/*

        File: HistogramOperationPlugIn.h

    Abstract: HistogramOperationPlugin, Histogram and HistogramImageProvider classes.

     Version: 1.0

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*/

#import <Quartz/Quartz.h>

#import <Accelerate/Accelerate.h>

/* Set this to 1 to use a custom <QCPlugInOutputImageProvider> class instead of the convenience method -outputImageProviderFromBufferWithPixelFormat */

#define __USE_PROVIDER__ 1

#if __USE_PROVIDER__

@class Histogram;

#endif

@interface HistogramOperationPlugIn : QCPlugIn

{

#if __USE_PROVIDER__

    Histogram*                      _cachedHistogram;

#endif

}

/* Declare a property input port of type "Image" and with the key "inputSourceImage" */

@property(assign) id<QCPlugInInputImageSource> inputSourceImage;

/* Declare a property input port of type "Image" and with the key "inputHistogramImage" */

@property(assign) id<QCPlugInInputImageSource> inputHistogramImage;

/* Declare a property output port of type "Image" and with the key "outputResultImage" */

@property(assign) id<QCPlugInOutputImageProvider> outputResultImage;

@end

#if __USE_PROVIDER__

/* This internal class computes lazily an RGBA histogram from an image */

@interface Histogram : NSObject

{

    id<QCPlugInInputImageSource>    _image;

    CGColorSpaceRef                 _colorSpace;

    vImagePixelCount                _histogramA[256];

    vImagePixelCount                _histogramR[256];

    vImagePixelCount                _histogramG[256];

    vImagePixelCount                _histogramB[256];

}

- (id) initWithImageSource:(id<QCPlugInInputImageSource>)image colorSpace:(CGColorSpaceRef)colorSpace;

- (BOOL) getRGBAHistograms:(vImagePixelCount**)histograms;

@end

/* This internal class represents the images this plug-in produces */

@interface HistogramImageProvider : NSObject <QCPlugInOutputImageProvider>

{

    id<QCPlugInInputImageSource>    _image;

    Histogram*                      _histogram;

}

- (id) initWithImageSource:(id<QCPlugInInputImageSource>)image histogram:(Histogram*)histogram;

@end

#endif