On 2/16/2013 5:20 AM, Phileas Fogg wrote:
Hi,
i have a question about how the scrolling in a framebuffer syscons works.
I'm trying to speed up the syscons on the PS3 console which is a
simple framebuffer syscons.
It uses the renderer _gfbrndrsw_ (see dev/syscons/scgfbrndr.c) to draw
into the framebuffer of the PS3 console.
The _gfb_draw_ function implements a simple scrolling that moves data
from bottom to top with _vidd_copy_.
And that's where i have a problem because _vidd_copy_ calls the
function _ps3fb_copy_ (see powerpc/ps3/ps3_syscons.c).
But the function _ps3fb_copy_ is NOT implemented yet. So, the question
is how does the scrolling work then ?
I took a look at other syscons implementation based on a framebuffer,
and almost all of them do NOT implement _vidd_copy_
function, e.g. XBOX syscons.
I think driver re-renders whole screen character by character. That's
why no copy operation is invoked.
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