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screensaver ()
  • >> screensaver (4) ( FreeBSD man: Специальные файлы /dev/* )

  • BSD mandoc
     

    NAME

    
    
    splash
    
     - splash screen / screen saver interface
    
     
    

    SYNOPSIS

    device splash  

    DESCRIPTION

    The pseudo device driver adds support for the splash screen and screen savers to the kernel. This driver is required if the splash bitmap image is to be loaded or any screen saver is to be used.  

    Splash screen

    You can load and display an arbitrary bitmap image file as a welcome banner on the screen when the system is about to start. This image will remain on the screen during kernel initialization process until the login prompt appears on the screen or until a screen saver is loaded and initialized. The image will also disappear if you hit any key, although this may not work immediately if the kernel is still probing devices.

    If you specify the -c or -v boot option when loading the kernel, the splash image will not appear. However, it is still loaded and can be used as a screen saver later: see below.

    In order to display the bitmap, the bitmap file itself and the matching splash image decoder module must be loaded by the boot loader. Currently the following decoder modules are available:

    splash_bmp.ko
    W*ndows BMP file decoder. While the BMP file format allows images of various color depths, this decoder currently only handles 256 color bitmaps. Bitmaps of other color depths will not be displayed.
    splash_pcx.ko
    ZSoft PCX decoder. This decoder currently only supports version 5 8-bpp single-plane images.

    The Sx EXAMPLES section illustrates how to set up the splash screen.

    If the standard VGA video mode is used, the size of the bitmap must be 320x200 or less. If you enable the VESA mode support in the kernel, either by statically linking the VESA module or by loading the VESA module (see vga(4)), you can load bitmaps up to a resolution of 1024x768, depending on the VESA BIOS and the amount of video memory on the video card.  

    Screen saver

    The screen saver will activate when the system is considered idle: i.e. when the user has not typed a key or moved the mouse for a specified period of time. As the screen saver is an optional module, it must be explicitly loaded into memory. Currently the following screen saver modules are available:

    blank_saver.ko
    This screen saver simply blanks the screen.
    daemon_saver.ko
    Animated BSD Daemon screen saver.
    fade_saver.ko
    The screen will gradually fade away.
    fire_saver.ko
    A fire which becomes higher as load increases.
    green_saver.ko
    If the monitor supports power saving mode, it will be turned off.
    logo_saver.ko
    Animated graphical BSD Daemon.
    rain_saver.ko
    Draws a shower on the screen.
    snake_saver.ko
    Draws a snake of string.
    star_saver.ko
    Twinkling stars.
    warp_saver.ko
    Streaking stars.

    Screen saver modules can be loaded using kldload(8):

    kldload logo_saver

    The timeout value in seconds can be specified as follows:

    vidcontrol -t N

    Alternatively, you can set the saver variable in the /etc/rc.conf to the screen saver of your choice and the timeout value to the blanktime variable so that the screen saver is automatically loaded and the timeout value is set when the system starts.

    The screen saver may be instantly activated by hitting the saver key: the defaults are Shift-Pause on the AT enhanced keyboard and Shift-Ctrl-NumLock/Pause on the AT 84 keyboard. You can change the saver key by modifying the keymap (see kbdcontrol(1), keymap(5)), and assign the saver function to a key of your preference.

    The screen saver will not run if the screen is not in text mode.  

    Splash screen as a screen saver

    If you load a splash image but do not load a screen saver, you can continue using the splash module as a screen saver. The screen blanking interval can be specified as described in the Sx Screen saver section above.  

    FILES

    /boot/defaults/loader.conf
    boot loader configuration defaults
    /etc/rc.conf
    system configuration information
    /boot/kernel/splash_*.ko
    splash image decoder modules
    /boot/kernel/*_saver.ko
    screen saver modules
    /boot/kernel/vesa.ko
    the VESA support module

     

    EXAMPLES

    In order to load the splash screen or the screen saver, you must have the following line in the kernel configuration file.

    device splash

    Next, edit /boot/loader.conf (see loader.conf5) and include the following lines:

    splash_bmp_load="YES"
    bitmap_load="YES"
    bitmap_name="/boot/chuck.bmp"
    

    In the above example, the file /boot/chuck.bmp is loaded. In the following example, the VESA module is loaded so that a bitmap file which cannot be displayed in standard VGA modes may be shown using one of the VESA video modes.

    splash_pcx_load="YES"
    vesa_load="YES"
    bitmap_load="YES"
    bitmap_name="/boot/chuck.pcx"
    

    If the VESA support is statically linked to the kernel, it is not necessary to load the VESA module. Just load the bitmap file and the splash decoder module as in the first example above.  

    CAVEATS

    Both the splash screen and the screen saver work with syscons(4) only.  

    SEE ALSO

    vidcontrol(1), syscons(4), vga(4), loader.conf5, rc.conf5, kldload(8), kldunload(8)  

    HISTORY

    The driver first appeared in Fx 3.1 .  

    AUTHORS

    An -nosplit The driver and this manual page were written by An Kazutaka Yokota Aq yokota@FreeBSD.org . The splash_bmp module was written by An Michael Smith Aq msmith@FreeBSD.org and An Kazutaka Yokota . The splash_pcx module was written by An Dag-Erling Sm/orgrav Aq des@FreeBSD.org based on the splash_bmp code.  

    BUGS

    If you load a screen saver while another screen saver has already been loaded, the first screen saver will not be automatically unloaded and will remain in memory, wasting kernel memory space.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    Splash screen
    Screen saver
    Splash screen as a screen saver
    FILES
    EXAMPLES
    CAVEATS
    SEE ALSO
    HISTORY
    AUTHORS
    BUGS


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