display-file(7)
NAME
display-file - Render display into image file
SYNOPSIS
display-file: [-flushcmd=<command>] [-flushframe=<n>]
[-flushtime=<t>] <filename>
DESCRIPTION
- Renders an image into a file. The file can be a framebuffer device
(e.g. /dev/fb0), in which case a reasonable representation of the image
will be drawn on the console so long as the program's mode matches the
framebuffer's mode.
- Note: This target generates no input. The display-multi(7) target can be used in order to see (and control) what the program does (using a normal target) and then generate a snapshot when the program exits.
OPTIONS
filename is the file to render the images to. If the filename is a PPM
file (has the extension .ppm), then the image will be generated at ggiClose(3) time. Otherwise the file is a custom GGIFILE format and is
generated continuously.
The display-file target can be used to generate movies from running
LibGGI applications. To do this, set -flushcmd to a shell command to
execute at the times given by one of the two other parameters. This
looks typically like:
ppmtogif foo.ppm > foo.%04d.gif
The command is passed through a printf(3) which has the current count
of saved frames as an argument (or rather as 10 arguments to allow a
few more complex commands).
This shell command is either executed at every n-th invocation of ggiFlush or every t seconds, where t can have fractional components (specified as decimal).
Note, that the invocation of the shell command will slow down the program, so make sure you use a reasonable value, if you use the -flushtime argument.
The primary file is updated before every invocation of the shell command.
FEATURES
o DirectBuffer always available.
- o Unaccelerated.