400 lines
6.4 KiB
C
400 lines
6.4 KiB
C
/* $Header: /roq/tiff/tif_aux.c 1 11/02/99 4:39p Zaphod $ */
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/*
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* Copyright (c) 1991-1996 Sam Leffler
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* Copyright (c) 1991-1996 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library.
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*
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* Auxiliary Support Routines.
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*/
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#include "tiffiop.h"
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#ifdef COLORIMETRY_SUPPORT
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#include <math.h>
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static void
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TIFFDefaultTransferFunction(TIFFDirectory* td)
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{
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uint16 **tf = td->td_transferfunction;
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long i, n = 1<<td->td_bitspersample;
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tf[0] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
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tf[0][0] = 0;
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for (i = 1; i < n; i++) {
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double t = (double)i/((double) n-1.);
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tf[0][i] = (uint16)floor(65535.*pow(t, 2.2) + .5);
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}
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if (td->td_samplesperpixel - td->td_extrasamples > 1) {
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tf[1] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
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_TIFFmemcpy(tf[1], tf[0], n * sizeof (uint16));
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tf[2] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
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_TIFFmemcpy(tf[2], tf[0], n * sizeof (uint16));
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}
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}
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static void
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TIFFDefaultRefBlackWhite(TIFFDirectory* td)
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{
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int i;
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td->td_refblackwhite = (float *)_TIFFmalloc(6*sizeof (float));
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for (i = 0; i < 3; i++) {
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td->td_refblackwhite[2*i+0] = 0;
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td->td_refblackwhite[2*i+1] = (float)((1L<<td->td_bitspersample)-1L);
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}
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}
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#endif
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/*
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* Like TIFFGetField, but return any default
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* value if the tag is not present in the directory.
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*
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* NB: We use the value in the directory, rather than
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* explcit values so that defaults exist only one
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* place in the library -- in TIFFDefaultDirectory.
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*/
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int
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TIFFVGetFieldDefaulted(TIFF* tif, ttag_t tag, va_list ap)
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{
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TIFFDirectory *td = &tif->tif_dir;
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if (TIFFVGetField(tif, tag, ap))
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return (1);
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switch (tag) {
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case TIFFTAG_SUBFILETYPE:
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*va_arg(ap, uint32 *) = td->td_subfiletype;
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return (1);
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case TIFFTAG_BITSPERSAMPLE:
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*va_arg(ap, uint16 *) = td->td_bitspersample;
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return (1);
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case TIFFTAG_THRESHHOLDING:
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*va_arg(ap, uint16 *) = td->td_threshholding;
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return (1);
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case TIFFTAG_FILLORDER:
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*va_arg(ap, uint16 *) = td->td_fillorder;
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return (1);
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case TIFFTAG_ORIENTATION:
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*va_arg(ap, uint16 *) = td->td_orientation;
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return (1);
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case TIFFTAG_SAMPLESPERPIXEL:
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*va_arg(ap, uint16 *) = td->td_samplesperpixel;
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return (1);
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case TIFFTAG_ROWSPERSTRIP:
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*va_arg(ap, uint32 *) = td->td_rowsperstrip;
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return (1);
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case TIFFTAG_MINSAMPLEVALUE:
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*va_arg(ap, uint16 *) = td->td_minsamplevalue;
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return (1);
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case TIFFTAG_MAXSAMPLEVALUE:
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*va_arg(ap, uint16 *) = td->td_maxsamplevalue;
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return (1);
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case TIFFTAG_PLANARCONFIG:
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*va_arg(ap, uint16 *) = td->td_planarconfig;
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return (1);
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case TIFFTAG_RESOLUTIONUNIT:
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*va_arg(ap, uint16 *) = td->td_resolutionunit;
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return (1);
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#ifdef CMYK_SUPPORT
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case TIFFTAG_DOTRANGE:
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*va_arg(ap, uint16 *) = 0;
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*va_arg(ap, uint16 *) = (1<<td->td_bitspersample)-1;
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return (1);
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case TIFFTAG_INKSET:
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*va_arg(ap, uint16 *) = td->td_inkset;
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return (1);
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#endif
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case TIFFTAG_EXTRASAMPLES:
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*va_arg(ap, uint16 *) = td->td_extrasamples;
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*va_arg(ap, uint16 **) = td->td_sampleinfo;
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return (1);
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case TIFFTAG_MATTEING:
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*va_arg(ap, uint16 *) =
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(td->td_extrasamples == 1 &&
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td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
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return (1);
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case TIFFTAG_TILEDEPTH:
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*va_arg(ap, uint32 *) = td->td_tiledepth;
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return (1);
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case TIFFTAG_DATATYPE:
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*va_arg(ap, uint16 *) = td->td_sampleformat-1;
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return (1);
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case TIFFTAG_IMAGEDEPTH:
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*va_arg(ap, uint32 *) = td->td_imagedepth;
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return (1);
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#ifdef YCBCR_SUPPORT
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case TIFFTAG_YCBCRCOEFFICIENTS:
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if (!td->td_ycbcrcoeffs) {
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td->td_ycbcrcoeffs = (float *)
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_TIFFmalloc(3*sizeof (float));
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/* defaults are from CCIR Recommendation 601-1 */
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td->td_ycbcrcoeffs[0] = 0.299f;
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td->td_ycbcrcoeffs[1] = 0.587f;
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td->td_ycbcrcoeffs[2] = 0.114f;
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}
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*va_arg(ap, float **) = td->td_ycbcrcoeffs;
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return (1);
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case TIFFTAG_YCBCRSUBSAMPLING:
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*va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[0];
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*va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[1];
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return (1);
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case TIFFTAG_YCBCRPOSITIONING:
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*va_arg(ap, uint16 *) = td->td_ycbcrpositioning;
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return (1);
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#endif
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#ifdef COLORIMETRY_SUPPORT
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case TIFFTAG_TRANSFERFUNCTION:
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if (!td->td_transferfunction[0])
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TIFFDefaultTransferFunction(td);
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*va_arg(ap, uint16 **) = td->td_transferfunction[0];
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if (td->td_samplesperpixel - td->td_extrasamples > 1) {
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*va_arg(ap, uint16 **) = td->td_transferfunction[1];
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*va_arg(ap, uint16 **) = td->td_transferfunction[2];
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}
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return (1);
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case TIFFTAG_REFERENCEBLACKWHITE:
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if (!td->td_refblackwhite)
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TIFFDefaultRefBlackWhite(td);
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*va_arg(ap, float **) = td->td_refblackwhite;
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return (1);
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#endif
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}
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return (0);
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}
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/*
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* Like TIFFGetField, but return any default
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* value if the tag is not present in the directory.
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*/
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int
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TIFFGetFieldDefaulted(TIFF* tif, ttag_t tag, ...)
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{
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int ok;
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va_list ap;
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va_start(ap, tag);
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ok = TIFFVGetFieldDefaulted(tif, tag, ap);
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va_end(ap);
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return (ok);
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}
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