[Okular-devel] Slow painting on QImage

[Tobias Koenig]

Hi,

after I've ported the OOo Generator to QImage yesterday I realized that
painting on the QImage was 3x slower than painting on the QPixmap.

Today I asked the Zack how this can happen and he explained that for
rendering the text, the X server is still queried in current version of
Qt4, so drawing text in a QImage is quite inefficient.

One solution is to do all the paiting on a QPixmap and to the convertion
to a QImage only once...

Another problem we came accross here is that painting to a QPixmap or
drawing text (which is rendered by X) is only allowed in the main thread!!!

So we have a real problem with threaded generators. The poppler
generator didn't hit this issue since it renders the font itself, or?

Ciao,
Tobias
-- 
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The Council of the European Union is an undemocratic and illegal institution!
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