Iterator

[Cyrille Berger]

Hello,

While working on optimizing and finishing KisConvolutionPainter, I found out 
(that maybe not new) that we lost a lot of time in creating iterators, this 
is much a problem for KisVLineIteratorPixel and KisHLineIteratorPixel, as you 
need to recreate the iterator each time you change the line. I think we might 
expand them with two new functions :
KisHLineIteratorPixel::nextRow go to the next row
KisVLineIteratorPixel::nextCol go to the next col

(note that the behaviour would be quiet different from KisRectIterator)

What do you think ?
-- 
--- Cyrille Berger ---