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#!perl -w
use strict;
use Imager;
use Imager::Transform;
my %opts;
my @in;
my $expr;
my $func;
my $out;
my %con;
my $numre = Imager::Expr->numre;
while (defined(my $arg = shift)) {
if ($arg =~ /^-/) {
if ($arg eq '-g') {
my $work = shift or die "$0: argument missing for -g\n";
if ($work =~ /^(\d+)x(\d+)?$/) {
$opts{width} = $1;
$opts{height} = $2 if defined $2;
}
elsif ($work =~ /^x(\d+)$/) {
$opts{height} = $2;
}
else {
die "$0: invalid geometry supplied to -g\n";
}
}
elsif ($arg eq '-f') {
$func = shift or die "$0: argument missing for -f\n";
$expr = Imager::Transform->new($func)
or die "$0: unknown transformation $func\n";
}
elsif ($arg eq '-d') {
my $func = shift or die "$0: argument missing for -d\n";
my $desc = Imager::Transform->describe($func)
or die "$0: unknown transformation $func\n";
print $desc;
exit;
}
elsif ($arg eq '-l') {
print join("\n", sort Imager::Transform->list),"\n";
exit;
}
elsif ($arg eq '-o') {
$out = shift or die "$0: argument missing for -o\n";
}
elsif ($arg eq '--') {
push(@in, @ARGV);
last;
}
else {
die "$0: Unknown option $arg\n";
}
}
else {
if ($arg =~ /^([^\W\d]\w*)=($numre)$/) {
exists $con{$1}
and die "$0: constant $1 already defined\n";
$con{$1} = $2;
}
else {
push(@in, $arg);
}
}
}
$expr or usage();
$expr->inputs <= @in
or die "$0: not enough input images specified for $func\n";
for my $in (@in) {
my $im = Imager->new();
$im->read(file=>$in)
or die "Cannot read $in: ",$im->errstr,"\n";
$in = $im;
}
defined $out or $out = $func.".jpg";
$opts{jpegquality} = 100;
my $im = $expr->transform(\%opts, \%con, @in)
or die "$0: error transforming: ",$expr->errstr,"\n";
$im->write(file=>$out, jpegquality=>100)
or die "0: Cannot write $out: ",$im->errstr,"\n";
sub usage {
print <<EOS;
Usage: $0 -f <func> <constant>=<value> ... <input-image>...
$0 -l
$0 -d <func>
-f <func> - function to evaluate
-l - list function names
-d <func> - describe <func>
-g <digits>x<digits> - dimensions of output image
-o <file> - output file
EOS
exit
}
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