On 8 Oct, 2009, at 01:19, Greg Guerin wrote:
Colin Howarth wrote:
I don't know enough about what Quartz is doing. For instance, does
it calculate the coverage
of a pixel (i.e. the fraction covered) as a float and then use that
times 255 for pixel values
(for black on white) giving 256 steps. Or does it quantize down to
16 steps, for example?
I expect it's using a double and compositing with alpha blends and
all the rest :-)
First, it's usually doing sub-pixel anti-aliasing. Run the
DigitalColor Meter app in /Applications/Utilities. Second, the type
and amount of anti-aliasing it does is determined by the OS
version. 10.6 has different defaults and options than 10.5 or 10.4
(e.g. the smoothing options in the Appearance prefpane). Finally,
it's conceivable that anti-aliasing is done by a GPU. Again,
support for that would depend on OS version.
I'm using OS X 10.6.1 on a MacBook Pro (ie. nVidia 9400M and 9600M GT
chips, with the 9600 enabled).
So to reiterate what Ken Ferry wrote, there's too much information
missing.
I posted a couple of little screen shots (which compressed nicely to
16k and 30k or so) to the quartz-dev list.
I got an automated reply that they're awaiting moderator approval (for
having gone over 20k).
Probably, if and when the images are posted, someone will say, "aawww,
they're fine. What are you complaining about?"
--colin
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
