/*

 * Copyright (c) 1991-1997 Sam Leffler

 * Copyright (c) 1991-1997 Silicon Graphics, Inc.

 *

 * Permission to use, copy, modify, distribute, and sell this software and 

 * its documentation for any purpose is hereby granted without fee, provided

 * that (i) the above copyright notices and this permission notice appear in

 * all copies of the software and related documentation, and (ii) the names of

 * Sam Leffler and Silicon Graphics may not be used in any advertising or

 * publicity relating to the software without the specific, prior written

 * permission of Sam Leffler and Silicon Graphics.

 * 

 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 

 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 

 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

 * 

 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,

 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 

 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 

 * OF THIS SOFTWARE.

 */

/*

 * TIFF Library.

 *

 * Tiled Image Support Routines.

 */

#include "tiffiop.h"

/*

 * Compute which tile an (x,y,z,s) value is in.

 */

uint32

TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, uint16 s)

{

  TIFFDirectory *td = &tif->tif_dir;

  uint32 dx = td->td_tilewidth;

  uint32 dy = td->td_tilelength;

  uint32 dz = td->td_tiledepth;

  uint32 tile = 1;

  if (td->td_imagedepth == 1)

    z = 0;

  if (dx == (uint32) -1)

    dx = td->td_imagewidth;

  if (dy == (uint32) -1)

    dy = td->td_imagelength;

  if (dz == (uint32) -1)

    dz = td->td_imagedepth;

  if (dx != 0 && dy != 0 && dz != 0) {

    uint32 xpt = TIFFhowmany_32(td->td_imagewidth, dx);

    uint32 ypt = TIFFhowmany_32(td->td_imagelength, dy);

    uint32 zpt = TIFFhowmany_32(td->td_imagedepth, dz);

    if (td->td_planarconfig == PLANARCONFIG_SEPARATE) 

      tile = (xpt*ypt*zpt)*s +

           (xpt*ypt)*(z/dz) +

           xpt*(y/dy) +

           x/dx;

    else

      tile = (xpt*ypt)*(z/dz) + xpt*(y/dy) + x/dx;

  }

  return (tile);

}

/*

 * Check an (x,y,z,s) coordinate

 * against the image bounds.

 */

int

TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, uint16 s)

{

  TIFFDirectory *td = &tif->tif_dir;

  if (x >= td->td_imagewidth) {

    TIFFErrorExt(tif->tif_clientdata, tif->tif_name,

           "%lu: Col out of range, max %lu",

           (unsigned long) x,

           (unsigned long) (td->td_imagewidth - 1));

    return (0);

  }

  if (y >= td->td_imagelength) {

    TIFFErrorExt(tif->tif_clientdata, tif->tif_name,

           "%lu: Row out of range, max %lu",

           (unsigned long) y,

           (unsigned long) (td->td_imagelength - 1));

    return (0);

  }

  if (z >= td->td_imagedepth) {

    TIFFErrorExt(tif->tif_clientdata, tif->tif_name,

           "%lu: Depth out of range, max %lu",

           (unsigned long) z,

           (unsigned long) (td->td_imagedepth - 1));

    return (0);

  }

  if (td->td_planarconfig == PLANARCONFIG_SEPARATE &&

      s >= td->td_samplesperpixel) {

    TIFFErrorExt(tif->tif_clientdata, tif->tif_name,

           "%lu: Sample out of range, max %lu",

           (unsigned long) s,

           (unsigned long) (td->td_samplesperpixel - 1));

    return (0);

  }

  return (1);

}

/*

 * Compute how many tiles are in an image.

 */

uint32

TIFFNumberOfTiles(TIFF* tif)

{

  TIFFDirectory *td = &tif->tif_dir;

  uint32 dx = td->td_tilewidth;

  uint32 dy = td->td_tilelength;

  uint32 dz = td->td_tiledepth;

  uint32 ntiles;

  if (dx == (uint32) -1)

    dx = td->td_imagewidth;

  if (dy == (uint32) -1)

    dy = td->td_imagelength;

  if (dz == (uint32) -1)

    dz = td->td_imagedepth;

  ntiles = (dx == 0 || dy == 0 || dz == 0) ? 0 :

      _TIFFMultiply32(tif, _TIFFMultiply32(tif, TIFFhowmany_32(td->td_imagewidth, dx),

      TIFFhowmany_32(td->td_imagelength, dy),

      "TIFFNumberOfTiles"),

      TIFFhowmany_32(td->td_imagedepth, dz), "TIFFNumberOfTiles");

  if (td->td_planarconfig == PLANARCONFIG_SEPARATE)

    ntiles = _TIFFMultiply32(tif, ntiles, td->td_samplesperpixel,

        "TIFFNumberOfTiles");

  return (ntiles);

}

/*

 * Compute the # bytes in each row of a tile.

 */

uint64

TIFFTileRowSize64(TIFF* tif)

{

        static const char module[] = "TIFFTileRowSize64";

  TIFFDirectory *td = &tif->tif_dir;

  uint64 rowsize;

  uint64 tilerowsize;

  if (td->td_tilelength == 0)

        {

                TIFFErrorExt(tif->tif_clientdata,module,"Tile length is zero");

                return 0;

        }

        if (td->td_tilewidth == 0)

        {

                TIFFErrorExt(tif->tif_clientdata,module,"Tile width is zero");

    return (0);

        }

  rowsize = _TIFFMultiply64(tif, td->td_bitspersample, td->td_tilewidth,

      "TIFFTileRowSize");

  if (td->td_planarconfig == PLANARCONFIG_CONTIG)

        {

                if (td->td_samplesperpixel == 0)

                {

                        TIFFErrorExt(tif->tif_clientdata,module,"Samples per pixel is zero");

                        return 0;

                }

    rowsize = _TIFFMultiply64(tif, rowsize, td->td_samplesperpixel,

        "TIFFTileRowSize");

        }

        tilerowsize=TIFFhowmany8_64(rowsize);

        if (tilerowsize == 0)

        {

                TIFFErrorExt(tif->tif_clientdata,module,"Computed tile row size is zero");

                return 0;

        }

  return (tilerowsize);

}

tmsize_t

TIFFTileRowSize(TIFF* tif)

{

  static const char module[] = "TIFFTileRowSize";

  uint64 m;

  m=TIFFTileRowSize64(tif);

  return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

 * Compute the # bytes in a variable length, row-aligned tile.

 */

uint64

TIFFVTileSize64(TIFF* tif, uint32 nrows)

{

  static const char module[] = "TIFFVTileSize64";

  TIFFDirectory *td = &tif->tif_dir;

  if (td->td_tilelength == 0 || td->td_tilewidth == 0 ||

      td->td_tiledepth == 0)

    return (0);

  if ((td->td_planarconfig==PLANARCONFIG_CONTIG)&&

      (td->td_photometric==PHOTOMETRIC_YCBCR)&&

      (td->td_samplesperpixel==3)&&

      (!isUpSampled(tif)))

  {

    /*

     * Packed YCbCr data contain one Cb+Cr for every

     * HorizontalSampling*VerticalSampling Y values.

     * Must also roundup width and height when calculating

     * since images that are not a multiple of the

     * horizontal/vertical subsampling area include

     * YCbCr data for the extended image.

     */

    uint16 ycbcrsubsampling[2];

    uint16 samplingblock_samples;

    uint32 samplingblocks_hor;

    uint32 samplingblocks_ver;

    uint64 samplingrow_samples;

    uint64 samplingrow_size;

    TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,ycbcrsubsampling+0,

        ycbcrsubsampling+1);

    if ((ycbcrsubsampling[0] != 1 && ycbcrsubsampling[0] != 2 && ycbcrsubsampling[0] != 4)

        ||(ycbcrsubsampling[1] != 1 && ycbcrsubsampling[1] != 2 && ycbcrsubsampling[1] != 4))

    {

      TIFFErrorExt(tif->tif_clientdata,module,

             "Invalid YCbCr subsampling (%dx%d)", 

             ycbcrsubsampling[0], 

             ycbcrsubsampling[1] );

      return 0;

    }

    samplingblock_samples=ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;

    samplingblocks_hor=TIFFhowmany_32(td->td_tilewidth,ycbcrsubsampling[0]);

    samplingblocks_ver=TIFFhowmany_32(nrows,ycbcrsubsampling[1]);

    samplingrow_samples=_TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);

    samplingrow_size=TIFFhowmany8_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module));

    return(_TIFFMultiply64(tif,samplingrow_size,samplingblocks_ver,module));

  }

  else

    return(_TIFFMultiply64(tif,nrows,TIFFTileRowSize64(tif),module));

}

tmsize_t

TIFFVTileSize(TIFF* tif, uint32 nrows)

{

  static const char module[] = "TIFFVTileSize";

  uint64 m;

  m=TIFFVTileSize64(tif,nrows);

  return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

 * Compute the # bytes in a row-aligned tile.

 */

uint64

TIFFTileSize64(TIFF* tif)

{

  return (TIFFVTileSize64(tif, tif->tif_dir.td_tilelength));

}

tmsize_t

TIFFTileSize(TIFF* tif)

{

  static const char module[] = "TIFFTileSize";

  uint64 m;

  m=TIFFTileSize64(tif);

  return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

 * Compute a default tile size based on the image

 * characteristics and a requested value.  If a

 * request is <1 then we choose a size according

 * to certain heuristics.

 */

void

TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)

{

  (*tif->tif_deftilesize)(tif, tw, th);

}

void

_TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)

{

  (void) tif;

  if (*(int32*) tw < 1)

    *tw = 256;

  if (*(int32*) th < 1)

    *th = 256;

  /* roundup to a multiple of 16 per the spec */

  if (*tw & 0xf)

    *tw = TIFFroundup_32(*tw, 16);

  if (*th & 0xf)

    *th = TIFFroundup_32(*th, 16);

}

/* vim: set ts=8 sts=8 sw=8 noet: */

/*

 * Local Variables:

 * mode: c

 * c-basic-offset: 8

 * fill-column: 78

 * End:

 */