[cairo] which operations modify the canvas?
cworth at cworth.org
Wed Jun 20 10:56:34 PDT 2007
On Wed, 20 Jun 2007 19:21:00 +0200, Tamas K Papp wrote:
> I think I will just call XSync when needed. For this, I need a
> complete list of operations that modify the "canvas". Here is what I
> have come up with (dropping cairo_):
These are correct:
These are not, (they measure things without drawing):
> Did I miss anything?
Yes, show_text and show_glyphs are the other drawing operations that
you missed. I think that should be everything. There really are just 5
drawing operations in cairo:
mask, paint, fill, stroke, and show_glyphs
but there are a few variations of those as you discovered above.
> For future developments, it would be ideal if I could attach a
> callback function to the surface or context (whichever is easier) that
> would be called (with a pointer to user-suppled data) whenever actual
> drawing happens. Would this be feasible?
Anything is possible, really. But I'm a bit confused as to what
problem you are running into. You really shouldn't be needing to call
XSync to get results to appear, (and if you are, I fear negative
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