[Marble-devel] Supporting transparent overlays

[Knut Schleßelmann]

So, instead of waiting I tried to fix the overlay blending myself ;-) At least 
for me it seems to work (using just one overlay). You could have a look at the 
things I've done in the atteched patch ;-)

Am Donnerstag, 31. Juli 2014, 11:20:18 schrieb Knut Schleßelmann:
> Hi there,
> 
> right now I try to show some PNG files with transparent background on a
> MarbleWidget using GeoDataGroundOverlay.
> 
> Sadly it looks like marble discard the alpha channel at some place (IMHO it
> could be in ImageF.cpp) and displays the background in black. That's not
> quite satisfactory since I'd like to simply add some visual information to
> the OSM theme.
> 
> Is it possible to fix this or can I use some other feature to display an
> overlay with transparent background?
> 
> regards
> 
> 
> Knut
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