I should have mentioned that my tests have been done only on Windows and
OSX.
I guess I would have to try on a system that supports XRender to compare.
Unfortunately, the target audience of our application are mostly windows and
OSX users, so although it would be great that Cairo performs fast on unix
variants, it would be of little value to us, unless of course XRender also
runs on Windows/OSX somehow :)
from the glitz page I refered to:
The semantics of glitz are designed to precisely match the
specification of the X Render extension. Glitz does not only implement
X Render features like component alpha and image transformations, but
also support for additional features like convolution filters and
color gradients, which are not currently part of the X Render
specification.
The performance and capabilities of glitz are much dependent on
graphics hardware. Glitz does not in any way handle software
fall-backs when graphics hardware is insufficient. However, glitz will
report if any requested operation cannot be carried out by graphics
hardware, hence making a higher level software layer responsible for
appropriate actions.
Glitz can be used as a stand-alone layer above OpenGL but is also
designed to act as a backend for cairo, providing it with OpenGL
accelerated output.
That's why it would be good to know whether glitz is still supported
(and compatible with current cairo): it, or something like it, would
provide direct access to hardware-accelerated cairo functionality on
all OpenGL platforms (without the current Haskell-land dependency
of cairo on Gtk2hs; though software fallbacks for missing hardware
support would seem essential).
Claus
|There seem to be some older references to an OpenGL backend for Cairo
|
| http://www.cairographics.org/OpenGL/
| http://www.freedesktop.org/wiki/Software/glitz
| http://www.usenix.org/events/usenix04/tech/freenix/nilsson.html
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