xserver pixman mesa git update 19 jan 2011

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+.\" $XdotOrg: xc/programs/Xserver/hw/vfb/Xvfb.man,v 1.3 2005/03/23 20:49:52 gisburn Exp $
+.\" $Xorg: Xvfb.man,v 1.4 2001/02/09 02:04:45 xorgcvs Exp $
+.\" Copyright 1993, 1998  The Open Group
+.\"
+.\" 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.
+.\"
+.\" 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 THE OPEN GROUP 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 Open Group shall
+.\" not be used in advertising or otherwise to promote the sale, use or
+.\" other dealings in this Software without prior written authorization
+.\" from The Open Group.
+.\"
+.\" $XFree86: xc/programs/Xserver/hw/vfb/Xvfb.man,v 1.9 2001/12/14 19:59:45 dawes Exp $
+.\"
+.TH XVFB 1 __xorgversion__
+.SH NAME
+Xvfb \- virtual framebuffer X server for X Version 11
+.SH SYNOPSIS
+.B Xvfb
+[ option ] ...
+.SH DESCRIPTION
+.I Xvfb
+is an X server that can run on machines with no display hardware
+and no physical input devices.  It emulates a dumb framebuffer using
+virtual memory.
+.PP
+The primary use of this server was intended to be server testing.  The
+fb code for any depth can be exercised with this server
+without the need for real hardware that supports the desired depths.
+The X community has found many other novel uses for \fIXvfb\fP,
+including testing clients against unusual depths and screen
+configurations, doing batch processing with \fIXvfb\fP as a background
+rendering engine, load testing, as an aid to porting the X server to a
+new platform, and providing an unobtrusive way to run applications
+that don't really need an X server but insist on having one anyway.
+.SH OPTIONS
+.PP
+In addition to the normal server options described in the \fIXserver(1)\fP
+manual page, \fIXvfb\fP accepts the following command line switches:
+.TP 4
+.B "\-screen \fIscreennum\fP \fIWxHxD\fP"
+This option creates screen \fIscreennum\fP and sets its width, height,
+and depth to W, H, and D respectively.  By default, only screen 0 exists
+and has the dimensions 1280x1024x8.
+.TP 4
+.B "\-pixdepths \fIlist-of-depths\fP"
+This option specifies a list of pixmap depths that the server should
+support in addition to the depths implied by the supported screens.
+\fIlist-of-depths\fP is a space-separated list of integers that can
+have values from 1 to 32.
+.TP 4
+.B "\-fbdir \fIframebuffer-directory\fP"
+This option specifies the directory in which the memory mapped files
+containing the framebuffer memory should be created.
+See FILES.
+This option only exists on machines that have the mmap and msync system
+calls.
+.TP 4
+.B "\-shmem"
+This option specifies that the framebuffer should be put in shared memory.
+The shared memory ID for each screen will be printed by the server.
+The shared memory is in xwd format.
+This option only exists on machines that support the System V shared memory
+interface.
+.PP
+If neither \fB\-shmem\fP nor \fB\-fbdir\fP is specified,
+the framebuffer memory will be allocated with malloc().
+.TP 4
+.B "\-linebias \fIn\fP"
+This option specifies how to adjust the pixelization of thin lines.
+The value \fIn\fP is a bitmask of octants in which to prefer an axial
+step when the Bresenham error term is exactly zero.  See the file
+Xserver/mi/miline.h for more information.  This option is probably only useful
+to server developers to experiment with the range of line pixelization
+possible with the fb code.
+.TP 4
+.B "\-blackpixel \fIpixel-value\fP, \-whitepixel \fIpixel-value\fP"
+These options specify the black and white pixel values the server should use.
+.SH FILES
+The following files are created if the \-fbdir option is given.
+.TP 4
+\fIframebuffer-directory\fP/Xvfb_screen<n>
+Memory mapped file containing screen n's framebuffer memory, one file
+per screen.  The file is in xwd format.  Thus, taking a full-screen
+snapshot can be done with a file copy command, and the resulting
+snapshot will even contain the cursor image.
+.SH EXAMPLES
+.TP 8
+Xvfb :1 -screen 0 1600x1200x32
+The server will listen for connections as server number 1, and screen 0
+will be depth 32 1600x1200.
+.TP 8
+Xvfb :1 -screen 1 1600x1200x16
+The server will listen for connections as server number 1, will have the
+default screen configuration (one screen, 1280x1024x8), and screen 1
+will be depth 16 1600x1200.
+.TP 8
+Xvfb -pixdepths 3 27 -fbdir /var/tmp
+The server will listen for connections as server number 0, will have the
+default screen configuration (one screen, 1280x1024x8),
+will also support pixmap
+depths of 3 and 27,
+and will use memory mapped files in /var/tmp for the framebuffer.
+.TP 8
+xwud -in /var/tmp/Xvfb_screen0
+Displays screen 0 of the server started by the preceding example.
+.SH "SEE ALSO"
+.PP
+X(__miscmansuffix__), Xserver(1), xwd(1), xwud(1), XWDFile.h
+.SH AUTHORS
+David P. Wiggins, The Open Group, Inc.