[Qgis-developer] Loading of GRASS rasters

[Radim Blazek]

On Sat, Dec 1, 2012 at 9:23 AM, Paolo Cavallini <cavallini at faunalia.it> wrote:
> Hi all.
> Loading of GRASS rasters is still very slow on master. Any plans to fix it?

Can you specify better how slow it is, if it is constant or what it
depends on? For me it takes to render one layer full screen 1-2s and
it seems to be constant.

Each draw runs external executable which reads GRASS data and QGIS
reads the data from its stdout. That is the right way GRASSers
recommend/allow. It adds some overhead for starting the executable, I
am no sure how fast is passing data via stdout.

It could be probably improved using the same like identify is using,
i.e. keep the GRASS module running and send data requests to its
stdin.

Radim

> Thanks.
> --
> Paolo Cavallini - Faunalia
> www.faunalia.eu
> Full contact details at www.faunalia.eu/pc
> Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario
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