[Marble-devel] Supporting transparent overlays

[Torsten Rahn]

Awesome. Thanks a lot! Our default submission procedure would be if you uploaded the patch to reviewboard:

https://git.reviewboard.kde.org/dashboard/

Looking at the patch I wonder whether the (performance critical) blending of the pixel in MergedLayerDecorator should only be performed if the pixel is not opaque. So the "old" implementation would still be called for opaque pixels while your new implementation would be called for semitransparent pixels. On and a fully transparent pixel wouldn't require a scanline call of course ..

Best regards,
Torsten

-----Original-Nachricht-----
Betreff: [Marble-devel] Supporting transparent overlays
Datum: Thu, 31 Jul 2014 11:20:29 +0200
Von: Knut Schleßelmann <knut.schlesselmann at lagom.de>
An: marble-devel at kde.org

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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