On Mon, 2007-10-29 at 12:02 -0700, William Skaggs wrote:

> 2) Changing the implementation of gimp_draw_tool_pause() in 
> app/tools/gimpdrawtool.c, so that instead of erasing the drawing
> using the XOR trick, it redisplays the projection of the image.  I
> believe that getting this to happen efficiently will require maintaining
> a pixmap of the projection as it is currently displayed.  Given that
> that needs to happen in any case, this might be a good time to take
> on the problem of displaying an interpolated view of the projection 
> instead of the current every-nth-pixel view.

It seems you have missed quite a bit of what has happened in GIMP
development recently. GIMP displays an interpolated view of the
projection. The nearest-neighbour algorithm is not any longer used.

GIMP also maintains a pixmap of the projection, or at least something
that is very close to what is being displayed. It remains to be seen if
we need to add another level of caching there to get reasonably fast
tool drawing. It might be necessary to keep a copy of the displayed area
with all display filters applied so that tool expose events can be
served from this.


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