[REBOL] Re: Rebol on Amithlon?
From: g:santilli:tiscalinet:it at: 25-Nov-2001 13:01
Hello [holger--rebol--com]!
On 24-Nov-01, you wrote:
h> Probably because the scripts you used did not use hardware
h> scrolling, but rather rerendered all data during every
h> refresh. You can scroll by only changing the offset of a face,
h> then setting face/changes to 'offset and calling 'show. This
h> procedure significantly improves performance, by an order of
h> magnitude.
BTW Holger, is there any reason why /View can't use QUERY on faces
to see if only the offset was changed, so that the acceleration
will be automatical without the need for the developer to remember
to set the CHANGES facet?
If there's no other choice, I'd suggest a mezzanine like:
move-face: func [
"Move a face to a new offset"
face [object!]
new-offset [pair!]
/relative "Move relative to current position"
] [
face/offset: either relative [face/offset + new-offset] [new-offset]
face/changes: 'offset
show face
]
so that developers are encouraged to use hw scolling.
Regards,
Gabriele.
--
Gabriele Santilli <[giesse--writeme--com]> - Amigan - REBOL programmer
Amiga Group Italia sez. L'Aquila -- http://www.amyresource.it/AGI/
