drawing an RGB bitmap or pixbuf

[Matt Hull <mhull1 uic edu>]

I am new to gtk and trying to draw a bitmap to the screen.  the bitmap is
about 200 by 300 pixels with 8 bit rgb, total is 24 bits.  alpha is
optional at the moment.  for now it is 0xff.  i have tried many different
examples from the internet but none seem to work.  can anyone give me an
example ?  maybe just draw it once to get me started or put it in a timer
loop to be called when idle ?

thanks, matt