Apple

Look into the epeg library or the EpegWrapper framework by Marc Liyanage for cocoa. I should probably email Marc to let him know, but the wrapper framework actually contains a bug in that the returned image is not autoreleased. Not a big deal as long as you're aware of it.

On May 18, 2005, at 11:05 AM, Michael Becker wrote:

Message: 3
Date: Wed, 18 May 2005 17:16:08 +0200
From: Michael Becker <email@hidden>
Subject: Loading already scaled JPEGs
To: Cocoa Dev Dev <email@hidden>
Message-ID: <email@hidden">email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Hello!

Recently, a friend told me, that in certain libraries available to
Delphi, there are functions to load JPEGs in an already scaled
version. That means, I have a 1024 x 768 pixel JPEG on disk and can
load it at, say, scale factor 0.5, resulting in a 512 x 384 pixel
image. The idea here is to circumvent the procedure of loading the
full-sized JPEG and then resizing it.

Is there any such thing in Cocoa? Or anything similar?

My problem is that right now I am loading lots of images, and if some
of those are really big, it noticeably slows down my application's
response time. The images will be displayed at about 400 x 400 pixels
max. anyways, so loading them in an already scaled version would help
me.

Any suggestions / hints?

Regards,
Michael