Awesome
fast-png
PNG image decoder and encoder written entirely in JavaScript.
<h3 align="center"> <a href="https://www.zakodium.com"> <img src="https://www.zakodium.com/brand/zakodium-logo-white.svg" width="50" alt="Zakodium logo" /> </a> <p> Maintained by <a href="https://www.zakodium.com">Zakodium</a> </p>
Installation
$ npm install --save fast-png
Usage
decode(png[, options])
Arguments
png- A TypedArray or Buffer that contains the PNG data.options- An object of options
Options
checkCrc- If set totrue, the CRC will be checked for each chunk and an error will be thrown in case it's wrong (default: false).
encode(image)
Arguments
png- An object representing the image. You can pass an ImageData from the Canvas API or an object with the following properties:width- The width of the imageheight- The height of the imagedata- An array or TypedArray with the image datadepth- A number indicating the color depth (only 8 and 16 are supported now). Default:8.channels- Number of channels, including alpha (1, 2, 3 and 4 are supported). Default:4.text- An object with key-value pairs representingtEXtchunks. The keys must have less than 80 characters. The keys and values must have only characters in the latin1 charset (maximum code point of 255). Default:undefined.
hasPngSignature(array)
Returns whether the array starts with the PNG signature (magic bytes).
PNG standard
Spec can be found at: https://www.w3.org/TR/PNG/