A new class: KisAlphaMask

[Boudewijn Rempt]

I'm progressing as swiftly as I'd like (mainly because I'm not good enough in 
C++ to recognize that if the compiler complains really bitterly, I've 
probably made a copy-pasto, and because I'm stodging through C++ in a 
Nutshell), but the brushes now cache their alpha mask using a new class,
rather appropriately named KisAlphaMask (or should that have been 
KisBrushAlphaMask?). 

Anyway, painting is a little less cpu-intensive now, since I don't calculate 
the brush mask for every dab, and I've started on adding support for scalable 
brushes (useful with pressure sensitive tablets -- only I needed a new kernel 
for security reasons, a new Qt for KDE 3.2 beta, so I have to spend a day 
getting the tablet working again), and I've started on making the brush tool 
feature complete. More tomorrow, I hope.

Meanwhile, I think I will have to break my vow not to add another tool, and 
collect my silly mistakes in a KisToolSilly tool, because my 
kids^Wbeta-testers think Krita is getting less fun with every patch...

A very happy new year to everyone who happens to read this, too!
-- 
Boudewijn Rempt | http://www.valdyas.org/index2.html