[wxWidgets.git] / src / tiff / libtiff / tif_aux.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.
 *
 * Auxiliary Support Routines.
 */
#include "tiffiop.h"
#include "tif_predict.h"
#include <math.h>

uint32
_TIFFMultiply32(TIFF* tif, uint32 first, uint32 second, const char* where)
{
	uint32 bytes = first * second;

	if (second && bytes / second != first) {
		TIFFErrorExt(tif->tif_clientdata, where, "Integer overflow in %s", where);
		bytes = 0;
	}

	return bytes;
}

uint64
_TIFFMultiply64(TIFF* tif, uint64 first, uint64 second, const char* where)
{
	uint64 bytes = first * second;

	if (second && bytes / second != first) {
		TIFFErrorExt(tif->tif_clientdata, where, "Integer overflow in %s", where);
		bytes = 0;
	}

	return bytes;
}

void*
_TIFFCheckRealloc(TIFF* tif, void* buffer,
		  tmsize_t nmemb, tmsize_t elem_size, const char* what)
{
	void* cp = NULL;
	tmsize_t bytes = nmemb * elem_size;

	/*
	 * XXX: Check for integer overflow.
	 */
	if (nmemb && elem_size && bytes / elem_size == nmemb)
		cp = _TIFFrealloc(buffer, bytes);

	if (cp == NULL) {
		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
			     "Failed to allocate memory for %s "
			     "(%ld elements of %ld bytes each)",
			     what,(long) nmemb, (long) elem_size);
	}

	return cp;
}

void*
_TIFFCheckMalloc(TIFF* tif, tmsize_t nmemb, tmsize_t elem_size, const char* what)
{
	return _TIFFCheckRealloc(tif, NULL, nmemb, elem_size, what);  
}

static int
TIFFDefaultTransferFunction(TIFFDirectory* td)
{
	uint16 **tf = td->td_transferfunction;
	tmsize_t i, n, nbytes;

	tf[0] = tf[1] = tf[2] = 0;
	if (td->td_bitspersample >= sizeof(tmsize_t) * 8 - 2)
		return 0;

	n = ((tmsize_t)1)<<td->td_bitspersample;
	nbytes = n * sizeof (uint16);
	if (!(tf[0] = (uint16 *)_TIFFmalloc(nbytes)))
		return 0;
	tf[0][0] = 0;
	for (i = 1; i < n; i++) {
		double t = (double)i/((double) n-1.);
		tf[0][i] = (uint16)floor(65535.*pow(t, 2.2) + .5);
	}

	if (td->td_samplesperpixel - td->td_extrasamples > 1) {
		if (!(tf[1] = (uint16 *)_TIFFmalloc(nbytes)))
			goto bad;
		_TIFFmemcpy(tf[1], tf[0], nbytes);
		if (!(tf[2] = (uint16 *)_TIFFmalloc(nbytes)))
			goto bad;
		_TIFFmemcpy(tf[2], tf[0], nbytes);
	}
	return 1;

bad:
	if (tf[0])
		_TIFFfree(tf[0]);
	if (tf[1])
		_TIFFfree(tf[1]);
	if (tf[2])
		_TIFFfree(tf[2]);
	tf[0] = tf[1] = tf[2] = 0;
	return 0;
}

static int
TIFFDefaultRefBlackWhite(TIFFDirectory* td)
{
	int i;

	if (!(td->td_refblackwhite = (float *)_TIFFmalloc(6*sizeof (float))))
		return 0;
        if (td->td_photometric == PHOTOMETRIC_YCBCR) {
		/*
		 * YCbCr (Class Y) images must have the ReferenceBlackWhite
		 * tag set. Fix the broken images, which lacks that tag.
		 */
		td->td_refblackwhite[0] = 0.0F;
		td->td_refblackwhite[1] = td->td_refblackwhite[3] =
			td->td_refblackwhite[5] = 255.0F;
		td->td_refblackwhite[2] = td->td_refblackwhite[4] = 128.0F;
	} else {
		/*
		 * Assume RGB (Class R)
		 */
		for (i = 0; i < 3; i++) {
		    td->td_refblackwhite[2*i+0] = 0;
		    td->td_refblackwhite[2*i+1] =
			    (float)((1L<<td->td_bitspersample)-1L);
		}
	}
	return 1;
}

/*
 * Like TIFFGetField, but return any default
 * value if the tag is not present in the directory.
 *
 * NB:	We use the value in the directory, rather than
 *	explcit values so that defaults exist only one
 *	place in the library -- in TIFFDefaultDirectory.
 */
int
TIFFVGetFieldDefaulted(TIFF* tif, uint32 tag, va_list ap)
{
	TIFFDirectory *td = &tif->tif_dir;

	if (TIFFVGetField(tif, tag, ap))
		return (1);
	switch (tag) {
	case TIFFTAG_SUBFILETYPE:
		*va_arg(ap, uint32 *) = td->td_subfiletype;
		return (1);
	case TIFFTAG_BITSPERSAMPLE:
		*va_arg(ap, uint16 *) = td->td_bitspersample;
		return (1);
	case TIFFTAG_THRESHHOLDING:
		*va_arg(ap, uint16 *) = td->td_threshholding;
		return (1);
	case TIFFTAG_FILLORDER:
		*va_arg(ap, uint16 *) = td->td_fillorder;
		return (1);
	case TIFFTAG_ORIENTATION:
		*va_arg(ap, uint16 *) = td->td_orientation;
		return (1);
	case TIFFTAG_SAMPLESPERPIXEL:
		*va_arg(ap, uint16 *) = td->td_samplesperpixel;
		return (1);
	case TIFFTAG_ROWSPERSTRIP:
		*va_arg(ap, uint32 *) = td->td_rowsperstrip;
		return (1);
	case TIFFTAG_MINSAMPLEVALUE:
		*va_arg(ap, uint16 *) = td->td_minsamplevalue;
		return (1);
	case TIFFTAG_MAXSAMPLEVALUE:
		*va_arg(ap, uint16 *) = td->td_maxsamplevalue;
		return (1);
	case TIFFTAG_PLANARCONFIG:
		*va_arg(ap, uint16 *) = td->td_planarconfig;
		return (1);
	case TIFFTAG_RESOLUTIONUNIT:
		*va_arg(ap, uint16 *) = td->td_resolutionunit;
		return (1);
	case TIFFTAG_PREDICTOR:
                {
			TIFFPredictorState* sp = (TIFFPredictorState*) tif->tif_data;
			*va_arg(ap, uint16*) = (uint16) sp->predictor;
			return 1;
                }
	case TIFFTAG_DOTRANGE:
		*va_arg(ap, uint16 *) = 0;
		*va_arg(ap, uint16 *) = (1<<td->td_bitspersample)-1;
		return (1);
	case TIFFTAG_INKSET:
		*va_arg(ap, uint16 *) = INKSET_CMYK;
		return 1;
	case TIFFTAG_NUMBEROFINKS:
		*va_arg(ap, uint16 *) = 4;
		return (1);
	case TIFFTAG_EXTRASAMPLES:
		*va_arg(ap, uint16 *) = td->td_extrasamples;
		*va_arg(ap, uint16 **) = td->td_sampleinfo;
		return (1);
	case TIFFTAG_MATTEING:
		*va_arg(ap, uint16 *) =
		    (td->td_extrasamples == 1 &&
		     td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
		return (1);
	case TIFFTAG_TILEDEPTH:
		*va_arg(ap, uint32 *) = td->td_tiledepth;
		return (1);
	case TIFFTAG_DATATYPE:
		*va_arg(ap, uint16 *) = td->td_sampleformat-1;
		return (1);
	case TIFFTAG_SAMPLEFORMAT:
		*va_arg(ap, uint16 *) = td->td_sampleformat;
                return(1);
	case TIFFTAG_IMAGEDEPTH:
		*va_arg(ap, uint32 *) = td->td_imagedepth;
		return (1);
	case TIFFTAG_YCBCRCOEFFICIENTS:
		{
			/* defaults are from CCIR Recommendation 601-1 */
			static float ycbcrcoeffs[] = { 0.299f, 0.587f, 0.114f };
			*va_arg(ap, float **) = ycbcrcoeffs;
			return 1;
		}
	case TIFFTAG_YCBCRSUBSAMPLING:
		*va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[0];
		*va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[1];
		return (1);
	case TIFFTAG_YCBCRPOSITIONING:
		*va_arg(ap, uint16 *) = td->td_ycbcrpositioning;
		return (1);
	case TIFFTAG_WHITEPOINT:
		{
			static float whitepoint[2];

			/* TIFF 6.0 specification tells that it is no default
			   value for the WhitePoint, but AdobePhotoshop TIFF
			   Technical Note tells that it should be CIE D50. */
			whitepoint[0] =	D50_X0 / (D50_X0 + D50_Y0 + D50_Z0);
			whitepoint[1] =	D50_Y0 / (D50_X0 + D50_Y0 + D50_Z0);
			*va_arg(ap, float **) = whitepoint;
			return 1;
		}
	case TIFFTAG_TRANSFERFUNCTION:
		if (!td->td_transferfunction[0] &&
		    !TIFFDefaultTransferFunction(td)) {
			TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "No space for \"TransferFunction\" tag");
			return (0);
		}
		*va_arg(ap, uint16 **) = td->td_transferfunction[0];
		if (td->td_samplesperpixel - td->td_extrasamples > 1) {
			*va_arg(ap, uint16 **) = td->td_transferfunction[1];
			*va_arg(ap, uint16 **) = td->td_transferfunction[2];
		}
		return (1);
	case TIFFTAG_REFERENCEBLACKWHITE:
		if (!td->td_refblackwhite && !TIFFDefaultRefBlackWhite(td))
			return (0);
		*va_arg(ap, float **) = td->td_refblackwhite;
		return (1);
	}
	return 0;
}

/*
 * Like TIFFGetField, but return any default
 * value if the tag is not present in the directory.
 */
int
TIFFGetFieldDefaulted(TIFF* tif, uint32 tag, ...)
{
	int ok;
	va_list ap;

	va_start(ap, tag);
	ok =  TIFFVGetFieldDefaulted(tif, tag, ap);
	va_end(ap);
	return (ok);
}

struct _Int64Parts {
	int32 low, high;
};

typedef union {
	struct _Int64Parts part;
	int64 value;
} _Int64;

float
_TIFFUInt64ToFloat(uint64 ui64)
{
	_Int64 i;

	i.value = ui64;
	if (i.part.high >= 0) {
		return (float)i.value;
	} else {
		long double df;
		df = (long double)i.value;
		df += 18446744073709551616.0; /* adding 2**64 */
		return (float)df;
	}
}

double
_TIFFUInt64ToDouble(uint64 ui64)
{
	_Int64 i;

	i.value = ui64;
	if (i.part.high >= 0) {
		return (double)i.value;
	} else {
		long double df;
		df = (long double)i.value;
		df += 18446744073709551616.0; /* adding 2**64 */
		return (double)df;
	}
}

/* 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	* Auxiliary Support Routines.
	30	*/
	31	#include "tiffiop.h"
	32	#include "tif_predict.h"
	33	#include <math.h>
	34
80ed523f VZ	35	uint32
80ed523f VZ	36	_TIFFMultiply32(TIFF* tif, uint32 first, uint32 second, const char* where)
8414a40c	37	{
80ed523f VZ	38	uint32 bytes = first * second;
	39
	40	if (second && bytes / second != first) {
	41	TIFFErrorExt(tif->tif_clientdata, where, "Integer overflow in %s", where);
	42	bytes = 0;
	43	}
	44
	45	return bytes;
	46	}
	47
	48	uint64
	49	_TIFFMultiply64(TIFF* tif, uint64 first, uint64 second, const char* where)
	50	{
	51	uint64 bytes = first * second;
	52
	53	if (second && bytes / second != first) {
	54	TIFFErrorExt(tif->tif_clientdata, where, "Integer overflow in %s", where);
	55	bytes = 0;
	56	}
	57
	58	return bytes;
	59	}
	60
	61	void*
	62	_TIFFCheckRealloc(TIFF* tif, void* buffer,
	63	tmsize_t nmemb, tmsize_t elem_size, const char* what)
	64	{
	65	void* cp = NULL;
	66	tmsize_t bytes = nmemb * elem_size;
8414a40c VZ	67
	68	/*
	69	* XXX: Check for integer overflow.
	70	*/
	71	if (nmemb && elem_size && bytes / elem_size == nmemb)
80ed523f VZ	72	cp = _TIFFrealloc(buffer, bytes);
	73
	74	if (cp == NULL) {
	75	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
	76	"Failed to allocate memory for %s "
	77	"(%ld elements of %ld bytes each)",
	78	what,(long) nmemb, (long) elem_size);
	79	}
8414a40c	80
80ed523f VZ	81	return cp;
80ed523f VZ	82	}
8414a40c	83
80ed523f VZ	84	void*
	85	_TIFFCheckMalloc(TIFF* tif, tmsize_t nmemb, tmsize_t elem_size, const char* what)
	86	{
	87	return _TIFFCheckRealloc(tif, NULL, nmemb, elem_size, what);
8414a40c VZ	88	}
	89
	90	static int
	91	TIFFDefaultTransferFunction(TIFFDirectory* td)
	92	{
	93	uint16 **tf = td->td_transferfunction;
80ed523f	94	tmsize_t i, n, nbytes;
8414a40c VZ	95
8414a40c VZ	96	tf[0] = tf[1] = tf[2] = 0;
80ed523f	97	if (td->td_bitspersample >= sizeof(tmsize_t) * 8 - 2)
8414a40c VZ	98	return 0;
8414a40c VZ	99
80ed523f	100	n = ((tmsize_t)1)<<td->td_bitspersample;
8414a40c VZ	101	nbytes = n * sizeof (uint16);
	102	if (!(tf[0] = (uint16 *)_TIFFmalloc(nbytes)))
	103	return 0;
	104	tf[0][0] = 0;
	105	for (i = 1; i < n; i++) {
	106	double t = (double)i/((double) n-1.);
	107	tf[0][i] = (uint16)floor(65535.*pow(t, 2.2) + .5);
	108	}
	109
	110	if (td->td_samplesperpixel - td->td_extrasamples > 1) {
	111	if (!(tf[1] = (uint16 *)_TIFFmalloc(nbytes)))
	112	goto bad;
	113	_TIFFmemcpy(tf[1], tf[0], nbytes);
	114	if (!(tf[2] = (uint16 *)_TIFFmalloc(nbytes)))
	115	goto bad;
	116	_TIFFmemcpy(tf[2], tf[0], nbytes);
	117	}
	118	return 1;
	119
	120	bad:
	121	if (tf[0])
	122	_TIFFfree(tf[0]);
	123	if (tf[1])
	124	_TIFFfree(tf[1]);
	125	if (tf[2])
	126	_TIFFfree(tf[2]);
	127	tf[0] = tf[1] = tf[2] = 0;
	128	return 0;
	129	}
	130
80ed523f VZ	131	static int
	132	TIFFDefaultRefBlackWhite(TIFFDirectory* td)
	133	{
	134	int i;
	135
	136	if (!(td->td_refblackwhite = (float )_TIFFmalloc(6sizeof (float))))
	137	return 0;
	138	if (td->td_photometric == PHOTOMETRIC_YCBCR) {
	139	/*
	140	* YCbCr (Class Y) images must have the ReferenceBlackWhite
	141	* tag set. Fix the broken images, which lacks that tag.
	142	*/
	143	td->td_refblackwhite[0] = 0.0F;
	144	td->td_refblackwhite[1] = td->td_refblackwhite[3] =
	145	td->td_refblackwhite[5] = 255.0F;
	146	td->td_refblackwhite[2] = td->td_refblackwhite[4] = 128.0F;
	147	} else {
	148	/*
	149	* Assume RGB (Class R)
	150	*/
	151	for (i = 0; i < 3; i++) {
	152	td->td_refblackwhite[2*i+0] = 0;
	153	td->td_refblackwhite[2*i+1] =
	154	(float)((1L<<td->td_bitspersample)-1L);
	155	}
	156	}
	157	return 1;
	158	}
	159
8414a40c VZ	160	/*
	161	* Like TIFFGetField, but return any default
	162	* value if the tag is not present in the directory.
	163	*
	164	* NB: We use the value in the directory, rather than
	165	* explcit values so that defaults exist only one
	166	* place in the library -- in TIFFDefaultDirectory.
	167	*/
	168	int
80ed523f	169	TIFFVGetFieldDefaulted(TIFF* tif, uint32 tag, va_list ap)
8414a40c VZ	170	{
	171	TIFFDirectory *td = &tif->tif_dir;
	172
	173	if (TIFFVGetField(tif, tag, ap))
	174	return (1);
	175	switch (tag) {
	176	case TIFFTAG_SUBFILETYPE:
	177	va_arg(ap, uint32 ) = td->td_subfiletype;
	178	return (1);
	179	case TIFFTAG_BITSPERSAMPLE:
	180	va_arg(ap, uint16 ) = td->td_bitspersample;
	181	return (1);
	182	case TIFFTAG_THRESHHOLDING:
	183	va_arg(ap, uint16 ) = td->td_threshholding;
	184	return (1);
	185	case TIFFTAG_FILLORDER:
	186	va_arg(ap, uint16 ) = td->td_fillorder;
	187	return (1);
	188	case TIFFTAG_ORIENTATION:
	189	va_arg(ap, uint16 ) = td->td_orientation;
	190	return (1);
	191	case TIFFTAG_SAMPLESPERPIXEL:
	192	va_arg(ap, uint16 ) = td->td_samplesperpixel;
	193	return (1);
	194	case TIFFTAG_ROWSPERSTRIP:
	195	va_arg(ap, uint32 ) = td->td_rowsperstrip;
	196	return (1);
	197	case TIFFTAG_MINSAMPLEVALUE:
	198	va_arg(ap, uint16 ) = td->td_minsamplevalue;
	199	return (1);
	200	case TIFFTAG_MAXSAMPLEVALUE:
	201	va_arg(ap, uint16 ) = td->td_maxsamplevalue;
	202	return (1);
	203	case TIFFTAG_PLANARCONFIG:
	204	va_arg(ap, uint16 ) = td->td_planarconfig;
	205	return (1);
	206	case TIFFTAG_RESOLUTIONUNIT:
	207	va_arg(ap, uint16 ) = td->td_resolutionunit;
	208	return (1);
	209	case TIFFTAG_PREDICTOR:
	210	{
	211	TIFFPredictorState* sp = (TIFFPredictorState*) tif->tif_data;
	212	va_arg(ap, uint16) = (uint16) sp->predictor;
	213	return 1;
	214	}
	215	case TIFFTAG_DOTRANGE:
	216	va_arg(ap, uint16 ) = 0;
	217	va_arg(ap, uint16 ) = (1<<td->td_bitspersample)-1;
	218	return (1);
	219	case TIFFTAG_INKSET:
	220	va_arg(ap, uint16 ) = INKSET_CMYK;
	221	return 1;
	222	case TIFFTAG_NUMBEROFINKS:
	223	va_arg(ap, uint16 ) = 4;
	224	return (1);
	225	case TIFFTAG_EXTRASAMPLES:
	226	va_arg(ap, uint16 ) = td->td_extrasamples;
	227	va_arg(ap, uint16 *) = td->td_sampleinfo;
	228	return (1);
	229	case TIFFTAG_MATTEING:
	230	va_arg(ap, uint16 ) =
	231	(td->td_extrasamples == 1 &&
	232	td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
	233	return (1);
234	case TIFFTAG_TILEDEPTH:
235	va_arg(ap, uint32 ) = td->td_tiledepth;
236	return (1);
237	case TIFFTAG_DATATYPE:
238	va_arg(ap, uint16 ) = td->td_sampleformat-1;
239	return (1);
240	case TIFFTAG_SAMPLEFORMAT:
241	va_arg(ap, uint16 ) = td->td_sampleformat;
242	return(1);
243	case TIFFTAG_IMAGEDEPTH:
244	va_arg(ap, uint32 ) = td->td_imagedepth;
245	return (1);
246	case TIFFTAG_YCBCRCOEFFICIENTS:
247	{
248	/* defaults are from CCIR Recommendation 601-1 */
249	static float ycbcrcoeffs[] = { 0.299f, 0.587f, 0.114f };
250	va_arg(ap, float *) = ycbcrcoeffs;
251	return 1;
252	}
253	case TIFFTAG_YCBCRSUBSAMPLING:
254	va_arg(ap, uint16 ) = td->td_ycbcrsubsampling[0];
255	va_arg(ap, uint16 ) = td->td_ycbcrsubsampling[1];
256	return (1);
257	case TIFFTAG_YCBCRPOSITIONING:
258	va_arg(ap, uint16 ) = td->td_ycbcrpositioning;
259	return (1);
260	case TIFFTAG_WHITEPOINT:
261	{
262	static float whitepoint[2];
263
264	/* TIFF 6.0 specification tells that it is no default
265	value for the WhitePoint, but AdobePhotoshop TIFF
266	Technical Note tells that it should be CIE D50. */
267	whitepoint[0] = D50_X0 / (D50_X0 + D50_Y0 + D50_Z0);
268	whitepoint[1] = D50_Y0 / (D50_X0 + D50_Y0 + D50_Z0);
269	va_arg(ap, float *) = whitepoint;
270	return 1;
271	}
272	case TIFFTAG_TRANSFERFUNCTION:
273	if (!td->td_transferfunction[0] &&
274	!TIFFDefaultTransferFunction(td)) {
275	TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "No space for \"TransferFunction\" tag");
276	return (0);
277	}
278	va_arg(ap, uint16 *) = td->td_transferfunction[0];
279	if (td->td_samplesperpixel - td->td_extrasamples > 1) {
280	va_arg(ap, uint16 *) = td->td_transferfunction[1];
281	va_arg(ap, uint16 *) = td->td_transferfunction[2];
282	}
283	return (1);
284	case TIFFTAG_REFERENCEBLACKWHITE:
80ed523f VZ	285	if (!td->td_refblackwhite && !TIFFDefaultRefBlackWhite(td))
	286	return (0);
	287	va_arg(ap, float *) = td->td_refblackwhite;
	288	return (1);
8414a40c VZ	289	}
	290	return 0;
	291	}
	292
	293	/*
	294	* Like TIFFGetField, but return any default
	295	* value if the tag is not present in the directory.
	296	*/
	297	int
80ed523f	298	TIFFGetFieldDefaulted(TIFF* tif, uint32 tag, ...)
8414a40c VZ	299	{
	300	int ok;
	301	va_list ap;
	302
	303	va_start(ap, tag);
	304	ok = TIFFVGetFieldDefaulted(tif, tag, ap);
	305	va_end(ap);
	306	return (ok);
	307	}
	308
80ed523f VZ	309	struct _Int64Parts {
	310	int32 low, high;
	311	};
	312
	313	typedef union {
	314	struct _Int64Parts part;
	315	int64 value;
	316	} _Int64;
	317
	318	float
	319	_TIFFUInt64ToFloat(uint64 ui64)
	320	{
	321	_Int64 i;
	322
	323	i.value = ui64;
	324	if (i.part.high >= 0) {
	325	return (float)i.value;
	326	} else {
	327	long double df;
	328	df = (long double)i.value;
	329	df += 18446744073709551616.0; /* adding 2*64 /
	330	return (float)df;
	331	}
	332	}
	333
	334	double
	335	_TIFFUInt64ToDouble(uint64 ui64)
	336	{
	337	_Int64 i;
	338
	339	i.value = ui64;
	340	if (i.part.high >= 0) {
	341	return (double)i.value;
	342	} else {
	343	long double df;
	344	df = (long double)i.value;
	345	df += 18446744073709551616.0; /* adding 2*64 /
	346	return (double)df;
	347	}
	348	}
	349
8414a40c	350	/* vim: set ts=8 sts=8 sw=8 noet: */
80ed523f VZ	351	/*
	352	* Local Variables:
	353	* mode: c
	354	* c-basic-offset: 8
	355	* fill-column: 78
	356	* End:
	357	*/