libmng_object_prc.c

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  {
    if (iLocationtype == 0)            /* absolute position ? */
    {
      pNew->iPosx        = iLocationx;
      pNew->iPosy        = iLocationy;
    }
    else                               /* relative */
    {
      pNew->iPosx        = pSource->iPosx + iLocationx;
      pNew->iPosy        = pSource->iPosy + iLocationy;
    }
  }
  else                                 /* copy from source */
  {
    pNew->iPosx          = pSource->iPosx;
    pNew->iPosy          = pSource->iPosy;
  }
                                       /* copy clipping info */
  pNew->bClipped         = pSource->bClipped;
  pNew->iClipl           = pSource->iClipl;
  pNew->iClipr           = pSource->iClipr;
  pNew->iClipt           = pSource->iClipt;
  pNew->iClipb           = pSource->iClipb;
#ifndef MNG_SKIPCHUNK_MAGN
                                       /* copy magnification info */
/*  pNew->iMAGN_MethodX    = pSource->iMAGN_MethodX;     LET'S NOT !!!!!!
  pNew->iMAGN_MethodY    = pSource->iMAGN_MethodY;
  pNew->iMAGN_MX         = pSource->iMAGN_MX;
  pNew->iMAGN_MY         = pSource->iMAGN_MY;
  pNew->iMAGN_ML         = pSource->iMAGN_ML;
  pNew->iMAGN_MR         = pSource->iMAGN_MR;
  pNew->iMAGN_MT         = pSource->iMAGN_MT;
  pNew->iMAGN_MB         = pSource->iMAGN_MB; */
#endif

#ifndef MNG_SKIPCHUNK_PAST
  pNew->iPastx           = 0;          /* initialize PAST info */
  pNew->iPasty           = 0;
#endif

  if (iId)                             /* not for object 0 */
  {                                    /* find previous lower object-id */
    pPrev = (mng_imagep)pData->pLastimgobj;
    while ((pPrev) && (pPrev->iId > iId))
      pPrev = (mng_imagep)pPrev->sHeader.pPrev;

    if (pPrev)                         /* found it ? */
    {
      pNew->sHeader.pPrev  = pPrev;    /* than link it in place */
      pNew->sHeader.pNext  = pPrev->sHeader.pNext;
      pPrev->sHeader.pNext = pNew;
    }
    else                               /* if not found, it becomes the first ! */
    {
      pNew->sHeader.pNext  = pData->pFirstimgobj;
      pData->pFirstimgobj  = pNew;
    }

    pNext                  = (mng_imagep)pNew->sHeader.pNext;

    if (pNext)
      pNext->sHeader.pPrev = pNew;
    else
      pData->pLastimgobj   = pNew;

  }

  if (bPartial)                        /* partial clone ? */
  {
    pNew->pImgbuf = pSource->pImgbuf;  /* use the same object buffer */
    pNew->pImgbuf->iRefcount++;        /* and increase the reference count */
  }
  else                                 /* create a full clone ! */
  {
    mng_bool bConcrete = MNG_FALSE;    /* it's abstract by default (?) */

    if (!bAbstract)                    /* determine concreteness from source ? */
      bConcrete = pSource->pImgbuf->bConcrete;
                                       /* create a full clone ! */
    iRetcode = mng_clone_imagedataobject (pData, bConcrete, pSource->pImgbuf, &pImgbuf);

    if (iRetcode)                      /* on error bail out */
    {
      MNG_FREEX (pData, pNew, sizeof (mng_image))
      return iRetcode;
    }

    pNew->pImgbuf = pImgbuf;           /* and remember it */
  }

  *ppClone = pNew;                     /* return it */

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

  return MNG_NOERROR;
}

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

mng_retcode mng_renum_imageobject (mng_datap  pData,
                                   mng_imagep pSource,
                                   mng_uint16 iId,
                                   mng_bool   bVisible,
                                   mng_bool   bAbstract,
                                   mng_bool   bHasloca,
                                   mng_uint8  iLocationtype,
                                   mng_int32  iLocationx,
                                   mng_int32  iLocationy)
{
  mng_imagep pPrev, pNext;

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

  pSource->bVisible  = bVisible;       /* store the new visibility */

  if (bHasloca)                        /* location info available ? */
  {
    if (iLocationtype == 0)            /* absolute position ? */
    {
      pSource->iPosx = iLocationx;
      pSource->iPosy = iLocationy;
    }
    else                               /* relative */
    {
      pSource->iPosx = pSource->iPosx + iLocationx;
      pSource->iPosy = pSource->iPosy + iLocationy;
    }
  }

  if (iId)                             /* not for object 0 */
  {                                    /* find previous lower object-id */
    pPrev = (mng_imagep)pData->pLastimgobj;
    while ((pPrev) && (pPrev->iId > iId))
      pPrev = (mng_imagep)pPrev->sHeader.pPrev;
                                       /* different from current ? */
    if (pPrev != (mng_imagep)pSource->sHeader.pPrev)
    {
      if (pSource->sHeader.pPrev)      /* unlink from current position !! */
        ((mng_imagep)pSource->sHeader.pPrev)->sHeader.pNext = pSource->sHeader.pNext;
      else
        pData->pFirstimgobj                                 = pSource->sHeader.pNext;

      if (pSource->sHeader.pNext)
        ((mng_imagep)pSource->sHeader.pNext)->sHeader.pPrev = pSource->sHeader.pPrev;
      else
        pData->pLastimgobj                                  = pSource->sHeader.pPrev;

      if (pPrev)                       /* found the previous ? */
      {                                /* than link it in place */
        pSource->sHeader.pPrev = pPrev;
        pSource->sHeader.pNext = pPrev->sHeader.pNext;
        pPrev->sHeader.pNext   = pSource;
      }
      else                             /* if not found, it becomes the first ! */
      {
        pSource->sHeader.pNext = pData->pFirstimgobj;
        pData->pFirstimgobj    = pSource;
      }

      pNext                    = (mng_imagep)pSource->sHeader.pNext;

      if (pNext)
        pNext->sHeader.pPrev   = pSource;
      else
        pData->pLastimgobj     = pSource;

    }
  }

  pSource->iId = iId;                  /* now set the new id! */

  if (bAbstract)                       /* force it to abstract ? */
    pSource->pImgbuf->bConcrete = MNG_FALSE;

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

  return MNG_NOERROR;
}

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

mng_retcode mng_reset_object_details (mng_datap  pData,
                                      mng_imagep pImage,
                                      mng_uint32 iWidth,
                                      mng_uint32 iHeight,
                                      mng_uint8  iBitdepth,
                                      mng_uint8  iColortype,
                                      mng_uint8  iCompression,
                                      mng_uint8  iFilter,
                                      mng_uint8  iInterlace,
                                      mng_bool   bResetall)
{
  mng_imagedatap pBuf  = pImage->pImgbuf;
  mng_uint32     iSamplesize = 0;
  mng_uint32     iRowsize;
  mng_uint32     iImgdatasize;

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

  pBuf->iWidth         = iWidth;       /* set buffer characteristics */
  pBuf->iHeight        = iHeight;
  pBuf->iBitdepth      = iBitdepth;
  pBuf->iColortype     = iColortype;
  pBuf->iCompression   = iCompression;
  pBuf->iFilter        = iFilter;
  pBuf->iInterlace     = iInterlace;
  pBuf->bCorrected     = MNG_FALSE;
  pBuf->iAlphabitdepth = 0;
                                       /* determine samplesize from color_type/bit_depth */
  switch (iColortype)                  /* for < 8-bit samples we just reserve 8 bits */
  {
    case  0  : ;                       /* gray */
    case  8  : {                       /* JPEG gray */
#ifndef MNG_NO_16BIT_SUPPORT
                 if (iBitdepth > 8)
                   iSamplesize = 2;
                 else
#endif
                   iSamplesize = 1;

                 break;
               }
    case  2  : ;                       /* rgb */
    case 10  : {                       /* JPEG rgb */
#ifndef MNG_NO_16BIT_SUPPORT
                 if (iBitdepth > 8)
                   iSamplesize = 6;
                 else
#endif
                   iSamplesize = 3;

                 break;
               }
    case  3  : {                       /* indexed */
                 iSamplesize = 1;
                 break;
               }
    case  4  : ;                       /* gray+alpha */
    case 12  : {                       /* JPEG gray+alpha */
#ifndef MNG_NO_16BIT_SUPPORT
                 if (iBitdepth > 8)
                   iSamplesize = 4;
                 else
#endif
                   iSamplesize = 2;

                 break;
               }
    case  6  : ;                       /* rgb+alpha */
    case 14  : {                       /* JPEG rgb+alpha */
#ifndef MNG_NO_16BIT_SUPPORT
                 if (iBitdepth > 8)
                   iSamplesize = 8;
                 else
#endif
                   iSamplesize = 4;

                 break;
               }
  }

  iRowsize     = iSamplesize * iWidth;
  iImgdatasize = iRowsize    * iHeight;
                                       /* buffer size changed ? */
  if (iImgdatasize != pBuf->iImgdatasize)
  {                                    /* drop the old one */
    MNG_FREE (pData, pBuf->pImgdata, pBuf->iImgdatasize)

    if (iImgdatasize)                  /* allocate new sample-buffer ? */
      MNG_ALLOC (pData, pBuf->pImgdata, iImgdatasize)
  }
  else
  {
    if (iImgdatasize)                  /* clear old buffer */
    {
      mng_uint8p pTemp = pBuf->pImgdata;
      mng_uint32 iX;
      
      for (iX = 0; iX < (iImgdatasize & (mng_uint32)(~3L)); iX += 4)
      {
        *((mng_uint32p)pTemp) = 0x00000000l;
        pTemp += 4;
      }

      while (pTemp < (pBuf->pImgdata + iImgdatasize))
      {
        *pTemp = 0;
        pTemp++;
      }
    }
  }

  pBuf->iSamplesize  = iSamplesize;    /* remember new sizes */
  pBuf->iRowsize     = iRowsize;
  pBuf->iImgdatasize = iImgdatasize;

  if (!pBuf->iPixelsampledepth)        /* set delta sampledepths if empty */
    pBuf->iPixelsampledepth = iBitdepth;
  if (!pBuf->iAlphasampledepth)
    pBuf->iAlphasampledepth = iBitdepth;
                                       /* dimension set and clipping not ? */
  if ((iWidth) && (iHeight) && (!pImage->bClipped))
  {
    pImage->iClipl   = 0;              /* set clipping to dimension by default */
    pImage->iClipr   = iWidth;
    pImage->iClipt   = 0;
    pImage->iClipb   = iHeight;
  }

#ifndef MNG_SKIPCHUNK_MAGN
  if (pImage->iId)                     /* reset magnification info ? */
  {
    pImage->iMAGN_MethodX = 0;
    pImage->iMAGN_MethodY = 0;
    pImage->iMAGN_MX      = 0;
    pImage->iMAGN_MY      = 0;
    pImage->iMAGN_ML      = 0;
    pImage->iMAGN_MR      = 0;
    pImage->iMAGN_MT      = 0;
    pImage->iMAGN_MB      = 0;
  }
#endif

  if (bResetall)                       /* reset the other characteristics ? */
  {
#ifndef MNG_SKIPCHUNK_PAST
    pImage->iPastx = 0;
    pImage->iPasty = 0;
#endif

    pBuf->bHasPLTE = MNG_FALSE;
    pBuf->bHasTRNS = MNG_FALSE;
    pBuf->bHasGAMA = pData->bHasglobalGAMA;
#ifndef MNG_SKIPCHUNK_cHRM
    pBuf->bHasCHRM = pData->bHasglobalCHRM;
#endif
    pBuf->bHasSRGB = pData->bHasglobalSRGB;
#ifndef MNG_SKIPCHUNK_iCCP