[cairo] basic question?

[Charles سمير Doutriaux]

Hi David,

Actually, speed is not the only issue, the way our software is  
designed there's a LOT of polygons to fill and it is more pleasant to  
the user to see the image pop up finished instead of looking at it  
being drawn.

Beside I already implemented this via Qt (one more layer on top of  
X11...) and the rendering did seem much faster if done on a  
cairo_image_surface brought back up by Qt than if it was done on a  
cairo_X11_surface. But then again it could be just optical illusion...  
I won't get into benchmarking issues.

C.

On Aug 18, 2009, at 1:54 PM, David Björkevik wrote:

> Charles,
>
> Charles سمير Doutriaux wrote:
>> For speed reason I'm thinking it would be better to draw "in memory"
>> on a cairo_image surface and then whenever I need to update copy the
>> image back to my X11 window.
>
> This is not correct. When drawing through X, cairo uses XRENDER  
> which is
> hardware accelerated (if your X driver supports it).
>
> /David