[Qgis-developer] Processing C++ algorithms

[Matthias Kuhn]

On 09/14/2016 11:32 AM, Nyall Dawson wrote:
> On 14 Sep 2016 7:20 PM, "Matthias Kuhn" <matthias at opengis.ch
> <mailto:matthias at opengis.ch>> wrote:
>>
>> Hi,
>>
>> If one wants to create a C++ processing algorithm, is there any
>> preferred way to ship it? I don't think we are doing that yet apart from
>> calling 3rd party tools.
>>
>> The possible approaches I can see are
>>
>>  * Add a new QGIS module "algs" next to gui/core etc and use
>>    it's python bindings to call the code from a small python wrapper.
> 
> So it would sit between core and gui (ie no widgets)?

That should go into a separate module. I'll need to ship different QML
widgets instead.

> 
> I'd lean this way, but am wondering why not just put the code in core?
> What specific algorithms do you have in mind?

Separation of concerns ;)

Basically rendering tiles into a geopackage.

Matthias


> 
> Nyall
> 
>>
>>  * Port some processing core classes to C++, mainly GeoAlgorithm,
>>    outputs and parameters (and possibly some dependencies).
>>
>>  * Ship it as a separate module and do it all the grass/saga etc. way.
>>
>> Context is, I will probably need this on QField with no python. I could
>> do it without processing there but since the trend is to processize
>> whatever possible, I thought it would be a good opportunity to bring
>> this subject to the table.
>>
>> Matthias
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