/* $Id: tif_strip.c,v 1.35 2012-06-06 05:33:55 fwarmerdam Exp $ */

/*

 * 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:

 */