NAME

Image::PNG::Portable - portable PNG output for Raku

SYNOPSIS

use Image::PNG::Portable;
my $o = Image::PNG::Portable.new: :width(16), :height(16);
$o.set: 8,8, 255,255,255;
$o.write: 'image.png';

STATUS

This module is currently useful for outputting 8-bit-per-channel truecolor images. Reading, precompression filters, palettes, grayscale, non-8-bit channels, and ancillary features like gamma correction, color profiles, and textual metadata are all NYI.

DESCRIPTION

This is an almost-pure Raku PNG module.

USAGE

The following types are used internally and in this documentation. They are here for brevity, not exported in the public API.

subset UInt8 of Int where 0 <= * <= 255; # unsigned 8-bit
subset PInt  of Int where * > 0;         # positive

METHODS

.new(PInt :$width!, PInt :$height!, Bool $alpha = True)

Creates a new Image::PNG::Portable object, initialized to black. If the alpha channel is enabled, it is initialized to transparent.

.set(UInt $x, UInt $y, UInt8 $red, UInt8 $green, UInt8 $blue, UInt8 $alpha = 255)

Sets the color of a pixel in the image.

.set-all(UInt8 $red, UInt8 $green, UInt8 $blue, UInt8 $alpha = 255)

Sets the color of all pixels in the image.

.get(UInt $x, UInt $y)

Gets the color of a pixel in the image as an array of channel values.

.write($file)

Writes the contents of the image to the specified file.

AUTHOR

raydiak

COPYRIGHT AND LICENSE

Copyright 2015 - 2021 raydiak

Copyright 2025 Raku Community

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.