[Kde-games-devel] KBreakout

[Dmitry Suzdalev]

On Wednesday 20 June 2007 22:47, Fela Winkelmolen wrote:
> > the simple mechanism is to just save out the rendered pixmaps on exit and
> > load from there. this is what we will be doing in Plasma::Svg. the icon
> > cache that rivo is working on as part of his SoC project will come to
> > good use here as well.
>
> I'm not sure I understand exactly how that would work, I'll have look at
> the icon cache when I'm going to implement caching.
Well, speaking of kdegames, katomic and klines (which I happen to maintain ;)) 
already use such kind of caching - but only for background. Which currently 
takes most of loading & rendering time upon startup.

These games just save rendered background as png at exit (using overloaded 
KMainWindow::queryClose() method).

If background has high resolution, it may take some time though. So I added 
even more optimisation: while saving I write dimensions of last saved 
background to config file, so further saves are done only if current size of 
bkgnd differs from one in config file. If not - new size is written to config 
file and background saving takes place.

I save only background, because small and not very complex elements of svg are 
rendered quite quickly.

Ah, and you can look at the actual code if you have kdegames checkout or using 
websvn. katomicrenderer.cpp for katomic and renderer.cpp for klines (actually 
saving code looks quite similar ;)).

Hope this helps :)

Dmitry.