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Contributing to libjxl

Contributing with bug reports

For security-related issues please see SECURITY.md.

We welcome suggestions, feature requests and bug reports. Before opening a new issue please take a look if there is already an existing one in the following link:

Contributing with patches and Pull Requests

We'd love to accept your contributions to the JPEG XL Project. Please read through this section before sending a Pull Request.

Contributor License Agreements

Our project is open source under the terms outlined in the LICENSE and PATENTS files. Before we can accept your contributions, even for small changes, there are just a few small guidelines you need to follow:

Please fill out either the individual or corporate Contributor License Agreement (CLA) with Google. JPEG XL Project is an an effort by multiple individuals and companies, including the initial contributors Cloudinary and Google, but Google is the legal entity in charge of receiving these CLA and relicensing this software:

  • If you are an individual writing original source code and you're sure you own the intellectual property, then you'll need to sign an individual CLA.

  • If you work for a company that wants to allow you to contribute your work, then you'll need to sign a corporate CLA.

Follow either of the two links above to access the appropriate CLA and instructions for how to sign and return it. Once we receive it, we'll be able to accept your pull requests.

NOTE: Only original source code from you and other people that have signed the CLA can be accepted into the main repository.

License

Contributions are licensed under the project's LICENSE. Each new file must include the following header when possible, with comment style adapted to the language as needed:

// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

Code Reviews

All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose. Consult GitHub Help for more information on using pull requests.

Contribution philosophy

  • Prefer small changes, even if they don't implement a complete feature. Small changes are easier to review and can be submitted faster. Think about what's the smallest unit you can send that makes sense to review and submit in isolation. For example, new modules that are not yet used by the tools but have their own unittests are ok. If you have unrelated changes that you discovered while working on something else, please send them in a different Pull Request. If your are refactoring code and changing functionality try to send the refactor first without any change in functionality. Reviewers may ask you to split a Pull Request and it is easier to create a smaller change from the beginning.

  • Describe your commits. Add a meaningful description to your commit message, explain what you are changing if it is not trivially obvious, but more importantly explain why you are making those changes. For example "Fix build" is not a good commit message, describe what build and if it makes sense why is this fixing it or why was it failing without this. It is very likely that people far in the future without any context you have right now will be looking at your commit trying to figure out why was the change introduced. If related to an issue in this or another repository include a link to it.

  • Code Style: We follow the Google C++ Coding Style. A clang-format configuration file is available to automatically format your code, you can invoke it with the ./ci.sh lint helper tool.

  • Testing: Test your change and explain in the commit message how your commit was tested. For example adding unittests or in some cases just testing with the existing ones is enough. In any case, mention what testing was performed so reviewers can evaluate whether that's enough testing. In many cases, testing that the Continuous Integration workflow passes is enough.

  • Make one commit per Pull Request / review, unless there's a good reason not to. If you have multiple changes send multiple Pull Requests and each one can have its own review.

  • When addressing comments from reviewers prefer to squash or fixup your edits and force-push your commit. When merging changes into the repository we don't want to include the history of code review back and forth changes or typos. Reviewers can click on the "force-pushed" automatic comment on a Pull Request to see the changes between versions. We use "Rebase and merge" policy to keep a linear git history which is easier to reason about.

  • Your change must pass the build and test workflows. There's a ci.sh script to help building and testing these configurations. See building and testing for more details.

Contributing checklist.

  • Sign the CLA (only needed once per user, see above).

  • AUTHORS: If this is your first contribution, add your name or your company name to the AUTHORS file for copyright tracking purposes.

  • Style guide. Check ./ci.sh lint.

  • Meaningful commit description: What and why, links to issues, testing procedure.

  • Squashed multiple edits into a single commit.

  • Upload your changes to your fork and create a Pull Request.

Community Guidelines

This project follows Google's Open Source Community Guidelines.