htmtxhi.cpp

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/*****************************************************************************\
  htmtxhi.cpp : Implimentation for Multilevel (HiFipe) dither matrix

  Copyright (c) 1994 - 2001, Hewlett-Packard Co.
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  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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\*****************************************************************************/

//===========================================================================
//
//  Filename     :  HTMTXHI.CPP
//
//  Module       :  Interlaken
//
//  Description  :  Multilevel(HiFipe) dither matrix based halftoning
//
//============================================================================

//=============================================================================
//  Header file dependencies
//=============================================================================

/*
#ifndef INCLUDED_HPENVTYP
#include "HPEnvTyp.h"
#endif
#ifndef INCLUDED_HTINTF
#include "HTIntf.h"
#endif
#ifndef INCLUDED_HTWORLD
#include "HTWorld.h"
#endif
#ifndef INCLUDED_HPASSERT
#include "HPAssert.h"
#endif
#ifndef INCLUDED_HTMATRIX
#include "htmatrix.h"
#endif
*/

#include "header.h"
#include "halftoner.h"

APDK_BEGIN_NAMESPACE

#define Dither4LevelHiFipe(matrix,bitMask)\
{\
    tone = (*inputPtr++ );\
    fedResPtr = fedResTbl + (tone << 2);\
    level = *fedResPtr++;\
    if (*(fedResPtr) >= (HPByte)matrix )\
    {\
            level++;\
    }\
        switch (level)\
        {\
            case 0:\
                break;\
            case 1:\
                rasterByte1 |= bitMask;\
                break;\
            case 2:\
                rasterByte2 |= bitMask;\
                break;\
            case 3:\
                rasterByte2 |= bitMask; rasterByte1 |= bitMask;\
                break;\
            case 4:\
                rasterByte3 |= bitMask;\
                break;\
            case 5:\
                rasterByte3 |= bitMask; rasterByte1 |= bitMask;\
                break;\
            case 6:\
                rasterByte3 |= bitMask; rasterByte2 |= bitMask;\
                break;\
            case 7:\
                rasterByte3 |= bitMask; rasterByte2 |= bitMask; rasterByte1 |= bitMask;\
                break;\
        }\
}

// Each dither matrix has a header of five bytes
//    1st byte    (Size (in bytes) of row in the matrix) - 1
//    2nd byte    Size (in bytes) of row in the matrix
//    3rd byte    Black offset
//    4th byte    Cyan offset
//    5th byte    Magenta offset
//
//    With matrix actually starting on the 6th Byte.
//
//    Black, cyan, and magenta are all offset into different
//    locations in the dither matrix.  (Yellow uses the same offsets as
//    magenta)
//

// Ditherparms should be set up as Fed with the following additions
// ditherParms->fSqueezeOffset = first dirty pixel, if white has been skipped at the beginning of the row
// ditherParmsPtr->fMatrixRowSize = Byte 2 of the Header
// ditherParmsPtr->fDitherCellOffset = Black, Cyan, or Magenta Offset respectively

//    To select the right row of the matrix for each color
//
//    ditherParms->fMatrixV1 = ((matrixStart + rasterIndex + DitherCellOffset) % (MatrixRowSize)) * (MatrixRowSize)

DRIVER_ERROR Halftoner::HTMATRIXHI_KCMY   (THTDitherParmsPtr ditherParmsPtr,
                           HPUInt16          count)
{
#if HPUNUSEDVAR
#pragma unused(envP1)
#endif

    THTDitherParmsPtr       ditherParms = ditherParmsPtr+count;
    HPByte                  tone;
    HPUInt8                 rasterByte1,rasterByte2, rasterByte3;
    HPUInt8                 level;
    HPInt16                 pixelCount;

    HPUInt16                numLoop = ditherParms->fNumPix;
    HPBytePtr               inputPtr = ditherParms->fInput;
    HPBytePtr               outputPtr1, outputPtr2, outputPtr3;

    HPBytePtr               fedResTbl = (HPBytePtr)ditherParms->fFEDResPtr;
    HPBytePtr               fedResPtr;

    HPBytePtr       matrixV    = ditherParms->fMatrixV1;
    HPBytePtr       matrixH;
    HPUInt16        index;
    HPUInt16        matrixRowSize = ditherParms->fMatrixRowSize;

    rasterByte1 = 0;
    rasterByte2 = 0;
    rasterByte3 = 0;

    outputPtr1 = ditherParms->fOutput1;
    outputPtr2 = ditherParms->fOutput2;
    outputPtr3 = ditherParms->fOutput3;

    if (!ditherParms->fSymmetricFlag)
        return SYSTEM_ERROR;    // matrixHI_KCMY asymetric not supported

    index = (ditherParms->fDitherCellOffset + ditherParms->fSqueezeOffset) % (matrixRowSize);
    matrixH = matrixV + index;

    for (pixelCount = numLoop + 8; (pixelCount -= 8) > 0; )
    {
        // if we've reached end of matrix we need to reset
        // our row pointer to the start of the row
        if ( index == matrixRowSize )
        {
            matrixH = matrixV;
            index = 0;
        }

        Dither4LevelHiFipe(*matrixH,0x80);
        matrixH++;
        Dither4LevelHiFipe(*matrixH,0x40);
        matrixH++;
        Dither4LevelHiFipe(*matrixH,0x20);
        matrixH++;
        Dither4LevelHiFipe(*matrixH,0x10);
        matrixH++;
        Dither4LevelHiFipe(*matrixH,0x08);
        matrixH++;
        Dither4LevelHiFipe(*matrixH,0x04);
        matrixH++;
        Dither4LevelHiFipe(*matrixH,0x02);
        matrixH++;
        Dither4LevelHiFipe(*matrixH,0x01);
        matrixH++;

        *outputPtr1++ |= rasterByte1;
        if (outputPtr2)
            *outputPtr2++ |= rasterByte2;
        rasterByte1 = 0;
        rasterByte2 = 0;

        index += 8;
    }
    return NO_ERROR;
}

unsigned char BayerMatrix[] =
{
    0x07,   0x08,   0x00,   0x00,   0x00,
    0x2,    0x82,   0x22,   0xa2,   0xa,    0x8a,   0x2a,   0xaa,
    0xc2,   0x42,   0xe2,   0x62,   0xca,   0x4a,   0xea,   0x6a,
    0x32,   0xb2,   0x12,   0x92,   0x3a,   0xba,   0x1a,   0x9a,
    0xf2,   0x72,   0xd2,   0x52,   0xfa,   0x7a,   0xda,   0x5a,
    0xe,    0x8e,   0x2e,   0xae,   0x6,    0x86,   0x26,   0xa6,
    0xce,   0x4e,   0xee,   0x6e,   0xc6,   0x46,   0xe6,   0x66,
    0x3e,   0xbe,   0x1e,   0x9e,   0x36,   0xb6,   0x16,   0x96,
    0xfe,   0x7e,   0xde,   0x5e,   0xf6,   0x76,   0xd6,   0x56,
};

APDK_END_NAMESPACE