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 > > > > _______________________________________________ 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
