[gdal-dev] Questions about MBTiles write support @ GDAL 2.1 RC4

[Even Rouault]

Le lundi 02 mai 2016 15:11:54, gunnarblom a écrit :
> Even Rouault-2 wrote
> 
> > Ah ok, you can generate overviews/zoom layers with gdaladdo /
> > GDALBuildOverviews().
> 
> I tried using GDALBuildOverviews() but it generates a separate .ovr file
> and does not include it in the MBTiles file, right?

Open the dataset in update mode to get proper internal overviews in lower zoom 
levels.

> 
> If I'm looking at the code, it seems like it is checking that the database
> isn't in read-only mode, but it never writes the actual overview/zoom
> layers to the MBTiles database? What is going on there?

It does, indirectly through GDALRegenerateOverviewsMultiBand() that will 
trigger the IWriteBlock() method.

> 
> 
> 
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