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findargb.c

/*
 * $Id: findargb.c,v 1.1 2003/12/02 03:04:47 keithp Exp $
 *
 * Copyright © 2003 Keith Packard
 *
 * 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, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include "findargb.h"

Visual *
find_argb_visual (Display *dpy, int scr)
{
    XVisualInfo         *xvi;
    XVisualInfo         template;
    int                 nvi;
    int                 i;
    XRenderPictFormat   *format;
    Visual        *visual;

    template.screen = scr;
    template.depth = 32;
    template.class = TrueColor;
    xvi = XGetVisualInfo (dpy, 
                    VisualScreenMask |
                    VisualDepthMask |
                    VisualClassMask,
                    &template,
                    &nvi);
    if (!xvi)
      return 0;
    visual = 0;
    for (i = 0; i < nvi; i++)
    {
      format = XRenderFindVisualFormat (dpy, xvi[i].visual);
      if (format->type == PictTypeDirect && format->direct.alphaMask)
      {
          visual = xvi[i].visual;
          break;
      }
    }

    XFree (xvi);
    return visual;
}

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