Re: shared pixmaps question

[Olexiy Avramchenko <ath beast stu cn ua>]

Owen Taylor wrote:

> Mostly you can't rely on shared pixmaps being present; 
But gdk_image_new(GDK_IMAGE_SHARED, ...) also can fail. On most
X desktops MIT-SHM extension exists and most applications run localy (they
can use Shm extension).

> a non-shared image acts just the same as a shared image (it's
> just slower.)
The reason why I've posted the message is perfomance. I'm developing an
application where I need to mix raw video data with text and some 2D
primitives. (1) I can put raw data in GdkImage, (2) use gdk_draw_image 
to put
it into drawable, (3) put some text/2D with gdk_draw_* functions into pixmap
and (4) use gdk_draw_drawable to put it on screen. In case of shared
image/pixmap step (2) isn't need, so there're no extra memory transfers.

> A non-shared pixmap is not at all the same
> as a shared pixmap.
Yes, but drawing primitives works fine with it. I've wrote the code I needed
and didnt see any problem.

> Regards,
>                                        Owen
> _______________________________________________
> gtk-devel-list mailing list
> gtk-devel-list gnome org
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Excuse me if question doesnt belong to gtk-devel-list, but it covers the 
library
internals and (as I think) can be interesting not only for me.

Olexiy