/*

* 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:

*/