Easy layer access for rgb8 filters.

[Boudewijn Rempt]

On Monday 17 January 2005 13:34, Casper Boemann wrote:
>
> I might be able to make an exact fit if we believe that an iterator is
> always walked all the way through. That way I could update the extent
> whenever an iterator is created. My first thought of an exact fit was to
> update the extent whenever the iterator moves a single pixel (thus the huge
> overhead I feared). Should I do this ??
>

No, I don't think so... I think it's time for some decisions. All paint apps 
and image editors I've tried behave differently in this regard, so we are 
safe if we can just set down the way Krita behaves. My preference is the 
following:

* New layers cover the entire image by default -- this is meaningless if you 
have transparent pixels, but if you have a background colour, then it becomes 
important because we must fill those pixels.

* If you move a layer and paint outside the previous layer extent, the layer 
will be extended automatically (with background pixels?).

* Filtering. Filters only cover the actual tile extent of the layer that has 
been painted on. I don't think this would hit performance much.

* Filling (all types, including gradient, patterns and rendering filters) 
fills the layer within the image bounds. A layer that has been moved will be 
extended to cover the entire image.

Finally, I'd like to add a function that returns the exact extent ()-- this 
one is going to be expensive to call, but it shouldn't be necessary often, 
mostly for use with selections. This would iterate over the border tiles to 
determing the the extact extent.



-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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