Re: Efficient image drawing

["John Cupitt" <jcupitt gmail com>]

On 4/27/06, Paul Davis <pjdavis engineering uiowa edu> wrote:
> I'm developing a video playback app and I'm a bit curious to see if
> there's a better way to render images to the screen.  As it is now I'm
> using the Gtkmm objects and copying images from my non-standard format
> in a GdkPixbuf and then drawing to a GtkDrawingArea using
> gdk_draw_rgb_image_dithalign.
>
> Admittedly, this method is fairly fast.  I'm getting between 15 and 20
> fps on my development machine which is only a 1.4 GHz.
>
> I'm just wondering if anyone knew a more efficient method to get image
> data from disk to the screen.  Any suggestions are welcome.

I think gdk_draw_rgb_image_dithalign() is about as fast as you can get
while staying within the world of gdk. I avoid a copy by having my
non-standard format be 24-bit RGB and drawing directly from that, but
that's it I think.

I don't know if gdk_draw_rgb_image_dithalign() uses the XVideo
extension, but I imagine not. Of course using that ties you to X.
Maybe Cairo with a GL backend would be quicker? Though it'll be a
while before that is a common target :)

John