Painting on a temporary layer

[Bart Coppens]

Quoting Boudewijn Rempt <boud at valdyas.org>: 
> What I wonder, though, is why it makes a difference when we already have a  
> temporary layer in the paint ops. If I understand it correctly we have 
> always used the following 
> Which with temp layers becomes: 
Yes, that's exactly what I tried to change. 
 
> I think I see... You shouldn't take already filtered data in step 3, but the 
> original data. But even after step 3 in the original process, we still have  
> the original unfiltered data. But it's hidden in the undo information. If we 
> had a way of taking data during paint from the layer state before we started 
> painting, instead of from the affected tiles, we wouldn't need a temporary  
> layer. 
I thought of that, too, but as you say it feels a bit hacky. And before I try 
that at least the basic idea has to work before the hacking can start. 
 
> > > KisView::updateCanvas() ? 
> > I'll try that, thanks for the idea. 
> I took a look at the code KisView uses to add a new layer, and that seemed 
> one of the significant differences. 
Unfortunately, adding 
m_subject -> canvasController() -> updateCanvas();  
doesn't seem to make a difference :( 
 
Bart Coppens