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- Path: sparky!uunet!pipex!demon!cix.compulink.co.uk!hallan
- Newsgroups: comp.sys.next.misc
- From: hallan@cix.compulink.co.uk (Hugh Allan)
- Subject: Help!
- Reply-To: hallan@cix.compulink.co.uk
- Date: Mon, 11 Jan 1993 19:38:00 +0000
- Message-ID: <memo.856984@cix.compulink.co.uk>
- Sender: usenet@demon.co.uk
- Lines: 23
-
- I think I understand NXImages, but I'll tell you because you
- understand these things.
-
- I have an App, FLI-Play, which displays generated bitmap data. The
- source image is data in VGA format, you know the sort of thing, 256
- colour palette from 1/4 mil colours. So I take this data and convert
- it to a 24 bit NXBitmapImageRep and drawAt the changed data to
- screen. All fine so far. The problem is it's just so damn slow, the
- transfer rate (NXPings are used to provide non jerky animation), is 2
- to 8 frames to second, which is pretty lousy. 70 frames per second is
- what I want really as the player can display more than FLI, so faster
- the better.
-
- I could make some improvements to the change optimization, but I
- still won't get any better than a two times speed up I imagine. What
- I could so with is a postscript context to composite from, but as I
- understand it, what NXImages so is draw into an offscreen cache, and
- use that for compositing later. I only use the image once, so this is
- no use to me. I'm a bit stuck.
-
- I'm using a NeXTstation colour non-turbo.
-
- --- Hugh
-