kis_tool_brush

[Boudewijn Rempt]

I've ported kis_tool_brush (still identified by nice white sheet of paper icon 
in the toolbar) to the new tool archtitecture. I've also added a compositing 
mode especially for painting: COMPOSITE_NORMAL, which doesn't increase the 
transparency every time an image with transparent pixels is composited, so 
now the brush is a real painting brush, instead of a bad imitation of 
wet-in-wet tempera painting :-).

There are still a few problems, though.

First with my implementation of the brush: I don't cache masks, which makes 
painting too slow, and I don't do undo/redo yet, and no pressure sensitivity 
and a host of unimplemented issues.

Second, there's still something quite wrong with the way we handle tools, 
canvas updates and multiple views. Experiment with it; open an image, open a 
new view, and start painting here, and there and everywhere...

-- 
Boudewijn Rempt | http://www.valdyas.org/index2.html
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