> I have recently recompiled my application with xforms v0.89.0, previously
> v0.88.1. The way OpenGL canvases are handled seems to have changed:
> whereas before a window could be moved across the canvas without causing
> the canvas to flicker, the same program now exhibits severe flickering,
> sometimes even displaying a black screen instead of the canvas contents.
Hm. None of my OpenGL apps exhibit this behavior. It sounds as if
perhaps Expose events aren't being handled properly or something of
that nature.
> Question: have the glcanvas class initialization or activation routines
> (as set by fl_modify_canvas_prop()) been changed from v0.88.1 to v0.89.0?
> Or is this possibly a colormap issue? The manual says that "it is a good
> idea to fill [the canvas colormap] with xforms's default colors to reduce
> flashing."
This flashing is generally only an issue if you are using color index
mode, running on a PseudoColor (generally 8-bit) device. 24-bit
TrueColor should not show these effects at all. PseudoColor displays
will go "technicolor" in a rather annoying fashion as you move the
cursor into a Window with a different Colormap.
There are a few differences but none of them as far as I can tell by
diffing them, they don't relate to fl_modify_canvas_prop().
fl_modify_canvas_prop() doesn't really do much other than set the
`init', `activate', and `cleanup' properties -- it's dumb as dirt.
The handlers themselves are in `gl.c' and I don't see any significant
difference other than some very cosmetic ones -- line breaks and the
like.
spl
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