[Openmcl-devel] Advice needed: best way to fram a Lisp array into an ns-image

Ron Garret ron at awun.net
Sat Jan 19 01:15:50 UTC 2008


What is the easiest way to fram a Lisp array of numbers representing  
pixel data into an ns-image object?  The best I've been able to come  
up with is:

1.  Create the NSImage and initialize it with initWithSize

2.  Create an NSData object and stick the pixel data into it.

2.  Create an NSBitMapImageRep and initialize it with (deep breath)...
initWithBitmapDataPlanes:pixelsWide:pixelsHigh:bitsPerSample:samplesPerPixel:hasAlpha:isPlanar:colorSpaceName:bytesPerRow:bitsPerPixel

(Whew!)

3.  Add the NSBitMapImageRep to the NSImage using addRepresentation:

But that seems horribly clunky compared to how easy everything else  
having to do with images is turning out to be.  Is there a better way  
to do this?

(BTW, the only reason I really need to do this is that getPixel:atX:y:  
and setPixel:atX:y:: are gawdawful slow, like a thousand times slower  
than an aref.  If there's a fast way to access pixels directly from a  
NSBitMapImageRep then I can just use that.  But it seems like there's  
not.)

Thanks,
rg




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