/* $Header: /cvsroot/osrs/libtiff/libtiff/tif_aux.c,v 1.3 2000/03/03 15:22:00 warmerda 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.
*
* Auxiliary Support Routines.
*/
#include "tiffiop.h"
#ifdef COLORIMETRY_SUPPORT
#include <math.h>
static void
TIFFDefaultTransferFunction(TIFFDirectory* td)
{
uint16 **tf = td->td_transferfunction;
long i, n = 1<<td->td_bitspersample;
tf[0] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
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) {
tf[1] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
_TIFFmemcpy(tf[1], tf[0], n * sizeof (uint16));
tf[2] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
_TIFFmemcpy(tf[2], tf[0], n * sizeof (uint16));
}
}
static void
TIFFDefaultRefBlackWhite(TIFFDirectory* td)
{
int i;
td->td_refblackwhite = (float *)_TIFFmalloc(6*sizeof (float));
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);
}
}
#endif
/*
* 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, ttag_t 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);
#ifdef CMYK_SUPPORT
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 *) = td->td_inkset;
return (1);
case TIFFTAG_NUMBEROFINKS:
*va_arg(ap, uint16 *) = td->td_ninks;
return (1);
#endif
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);
#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] = 0.299f;
td->td_ycbcrcoeffs[1] = 0.587f;
td->td_ycbcrcoeffs[2] = 0.114f;
}
*va_arg(ap, float **) = td->td_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);
#endif
#ifdef COLORIMETRY_SUPPORT
case TIFFTAG_TRANSFERFUNCTION:
if (!td->td_transferfunction[0])
TIFFDefaultTransferFunction(td);
*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);
*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.
*/
int
TIFFGetFieldDefaulted(TIFF* tif, ttag_t tag, ...)
{
int ok;
va_list ap;
va_start(ap, tag);
ok = TIFFVGetFieldDefaulted(tif, tag, ap);
va_end(ap);
return (ok);
}
Submit an article or tip