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Re: Writing x, y to NSBitmapImageRep
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Re: Writing x, y to NSBitmapImageRep


  • Subject: Re: Writing x, y to NSBitmapImageRep
  • From: Jean-Daniel Dupas <email@hidden>
  • Date: Mon, 31 Mar 2008 16:02:31 +0200

You should use
-[NSBitmapImageRep initWithBitmapDataPlanes:pixelsWide:pixelsHigh:bitsPerSample:samplesPerPixel:hasAlpha:isPlanar:colorSpaceName:bitmapFormat:bytesPerRow:bitsPerPixel :]
to initialize your bitmap.


A bitmap representation initialized using -initForIncrementalLoad expects that you call -incrementalLoadFromData:complete:



Le 31 mars 08 à 15:54, Eddie Hebert a écrit :
I have a need to store and draw an image that I create iteratively over each pixel.
I am trying to use NSBitmapImageRep with setColor: x: y:, to do so.


Within the constructor of my "rendering engine" class, I instantiate a NSBitmapImageRep, thusly:

_imageRep = [[NSBitmapImageRep alloc] initForIncrementalLoad];
[_imageRep setSize:NSMakeSize(aWidth, aHeight)];
[_imageRep setPixelsWide:aWidth];
[_imageRep setPixelsHigh:aHeight];
[_imageRep setColorSpaceName:@"NSDeviceRGBColorSpace"];
[_imageRep setAlpha:NO];

Then in the main loop of my engine I call, [_imageRep setColor:color atX:col y:row]

When I do so I get the error:

Mon Mar 31 09:41:41 ***.local Ray Tracer[15727] <Error>: CGImageSourceCopyPropertiesAtIndex image source parameter is nil\n
Mon Mar 31 09:41:41 ***.local Ray Tracer[15727] <Error>: CGImageSourceCreateImageAtIndex image source parameter is nil\n
Mon Mar 31 09:41:41 ***.local Ray Tracer[15727] <Error>: CGImageSourceCopyPropertiesAtIndex image source parameter is nil\n
Mon Mar 31 09:41:41 ***.local Ray Tracer[15727] <Error>: CGImageSourceCreateImageAtIndex image source parameter is nil\n


And when I call [_imageRep colorAtX:col y:row], I get back NSDeviceRGBColorSpace 1 1 1 1, which is not the NSColor that I sent it.

Is there some parameter/property of NSBitmapImageRep that I am not setting that is causing these errors?
Or does this have something to do with not locking properly?


Thanks in advance,
Ed Hebert Jr.
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