libmng_display.c

奇趣公司比较新的qt/emd版本

    mng_fptr    fCorrectrow  = pData->fCorrectrow;
    mng_fptr    fDisplayrow  = pData->fDisplayrow;
    mng_fptr    fRetrieverow = pData->fRetrieverow;
    mng_objectp pCurrentobj  = pData->pCurrentobj;
    mng_objectp pRetrieveobj = pData->pRetrieveobj;

    pData->iDestl   = 0;               /* determine clipping region */
    pData->iDestt   = 0;
    pData->iDestr   = pData->iWidth;
    pData->iDestb   = pData->iHeight;

#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
                                       /* anything to clear ? */
    if ((pData->iDestr >= pData->iDestl) && (pData->iDestb >= pData->iDestt))
    {
      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;

      pData->iSourcel    = 0;          /* source relative to destination */
      pData->iSourcer    = pData->iDestr - pData->iDestl;
      pData->iSourcet    = 0;
      pData->iSourceb    = pData->iDestb - pData->iDestt;

      set_display_routine (pData);     /* determine display routine */
                                       /* default restore using preset BG color */
      pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_bgcolor;

#ifndef MNG_SKIPCHUNK_bKGD
      if (((pData->eImagetype == mng_it_png) || (pData->eImagetype == mng_it_jng)) &&
          (pData->bUseBKGD))
      {                                /* prefer bKGD in PNG/JNG */
        if (!pData->pCurrentobj)
          pData->pCurrentobj = pData->pObjzero;

        if (((mng_imagep)pData->pCurrentobj)->pImgbuf->bHasBKGD)
        {
          pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_bkgd;
          bColorcorr          = MNG_TRUE;
        }
      }
#endif

      if (pData->fGetbkgdline)         /* background-canvas-access callback set ? */
      {
        switch (pData->iBkgdstyle)
        {
#ifndef MNG_SKIPCANVAS_RGB8
          case MNG_CANVAS_RGB8    : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_rgb8;    break; }
#endif
#ifndef MNG_SKIPCANVAS_BGR8
          case MNG_CANVAS_BGR8    : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_bgr8;    break; }
#endif
#ifndef MNG_SKIPCANVAS_BGRX8
          case MNG_CANVAS_BGRX8   : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_bgrx8;   break; }
#endif
#ifndef MNG_SKIPCANVAS_BGR565
          case MNG_CANVAS_BGR565  : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_bgr565;  break; }
#endif
#ifndef MNG_SKIPCANVAS_RGB565
          case MNG_CANVAS_RGB565  : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_rgb565;  break; }
#endif
#ifndef MNG_NO_16BIT_SUPPORT
  /*        case MNG_CANVAS_RGB16   : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_rgb16;   break; } */
  /*        case MNG_CANVAS_BGR16   : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_bgr16;   break; } */
#endif
  /*        case MNG_CANVAS_INDEX8  : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_index8;  break; } */
  /*        case MNG_CANVAS_GRAY8   : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_gray8;   break; } */
#ifndef MNG_NO_16BIT_SUPPORT
  /*        case MNG_CANVAS_GRAY16  : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_gray16;  break; } */
#endif
  /*        case MNG_CANVAS_DX15    : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_dx15;    break; } */
  /*        case MNG_CANVAS_DX16    : { pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_dx16;    break; } */
        }
      }

#ifndef MNG_SKIPCHUNK_BACK
      if (pData->bHasBACK)
      {                                /* background image ? */
        if ((pData->iBACKmandatory & 0x02) && (pData->iBACKimageid))
        {
          pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_backcolor;
          bColorcorr          = MNG_TRUE;
        }
        else                           /* background color ? */
        if (pData->iBACKmandatory & 0x01)
        {
          pData->fRestbkgdrow = (mng_fptr)mng_restore_bkgd_backcolor;
          bColorcorr          = MNG_TRUE;
        }
      }
#endif

      pData->fCorrectrow = MNG_NULL;   /* default no color-correction */

      if (bColorcorr)                  /* do we have to do color-correction ? */
      {
#ifdef MNG_NO_CMS
        iRetcode = MNG_NOERROR;
#else
#if defined(MNG_FULL_CMS)              /* determine color-management routine */
        iRetcode = mng_init_full_cms   (pData, MNG_TRUE, MNG_FALSE, MNG_FALSE);
#elif defined(MNG_GAMMA_ONLY)
        iRetcode = mng_init_gamma_only (pData, MNG_TRUE, MNG_FALSE, MNG_FALSE);
#elif defined(MNG_APP_CMS)
        iRetcode = mng_init_app_cms    (pData, MNG_TRUE, MNG_FALSE, MNG_FALSE);
#endif
        if (iRetcode)                  /* on error bail out */
          return iRetcode;
#endif /* MNG_NO_CMS */
      }
                                       /* get a temporary row-buffer */
      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_restbkgdrow)pData->fRestbkgdrow) (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 the temporary row-buffer */
      MNG_FREE (pData, pData->pRGBArow, pData->iRowsize);

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

#if defined(MNG_FULL_CMS)              /* cleanup cms stuff */
      if (bColorcorr)                  /* did we do color-correction ? */
      {
        iRetcode = mng_clear_cms (pData);

        if (iRetcode)                  /* on error bail out */
          return iRetcode;
      }
#endif
#ifndef MNG_SKIPCHUNK_BACK
                                       /* background image ? */
      if ((pData->bHasBACK) && (pData->iBACKmandatory & 0x02) && (pData->iBACKimageid))
      {
        mng_imagep pImage;
                                       /* let's find that object then */
        pData->pRetrieveobj = mng_find_imageobject (pData, pData->iBACKimageid);
        pImage              = (mng_imagep)pData->pRetrieveobj;
                                       /* exists, viewable and visible ? */
        if ((pImage) && (pImage->bViewable) && (pImage->bVisible))
        {                              /* will it fall within the target region ? */
          if ((pImage->iPosx < pData->iDestr) && (pImage->iPosy < pData->iDestb)             &&
              ((pData->iBACKtile) ||
               ((pImage->iPosx + (mng_int32)pImage->pImgbuf->iWidth  >= pData->iDestl) &&
                (pImage->iPosy + (mng_int32)pImage->pImgbuf->iHeight >= pData->iDestt)    )) &&
              ((!pImage->bClipped) ||
               ((pImage->iClipl <= pImage->iClipr) && (pImage->iClipt <= pImage->iClipb)     &&
                (pImage->iClipl < pData->iDestr)   && (pImage->iClipr >= pData->iDestl)      &&
                (pImage->iClipt < pData->iDestb)   && (pImage->iClipb >= pData->iDestt)         )))
          {                            /* right; we've got ourselves something to do */
            if (pImage->bClipped)      /* clip output region with image's clipping region ? */
            {
              if (pImage->iClipl > pData->iDestl)
                pData->iDestl = pImage->iClipl;
              if (pImage->iClipr < pData->iDestr)
                pData->iDestr = pImage->iClipr;
              if (pImage->iClipt > pData->iDestt)
                pData->iDestt = pImage->iClipt;
              if (pImage->iClipb < pData->iDestb)
                pData->iDestb = pImage->iClipb;
            }
                                       /* image offset does some extra clipping too ! */
            if (pImage->iPosx > pData->iDestl)
              pData->iDestl = pImage->iPosx;
            if (pImage->iPosy > pData->iDestt)
              pData->iDestt = pImage->iPosy;

            if (!pData->iBACKtile)     /* without tiling further clipping is needed */
            {
              if (pImage->iPosx + (mng_int32)pImage->pImgbuf->iWidth  < pData->iDestr)
                pData->iDestr = pImage->iPosx + (mng_int32)pImage->pImgbuf->iWidth;
              if (pImage->iPosy + (mng_int32)pImage->pImgbuf->iHeight < pData->iDestb)
                pData->iDestb = pImage->iPosy + (mng_int32)pImage->pImgbuf->iHeight;
            }
            
            pData->iSourcel    = 0;    /* source relative to destination */
            pData->iSourcer    = pData->iDestr - pData->iDestl;
            pData->iSourcet    = 0;
            pData->iSourceb    = pData->iDestb - pData->iDestt;
                                       /* 16-bit background ? */

#ifdef MNG_NO_16BIT_SUPPORT
            pData->bIsRGBA16   = MNG_FALSE;
#else
            pData->bIsRGBA16      = (mng_bool)(pImage->pImgbuf->iBitdepth > 8);
#endif
                                       /* let restore routine know the offsets !!! */
            pData->iBackimgoffsx  = pImage->iPosx;
            pData->iBackimgoffsy  = pImage->iPosy;
            pData->iBackimgwidth  = pImage->pImgbuf->iWidth;
            pData->iBackimgheight = pImage->pImgbuf->iHeight;
            pData->iRow           = 0; /* start at the top again !! */
                                       /* determine background object 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_retrieve_rgba8;

                          pData->bIsOpaque      = MNG_FALSE;
                          break;
                        }

              case  8 : {
#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_TRUE;