[Qgis-user] Serious bug returns to Qgis revision 13878

[Marco Hugentobler]

Hi William

It is disabled now (r13899).
Let me know if you find out more (or some conditions when the icon can be 
savely enabled).

Regards,
Marco

Am Dienstag, 6. Juli 2010, um 17.17:55 schrieb William Kyngesburye:
> For release, maybe disble it, and work on a solution for 1.6?
> 
> A note about the raster format - I wonder if it only affects rasters
> without overviews.  For the vrts in Greg's test, though the files
> referenced in the vrts are JP2s, does a vrt inherit the overviews?  I did
> a test with a single 1 GiB JP2 and it generates the legend icon nearly
> instantaneously.  A 1.3 GiB tiff without overviews takes a long time, yet
> the same with overviews is fast.  A 200MiB tiff without overviews has a
> noticable delay, but it's not horrible.
> 
> Though, Greg's test vrts are quite small, just 14MiB across 4 vrts.  Maybe
> there's something else with a vrt that slows down the legend generation? 
> Zooming and panning are not affected.
> 
> On Jul 6, 2010, at 4:21 AM, Marco Hugentobler wrote:
> >> (a raster scaled down to 16x16 pixels usually
> >> doesn't provide a good overview)
> > 
> > I made a little self-test here and it was quite easy to distinguish
> > different topographic map sheets by their legend icons (even if they
> > have exactly the same color schema).
> > 
> > Regards,
> > Marco
> > 
> > Am Dienstag, 6. Juli 2010, um 10.26:10 schrieb Martin Dobias:
> >> Hi
> >> 
> >> On Tue, Jul 6, 2010 at 8:35 AM, Marco Hugentobler
> >> 
> >> <marco.hugentobler at sourcepole.ch> wrote:
> >>> Hi William
> >>> 
> >>> Ah, good to know it is the icon generation that makes loading projects
> >>> with many raster layers slow.
> >>> 
> >>> Making a user option to disable layer icons sounds good. However, this
> >>> would involve a string change (option dialog). String freeze for 1.5 is
> >>> already over for a while now. So (unless there is a better solution for
> >>> the problem without string change) something for 1.6...
> >> 
> >> in my opinion, we could actually remove this feature. I don't find it
> >> particularly useful (a raster scaled down to 16x16 pixels usually
> >> doesn't provide a good overview), it adds additional overhead when the
> >> raster layer is loaded and further complicates the complex raster
> >> code. Another argument could be that vector layer also don't have an
> >> icon containing the preview.
> >> 
> >> I'm just afraid of creating too many configurable options that barely
> >> anyone will understand their purpose.
> >> 
> >> Regards
> >> Martin
> 
> -----
> William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
> http://www.kyngchaos.com/
> 
> "I ache, therefore I am.  Or in my case - I am, therefore I ache."
> 
> - Marvin


-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Webereistrasse 66, 8134 Adliswil, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee