#!/usr/bin/perl -w
-# Copyright © 2003 Jamie Zawinski <jwz@jwz.org>.
+# Copyright © 2003-2005 Jamie Zawinski <jwz@jwz.org>.
#
# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# software for any purpose. It is provided "as is" without express or
# implied warranty.
#
-# This program attempts to grab an image of the desktop, and then load
-# it on to the root window using the "xscreensaver-getimage-file"
-# program. Various frame-grabbing programs are known, and the first
-# one found is used.
#
-# NOTE: This script is only used on MacOS X / XDarwin systems, because
-# on those systems, it's necessary to use the "screencapture"
-# program to get an image of the desktop -- the usual X11
-# mechanism for grabbing the screen doesn't work on OSX.
+# This script is invoked by "xscreensaver-getimage" on X11 MacOS systems
+# to grab an image of the desktop, and then load it on to the given X11
+# Drawable using the "xscreensaver-getimage-file" program.
#
-# The various xscreensaver hacks that manipulate images ("slidescreen",
-# "jigsaw", etc.) get the image to manipulate by running the
-# "xscreensaver-getimage" program.
+# This script is only used in an *X11* build on MacOS systems.
#
-# "xscreensaver-getimage" will invoke this program, depending on the
-# value of the "grabDesktopImages" setting in the ~/.xscreensaver file
-# (or in /usr/lib/X11/app-defaults/XScreenSaver).
+# When running on non-Mac X11 systems, utils/grabscreen.c is used.
+#
+# However, when running under X11 on MacOS, that usual X11-based
+# screen-grabbing mechanism doesn't work, so we need to invoke the
+# "/usr/bin/screencapture" program to do it instead. (This script).
+#
+# However again, for the MacOS-native (Cocoa) build of the screen savers,
+# "utils/grabclient.c" instead links against "OSX/osxgrabscreen.m", which
+# grabs screen images directly without invoking a sub-process to do it.
#
# Created: 20-Oct-2003.
+
require 5;
-use diagnostics;
+#use diagnostics; # Fails on some MacOS 10.5 systems
use strict;
my $progname = $0; $progname =~ s@.*/@@g;
-my $version = q{ $Revision: 1.2 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
+my $version = q{ $Revision: 1.5 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
my @grabber = ("screencapture", "-x");
my @converter = ("pdf2jpeg");
}
}
- # Convert the PDF to a JPEG
+ # On MacOS 10.3, "screencapture -x" always wrote a PDF.
+ # On 10.4.2, it writes a PNG by default, and the output format can be
+ # changed with the new "-t" argument.
+ #
+ # So, for maximal compatibility, we run it without "-t", but look at
+ # the first few bytes to see if it's a PDF, and if it is, convert it
+ # to a JPEG first. Otherwise, we assume that whatever screencapture
+ # wrote is a file format that xscreensaver-getimage-file can already
+ # cope with (though it will have the extension ".pdf", regardless of
+ # what is actually in the file).
+ #
+ my $pdf_p = 0;
{
- my $jpgfile = $tmpfile;
- $jpgfile =~ s/\.[^.]+$//;
- $jpgfile .= ".jpg";
-
- @cmd = (@converter, $tmpfile, $jpgfile);
- push @cmd, "--verbose" if ($verbose);
-
- print STDERR "$progname: executing \"" . join(' ', @cmd) . "\"\n"
- if ($verbose);
- system (@cmd);
- unlink $tmpfile;
- $tmpfile = $jpgfile;
+ local *IN;
+ open (IN, "<$tmpfile") || error ("$tmpfile: $!");
+ my $buf = '';
+ read (IN, $buf, 10);
+ close IN;
+ $pdf_p = ($buf =~ m/^%PDF-/s);
}
+ # If it's a PDF, convert it to a JPEG.
+ #
+ if ($pdf_p)
+ {
+ my $jpgfile = $tmpfile;
+ $jpgfile =~ s/\.[^.]+$//;
+ $jpgfile .= ".jpg";
+
+ @cmd = (@converter, $tmpfile, $jpgfile);
+ push @cmd, "--verbose" if ($verbose);
+
+ print STDERR "$progname: executing \"" . join(' ', @cmd) . "\"\n"
+ if ($verbose);
+ system (@cmd);
+ unlink $tmpfile;
+ $tmpfile = $jpgfile;
+ }
+
@st = stat($tmpfile);
$size = (@st ? $st[7] : 0);
if ($size <= 2048) {