Two more functions for the colorstrategy?

[Boudewijn Rempt]

KisPaintDevice has two function, clearSelection and applySelection that do 
some maths with the alpha value. Both functions use KisPixel with its 
hard-coded 8-bit alpha value, although clearSelection puts the value in a 
short

clearSelection does: MAX_SELECTED - selection alpha * device alpha
applySelection does: selection alpa * device alpha / MAX_SELECTED

I think we should push these computations back into the color strategy -- but 
I'm not sure of a good name for them. 

Oh, and in the selection manager there's another routine to apply a selection
mask, and this one does:

p.alpha() = UINT8_MULT(p_alpha, s_alpha);


-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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