src/tiff/libtiff/tif_strip.c

/* $Id$ */

/*
 * 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;
	tmsize_t n;
	m=TIFFVStripSize64(tif,nrows);
	n=(tmsize_t)m;
	if ((uint64)n!=m)
	{
		TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
		n=0;
	}
	return(n);
}

/*
 * Compute the # bytes in a raw strip.
 */
uint64
TIFFRawStripSize64(TIFF* tif, uint32 strip)
{
	static const char module[] = "TIFFRawStripSize64";
	TIFFDirectory* td = &tif->tif_dir;
	uint64 bytecount = td->td_stripbytecount[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;
	tmsize_t n;
	m=TIFFStripSize64(tif);
	n=(tmsize_t)m;
	if ((uint64)n!=m)
	{
		TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
		n=0;
	}
	return(n);
}

/*
 * 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);
	return(scanline_size);
}
tmsize_t
TIFFScanlineSize(TIFF* tif)
{
	static const char module[] = "TIFFScanlineSize";
	uint64 m;
	tmsize_t n;
	m=TIFFScanlineSize64(tif);
	n=(tmsize_t)m;
	if ((uint64)n!=m)
	{
		TIFFErrorExt(tif->tif_clientdata,module,"Integer arithmetic overflow");
		n=0;
	}
	return(n);
}

/*
 * 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;
	tmsize_t n;
	m=TIFFRasterScanlineSize64(tif);
	n=(tmsize_t)m;
	if ((uint64)n!=m)
	{
		TIFFErrorExt(tif->tif_clientdata,module,"Integer arithmetic overflow");
		n=0;
	}
	return(n);
}

/* vim: set ts=8 sts=8 sw=8 noet: */
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 8
 * fill-column: 78
 * End:
 */
Commit	Line	Data
	1	/* $Id$ */
	2
	3	/*
	4	* Copyright (c) 1991-1997 Sam Leffler
	5	* Copyright (c) 1991-1997 Silicon Graphics, Inc.
	6	*
	7	* Permission to use, copy, modify, distribute, and sell this software and
	8	* its documentation for any purpose is hereby granted without fee, provided
	9	* that (i) the above copyright notices and this permission notice appear in
	10	* all copies of the software and related documentation, and (ii) the names of
	11	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	12	* publicity relating to the software without the specific, prior written
	13	* permission of Sam Leffler and Silicon Graphics.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	16	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	17	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	18	*
	19	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	20	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	21	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	22	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	23	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	24	* OF THIS SOFTWARE.
	25	*/
	26
	27	/*
	28	* TIFF Library.
	29	*
	30	* Strip-organized Image Support Routines.
	31	*/
	32	#include "tiffiop.h"
	33
	34	/*
	35	* Compute which strip a (row,sample) value is in.
	36	*/
	37	uint32
	38	TIFFComputeStrip(TIFF* tif, uint32 row, uint16 sample)
	39	{
	40	static const char module[] = "TIFFComputeStrip";
	41	TIFFDirectory *td = &tif->tif_dir;
	42	uint32 strip;
	43
	44	strip = row / td->td_rowsperstrip;
	45	if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
	46	if (sample >= td->td_samplesperpixel) {
	47	TIFFErrorExt(tif->tif_clientdata, module,
	48	"%lu: Sample out of range, max %lu",
	49	(unsigned long) sample, (unsigned long) td->td_samplesperpixel);
	50	return (0);
	51	}
	52	strip += (uint32)sample*td->td_stripsperimage;
	53	}
	54	return (strip);
	55	}
	56
	57	/*
	58	* Compute how many strips are in an image.
	59	*/
	60	uint32
	61	TIFFNumberOfStrips(TIFF* tif)
	62	{
	63	TIFFDirectory *td = &tif->tif_dir;
	64	uint32 nstrips;
	65
	66	nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 :
	67	TIFFhowmany_32(td->td_imagelength, td->td_rowsperstrip));
	68	if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
	69	nstrips = _TIFFMultiply32(tif, nstrips, (uint32)td->td_samplesperpixel,
	70	"TIFFNumberOfStrips");
	71	return (nstrips);
	72	}
	73
	74	/*
	75	* Compute the # bytes in a variable height, row-aligned strip.
	76	*/
	77	uint64
	78	TIFFVStripSize64(TIFF* tif, uint32 nrows)
	79	{
	80	static const char module[] = "TIFFVStripSize64";
	81	TIFFDirectory *td = &tif->tif_dir;
	82	if (nrows==(uint32)(-1))
	83	nrows=td->td_imagelength;
	84	if ((td->td_planarconfig==PLANARCONFIG_CONTIG)&&
	85	(td->td_photometric == PHOTOMETRIC_YCBCR)&&
	86	(!isUpSampled(tif)))
	87	{
	88	/*
	89	* Packed YCbCr data contain one Cb+Cr for every
	90	* HorizontalSampling*VerticalSampling Y values.
	91	* Must also roundup width and height when calculating
	92	* since images that are not a multiple of the
	93	* horizontal/vertical subsampling area include
	94	* YCbCr data for the extended image.
	95	*/
	96	uint16 ycbcrsubsampling[2];
	97	uint16 samplingblock_samples;
	98	uint32 samplingblocks_hor;
	99	uint32 samplingblocks_ver;
	100	uint64 samplingrow_samples;
	101	uint64 samplingrow_size;
	102	if(td->td_samplesperpixel!=3)
	103	{
	104	TIFFErrorExt(tif->tif_clientdata,module,
	105	"Invalid td_samplesperpixel value");
	106	return 0;
	107	}
	108	TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,ycbcrsubsampling+0,
	109	ycbcrsubsampling+1);
	110	if ((ycbcrsubsampling[0] != 1 && ycbcrsubsampling[0] != 2 && ycbcrsubsampling[0] != 4)
	111	\|\|(ycbcrsubsampling[1] != 1 && ycbcrsubsampling[1] != 2 && ycbcrsubsampling[1] != 4))
	112	{
	113	TIFFErrorExt(tif->tif_clientdata,module,
	114	"Invalid YCbCr subsampling (%dx%d)",
	115	ycbcrsubsampling[0],
	116	ycbcrsubsampling[1] );
	117	return 0;
	118	}
	119	samplingblock_samples=ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;
	120	samplingblocks_hor=TIFFhowmany_32(td->td_imagewidth,ycbcrsubsampling[0]);
	121	samplingblocks_ver=TIFFhowmany_32(nrows,ycbcrsubsampling[1]);
	122	samplingrow_samples=_TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);
	123	samplingrow_size=TIFFhowmany8_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module));
	124	return(_TIFFMultiply64(tif,samplingrow_size,samplingblocks_ver,module));
	125	}
	126	else
	127	return(_TIFFMultiply64(tif,nrows,TIFFScanlineSize64(tif),module));
	128	}
	129	tmsize_t
	130	TIFFVStripSize(TIFF* tif, uint32 nrows)
	131	{
	132	static const char module[] = "TIFFVStripSize";
	133	uint64 m;
	134	tmsize_t n;
	135	m=TIFFVStripSize64(tif,nrows);
	136	n=(tmsize_t)m;
	137	if ((uint64)n!=m)
	138	{
	139	TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
	140	n=0;
	141	}
	142	return(n);
	143	}
	144
	145	/*
	146	* Compute the # bytes in a raw strip.
	147	*/
	148	uint64
	149	TIFFRawStripSize64(TIFF* tif, uint32 strip)
	150	{
	151	static const char module[] = "TIFFRawStripSize64";
	152	TIFFDirectory* td = &tif->tif_dir;
	153	uint64 bytecount = td->td_stripbytecount[strip];
	154
	155	if (bytecount == 0)
	156	{
	157	#if defined(__WIN32__) && (defined(_MSC_VER) \|\| defined(__MINGW32__))
	158	TIFFErrorExt(tif->tif_clientdata, module,
	159	"%I64u: Invalid strip byte count, strip %lu",
	160	(unsigned __int64) bytecount,
	161	(unsigned long) strip);
	162	#else
	163	TIFFErrorExt(tif->tif_clientdata, module,
	164	"%llu: Invalid strip byte count, strip %lu",
	165	(unsigned long long) bytecount,
	166	(unsigned long) strip);
	167	#endif
	168	bytecount = (uint64) -1;
	169	}
	170
	171	return bytecount;
	172	}
	173	tmsize_t
	174	TIFFRawStripSize(TIFF* tif, uint32 strip)
	175	{
	176	static const char module[] = "TIFFRawStripSize";
	177	uint64 m;
	178	tmsize_t n;
	179	m=TIFFRawStripSize64(tif,strip);
	180	if (m==(uint64)(-1))
	181	n=(tmsize_t)(-1);
	182	else
	183	{
	184	n=(tmsize_t)m;
	185	if ((uint64)n!=m)
	186	{
	187	TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
	188	n=0;
	189	}
	190	}
	191	return(n);
	192	}
	193
	194	/*
	195	* Compute the # bytes in a (row-aligned) strip.
	196	*
	197	* Note that if RowsPerStrip is larger than the
	198	* recorded ImageLength, then the strip size is
	199	* truncated to reflect the actual space required
	200	* to hold the strip.
	201	*/
	202	uint64
	203	TIFFStripSize64(TIFF* tif)
	204	{
	205	TIFFDirectory* td = &tif->tif_dir;
	206	uint32 rps = td->td_rowsperstrip;
	207	if (rps > td->td_imagelength)
	208	rps = td->td_imagelength;
	209	return (TIFFVStripSize64(tif, rps));
	210	}
	211	tmsize_t
	212	TIFFStripSize(TIFF* tif)
	213	{
	214	static const char module[] = "TIFFStripSize";
	215	uint64 m;
	216	tmsize_t n;
	217	m=TIFFStripSize64(tif);
	218	n=(tmsize_t)m;
	219	if ((uint64)n!=m)
	220	{
	221	TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
	222	n=0;
	223	}
	224	return(n);
	225	}
	226
	227	/*
	228	* Compute a default strip size based on the image
	229	* characteristics and a requested value. If the
	230	* request is <1 then we choose a strip size according
	231	* to certain heuristics.
	232	*/
	233	uint32
	234	TIFFDefaultStripSize(TIFF* tif, uint32 request)
	235	{
	236	return (*tif->tif_defstripsize)(tif, request);
	237	}
	238
	239	uint32
	240	_TIFFDefaultStripSize(TIFF* tif, uint32 s)
	241	{
	242	if ((int32) s < 1) {
	243	/*
	244	* If RowsPerStrip is unspecified, try to break the
	245	* image up into strips that are approximately
	246	* STRIP_SIZE_DEFAULT bytes long.
	247	*/
	248	uint64 scanlinesize;
	249	uint64 rows;
	250	scanlinesize=TIFFScanlineSize64(tif);
	251	if (scanlinesize==0)
	252	scanlinesize=1;
	253	rows=(uint64)STRIP_SIZE_DEFAULT/scanlinesize;
	254	if (rows==0)
	255	rows=1;
	256	else if (rows>0xFFFFFFFF)
	257	rows=0xFFFFFFFF;
	258	s=(uint32)rows;
	259	}
	260	return (s);
	261	}
	262
	263	/*
	264	* Return the number of bytes to read/write in a call to
	265	* one of the scanline-oriented i/o routines. Note that
	266	* this number may be 1/samples-per-pixel if data is
	267	* stored as separate planes.
	268	* The ScanlineSize in case of YCbCrSubsampling is defined as the
	269	* strip size divided by the strip height, i.e. the size of a pack of vertical
	270	* subsampling lines divided by vertical subsampling. It should thus make
	271	* sense when multiplied by a multiple of vertical subsampling.
	272	*/
	273	uint64
	274	TIFFScanlineSize64(TIFF* tif)
	275	{
	276	static const char module[] = "TIFFScanlineSize64";
	277	TIFFDirectory *td = &tif->tif_dir;
	278	uint64 scanline_size;
	279	if (td->td_planarconfig==PLANARCONFIG_CONTIG)
	280	{
	281	if ((td->td_photometric==PHOTOMETRIC_YCBCR)&&
	282	(td->td_samplesperpixel==3)&&
	283	(!isUpSampled(tif)))
	284	{
	285	uint16 ycbcrsubsampling[2];
	286	uint16 samplingblock_samples;
	287	uint32 samplingblocks_hor;
	288	uint64 samplingrow_samples;
	289	uint64 samplingrow_size;
	290	if(td->td_samplesperpixel!=3)
	291	{
	292	TIFFErrorExt(tif->tif_clientdata,module,
	293	"Invalid td_samplesperpixel value");
	294	return 0;
	295	}
	296	TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,
	297	ycbcrsubsampling+0,
	298	ycbcrsubsampling+1);
	299	if (((ycbcrsubsampling[0]!=1)&&(ycbcrsubsampling[0]!=2)&&(ycbcrsubsampling[0]!=4)) \|\|
	300	((ycbcrsubsampling[1]!=1)&&(ycbcrsubsampling[1]!=2)&&(ycbcrsubsampling[1]!=4)))
	301	{
	302	TIFFErrorExt(tif->tif_clientdata,module,
	303	"Invalid YCbCr subsampling");
	304	return 0;
	305	}
	306	samplingblock_samples = ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;
	307	samplingblocks_hor = TIFFhowmany_32(td->td_imagewidth,ycbcrsubsampling[0]);
	308	samplingrow_samples = _TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);
	309	samplingrow_size = TIFFhowmany_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module),8);
	310	scanline_size = (samplingrow_size/ycbcrsubsampling[1]);
	311	}
	312	else
	313	{
	314	uint64 scanline_samples;
	315	scanline_samples=_TIFFMultiply64(tif,td->td_imagewidth,td->td_samplesperpixel,module);
	316	scanline_size=TIFFhowmany_64(_TIFFMultiply64(tif,scanline_samples,td->td_bitspersample,module),8);
	317	}
	318	}
	319	else
	320	scanline_size=TIFFhowmany_64(_TIFFMultiply64(tif,td->td_imagewidth,td->td_bitspersample,module),8);
	321	return(scanline_size);
	322	}
	323	tmsize_t
	324	TIFFScanlineSize(TIFF* tif)
	325	{
	326	static const char module[] = "TIFFScanlineSize";
	327	uint64 m;
	328	tmsize_t n;
	329	m=TIFFScanlineSize64(tif);
	330	n=(tmsize_t)m;
	331	if ((uint64)n!=m)
	332	{
	333	TIFFErrorExt(tif->tif_clientdata,module,"Integer arithmetic overflow");
	334	n=0;
	335	}
	336	return(n);
	337	}
	338
	339	/*
	340	* Return the number of bytes required to store a complete
	341	* decoded and packed raster scanline (as opposed to the
	342	* I/O size returned by TIFFScanlineSize which may be less
	343	* if data is store as separate planes).
	344	*/
	345	uint64
	346	TIFFRasterScanlineSize64(TIFF* tif)
	347	{
	348	static const char module[] = "TIFFRasterScanlineSize64";
	349	TIFFDirectory *td = &tif->tif_dir;
	350	uint64 scanline;
	351
	352	scanline = _TIFFMultiply64(tif, td->td_bitspersample, td->td_imagewidth, module);
	353	if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
	354	scanline = _TIFFMultiply64(tif, scanline, td->td_samplesperpixel, module);
	355	return (TIFFhowmany8_64(scanline));
	356	} else
	357	return (_TIFFMultiply64(tif, TIFFhowmany8_64(scanline),
	358	td->td_samplesperpixel, module));
	359	}
	360	tmsize_t
	361	TIFFRasterScanlineSize(TIFF* tif)
	362	{
	363	static const char module[] = "TIFFRasterScanlineSize";
	364	uint64 m;
	365	tmsize_t n;
	366	m=TIFFRasterScanlineSize64(tif);
	367	n=(tmsize_t)m;
	368	if ((uint64)n!=m)
	369	{
	370	TIFFErrorExt(tif->tif_clientdata,module,"Integer arithmetic overflow");
	371	n=0;
	372	}
	373	return(n);
	374	}
	375
	376	/* vim: set ts=8 sts=8 sw=8 noet: */
	377	/*
	378	* Local Variables:
	379	* mode: c
	380	* c-basic-offset: 8
	381	* fill-column: 78
	382	* End:
	383	*/