Re: fast blitting with Quartz
Re: fast blitting with Quartz
- Subject: Re: fast blitting with Quartz
- From: Kenny Leung <email@hidden>
- Date: Sat, 29 Sep 2007 08:26:24 -0700
Yes! Exactly what I want.
Thanks!
-Kenny
On Sep 28, 2007, at 12:47 PM, Alastair Houghton wrote:
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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