Re: Memory used by a UIImage?
On Mar 4, 2011, at 8:17 PM, Rick Mann wrote: Unfortunately, if I create the image from a PNG, it's possible iOS stores it compressed, and only decompresses when rendering. I'd like to know how much it's using at any given moment. If you create the UIImage with the withContentsOfFile APIs, then we'll reference the file for image data when necessary and may or may not be loaded into memory (generally it won't be). If you use the withData APIs, then the compressed data is always in memory. Using the withCGImage APIs will depend on how you created the CGImage itself. But if you are trying to figure out your memory usage, it is better to use the VM Tracker instrument (part of the Allocations template). You'll have to turn on automatic sampling or press the sample button yourself to get data, but watching the Dirty Size statistic is what you are interested in here. -- David Duncan ___ 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
Re: Memory used by a UIImage?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 3/4/11 2:18 PM, Rick Mann wrote: Is there a way to determine how much memory a given UIImage is using for the in-memory image data? Shot in the dark: access its CGImage to get the the underlying CGImageRef, then use the CGImage functions to calculate the size? - -- Conrad Shultz Synthetiq Solutions www.synthetiqsolutions.com -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iD8DBQFNcW3uaOlrz5+0JdURAlrtAJ9osY3/iIOgdYECfub4qOkKmTXjywCeKhPh pNLs+rj6AnOY0dQ7bT/xuDI= =SPV4 -END PGP SIGNATURE- ___ 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
Re: Memory used by a UIImage?
I doubt you could find out *exactly* how much memory is being used. You could probably get an approximation by multiplying pixelHeight * pixelWidth * 4 (assuming A, R, G, B channels), since the image bitmap is likely to be the biggest chunk for images of any real size. On Mar 4, 2011, at 2:18 PM, Rick Mann wrote: Is there a way to determine how much memory a given UIImage is using for the in-memory image data? ___ 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
Re: Memory used by a UIImage?
Unfortunately, if I create the image from a PNG, it's possible iOS stores it compressed, and only decompresses when rendering. I'd like to know how much it's using at any given moment. Thanks, though. -- Rick On Mar 4, 2011, at 20:14:26, Steve Christensen wrote: I doubt you could find out *exactly* how much memory is being used. You could probably get an approximation by multiplying pixelHeight * pixelWidth * 4 (assuming A, R, G, B channels), since the image bitmap is likely to be the biggest chunk for images of any real size. On Mar 4, 2011, at 2:18 PM, Rick Mann wrote: Is there a way to determine how much memory a given UIImage is using for the in-memory image data? ___ 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
