paint.c 0.1.2

paint.c 0.1.2

paint.c as a Flatpak. It changes the app id to
io.github.vancevoj.paintc, makes paint.c behave inside the Flatpak
sandbox and adds a Flatpak bundle to the downloads. Features, platforms
and known gaps are otherwise those of
paint.c 0.1.1
and 0.1.0
(their notes: packaging/RELEASE_NOTES_0.1.1.md, RELEASE_NOTES_0.1.0.md).

paint.c is an independent clean-room project. It is not affiliated with
or endorsed by dotPDN LLC; Paint.NET is their trademark.

Install

Linux with Flatpak: install paint.c
(open it with GNOME Software or KDE Discover; updates then arrive with your
other apps), or flatpak install --user https://vancevoj.github.io/paintc-flatpak/io.github.vancevoj.paintc.flatpakref.
The .flatpak file below installs the same build without the repository
(no automatic updates).

Downloads

File	For
paintc-0.1.2-linux-x86_64.flatpak	Linux x86_64 with Flatpak: open it in GNOME Software or KDE Discover, or flatpak install --user paintc-0.1.2-linux-x86_64.flatpak; the runtime (org.freedesktop.Platform 26.08) comes from Flathub
paintc-0.1.2-linux-x86_64.AppImage	Linux x86_64 with glibc 2.31 or newer (Ubuntu 20.04, Debian 11, Fedora 32 and later), Wayland or X11
paintc-0.1.2-windows-x64-setup.exe	Windows 10 22H2 or Windows 11, x64: installer with Start menu entry and file associations
paintc-0.1.2-windows-x64-portable.zip	the same program without installation
paintc-0.1.2-source.tar.gz	source code; macOS users build from it (docs/BUILDING.md, section macOS)
SHA256SUMS.txt	SHA-256 of every file above

Installing and running otherwise work as in 0.1.0. Settings, recent files
and plugins of earlier versions are kept: their folders are named paintc
and do not depend on the app id. The Flatpak keeps its own settings under
~/.var/app/io.github.vancevoj.paintc/.

What changed

New app id

The app id is now io.github.vancevoj.paintc (ADR-025) everywhere it is
used: the desktop entry, AppStream metadata, icons and the MIME package on
Linux, the Wayland app id and X11 window class, the single instance name,
the macOS bundle identifier and the Windows assembly name. Effect ids keep
their org.paintc. prefix, so saved effect settings and plugins are
unaffected.

• Linux packages installed by hand (cmake --install) leave the old
  org.paintc.paintc desktop entry, icons and MIME file behind; remove
  them from the install prefix when you upgrade.
• A paint.c 0.1.1 that is still running does not receive files opened with
  0.1.2 (and the other way round), because the single instance name
  changed.

Flatpak

• Opening a file while paint.c runs in the Flatpak now reaches the open
  window. The single instance socket lives in the sandbox's shared runtime
  folder ($XDG_RUNTIME_DIR/app/io.github.vancevoj.paintc): abstract
  sockets, which paint.c uses elsewhere on Linux, do not cross the network
  namespaces of separate sandboxes.
• The Text tool lists the fonts installed on the host system and in the
  user's font folder, which Flatpak exposes under /run/host.
• The Flatpak manifest (packaging/flatpak/io.github.vancevoj.paintc.yml)
  targets the org.freedesktop.Platform 26.08 runtime and takes SDL3,
  libavif and libjxl from it. The Flatpak sees the Pictures folder
  directly and everything else through the file chooser portal, whose
  files stay available to recent files after a restart. The optional
  plugins go to
  ~/.var/app/io.github.vancevoj.paintc/data/paintc/plugins/.

Other

• Builds with GCC 16 without warnings, and a new CMake option
  PC_WERROR (default ON) lets distribution builds keep warnings from
  failing the build (ADR-026).

• The Text tool logs how many font faces it found, or why the font scan
  failed, to the log file.

• AppStream metadata with screenshots, links and branding colors for
  software centers (packaging/screenshots/ and
  packaging/screenshots/make-screenshots.sh, which renders them).

• The script command list in src/app/script.c names fit as a command of
  its own (zoom fit zoomed to 1%).

Optional plugins

The ten optional plugins of the
plugins-v1.0.0 release
work with 0.1.2 unchanged. Install them as described in docs/PLUGINS.md;
the Flatpak's plugins folder is named above.

Platforms and how they were verified

Same platforms and system requirements as 0.1.0. Packages are built with
the local release pipeline (docs/PACKAGING.md, Local releases). Every
CTest entry passes on Linux in a GCC 14 Release build and in a GCC 16
build inside the Flatpak SDK 26.08 against its SDL 3.4.14. The Flatpak was
built with org.flatpak.Builder and checked in its sandbox: the self test,
a window on Wayland, opening a file into the running instance, saving over
a file handed in by the document portal and the host fonts in the Text
tool. macOS remains unverified on a Mac since the last green
macOS CI run (ADR-021).

Checksums (SHA-256)

f5ec3e355ebfdb075827318cd4ed52040e8b88ad73678f5a8934ede6961397b3  paintc-0.1.2-linux-x86_64.flatpak
0c46889da6fc1caef66169a0d9c8f39545d9efa9516cbd64bbbc66d865c0acd7  paintc-0.1.2-linux-x86_64.AppImage
66670f421415788e1e0386910171686a443921a118f1427f99f198a4f9fcd15e  paintc-0.1.2-windows-x64-setup.exe
5d3b7754ba06b4ac18b058df7876af493d977ec316e43d6745143b13c15b7b69  paintc-0.1.2-windows-x64-portable.zip
05502bf2d242cbd19a6cde4bf595a5922869d481fec7231dbaf2c8172a24dfb2  paintc-0.1.2-source.tar.gz

SHA256SUMS.txt in the release has the same lines; check with
sha256sum -c SHA256SUMS.txt (Linux) or shasum -a 256 -c SHA256SUMS.txt
(macOS).

License and attribution

paint.c is MIT licensed (LICENSE). NOTICE carries the MIT attribution
of the algorithms re-implemented from Paint.NET 3.36. Every package has a
licenses folder with paint.c's license, the NOTICE and the license texts
of every bundled component, as in 0.1.0.