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Re: NSImage initWithData: and jpegs

From: Adam Fedor
Subject: Re: NSImage initWithData: and jpegs
Date: Wed, 8 Oct 2003 09:52:43 -0600

On Wednesday, October 8, 2003, at 07:13 AM, Björn Giesler wrote:


another one... I haven't quite grokked the backend/frontend weaving of images, so maybe someone who knows better can tell me this: Why, if I have a jpeg file called "pic.jpg", does
        [[NSImage alloc] initWithContentsOfFile: @"pic.jpg"]
return a valid NSImage, but
[[NSImage alloc] initWithData: [NSData dataWithContentsOfFile: @"pic.jpg"]]
return nil? Is this some problem with JPEG magic numbers?

Image reading is really hacked together (I can say that because I did it :-) ), currently it uses functions from wrlib (WIndowMaker) to read jpg, pnm files, etc which only take filenames as input. Really NSBitmapImageRep should be re-written to use libjpg, etc directly to read images from anywhere.

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