[Qgis-developer] Re: Segmentation fault while reading raster maps

[Peter Ersts]

Howdy JJL.

mColorShadingAlgorithm is an enum so it will always be initialized. Your 
suggested fix works because you have effectively just "turned off" 
shading. The little code snipped you sent in the previous message seems 
to work fine with valid rasters, three band as well as paletted.

I am inclined to believe that the problem has to do with your data being 
recognized as a paletted image, but the color table is missing, which we 
should be able to gracefully deal with no matter. Any chance that  one 
of your layers has a .qml associated with it?

If you possible, could you send me a link to where I could get a copy of 
one of your images that is causing the segfaults?

-pete

JJL wrote:
> Hello again,
>
> 2009/2/11 JJL <buggerone at gmail.com>:
>   
>> I have a segmentation fault with a python plugin when I do some
>> multiples reading of raster maps.
>>     
> I still have the problem with trunk but I think I found the bug in
> QgsRasterLayer class.
>
> mColorShadingAlgorithm is used uninitialized in
> setColorShadingAlgorithm() after the QgsRasterLayer instance is
> created. So if it has the same value as theShadingAlgorithm the
> setRasterShaderFunction() is not called on mRasterShader.
>
> If I simply add :
> mColorShadingAlgorithm = QgsRasterLayer::UndefinedShader;
> to the QgsRasterLayer constructor, I have no more crash. I'm not sure
> this is the right value to use for init.
>
> Should I fill a bug in trac for this to be included in next
> maintenance release ?
>
> Regards
> JJL
>
>   


-- 
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Peter J. Ersts, Project Specialist
American Museum of Natural History
Center for Biodiversity and Conservation
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