termcol: use Imager for generic PNG generation

[sheet.git] / termcol.plp

diff --git a/termcol.plp b/termcol.plp
index 32a73560285a0fb4a9f096b859b3ee1404536972..73bf0d2190d5f3132b8ecd3e1ff70cdc65cf7642 100644 (file)
--- a/termcol.plp
+++ b/termcol.plp
@@ -14,6 +14,8 @@ Html({
        stylesheet => [qw'light dark'],
 });
 
+my $imgfile = $get{img} // exists $get{img} && 'indi.png';
+
 my @termlist;
 push @termlist, split /\W+/, $ENV{PATH_INFO} || 'default';
 
@@ -42,6 +44,7 @@ print
 
 <div class="section">
 <:
+use 5.010;
 use Shiar_Sheet::Colour '1.03';
 use List::Util qw( min max );
 
@@ -49,7 +52,7 @@ my $palettes = do 'termcol.inc.pl';
 die "Cannot open palette data: $_\n" for $@ || $! || ();
 
 sub colcell {
-       my $name = shift // return "<td colspan=3>\n";
+       my $name = shift // return "<td>\n";
        my $col = Shiar_Sheet::Colour->new(@_);
        my $minhex = $col->rgb24;
        my $css     = '#' . $col->rgb48;
@@ -60,14 +63,33 @@ sub colcell {
 
        my $out = sprintf('<td title="%s" style="%s">%s',
                join(',', map { int } @$col),
-               "background:$css; color:$inverse; padding:0 1ex",
+               "background:$css; color:$inverse",
                $name,
        );
-       $out .= sprintf '<td style="%s"><code>%s</code>', "background:$_; color:$css", $minhex
-               for @$sample;
+       $out .= sprintf('<samp style="%s"><small>%s</small></samp>',
+               "background:$_; color:$css", $minhex
+       ) for @$sample;
        return "$out\n";
 }
 
+sub img_egapal {
+       my ($palette) = @_;
+       return eval {
+               require Imager;
+               require MIME::Base64;
+
+               my @imgpal = map { Imager::Color->new(ref $_ ? @$_ : $_) } @{$palette};
+               state $img = Imager->new(file => "data/$imgfile")
+                       or die Imager->errstr.$/;
+               @{[ $img->getcolors ]} == @imgpal
+                       or die "incompatible palette size\n";
+               $img->setcolors(colors => \@imgpal);
+               $img->write(data => \my $imgdata, type => 'png');
+               return sprintf '<img src="data:image/png;base64,%s">',
+                       MIME::Base64::encode_base64($imgdata);
+       } || $@;
+}
+
 for my $term (@termlist) {
        my $info = $palettes->{$term};
        ref $info eq 'HASH' or next;
@@ -83,7 +105,7 @@ for my $term (@termlist) {
        ) if $info->{href} or $info->{title};
 
        if (my $mapinfo = $info->{rgbmap}) {
-               print '<table class="mapped">'."\n";
+               print '<table class="color mapped">'."\n";
                printf "<caption>%s</caption>\n", $caption;
                print coltable_hsv(@{$mapinfo});
                print "</table>\n\n";
@@ -94,7 +116,7 @@ for my $term (@termlist) {
                        $colours = [ map { $colours->[$_] =~ s/:|$/:$_/r } @{$reorder} ];
                }
 
-               print '<table>', "\n";
+               print '<table class=color>', "\n";
                printf "<caption>%s</caption>\n", $caption;
                for my $num (0 .. $#{$colours}) {
                        my ($rgb, $name) = split /:/, $colours->[$num], 3;
@@ -103,6 +125,8 @@ for my $term (@termlist) {
                        $name = [ $name, ['#333'] ] if $term eq 'xkcd';
                        print '<tr>', colcell($name, $rgb);
                }
+
+               print '<tr><td>', img_egapal(\@{$colours}) if $imgfile;
                print "</table>\n\n";
        }
 }
@@ -114,7 +138,6 @@ sub coltable_hsv {
        my $vmax = $dim - 1;
        my $smax = $dim - 1;
        $rgbval ||= sub { join('', @_), map { int $_ * 255 / $vmax } @_ };
-       $greyramp ||= [];
 
        my %greymap;  # name => value
        my @colmap;  # saturation => value => hue => [name, r,g,b]
@@ -130,9 +153,15 @@ sub coltable_hsv {
                                my $s = abs(min(@rgb) - max(@rgb));
 
                                if (!$s) {
-                                       my ($index, $l) = $rgbval->(@rgb);
-                                       $greymap{$index} = $l;
-                                       next;
+                                       if ($greyramp) {
+                                               my ($index, $l) = $rgbval->(@rgb);
+                                               $greymap{$index} = $l;
+                                               next;
+                                       }
+
+                                       $h = $hmax;  # greyscale hue
+                                       $s = 1;  # lowest saturation for other hues
+                                       $v = $s = $vmax if !$v;  # black at full saturation
                                }
 
                                $v = $vmax - $v;
@@ -144,22 +173,33 @@ sub coltable_hsv {
        }
 
        my $out = '';
-       $out .= sprintf '<colgroup span=%d>', 3 * @{$_} for @colmap;
+       $out .= sprintf '<colgroup span=%d>', scalar @{$_} for @colmap;
        my $huerow = $colmap[0][0]; # first {$_} map { @{$_} } @colmap;
        for my $h (grep { $huerow->[$_] } 0 .. $#{$huerow}) {
                $out .= '<tr>';
                $out .= colcell(@$_) for map { $_->[$h] } map { @{$_} } @colmap;
        }
 
-       $offset += $dim ** 3;
-       $greymap{$offset++} = $_ for @{$greyramp};
+       if ($greyramp) {
+               $offset += $dim ** 3;
+               $greymap{$offset++} = $_ for @{$greyramp};
+       }
+
+       if (%greymap) {
+               $out .= '<tbody>';
+               my $col = 0;
+               my $colbreak = scalar map { @$_ } @colmap;  # same width as hue rows
+               for my $num (sort { $greymap{$a} <=> $greymap{$b} } keys %greymap) {
+                       $out .= '<tr>' unless $col++ % $colbreak;
+                       $out .= colcell($num, ($greymap{$num}));
+               }
+       }
 
-       $out .= '<tbody>';
-       my $col = 0;
-       my $colbreak = scalar map { @$_ } @colmap;  # same width as hue rows
-       for my $num (sort { $greymap{$a} <=> $greymap{$b} } keys %greymap) {
-               $out .= '<tr>' unless $col++ % $colbreak;
-               $out .= colcell($num, ($greymap{$num}) x 3);
+       if ($imgfile) {
+               my @palette = map { [ @{$_}[1 .. 3] ] } map {@$_} map {@$_} @colmap;
+               my $imgdata = img_egapal(\@palette);
+               my $tablespan = scalar map { @$_ } @colmap;
+               $out .= "<tr><td colspan=$tablespan>$imgdata";
        }
 
        return $out;