<div dir="ltr">Yes, I do wonder if I'm falling off of the slow path.  Unfortunately the whole rendering system is a bit .. sprawling, and impractical to show everything.  I'll try to show the relevant calls though. For clipping, we are using cairo_rectangle/cairo_clip, with aligned coordinates (although I need to verify that the alignment is working, I suppose).  When rendering the text, here's what the code looks like:     cairo_set_operator cr, CAIRO_OPERATOR_OVER);     cairo_set_source_rgba(cr, red, green, blue, alpha);     pixel_align_for_fill(cr, &x, &y);     cairo_set_font_size(cr, font_size_pixels);     maybe_throw_cairo_error(cr, "cairo_set_font_size");     cairo_move_to(cr, x, y);     cairo_show_text(cr, str_as_utf8); For my testing, I haven't set any other text properties, so it's the default font face & options.  Alignment is handled by transforming to device, rounding to integral values, and transforming back to user space. (I wouldn't be surprised if my method of getting the results on-screen is also a bottleneck, since the app is double-buffered and I haven't done any performance testing of the copy yet.  But right now I'm measuring the text rendering itself.) I really hope there's something I can do, because Cairo is, in all other respects, awesome.  It's the best 2D API I've ever used, easily. Thanks for your time, Damian <div class="gmail_quote"> On Tue, Aug 26, 2008 at 5:23 AM, Gerdus van Zyl <<a href="mailto:gerdusvanzyl@gmail.com">gerdusvanzyl@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Please see this discussing on the list: <a href="http://lists.cairographics.org/archives/cairo/2008-February/012982.html" target="_blank">http://lists.cairographics.org/archives/cairo/2008-February/012982.html</a> The reason I saw slow rendering was with the way I did double buffering and the type of surface I created. If you could show us your text rendering code it would be informative. ~Gerdus <div><div></div><div class="Wj3C7c"> On Tue, Aug 26, 2008 at 11:40 AM, Nicholas Allen <<a href="mailto:allen@ableton.com">allen@ableton.com</a>> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > I also experience serious performance problems with Cairo. I have only > run on Windows but it's performance is so bad as to make it completely > unusable for what we need. It's a shame because the API is really > clean and the output looks great. Hopefully, this will get fixed in > future releases... > > Nick > > Damian Frank wrote: >> I'm pretty new to Cairo, and I've been looking at using it for a >> codebase that currently uses, variously, Xlib, GDI, GDI+, and >> Quartz, among others.  Performance is one of my chief concerns, >> though.  At the moment I'm looking at text performance, and I have >> some serious concerns.  For now, I am just benchmarking on Windows, >>  and only for to-screen rendering (as opposed to printing or >> PS/PDF/etc). >> >> Can someone give me some pointers on staying on the fast code paths >>  for text rendering on win32?  My tests so far show image and DDB >> both taking about 15-20x as long as our GDI implementation, and >> 24-bit DIB taking about 5x as long. >> >> Thanks, >> >> Damian >> >> >> ---------------------------------------------------------------------- >> >> >> _______________________________________________ cairo mailing list >> <a href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> >> <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.7 (MingW32) > Comment: Using GnuPG with Mozilla - <a href="http://enigmail.mozdev.org" target="_blank">http://enigmail.mozdev.org</a> > > iD8DBQFIs8+jbpmWsXfOU58RAhUdAJ9ZvO339sJmJFpaIKaTLDbHEATLngCeK9zT > AoOUaWptYxAJZE5kIii1Whc= > =kDzx > -----END PGP SIGNATURE----- > </div></div>> _______________________________________________ <div class="Ih2E3d">> cairo mailing list > <a href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> > <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> > </div>_______________________________________________ <div><div></div><div class="Wj3C7c">cairo mailing list <a href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> </div></div></blockquote></div> </div>