Re: gdk pixbufs, rgbbufs, efficiency, painting onto them

[John Cupitt <jcupitt gmail com>]

Hi,

On Mon, 29 Nov 2004 20:40:23 -0000, cali <calculus softhome net> wrote:
> Another problem I face is that I can't find any plotting routines for a
> gchar buffer, does anybody know any decent ones?

Have you tried gdk_draw_rgb_image() and gdk_draw_gray_image()? They
draw an RGB or greyscale buffer to the screen as quickly as possible.
On my (rather modest) machine with no h/w accelleration I get >30
megapixels / sec. There's a benchmark program in
gtk+-2.4.x/tests/testrgb.

> I find it really strange that GTK doesn't provide a drawable surface that
> also allows direct access to pixel values, i.e for maximum client side
> efficiency, I mean, I don't need any of this server side stuff.

GTK is (fairly) portable, so its drawing functions have to be quite
high-level. As another poster said, ogl is probably a better API for
fast graphics. There's a GTK widget which displays an ogl surface in a
window.

John