>> Am I right with my assumption, that under fltk (1.1.9) there is no
>> transparency-support for XPM-Pictures?
This example:
http://seriss.com/people/erco/fltk/#DraggableBoxes
..shows transparency under 1.1.x with xpms.
All the '#' signs are mapped to 'None' which means
that portion of the image will be "see through"
exposing whatever's underneath.
But 1.1.9 doesn't support full 8 bit alpha; you can either
see the image 100%, or you see through to the background 100%..
no blending.
In 1.3.x you have full alpha for images like pngs,
so you can have images with nice anti-aliased edges
that fall off into the background.
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