home *** CD-ROM | disk | FTP | other *** search
- #ifndef lint
- static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_aux.c,v 1.21 93/08/26 14:19:50 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.
- */
- #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++)
- tf[0][i] = (uint16)floor(65535.*pow(i/(n-1.), 2.2) + .5);
- if (td->td_samplesperpixel - td->td_extrasamples > 1) {
- tf[1] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
- memcpy(tf[1], tf[0], n * sizeof (uint16));
- tf[2] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
- memcpy(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] = 1L<<td->td_bitspersample;
- }
- }
- #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.
- */
- 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, uint16 *) = 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_GROUP4OPTIONS:
- *va_arg(ap, uint32 *) = td->td_group4options;
- return (1);
- case TIFFTAG_RESOLUTIONUNIT:
- *va_arg(ap, uint16 *) = td->td_resolutionunit;
- return (1);
- case TIFFTAG_PREDICTOR:
- *va_arg(ap, uint16 *) = td->td_predictor;
- 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);
- #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_IMAGEDEPTH:
- *va_arg(ap, uint16 *) = 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, 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.
- */
- 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);
- }
-