[gdal-dev] WMTS improve performance

[Michał Kowalczuk]

Dear GDAL friends,
I'm looking for tips & tricks for improving performance when working with
WMTS services.
As I mentioned in previous mails, I work with GDAL C API.
My main task is to generate image for a given extent and defined output
image size (WxH).
I convert this extent to appropriate offset and source window size.
Using GDALDatasetRasterIO and pBuffer I create bitmap in required format.
This method is different from what I see in, for example, QGIS, where each
tile is paint individually when it is ready (downloaded).
My first idea is to create N connections with the WMTS server and divide
the desired extent into smaller parts and run process in N threads, but it
stink of problems for gdalwmscache manager if independent connections
download the same tile and try to save it on a disk.

Is my idea a good direction?
I would like to ask more experienced users for some advice on this topic :-)

Regards,
Michał
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