libmng_display.c

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              case 10 : {
#ifndef MNG_NO_16BIT_SUPPORT
                          if (pImage->pImgbuf->iBitdepth > 8)
                            pData->fRetrieverow = (mng_fptr)mng_retrieve_rgb16;
                          else
#endif
                            pData->fRetrieverow = (mng_fptr)mng_retrieve_rgb8;

                          pData->bIsOpaque      = MNG_TRUE;
                          break;
                        }

              case 12 : {
#ifndef MNG_NO_16BIT_SUPPORT
                          if (pImage->pImgbuf->iBitdepth > 8)
                            pData->fRetrieverow = (mng_fptr)mng_retrieve_ga16;
                          else
#endif
                            pData->fRetrieverow = (mng_fptr)mng_retrieve_ga8;

                          pData->bIsOpaque      = MNG_FALSE;
                          break;
                        }

              case 14 : {
#ifndef MNG_NO_16BIT_SUPPORT
                          if (pImage->pImgbuf->iBitdepth > 8)
                            pData->fRetrieverow = (mng_fptr)mng_retrieve_rgba16;
                          else
#endif
                            pData->fRetrieverow = (mng_fptr)mng_retrieve_rgba8;

                          pData->bIsOpaque      = MNG_FALSE;
                          break;
                        }
            }

#ifdef MNG_NO_CMS
            iRetcode = MNG_NOERROR;
#else
#if defined(MNG_FULL_CMS)              /* determine color-management routine */
            iRetcode = mng_init_full_cms   (pData, MNG_FALSE, MNG_FALSE, MNG_TRUE);
#elif defined(MNG_GAMMA_ONLY)
            iRetcode = mng_init_gamma_only (pData, MNG_FALSE, MNG_FALSE, MNG_TRUE);
#elif defined(MNG_APP_CMS)
            iRetcode = mng_init_app_cms    (pData, MNG_FALSE, MNG_FALSE, MNG_TRUE);
#endif
            if (iRetcode)              /* on error bail out */
              return iRetcode;
#endif /* MNG_NO_CMS */
                                       /* get temporary row-buffers */
            MNG_ALLOC (pData, pData->pPrevrow, pData->iRowsize)
            MNG_ALLOC (pData, pData->pRGBArow, pData->iRowsize)

            iY       = pData->iDestt;  /* this is where we start */
            iRetcode = MNG_NOERROR;    /* so far, so good */

            while ((!iRetcode) && (iY < pData->iDestb))
            {                          /* restore a background row */
              iRetcode = mng_restore_bkgd_backimage (pData);
                                       /* color correction ? */
              if ((!iRetcode) && (pData->fCorrectrow))
                iRetcode = ((mng_correctrow)pData->fCorrectrow) (pData);

              if (!iRetcode)           /* so... display it */
                iRetcode = ((mng_displayrow)pData->fDisplayrow) (pData);

              if (!iRetcode)
                iRetcode = mng_next_row (pData);

              iY++;                    /* and next line */
            }
                                       /* drop temporary row-buffers */
            MNG_FREE (pData, pData->pRGBArow, pData->iRowsize)
            MNG_FREE (pData, pData->pPrevrow, pData->iRowsize)

            if (iRetcode)              /* on error bail out */
              return iRetcode;

#if defined(MNG_FULL_CMS)              /* cleanup cms stuff */
            iRetcode = mng_clear_cms (pData);

            if (iRetcode)              /* on error bail out */
              return iRetcode;
#endif
          }
        }
      }
#endif
    }

    pData->iDestl       = iDestl;      /* restore values */
    pData->iDestr       = iDestr;
    pData->iDestt       = iDestt;
    pData->iDestb       = iDestb;
    pData->iSourcel     = iSourcel;
    pData->iSourcer     = iSourcer;
    pData->iSourcet     = iSourcet;
    pData->iSourceb     = iSourceb;
    pData->iPass        = iPass;
    pData->iRow         = iRow;
    pData->iRowinc      = iRowinc;
    pData->iCol         = iCol;
    pData->iColinc      = iColinc;
    pData->iRowsamples  = iRowsamples;
    pData->iRowsize     = iRowsize;
    pData->pPrevrow     = pPrevrow;
    pData->pRGBArow     = pRGBArow;
    pData->bIsRGBA16    = bIsRGBA16;
    pData->bIsOpaque    = bIsOpaque;
    pData->fCorrectrow  = fCorrectrow;
    pData->fDisplayrow  = fDisplayrow; 
    pData->fRetrieverow = fRetrieverow;
    pData->pCurrentobj  = pCurrentobj;
    pData->pRetrieveobj = pRetrieveobj;
  }

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

  return MNG_NOERROR;
}

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

MNG_LOCAL mng_retcode clear_canvas (mng_datap pData)
{
  mng_int32   iY;
  mng_retcode iRetcode;

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

  pData->iDestl      = 0;              /* clipping region is full canvas! */
  pData->iDestt      = 0;
  pData->iDestr      = pData->iWidth;
  pData->iDestb      = pData->iHeight;

  pData->iSourcel    = 0;              /* source is same as destination */
  pData->iSourcer    = pData->iWidth;
  pData->iSourcet    = 0;
  pData->iSourceb    = pData->iHeight;

  pData->iPass       = -1;             /* these are the object's dimensions now */
  pData->iRow        = 0;
  pData->iRowinc     = 1;
  pData->iCol        = 0;
  pData->iColinc     = 1;
  pData->iRowsamples = pData->iWidth;
  pData->iRowsize    = pData->iRowsamples << 2;
  pData->bIsRGBA16   = MNG_FALSE;      /* let's keep it simple ! */
  pData->bIsOpaque   = MNG_TRUE;

  set_display_routine (pData);         /* determine display routine */
                                       /* get a temporary row-buffer */
                                       /* it's transparent black by default!! */
  MNG_ALLOC (pData, pData->pRGBArow, pData->iRowsize)

  iY       = pData->iDestt;            /* this is where we start */
  iRetcode = MNG_NOERROR;              /* so far, so good */

  while ((!iRetcode) && (iY < pData->iDestb))
  {                                    /* clear a row then */
    iRetcode = ((mng_displayrow)pData->fDisplayrow) (pData);

    if (!iRetcode)
      iRetcode = mng_next_row (pData); /* adjust variables for next row */

    iY++;                              /* and next line */
  }
                                       /* drop the temporary row-buffer */
  MNG_FREE (pData, pData->pRGBArow, pData->iRowsize)

  if (iRetcode)                        /* on error bail out */
    return iRetcode;

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

  return MNG_NOERROR;
}

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

MNG_LOCAL mng_retcode next_frame (mng_datap  pData,
                                  mng_uint8  iFramemode,
                                  mng_uint8  iChangedelay,
                                  mng_uint32 iDelay,
                                  mng_uint8  iChangetimeout,
                                  mng_uint32 iTimeout,
                                  mng_uint8  iChangeclipping,
                                  mng_uint8  iCliptype,
                                  mng_int32  iClipl,
                                  mng_int32  iClipr,
                                  mng_int32  iClipt,
                                  mng_int32  iClipb)
{
  mng_retcode iRetcode = MNG_NOERROR;

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

  if (!pData->iBreakpoint)             /* no previous break here ? */
  {
    mng_uint8 iOldmode = pData->iFramemode;
                                       /* interframe delay required ? */
#ifndef MNG_SKIPCHUNK_FRAM
    if ((iOldmode == 2) || (iOldmode == 4))
    {
      if ((pData->iFrameseq) && (iFramemode != 1) && (iFramemode != 3))
        iRetcode = interframe_delay (pData);
      else
        pData->iFramedelay = pData->iNextdelay;
    }
    else
    {                                  /* delay before inserting background layer? */
      if ((pData->bFramedone) && (iFramemode == 4))
        iRetcode = interframe_delay (pData);
    }

    if (iRetcode)                      /* on error bail out */
      return iRetcode;
                                       /* now we'll assume we're in the next frame! */
    if (iFramemode)                    /* save the new framing mode ? */
    {
      pData->iFRAMmode  = iFramemode;
      pData->iFramemode = iFramemode;
    }
    else                               /* reload default */
      pData->iFramemode = pData->iFRAMmode;

    if (iChangedelay)                  /* delay changed ? */
    {
      pData->iNextdelay = iDelay;      /* for *after* next subframe */

      if ((iOldmode == 2) || (iOldmode == 4))
        pData->iFramedelay = pData->iFRAMdelay;

      if (iChangedelay == 2)           /* also overall ? */
        pData->iFRAMdelay = iDelay;
    }
    else
    {                                  /* reload default */
      pData->iNextdelay = pData->iFRAMdelay;
    }

    if (iChangetimeout)                /* timeout changed ? */
    {                                  /* for next subframe */
      pData->iFrametimeout = iTimeout;

      if ((iChangetimeout == 2) ||     /* also overall ? */
          (iChangetimeout == 4) ||
          (iChangetimeout == 6) ||
          (iChangetimeout == 8))
        pData->iFRAMtimeout = iTimeout;
    }
    else                               /* reload default */
      pData->iFrametimeout = pData->iFRAMtimeout;

    if (iChangeclipping)               /* clipping changed ? */
    {
      pData->bFrameclipping = MNG_TRUE;

      if (!iCliptype)                  /* absolute ? */
      {
        pData->iFrameclipl = iClipl;
        pData->iFrameclipr = iClipr;
        pData->iFrameclipt = iClipt;
        pData->iFrameclipb = iClipb;
      }
      else                             /* relative */
      {
        pData->iFrameclipl = pData->iFrameclipl + iClipl;
        pData->iFrameclipr = pData->iFrameclipr + iClipr;
        pData->iFrameclipt = pData->iFrameclipt + iClipt;
        pData->iFrameclipb = pData->iFrameclipb + iClipb;
      }