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Truly independent web browser
61647 commits 1 branch 0 tags 444 MiB
C++ 74.4%
HTML 14.3%
JavaScript 8.6%
CMake 0.8%
Objective-C++ 0.6%
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Nico Weber cae672e1f9 LibGfx/WebPWriter: Implement color indexing transform 
If an image has 256 or fewer colors, WebP/Lossless allows storing
the colors in a helper image, and then storing just indexes into that
helper image in the main image's green channel, while setting
r, b, and a of the main image to 0.

Since constant-color channels need to space to store in WebP,
this reduces storage needed to 1/4th (if alpha is used) or 1/3rd
(if alpha is constant across the image).

If an image has <= 16 colors, WebP lossless files pack multiple
color table indexes into a single pixel's green channel, further
reducing file size. This pixel packing is not yet implemented in
this commit.

GIFs can store at most 256 colors per frame, so animated gifs
often have 256 or fewer colors, making this effective when
transcoding gifs.

(WebP also has a "subtract green" transform, which can be used
to need to store just a single channel for grayscale images, without
having to store a color table. That's not yet implemented -- for now,
we'll now store grayscale images using this color indexing transform
instead, which wastes to storage for the color table.)

(If an image has <= 256 colors but all these colors use only a single
channel, then storing a color table for these colors is also wasteful,
at least if the image has > 16 colors too. That's rare in practice,
but maybe we can add code for it later on.)

(WebP also has a "color cache" feature where the last few used colors
can be referenced using very few bits. This is what the webp spec says
is similar to palettes as well. We don't implement color cache writing
support yet either; maybe it's better than using a color indexing
transform for some inputs.)

Some numbers on my test files:

sunset-retro.png: No performance or binary size impact. The input
quickly uses more than 256 colors.

giphy.gif (184k): 4.1M -> 3.9M, 95.5 ms ± 4.9 ms -> 106.4 ms ± 5.3 ms
Most frames use more than 256 colors, but just barely. So fairly
expensive runtime wise, with just a small win.

(See comment on #24454 for the previous 4.9 MiB -> 4.1 MiB drop.)

7z7c.gif (11K): 118K -> 40K
Every frame has less than 256 colors (but more than 16, so no packing),
and so we can cut filesize roughly to 1/3rd: We only need to store an
index per channel. From 10.7x as large as the input to 3.6x as large.
2024-05-31 22:39:25 +02:00
.devcontainer Meta: Switch to clang-format-18 as the standard formatter 2024-04-24 16:50:01 -04:00
.github CI: Bump JamesIves/github-pages-deploy-action from 4.6.0 to 4.6.1 2024-05-23 00:54:43 -06:00
AK AK: Enable format string checking in Clang builds 2024-05-29 13:34:15 -06:00
Base Base: Add a manual page for the shred utility 2024-05-31 17:39:59 +02:00
Documentation Toolchain+Docs: Improve the way to enable clangd 2024-05-23 00:54:20 -06:00
Kernel Kernel: Prevent integer overflow in USB::Hub::check_for_port_updates() 2024-05-27 17:35:42 +02:00
Ladybird Ladybird/AppKit: Implement a basic find-in-page panel 2024-05-31 06:30:39 -04:00
Meta Meta: Port recent changes to the GN build 2024-05-31 10:44:00 -04:00
Ports Ports/file: Build host version to ensure we can properly cross compile 2024-05-23 01:00:39 +02:00
Tests WPT: Update test expectations to match current test results 2024-05-30 11:03:56 -06:00
Toolchain Toolchain+Docs: Improve the way to enable clangd 2024-05-23 00:54:20 -06:00
Userland LibGfx/WebPWriter: Implement color indexing transform 2024-05-31 22:39:25 +02:00
.clang-format Meta: Support using clang-format on Objective-C++ files 2023-08-22 21:36:19 -04:00
.clang-tidy Meta: Disable readability-function-cognitive-complexity in clang-tidy 2024-02-05 08:04:24 -07:00
.editorconfig Meta: Add .editorconfig 2022-09-10 17:32:55 +01:00
.gitattributes Repository: Protect port patches from CRLF/LF normalization 2022-01-12 01:08:38 +01:00
.gitignore Meta: Move .DS_Store rule to the bottom of the .gitignore file 2023-11-14 14:53:37 -05:00
.gn Meta: Automatically generate a compilation database for clangd 2023-11-14 14:29:35 -05:00
.mailmap Everywhere: Update copyrights with my new serenityos.org e-mail :^) 2023-07-15 16:21:29 +02:00
.pre-commit-config.yaml Meta: Add a post-commit commit message linter hook 2021-05-02 16:28:01 +02:00
.prettierignore LibJS: Add DisposableStack{, Prototype, Constructor} 2023-01-23 09:56:50 +00:00
.prettierrc Meta: Move prettier config files to the root of the repository 2020-08-24 18:21:33 +02:00
.ycm_extra_conf.py Meta: Remove i686 references in YCM configuration 2022-12-28 11:53:41 +01:00
CMakeLists.txt CMake: Enable ClangPlugins for Serenity builds if ENABLE_CLANG_PLUGINS 2024-05-14 12:46:05 -06:00
CONTRIBUTING.md Meta: Add Tim Ledbetter to list of project maintainers :^) 2024-05-23 20:33:43 +02:00
flake.lock nix: Clean up files, use good practices 2024-03-25 14:19:34 -06:00
flake.nix nix: Clean up files, use good practices 2024-03-25 14:19:34 -06:00
LICENSE Meta: Update the year range in LICENSE 2024-01-06 17:39:16 -05:00
README.md CI: Remove the Sonar Cloud and PVS Studio workflow 2024-05-11 15:43:18 -04:00
SECURITY.md Meta: Add a security policy 2022-06-29 03:29:27 +00:00

README.md

SerenityOS and Ladybird

SerenityOS is a graphical Unix-like operating system for x86-64 computers.

Ladybird is a cross-platform independent web browser built from SerenityOS components.

GitHub Actions Status Fuzzing Status Discord

FAQ | Documentation | Build Instructions

About SerenityOS

SerenityOS is a love letter to '90s user interfaces with a custom Unix-like core. It flatters with sincerity by stealing beautiful ideas from various other systems.

Roughly speaking, the goal is a marriage between the aesthetic of late-1990s productivity software and the power-user accessibility of late-2000s *nix. This is a system by us, for us, based on the things we like.

You can watch videos of the system being developed on YouTube:

About Ladybird

Ladybird is a cross-platform independent web browser built from SerenityOS components. It is a separate project from SerenityOS, but it uses the SerenityOS build system and shares much of the same code. All the browser UI code lives in the Serenity repository under the Ladybird directory. The SerenityOS LibGUI port of Ladybird lives in the Userland/Applications/Browser directory. All the implementation details are in the Userland/Libraries and Userland/Services directories.

See the Ladybird README.md for more information.

SerenityOS Screenshot

Screenshot as of c03b788.png

SerenityOS Features

  • Modern x86 64-bit kernel with pre-emptive multi-threading
  • Browser with JavaScript, WebAssembly, and more (check the spec compliance for JS, CSS, and Wasm)
  • Security features (hardware protections, limited userland capabilities, W^X memory, pledge & unveil, (K)ASLR, OOM-resistance, web-content isolation, state-of-the-art TLS algorithms, ...)
  • System services (WindowServer, LoginServer, AudioServer, WebServer, RequestServer, CrashServer, ...) and modern IPC
  • Good POSIX compatibility (LibC, Shell, syscalls, signals, pseudoterminals, filesystem notifications, standard Unix utilities, ...)
  • POSIX-like virtual file systems (/proc, /dev, /sys, /tmp, ...) and ext2 file system
  • Network stack and applications with support for IPv4, TCP, UDP; DNS, HTTP, Gemini, IMAP, NTP
  • Profiling, debugging and other development tools (Kernel-supported profiling, CrashReporter, interactive GUI playground, HexEditor, HackStudio IDE for C++ and more)
  • Libraries for everything from cryptography to OpenGL, audio, JavaScript, GUI, playing chess, ...
  • Support for many common and uncommon file formats (PNG, JPEG, GIF, MP3, WAV, FLAC, ZIP, TAR, PDF, QOI, Gemini, ...)
  • Unified style and design philosophy, flexible theming system, custom (bitmap and vector) fonts
  • Games (Solitaire, Minesweeper, 2048, chess, Conway's Game of Life, ...) and demos (CatDog, Starfield, Eyes, mandelbrot set, WidgetGallery, ...)
  • Every-day GUI programs and utilities (Spreadsheet with JavaScript, TextEditor, Terminal, PixelPaint, various multimedia viewers and players, Mail, Assistant, Calculator, ...)

... and all of the above are right in this repository, no extra dependencies, built from-scratch by us :^)

Additionally, there are over three hundred ports of popular open-source software, including games, compilers, Unix tools, multimedia apps and more.

How do I read the documentation?

Man pages are available online at man.serenityos.org. These pages are generated from the Markdown source files in Base/usr/share/man and updated automatically.

When running SerenityOS you can use man for the terminal interface, or help for the GUI.

Code-related documentation can be found in the documentation folder.

How do I build and run this?

See the SerenityOS build instructions or the Ladybird build instructions.

The build system supports a cross-compilation build of SerenityOS from Linux, macOS, Windows (with WSL2) and many other *Nixes. The default build system commands will launch a QEMU instance running the OS with hardware or software virtualization enabled as supported.

Ladybird runs on the same platforms that can be the host for a cross build of SerenityOS and on SerenityOS itself.

Get in touch and participate!

Join our Discord server: SerenityOS Discord

Before opening an issue, please see the issue policy.

A general guide for contributing can be found in CONTRIBUTING.md.

Authors

And many more! See here for a full contributor list. The people listed above have landed more than 100 commits in the project. :^)

License

SerenityOS is licensed under a 2-clause BSD license.