compression.cpp

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/*****************************************************************************\
  compression.cpp : Implimentation for the Compressor class

  Copyright (c) 1996 - 2001, Hewlett-Packard Co.
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
  3. Neither the name of Hewlett-Packard nor the names of its
     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  TO, PATENT INFRINGEMENT; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\*****************************************************************************/


#include "header.h"

APDK_BEGIN_NAMESPACE

Compressor::Compressor(SystemServices* pSys, unsigned int RasterSize, BOOL useseed)
    : pSS(pSys), SeedRow(NULL), UseSeedRow(useseed), inputsize(RasterSize), seeded(FALSE)
{
    constructor_error=NO_ERROR;
    iRastersReady=0;

	originalKData=pSS->AllocMem(RasterSize);
	CNEWCHECK(originalKData);

    if (!UseSeedRow)
        return;

    SeedRow=pSS->AllocMem(RasterSize);
    CNEWCHECK(SeedRow);
}

Compressor::~Compressor()
{
	if (compressBuf) 
		pSS->FreeMem (compressBuf);
    if (SeedRow)
        pSS->FreeMem (SeedRow);
	if (originalKData)
		pSS->FreeMem (originalKData);
}

unsigned int Compressor::GetOutputWidth(COLORTYPE color)
// since we return 1-for-1, just return result first call
{
	if (myplane == color)
	{
		return compressedsize;
	}
	else
	{
		return raster.rastersize[color];
	}
}


BYTE* Compressor::NextOutputRaster(COLORTYPE color)
// since we return 1-for-1, just return result first call
{
    if (iRastersReady==0)
        return (BYTE*)NULL;
	if (color == COLORTYPE_COLOR)
	{
		iRastersReady=0;
	}
	if (myplane == color)
	{
		if (raster.rasterdata[color] == NULL)
			if (compressedsize != 0 && myplane == COLORTYPE_BLACK)
				return compressBuf;
			else
				return NULL;
		else
			return compressBuf;
	}
	else
	{
		return raster.rasterdata[color];
	}
}

Mode9::Mode9(SystemServices* pSys,unsigned int RasterSize)
    : Compressor(pSys,RasterSize, TRUE)
{
    if (constructor_error != NO_ERROR)  // if error in base constructor
        return;

	// In the worst case, compression expands data by 50%
	compressBuf = (BYTE*)pSS->AllocMem(RasterSize + RasterSize/2);
	if (compressBuf == NULL)
		constructor_error=ALLOCMEM_ERROR;

	memset(compressBuf, 0, RasterSize + RasterSize/2);
    memset(SeedRow,0,RasterSize);

	ResetSeedRow = FALSE;
}

Mode9::~Mode9()
{ }

////////////////////////////////////////////////////////////////////////////

typedef union {
    unsigned char comchar;  /* command byte as char */
    struct
    {
#if defined(APDK_LITTLE_ENDIAN) || defined(LITTLE_ENDIAN_HW)
        unsigned replace_count:3;   /* replace count 1-7, 8=8+next byte */
        unsigned roff:4;    /* relative offset 0-14, 15=15+next byte */
        unsigned type:1;      /* type of replacement: 0=mode0, 1=mode1 */
#else
        unsigned type:1;      /* type of replacement: 0=mode0, 1=mode1 */
        unsigned roff:4;    /* relative offset 0-14, 15=15+next byte */
        unsigned replace_count:3;   /* replace count 1-7, 8=8+next byte */
#endif
    } bitf0;
    struct
    {
#if defined(APDK_LITTLE_ENDIAN) || defined(LITTLE_ENDIAN_HW)
        unsigned replace_count:5;   /* replace count 2-32, 33=33+next byte */
        unsigned roff:2;    /* relative offset 0-2, 3=3+next byte */
        unsigned type:1;      /* type of replacement: 0=mode0, 1=mode1 */
#else
        unsigned type:1;      /* type of replacement: 0=mode0, 1=mode1 */
        unsigned roff:2;    /* relative offset 0-2, 3=3+next byte */
        unsigned replace_count:5;   /* replace count 2-32, 33=33+next byte */
#endif
    } bitf1;
} Mode9_comtype;


#define MIN(a,b)    (((a)>=(b))?(b):(a))



#define kPCLMode9           9

#define MAX_OFFSET0         14      /* Largest unscaled value an offset can have before extra byte is needed. */
#define OFFSET_START0       0
#define MAX_COUNT0          6       /* Largest unscaled value a count can have before extra byte is needed */
#define COUNT_START0        1       /* What a count of zero has a value of. */

#define MAX_OFFSET1         2
#define OFFSET_START1       0
#define MAX_COUNT1          30
#define COUNT_START1        2

//*********************************************************
// This is based on code that came from Kevin Hudson.

void Mode9::Flush()
{
    if (!seeded)
        return;

	compressedsize=0;

    iRastersReady=0;
    seeded=FALSE;
}

BOOL Mode9::Process(RASTERDATA* input)
// compresses input data,
// result in Mode9::compressbuf,
// updates compressedsize
{
    if (input==NULL || 
		(input->rasterdata[COLORTYPE_COLOR]==NULL && input->rasterdata[COLORTYPE_BLACK]==NULL))    // flushing pipeline
    {
        Flush();
        return FALSE;
    }
	else seeded = TRUE;

	if (!ResetSeedRow && input->rasterdata[myplane] == 0)
	{
		compressedsize=0;
		iRastersReady=1;
		return TRUE;
	}

	memset(compressBuf, 0, inputsize + inputsize/2);

    unsigned int originalsize=input->rastersize[myplane];
	unsigned int size=input->rastersize[myplane];
	unsigned int layer;

	//  Convert 8 bit per pixel data into 1 bit per pixel data
	if (myplane == COLORTYPE_BLACK)
	{
		if (input->rasterdata[myplane] == 0)
		{
			memset(originalKData, 0, inputsize);
			size = originalsize = inputsize;
		}
		else
		{
			size = originalsize = (input->rastersize[myplane]+7)/8;
			memset(originalKData, 0, size);

			int curBit = 0x80, curByte = 0;
			for (int i=0; i<input->rastersize[myplane]; i++)
			{
				if (input->rasterdata[myplane][i])
				{
					originalKData[curByte] |= curBit;
				}
				if (curBit == 0x01)
				{
					curByte++;
					curBit = 0x80;
				}
				else
				{
					curBit = curBit >> 1;
				}
			}
			ResetSeedRow = TRUE;
		}
	}
    if ((myphase) && (myphase->prev))       // if in pipeline, as opposed to autonomous call
	{
        layer = myphase->prev->Exec->iRastersDelivered;
	}
    else layer = 1;

	if (myplane == COLORTYPE_BLACK)
	{
		layer = 1;
	}

    layer--;    // using as offset
    char *sptr = (char *)(&SeedRow[size*layer]);

    BYTE *nptr;
	if (myplane == COLORTYPE_BLACK)
	{
		nptr = originalKData;
	}
	else
	{
		nptr = input->rasterdata[myplane];
	}
    BYTE *tempPtr;
    char last_byte;
    unsigned int    offset,byte_count,rem_count;
    Mode9_comtype       command;
    char* dest=    (char*) compressBuf;
    register char *dptr=dest;

    while ( size > 0 )
    {
        offset = 0;

        if (seeded)
        {
            /* find a difference between the seed row and this row. */
            while ((*sptr++ == *nptr++) && (offset < size) )
            {
                offset++;
            }
            sptr--;
            nptr--;
        }

        if ( offset >= size )   /* too far to find diff, bail */
          goto bail;

        size -= offset;

        if ((*nptr != nptr[1]) || (size < 2))   /************  if doing a mode 0 **********/
        {
            command.bitf0.type = 0;
            last_byte = *nptr++;   /* keep track of the last_byte */
            sptr++;        /* seed pointer must keep up with nptr */
            byte_count = 1;

            /* Now find all of the bytes in a row that don't match
               either a run of mode3 or mode 1.  A slight
               optimization here would be to not jump out of this
               run of mode 0 for a single mode 3 or two mode 1
               bytes if we have to jump right back into mode 0,
               especially if there are already 7 mode 0 bytes here
               (we've already spent the extra byte for the
               byte-count) */
            while ((*sptr++ != *nptr) && (last_byte != *nptr) && (byte_count < size))
            {
               byte_count++;
               last_byte = *nptr++;
            }
            sptr--;

            /* Adjust the count if the last_byte == current_byte.
               Save these bytes for the upcomming run of mode 1. */
            if ((byte_count < size) && (last_byte == (char)*nptr))
            {
                nptr--;  /* Now sptr points to first byte in the new run of mode 1. */
                sptr--;
                byte_count--;
            }

            size -= byte_count;
            /* Now output full command.  If offset is over 14 then
               need optional offset bytes.  If byte count is over 7
               then need optional byte count. */

            if (offset > (MAX_OFFSET0+OFFSET_START0))
                command.bitf0.roff = MAX_OFFSET0+1;
            else
                command.bitf0.roff = offset-OFFSET_START0;

            if (byte_count > (MAX_COUNT0+COUNT_START0))
                command.bitf0.replace_count = MAX_COUNT0+1;
            else
                command.bitf0.replace_count = byte_count-COUNT_START0;

            *dptr++ = command.comchar;

            if (offset > (MAX_OFFSET0+OFFSET_START0))
            {
                offset -= (MAX_OFFSET0+OFFSET_START0+1);
                if (offset == 0)
                {