Jiri Drbalek

@cpaulik Yes, both visual and unit tests can run single test case. ### Visual tests This is an example how to run single visual test: ```console $ test/visual/run --agg -s...

Looks good. I'm thinking what to do with https://github.com/mapnik/mapnik/pull/3975/commits/7aa06d96e73983aacc461e1706df7bf51644d0dc. @flippmoke is right that `filter-factor` does two different things at once. I would just remove that commit with no replacement. We...

> is it possible to switch to gpu to render? No, this is not possible. Mapnik uses only CPU for rendering. > I have noticed that mapnik just renders a...

> So can you please help me find the classes which are responsible of rendering? Mapnik has several renderers: AGG, Cairo, Grid and SVG. The AGG renderer is most advanced....

> what about using vector tiles? That would probably help, especially for large scales, but I don't want to do any recommendations without knowing details of your solution. There is...

Implementation of rendering to or from vector tiles by Mapnik is in https://github.com/mapbox/mapnik-vector-tile/. This implementation is used in [node-mapnik](https://github.com/mapnik/node-mapnik/), where you can easily use vector tiles without any C++ programing....

The slow thing here is GDAL datasource initialization with those rasters? Will you render from grib2 files or will you reproject them to tiff files, for example? 5760x2881 is not...

I know that there is compile-time switch in libtiff `DEFER_STRILE_LOAD` that may help in your situation: https://gitlab.com/libtiff/libtiff/blob/981e43ecae83935625c86c9118c0778c942c7048/libtiff/tif_config.h.in#L24-25 More info in https://www.asmail.be/msg0055456995.html What is the problem with splitting bands into standalone...

Hi. You need a little bit of logic atop Mapnik. I presume you are rendering to tiles. Split your maps to individual Mapnik Maps, create a polygon of map borders...

Thanks for sharing more info. By tiles I meant you don't need or want to render whole map at once. Thus for bbox of your rendered image you can say...