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PIX-FB(1)			    BRL-CAD			     PIX-FB(1)

NAME
       pix-fb -	display	a pix format RGB image file on a framebuffer

SYNOPSIS
       pix-fb [-aicz1] [-F framebuffer]	[-m #lines] [-s	squarefilesize]
	      [-w file_width] [-n file_height] [-S squarescrsize]
	      [-W scr_width] [-N scr_height] [-x file_xoff] [-y	file_yoff]
	      [-X scr_xoff] [-Y	scr_yoff] [-p seconds] [file.pix]

DESCRIPTION
       pix-fb reads a pix(5) format file from the named	file, or from standard
       input if	no file	is specified, and displays the image on	the currently
       selected	framebuffer. The environment variable FB_FILE specifies	the
       current framebuffer, see	brlcad(1). Alternatively, the framebuffer may
       be explicitly specified by using	the -F flag.

       By default, the pix file	(and, automatically, the requested framebuffer
       size) is	assumed	to be 512x512 pixels. Specifying the -a	flag causes
       the program to attempt to autosize. A table of common image sizes is
       consulted, and if any match the size of the input file, then the	width
       and height values associated with that size will	be used.

       If the -i flag is specified, the	image is output	from top to bottom.
       Customarily, pix	files are stored bottom	to top,	so this	flag inverts
       the image.

       The -c flag causes the screen to	be cleared before the image is
       displayed. The default behavior is to overwrite the current image with
       the new image without clearing the screen.

       The -z flag will	zoom and center	on the image being displayed to	make
       it fill the display area, using the libfb fb_zoom() routine. fb_zoom
       only offers integer zoom	factors, so displays with non-square screens
       (such as	the SGI	3D machines) may find this option of limited
       usefulness.

       The -w file_width flag specifies	the width of each scanline in the
       input file, in pixels. The -n file_height flag specifies	the height in
       scanlines of the	input file. Both are set to to the same	value via -s
       squarefilesize. (-W scr_width, -N scr_height, and -S squarescrsize
       perform these roles for the display device; if none of these three
       options are used, the display device uses the dimensions	of the input
       file.)

       -x file_xoff -y file_yoff and -X	scr_xoff -Y scr_yoff will offset into
       the file	or onto	the screen by the given	amounts. The coordinate	system
       for these offsets is first quadrant, with the origin at the lower left
       corner of the image.

       The -1 flag causes the image to be written to the framebuffer one line
       at a time, using	the fb_write(3)	routine. This is the default behavior.
       The -m #lines flag can be used to specify the number of lines to	be
       written to the framebuffer in rectangular blocks	of scanlines, using
       the fb_writerect(3) routine. In some circumstances, this	can result in
       significantly faster image display, at the expense of the image being
       written less smoothly. If both -m and -1	are specified, -1 wins.

       The -p flag specifies the (integer) number of seconds to	pause before
       the frame-buffer	is closed.

FORMAT
       A pix(5)	file contains sequences	of pixels. Each	pixel is stored	as
       three unsigned chars, first red,	then green, then blue. The first pixel
       in a pix	file is	the lower left corner of the image. The	pixels proceed
       from left-to-right across each scanline,	with scanlines being written
       from the	bottom to the top of the image.	By convention, pix images are
       usually square.

SEE ALSO
       rt(1), fb-pix(1), libfb(3), pix(5)

DIAGNOSTICS
       If the pix file is shorter than expected, the program exits silently.

AUTHOR
       BRL-CAD Team

COPYRIGHT
       This software is	Copyright (c) 1986-2019	by the United States
       Government as represented by U.S. Army Research Laboratory.

BUG REPORTS
       Reports of bugs or problems should be submitted via electronic mail to
       devs@brlcad.org

BRL-CAD				  08/29/2020			     PIX-FB(1)

NAME | SYNOPSIS | DESCRIPTION | FORMAT | SEE ALSO | DIAGNOSTICS | AUTHOR | COPYRIGHT | BUG REPORTS

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