2f445682b1
The current "create context/draw/destroy context" pattern presents
various problems. The first issue is that it defers memory management to
the caller of the create() or create_region() methods, which makes
bookkeeping of the cairo_t* harder for language bindings and third party
libraries. The second issue is that, while it's easier for
draw-and-forget texturs, this API is needlessly complicated for contents
that have to change programmatically - and it introduces constraints
like calling the drawing code explicitly after a surface resize (e.g.
inside an allocate() implementation).
By using a signal-based approach we can make the CairoTexture actor
behave like other actors, and like other libraries using Cairo as their
2D drawing API.
The semantics of the newly-introduced ::draw signal are the same as the
one used by GTK+:
- the signal is emitted on invalidation;
- the cairo_t* context is owned by the actor;
- it is safe to have multiple callbacks attached to the same
signal, to allow composition;
- the cairo_t* is already clipped to the invalidated area, so
that Cairo can discard geometry immediately before we upload
the texture data.
There are possible future improvements, like coalescing multiple
invalidations inside regions, and performing clipped draws during
the paint cycle; we could even perform clipped redraws if we know the
extent of the invalidated area.
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| build | ||
| clutter | ||
| doc | ||
| po | ||
| tests | ||
| .gitignore | ||
| autogen.sh | ||
| ChangeLog.pre-git-import | ||
| clutter.doap | ||
| configure.ac | ||
| COPYING | ||
| Makefile.am | ||
| NEWS | ||
| README.in | ||
| README.md | ||
Clutter
What is Clutter?
Clutter is an open source software library for creating fast, compelling, portable, and dynamic graphical user interfaces.
Requirements
Clutter currently requires:
On X11, Clutter depends on the following extensions:
- XComposite
- XDamage
- XExt
- XFixes
- XInput (1.x or 2.x)
- XKB
If you are building the API reference you will also need:
If you are building the additional documentation you will also need:
- xsltproc
- jw (optional, for generating PDFs)
If you are building the Introspection data you will also need:
If you want support for profiling Clutter you will also need:
Resources
The official Clutter website is:
http://www.clutter-project.org/
The API references for the latest stable release are available at:
http://docs.clutter-project.org/docs/clutter/stable/
http://docs.clutter-project.org/docs/cogl/stable/
http://docs.clutter-project.org/docs/cally/stable/
The Clutter Cookbook is available at:
http://docs.clutter-project.org/docs/clutter-cookbook/
New releases of Clutter are available at:
http://source.clutter-project.org/sources/clutter/
The Clutter blog is available at:
http://www.clutter-project.org/blog/
To subscribe to the Clutter mailing lists and read the archives, use the Mailman web interface available at:
http://lists.clutter-project.org/
New bug page on Bugzilla:
http://bugzilla.gnome.org/enter_bug.cgi?product=clutter
Clutter is licensed under the terms of the GNU Lesser General Public
License, version 2.1 or (at your option) later: see the COPYING file
for more information.
Building and Installation
To build Clutter from a release tarball, the usual autotool triad should be followed:
- ./configure
- make
- make install
To build Clutter from a Git clone, run the autogen.sh script instead
of the configure one. The autogen.sh script will run the configure script
for you, unless the NOCONFIGURE environment variable is set to a non-empty
value.
See also the BuildingClutter page on the wiki.
Versioning
Clutter uses the common "Linux kernel" versioning system, where even-numbered minor versions are stable and odd-numbered minor versions are development snapshots.
Different major versions break both API and ABI but are parallel installable. The same major version with differing minor version is expected to be ABI compatible with other minor versions; differing micro versions are meant just for bug fixing. On odd minor versions the newly added API might still change.
The micro version indicates the origin of the release: even micro numbers are only used for released archives; odd micro numbers are only used on the Git repository.
Contributing
If you want to hack on and improve Clutter check the HACKING file for
general implementation guidelines, and the HACKING.backends for
backend-specific implementation issues.
The CODING_STYLE file contains the rules for writing code conformant to
the style guidelines used throughout Clutter. Remember: the coding style
is mandatory; patches not conforming to it will be rejected by default.
The usual workflow for contributions should be:
- Fork the repository
- Create a branch (
git checkout -b my_work) - Commit your changes (
git commit -am "Added my awesome feature") - Push to the branch (
git push origin my_work) - Create an Bug with a link to your branch
- Sit back, relax and wait for feedback and eventual merge
Bugs
Bugs should be reported to the Clutter Bugzilla at:
http://bugzilla.gnome.org/enter_bug.cgi?product=clutter
You will need a Bugzilla account.
In the report you should include:
- what system you're running Clutter on;
- which version of Clutter you are using;
- which version of GLib and OpenGL (or OpenGL ES) you are using;
- which video card and which drivers you are using, including output of glxinfo and xdpyinfo (if applicable);
- how to reproduce the bug.
If you cannot reproduce the bug with one of the tests that come with Clutter source code, you should include a small test case displaying the bad behaviour.
If the bug exposes a crash, the exact text printed out and a stack trace obtained using gdb are greatly appreciated.