This change allows to include the effect_builtins.cpp into the build of
e.g. a kcm without having to link against all effects.
The use case for this is when one needs to resolve just the name of an
effect without wanting to hard code the name.
The EffectData in BuiltinEffects is extended by all the data needed for
the desktop effects KCM:
* display name
* comment
* category
* video-url
* exclusive group
* internal
This information is taken directly from the desktop files.
The Built-in effects are now also resolved through the BuiltInEffects
namespace and the KServiceTypeTrader query is adjusted to only find the
scripted effects.
Unfortunately this introduces another round of adding "kwin4_effect_" to
load and save the effects correctly. This will be removed once all KCMs
are adjusted to use the new BuiltInEffects.
Instead of having several hashes with data about the built-in effect,
we use a struct EffectData which contains the name, the enabled by
default state and function pointers to create, supported and check
enabled by default. There is one static vector with all the data
specified which is ordered by the BuiltInEffect enum. Thus an enum value
can be used as an index to the data.
In addition it's no longer resolved around QByteArray, but uses QString.
REVIEW: 117354
For each effect the value from the desktop file is added. This will
allow to query all effects which need to be loaded without looking for
the service files.
The functionality is to check whether the effect should be enabled by
default. It's not about whether the effect is enabled by default. This
is also needed as it's currently still taken from the plugin data.
For each effect there is an enum value. The internal mapping of effect to
create, supported and checkDefault is switched to the enum value, though
the methods for the name based variants are still available.
As all effects have always been compiled into the same .so file it's
questionable whether resolving the effects through a library is useful
at all. By linking against the built-in effects we gain the following
advantages:
* don't have to load/unload the KLibrary
* don't have to resolve the create, supported and enabled functions
* no version check required
* no dependency resolving (effects don't use it)
* remove the KWIN_EFFECT macros from the effects
All the effects are now registered in an effects_builtins file which
maps the name to a factory method and supported or enabled by default
methods.
During loading the effects we first check whether there is a built-in
effect by the given name and make a shortcut to create it through that.
If that's not possible the normal plugin loading is used.
Completely unscientific testing [1] showed an improvement of almost 10
msec during loading all the effects I use.
[1] QElapsedTimer around the loading code, start kwin five times, take
average.
REVIEW: 115073
