40 lines
922 B
Raku
40 lines
922 B
Raku
#!/usr/bin/env perl6
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# Reference:
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# https://rosettacode.org/wiki/Bitmap/Write_a_PPM_file#Perl_6
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use v6;
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class Pixel { has uint8 ($.R, $.G, $.B) }
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class Bitmap {
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has UInt ($.width, $.height);
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has Pixel @!data;
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method fill(Pixel $p) {
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@!data = $p.clone xx ($!width*$!height)
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}
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method pixel(
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$i where ^$!width,
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$j where ^$!height
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--> Pixel
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) is rw { @!data[$i*$!height + $j] }
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method data { @!data }
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}
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role PPM {
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method P6 returns Blob {
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"P6\n{self.width} {self.height}\n255\n".encode('ascii')
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~ Blob.new: flat map { .R, .G, .B }, self.data
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}
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}
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my Bitmap $b = Bitmap.new(width => 125, height => 125) but PPM;
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for flat ^$b.height X ^$b.width -> $i, $j {
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$b.pixel($i, $j) = Pixel.new: :R($i*2), :G($j*2), :B(255-$i*2);
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}
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my $proc = run '/usr/bin/convert','-','output_piped.jpg', :in;
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$proc.in.write: $b.P6;
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$proc.in.close;
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