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


NSBitmapImageRep is a subclass of NSImageRep, and so, it responds to - draw, -drawAtPoint: and -drawInRect:.

Maybe trying to directly draw the bitmap representation will avoid caching and other NSImage optimization issues.

[rayTracer.imageRep drawInrect:rect];


Le 31 mars 08 à 16:21, Eddie Hebert a écrit :
It appears to be properly storing the values, through inspection from NSLog and colorAt.
The next step is drawing, I am trying to show incremental updates of the progress of the render engine,
within the drawRect method of an NSImageView I am calling (at an interval based on NSTimer)

[[self image] drawRepresentation:rayTracer.imageRep inRect:rect];

I have set up the image by using

[self setImage:[[NSImage alloc] initWithSize:rect.size]];
[[self image] setCacheMode:NSImageCacheNever];

Is this an issue now of not using [NSGraphicsContext saveState], etc.?

merci beaucop

On Mar 31, 2008, at 10:02 AM, Jean-Daniel Dupas wrote:

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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References: 


 >Writing x, y to NSBitmapImageRep (From: Eddie Hebert <email@hidden>)


 >Re: Writing x, y to NSBitmapImageRep (From: Jean-Daniel Dupas <email@hidden>)























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