clip masks/simulating transparency

Mag. Dr. Nikolaus Klepp office at
Tue May 31 00:29:48 PDT 2011


I just wanted to say that I love the idea of what you are doing. If I get it 
right, xpenguins would then work with any DE (KDE/Gnome) without erasing the 


Am Dienstag, 31. Mai 2011 schrieb Amy C:
> Hi all,
> I've sort-of worked it out (I think??) but would still like suggestions on
> this.
> The penguins -are- being drawn using the clip mask correctly onto the
> window of my choice.
> The problem was that each penguin comprises a little animation (penguin is
> moving), and the expose event was only being sent once per animation, not
> after every single frame of the animation. Since the penguins move only a
> few pixels per animations (say 20 or so) it looked like the clip mask just
> wasn't working.
> I've modified the code to send an expose event after each frame of the
> animation is drawn (so truly after each penguin is drawn), but now (as
> expected) it looks very very flickery -- every cycle we get a XClearArea
> where the old penguin was, an XExposeEvent where the old penguin was, and a
> XCopyArea of the next frame of the animation.
> Can anyone think of an alternative way to do this (have the penguins walk
> over a screen of my choosing and restore said window after they've passed
> through, without too much flickering?) -- perhaps I can copy the relevant
> bit of background as the background of the penguin pixmap itself, although
> I think I'd need to send an XExposeEvent before I can grab the background?
> [So close! Soon I shall have penguins taking over my windows! SOON! bahaha]
> cheers
> Amy

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