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Re: help with NSImage
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Re: help with NSImage

  • Subject: Re: help with NSImage
  • From: "M. Uli Kusterer" <email@hidden>
  • Date: Sat, 12 Feb 2005 14:14:30 +0100
At 12:11 Uhr +0000 12.02.2005, Daniel O'Sullivan wrote:
I'm a new to cocoa so this will probably sound rather basic, but i'm looking to display .ppm images using NSImage. Do i use NSQuickDrawView? if anyone could help me, it would be really appreciated especailly if theres any example code out there that i could view.

I don't think Cocoa or QuickTime support loading pbm and ppm images yet. IIRC, PPM is this text-based file format that uses numeric strings to encode each pixel, right? <http://netpbm.sourceforge.net/doc/ppm.html>

In that case, your best bet is to use NSString -stringWithContentsOfFile: to load the PPM, and then to parse that string for the actual image data using NSScanner. Create an NSImage once you know the proper size and draw the colored pixels into that.

If you're a seasoned C programmer, you might just want to create a memory buffer using malloc() and hand that to an NSBitmapImageRep created via -initWithBitmapDataPlanes:, after writing the image data directly to that buffer.

If you're new to programming in general, just do a lockFocus on the image and use NSBezierPath to draw a one-pixel "line" for each pixel, using NSColor to set the desired colors. That will be slower, but should be easier to work out than the pointer arithmetics you'd otherwise need.

If you have some portable C source code that parses PPMs and generates, say, an RGBA buffer from that, you can also just use that code and pass the buffer to -initWithBitmapDataPlanes: above.
--
Cheers,
M. Uli Kusterer
------------------------------------------------------------
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
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References: 
 >help with NSImage (From: "Daniel O'Sullivan" <email@hidden>)

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