Re: [AGG] RE: image-filtering bug

[Maxim S. <mcs...@ya...>]

> > It looks exactly like you use pixfmt_nnnn instead of pixfmt_nnnn_pre.
> > http://cyphre.mysteria.cz/tests/agg-bilinear-1-result.png
> > http://cyphre.mysteria.cz/tests/agg-bilinear-2-result.png
> > They should look the same, without the gray border in the first image.
> 
> Hmm, this is really strange as I'm actually using the pixfmt_nnnn_pre:

I tried to reproduce your picture and it works as expected.
http://antigrain.com/stuff/image_filters2.zip (compiles with pilot agg-2.4)
http://antigrain.com/stuff/image_filters2.png

Maybe you blend layers (blend_from() function)? If so, the destination pixel
format must also be premultiplied.

Also, it might be something wrong with the inverse alpha channel you use.

McSeem



		
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