Ah, I just read the Layer part and didn’t think of a CGLayer. You are right - a CGLayer has nothing in common. That’s what I get for reading too quickly.
On Aug 28, 2010, at 9:18 PM, Matt Neuburg wrote: > > On Aug 28, 2010, at 1:37 PM, Alex Kac wrote: > >> I believe you need to set the scale of the layer to the scale of the device. >> Here is how we do it where appContentScaleFactor is a global variable we >> store the scale from at startup: >> >> if ([[UIScreen mainScreen] respondsToSelector: @selector(scale)]) >> appContentScaleFactor = [[UIScreen mainScreen] scale]; >> >> >> if ([mainLayer respondsToSelector: >> @selector(setContentsScale:)]) >> mainLayer.contentsScale = appContentScaleFactor; >> > > Sure, but a CGLayer has no contentsScale properties (or any other > properties). A CGLayer isn't a CALayer... In fact I'm not sure they have > anything in common. m. > > > >> >> On Aug 28, 2010, at 3:22 PM, Matt Neuburg wrote: >> >>> In my UIView's drawRect: I derive a CGLayer from the current context, draw >>> into it, and then draw the layer into the context (the view). This still >>> works on iPhone with a Retina display, but the drawing is blocky. You can >>> see the problem perfectly with Apple's own example code (DrawFlag) in the >>> CGLayer Drawing page of the Quartz 2D Programming Guide - the stars in the >>> flag are blocky. >>> >>> I can work around the problem for a double-resolution screen by creating a >>> CGLayer twice the size I need, applying a doubling scale transform, drawing >>> as before into the CGLayer, and then drawing the CGLayer into my view's >>> context scaled back down again. >>> >>> But I feel I shouldn't have to do this. Given that the documentation claims >>> that "a CGLayer has all the characteristics of the graphics context [from >>> which it is derived] - its resolution, colorspace, and graphics state >>> settings," might we call this a bug? >>> >>> m. >>> >>> -- >>> matt neuburg, phd = m...@tidbits.com, http://www.tidbits.com/matt/ >>> pantes anthropoi tou eidenai oregontai phusei >>> Among the 2007 MacTech Top 25, http://tinyurl.com/2rh4pf >>> AppleScript: the Definitive Guide, 2nd edition >>> http://www.tidbits.com/matt/default.html#applescriptthings >>> Take Control of Exploring & Customizing Snow Leopard >>> http://tinyurl.com/kufyy8 >>> RubyFrontier! http://www.apeth.com/RubyFrontierDocs/default.html >>> TidBITS, Mac news and reviews since 1990, http://www.tidbits.com >>> >>> >>> >>> _______________________________________________ >>> >>> 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/alex%40webis.net >>> >>> This email sent to a...@webis.net >> >> Alex Kac - President and Founder >> Web Information Solutions, Inc. >> >> "Forgiveness is not an occasional act: it is a permanent attitude." >> -- Dr. Martin Luther King >> >> >> >> > Alex Kac - President and Founder Web Information Solutions, Inc. "I am not young enough to know everything." --Oscar Wilde _______________________________________________ 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
