filterhpa.h

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/*****************************************************************************\
  filterhpa.h : Interface for the TErnieFilter class

  Copyright (c) 1996 - 2001, Hewlett-Packard Co.
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  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
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\*****************************************************************************/


#ifndef APDK_FILTERHPA_H
#define APDK_FILTERHPA_H

#if defined(APDK_DJ9xxVIP) && defined(APDK_VIP_COLORFILTERING)

APDK_BEGIN_NAMESPACE

/*  flags that track the block formations use bits which are specified in the
    following enumeration. The first number is the horizontal block size. The
    second number is the vertical block size. Then north (upper) or south (lower)
    and west (left) or east (right) are specified when appropriate. Finally if a
    location sequence number is needed then it is listed.
*/

enum eBlockType
{
    eDone   = 0x0,
    e11n    = 0x00000001,
    e11s    = 0x00000002,
    e12     = 0x00000004,
    e14n    = 0x00000008,
    e14s    = 0x00000010,
    e21nw   = 0x00000020,
    e21ne   = 0x00000040,
    e21sw   = 0x00000080,
    e21se   = 0x00000100,
    e22w    = 0x00000200,
    e22e    = 0x00000400,
    e24nw   = 0x00000800,
    e24ne   = 0x00001000,
    e24sw   = 0x00002000,
    e24se   = 0x00004000,
    e41ni   = 0x00008000,
    e41n    = 0x00010000,
    e41si   = 0x00020000,
    e41s    = 0x00040000,
    e42i    = 0x00080000,
    e42     = 0x00100000,
    e44ni   = 0x00200000,
    e44n    = 0x00400000,
    e44si   = 0x00800000,
    e44s    = 0x01000000,
    e84ni   = 0x02000000,
    e84n    = 0x04000000,
    e84si   = 0x08000000,
    e84s    = 0x10000000,

    eNorths = e11n | e21nw | e21ne | e41ni | e41n,
    eSouths = e11s | e21sw | e21se | e41si | e41s,
    eTheRest = ~(eNorths|eSouths),

    eTopLeftOfBlocks = e12 | e14n | e21nw | e21sw | e22w | e24nw | e41ni | e41si | e42i | e44ni | e84ni
};

#define isOdd(x) (x & 0x01)
#define isWhite(x) (((x) & kWhite) == kWhite)

#define kMemWritesOptimize  0   // disables mem write optimizations.

//#ifndef kGatherStats
//#error "must define kGatherStats. Try including platform.h"
//#endif

#if kGatherStats == 1

// Used now to track blocks being formed. These enums are only used in gathering
// statistics for the developer to look at later. These are not critical to the actual
// functioning of the algorithms.

enum StatisticBlocks
{
    es11n   = 0,
    es11s,
    es12,
    es14n,
    es14s,
    es21nw,
    es21ne,
    es21sw,
    es21se,
    es22w,
    es22e,
    es24nw,
    es24ne,
    es24sw,
    es24se,
    es41ni,
    es41n,
    es41si,
    es41s,
    es42i,
    es42,
    es44ni,
    es44n,
    es44si,
    es44s,
    es84ni,
    es84n,
    es84si,
    es84s,

    esDoneStat,
    esWhiteFound,

    eLastAveragingFlagPosition
};

#endif

enum pixelTypes
{
    eBGRPixelData = 0
};

class TErnieFilter : public Processor
{
public:
    TErnieFilter(int rowWidthInPixels, pixelTypes pixelType, unsigned int maxErrorForTwoPixels, int bytesPerPixel = 3);
    virtual ~TErnieFilter();

    void submitRowToFilter(unsigned char *rowPtr);
    void writeBufferedRows();

     // Processor interface  /////////////////////////////////////
    BOOL Process(RASTERDATA* InputRaster=NULL);
    void Flush();
    unsigned int GetOutputWidth(COLORTYPE  rastercolor);
    unsigned int GetInputWidth();
    BYTE* NextOutputRaster(COLORTYPE  rastercolor);
    /////////////////////////////////////////////////////////////

private:
    uint32_t	        *fRowBuf[4];
    unsigned char       *fRowPtr[4];
	BYTE                *fBlackRowPtr[4];
	unsigned int        BlackRasterSize[4];
    unsigned char       *fCompressionOutBuf;
    unsigned int        *fPixelFilteredFlags[2];

    int                 fNumberOfBufferedRows;
    int                 fPixelOffset[8];
    int                 fPixelOffsetIndex;
    int                 fRowWidthInPixels;
    int                 fRowWidthInBytes;
    int                 fInternalBufferPixelSize;
    int                 fOriginalPixelSize;
    unsigned int        fMaxErrorForTwoPixels;

	int                 RowIndex;

    void Filter1RawRow(unsigned char *currPtr, int rowWidthInPixels, unsigned int *flagsPtr);
    void Filter2RawRows(unsigned char *currPtr, unsigned char *upPtr, int rowWidthInPixels, unsigned int *flagsPtr);
    void Filter2PairsOfFilteredRows(unsigned char *row1Ptr, unsigned char *row2Ptr, unsigned char *row3Ptr, unsigned char *row4Ptr);
    void Filter3FilteredRows(unsigned char *row1Ptr, unsigned char *row2Ptr, unsigned char *row3Ptr);
    inline unsigned int DeltaE(int dr0, int dr1, int dg0, int dg1, int db0, int db1);
    inline bool NewDeltaE(int dr0, int dr1, int dg0, int dg1, int db0, int db1, int tolerance);
    inline unsigned int GradDeltaE(int dr, int dg, int db);

#if kMemWritesOptimize == 1
    void WriteBlockPixels();
#endif

    enum
    {
        eBufferedPixelWidthInBytes = 4
    };
}; //TErnieFilter

APDK_END_NAMESPACE

#endif //APDK_DJ9xxVIP && APDK_VIP_COLORFILTERING
#endif //APDK_FILTERHPA_H