This is an almost-pure Raku PNG module.
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.
Range checks (UInt, UInt8, and PInt, mentioned below) are disabled pending a Rakudo bugfix. Violate them at your peril.
use Image::PNG::Portable; my $o = Image::PNG::Portable.new: :width(16), :height(16); $o.set: 8,8, 255,255,255; $o.write: 'image.png';
The following types are used internally and in this documentation. They are here for brevity, not exported in the public API.
subset UInt of Int where * >= 0; # unsigned subset UInt8 of Int where 0 <= * <= 255; # unsigned 8-bit subset PInt of Int where * > 0; # positive
.new(PInt :$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.
Writes the contents of the image to the specified file.
None known. Please report bugs at https://github.com/raydiak/Image-PNG-Portable/issues or to firstname.lastname@example.org .