[jitter] Please help- two movies in 1 window

hello daniela,

there are a number of problems with your patch, not the least being  
readability.

you have all the basic elements in place, but obviously you are in  
the dark on how to use them.

the matrix dstdim defines how the incoming matrix is mapped to the  
outgoing matrix. you change either the source-dimension if you want  
to zoom into (upscale) the incoming matrix or you use the destination- 
dimension to zoom out (downscale) the outgoing matrix.

you need to use an alphablend process on both streams in order to  
apply the mask before compositing in the final matrix.

you also need to clear the scaling matrix to clean up leftover pixels  
from previous frames.

i cleaned up your patch and added pattr functionality to make  
initialisation and presets possible, see below.

hth

/*j

>  I am trying to use the dstdim with one matrix  to have two movies  
> in one jit.window that are  playing simultaneously. ( each movie is  
> inside a black circle, both are inside a big window)
>
>  I am lost!! I am not sure how to work with my matrix and how to  
> control the dstdim attrributes  in order to see the 2 movies in a  
> smaller dimention.

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