[Development] Painting an image onto itself

[Christoph Feck]

On Wednesday 11 April 2012 00:52:33 Thiago Macieira wrote:
> The guarantees we give change how we can optimise this code. I'll
> be satisfied if we require that no single pixel is both source and
> destination.

I have seen code that do tiled fills by first blitting a source image 
(lets say 100x100 pixels) to pos (0, 0), then blitting rect 
(0,0,100,100) to (0,100,100,100), then (0,0,200,100) to 
(0,200,200,100) etc., effectively doubling the filled size with each 
blit.

-- 
Christoph Feck
http://kdepepo.wordpress.com/
KDE Quality Team