you will most likely need to use an NSBitmapImageRep or a
CVPixelbuffer to provide raw pixel values, and then output an image
provider using your QCContexts incredibly long:
- (id) outputImageProviderFromBufferWithPixelFormat:(NSString*)format
pixelsWide:(NSUInteger)width pixelsHigh:(NSUInteger)height baseAddress:
(const void*)baseAddress bytesPerRow:(NSUInteger)rowBytes
releaseCallback:(QCPlugInBufferReleaseCallback)callback releaseContext:
(void*)context colorSpace:(CGColorSpaceRef)colorSpace shouldColorMatch:
(BOOL)colorMatch
method.
The release context is not a GL context or anything, just a void * you
can pass in to your release function to point it at whatever you want
to make your life easier.
Here is working code from a CVPixelBuffer to an output port, where
aBuffer is just an unsigned char* buffer. Im pretty sure you can do
that same with NSBitmapImageRep
CVReturn error = CVPixelBufferCreateWithBytes(NULL, width, height,
k32ARGBPixelFormat, aBuffer, rowBytes, NULL, NULL, NULL,
&cvImageBuffer);
if(CVPixelBufferLockBaseAddress(cvImageBuffer,0) ==
kCVReturnSuccess)
{
provider = [context
outputImageProviderFromBufferWithPixelFormat:QCPlugInPixelFormatARGB8
pixelsWide:width pixelsHigh:height
baseAddress:CVPixelBufferGetBaseAddress(cvImageBuffer)
bytesPerRow:CVPixelBufferGetBytesPerRow(cvImageBuffer)
releaseCallback:_BufferReleaseCallback releaseContext:NULL
colorSpace:CGColorSpaceCreateWithName(kCGColorSpaceGenericRGBLinear)
shouldColorMatch:YES];
CVPixelBufferUnlockBaseAddress(cvImageBuffer,0);
}
Hope this helps!
On Jul 5, 2009, at 12:08 PM, Adrian Lo wrote:
Dear all,
I'm having some trouble trying to proceed with this custom patch
that I've got. The patch basically accepts some numeric input
parameters which determines what data to grab from a URL, and
renders the results into an image to be send out via the output port
of the patch.
I've got the image generated nicely as a NSImage, and I'm not stuck
on how to send the NSImage to the output port. Would really
appreciate some pointers on this, as I'm not even sure if I should
be using NSImage for such operations or not.
thanks in advance,
Adrian
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