[mkgmap-dev] [PATCH v1] Performance improvement by removing unused elements before the style processing

Tue Jan 3 13:54:16 GMT 2012

WanMil <wmgcnfg at web.de> writes:

> Hi,
>
> this is another performance improvement:
>
> Usually the mkgmap input tiles are larger than the processed bounding
> box (splitter parameter overlap). So there are much many elements
> which are processed but thrown away at a late step in mkgmap.
>
> The patch tries to remove them much earlier before the style files are
> processed and before the LocationHook starts (which ignores them but
> that must also be calculated).
>
> The patch contains one drawback:
> Ways which have all its points outside the bounding box of the tile
> but which cross the tile are also removed. If that's a point the patch
> must be improved.

Isn't that the whole point of the larger bounding box, to not lose roads
which cross at corners?
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