Initial revision

1 files changed, 203 insertions, 0 deletions

diff --git a/libtiff/tif_aux.c b/libtiff/tif_aux.c
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+/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_aux.c,v 1.1 1999-07-27 21:50:27 mike 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_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);
+}