On Thu, 12 Jul 2007 11:35:25 -1000, Eric Firing wrote: > Carl Worth wrote: > > > It sounds like something that should be really easy to change in > > cairo. > > Yes, so much so that I don't understand why it is not already done. (I > know you are a cairo dev--is there not a postscript specialist in the > cairo dev community?)
Honestly, there just plain hasn't been much demand for it. We do have
several very competent PostScript specialists in the community. I
would expect that if you floated the idea on the cairo list, (and
maybe pointed out a particular missing issue), the problem could get
solved very quickly.
Later, you said...
> Aha! Cairo ps output is full of "initclip" commands, so it can't be
> converted to eps without substantial reworking.
Oh, actually that should be really easy to get rid of. The cairo
semantics match PostScript's very closely:
cairo_clip -> clip
cairo_reset_clip -> initclip
So, the only problematic case is if the application is actually
calling cairo_reset_clip, (which could simply be made into an error
when targeting EPS). If the application isn't, and cairo is still
generating initclip in the PostScript output then it should be very
simple to fix that.
> Well, I think that for screen display and for png generation, Agg is
> significantly faster. Backend_driver.py gives
>
> Backend agg took 0.76 minutes to complete
> Backend cairo.png took 0.95 minutes to complete
> Backend template took 0.46 minutes to complete
Ah, thanks. So there's definitely some work to be done there. Does
anyone know a list of any optimizations that are specific to the AGG
backend, but could in fact be general. (The recently discussed culling
of geometry outside the visible region comes to mind for
example---that wasn't generalized was it?).
And I do understand that the proposal for reworking the backend
interface is to help with concerns like this.
Anyway, I'll try to get setup to profile the cairo run above and see
if any obvious things stick out that could be easily fixed.
-Carl
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