+
+# Same as the "ppmmake" command: creates a solid-colored PPM.
+# Does not understand the rgb.txt color names except "black" and "white".
+#
+sub ppmmake($$$$) {
+ my ($outfile, $bgcolor, $w, $h) = @_;
+
+ my ($r, $g, $b);
+ if ($bgcolor =~ m/^\#?([\dA-F][\dA-F])([\dA-F][\dA-F])([\dA-F][\dA-F])$/i ||
+ $bgcolor =~ m/^\#?([\dA-F])([\dA-F])([\dA-F])$/i) {
+ ($r, $g, $b) = (hex($1), hex($2), hex($3));
+ } elsif ($bgcolor =~ m/^black$/i) {
+ ($r, $g, $b) = (0, 0, 0);
+ } elsif ($bgcolor =~ m/^white$/i) {
+ ($r, $g, $b) = (0xFF, 0xFF, 0xFF);
+ } else {
+ error ("unparsable color name: $bgcolor");
+ }
+
+ my $pixel = pack('CCC', $r, $g, $b);
+ my $bits = "P6\n$w $h\n255\n" . ($pixel x ($w * $h));
+
+ local *OUT;
+ open (OUT, ">$outfile") || error ("$outfile: $!");
+ print OUT $bits;
+ close OUT;
+}
+
+