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List:       kde-kimageshop
Subject:    Re: Finishing a paint action.
From:       Boudewijn Rempt <boud () valdyas ! org>
Date:       2003-10-10 5:19:09
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On Friday 10 October 2003 00:02, Patrick Julien wrote:

> > With code that does to a QImage what the image-magick based builder does;
> > create the necessary KisPaintDevice and blit that to the image; that
> > would
>
> That would be even slower.  If you want speed, you need to use the tiles
> directly.  You can actually support undo/redo with what you have here
> too... you just need to set the COW flags of the tiles before using them.
>

I've been looking at descriptions of how the Gimp works when painting, and it 
appears that they create a new image for every 'dab' -- every brush action -- 
do the brush stuff and then composite the image onto the current layer:
http://www.levien.com/gimp/brush-arch.html. So what I'm doing here seems to be 
actually pretty close.

I want to tackle undo/redo today -- first I'll try looking at how bitblt calls 
tilebitblt, but if that fails I'll go for the code from buildimage anyway. 
Or, if I get bored, I'll add line shapes, sizes and colors. Or perhaps 
implement the rest of the QPainter primitives. Or add icons for the tools. 
Or... :-)

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

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