compensate for known terminal aspect ratio

Instead of assuming oldschool/high fonts, calculate from window resolution
and characters, supported by many terminals (at least urxvt, xterm, mlterm,
stterm, putty).

Depend on Term::ReadKey instead of calling a linux-specific ioctl, since
it's commonly installed already and obviously better for compatibility.

diff --git a/termimg b/termimg
index 40bf6abfdca284ff75523d4f9e3329fb7649d8c2..687615839dcb47f3773698d1b876ef0205f52a40 100755 (executable)
--- a/termimg
+++ b/termimg
@@ -54,10 +54,16 @@ eval {
        push @info, "# $md5 ($filesize)";
 } or warn $@;
 
+my $aspect = eval {
+       require Term::ReadKey;
+       my ($w, $h, $x, $y) = Term::ReadKey::GetTerminalSize();
+       return $x/$w / $y*$h;
+};
+
 open my $pgm, '-|', convert => (
        $file =>
        -delete => '1--1',
-       '+distort' => SRT => '0,0 1,.56 0',
+       $aspect ? ('+distort' => SRT => "0,0 1,$aspect 0") : (),
        -thumbnail => $size || '40x12',
        -colorspace => 'gray',
        '-normalize',