214f5a6f98
When we allocate a graphene_point_t on the stack, there's no guarantee that it will be aligned at an 8-byte boundary, which is an assumption made by gsk_pathop_encode() (which wants to use the lowest 3 bits to encode the operation). In the places where it matters, force the points on the stack and embedded in structs to be nicely aligned. By using a distinct type for this (a union with a suitable size and alignment), we ensure that the compiler will warn or error whenever we can't prove that a particular point is, in fact, suitably aligned. We can go from a `GskAlignedPoint *` to a `graphene_point_t *` (which is always valid, because the `GskAlignedPoint` is aligned) via &aligned_points[0].pt, but we cannot go back the other way (which is not always valid, because the `graphene_point_t` is not necessarily aligned nicely) without a cast. In practice, it seems that a graphene_point_t on x86_64 *is* usually placed at an 8-byte boundary, but this is not the case on 32-bit architectures or on s390x. In many cases we can avoid needing an explicit reference to the more complicated type by making use of a transparent union. There's already at least one transparent union in GSK's public API, so it's presumably portable enough to match GTK's requirements. Increasing the alignment of GskAlignedPoint also requires adjusting how a GskStandardContour is allocated and initialized. This data structure allocates extra memory to hold an array of GskAlignedPoint outside the bounds of the struct itself, and that array now needs to be aligned suitably. Previously the array started with at next byte after the flexible array of gskpathop, but the alignment of a gskpathop is only 4 bytes on 32-bit architectures, so depending on the number of gskpathop in the trailing flexible array, that pointer might be an unsuitable location to allocate a GskAlignedPoint. Resolves: https://gitlab.gnome.org/GNOME/gtk/-/issues/6395 Signed-off-by: Simon McVittie <smcv@debian.org> |
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build-aux | ||
demos | ||
docs | ||
examples | ||
gdk | ||
gsk | ||
gtk | ||
modules | ||
po | ||
subprojects | ||
tests | ||
testsuite | ||
tools | ||
.clang-format | ||
.editorconfig | ||
.flake8 | ||
.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.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
- 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