[gdal-dev] Any difference between VRT SimpleSource and no-op ComplexSource?

[Even Rouault]

Laurențiu,

>
> I noticed that gdalbuildvrt with no options produces VRTs that use 
> ComplexSource, when SimpleSource would be sufficient. Is there any 
> meaningful performance difference between the two? I know I should 
> measure myself, I just didn't get to try it yet.

It only uses a ComplexSource when it needs to, that is to say when there 
is nodata or a mask band. Otherwise it will use SimpleSource. There is a 
performance hit in using ComplexSource when it is not needed. In 3.8, 
there has been an optimization to improve ComplexSource performance in 
common nodata-only scenarios: cf 
https://github.com/OSGeo/gdal/commit/cd67491d3909f5f05160fa209609b38d973c42de

Even

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