x11vnc: -rawfb, -pipeinput, -xtrap, -flag, ...

1 files changed, 112 insertions, 0 deletions

diff --git a/x11vnc/misc/slide.pl b/x11vnc/misc/slide.pl
new file mode 100755
index 0000000..0c90d0e
--- /dev/null
+++ b/x11vnc/misc/slide.pl
@@ -0,0 +1,112 @@
+  #!/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";