[Qgis-developer] slow raster loading

[Etienne Tourigny]

Hi all,

I had noticed the slow loading you refer to, when I got a copy of the master branch last week,  but it seems to be fixed now.

If you opened a raster from the command-line (i.e. qgis file.tif), the raster stats were fetched (and stored in the .aux.xml file) automatically, hence the delay.


Now the proper behaviour is happening, i.e. the stats are only calculated upon demand (such as when opening the histogram tab).


The "Object::connect: No such signal" problem is unrelated, and I have been seeing it ever since using 1.7.  This should definitely get fixed...




----- Original Message -----
From: Giovanni Manghi <giovanni.manghi at gmail.com>
To: Tim Sutton <lists at linfiniti.com>
Cc: qgis-developer <qgis-developer at lists.osgeo.org>
Sent: Tuesday, August 9, 2011 8:57:48 PM
Subject: Re: [Qgis-developer] slow raster loading

Hi Tim,


> This may be fixed via a patch given to me by Etienne Sky - please let
> me know if it still does it.


just tested your last commit and I still see

Warning: Object::connect: No such signal
QgsGdalProvider::statusChanged( QString )
in /home/gio/qgis-Quantum-GIS-4b4820e/src/core/raster/qgsrasterlayer.cpp:2446


> Yes thats why I was asking if the file permissions exist to write the
> aux.xml. If they don't behaviour should be the same as prior to my
> native raster stats commits i.e. stats will be recalced each time you
> open a project / add a layer and trigger something that needs the
> stats.


I copied a geotiff in a folder with no write permissions and it took a
lot of time to open the raster, much more than it used to take when
opening the same image the first time in a folder with write
permissions.

Then I compiled QGIS with your last commit and now it seems it is not
collecting stats/creating the aux.xml file anymore.

cheers

-- Giovanni --

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