Re: [Matplotlib-users] 2 newbie questions: redraw plot and access to raw image buffer

[Darran E. <da...@ed...>]

Michael Droettboom wrote:
> I'm assuming you're using the Agg backend.  If so, you can get the raw 
> memory wrapped in a Python buffer object as follows:
>   figureCanvas.get_renderer().buffer_rgba(x, y)
> (where x, y is the upper left corner in the plot of the area you want to 
> get.)  It should be possible in C side to then get the address out of 
> that using the Python/C API.

Hi Mike.  I am using the above API call.  What I'm hoping to avoid is 
having to copy this buffer to a ctypes buffer.

buff = figureCanvas.buffer_rgba(0,0)
cbuffer[:] = buff[:]  ## would prefer to eliminate this step
address = ctypes.addressof(cbuffer)
ptr = ogre.CastVoidPtr(address)

This question probably belongs on the pythonOgre mailing list.  Thanks 
though.

Cheers,
Darran.

-- 
Darran Edmundson [da...@ed...]
http://www.edmstudio.com