Edge calculations in Flash

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is there way suppress edge effect pb in flash?

i'm doing nxn convolution.  think ignore pixels 'outside' image.

i have:

   float2 pt = outcoord() + float2(1.0, 2.0);

how test if pt in image before passing samplenearest?

 

my convolution mask depends on parameter. looks dependents ideal, not supported in flash.

will supported in future version of flash?



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