#!/usr/bin/perl -w
-# Copyright © 2003 Jamie Zawinski <jwz@jwz.org>.
+# Copyright © 2003-2013 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: 1.1 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
+my $version = q{ $Revision: 1.6 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
my @grabber = ("screencapture", "-x");
my @converter = ("pdf2jpeg");
my $verbose = 0;
-my $use_stdout_p = 0;
-my $return_filename_p = 0;
-sub error {
+sub error($) {
($_) = @_;
print STDERR "$progname: $_\n";
exit 1;
# returns the full path of the named program, or undef.
#
-sub which {
+sub which($) {
my ($prog) = @_;
foreach (split (/:/, $ENV{PATH})) {
if (-x "$_/$prog") {
return undef;
}
-sub check_path {
+sub check_path() {
my $ok = 1;
foreach ($grabber[0], $converter[0]) {
if (! which ($_)) {
}
-sub grab_image {
+sub grab_image() {
check_path();
my $tmpdir = $ENV{TMPDIR};
$tmpdir = "/tmp" unless $tmpdir;
- my $tmpfile = "$tmpdir/xssgrab.$$.pdf";
+ my $tmpfile = sprintf ("%s/xssgrab.%08x.pdf", $tmpdir, rand(0xffffffff));
my @cmd = (@grabber, $tmpfile);
unlink $tmpfile;
print STDERR "$progname: executing \"" . join(' ', @cmd) . "\"\n"
if ($verbose);
- system (@cmd);
+ system (join(' ', @cmd) . ' 2>/dev/null');
my @st = stat($tmpfile);
my $size = (@st ? $st[7] : 0);
}
}
- # 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;
+ open (my $in, '<:raw', $tmpfile) || error ("$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) {
}
}
- if ($return_filename_p) {
- print STDERR "$progname: wrote \"$tmpfile\"\n" if ($verbose);
- print STDOUT "$tmpfile\n";
-
- } elsif ($use_stdout_p) {
- local *IN;
- my $ppm = "";
- my $reader = "djpeg $tmpfile";
- $reader .= " 2>/dev/null" if ($verbose <= 1);
- $reader .= " |";
-
- open(IN, $reader) || error "reading $tmpfile: $!";
- print STDERR "$progname: reading $tmpfile\n" if ($verbose > 1);
- while (<IN>) { $ppm .= $_; }
- close IN;
- unlink $tmpfile;
- print STDOUT $ppm;
-
- } else {
-
- @cmd = ("xscreensaver-getimage-file");
- push @cmd, "--verbose" if ($verbose);
- push @cmd, $tmpfile;
-
- print STDERR "$progname: executing \"" . join(' ', @cmd) . "\"\n"
- if ($verbose);
- system (@cmd);
-
- unlink $tmpfile;
- }
+ print STDERR "$progname: wrote \"$tmpfile\"\n" if ($verbose);
+ print STDOUT "$tmpfile\n";
}
-sub usage {
- print STDERR "usage: $progname [--verbose] [--name | --stdout]\n";
+sub usage() {
+ print STDERR "usage: $progname [--verbose]\n";
exit 1;
}
-sub main {
+sub main() {
while ($_ = $ARGV[0]) {
shift @ARGV;
- if ($_ eq "--verbose") { $verbose++; }
- elsif (m/^-v+$/) { $verbose += length($_)-1; }
- elsif (m/^--?stdout$/) { $use_stdout_p = 1; }
- elsif (m/^--?name$/) { $return_filename_p = 1; }
- elsif (m/^-./) { usage; }
- else { usage; }
+ if (m/^--?verbose$/s) { $verbose++; }
+ elsif (m/^-v+$/s) { $verbose += length($_)-1; }
+ elsif (m/^--?name$/s) { } # ignored, for compatibility
+ elsif (m/^-./) { usage; }
+ else { usage; }
}
-
grab_image();
}
projects / xscreensaver / blobdiff