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#ifndef lint
static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_aux.c,v 1.17 92/11/27 11:41:30 sam Exp $";
#endif
/*
* Copyright (c) 1991, 1992 Sam Leffler
* Copyright (c) 1991, 1992 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.
*/
#ifdef COLORIMETRY_SUPPORT
#include <math.h>
#endif
#include "tiffiop.h"
/*
* 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.
*/
DECLARE3(TIFFVGetFieldDefaulted, TIFF*, tif, u_int, tag, va_list, ap)
{
TIFFDirectory *td = &tif->tif_dir;
int i;
if (TIFFVGetField(tif, tag, ap))
return (1);
switch (tag) {
case TIFFTAG_SUBFILETYPE:
*va_arg(ap, u_short *) = td->td_subfiletype;
return (1);
case TIFFTAG_BITSPERSAMPLE:
*va_arg(ap, u_short *) = td->td_bitspersample;
return (1);
case TIFFTAG_THRESHHOLDING:
*va_arg(ap, u_short *) = td->td_threshholding;
return (1);
case TIFFTAG_FILLORDER:
*va_arg(ap, u_short *) = td->td_fillorder;
return (1);
case TIFFTAG_ORIENTATION:
*va_arg(ap, u_short *) = td->td_orientation;
return (1);
case TIFFTAG_SAMPLESPERPIXEL:
*va_arg(ap, u_short *) = td->td_samplesperpixel;
return (1);
case TIFFTAG_ROWSPERSTRIP:
*va_arg(ap, u_long *) = td->td_rowsperstrip;
return (1);
case TIFFTAG_MINSAMPLEVALUE:
*va_arg(ap, u_short *) = td->td_minsamplevalue;
return (1);
case TIFFTAG_MAXSAMPLEVALUE:
*va_arg(ap, u_short *) = td->td_maxsamplevalue;
return (1);
case TIFFTAG_PLANARCONFIG:
*va_arg(ap, u_short *) = td->td_planarconfig;
return (1);
case TIFFTAG_GROUP4OPTIONS:
*va_arg(ap, u_long *) = td->td_group4options;
return (1);
case TIFFTAG_RESOLUTIONUNIT:
*va_arg(ap, u_short *) = td->td_resolutionunit;
return (1);
case TIFFTAG_PREDICTOR:
*va_arg(ap, u_short *) = td->td_predictor;
return (1);
#ifdef CMYK_SUPPORT
case TIFFTAG_DOTRANGE:
*va_arg(ap, u_short *) = 0;
*va_arg(ap, u_short *) = (1<<td->td_bitspersample)-1;
return (1);
case TIFFTAG_INKSET:
*va_arg(ap, u_short *) = td->td_inkset;
return (1);
#endif
case TIFFTAG_EXTRASAMPLES:
*va_arg(ap, u_short *) = EXTRASAMPLE_ASSOCALPHA;
case TIFFTAG_MATTEING:
*va_arg(ap, u_short *) = td->td_matteing;
return (1);
case TIFFTAG_TILEDEPTH:
*va_arg(ap, u_long *) = td->td_tiledepth;
return (1);
case TIFFTAG_DATATYPE:
*va_arg(ap, u_short *) = td->td_sampleformat-1;
return (1);
case TIFFTAG_IMAGEDEPTH:
*va_arg(ap, u_short *) = td->td_imagedepth;
return (1);
#ifdef YCBCR_SUPPORT
case TIFFTAG_YCBCRCOEFFICIENTS:
if (!td->td_ycbcrcoeffs) {
td->td_ycbcrcoeffs = (float *)
_TIFFmalloc(3*sizeof (float));
/* defaults are from CCIR Recommendation 601-1 */
td->td_ycbcrcoeffs[0] = .299;
td->td_ycbcrcoeffs[1] = .587;
td->td_ycbcrcoeffs[2] = .114;
}
*va_arg(ap, float **) = td->td_ycbcrcoeffs;
return (1);
case TIFFTAG_YCBCRSUBSAMPLING:
*va_arg(ap, u_short *) = td->td_ycbcrsubsampling[0];
*va_arg(ap, u_short *) = td->td_ycbcrsubsampling[1];
return (1);
case TIFFTAG_YCBCRPOSITIONING:
*va_arg(ap, u_short *) = td->td_ycbcrpositioning;
return (1);
#endif
#ifdef COLORIMETRY_SUPPORT
case TIFFTAG_TRANSFERFUNCTION:
if (!td->td_transferfunction[0]) {
u_short **tf = td->td_transferfunction;
int n = 1<<td->td_bitspersample;
tf[0] = (u_short *)_TIFFmalloc(n * sizeof (u_short));
tf[0][0] = 0;
for (i = 1; i < n; i++)
tf[0][i] = (u_short)
floor(65535.*pow(i/(n-1.), 2.2) + .5);
for (i = 1; i < td->td_samplesperpixel; i++) {
tf[i] = (u_short *)
_TIFFmalloc(n * sizeof (u_short));
memcpy(tf[i], tf[0], n * sizeof (u_short));
}
}
for (i = 0; i < td->td_samplesperpixel; i++)
*va_arg(ap, u_short **) = td->td_transferfunction[i];
return (1);
case TIFFTAG_REFERENCEBLACKWHITE:
if (!td->td_refblackwhite) {
td->td_refblackwhite = (float *)
_TIFFmalloc(2*td->td_samplesperpixel*sizeof (float));
for (i = 0; i < td->td_samplesperpixel; i++) {
td->td_refblackwhite[2*i+0] = 0;
td->td_refblackwhite[2*i+1] = 1L<<td->td_bitspersample;
}
}
*va_arg(ap, float **) = td->td_refblackwhite;
return (1);
#endif
}
return (0);
}
/*
* Like TIFFGetField, but return any default
* value if the tag is not present in the directory.
*/
/*VARARGS2*/
DECLARE2V(TIFFGetFieldDefaulted, TIFF*, tif, u_int, tag)
{
int ok;
va_list ap;
VA_START(ap, tag);
ok = TIFFVGetFieldDefaulted(tif, tag, ap);
va_end(ap);
return (ok);
}
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