[Bf-compositor] Share data between interface and composite node.

[Jeroen Bakker]

Hello Pawel,

the shared data in Blender is located in the DNA. This DNA is accessible 
to the widget (via RNA) and is used by the Compositor (most of the time 
by copying the data to the Composite Operations.

So when you want to access data of an Operation it must be made 
accessible to other parts of blender via DNA and RNA.

The DNA of the compositor can be found in the next file. 
https://git.blender.org/gitweb/gitweb.cgi/blender.git/blob/HEAD:/source/blender/makesdna/DNA_node_types.h
The RNA of the compositor can be found in the next file 
https://git.blender.org/gitweb/gitweb.cgi/blender.git/blob/HEAD:/source/blender/makesrna/intern/rna_nodetree.c

The DNA describes how the data is structured, the RNA will tell Blender 
how to evaluate the data when it changes. The datastructure that is 
being used is NodeChroma.

Now it should be accessible in the widget. But during compositing it 
should be transferred to the specific operation (ColorMatte)

In the file 
https://git.blender.org/gitweb/gitweb.cgi/blender.git/blob/HEAD:/source/blender/compositor/nodes/COM_ColorMatteNode.cpp 
this transfer takes place.

Hope this will help you.

Best regards,
Jeroen


On 12/14/2015 03:57 PM, Paweł Kozłowski wrote:
> Hello,
>
> is it possible to get data from slider in Node to interface_widget.c ? 
> I mean, I have value of slider in COM_ColorMatteOperation.cpp but I 
> need it also this value in interface_widget.c in drawing function, has 
> it any acces via pointers to gui values? Could you adwise me?
>
> best regards
> Pawel
>
>
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