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