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/*
* util32.c --
*
* Miscellaneous functions that deal with 32 bit color displays.
*
*/
extern int matched_depth;
/*
* Copyright (c) 1995 The Regents of the University of California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "video.h"
#include "proto.h"
/*
*--------------------------------------------------------------
*
* FindFullColorVisual
*
* Returns a pointer to a full color bit visual on the display
*
* Results:
* See above.
*
* Side effects:
* Unknown.
*
*--------------------------------------------------------------
*/
Visual *
FindFullColorVisual (dpy, depth)
Display *dpy;
int *depth;
{
XVisualInfo vinfo;
XVisualInfo *vinfo_ret;
int numitems, maxdepth;
vinfo.class = TrueColor;
vinfo_ret = XGetVisualInfo(dpy, VisualClassMask, &vinfo, &numitems);
if (numitems == 0) return NULL;
maxdepth = 0;
while(numitems > 0) {
if (vinfo_ret[numitems-1].depth > maxdepth) {
maxdepth = vinfo_ret[numitems-1 ].depth;
}
numitems--;
}
XFree(vinfo_ret);
if (maxdepth < 16) return NULL;
if (XMatchVisualInfo(dpy, DefaultScreen(dpy), maxdepth,
TrueColor, &vinfo)) {
*depth = maxdepth;
return vinfo.visual;
}
return NULL;
}
/*
*--------------------------------------------------------------
*
* CreateFullColorWindow
*
* Creates a window capable of handling 32 bit color.
*
* Results:
* See above.
*
* Side effects:
* Unknown.
*
*--------------------------------------------------------------
*/
Window
CreateFullColorWindow (dpy, x, y, w, h)
Display *dpy;
int x, y;
unsigned int w, h;
{
int depth;
Visual *visual;
XSetWindowAttributes xswa;
unsigned int mask;
unsigned int class;
int screen;
screen = XDefaultScreen(dpy);
class = InputOutput; /* Could be InputOnly */
visual = FindFullColorVisual (dpy, &depth);
matched_depth = depth;
if(matched_depth == 24) matched_depth = 32;
if (visual == NULL) {
return 0;
}
mask = CWBackPixel | CWColormap | CWBorderPixel;
xswa.colormap = XCreateColormap(dpy, XRootWindow(dpy, screen),
visual, AllocNone);
xswa.background_pixel = BlackPixel(dpy, DefaultScreen(dpy));
xswa.border_pixel = WhitePixel(dpy, DefaultScreen(dpy));
return XCreateWindow(dpy, RootWindow(dpy, screen), x, y, w, h,
1, depth, class, visual, mask, &xswa);
}
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