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+.\" $Xorg: XdbeGetV.man,v 1.3 2000/08/17 19:41:55 cpqbld Exp $
+.\"
+.\" Copyright (c) 1995  Hewlett-Packard Company
+.\" 
+.\" Permission is hereby granted, free of charge, to any person obtaining a
+.\" copy of this software and associated documentation files (the "Software"), 
+.\" to deal in the Software without restriction, including without limitation 
+.\" the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+.\" and/or sell copies of the Software, and to permit persons to whom the 
+.\" Software furnished to do so, subject to the following conditions:
+.\" 
+.\" 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 
+.\" HEWLETT-PACKARD COMPANY 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 Hewlett-Packard Company shall not 
+.\" be used in advertising or otherwise to promote the sale, use or other 
+.\" dealing in this Software without prior written authorization from the 
+.\" Hewlett-Packard Company.
+.\"
+.\" $XFree86: xc/doc/man/Xext/dbe/XdbeGetV.man,v 3.5 2001/02/07 22:35:22 tsi Exp $
+.\"
+.TH XdbeGetVisualInfo __libmansuffix__ __xorgversion__ "X FUNCTIONS"
+.SH NAME
+XdbeGetVisualInfo - Get dbe Visual Informations
+.SH SYNOPSIS
+\&#include <X11/extensions/Xdbe.h>
+
+XdbeScreenVisualInfo *XdbeGetVisualInfo(
+    Display  *dpy,
+    Drawable *screen_specifiers,
+    int      *num_screens)
+.SH DESCRIPTION
+This function returns information about which visuals support double
+buffering.  The argument
+.I num_screens
+specifies how many elements there are 
+in the
+.I screen_specifiers
+list.  Each drawable in
+.I screen_specifiers
+designates a 
+screen for which the supported visuals are being requested.  If
+.I num_screens
+is zero, information for all screens is requested.  In this case, upon return
+from this function,
+.I num_screens
+will be set to the number of screens that were
+found.  If an error occurs, this function returns NULL, else it returns a
+pointer to a list of
+.I XdbeScreenVisualInfo
+structures of length
+.I num_screens.
+The nth
+element in the returned list corresponds to the nth drawable in the 
+.I screen_specifiers
+list, unless
+.I num_screens
+was passed in with the value zero,
+in which case the nth element in the returned list corresponds to the nth screen
+of the server, starting with screen zero.  The
+.I XdbeScreenVisualInfo
+structure has the following fields:
+
+     int            count
+     XdbeVisualInfo *visinfo
+
+.I count
+specifies the number of items in
+.I visinfo.
+.I visinfo
+specifies a list of visuals, depths, and performance hints for this screen.
+
+The
+.I XdbeVisualInfo
+structure has the following fields:
+
+     VisualID visual
+     int      depth
+     int      perflevel
+
+.I visual
+specifies one visual ID that supports double-buffering.
+.I depth
+specifies the depth of the visual.
+.I perflevel
+is a performance hint.
+
+The only operation defined on a
+.I perflevel
+is comparison to a
+.I perflevel
+of another visual on the same screen.  The visual having the higher
+.I perflevel
+is likely to have better double-buffering graphics performance than the visual
+having the lower
+.I perflevel.
+Nothing can be deduced from the following: the magnitude of the difference
+of two
+.I perflevels,
+a
+.I perflevel
+value in isolation, or comparing
+.I perflevels
+from different servers.
+
+.SH ERRORS
+.IP BadDrawable
+One or more values passed in
+.I screen_specifiers
+is not a valid drawable.
+.SH SEE ALSO
+DBE,
+.I XdbeAllocateBackBufferName(),
+.I XdbeBeginIdiom(),
+.I XdbeDeallocateBackBufferName(),
+.I XdbeEndIdiom(),
+.I XdbeFreeVisualInfo(),
+.I XdbeGetBackBufferAttributes(),
+.I XdbeQueryExtension(),
+.I XdbeSwapBuffers().
+