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List:       kde-devel
Subject:    khtml and transparent PNGs
From:       Malte.Starostik () t-online ! de (Malte Starostik)
Date:       2000-08-18 7:32:02
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Hi,

I just noticed that khtml won't display transparent PNGs as such but fill the 
transparent areas with black. It all comes down to qmovie.cpp:431:
// TODO: transparency

For GIFs, frameDone() gets called, for PNGs frameDone(const QPoint &, const 
QRect &) and that lacks transparency. Can anyone tell
1. Why not plain frameDone() like with GIFs?
2. Does it always happen?
3. When will TT implement transparency for that case?

As a workaround, khtml could use QMovie::frameImage() instead of 
framePixmap(). The image has got a correct alpha channel. That could even be 
a step towards full alpha support, no? OTOH I don't know what QImage would 
impose on performance and it wouldn't be BC. Wait, if CachedImage used 
frameImage() internally and returned a convertFromImage()'ed pixmap instead 
of framePixmap()...? Well, the latter would only matter if TT is going to 
keep this TODO line for a while.

Okay, IMHO support for transparent PNGs is quite important. Should I 
provide such a workaround or will QMovie be fixed anytime soon?

-Malte
 
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