> My intention is that nano-X is doing anywhere twice a malloc 
> to reserve
> memory for the picture. I don't know where.

You do, of course, realise that issues with nano-X are outside the remit
of this forum.

At this point, it is now "traditional" for me to pitch in a recount some
tale of woe about my experiences using nano-X.

Suffice to say, I did not find it very effective.
If your hardware can support it, I'd strongly advocate looking closely
at a kdrive/tiny-X solution instead...


> I think a solution for the
> problem is to load the picture in many tiles. I searched 
> therefore in the
> docs and I found Fl_Tile_Image. Is this suitable or do I have 
> to write my

No, that does the wrong thing for you - it tiles the entire window with
one small image, e.g. for filing in a textured background or etc.

> derived class "picturebox" which draws the picture in tiles?

This might work, or you might be able to draw the image data into the
Fl_Box yourself in a way that is more efficient than what is currently
happening.

> And is there any hint to do so?

Not as such.
This how-to touches on some of the issues, so there might be something
there that helps, but it does not address the issue of "tiling" your
data.
I'm not sure that tiling will necessarily help, either, unless you can
ensure that each small tile is released before the next one is
allocated, or something...

http://www.fltk.org/articles.php?L468 




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