Re: [Linux-fbdev-devel] fbdev changes.

From: James Simmons (
Date: Fri Oct 18 2002 - 16:19:21 EST

> Hi James,
> Since you seem to be very busy, here's an idea for the framebuffer
> cursor API.

I looked over your patch and even tested it out. Then I thought about it a
long time. The question I had to ask myself is what do we want when we
have fbdev stand alone and fbdev with framebuffer console. Also how to use
a little code as possible (for embedded systems). So the goals are

1) For stand alone fbdev we want the maximum support for a cursor. But
   what if we don't have a hardware cursor. In this case we should leave
   it to userland to handle making it own cursor. The userland app might
   not even want a cursor. So we avoid having extra code in the kernel for
   a software cursor.

2) For fbcon the only thing we need for a cursor is a little rectangle. We
   could still use imageblit but is seems really heavy when you consider
   saving a bitmap of the current text under the cursor. True you have a
   cost at reading the framebuffer when using fillrect but doesn't it cost
   also to save the text bitmap under the cursor as well ? The question is
   which cost more.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

This archive was generated by hypermail 2b29 : Wed Oct 23 2002 - 22:00:44 EST