpy; /* specifies X server connection */
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int screen; /* specifies screen of display */
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VisualID visualid; /* specifies the visual type */
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unsigned int depth; /* specifies the visual type */
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Atom property; /* a standard colormap property */
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Bool replace; /* specifies whether to replace */
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Bool retain; /* specifies whether to retain */
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{
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Display *odpy; /* original display connection */
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XStandardColormap *colormap;
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XVisualInfo vinfo_template, *vinfo; /* visual */
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long vinfo_mask;
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unsigned long r_max, g_max, b_max; /* allocation */
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int count;
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Colormap cmap; /* colormap ID */
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Status status = 0;
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/* Match the requested visual */
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vinfo_template.visualid = visualid;
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vinfo_template.screen = screen;
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vinfo_template.depth = depth;
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vinfo_mask = VisualIDMask | VisualScreenMask | VisualDepthMask;
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if ((vinfo = XGetVisualInfo(dpy, vinfo_mask, &vinfo_template, &count)) ==
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NULL)
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return 0;
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/* Monochrome visuals have no standard maps */
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if (vinfo->colormap_size <= 2) {
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XFree((char *) vinfo);
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return 0;
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}
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/* If the requested property already exists on this screen, and,
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* if the replace flag has not been set to true, return success.
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* lookup() will remove a pre-existing map if replace is true.
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*/
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if (lookup(dpy, screen, visualid, property, (XStandardColormap *) NULL,
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replace) && !replace) {
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XFree((char *) vinfo);
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return 1;
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}
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/* Determine the best allocation for this property under the requested
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* visualid and depth, and determine whether or not to use the default
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* colormap of the screen.
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*/
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if (!XmuGetColormapAllocation(vinfo, property, &r_max, &g_max, &b_max)) {
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XFree((char *) vinfo);
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return 0;
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}
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cmap = (property == XA_RGB_DEFAULT_MAP &&
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visualid == XVisualIDFromVisual(DefaultVisual(dpy, screen)))
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? DefaultColormap(dpy, screen) : None;
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/* If retaining resources, open a new connection to the same server */
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if (retain) {
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odpy = dpy;
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if ((dpy = XOpenDisplay(XDisplayString(odpy))) == NULL) {
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XFree((char *) vinfo);
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return 0;
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}
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}
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/* Create the standard colormap */
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colormap = XmuStandardColormap(dpy, screen, visualid, depth, property,
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cmap, r_max, g_max, b_max);
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/* Set the standard colormap property */
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if (colormap) {
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XGrabServer(dpy);
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if (lookup(dpy, screen, visualid, property, colormap, replace) &&
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!replace) {
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/* Someone has defined the property since we last looked.
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* Since we will not replace it, release our own resources.
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* If this is the default map, our allocations will be freed
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* when this connection closes.
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*/
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if (colormap->killid == ReleaseByFreeingColormap)
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XFreeColormap(dpy, colormap->colormap);
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}
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else if (retain) {
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XSetCloseDownMode(dpy, RetainPermanent);
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}
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XUngrabServer(dpy);
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XFree((char *) colormap);
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status = 1;
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}
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if (retain)
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XCloseDisplay(dpy);
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XFree((char *) vinfo);
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return status;
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}
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/***************************************************************************/
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/* Lookup a standard colormap property. If the property is RGB_DEFAULT_MAP,
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* the visualid is used to determine whether the indicated standard colormap
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* exists. If the map exists and replace is true, delete the resources used
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* by the map and remove the property. Return true if the map exists,
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* or did exist and was deleted; return false if the map was not found.
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*
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* Note that this is not the way that a Status return is normally used.
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*
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* If new is not NULL, new points to an XStandardColormap structure which
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* describes a standard colormap of the specified property. It will be made
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* a standard colormap of the screen if none already exists, or if replace
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* is true.
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*/
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static Status lookup(dpy, screen, visualid, property, new, replace)
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Display *dpy; /* specifies display connection */
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int screen; /* specifies screen number */
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VisualID visualid; /* specifies visualid for std map */
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Atom property; /* specifies colormap property name */
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XStandardColormap *new; /* specifies a standard colormap */
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Bool replace; /* specifies whether to replace */
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{
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register int i;
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int count;
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XStandardColormap *stdcmaps, *s;
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Window win = RootWindow(dpy, screen);
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/* The property does not already exist */
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if (! XGetRGBColormaps(dpy, win, &stdcmaps, &count, property)) {
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if (new)
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XSetRGBColormaps(dpy, win, new, 1, property);
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return 0;
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}
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/* The property exists and is not describing the RGB_DEFAULT_MAP */
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if (property != XA_RGB_DEFAULT_MAP) {
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if (replace) {
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XmuDeleteStandardColormap(dpy, screen, property);
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if (new)
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XSetRGBColormaps(dpy, win, new, 1, property);
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}
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XFree((char *)stdcmaps);
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return 1;
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}
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/* The property exists and is RGB_DEFAULT_MAP */
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for (i=0, s=stdcmaps; (i < count) && (s->visualid != visualid); i++, s++)
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;
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/* No RGB_DEFAULT_MAP property matches the given visualid */
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if (i == count) {
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if (new) {
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XStandardColormap *m, *maps;
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s = (XStandardColormap *) malloc((unsigned) ((count+1) * sizeof
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(XStandardColormap)));
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for (i = 0, m = s, maps = stdcmaps; i < count; i++, m++, maps++) {
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m->colormap = maps->colormap;
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m->red_max = maps->red_max;
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m->red_mult = maps->red_mult;
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m->green_max = maps->green_max;
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m->green_mult = maps->green_mult;
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m->blue_max = maps->blue_max;
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m->blue_mult = maps->blue_mult;
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m->base_pixel = maps->base_pixel;
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m->visualid = maps->visualid;
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m->killid = maps->killid;
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}
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m->colormap = new->colormap;
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m->red_max = new->red_max;
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m->red_mult = new->red_mult;
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m->green_max = new->green_max;
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m->green_mult = new->green_mult;
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m->blue_max = new->blue_max;
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m->blue_mult = new->blue_mult;
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m->base_pixel = new->base_pixel;
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m->visualid = new->visualid;
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m->killid = new->killid;
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XSetRGBColormaps(dpy, win, s, ++count, property);
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free((char *) s);
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}
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XFree((char *) stdcmaps);
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return 0;
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}
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/* Found an RGB_DEFAULT_MAP property with a matching visualid */
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if (replace) {
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/* Free old resources first - we may need them, particularly in
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* the default colormap of the screen. However, because of this,
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* it is possible that we will destroy the old resource and fail
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* to create a new one if XmuStandardColormap() fails.
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*/
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if (count == 1) {
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XmuDeleteStandardColormap(dpy, screen, property);
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if (new)
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XSetRGBColormaps(dpy, win, new, 1, property);
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}
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else {
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XStandardColormap *map;
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/* s still points to the matching standard colormap */
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if (s->killid == ReleaseByFreeingColormap) {
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if ((s->colormap != None) &&
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(s->colormap != DefaultColormap(dpy, screen)))
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XFreeColormap(dpy, s->colormap);
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}
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else if (s->killid != None)
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XKillClient(dpy, s->killid);
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map = (new) ? new : stdcmaps + --count;
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s->colormap = map->colormap;
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s->red_max = map->red_max;
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s->red_mult = map->red_mult;
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s->green_max = map->green_max;
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s->green_mult = map->green_mult;
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s->blue_max = map->blue_max;
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s->blue_mult = map->blue_mult;
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s->visualid = map->visualid;
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s->killid = map->killid;
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XSetRGBColormaps(dpy, win, stdcmaps, count, property);
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}
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}
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XFree((char *) stdcmaps);
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return 1;
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}
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