Re: Accelerated frame buffer functions

James Simmons
2005-02-02T19:34:43Z

> > Le mercredi 02 février 2005 à 15:21 +0100, Haakon Riiser a
> > écrit :
>
> >> How can I use a frame buffer driver's optimized copyarea,
> >> fillrect, blit, etc. from userspace? The only way I've ever
> >> seen anyone use the frame buffer device is by mmap()ing it
> >> and doing everything manually in the mapped memory. I assume
> >> there must be ioctls for accessing the accelerated functions,
> >> but after several hours of grepping and googling, I give up. :-(
>
> > Did you try DirectFB ?
>
> Thanks for the tip, I hadn't heard about it. I will take a look,
> but only to see if it can show me the user space API of /dev/fb.
> I don't need a general library that supports a bunch of different
> graphics cards. I'm writing my own frame buffer driver for the
> GX2 CPU, and I just want to know how to call the various functions
> registered in struct fb_ops, so that I can test my code. I mean,
> all those functions registered in fb_ops must be accessible
> somehow; if they weren't, what purpose would they serve?

The reason for the accelerated functions is for the framebuffer console.
Drawing pixel by pixel is to slow.