npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

jpeg-asm

v2.0.0

Published

Encoding and decoding images via libjpeg

Downloads

51

Readme

jpeg-asm

jpeg-asm-logo

Node.js CI

Encoding and decoding images via libjpeg

libjpeg version: 9d of 12-Jan-2020

Installation

installing with npm:

npm install jpeg-asm --save

OR

Use /dist/jpegasm.js for a browser-friendly version of the library.

Decode JPEG

const jpegasm = require('jpeg-asm');

const buf = new ArrayBuffer(/* ... */);

// init buffer

jpegasm.decode(buf, (err, decoded) => {
  // err: Error
  // OR
  // decoded: { buffer: ArrayBuffer, width: number, height: number }
});

Encode JPEG

const jpegasm = require('jpeg-asm');

const buf = new ArrayBuffer(/* ... */);

// init buffer

const options = {
  width: X,
  height: Y,
  quality: 80
};

jpegasm.encode(buf, options, (err, encoded) => {
  // err: Error
  // OR
  // encoded: ArrayBuffer
});

Examples

The examples directory contains an example how to encode and decode an image in a browser.

API

.decode(buf, cb)

Decodes a JPEG image.

Arguments:

  • buf - source buffer: ArrayBuffer
  • cb - a callback that gets 2 arguments:
    • err - decoding Error
    • decoded - an object that describes the decoded image: { width: number, height: number, data: ArrayBuffer } where data represents colors in RGB format.
jpegasm.decode(buf, (err, decoded) => { /* ... */ });

.encode(buf, options, cb)

Encodes buffer to a JPEG format.

Arguments:

  • buf - source buffer: ArrayBuffer
  • [options] - an optional object with settings to encode an image. Supported options:
    • width - width of the image in buf
    • height- height of the image in buf
    • quality - a numberic value [0-100], describes quality of encoding. 0 - low quality, 100 - high quality.
  • cb - a callback that gets 2 arguments:
    • err - encoding Error
    • encoded - an object that describes the encoded image: { width: number, height: number, data: ArrayBuffer }
const encoded = jpegasm.encode(buf, options, (err, encoded) => { /* ... */ });

Tests

To run the tests for jpeg-asm:

npm test

Building

To compile libjpeg to javascript:

npm run build:debug
# OR
npm run build:release

Compiling details.

To build a browser-friendly version of the library, run:

npm run browser:debug
# OR
npm run browser:release

Contact

[Grigorii Chudnov] (mailto:[email protected])

License

jpeg-asm distributed under the The MIT License (MIT).

libjpeg has a custom BSD-like license (free software).