/*

* 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.

*

* Strip-organized Image Support Routines.

*/

#include "tiffiop.h"

/*

* Compute which strip a (row,sample) value is in.

*/

uint32

TIFFComputeStrip(TIFF* tif, uint32 row, uint16 sample)

{

static const char module[] = "TIFFComputeStrip";

TIFFDirectory *td = &tif->tif_dir;

uint32 strip;

strip = row / td->td_rowsperstrip;

if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {

if (sample >= td->td_samplesperpixel) {

TIFFErrorExt(tif->tif_clientdata, module,

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

(unsigned long) sample, (unsigned long) td->td_samplesperpixel);

return (0);

}

strip += (uint32)sample*td->td_stripsperimage;

}

return (strip);

}

/*

* Compute how many strips are in an image.

*/

uint32

TIFFNumberOfStrips(TIFF* tif)

{

TIFFDirectory *td = &tif->tif_dir;

uint32 nstrips;

nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 :

TIFFhowmany_32(td->td_imagelength, td->td_rowsperstrip));

if (td->td_planarconfig == PLANARCONFIG_SEPARATE)

nstrips = _TIFFMultiply32(tif, nstrips, (uint32)td->td_samplesperpixel,

"TIFFNumberOfStrips");

return (nstrips);

}

/*

* Compute the # bytes in a variable height, row-aligned strip.

*/

uint64

TIFFVStripSize64(TIFF* tif, uint32 nrows)

{

static const char module[] = "TIFFVStripSize64";

TIFFDirectory *td = &tif->tif_dir;

if (nrows==(uint32)(-1))

nrows=td->td_imagelength;

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

(td->td_photometric == PHOTOMETRIC_YCBCR)&&

(!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;

if(td->td_samplesperpixel!=3)

{

TIFFErrorExt(tif->tif_clientdata,module,

"Invalid td_samplesperpixel value");

return 0;

}

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_imagewidth,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,TIFFScanlineSize64(tif),module));

}

tmsize_t

TIFFVStripSize(TIFF* tif, uint32 nrows)

{

static const char module[] = "TIFFVStripSize";

uint64 m;

m=TIFFVStripSize64(tif,nrows);

return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

* Compute the # bytes in a raw strip.

*/

uint64

TIFFRawStripSize64(TIFF* tif, uint32 strip)

{

static const char module[] = "TIFFRawStripSize64";

uint64 bytecount = TIFFGetStrileByteCount(tif, strip);

if (bytecount == 0)

{

#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))

TIFFErrorExt(tif->tif_clientdata, module,

"%I64u: Invalid strip byte count, strip %lu",

(unsigned __int64) bytecount,

(unsigned long) strip);

#else

TIFFErrorExt(tif->tif_clientdata, module,

"%llu: Invalid strip byte count, strip %lu",

(unsigned long long) bytecount,

(unsigned long) strip);

#endif

bytecount = (uint64) -1;

}

return bytecount;

}

tmsize_t

TIFFRawStripSize(TIFF* tif, uint32 strip)

{

static const char module[] = "TIFFRawStripSize";

uint64 m;

tmsize_t n;

m=TIFFRawStripSize64(tif,strip);

if (m==(uint64)(-1))

n=(tmsize_t)(-1);

else

{

n=(tmsize_t)m;

if ((uint64)n!=m)

{

TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");

n=0;

}

}

return(n);

}

/*

* Compute the # bytes in a (row-aligned) strip.

*

* Note that if RowsPerStrip is larger than the

* recorded ImageLength, then the strip size is

* truncated to reflect the actual space required

* to hold the strip.

*/

uint64

TIFFStripSize64(TIFF* tif)

{

TIFFDirectory* td = &tif->tif_dir;

uint32 rps = td->td_rowsperstrip;

if (rps > td->td_imagelength)

rps = td->td_imagelength;

return (TIFFVStripSize64(tif, rps));

}

tmsize_t

TIFFStripSize(TIFF* tif)

{

static const char module[] = "TIFFStripSize";

uint64 m;

m=TIFFStripSize64(tif);

return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

* Compute a default strip size based on the image

* characteristics and a requested value. If the

* request is <1 then we choose a strip size according

* to certain heuristics.

*/

uint32

TIFFDefaultStripSize(TIFF* tif, uint32 request)

{

return (*tif->tif_defstripsize)(tif, request);

}

uint32

_TIFFDefaultStripSize(TIFF* tif, uint32 s)

{

if ((int32) s < 1) {

/*

* If RowsPerStrip is unspecified, try to break the

* image up into strips that are approximately

* STRIP_SIZE_DEFAULT bytes long.

*/

uint64 scanlinesize;

uint64 rows;

scanlinesize=TIFFScanlineSize64(tif);

if (scanlinesize==0)

scanlinesize=1;

rows=(uint64)STRIP_SIZE_DEFAULT/scanlinesize;

if (rows==0)

rows=1;

else if (rows>0xFFFFFFFF)

rows=0xFFFFFFFF;

s=(uint32)rows;

}

return (s);

}

/*

* Return the number of bytes to read/write in a call to

* one of the scanline-oriented i/o routines. Note that

* this number may be 1/samples-per-pixel if data is

* stored as separate planes.

* The ScanlineSize in case of YCbCrSubsampling is defined as the

* strip size divided by the strip height, i.e. the size of a pack of vertical

* subsampling lines divided by vertical subsampling. It should thus make

* sense when multiplied by a multiple of vertical subsampling.

*/

uint64

TIFFScanlineSize64(TIFF* tif)

{

static const char module[] = "TIFFScanlineSize64";

TIFFDirectory *td = &tif->tif_dir;

uint64 scanline_size;

if (td->td_planarconfig==PLANARCONFIG_CONTIG)

{

if ((td->td_photometric==PHOTOMETRIC_YCBCR)&&

(td->td_samplesperpixel==3)&&

(!isUpSampled(tif)))

{

uint16 ycbcrsubsampling[2];

uint16 samplingblock_samples;

uint32 samplingblocks_hor;

uint64 samplingrow_samples;

uint64 samplingrow_size;

if(td->td_samplesperpixel!=3)

{

TIFFErrorExt(tif->tif_clientdata,module,

"Invalid td_samplesperpixel value");

return 0;

}

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");

return 0;

}

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

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

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

samplingrow_size = TIFFhowmany_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module),8);

scanline_size = (samplingrow_size/ycbcrsubsampling[1]);

}

else

{

uint64 scanline_samples;

scanline_samples=_TIFFMultiply64(tif,td->td_imagewidth,td->td_samplesperpixel,module);

scanline_size=TIFFhowmany_64(_TIFFMultiply64(tif,scanline_samples,td->td_bitspersample,module),8);

}

}

else

{

scanline_size=TIFFhowmany_64(_TIFFMultiply64(tif,td->td_imagewidth,td->td_bitspersample,module),8);

}

if (scanline_size == 0)

{

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

return 0;

}

return(scanline_size);

}

tmsize_t

TIFFScanlineSize(TIFF* tif)

{

static const char module[] = "TIFFScanlineSize";

uint64 m;

m=TIFFScanlineSize64(tif);

return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

* Return the number of bytes required to store a complete

* decoded and packed raster scanline (as opposed to the

* I/O size returned by TIFFScanlineSize which may be less

* if data is store as separate planes).

*/

uint64

TIFFRasterScanlineSize64(TIFF* tif)

{

static const char module[] = "TIFFRasterScanlineSize64";

TIFFDirectory *td = &tif->tif_dir;

uint64 scanline;

scanline = _TIFFMultiply64(tif, td->td_bitspersample, td->td_imagewidth, module);

if (td->td_planarconfig == PLANARCONFIG_CONTIG) {

scanline = _TIFFMultiply64(tif, scanline, td->td_samplesperpixel, module);

return (TIFFhowmany8_64(scanline));

} else

return (_TIFFMultiply64(tif, TIFFhowmany8_64(scanline),

td->td_samplesperpixel, module));

}

tmsize_t

TIFFRasterScanlineSize(TIFF* tif)

{

static const char module[] = "TIFFRasterScanlineSize";

uint64 m;

m=TIFFRasterScanlineSize64(tif);

return _TIFFCastUInt64ToSSize(tif, m, module);

}

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

/*

* Local Variables:

* mode: c

* c-basic-offset: 8

* fill-column: 78

* End:

*/