[PD] gem - pix_buffer strangeness

B. Bogart ben at ekran.org
Wed Mar 9 18:25:22 CET 2005

Hey there,

I don't have time to look at your patch but I have some ideas.

I guess your mixing still images?

the BEST way to do this in Gem is to make a different square/rectangle for
each image and stack them on top of one and other then gemhead 1 in the
back and gemhead N in the front. Then you just use the alpha blending to
make the mix. This is much more simple, much easier, and way way more

Let me know if this approach does not work for your concept.


> hi list -
> It would be really great if someone could shed some
> light on this issue.
> i'm trying to merge some pics with the pix_composite
> object. now, instead of using [t a a a a a ...] and
> (numberofpics - 1) pix_composites (simply enough - got
> it to work), i tried to do it in a less clumsy and
> cpu-demanding way by using pix_buffer. my idea was to
> read all images into a buffer first (say, into slots
> 0-7) and mix them afterwards (using slot 8). The
> actual mixing would be some sort of iteration: first
> the images in slot 1 (left inlet of Pix_composite) and
> 0 (right one) will be mixed into slot 8. Afterwards
> slot 2 (left) and slot 8 (right) are mixed to slot 8,
> the same would be done with slots 3 to 7 ...
> This actually works, the only drawback is that the
> mixed pics are not only written to slot #8, but to the
> currently processed slot as well. Although the only
> pix_buffer_write object in the whole patch gets an [8(
> banged to its right inlet everytime a render cycle
> occurs.
> This sounds probably a bit confusing ... please have a
> look at the attached patch, that should make it more
> obvious.
> thank you in advance,
> thoralf.
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