8c5e046574
Make it use an alpha value that is well defined, ie 0.4 instead of 0.5. 0.4 * 255 = 102 0.5 * 255 = 127.5 This avoids rounding issues where some math may cause the resulting alpha value to be 127, and some other math ends up with 128. |
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| .gitlab/issue_templates | ||
| .gitlab-ci | ||
| build-aux | ||
| demos | ||
| docs | ||
| examples | ||
| gdk | ||
| gsk | ||
| gtk | ||
| modules | ||
| po | ||
| subprojects | ||
| tests | ||
| testsuite | ||
| tools | ||
| .clang-format | ||
| .editorconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| AUTHORS | ||
| CONTRIBUTING.md | ||
| COPYING | ||
| gtk.doap | ||
| gtk.supp | ||
| lsan.supp | ||
| make-pot | ||
| make-release.sh | ||
| meson_options.txt | ||
| meson.build | ||
| NEWS | ||
| NEWS.pre-1.0 | ||
| NEWS.pre-2.0 | ||
| NEWS.pre-3.0 | ||
| NEWS.pre-4.0 | ||
| README.md | ||
GTK — The GTK toolkit
General information
GTK is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK is suitable for projects ranging from small one-off projects to complete application suites.
GTK is a free and open-source software project. The licensing terms for GTK, the GNU LGPL, allow it to be used by all developers, including those developing proprietary software, without any license fees or royalties.
GTK is hosted by the GNOME project (thanks!) and used by a wide variety of applications and projects.
The official download location
The official web site
The official developers blog
Discussion forum
Nightly documentation can be found at
- Gtk: https://gnome.pages.gitlab.gnome.org/gtk/gtk4/
- Gdk: https://gnome.pages.gitlab.gnome.org/gtk/gdk4/
- Gsk: https://gnome.pages.gitlab.gnome.org/gtk/gsk4/
Nightly flatpaks of our demos can be installed from the GNOME Nightly repository:
flatpak remote-add --if-not-exists gnome-nightly https://nightly.gnome.org/gnome-nightly.flatpakrepoflatpak install gnome-nightly org.gtk.Demo4flatpak install gnome-nightly org.gtk.WidgetFactory4flatpak install gnome-nightly org.gtk.IconBrowser4
Building and installing
In order to build GTK you will need:
You will also need various dependencies, based on the platform you are building for:
If you are building the X11 backend, you will also need:
- Xlib, and the following X extensions:
- xrandr
- xrender
- xi
- xext
- xfixes
- xcursor
- xdamage
- xcomposite
If you are building the Wayland backend, you will also need:
- Wayland-client
- Wayland-protocols
- Wayland-cursor
- Wayland-EGL
Once you have all the necessary dependencies, you can build GTK by using Meson:
$ meson _build .
$ cd _build
$ ninja
You can run the test suite using:
$ meson test
And, finally, you can install GTK using:
$ sudo ninja install
Complete information about installing GTK and related libraries can be found in the file:
docs/reference/gtk/html/gtk-building.html
Or online
Building from git
The GTK sources are hosted on gitlab.gnome.org. The main
development branch is called main, and stable branches are named after their minor
version, for example gtk-4-10.
How to report bugs
Bugs should be reported on the issues page.
In the bug report please include:
-
Information about your system. For instance:
- which version of GTK you are using
- what operating system and version
- for Linux, which distribution
- if you built GTK, the list of options used to configure the build
And anything else you think is relevant.
-
How to reproduce the bug.
If you can reproduce it with one of the demo applications that are built in the demos/ subdirectory, on one of the test programs that are built in the tests/ subdirectory, that will be most convenient. Otherwise, please include a short test program that exhibits the behavior. As a last resort, you can also provide a pointer to a larger piece of software that can be downloaded.
-
If the bug was a crash, the exact text that was printed out when the crash occurred.
-
Further information such as stack traces may be useful, but is not necessary.
Contributing to GTK
Please, follow the contribution guide to know how to start contributing to GTK.
If you want to support GTK financially, please consider donating to the GNOME project, which runs the infrastructure hosting GTK.
Release notes
The release notes for GTK are part of the migration guide in the API reference. See:
Licensing terms
GTK is released under the terms of the GNU Lesser General Public License, version 2.1 or, at your option, any later version, as published by the Free Software Foundation.
Please, see the COPYING file for further information.
GTK includes a small number of source files under the Apache license:
- A fork of the roaring bitmaps implementation in gtk/roaring
- An adaptation of timsort from python in gtk/timsort