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First attempt at 'why not compiz' FAQ. 

svn path=/trunk/KDE/kdebase/workspace/; revision=759915
icc-effect-5.14.5
Luboš Luňák 2008-01-11 13:46:25 +00:00
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@ -178,3 +178,62 @@ to use source code of effects shipped with KWin (the Howto effect as the startin
and/or ask on the KWin mailing list.
Links to various KWin-related documents are available at http://techbase.kde.org/Projects/KWin .
= FAQ =
== Why not Compiz? ==
Is it possible to use Compiz instead of KWin with KDE, however KWin remains the default window manager.
The option of replacing KWin with Compiz had been evaluated before work on compositing features
of KWin started and the conclusion was, in short, that it would lead to a lot of work and duplicated
effort.
To answer in more detail, several technical things need to be explained. Both KWin and Compiz
are a combined window manager and compositing manager. Window manager functionality takes care
of all aspects of handling windows, such as their placement, selecting the active one as so on.
This functionality is crucial for a desktop - without a window manager it would be very difficult
to perform most operations with windows. Compositing manager functionality, on the other hand,
can be considered optional - while it brings many new features, it is still possible very well
to use a desktop (such as with KWin in KDE3).
The reasons to add compositing support to KWin instead of using Compiz include:
- Compiz at the present time is very likely the most advanced compositing manager with many features,
with a headstart when compared with KWin, however, this cannot be said about Compiz as the window manager,
where KWin has the advantage of being a much more tested codebase, providing more stable, well-tested
and robust window manager, with many features. Given that, as said above, window manager functionality
is considered to be more important, it would be unwise to force all KDE users to a change that
would likely mean regressions in many aspects.
These regressions would include lesser integration with KDE, visual and behavioral changes
(the 'KDE window decorator' shipped with Compiz only mimics the look of KWin's decorations,
but does not provide the same functionality, even the Alt+F3 popup menu visibly differs),
possible introduction of problems that have already been fixed in KWin, missing features
that have already been implemented in KWin, and so on. Developing, testing and bugfixing a window
manager can be a very demanding work and repeating all the work done on KWin again for Compiz would
presumably require a lot of effort. As such, claims that KWin is 'reinventing the wheel' are missing
the point, since Compiz, being a relatively new window manager, is reinventing at least as much,
if not more, from other window managers including KWin,
Also, given that there can be only one window manager and one compositing manager at a time,
there would not be possibly a way to remedy these problems by somehow running Compiz and KWin together.
- Compiz currently does not work at all when compositing is not possible, thus requiring a fallback
window manager for such case. This in practice would mean that KDE developers would be required
to work on improving Compiz and would have to keep KWin at least for maintenance as the fallback
for Compiz, thus having two window managers for KDE. Besides the developer work of taking care
of two window managers this would also bring many user problems resulting from two different
window managers, with differences in the look and feel, feature sets and bugs.
It should be also noted that Metacity, GNOME's window manager, has not been dropped in favour of Compiz
either, but is still, to our knowledge, under development and adding compositing features to it
is a work in progress.
== Why not use plugins from Compiz? ==
This option was considered in the past as well. After examination of Compiz code the conclusion was
that this is technically almost impossible. Compiz plugins appear to be merely parts of Compiz
that are separated from its core, but which still heavily depend on it - there are even plugins
that appear to copy and paste parts of Compiz core and modify it. Making it possible to use such
plugins from KWin would essentially require KWin to become Compiz.