[Tilesathome] Lowzoom Place Labels displaced

[Sebastian Spaeth]

Knut Arne Bjørndal wrote:
> On Fri, Sep 19, 2008 at 09:20:57AM +0200, Sebastian Spaeth wrote:
>> Knut Arne Bjørndal wrote:
>>> On Fri, Sep 19, 2008 at 07:25:04AM +0200, Sebastian Spaeth wrote:
>>>> This is still the case. The lower zoom, the worse. That is why I turned 
>>>> of lowzoom captions on z0-6 again. Continent captions, country captions 
>>>> were far (extremely far) out of place. I think the place where Oslo is 
>>>> located was labeled "Italy" :-).
>> ...
>>> I had a look at that patch, and couldn't really wrap my head around
>>> why it would work. I discussed the projection stuff with 80n a while
>>> ago, and iirc he had tried making those calculations more accurate
>>> without seeing any improvements in the output, so I'm not sure that's
>>> the way to go to fix the problem.
>> Perhaps it makes no different on z12 (I think deelkar once calculated 
>> that it's half a pixel in z12 or so) and then we can skip this on osma. 
>> But fixing this in orp so we can do lowzoom captions would still be great.
> 
> The context was lowzoom, so definitely lower than z12. It really would
> be good to have better projection in both osmarenders, that's the core
> reason we do so many rasterizer calls too, isn't it?

Yes. If we did proper projection, we could cut the number of inkscape 
calls by a factor of 10. Cutting a full zoom level inkscape in 256x256 
tiles rather than doing one y-stripe at a time would be beneficial (from 
a render time perspective)

spaetz