TIL/TIL_Histogram.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Mark Alexander
 *      Side Effects Software Inc
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        TIL_Histogram.h (Tile Image Library, C++)
 *
 * COMMENTS:
 *      
 */
#ifndef TIL_HISTOGRAM_H
#define TIL_HISTOGRAM_H

#include "TIL_API.h"
#include <UT/UT_String.h>
#include <UT/UT_Vector2.h>
#include "TIL_Defines.h"

class TIL_Raster;

class TIL_API TIL_Histogram
{
public:
    
                         TIL_Histogram();
    virtual             ~TIL_Histogram();

    // setup.
    void                 setRaster(const TIL_Raster *generate_from,
                                   int comp = -1);
    void                 setMaxBuckets(int max);

    void                 generate(TIL_HistogramType type,
                                  bool usehue = true,
                                  bool primary = true,
                                  bool uvmode = false,
                                  float uvpos = 0.0f);

    // query the generated histogram.
    int                  isHistogram() const;
    int                  isGraph() const;

    const char          *getName() const { return myGraphName; }
    void                 getXAxis(UT_String &label, int &limited_range,
                                  float &start, float &end,
                                  int &floatval, int &usesbwpoints,
                                  int &usehue) const;
    void                 getYAxis(UT_String &label, int &limited_range,
                                  float &start, float &end,
                                  int &floatval, int &usesbwpoints,
                                  int &usehue) const;

    void                 getBWPoints(float &black, float &white) const;
    
    unsigned int         getHistogramSize(bool rebinned = true) const;
    const unsigned int  *getHistogram(bool rebinned = true) const;
    float                getCutoffPoint() const;

    bool                 getUVPos(float &pos, int &dir) const;
    
    void                 getGraphDimensions(int &width, int &height) const;
    const TIL_Raster    *getGraph() const;
    unsigned int         getGraphCount(int x, int y) const;

    // if hue is undefined, it will be set to -1 (normally it is [0, 360) ). 
    static void          RGBtoHSV(float r, float g, float b,
                                  float &h, float &s, float &v);
    static void          HSVtoRGB(float h, float s, float v,
                                  float &r, float &g, float &b);

    void                 rebin(const float histwidth);
    void                 getRangeForBar(int bar, float& start, float& end);
    
private:
    void                reset();
    void                scanRange(float &min, float &max);
    void                scanHistogram(float &min, float &max);
    static void         scanHistogram(  unsigned int const* histogram, int num_buckets,
                                        float &start, float &end, float& cutoff_point
                                      );

    // both these methods return a map from size to max buckets if the size
    // is too big. Otherwise (the size is less than the max) returns null.
    // You must delete [] this map! myHistogram or myGraph will point the
    // alloc'd mem. size = -1 allocs the max amount of mem for the hist/graph.
    unsigned int        *allocHistogram(int size = -1);
    unsigned int        *allocGraph(int width, int depth = -1);

    void                convertGraphToRaster(int use_huex, int use_huey,
                                             int cindex);
    
    void                generateRawHist();
    void                generateHSVHist(int which);

    void                generateRaw(int uv, bool uvmode, float uvpos);
    void                generateHSV(int which, int uv,
                                    bool uvmode, float uvpos);
    void                generateHueGraph(int which);
    
private:
    const TIL_Raster *  myRaster;
    int                 myComponent;
    int                 myGraphType;

    TIL_HistogramType    myType;
    const char          *myGraphName;
    const char          *myXLabel;
    const char          *myYLabel;
    float               myXStart, myXEnd;
    float               myYStart, myYEnd;
    int                 myXFloat, myYFloat;
    int                 myXHue, myYHue;
    int                 myXLimited, myYLimited;
    int                 myWhitePointAxis;
    bool                myUVMode;
    float               myUVPos;

    // for histograms.
    int                 myMaxBuckets;
    int                 myNumBuckets;
    unsigned int       *myHistogram;
    float               myCutoffPoint;

    // for dynamic rebinning of histograms
    unsigned int*       myRebinnedHistogram;
    unsigned int*       myBinRangeTable;
    int                 myAllocatedBins;
    int                 myNumBins;
    float               myRebinnedCutoffPoint;
    bool                myHasRebinnedHistogram;

    // for graphs.
    unsigned int        myGraphWidth;
    unsigned int        myGraphHeight;
    unsigned char       *myGraph;
    TIL_Raster          *myDisplayGraph;
};

#endif

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