[maemo-developers] Can GTK+ make use of XSHM extension from MIT

[From: Eero Tamminen]

Hi,

ext Bin Chen wrote:
> I am not doing very detailed profiling against this, but by comparing
> the frame rate in my player against using pure framebuffer
> implementation. The performance difference is large. If not using
> shared memory to transfer the decoded image data, obviously the
> performance can't be good in slow machine.
> 
> The GTK+ can draw pixbuf and image to the drawable, is there any
> existing method for me to choose to force the low level gdk to use SHM
> extension?

If you have a local connection to X server it uses that
(where it helps, setting up XSHM has its own overhead).

Gdk handles images internally as 32-bits, the display is 16-bits.
Conversion is done automatically when needed by Gdk.  Need I say
more?

It sounds like your use-case would be more appropriate to be done
with libSDL (which also does automatic conversions, but can handle
surfaces in display bit-depth if you've just asked it to do that).


	- Eero