It's trivially easy, actually.  Just render the selection region to a 
1-bit mask, then test the mask pixels to see if a display pixel should 
be rendered.

Ray


Chambers wrote:
> Alain wrote:
>> Also, rendering an irregular shaped area could ultimately be slower 
>> than a slightly to large area. This will be due to a substentialy more 
>> complex code. The code for a simple square section is simple: you 
>> limit the region to render. That for an arbitrary free-hand capture 
>> will need to test every pixel against the desired area. You may also 
>> need to render, but not display, in a, square, region larger than the 
>> selected area.
> 
> While I don't necessarily think we need this feature, I don't think it 
> would be that bad.  For each line, you could just store the beginning 
> and ending points (assuming only convex shapes were allowed) and render 
> a straight line across.
> 
> ...Chambers

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