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fbterm

NAME

FbTerm - a fast FrameBuffer based TERMinal emulator for linux

SYNOPSIS

fbterm [OPTION]

DESCRIPTION

FbTerm is a fast terminal emulator for linux with frame buffer device. Features include:
  
  * mostly as fast as terminal of linux kernel while accelerated scrolling is enabled on framebuffer device
  * select font with fontconfig and draw text with freetype2, same as Qt/Gtk+ based GUI apps
  * dynamicly create/destroy up to 10 windows initially running default shell
  * record scrollback history for every window
  * auto-detect current locale and convert text encoding, support double width scripts like Chinese, Japanese etc
  * switch between configurable additional text encodings with hot keys on the fly
  * copy/past selected text between windows with mouse when gpm server is running
  * change the orientation of screen display, a.k.a. screen rotation
  * lightweight input method framework with client-server architecture

OPTIONS

FbTerm first uses option value specified in command line arguments, then in the configure file $HOME/.fbtermrc. If that file dosn't exist, FbTerm will create it with default options on startup.

-V, --version

display FbTerm version and exit.

-h, --help

display the help and exit.

-n, --font-names=text

specify font family names

-s, -font-size=num

specify font pixel size

-f, --color-foreground=num

speicfy foreground color

-b, --color-background=num

specify background color

-e, --text-encodings=text

specify additional text encodings

-r, --screen-rotate=num

specify the orientation of screen display

-i, --input-method=text

sepcify input method program

--cursor-shape=num

specify default cursor shape

--cursor-interval=num

specify cursor flash interval

see comments in $HOME/.fbtermrc for details of these options.

SHORTCUT SUMMAY

keyboard:
  CTRL_ALT_E:    exit from FbTerm
  CTRL_ALT_C:    create a new window
  CTRL_ALT_D:    destroy current window
  CTRL_ALT_1:    switch to window 1
  CTRL_ALT_2:    switch to window 2
  CTRL_ALT_3:    switch to window 3
  CTRL_ALT_4:    switch to window 4
  CTRL_ALT_5:    switch to window 5
  CTRL_ALT_6:    switch to window 6
  CTRL_ALT_7:    switch to window 7
  CTRL_ALT_8:    switch to window 8
  CTRL_ALT_9:    switch to window 9
  CTRL_ALT_0:    switch to window 10
  SHIFT_LEFT:    switch to previous window
  SHIFT_RIGHT:   switch to next window
  SHIFT_PAGEUP:    history scroll up
  SHIFT_PAGEDOWN:  history scroll down
  CTRL_ALT_F1:                 switch to encoding of current locale
  CTRL_ALT_F2 to CTRL_ALT_F6:  switch to additional encodings
  CTRL_SPACE:    toggle input method

mouse:
  move when left button down:      select text
  double click with left button:   auto select text
  click with right button:         paste selected text

Sometimes above actions will not work, please try to redo them with shift key holding down.

PERFORMANCE

According test result, FbTerm spends more than 95% time on painting screen. Speedup painting will significantly increase performance. Here are some suggestions:

  * Enable fast scrolling on frame buffer device. The visible screen will be just a window of the video memory, when scrolling, FbTerm only change the start of window, no need to repaint the whole screen.
    
  * On Intel P6 family processors the Memory Type Range Registers (MTRRs) may be used to control processor access to memory ranges. If you have video card on a PCI or AGP bus, enabling write-combining allows bus write transfers to be combined into a larger transfer before bursting over the PCI/AGP bus. This can increase performance of FbTerm's paint operations.

Maybe you need to enable them manually for your video card. For example, defaultly fast scrolling and write-combining are all disabled on general VESA frame buffer device, GRUB/LILO configure file should be modified to enable them. A GRUB example is showed below:

--Before--
title Ubuntu
    root (hd0,0)
    kernel /boot/vmlinuz ro root=LABEL=UBUNTU splash vga=0x317
    initrd /boot/initrd.img

--After--
title Ubuntu
    root (hd0,0)
    kernel /boot/vmlinuz ro root=LABEL=UBUNTU splash vga=0x317 video=vesafb:ywrap,mtrr:3
    initrd /boot/initrd.img

AUTHOR

Written by dragchan.

REPORTING BUGS

Report bugs to dragchan <zgchan317@gmail.com>.

COPYRIGHT

Copyright © 2008 dragchan. License GPLv2: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.