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#!/usr/bin/perl
# Overwrite a bunch of randomly chosen windows on the screen with
# random-colored rectangles. You might want to learn about the
# "xrefresh" program before trying this one.
# Demonstrates the use of "robust_req"
use X11::Protocol;
$X = X11::Protocol->new;
my $gc = $X->new_rsrc;
$X->req('CreateGC', $gc, $X->root);
for (1 .. 2500) {
my $client = rand(50);
my $client_id = rand(200);
my $id = $client << 21 | $client_id;
printf "XID %x ", $id;
my($result,) = $X->robust_req('GetGeometry', $id);
my %geom;
if (ref $result) {
print "exists\n";
%geom = @$result;
} else {
print "does not exist\n";
next;
}
# Make sure we've got a Window rather than a Pixmap, since overwriting
# Pixmaps is more permanent and therefore less amusing.
next unless ref $X->robust_req('GetWindowAttributes', $id);
$X->req('ChangeGC', $gc, 'foreground' => rand(2**32));
my($result,) = $X->robust_req('PolyFillRectangle', $id, $gc,
[5, 5, $geom{width}-10, $geom{height}-10]);
if (not ref $result) {
print "Ignoring $result error\n";
}
}
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