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

[William Kyngesburye]

P.S. using GDAL 1.7.2.

On Jul 6, 2010, at 10:17 AM, William Kyngesburye wrote:

> 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/

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