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Rodrigo Tobar 1b90ea7d3a LibPDF: Augment Type11FontProgram with Type2 capabilities 
The Type1FontProgram logic was based on the Adobe Type 1 Font Format; in
particular, it implemented the CharStrings Dictionary section
(charstring decoding, and most commands). In the case of Type1, these
charstrings are read from a PS1 diciontary, with one entry per character
in the font's charset. This has served us well for Type1 font rendering.

When implementing Type1C font rendering, this wasn't enough. Type1C PDF
fonts are specified in embedded CFF (Compact Font File) streams, which
also contain a charstring dictionary with an entry for each character in
the font's charset. These entries can be slightly different from those
in a PS1 Font Program though: depending on a flag in the CFF, the
entries will be encoded either in the original charstring format from
the Adobe Type 1 Font Format, or in the "Type 2 Charstring Format"
(Adobe's Technical Note #1577). This new format is for the most part a
super-set of the original, with small differences, all in the name of
making the representation as compact as possible:

 * The glyph's width is not specified via a separate command; instead
   it's an optional additional argument to the first command of the
   charstring stream (and even then, it's only the *difference* to a
   nominal character width specified in the CFF).
 * The interpretation of a 4-byte number is different from Type 1: in
   Type 1 this is a 4-byte unsigned integer, whereas in Type 1 it's a
   fixed decimal with 16 bits of fractional part.
 * Many commands accept a variable set of arguments, so they can draw
   more than one line/curve on a single go. These are all
   retro-compatible with Type 1's commands.

All these changes are implemented in this patch in a
backwards-compatible way. To ensure Type 1/2 behavior is accessed, a new
parameter indicates which behavior is desired when decoding the
charstring stream.

I also took the chance to centralise some logic that was previously
duplicated across the parse_glyph function. Common lambdas capture the
logic for moving to, or drawing a line/curve to a given point and
updating the glyph state. Similarly, some command logic, including
reading parameters, are shared by several commands. Finally, I've
re-organised the cases in the main switch to group together related
commands.
2023-01-25 15:40:11 +01:00
.devcontainer Meta: Add libssl-dev as a dependency to the devcontainer 2022-12-16 01:04:11 -07:00
.github CI: Install a more up-to-date version of emscripten 2023-01-20 14:24:12 -05:00
AK AK: Add convenience substring wrappers to String to exclude a length 2023-01-24 16:23:50 -05:00
Base Base: Add a radial gradient with transparent end stops canvas demo 2023-01-23 10:03:54 +00:00
Documentation Documentation: Add a link list 2023-01-24 19:51:13 +00:00
Kernel Kernel: Allow to remove files from sticky directory if user owns it 2023-01-24 20:13:30 +00:00
Ladybird Ladybird: Add LocationEdit Highlighting 2023-01-22 21:15:22 -07:00
Meta LibWasm: Port the parser to Core::Stream 2023-01-25 17:10:05 +03:30
Ports Ports: Fix compatiblity issues with running package.sh on Serenity 2023-01-19 12:22:24 +01:00
Tests LibWasm: Port the parser to Core::Stream 2023-01-25 17:10:05 +03:30
Toolchain Toolchain: Ensure aarch64 libgcc_s.so.1 includes DT_SONAME tag 2023-01-25 14:28:53 +01:00
Userland LibPDF: Augment Type11FontProgram with Type2 capabilities 2023-01-25 15:40:11 +01:00
.clang-format Meta: Switch to clang-format-15 as the standard formatter 2022-12-03 23:52:23 +00:00
.clang-tidy Meta: Disable readability-use-anyofallof clang-tidy check 2022-01-09 23:29:57 -08:00
.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: Ignore vim's .exrc config 2022-10-06 16:06:50 +01:00
.mailmap Meta: Add mattco98's full name to mailmap 2022-11-23 17:13:49 +00:00
.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
azure-pipelines.yml CI: Remove extraneous toolchain job from Azure CI 2022-12-28 15:26:12 -05:00
CMakeLists.txt Meta+CMake: Extract Wasm spec tests into the binary directory 2022-12-14 20:29:43 +03:30
CONTRIBUTING.md Meta: Add Jelle Raaijmakers to list of project maintainers :^) 2023-01-05 00:32:05 +01:00
LICENSE Meta: Update the year range in LICENSE :^) 2023-01-01 09:38:07 +00:00
README.md Meta: Remove i686 target 2022-12-28 11:53:41 +01:00
SECURITY.md Meta: Add a security policy 2022-06-29 03:29:27 +00:00

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

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:

FAQ: Frequently Asked Questions

Screenshot

Screenshot as of b36968c.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, detailed program analysis with software emulation in UserspaceEmulator, 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 two 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.