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Re: OT: Need a graphics algorithm

> A better solution would be (I assume that you have B in a separate
> bitmap, since you want to adjust the transparency) to pre-process B
> before it gets copied into A. Just scan each line and when you
> encounter an edge, perform "antialiasing" by manipulating the alpha
> value of the pixels around (just like the traditional antialiasing
> techniques)
>
> Florent

B isn't really in its own bitmap, but the edges are well defined so it may
as well be. Your idea would work, but if I want 5 pixels of "blend", when
scanning the top line and adding transparency, I'd need to do it to the 2nd
line (and 3rd 4th etc) all of which have no "edges".

Finding the single edge pixels is easy, but finding all pixels with in 5
pixels of the edge is harder and also keeping track so I don't add
transparency to the same pixel more than once.

Trygve
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References: 
 >Re: OT: Need a graphics algorithm (From: Douglas Norton <email@hidden>)



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