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

[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
> 
> 
> -- 
> 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
> _______________________________________________
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-----
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