TH 9V 9.1
SH NAME
9v, save, flip \- copy picture files to and from screen
SH SYNOPSIS
B fb/9v
[
B -mMq
] [
B
-w
I x0 y0 x1 y1
] [
B -c
I cenx ceny
] [
I input
]
PP
B fb/save
PP
B fb/flip
[
B -r
I fps
]
[
B -p
]
p1 p2 ...
SH DESCRIPTION
I 9v
displays its argument picture file (default standard input) in a new window in the middle of an
B 8½
screen.  In addition to the native
IR picfile (9.6)
format, it tries to read images of many foreign encodings.
(It guesses which encoding based on the file's name, recognizing suffixes
BR .gif ,
BR .jpg ,
BR .jpeg ,
BR .ega ,
BR .face ,
BR .pcx ,
BR .sgi ,
BR .tga ,
BR .tif ,
BR .tiff ,
BR .rle ,
and
BR .xbm .
For a program
that guesses based on the file's contents, see
IR cvt2pic (9.1).)
On an 8-bit display, it loads an 8-bit image's color map if it contains one.
Otherwise (if the display is fewer than 8 bits per pixel, or the image is not 8-bit
color-mapped) it computes the image's luminance, dithered appropriately for the
available grey shades.
PP
In the
I 9v
window button 1 displays pixel coordinates and values at the top of the window
and button 3 pops up a menu.  The
B "fix cmap
menu item reloads the color map, in the event that some other program has
stepped on it.  The
B exit
button exits after confirmation.
PP
The
B -c
flag specifies the window's center coordinates, overriding the default.
The
B -w
flag specifies the window's minimum and maximum
I x
and
I y
coordinates.
Flag
B -m
suppresses default loading the color map of images containing one.
B -M
causes
I 9v
to load an image's color map and exit immediately.
B -q
makes
I 9v
exit on receiving any mouse or keyboard event.
PP
I Save
writes a picture file containing its window (or screen if
B 8½
is not running)
onto its standard output.
PP
I Flip
displays many picture files in sequence in a loop.  The pictures must be
the same size, and must fit in memory.
The pictures are all loaded into main memory and then sent to the display
as required using
B wrbitmap
(see
IR balloc (2)),
so the machine running
I flip
can be remote; a CPU server
can be used if there are many large frames.
The
B -r
option sets the display rate in frames per second.  By default
I flip
displays as fast as it can:
about 15 frames per second for a small picture on a Magnum.
The
B -p
flag causes a one-second pause at the end of the loop.
SH SOURCE
B /sys/src/fb/9v.c
br
B /sys/src/fb/save.c
br
B /sys/src/fb/flip.c
SH BUGS
I 9v
guesses the format of foreign images by looking at
the filename, not its contents.
SH "SEE ALSO
IR picfile (9.6)

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