libmng_display.c

奇趣公司比较新的qt/emd版本

        if (!iCliptype)                /* absolute ? */
        {
          pData->iFRAMclipl = iClipl;
          pData->iFRAMclipr = iClipr;
          pData->iFRAMclipt = iClipt;
          pData->iFRAMclipb = iClipb;
        }
        else                           /* relative */
        {
          pData->iFRAMclipl = pData->iFRAMclipl + iClipl;
          pData->iFRAMclipr = pData->iFRAMclipr + iClipr;
          pData->iFRAMclipt = pData->iFRAMclipt + iClipt;
          pData->iFRAMclipb = pData->iFRAMclipb + iClipb;
        }
      }
    }
    else
    {                                  /* reload defaults */
      pData->bFrameclipping = pData->bFRAMclipping;
      pData->iFrameclipl    = pData->iFRAMclipl;
      pData->iFrameclipr    = pData->iFRAMclipr;
      pData->iFrameclipt    = pData->iFRAMclipt;
      pData->iFrameclipb    = pData->iFRAMclipb;
    }
#endif
  }

  if (!pData->bTimerset)               /* timer still off ? */
  {
    if (
#ifndef MNG_SKIPCHUNK_FRAM
       (pData->iFramemode == 4) ||    /* insert background layer after a new frame */
#endif
        (!pData->iLayerseq))           /* and certainly before the very first layer */
      iRetcode = load_bkgdlayer (pData);

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

    pData->iFrameseq++;                /* count the frame ! */
    pData->bFramedone = MNG_TRUE;      /* and indicate we've done one */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_FRAME, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

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

MNG_LOCAL mng_retcode next_layer (mng_datap pData)
{
  mng_imagep  pImage;
  mng_retcode iRetcode = MNG_NOERROR;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_LAYER, MNG_LC_START);
#endif

#ifndef MNG_SKIPCHUNK_FRAM
  if (!pData->iBreakpoint)             /* no previous break here ? */
  {                                    /* interframe delay required ? */
    if ((pData->eImagetype == mng_it_mng) && (pData->iLayerseq) &&
        ((pData->iFramemode == 1) || (pData->iFramemode == 3)))
      iRetcode = interframe_delay (pData);
    else
      pData->iFramedelay = pData->iNextdelay;

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

  if (!pData->bTimerset)               /* timer still off ? */
  {
    if (!pData->iLayerseq)             /* restore background for the very first layer ? */
    {                                  /* wait till IDAT/JDAT for PNGs & JNGs !!! */
      if ((pData->eImagetype == mng_it_png) || (pData->eImagetype == mng_it_jng))
        pData->bRestorebkgd = MNG_TRUE;
      else
      {                                /* for MNG we do it right away */
        iRetcode = load_bkgdlayer (pData);
        pData->iLayerseq++;            /* and it counts as a layer then ! */
      }
    }
#ifndef MNG_SKIPCHUNK_FRAM
    else
    if (pData->iFramemode == 3)        /* restore background for each layer ? */
      iRetcode = load_bkgdlayer (pData);
#endif

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

#ifndef MNG_NO_DELTA_PNG
    if (pData->bHasDHDR)               /* processing a delta-image ? */
      pImage = (mng_imagep)pData->pDeltaImage;
    else
#endif
      pImage = (mng_imagep)pData->pCurrentobj;

    if (!pImage)                       /* not an active object ? */
      pImage = (mng_imagep)pData->pObjzero;
                                       /* determine display rectangle */
    pData->iDestl   = MAX_COORD ((mng_int32)0,   pImage->iPosx);
    pData->iDestt   = MAX_COORD ((mng_int32)0,   pImage->iPosy);
                                       /* is it a valid buffer ? */
    if ((pImage->pImgbuf->iWidth) && (pImage->pImgbuf->iHeight))
    {
      pData->iDestr = MIN_COORD ((mng_int32)pData->iWidth,
                                 pImage->iPosx + (mng_int32)pImage->pImgbuf->iWidth );
      pData->iDestb = MIN_COORD ((mng_int32)pData->iHeight,
                                 pImage->iPosy + (mng_int32)pImage->pImgbuf->iHeight);
    }
    else                               /* it's a single image ! */
    {
      pData->iDestr = MIN_COORD ((mng_int32)pData->iWidth,
                                 (mng_int32)pData->iDatawidth );
      pData->iDestb = MIN_COORD ((mng_int32)pData->iHeight,
                                 (mng_int32)pData->iDataheight);
    }

#ifndef MNG_SKIPCHUNK_FRAM
    if (pData->bFrameclipping)         /* frame clipping specified ? */
    {
      pData->iDestl = MAX_COORD (pData->iDestl,  pData->iFrameclipl);
      pData->iDestt = MAX_COORD (pData->iDestt,  pData->iFrameclipt);
      pData->iDestr = MIN_COORD (pData->iDestr,  pData->iFrameclipr);
      pData->iDestb = MIN_COORD (pData->iDestb,  pData->iFrameclipb);
    }
#endif

    if (pImage->bClipped)              /* is the image clipped itself ? */
    {
      pData->iDestl = MAX_COORD (pData->iDestl,  pImage->iClipl);
      pData->iDestt = MAX_COORD (pData->iDestt,  pImage->iClipt);
      pData->iDestr = MIN_COORD (pData->iDestr,  pImage->iClipr);
      pData->iDestb = MIN_COORD (pData->iDestb,  pImage->iClipb);
    }
                                       /* determine source starting point */
    pData->iSourcel = MAX_COORD ((mng_int32)0,   pData->iDestl - pImage->iPosx);
    pData->iSourcet = MAX_COORD ((mng_int32)0,   pData->iDestt - pImage->iPosy);

    if ((pImage->pImgbuf->iWidth) && (pImage->pImgbuf->iHeight))
    {                                  /* and maximum size  */
      pData->iSourcer = MIN_COORD ((mng_int32)pImage->pImgbuf->iWidth,
                                   pData->iSourcel + pData->iDestr - pData->iDestl);
      pData->iSourceb = MIN_COORD ((mng_int32)pImage->pImgbuf->iHeight,
                                   pData->iSourcet + pData->iDestb - pData->iDestt);
    }
    else                               /* it's a single image ! */
    {
      pData->iSourcer = pData->iSourcel + pData->iDestr - pData->iDestl;
      pData->iSourceb = pData->iSourcet + pData->iDestb - pData->iDestt;
    }

    pData->iLayerseq++;                /* count the layer ! */
  }

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_NEXT_LAYER, MNG_LC_END);
#endif

  return MNG_NOERROR;
}

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

mng_retcode mng_display_image (mng_datap  pData,
                               mng_imagep pImage,
                               mng_bool   bLayeradvanced)
{
  mng_retcode iRetcode;

#ifdef MNG_SUPPORT_TRACE
  MNG_TRACE (pData, MNG_FN_DISPLAY_IMAGE, MNG_LC_START);
#endif
                                       /* actively running ? */
#ifndef MNG_SKIPCHUNK_MAGN
  if (((pData->bRunning) || (pData->bSearching)) && (!pData->bSkipping))
  {
    if ( (!pData->iBreakpoint) &&      /* needs magnification ? */
         ( (pImage->iMAGN_MethodX) || (pImage->iMAGN_MethodY) ) )
    {
      iRetcode = mng_magnify_imageobject (pData, pImage);

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

  pData->pRetrieveobj = pImage;        /* so retrieve-row and color-correction can find it */

  if (!bLayeradvanced)                 /* need to advance the layer ? */
  {
    mng_imagep pSave    = pData->pCurrentobj;
    pData->pCurrentobj  = pImage;
    next_layer (pData);                /* advance to next layer */
    pData->pCurrentobj  = pSave;
  }
                                       /* need to restore the background ? */
  if ((!pData->bTimerset) && (pData->bRestorebkgd))
  {
    mng_imagep pSave    = pData->pCurrentobj;
    pData->pCurrentobj  = pImage;
    pData->bRestorebkgd = MNG_FALSE;
    iRetcode            = load_bkgdlayer (pData);
    pData->pCurrentobj  = pSave;

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

    pData->iLayerseq++;                /* and it counts as a layer then ! */
  }
                                       /* actively running ? */
  if (((pData->bRunning) || (pData->bSearching)) && (!pData->bSkipping))
  {
    if (!pData->bTimerset)             /* all systems still go ? */
    {
      pData->iBreakpoint = 0;          /* let's make absolutely sure... */
                                       /* anything to display ? */
      if ((pData->iDestr >= pData->iDestl) && (pData->iDestb >= pData->iDestt))
      {
        mng_int32 iY;

        set_display_routine (pData);   /* determine display routine */
                                       /* and image-buffer retrieval routine */
        switch (pImage->pImgbuf->iColortype)
        {
          case  0 : {
#ifndef MNG_NO_16BIT_SUPPORT
                      if (pImage->pImgbuf->iBitdepth > 8)
                        pData->fRetrieverow = (mng_fptr)mng_retrieve_g16;
                      else
#endif
                        pData->fRetrieverow = (mng_fptr)mng_retrieve_g8;

                      pData->bIsOpaque      = (mng_bool)(!pImage->pImgbuf->bHasTRNS);
                      break;
                    }

          case  2 : {
#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_bool)(!pImage->pImgbuf->bHasTRNS);
                      break;
                    }


          case  3 : { pData->fRetrieverow   = (mng_fptr)mng_retrieve_idx8;
                      pData->bIsOpaque      = (mng_bool)(!pImage->pImgbuf->bHasTRNS);
                      break;
                    }


          case  4 : {
#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  6 : {
#ifndef MNG_NO_16BIT_SUPPORT
                      if (pImage->pImgbuf->iBitdepth > 8)
                        pData->fRetrieverow = (mng_fptr)mng_retrieve_rgba16;
                      else
#endif
                        pData->fRetrieverow = (mng_fptr)mng_retriev