On 10 Aug 2012, at 09:09, Fulbert Boussaton <4...@flubb.net> wrote: > Hi everyone, > > on iOS, I was using the following "immediate CG code" to display hundreds > procedural sprites : > > CGContextSetShadow(Ctx, CGSizeMake(3, 4), 3.0f); > CGMutablePathRef ShapePath = CGPathCreateMutable(); > CGPathAddArc(ShapePath, &CGAffineTransformIdentity, radius+3, radius+3, > radius, 0, deg2rad(360), YES); > CGContextSetStrokeColorWithColor(Ctx, [strokeColor CGColor]); > CGContextSetFillColorWithColor(Ctx, [fillColor CGColor]); > CGContextSetLineWidth(Ctx, strokeWidth); > CGContextAddPath(Ctx, ShapePath); > CGContextDrawPath(Ctx, kCGPathFillStroke); > CGPathRelease(ShapePath); > > Ctx is the current context and the sprite is a filled circle with a shadow. > > Of course, an iPad was *really* slow to draw all of these, even if each one > represents 32px * 32px. So I optimized it using CGLayerRef stored in a > NSdictionary and, yes, it was a lot faster. > > But still, it's not really satisfying, and I'm sure something better can be > done. Do any of you got any idea ? I'm kind of stuck in the CG documentation. > Is there a book specifically dedicated to CG optimisation ? (I know a WWDC 12 > presentation talks about CG optimisation but haven't had time to spare yet).
So you have a performance problem. You used Instruments to diagnose it, yes? What did you learn? _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
