[wxWidgets.git] / src / tiff / libtiff / tif_tile.c


/*
 * 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)
{
	TIFFDirectory *td = &tif->tif_dir;
	uint64 rowsize;

	if (td->td_tilelength == 0 || td->td_tilewidth == 0)
		return (0);
	rowsize = _TIFFMultiply64(tif, td->td_bitspersample, td->td_tilewidth,
	    "TIFFTileRowSize");
	if (td->td_planarconfig == PLANARCONFIG_CONTIG)
		rowsize = _TIFFMultiply64(tif, rowsize, td->td_samplesperpixel,
		    "TIFFTileRowSize");
	return (TIFFhowmany8_64(rowsize));
}
tmsize_t
TIFFTileRowSize(TIFF* tif)
{
	static const char module[] = "TIFFTileRowSize";
	uint64 m;
	tmsize_t n;
	m=TIFFTileRowSize64(tif);
	n=(tmsize_t)m;
	if ((uint64)n!=m)
	{
		TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
		n=0;
	}
	return(n);
}

/*
 * 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;
	tmsize_t n;
	m=TIFFVTileSize64(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 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;
	tmsize_t n;
	m=TIFFTileSize64(tif);
	n=(tmsize_t)m;
	if ((uint64)n!=m)
	{
		TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
		n=0;
	}
	return(n);
}

/*
 * 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:
 */
Commit	Line	Data
8414a40c VZ	1
	2	/*
	3	* Copyright (c) 1991-1997 Sam Leffler
	4	* Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	*
	6	* Permission to use, copy, modify, distribute, and sell this software and
	7	* its documentation for any purpose is hereby granted without fee, provided
	8	* that (i) the above copyright notices and this permission notice appear in
	9	* all copies of the software and related documentation, and (ii) the names of
	10	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	* publicity relating to the software without the specific, prior written
	12	* permission of Sam Leffler and Silicon Graphics.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	*
	18	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	* OF THIS SOFTWARE.
	24	*/
	25
	26	/*
	27	* TIFF Library.
	28	*
	29	* Tiled Image Support Routines.
	30	*/
	31	#include "tiffiop.h"
	32
8414a40c VZ	33	/*
	34	* Compute which tile an (x,y,z,s) value is in.
	35	*/
80ed523f VZ	36	uint32
80ed523f VZ	37	TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, uint16 s)
8414a40c VZ	38	{
	39	TIFFDirectory *td = &tif->tif_dir;
	40	uint32 dx = td->td_tilewidth;
	41	uint32 dy = td->td_tilelength;
	42	uint32 dz = td->td_tiledepth;
80ed523f	43	uint32 tile = 1;
8414a40c VZ	44
	45	if (td->td_imagedepth == 1)
	46	z = 0;
	47	if (dx == (uint32) -1)
	48	dx = td->td_imagewidth;
	49	if (dy == (uint32) -1)
	50	dy = td->td_imagelength;
	51	if (dz == (uint32) -1)
	52	dz = td->td_imagedepth;
	53	if (dx != 0 && dy != 0 && dz != 0) {
80ed523f VZ	54	uint32 xpt = TIFFhowmany_32(td->td_imagewidth, dx);
	55	uint32 ypt = TIFFhowmany_32(td->td_imagelength, dy);
	56	uint32 zpt = TIFFhowmany_32(td->td_imagedepth, dz);
8414a40c VZ	57
	58	if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
	59	tile = (xptyptzpt)*s +
	60	(xptypt)(z/dz) +
	61	xpt*(y/dy) +
	62	x/dx;
	63	else
	64	tile = (xptypt)(z/dz) + xpt*(y/dy) + x/dx;
	65	}
	66	return (tile);
	67	}
	68
	69	/*
	70	* Check an (x,y,z,s) coordinate
	71	* against the image bounds.
	72	*/
	73	int
80ed523f	74	TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, uint16 s)
8414a40c VZ	75	{
	76	TIFFDirectory *td = &tif->tif_dir;
	77
	78	if (x >= td->td_imagewidth) {
	79	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
	80	"%lu: Col out of range, max %lu",
	81	(unsigned long) x,
	82	(unsigned long) (td->td_imagewidth - 1));
	83	return (0);
	84	}
	85	if (y >= td->td_imagelength) {
	86	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
	87	"%lu: Row out of range, max %lu",
	88	(unsigned long) y,
	89	(unsigned long) (td->td_imagelength - 1));
	90	return (0);
	91	}
	92	if (z >= td->td_imagedepth) {
	93	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
	94	"%lu: Depth out of range, max %lu",
	95	(unsigned long) z,
	96	(unsigned long) (td->td_imagedepth - 1));
	97	return (0);
	98	}
	99	if (td->td_planarconfig == PLANARCONFIG_SEPARATE &&
	100	s >= td->td_samplesperpixel) {
	101	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
	102	"%lu: Sample out of range, max %lu",
	103	(unsigned long) s,
	104	(unsigned long) (td->td_samplesperpixel - 1));
	105	return (0);
	106	}
	107	return (1);
	108	}
	109
	110	/*
	111	* Compute how many tiles are in an image.
	112	*/
80ed523f	113	uint32
8414a40c VZ	114	TIFFNumberOfTiles(TIFF* tif)
	115	{
	116	TIFFDirectory *td = &tif->tif_dir;
	117	uint32 dx = td->td_tilewidth;
	118	uint32 dy = td->td_tilelength;
	119	uint32 dz = td->td_tiledepth;
80ed523f	120	uint32 ntiles;
8414a40c VZ	121
	122	if (dx == (uint32) -1)
	123	dx = td->td_imagewidth;
	124	if (dy == (uint32) -1)
	125	dy = td->td_imagelength;
	126	if (dz == (uint32) -1)
	127	dz = td->td_imagedepth;
	128	ntiles = (dx == 0 \|\| dy == 0 \|\| dz == 0) ? 0 :
80ed523f VZ	129	_TIFFMultiply32(tif, _TIFFMultiply32(tif, TIFFhowmany_32(td->td_imagewidth, dx),
	130	TIFFhowmany_32(td->td_imagelength, dy),
	131	"TIFFNumberOfTiles"),
	132	TIFFhowmany_32(td->td_imagedepth, dz), "TIFFNumberOfTiles");
8414a40c	133	if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
80ed523f VZ	134	ntiles = _TIFFMultiply32(tif, ntiles, td->td_samplesperpixel,
80ed523f VZ	135	"TIFFNumberOfTiles");
8414a40c VZ	136	return (ntiles);
	137	}
	138
	139	/*
	140	* Compute the # bytes in each row of a tile.
	141	*/
80ed523f VZ	142	uint64
80ed523f VZ	143	TIFFTileRowSize64(TIFF* tif)
8414a40c VZ	144	{
8414a40c VZ	145	TIFFDirectory *td = &tif->tif_dir;
80ed523f VZ	146	uint64 rowsize;
80ed523f VZ	147
8414a40c	148	if (td->td_tilelength == 0 \|\| td->td_tilewidth == 0)
80ed523f VZ	149	return (0);
	150	rowsize = _TIFFMultiply64(tif, td->td_bitspersample, td->td_tilewidth,
	151	"TIFFTileRowSize");
8414a40c	152	if (td->td_planarconfig == PLANARCONFIG_CONTIG)
80ed523f VZ	153	rowsize = _TIFFMultiply64(tif, rowsize, td->td_samplesperpixel,
	154	"TIFFTileRowSize");
	155	return (TIFFhowmany8_64(rowsize));
	156	}
	157	tmsize_t
	158	TIFFTileRowSize(TIFF* tif)
	159	{
	160	static const char module[] = "TIFFTileRowSize";
	161	uint64 m;
	162	tmsize_t n;
	163	m=TIFFTileRowSize64(tif);
	164	n=(tmsize_t)m;
	165	if ((uint64)n!=m)
	166	{
	167	TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
	168	n=0;
	169	}
	170	return(n);
8414a40c VZ	171	}
	172
	173	/*
	174	* Compute the # bytes in a variable length, row-aligned tile.
	175	*/
80ed523f VZ	176	uint64
80ed523f VZ	177	TIFFVTileSize64(TIFF* tif, uint32 nrows)
8414a40c	178	{
80ed523f	179	static const char module[] = "TIFFVTileSize64";
8414a40c	180	TIFFDirectory *td = &tif->tif_dir;
8414a40c VZ	181	if (td->td_tilelength == 0 \|\| td->td_tilewidth == 0 \|\|
8414a40c VZ	182	td->td_tiledepth == 0)
80ed523f VZ	183	return (0);
	184	if ((td->td_planarconfig==PLANARCONFIG_CONTIG)&&
	185	(td->td_photometric==PHOTOMETRIC_YCBCR)&&
	186	(td->td_samplesperpixel==3)&&
	187	(!isUpSampled(tif)))
	188	{
8414a40c VZ	189	/*
	190	* Packed YCbCr data contain one Cb+Cr for every
	191	* HorizontalSampling*VerticalSampling Y values.
	192	* Must also roundup width and height when calculating
	193	* since images that are not a multiple of the
	194	* horizontal/vertical subsampling area include
	195	* YCbCr data for the extended image.
	196	*/
80ed523f VZ	197	uint16 ycbcrsubsampling[2];
	198	uint16 samplingblock_samples;
	199	uint32 samplingblocks_hor;
	200	uint32 samplingblocks_ver;
	201	uint64 samplingrow_samples;
	202	uint64 samplingrow_size;
	203	TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,ycbcrsubsampling+0,
	204	ycbcrsubsampling+1);
	205	if ((ycbcrsubsampling[0] != 1 && ycbcrsubsampling[0] != 2 && ycbcrsubsampling[0] != 4)
	206	\|\|(ycbcrsubsampling[1] != 1 && ycbcrsubsampling[1] != 2 && ycbcrsubsampling[1] != 4))
	207	{
	208	TIFFErrorExt(tif->tif_clientdata,module,
	209	"Invalid YCbCr subsampling (%dx%d)",
	210	ycbcrsubsampling[0],
	211	ycbcrsubsampling[1] );
8414a40c VZ	212	return 0;
8414a40c VZ	213	}
80ed523f VZ	214	samplingblock_samples=ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;
	215	samplingblocks_hor=TIFFhowmany_32(td->td_tilewidth,ycbcrsubsampling[0]);
	216	samplingblocks_ver=TIFFhowmany_32(nrows,ycbcrsubsampling[1]);
	217	samplingrow_samples=_TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);
	218	samplingrow_size=TIFFhowmany8_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module));
	219	return(_TIFFMultiply64(tif,samplingrow_size,samplingblocks_ver,module));
	220	}
	221	else
	222	return(_TIFFMultiply64(tif,nrows,TIFFTileRowSize64(tif),module));
	223	}
	224	tmsize_t
	225	TIFFVTileSize(TIFF* tif, uint32 nrows)
	226	{
	227	static const char module[] = "TIFFVTileSize";
	228	uint64 m;
	229	tmsize_t n;
	230	m=TIFFVTileSize64(tif,nrows);
	231	n=(tmsize_t)m;
	232	if ((uint64)n!=m)
	233	{
	234	TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
	235	n=0;
	236	}
	237	return(n);
8414a40c VZ	238	}
	239
	240	/*
	241	* Compute the # bytes in a row-aligned tile.
	242	*/
80ed523f VZ	243	uint64
	244	TIFFTileSize64(TIFF* tif)
	245	{
	246	return (TIFFVTileSize64(tif, tif->tif_dir.td_tilelength));
	247	}
	248	tmsize_t
8414a40c VZ	249	TIFFTileSize(TIFF* tif)
8414a40c VZ	250	{
80ed523f VZ	251	static const char module[] = "TIFFTileSize";
	252	uint64 m;
	253	tmsize_t n;
	254	m=TIFFTileSize64(tif);
	255	n=(tmsize_t)m;
	256	if ((uint64)n!=m)
	257	{
	258	TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
	259	n=0;
	260	}
	261	return(n);
8414a40c VZ	262	}
	263
	264	/*
	265	* Compute a default tile size based on the image
	266	* characteristics and a requested value. If a
	267	* request is <1 then we choose a size according
	268	* to certain heuristics.
	269	*/
	270	void
	271	TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
	272	{
	273	(*tif->tif_deftilesize)(tif, tw, th);
	274	}
	275
	276	void
	277	_TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
	278	{
	279	(void) tif;
	280	if ((int32) tw < 1)
	281	*tw = 256;
	282	if ((int32) th < 1)
	283	*th = 256;
	284	/* roundup to a multiple of 16 per the spec */
	285	if (*tw & 0xf)
80ed523f	286	tw = TIFFroundup_32(tw, 16);
8414a40c	287	if (*th & 0xf)
80ed523f	288	th = TIFFroundup_32(th, 16);
8414a40c VZ	289	}
	290
	291	/* vim: set ts=8 sts=8 sw=8 noet: */
80ed523f VZ	292	/*
	293	* Local Variables:
	294	* mode: c
	295	* c-basic-offset: 8
	296	* fill-column: 78
	297	* End:
	298	*/