[wxWidgets.git] / src / tiff / libtiff / tif_aux.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.
 *
 * 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	/* $Id$ */
	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	* Auxiliary Support Routines.
	31	*/
	32	#include "tiffiop.h"
	33	#include "tif_predict.h"
	34	#include <math.h>
	35
80ed523f VZ	36	uint32
80ed523f VZ	37	_TIFFMultiply32(TIFF* tif, uint32 first, uint32 second, const char* where)
8414a40c	38	{
80ed523f VZ	39	uint32 bytes = first * second;
	40
	41	if (second && bytes / second != first) {
	42	TIFFErrorExt(tif->tif_clientdata, where, "Integer overflow in %s", where);
	43	bytes = 0;
	44	}
	45
	46	return bytes;
	47	}
	48
	49	uint64
	50	_TIFFMultiply64(TIFF* tif, uint64 first, uint64 second, const char* where)
	51	{
	52	uint64 bytes = first * second;
	53
	54	if (second && bytes / second != first) {
	55	TIFFErrorExt(tif->tif_clientdata, where, "Integer overflow in %s", where);
	56	bytes = 0;
	57	}
	58
	59	return bytes;
	60	}
	61
	62	void*
	63	_TIFFCheckRealloc(TIFF* tif, void* buffer,
	64	tmsize_t nmemb, tmsize_t elem_size, const char* what)
	65	{
	66	void* cp = NULL;
	67	tmsize_t bytes = nmemb * elem_size;
8414a40c VZ	68
	69	/*
	70	* XXX: Check for integer overflow.
	71	*/
	72	if (nmemb && elem_size && bytes / elem_size == nmemb)
80ed523f VZ	73	cp = _TIFFrealloc(buffer, bytes);
	74
	75	if (cp == NULL) {
	76	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
	77	"Failed to allocate memory for %s "
	78	"(%ld elements of %ld bytes each)",
	79	what,(long) nmemb, (long) elem_size);
	80	}
8414a40c	81
80ed523f VZ	82	return cp;
80ed523f VZ	83	}
8414a40c	84
80ed523f VZ	85	void*
	86	_TIFFCheckMalloc(TIFF* tif, tmsize_t nmemb, tmsize_t elem_size, const char* what)
	87	{
	88	return _TIFFCheckRealloc(tif, NULL, nmemb, elem_size, what);
8414a40c VZ	89	}
	90
	91	static int
	92	TIFFDefaultTransferFunction(TIFFDirectory* td)
	93	{
	94	uint16 **tf = td->td_transferfunction;
80ed523f	95	tmsize_t i, n, nbytes;
8414a40c VZ	96
8414a40c VZ	97	tf[0] = tf[1] = tf[2] = 0;
80ed523f	98	if (td->td_bitspersample >= sizeof(tmsize_t) * 8 - 2)
8414a40c VZ	99	return 0;
8414a40c VZ	100
80ed523f	101	n = ((tmsize_t)1)<<td->td_bitspersample;
8414a40c VZ	102	nbytes = n * sizeof (uint16);
	103	if (!(tf[0] = (uint16 *)_TIFFmalloc(nbytes)))
	104	return 0;
	105	tf[0][0] = 0;
	106	for (i = 1; i < n; i++) {
	107	double t = (double)i/((double) n-1.);
	108	tf[0][i] = (uint16)floor(65535.*pow(t, 2.2) + .5);
	109	}
	110
	111	if (td->td_samplesperpixel - td->td_extrasamples > 1) {
	112	if (!(tf[1] = (uint16 *)_TIFFmalloc(nbytes)))
	113	goto bad;
	114	_TIFFmemcpy(tf[1], tf[0], nbytes);
	115	if (!(tf[2] = (uint16 *)_TIFFmalloc(nbytes)))
	116	goto bad;
	117	_TIFFmemcpy(tf[2], tf[0], nbytes);
	118	}
	119	return 1;
	120
	121	bad:
	122	if (tf[0])
	123	_TIFFfree(tf[0]);
	124	if (tf[1])
	125	_TIFFfree(tf[1]);
	126	if (tf[2])
	127	_TIFFfree(tf[2]);
	128	tf[0] = tf[1] = tf[2] = 0;
	129	return 0;
	130	}
	131
80ed523f VZ	132	static int
	133	TIFFDefaultRefBlackWhite(TIFFDirectory* td)
	134	{
	135	int i;
	136
	137	if (!(td->td_refblackwhite = (float )_TIFFmalloc(6sizeof (float))))
	138	return 0;
	139	if (td->td_photometric == PHOTOMETRIC_YCBCR) {
	140	/*
	141	* YCbCr (Class Y) images must have the ReferenceBlackWhite
	142	* tag set. Fix the broken images, which lacks that tag.
	143	*/
	144	td->td_refblackwhite[0] = 0.0F;
	145	td->td_refblackwhite[1] = td->td_refblackwhite[3] =
	146	td->td_refblackwhite[5] = 255.0F;
	147	td->td_refblackwhite[2] = td->td_refblackwhite[4] = 128.0F;
	148	} else {
	149	/*
	150	* Assume RGB (Class R)
	151	*/
	152	for (i = 0; i < 3; i++) {
	153	td->td_refblackwhite[2*i+0] = 0;
	154	td->td_refblackwhite[2*i+1] =
	155	(float)((1L<<td->td_bitspersample)-1L);
	156	}
	157	}
	158	return 1;
	159	}
	160
8414a40c VZ	161	/*
	162	* Like TIFFGetField, but return any default
	163	* value if the tag is not present in the directory.
	164	*
	165	* NB: We use the value in the directory, rather than
	166	* explcit values so that defaults exist only one
	167	* place in the library -- in TIFFDefaultDirectory.
	168	*/
	169	int
80ed523f	170	TIFFVGetFieldDefaulted(TIFF* tif, uint32 tag, va_list ap)
8414a40c VZ	171	{
	172	TIFFDirectory *td = &tif->tif_dir;
	173
	174	if (TIFFVGetField(tif, tag, ap))
	175	return (1);
	176	switch (tag) {
	177	case TIFFTAG_SUBFILETYPE:
	178	va_arg(ap, uint32 ) = td->td_subfiletype;
	179	return (1);
	180	case TIFFTAG_BITSPERSAMPLE:
	181	va_arg(ap, uint16 ) = td->td_bitspersample;
	182	return (1);
	183	case TIFFTAG_THRESHHOLDING:
	184	va_arg(ap, uint16 ) = td->td_threshholding;
	185	return (1);
	186	case TIFFTAG_FILLORDER:
	187	va_arg(ap, uint16 ) = td->td_fillorder;
	188	return (1);
	189	case TIFFTAG_ORIENTATION:
	190	va_arg(ap, uint16 ) = td->td_orientation;
	191	return (1);
	192	case TIFFTAG_SAMPLESPERPIXEL:
	193	va_arg(ap, uint16 ) = td->td_samplesperpixel;
	194	return (1);
	195	case TIFFTAG_ROWSPERSTRIP:
	196	va_arg(ap, uint32 ) = td->td_rowsperstrip;
	197	return (1);
	198	case TIFFTAG_MINSAMPLEVALUE:
	199	va_arg(ap, uint16 ) = td->td_minsamplevalue;
	200	return (1);
	201	case TIFFTAG_MAXSAMPLEVALUE:
	202	va_arg(ap, uint16 ) = td->td_maxsamplevalue;
	203	return (1);
	204	case TIFFTAG_PLANARCONFIG:
	205	va_arg(ap, uint16 ) = td->td_planarconfig;
	206	return (1);
	207	case TIFFTAG_RESOLUTIONUNIT:
	208	va_arg(ap, uint16 ) = td->td_resolutionunit;
	209	return (1);
	210	case TIFFTAG_PREDICTOR:
	211	{
	212	TIFFPredictorState* sp = (TIFFPredictorState*) tif->tif_data;
	213	va_arg(ap, uint16) = (uint16) sp->predictor;
	214	return 1;
	215	}
	216	case TIFFTAG_DOTRANGE:
	217	va_arg(ap, uint16 ) = 0;
	218	va_arg(ap, uint16 ) = (1<<td->td_bitspersample)-1;
	219	return (1);
	220	case TIFFTAG_INKSET:
	221	va_arg(ap, uint16 ) = INKSET_CMYK;
	222	return 1;
	223	case TIFFTAG_NUMBEROFINKS:
	224	va_arg(ap, uint16 ) = 4;
	225	return (1);
	226	case TIFFTAG_EXTRASAMPLES:
	227	va_arg(ap, uint16 ) = td->td_extrasamples;
	228	va_arg(ap, uint16 *) = td->td_sampleinfo;
	229	return (1);
	230	case TIFFTAG_MATTEING:
	231	va_arg(ap, uint16 ) =
	232	(td->td_extrasamples == 1 &&
	233	td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
	234	return (1);
235	case TIFFTAG_TILEDEPTH:
236	va_arg(ap, uint32 ) = td->td_tiledepth;
237	return (1);
238	case TIFFTAG_DATATYPE:
239	va_arg(ap, uint16 ) = td->td_sampleformat-1;
240	return (1);
241	case TIFFTAG_SAMPLEFORMAT:
242	va_arg(ap, uint16 ) = td->td_sampleformat;
243	return(1);
244	case TIFFTAG_IMAGEDEPTH:
245	va_arg(ap, uint32 ) = td->td_imagedepth;
246	return (1);
247	case TIFFTAG_YCBCRCOEFFICIENTS:
248	{
249	/* defaults are from CCIR Recommendation 601-1 */
250	static float ycbcrcoeffs[] = { 0.299f, 0.587f, 0.114f };
251	va_arg(ap, float *) = ycbcrcoeffs;
252	return 1;
253	}
254	case TIFFTAG_YCBCRSUBSAMPLING:
255	va_arg(ap, uint16 ) = td->td_ycbcrsubsampling[0];
256	va_arg(ap, uint16 ) = td->td_ycbcrsubsampling[1];
257	return (1);
258	case TIFFTAG_YCBCRPOSITIONING:
259	va_arg(ap, uint16 ) = td->td_ycbcrpositioning;
260	return (1);
261	case TIFFTAG_WHITEPOINT:
262	{
263	static float whitepoint[2];
264
265	/* TIFF 6.0 specification tells that it is no default
266	value for the WhitePoint, but AdobePhotoshop TIFF
267	Technical Note tells that it should be CIE D50. */
268	whitepoint[0] = D50_X0 / (D50_X0 + D50_Y0 + D50_Z0);
269	whitepoint[1] = D50_Y0 / (D50_X0 + D50_Y0 + D50_Z0);
270	va_arg(ap, float *) = whitepoint;
271	return 1;
272	}
273	case TIFFTAG_TRANSFERFUNCTION:
274	if (!td->td_transferfunction[0] &&
275	!TIFFDefaultTransferFunction(td)) {
276	TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "No space for \"TransferFunction\" tag");
277	return (0);
278	}
279	va_arg(ap, uint16 *) = td->td_transferfunction[0];
280	if (td->td_samplesperpixel - td->td_extrasamples > 1) {
281	va_arg(ap, uint16 *) = td->td_transferfunction[1];
282	va_arg(ap, uint16 *) = td->td_transferfunction[2];
283	}
284	return (1);
285	case TIFFTAG_REFERENCEBLACKWHITE:
80ed523f VZ	286	if (!td->td_refblackwhite && !TIFFDefaultRefBlackWhite(td))
	287	return (0);
	288	va_arg(ap, float *) = td->td_refblackwhite;
	289	return (1);
8414a40c VZ	290	}
	291	return 0;
	292	}
	293
	294	/*
	295	* Like TIFFGetField, but return any default
	296	* value if the tag is not present in the directory.
	297	*/
	298	int
80ed523f	299	TIFFGetFieldDefaulted(TIFF* tif, uint32 tag, ...)
8414a40c VZ	300	{
	301	int ok;
	302	va_list ap;
	303
	304	va_start(ap, tag);
	305	ok = TIFFVGetFieldDefaulted(tif, tag, ap);
	306	va_end(ap);
	307	return (ok);
	308	}
	309
80ed523f VZ	310	struct _Int64Parts {
	311	int32 low, high;
	312	};
	313
	314	typedef union {
	315	struct _Int64Parts part;
	316	int64 value;
	317	} _Int64;
	318
	319	float
	320	_TIFFUInt64ToFloat(uint64 ui64)
	321	{
	322	_Int64 i;
	323
	324	i.value = ui64;
	325	if (i.part.high >= 0) {
	326	return (float)i.value;
	327	} else {
	328	long double df;
	329	df = (long double)i.value;
	330	df += 18446744073709551616.0; /* adding 2*64 /
	331	return (float)df;
	332	}
	333	}
	334
	335	double
	336	_TIFFUInt64ToDouble(uint64 ui64)
	337	{
	338	_Int64 i;
	339
	340	i.value = ui64;
	341	if (i.part.high >= 0) {
	342	return (double)i.value;
	343	} else {
	344	long double df;
	345	df = (long double)i.value;
	346	df += 18446744073709551616.0; /* adding 2*64 /
	347	return (double)df;
	348	}
	349	}
	350
8414a40c	351	/* vim: set ts=8 sts=8 sw=8 noet: */
80ed523f VZ	352	/*
	353	* Local Variables:
	354	* mode: c
	355	* c-basic-offset: 8
	356	* fill-column: 78
	357	* End:
	358	*/