[cairo] After 'set_line_width', subsequent stroking is slow [ Background image]

Olivier Jolet olivier.jolet at skynet.be
Wed Feb 21 00:03:13 PST 2007

> On 2/20/07, Olivier Jolet <olivier.jolet at skynet.be> wrote:
> > Also, I have another problem of performance, if I use the
> > 'cairo_set_line_width' primitive, it is very much slower. I don't
> > understand why there is a such difference?
> Neither do I. I don't think I'm understanding you. Do you mean that
> when you call set_line_width, all subsequent stroking is slower than
> when you don't? Obviously the call to cairo_set_line_width itself is
> really fast, so I don't think you're referring to that.

Yes, I think it's exactly that. When I do not call set_line_width, all
subsequent stroking is faster.

> > It's a little complicated to provide the code + data because it is
> > on a greater real time application.
> Understandable. You could try capturing the data from a given run,
> which would allow one to later replay the drawing without the need for
> the full application. You already have all your drawing code
> centralized in that small interpreter, so adding some logging
> capabilities shouldn't be too painful. Come to think of it, you could
> probably easily write out all that drawing data you already have in
> that dlbuf variable I saw in your code.
> Dan

I will try.


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