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#!/bin/sh -- # A comment mentioning perl
eval 'exec perl -S $0 ${1+"$@"}'
if 0;
#
# slide.pl: amusing example slideshow program for use with x11vnc -rawfb mode.
#
# E.g. x11vnc -rawfb map:/tmp/foo@640x480x32:ff/ff00/ff0000 -pipeinput slide.pl
#
# requires: jpegtopnm(1), (maybe LSB too).
#
@jpegs = qw(
dr_fun_new.jpg canon.jpg go_microsoft.jpg jonathan2.jpg
michelle1.jpg novm.jpg photo-008.jpg presrange.jpg
);
# Or:
# @jpegs = @ARGV;
# @jpegs = <*.jpg>;
# this is x11vnc's -rawfb value:
if ($ENV{X11VNC_RAWFB_STR} =~ m,:(.*)@(\d+)x(\d+)x(\d+),) {
$fb = $1; # filename
$W = $2; # width
$H = $3; # height
} else {
die "No usable X11VNC_RAWFB_STR\n";
}
open(FB, ">$fb") || die "$!";
# make a solid background:
$ones = "\377" x ($W * 4);
$grey = "\340" x ($W * 4);
for ($y = 0; $y < $H; $y++) {
print FB $grey;
}
# this is rather slow with many jpegs... oh well.
foreach $pic (@jpegs) {
print STDERR "loading '$pic' please wait ...\n";
open(JPEG, "jpegtopnm '$pic' 2>/dev/null|") || die "$!";
while (<JPEG>) {
next if /^P\d/;
if (/^(\d+)\s+(\d+)\s*$/) {
$Jpeg{$pic}{w} = $1;
$Jpeg{$pic}{h} = $2;
}
last if /^255$/;
}
$data = '';
while (<JPEG>) {
$data .= $_;
}
close(JPEG);
# need to put in a 4th 0 byte after RGB for 32bpp. 24bpp doesn't work.
# (MSB might be other way around).
$new = '';
for ($l = 0; $l < int(length($data)/3); $l++) {
$new .= substr($data, $l * 3, 3) . "\0";
}
$Jpeg{$pic}{data} = $new;
$data = ''; $new = '';
if ($pic eq $jpegs[0]) {
showpic(0);
}
}
$N = scalar(@jpegs);
print STDERR "\nFinished loading $N images. Click Button or Spacebar for next.\n";
$I = 0;
while (<>) {
# read the next user input event, watch for button press or spacebar:
last if /^Keysym.* [qQ] /;
next unless /^(Pointer.*ButtonPress|Keysym.*space.*KeyPress)/;
$I = ($I + 1) % $N;
showpic($I);
}
sub showpic {
my($i) = @_;
my $pic = $jpegs[$i];
my $h = $Jpeg{$pic}{h};
my $w = $Jpeg{$pic}{w};
my $dy = int(($H - $h)/2);
my $dx = int(($W - $w)/2);
print STDERR "showing pic $i: $pic\t$w x $h +$dy+$dx\n";
# clear screen:
seek(FB, 0, 0);
for ($y = 0; $y < $H; $y++) {
print FB $ones;
}
# insert new picture:
for ($y = 0; $y < $h; $y++) {
seek(FB, (($y + $dy) * $W + $dx) * 4, 0);
$line = substr($Jpeg{$pic}{data}, $y * $w * 4, $w * 4);
print FB $line;
}
}
close(FB);
#unlink($fb); # this (probably) won't kill x11vnc
print STDERR "$0 done.\n";
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