Re: fast blitting with Quartz
Re: fast blitting with Quartz
- Subject: Re: fast blitting with Quartz
- From: Alastair Houghton <email@hidden>
- Date: Fri, 28 Sep 2007 20:47:10 +0100
On 28 Sep 2007, at 17:28, Kenny Leung wrote:
In the old NeXTstep days of pswraps, there was this cool PostScript
operator called "composite" that would blit bits in the current
graphics context. So if you were doing a scrolling chart, you would
just have to composite the 99% of stuff you already had on-screen,
and draw the 1% of new data.
Question 1: Does anybody know of the current Quartz equivalent for
doing this? I image that the NSScrollView/NSClipView combination
knows how to do this, but I have not been able to find the function
to do it.
You probably want NSView's -scrollRect:by:.
Kind regards,
Alastair.
--
http://alastairs-place.net
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