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Nico Weber f8362c8abf LibGfx/JPEG2000: Remove an incorrect VERIFY in TagTree construction 
...and add a test case that shows why it's incorrect.

If one dimension is 2^n + 1 and the other side is just 1, then the
topmost node will have 2^n x 1 and 1 x 1 children. The first child will
have n levels of children. The 1 x 1 child could end immediately, or it
could require that it also has n levels of (all 1 x 1) children. The
spec isn't clear on which of the two alternatives should happen. We
currently have n levels of 1 x 1 blocks.

This test case shows that a VERIFY we had was incorrect, so remove it.

The alternative implementation is to keep the VERIFY and to add a

    if (x_count == 1 && y_count == 1)
        level = 0;

to the top of TagTreeNode::create(). Then we don't have multiple levels
of 1 x 1 nodes, and we need to read fewer bits.

The images in the spec suggest that all nodes should have the same
number of levels, so go with that interpretation for now. Once we can
actually decode images, we'll hopefully see which of the two
interpretations is correct.

(The removed VERIFY() is hit when decoding
Tests/LibGfx/test-inputs/jpeg2000/buggie-gray.jpf in a local branch that
has some image decoding implemented. That file contains a packet with
1x3 code-blocks, which hits this case.)
2024-04-28 01:12:20 +02:00
.devcontainer
.github
AK AK: Add the SetOnce class 2024-04-26 23:46:23 -06:00
Base
Documentation
Kernel Kernel: Use the AK SetOnce container class in various cases 2024-04-26 23:46:23 -06:00
Ladybird Ladybird: Retreive the tab title from the underlying Tab 2024-04-27 13:39:47 -04:00
Meta LibWeb: Don't generate Bindings/Forward.h 2024-04-27 18:29:35 -04:00
Ports
Tests LibGfx/JPEG2000: Remove an incorrect VERIFY in TagTree construction 2024-04-28 01:12:20 +02:00
Toolchain
Userland LibGfx/JPEG2000: Remove an incorrect VERIFY in TagTree construction 2024-04-28 01:12:20 +02:00
.clang-format
.clang-tidy
.editorconfig
.gitattributes
.gitignore
.gn
.mailmap
.pre-commit-config.yaml
.prettierignore
.prettierrc
.ycm_extra_conf.py
azure-pipelines.yml
CMakeLists.txt
CONTRIBUTING.md
flake.lock
flake.nix
LICENSE
README.md
SECURITY.md

README.md

SerenityOS

Graphical Unix-like operating system for x86-64 computers.

GitHub Actions Status Azure DevOps Status Fuzzing Status Sonar Cube Static Analysis Discord

FAQ | Documentation | Build Instructions

About

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:

Screenshot

Screenshot as of c03b788.png

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. Serenity runs on Linux, macOS (aarch64 might be a challenge), Windows (with WSL2) and many other *Nixes with hardware or software virtualization.

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.