cramps features decompression in-memory in place and to avoid copying data you can put uncompressed TIFF in it. cramfs decompresses into NSData objects in-place and can be taken up directly by NSImage/UIImage/CGImage/CIImage object. cramfs variant that is based on zlib makes that image a equivalent of PNG format.
On Apr 9, 2014, at 17:29, Uli Kusterer <witness.of.teacht...@gmx.net> wrote: > On 09 Apr 2014, at 07:22, dangerwillrobinsondan...@gmail.com wrote: >> Base64 encode images into one file. It could even be an SQLite db file. > > I’d recommend against base64-encoding possibly large binary data like image > files. base64 makes it balloon in size. It’s fine for storing small binary > bits like bookmark data (i.e. aliases) or NSDates in an Info.plist or XML > file, but if there are enough images to cause running out of file > descriptors, they are enough images that the overhead of base64-decoding will > be relevant. > > I worked on a project where we used to store a (comparatively small, ~700x500 > pixels) preview of a JPEG file in a plist file as NSData. Even then we > realized that decoding of this data was a big bottleneck for load times when > showing a list of all these previews. We eventually switched to a separate > image file and had a large benefit. Later when the previews needed to become > larger, this saved our bacon. Given most common image formats these days are > compressed already, anything beyond a tarball probably hurts more than it > helps. > > Now admittedly, we also gained the ability to not have to load the image file > just because we needed some other key from the plist, but just moving the > data from a hard disk over the bus can be a bottleneck, not even mentioning > having to process each byte (and thus copying it again). Especially since > that’s just to get the raw JPEG data, which is then decompressed and thus > “copied” again. > > Cheers, > -- Uli Kusterer > “The Witnesses of TeachText are everywhere...” > http://zathras.de > > > _______________________________________________ > > 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/xcvista%40me.com > > This email sent to xcvi...@me.com
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