[Qgis-developer] master slow reading rasters?

Martin Dobias wonder.sk at gmail.com
Fri Mar 21 04:42:58 PDT 2014

Hi Paolo!

On Wed, Mar 19, 2014 at 6:03 PM, Paolo Cavallini <cavallini at faunalia.it> wrote:
> Hash: SHA1
> Il 19/03/2014 17:54, Paolo Cavallini ha scritto:
>> One unpleasant effect is: when zooming in, it first loads a preview, then the image
>> disappears, then it shows at full resolution.

What happens is that first the previously rendered image is shown
zoomed in, then in next map update (by default 250ms) it shows the
newly rendered map. If it takes longer to render the layer, it may
happen that empty map is shown. I guess this can be solved by keeping
the preview from previous rendering for each layer until there is
sufficient amount of new data to show.

> another issue, probably also a side effect: WMS downloading progress is no longer
> shown on the status bar; I personally miss it.

Yes this is a side effect of MTR. I have removed the downloading
progress from status bar, because the situation is more complex now -
there could be more such requests at the same time and the existing
mechanism wasn't flexible enough to reflect that. I am thinking about
having some better progress reporting, maybe something to discuss at
the hackfest.


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