added support for P5 portable graymap

diff --git a/scripts/evolis-driver.pl b/scripts/evolis-driver.pl
index 811d420..5797688 100755 (executable)
--- a/scripts/evolis-driver.pl
+++ b/scripts/evolis-driver.pl
@@ -57,7 +57,7 @@ sub read_pbm {
                local $/ = undef;
                $bitmap = <$pbm>;
                warn "# $path $size ", length($bitmap), " bytes\n";
-       } elsif ( $magic eq 'P6' ) { # portable pixmap
+       } elsif ( $magic eq 'P5' || $magic eq 'P6' ) { # portable graymap/pixmap
                my $max_color = <$pbm>; chomp $max_color;
 
                my $trashold = $max_color / 2;
@@ -68,9 +68,11 @@ sub read_pbm {
                my $mask = 0x80;
                my $byte = 0;
 
+               my $step = $magic eq 'P6' ? 3 : 1;
+
                my $o = 0;
                while ( $o < length($rgb) ) {
-                       my $px = ord(substr($rgb,$o,1)); $o += 3;
+                       my $px = ord(substr($rgb,$o,1)); $o += $step;
                        $byte ^= $mask if $px < $trashold;
                        $mask >>= 1;
                        if ( ! $mask ) {