halftoner.cpp

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/*****************************************************************************\
  halftoner.cpp : Implimentation for the Halftoner class

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  All rights reserved.

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//===========================================================================
//
//  Filename     :  halftoner.cpp
//
//  Module       :  Open Source Imaging
//
//  Description  :  This file contains the constructor and destructor for
//                  the Halftoner class, which performs color-matching and
//                  halftoning.
//
// Detailed Description:
//
// The only member functions needed are Process(inputRaster)
// and Restart (used to skip white space and for new page).
//
// Configurability required in Slimhost driver is reflected in the
// parameters to the constructor:
// 1. SystemServices encapsulates memory management for platform-independence
// 2. PrintMode contains info on resolution and other properties
// 3. iInputWidth tells how many pixels input per plane
// 4. iNumRows is 1 except for mixed-resolution cases
// 5. HiResFactor is for boosting base resolution, e.g. 2 if 600 dpi grid
//      (base res assumed to be 300)
//
// These structures, together with the variable StartPlane (designating
// K or C in the fixed ordering KCMY), are accessed by the Translator
// component of the driver, in order to properly package the data in
// the printer command language.
//============================================================================

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

APDK_BEGIN_NAMESPACE

Halftoner::Halftoner
(
    SystemServices* pSys,
    PrintMode* pPM,
    unsigned int iInputWidth,
    unsigned int iNumRows[],
    unsigned int HiResFactor,
    BOOL matrixbased
) : ColorPlaneCount(pPM->dyeCount),
    InputWidth(iInputWidth),
    ResBoost(HiResFactor),
    pSS(pSys),
    nNextRaster(0),
    fBlackFEDResPtr(pPM->BlackFEDTable),
    fColorFEDResPtr(pPM->ColorFEDTable),
    iColor(0),
    iRow(0),
    iPlane(0),
    tempBuffer(NULL),
    tempBuffer2(NULL),
    hold_random(0),
    usematrix(matrixbased)
{
    unsigned int i;
    int j,k,PlaneSize;
    constructor_error = NO_ERROR;

    StartPlane = K;       // most common case

    if (ColorPlaneCount == 3)     // CMY pen
      {
        StartPlane=C;
        NumRows[K] = ColorDepth[K] = OutputWidth[K] = 0;
      }

    EndPlane=Y;         // most common case
    if (ColorPlaneCount == 6)
    {
        EndPlane = Mlight;
    }
    if (ColorPlaneCount == 1)
    {
        EndPlane = K;
    }

    AdjustedInputWidth = InputWidth;
    if (AdjustedInputWidth % 8)
    {
        AdjustedInputWidth += 8 - (AdjustedInputWidth % 8);
    }

    // init arrays
    for (i = StartPlane; i < (ColorPlaneCount + StartPlane); i++)
    {
        ColorDepth[i]= pPM->ColorDepth[i];
        NumRows[i]=iNumRows[i];

        OutputWidth[i] = AdjustedInputWidth * NumRows[i] * ResBoost;

    }
    for (;i < (unsigned)MAXCOLORPLANES; i++)
    {
        NumRows[i] = ColorDepth[i] = OutputWidth[i] = 0;
    }

    oddbits = AdjustedInputWidth - InputWidth;
    ///////////////////////////////////////////////////////////////////////////
    for (i=0; i <= Mlight; i++)
    {
        ErrBuff[i]=NULL;
    }

    for (i=StartPlane; i <= EndPlane; i++)
    {
        ErrBuff[i] = (short*)pSS->AllocMem((OutputWidth[i] + 2) * sizeof(short));
        if (ErrBuff[i] == NULL)
        {
            goto MemoryError;
        }
    }

    if (OutputWidth[K] > AdjustedInputWidth)
    // need to expand input data (easier than expanding bit-pixels after) on K row
    {
        tempBuffer = (BYTE*) pSS->AllocMem(OutputWidth[K]);
        if (tempBuffer == NULL)
        {
            goto MemoryError;
        }
        if (EndPlane > Y)
        {
            tempBuffer2 = (BYTE*) pSS->AllocMem(OutputWidth[K]);
            if (tempBuffer2 == NULL)
            {
                goto MemoryError;
            }
        }

    }


    Restart();  // this zeroes buffers and sets nextraster counter

    // allocate output buffers
    for (i = 0; i < (unsigned)MAXCOLORPLANES; i++)
    {
        for (j = 0; j < MAXCOLORROWS; j++)
        {
            for (k = 0; k < MAXCOLORDEPTH; k++)
            {
                ColorPlane[i][j][k] = NULL;
            }
        }
    }

    for (i=StartPlane; i < (ColorPlaneCount+StartPlane); i++)
    {
        for (j=0; j < NumRows[i]; j++)
        {
            for (k=0; k < ColorDepth[i]; k++)
            {
                PlaneSize= OutputWidth[i]/8 + // doublecheck ... should already be divisble by 8
                            ((OutputWidth[i] % 8)!=0);
                ColorPlane[i][j][k] = (BYTE*) pSS->AllocMem(PlaneSize);
                if (ColorPlane[i][j] == NULL)
                {
                    goto MemoryError;
                }
                memset(ColorPlane[i][j][k], 0, PlaneSize);
            }
        }
    }

    PlaneSize= (OutputWidth[0] + 7) / 8;
    originalKData = (BYTE*) pSS->AllocMem(PlaneSize);
    if (originalKData == NULL)
    {
        goto MemoryError;
    }
    memset(originalKData, 0, PlaneSize);
    return;

MemoryError:
    constructor_error=ALLOCMEM_ERROR;

    FreeBuffers();

    for (i=0; i < ColorPlaneCount; i++)
    {
        for (j=0; j < NumRows[i]; j++)
        {
            for (k=0; k < ColorDepth[i]; k++)
            {
                if (ColorPlane[i][j][k])
                {
                    pSS->FreeMemory(ColorPlane[i][j][k]);
                }
            }
        }
    }
	if (originalKData)
	{
		pSS->FreeMemory(originalKData);
	}

} //Halftoner


Halftoner::~Halftoner()
{
    DBG1("destroying Halftoner \n");

    FreeBuffers();

    for (int i=0; i < MAXCOLORPLANES; i++)
    {
        for (int j=0; j < NumRows[i]; j++)
        {
            for (int k=0; k < ColorDepth[i]; k++)
            {
                if (ColorPlane[i][j][k])
                {
                    pSS->FreeMemory(ColorPlane[i][j][k]);
                }
            }
        }
    }
	if (originalKData)
	{
		pSS->FreeMemory(originalKData);
	}
} //~Halftoner


void Halftoner::Restart()
{
    nNextRaster = 0;

    for (unsigned int i = StartPlane; i <= EndPlane; i++)
      {
        memset(ErrBuff[i], 0, (OutputWidth[i]+2) * sizeof(short));
      }

    started = FALSE;
} //Restart


void Halftoner::Flush()
{
    if (!started)
    {
        return;
    }
    Restart();
} //Flush


void Halftoner::FreeBuffers()
{
    for (unsigned int i = StartPlane; i <= EndPlane; i++)
      {
        pSS->FreeMemory(ErrBuff[i]);
      }
    if (tempBuffer)
    {
        pSS->FreeMemory(tempBuffer);
    }
    if (tempBuffer2)
    {
        pSS->FreeMemory(tempBuffer2);
    }
} //FreeBuffers


// dumb horizontal doubling (tripling, etc.) for resolution-boost prior to halftoning
void Halftoner::PixelMultiply(unsigned char* buffer, unsigned int width, unsigned int factor)
{
    if (factor == 1)
    {
        return;
    }

    for (int j = (int)(width-1); j >= 0; j--)
    {
        unsigned int iOffset = j * factor;
        for (unsigned int k = 0; k < factor; k++)
        {
            buffer[iOffset + k] = buffer[j];
        }
    }

} //PixelMultiply


BYTE* Halftoner::NextOutputRaster(COLORTYPE  rastercolor)
{
	if (rastercolor == COLORTYPE_COLOR)
	{
		if (iRastersReady == 0)
		{
			return NULL;
		}

		if (iColor == (ColorPlaneCount+StartPlane))
		{
			return NULL;
		}

		if (iPlane == ColorDepth[iColor])
		{
			iPlane = 0;
			iRow++;
			return NextOutputRaster(rastercolor);
		}

		if (iRow == NumRows[iColor])
		{
			iRow = 0;
			iColor++;
			return NextOutputRaster(rastercolor);
		}

		iRastersDelivered++;
		iRastersReady--;
		return ColorPlane[iColor][iRow][iPlane++];
	}
	else
	{
		return NULL;
	}
} //NextOutputRaster


BOOL Halftoner::LastPlane()
{
      return ((iColor == (ColorPlaneCount+StartPlane-1)) &&
              (iRow == (unsigned int)(NumRows[iColor] - 1)) &&
              (iPlane == ColorDepth[iColor])        // was pre-incremented
              );
} //LastPlane


BOOL Halftoner::FirstPlane()
{
      return ((iColor == StartPlane) &&
              (iRow == 0) &&
              (iPlane == 1)        // was pre-incremented
              );
} //FirstPlane


unsigned int Halftoner::GetOutputWidth(COLORTYPE  rastercolor)
// return size of data in the plane being delivered (depends on iRastersDelivered)
// (will be used in connection with compression seedrow)
{
	if (rastercolor == COLORTYPE_COLOR)
	{
		unsigned int colorplane, tmp;
		// figure out which colorplane we're on
		unsigned int rasterd = iRastersDelivered;
		// we come after increment of iRastersDelivered
		if (rasterd>0)
		{
			rasterd--;
		}

		tmp = (unsigned int)(NumRows[0]*ColorDepth[0]);
		if (rasterd < tmp)
		{
			colorplane = 0;
		}
		// have to count up to possible 6th plane;
		// but we'll save code by assuming sizes of C,M,Y (Cl,Ml) are all same
		else
		{
			colorplane = 1;
		}

		int temp = (OutputWidth[colorplane] + 7) / 8;
		return temp;
	}
	else
	{
		return 0;
	}
} //GetOutputWidth


unsigned int Halftoner::GetMaxOutputWidth(COLORTYPE  rastercolor)
// This is needed by Configure, since the output-width for Halftoner is variable
// depending on the colorplane
{
	if (rastercolor == COLORTYPE_COLOR)
	{
		unsigned int max=0;
		for (unsigned int i=StartPlane; i <= EndPlane; i++)
		{
			if (OutputWidth[i] > max)
			{
				max = OutputWidth[i];
			}
		}
		return (max / 8) + ((max % 8)!=0);
	}
	else
	{
		return 0;
	}
} //GetMaxOutputWidth


unsigned int Halftoner::PlaneCount()
{
 unsigned int count=0;

     for (int i = 0; i < MAXCOLORPLANES; i++)
     {
         count += NumRows[i] * ColorDepth[i];
     }

  return count;
} //PlaneCount


void Halftoner::CleanOddBits(unsigned int iColor, unsigned int iRow)
{
    int index = (OutputWidth[iColor]/8)-1;

    for (int i=0; i < ColorDepth[iColor]; i++)
    {
        BYTE lastbyte0 = ColorPlane[iColor][iRow][i][index];
        lastbyte0 = lastbyte0 >> oddbits;
        lastbyte0 = lastbyte0 << oddbits;
        ColorPlane[iColor][iRow][i][index] = lastbyte0;
    }
} //CleanOddBits

APDK_END_NAMESPACE