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This attempts to improve the somewhat "erratic" feeling of scrolling a GtkTextView with fractional scaling. However, it also improves the situation where you have a natural integer scaling factor such as 2x. To do so, it quantizes the X/Y origin of the visible rect to something that naturally alignes with device pixels. By doing so this aims to get consistent pixel alignment when hinting so that you no longer see jumps as the Y position of the buffer changes. X is also done for symmetry. The buffer itself is left in integer coordinates to avoid any sort of ABI breakage with existing applications. Only the origin x/y of the drawing area is affected and thus should only affect the ABI of gtk_text_view_get_visible_rect() by < 1 device pixel. Applications which require precision in the visible rect origin may use the new API introduced here as gtk_text_view_get_visible_offset(). This provides the X,Y point as doubles. graphene_point_t was not used here beacuse that appeared to cause aliasing due to float usage. GNOME/GtkSourceView!375 provides an example of consuming this new API to keep line numbers aligned in the same fashion as the textview contents.
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.flatpakrepo
flatpak install gnome-nightly org.gtk.Demo4
flatpak install gnome-nightly org.gtk.WidgetFactory4
flatpak 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 Wayland backend, you will also need:
- Wayland-client
- Wayland-protocols
- Wayland-cursor
- Wayland-EGL
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
Once you have all the necessary dependencies, you can build GTK by using Meson:
$ meson setup _build
$ meson compile -C_build
You can run the test suite using:
$ meson test -C_build
And, finally, you can install GTK using:
$ sudo meson install -C_build
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
- what windowing system (X11 or Wayland)
- what graphics driver / mesa version
- for Linux, which distribution
- if you built GTK, the list of options used to configure the build
Most of this information can be found in the GTK inspector.
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