bicubic interpolating zoom

[Michael Thaler]

On Monday 16 August 2004 18:26, Adrian Page wrote:

> That's probably because you're calling readPixelData() four times instead
> of once. That's a slow function because of the underlying tile system. It
> should be faster using iterators, although they're not finalised yet.

The best thing would be to read a whole line at once. The Gimp is doing that. 
(Actually I think you need two lines).

> There is something wrong with the old method. If you scale a 512x512 to
> 400x400, painting on the scaled image acts strangely. There seems to be
> some sort of problem with the tiles.

I think so, two. I did not really modify anything that has to do with 
painting. And the black squares look like certain tiles are not handled 
correctly.

Greetings,
Michael