Re: Reading NSData from a file
Re: Reading NSData from a file
- Subject: Re: Reading NSData from a file
- From: Mike Schrag <email@hidden>
- Date: Tue, 3 Apr 2007 00:56:26 -0400
What I'm trying to do here is to read back in the results of
having run convert on an uploaded image file and making a
thumbnail from it. The files are being written only for the
convenience of convert, so if I could get out of writing them that
would be all the better.
What are you using to convert it? AWT is not too bad for a Java
solution.
If by "not too bad" you mean "100x slower than native code" ... It
all depends on your needs:
* Slow, Easy, Pure Java, Cross Platform = JAI / Java2D (JAI is not
hardware accelerated on OS X)
* Faster, Pretty Annoying, Native, Mostly Cross Platform (portable c)
= System call to ImageMagick
* Faster, Way Annoying, Native, Mostly Cross Platform (portable c) =
JNI ImageMagick (this has huge memory pitfalls, don't do it)
* Really Fast, Easy, OS X Only = System call to 'sips'
* Super Fast, More Annoying, OS X Only = JNI CoreImage/ImageIO
(Brendan posted his version of this on wocode)
When I say 100x slower, I actually mean that. CoreImage and ImageIO
are AMAZINGLY fast at this. If you're going to be doing a lot of
these, you want that. If you're just doing one here and there, it
doesn't much matter. Calling sips commandline is pretty painless and
it's using the same API's, though you obviously take the hit of
setting up a process. If you're batching you could probably batch up
a set of conversions and execute them in one system call.
We use the JNI CoreImage route and Brendan's public code is pretty
similar to what we do.
Note that if you go the route of JAI/Java2D, make sure to set -
Djava.awt.headless=true or run your app as root, or your WO app will
crash as soon as it tries to load an AWT class.
I suppose SWT is an option here as well, though I've never tried to
use the image stuff in a non-client app, so I don't know what odd
crashy pitfalls await. I believe SWT image loading and scaling is
hardware accelerated on OS X.
ms
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