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

[John C. Tull]

An unfortunate side-effect of the most recent change is seg-faulting on existing qgis projects. Any thoughts on how to get around this? I would gladly hand-edit my xml project file if necessary.

Cheers,
John

On Jul 8, 2010, at 4:12 AM, Marco Hugentobler wrote:

> 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
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