12 my $numre = Imager::Expr->numre;
13 while (defined(my $arg = shift)) {
16 my $work = shift or die "$0: argument missing for -g\n";
17 if ($work =~ /^(\d+)x(\d+)?$/) {
19 $opts{height} = $2 if defined $2;
21 elsif ($work =~ /^x(\d+)$/) {
25 die "$0: invalid geometry supplied to -g\n";
28 elsif ($arg eq '-f') {
29 $func = shift or die "$0: argument missing for -f\n";
30 $expr = Imager::Transform->new($func)
31 or die "$0: unknown transformation $func\n";
33 elsif ($arg eq '-d') {
34 my $func = shift or die "$0: argument missing for -d\n";
35 my $desc = Imager::Transform->describe($func)
36 or die "$0: unknown transformation $func\n";
40 elsif ($arg eq '-l') {
41 print join("\n", sort Imager::Transform->list),"\n";
44 elsif ($arg eq '-o') {
45 $out = shift or die "$0: argument missing for -o\n";
47 elsif ($arg eq '--') {
52 die "$0: Unknown option $arg\n";
56 if ($arg =~ /^([^\W\d]\w*)=($numre)$/) {
58 and die "$0: constant $1 already defined\n";
69 or die "$0: not enough input images specified for $func\n";
72 my $im = Imager->new();
74 or die "Cannot read $in: ",$im->errstr,"\n";
78 defined $out or $out = $func.".jpg";
80 $opts{jpegquality} = 100;
81 my $im = $expr->transform(\%opts, \%con, @in)
82 or die "$0: error transforming: ",$expr->errstr,"\n";
84 $im->write(file=>$out, jpegquality=>100)
85 or die "0: Cannot write $out: ",$im->errstr,"\n";
90 Usage: $0 -f <func> <constant>=<value> ... <input-image>...
93 -f <func> - function to evaluate
94 -l - list function names
95 -d <func> - describe <func>
96 -g <digits>x<digits> - dimensions of output image
97 -o <file> - output file