[haiku-appserver] Re: another issue. ClipToPicture.
- From: Adi Oanca <adioanca@xxxxxxxxxxxxx>
- To: haiku-appserver@xxxxxxxxxxxxx
- Date: Sun, 31 Oct 2004 23:03:43 +0200
Stefano Ceccherini wrote:
>>Well, in a drawing model that was a little better defined, in terms
>>of
>>hit-rules, etc. these could be done in a number of ways... generating
>>paths from the primitives and then using path-based clipping, for
>>example.
>>
>>The BeOS drawing model was never unified enough to be able to do
>>something like this, so ClipToPicture instead draws into a special
>>"accelerated" canvas that takes the pixel spans that are generated
>>and
>>converts them into BRegion rectangles and merges them with everything
>>that has been drawn thus far. That BRegion (or its inverse) is then
>>used to clip the drawing.
>
>
>>Thoughts, guys?
>
>
> Hey, that's what I thought as well :P
> BTW, if doing lots of "BRegion::Include()" turns out to be too slow, you can
> do some magic tricks :)
> As I said, BView is a friend of BRegion, so you can add the pixel to the
> BRegion data manually, then call BRegion::Support::SortRects() and
> CleanupRegion()...
OK, we seem to have the answer.
>
> Anyway, if you're interested I can go deeply into the subject.
Yes, please.
Of course, it would be of big help if you can do this for app_server.
:-) ;-)
Thanks,
Adi
Other related posts:
