libmng_filter.c

Linux下的基于X11的图形开发环境。

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    if (!iC)
    {
      iC = 2;
      iB = *pRawi++;
      iN = 0;
      iS = 8;
    }

    iS -= 4;
    iQ = (mng_uint8)(((iB >> iS) + pData->iLevel0) & 0x0F);
    iN = (mng_uint8)((iN << 4) + iQ);
    iC--;

    if (!iC)
      *pRawo++ = iN;

  }

  if (iC)
    *pRawo = (mng_uint8)(iN << iS);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_G4, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_g8 (mng_datap pData)
{
  mng_uint8p pRawi, pRawo;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_G8, MNG_LC_START)
#endif

  pRawi = pData->pWorkrow + pData->iPixelofs;
  pRawo = pData->pPrevrow + pData->iPixelofs;

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *pRawo++ = (mng_uint8)(((mng_uint16)*pRawi + pData->iLevel0) & 0xFF);

    pRawi++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_G8, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_g16 (mng_datap pData)
{
  mng_uint16p pRawi, pRawo;
  mng_int32   iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_G16, MNG_LC_START)
#endif

  pRawi = (mng_uint16p)(pData->pWorkrow + pData->iPixelofs);
  pRawo = (mng_uint16p)(pData->pPrevrow + pData->iPixelofs);

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *pRawo++ = (mng_uint16)(((mng_uint32)*pRawi + (mng_uint32)pData->iLevel0) & 0xFFFF);

    pRawi++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_G16, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_rgb8 (mng_datap pData)
{
  mng_uint8p pRawi, pRawo;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_RGB8, MNG_LC_START)
#endif

  pRawi = pData->pWorkrow + pData->iPixelofs;
  pRawo = pData->pPrevrow + pData->iPixelofs;

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *(pRawo+1) = (mng_uint8)(((mng_uint16)*(pRawi+1) + pData->iLevel1) & 0xFF);
    *pRawo     = (mng_uint8)(((mng_uint16)*pRawi     + pData->iLevel0 +
                              (mng_uint16)*(pRawo+1)) & 0xFF);
    *(pRawo+2) = (mng_uint8)(((mng_uint16)*(pRawi+2) + pData->iLevel2 +
                              (mng_uint16)*(pRawo+1)) & 0xFF);

    pRawi += 3;
    pRawo += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_RGB8, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_rgb16 (mng_datap pData)
{
  mng_uint16p pRawi, pRawo;
  mng_int32   iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_RGB16, MNG_LC_START)
#endif

  pRawi = (mng_uint16p)(pData->pWorkrow + pData->iPixelofs);
  pRawo = (mng_uint16p)(pData->pPrevrow + pData->iPixelofs);

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *(pRawo+1) = (mng_uint16)(((mng_uint32)*(pRawi+1) + (mng_uint32)pData->iLevel1) & 0xFFFF);
    *pRawo     = (mng_uint16)(((mng_uint32)*pRawi     + (mng_uint32)pData->iLevel0 +
                               (mng_uint32)*(pRawo+1)) & 0xFFFF);
    *(pRawo+2) = (mng_uint16)(((mng_uint32)*(pRawi+2) + (mng_uint32)pData->iLevel2 +
                               (mng_uint32)*(pRawo+1)) & 0xFFFF);

    pRawi += 3;
    pRawo += 3;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_RGB16, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_idx1 (mng_datap pData)
{
  mng_uint8p pRawi, pRawo;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_IDX1, MNG_LC_START)
#endif

  if (pData->iLevel0 & 0x01)           /* is it uneven level ? */
  {
    pRawi = pData->pWorkrow + pData->iPixelofs;
    pRawo = pData->pPrevrow + pData->iPixelofs;
                                       /* just invert every bit */
    for (iX = 0; iX < pData->iRowsize; iX++)
      *pRawo++ = (mng_uint8)(~(*pRawi++));

  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_IDX1, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_idx2 (mng_datap pData)
{
  mng_uint8p pRawi, pRawo;
  mng_int32  iX;
  mng_int32  iC, iS;
  mng_uint8  iB, iN, iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_IDX2, MNG_LC_START)
#endif

  pRawi = pData->pWorkrow + pData->iPixelofs;
  pRawo = pData->pPrevrow + pData->iPixelofs;
  iC    = 0;
  iB    = 0;
  iN    = 0;
  iS    = 0;

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    if (!iC)
    {
      iC = 4;
      iB = *pRawi++;
      iN = 0;
      iS = 8;
    }

    iS -= 2;
    iQ = (mng_uint8)(((iB >> iS) + pData->iLevel0) & 0x03);
    iN = (mng_uint8)((iN << 2) + iQ);
    iC--;

    if (!iC)
      *pRawo++ = iN;

  }

  if (iC)
    *pRawo = (mng_uint8)(iN << iS);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_IDX2, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_idx4 (mng_datap pData)
{
  mng_uint8p pRawi, pRawo;
  mng_int32  iX;
  mng_int32  iC, iS;
  mng_uint8  iB, iN, iQ;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_IDX4, MNG_LC_START)
#endif

  pRawi = pData->pWorkrow + pData->iPixelofs;
  pRawo = pData->pPrevrow + pData->iPixelofs;
  iC    = 0;
  iB    = 0;
  iN    = 0;
  iS    = 0;

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    if (!iC)
    {
      iC = 2;
      iB = *pRawi++;
      iN = 0;
      iS = 8;
    }

    iS -= 4;
    iQ = (mng_uint8)(((iB >> iS) + pData->iLevel0) & 0x0F);
    iN = (mng_uint8)((iN << 4) + iQ);
    iC--;

    if (!iC)
      *pRawo++ = iN;

  }

  if (iC)
    *pRawo = (mng_uint8)(iN << iS);

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_IDX4, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_idx8 (mng_datap pData)
{
  mng_uint8p pRawi, pRawo;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_IDX8, MNG_LC_START)
#endif

  pRawi = pData->pWorkrow + pData->iPixelofs;
  pRawo = pData->pPrevrow + pData->iPixelofs;

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *pRawo++ = (mng_uint8)(((mng_uint16)*pRawi + pData->iLevel0) & 0xFF);

    pRawi++;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_IDX8, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_ga8 (mng_datap pData)
{
  mng_uint8p pRawi, pRawo;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_GA8, MNG_LC_START)
#endif

  pRawi = pData->pWorkrow + pData->iPixelofs;
  pRawo = pData->pPrevrow + pData->iPixelofs;

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *pRawo     = (mng_uint8)(((mng_uint16)*pRawi     + pData->iLevel0) & 0xFF);
    *(pRawo+1) = (mng_uint8)(((mng_uint16)*(pRawi+1) + pData->iLevel1) & 0xFF);

    pRawi += 2;
    pRawo += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_GA8, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_ga16 (mng_datap pData)
{
  mng_uint16p pRawi, pRawo;
  mng_int32   iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_GA16, MNG_LC_START)
#endif

  pRawi = (mng_uint16p)(pData->pWorkrow + pData->iPixelofs);
  pRawo = (mng_uint16p)(pData->pPrevrow + pData->iPixelofs);

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *pRawo     = (mng_uint16)(((mng_uint32)*pRawi     + (mng_uint32)pData->iLevel0) & 0xFFFF);
    *(pRawo+1) = (mng_uint16)(((mng_uint32)*(pRawi+1) + (mng_uint32)pData->iLevel1) & 0xFFFF);

    pRawi += 2;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_GA16, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_rgba8 (mng_datap pData)
{
  mng_uint8p pRawi, pRawo;
  mng_int32  iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_RGBA8, MNG_LC_START)
#endif

  pRawi = pData->pWorkrow + pData->iPixelofs;
  pRawo = pData->pPrevrow + pData->iPixelofs;

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *(pRawo+1) = (mng_uint8)(((mng_uint16)*(pRawi+1) + pData->iLevel1) & 0xFF);
    *pRawo     = (mng_uint8)(((mng_uint16)*pRawi     + pData->iLevel0 +
                              (mng_uint16)*(pRawo+1)) & 0xFF);
    *(pRawo+2) = (mng_uint8)(((mng_uint16)*(pRawi+2) + pData->iLevel2 +
                              (mng_uint16)*(pRawo+1)) & 0xFF);
    *(pRawo+3) = (mng_uint8)(((mng_uint16)*(pRawi+3) + pData->iLevel3) & 0xFF);

    pRawi += 4;
    pRawo += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_RGBA8, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

mng_retcode differ_rgba16 (mng_datap pData)
{
  mng_uint16p pRawi, pRawo;
  mng_int32   iX;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_RGBA16, MNG_LC_START)
#endif

  pRawi = (mng_uint16p)(pData->pWorkrow + pData->iPixelofs);
  pRawo = (mng_uint16p)(pData->pPrevrow + pData->iPixelofs);

  for (iX = 0; iX < pData->iRowsamples; iX++)
  {
    *(pRawo+1) = (mng_uint16)(((mng_uint32)*(pRawi+1) + (mng_uint32)pData->iLevel1) & 0xFFFF);
    *pRawo     = (mng_uint16)(((mng_uint32)*pRawi     + (mng_uint32)pData->iLevel0 +
                               (mng_uint32)*(pRawo+1)) & 0xFFFF);
    *(pRawo+2) = (mng_uint16)(((mng_uint32)*(pRawi+2) + (mng_uint32)pData->iLevel2 +
                               (mng_uint32)*(pRawo+1)) & 0xFFFF);
    *(pRawo+3) = (mng_uint16)(((mng_uint32)*(pRawi+3) + (mng_uint32)pData->iLevel3) & 0xFFFF);

    pRawi += 4;
    pRawo += 4;
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DIFFER_RGBA16, MNG_LC_END)
#endif

  return MNG_NOERROR;
}

/* ************************************************************************** */

#endif /* MNG_INCLUDE_FILTERS */

/* ************************************************************************** */
/* * end of file                                                            * */
/* ************************************************************************** */