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