Is there a way to access the virtual data port for Mode, on
CIMixOver within the QC application?
First things first, this is a private CoreImage Filter, so it's
unrelated to QC (qc just creates a CI* patch for every CI Filter it
finds, private or not). Because it's private, there's no
documentation for it, and you shouldn't depend on it, blah blah blah.
However, creating the filter allows for some interrogation. Using the
following objc code:
CIFilter *cimixover = [CIFilter filterWithName:@"CIMixOver"];
NSLog(@"mixover: %@", cimixover);
NSLog(@"attr: %@", [cimixover attributes]);
NSLog(@"input: %@", [cimixover inputKeys]);
Produces the following output:
2010-01-14 09:33:48.185 ci[20991:10b] mixover: {CIMixOver {
inputBackgroundImage = <null>;
inputFilteredImage = <null>;
inputImage = <null>;
inputMode = <null>;
}}
2010-01-14 09:33:48.192 ci[20991:10b] attr: {
CIAttributeDescription = CIMixOver;
CIAttributeFilterCategories = (
CICategoryCompositeOperation,
CICategoryVideo,
CICategoryStillImage,
CICategoryInterlaced,
CICategoryNonSquarePixels,
CICategoryBuiltIn,
CICategoryApplePrivate
);
CIAttributeFilterDisplayName = CIMixOver;
CIAttributeFilterName = CIMixOver;
CIAttributeReferenceDocumentation = http://developer.apple.com/cgi-bin/apple_ref.cgi?apple_ref=//apple_ref/doc/filter/ci/CIMixOver
;
inputBackgroundImage = {
CIAttributeClass = CIImage;
CIAttributeDescription = "The image to use as a background
image.";
CIAttributeDisplayName = "Background Image";
CIUIParameterSet = CIUISetBasic;
};
inputFilteredImage = {
CIAttributeClass = CIImage;
CIAttributeDisplayName = FilteredImage;
CIUIParameterSet = CIUISetBasic;
};
inputImage = {
CIAttributeClass = CIImage;
CIAttributeDescription = "The image to use as an input image.
For filters that also use a background image, this is the foreground
image.";
CIAttributeDisplayName = Image;
CIUIParameterSet = CIUISetBasic;
};
inputMode = {
CIAttributeClass = NSString;
CIAttributeDefault = over;
CIAttributeDisplayName = Mode;
CIUIParameterSet = CIUISetBasic;
so inputMode looks like it's expecting a string (with @"over" being
the default?). I'm not sure what other strings are allowed, and why
QC doesn't just make it a string port (perhaps because strings aren't
normally a part of CoreImage filters?), but at least you know a bit
more now. ;)
The CIAttributeReferenceDocumentation URL is bogus -- it's the CI
filter reference, but QCMixOver isn't included on that page.
--
[ christopher wright ]
[email protected]
http://kineme.net/
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