MirOS Manual: Xvfb(1)


XVFB(1)             UNIX Programmer's Manual              XVFB(1)

NAME

     Xvfb - virtual framebuffer X server for X Version 11

SYNOPSIS

     Xvfb [ option ] ...

DESCRIPTION

     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.

     The primary use of this server was intended to be server
     testing.  The mfb or cfb 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 Xvfb, including testing clients against
     unusual depths and screen configurations, doing batch pro-
     cessing with Xvfb as a background rendering engine, load
     testing, as an aid to porting the X server to a new plat-
     form, and providing an unobtrusive way to run applications
     that don't really need an X server but insist on having one
     anyway.

BUILDING

     To build Xvfb, put the following in your host.def and
     remake.

     #define BuildServer YES /* if you aren't already building
     other servers */
     #define XVirtualFramebufferServer YES

OPTIONS

     In addition to the normal server options described in the
     Xserver(1) manual page, Xvfb accepts the following command
     line switches:

     -screen screennum WxHxD[@x,y]
         This option creates screen screennum and sets its width,
         height, and depth to W, H, and D respectively, and
         optionally the screen origin (for Xinerama purposes) to
         (x,y).  By default, only screen 0 exists and has the
         dimensions 1280x1024x8.  If a screen origin is not
         specified when using Xinerama, the default is for screen
         N to be positioned to the right of screen N-1.

     -pixdepths list-of-depths
         This option specifies a list of pixmap depths that the
         server should support in addition to the depths implied
         by the supported screens. list-of-depths is a space-
         separated list of integers that can have values from 1
         to 32.

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XVFB(1)             UNIX Programmer's Manual              XVFB(1)

     -fbdir framebuffer-directory
         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.

     -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.

     If neither -shmem nor -fbdir is specified, the framebuffer
     memory will be allocated with malloc().

     -linebias n
         This option specifies how to adjust the pixelization of
         thin lines. The value n 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 cfb and mfb code.

     -blackpixel pixel-value, -whitepixel pixel-value
         These options specify the black and white pixel values
         the server should use.

FILES

     The following files are created if the -fbdir option is
     given.

     framebuffer-directory/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.

EXAMPLES

     Xvfb :1 -screen 0 1600x1200x32
             The server will listen for connections as server
             number 1, and screen 0 will be depth 32 1600x1200.

     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.

     Xvfb -pixdepths 3 27 -fbdir /usr/tmp

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XVFB(1)             UNIX Programmer's Manual              XVFB(1)

             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 /usr/tmp for the framebuffer.

     xwud -in /usr/tmp/Xvfb_screen0
             Displays screen 0 of the server started by the
             preceding example.

SEE ALSO

     X(7), Xserver(1), xwd(1), xwud(1), XWDFile.h

AUTHORS

     David P. Wiggins, The Open Group, Inc.

XFree86                   Version 4.5.0                         3

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