src/tiff/tif_aux.c

   1 /* $Header$ */
   2
   3 /*
   4  * Copyright (c) 1991-1997 Sam Leffler
   5  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and
   8  * its documentation for any purpose is hereby granted without fee, provided
   9  * that (i) the above copyright notices and this permission notice appear in
  10  * all copies of the software and related documentation, and (ii) the names of
  11  * Sam Leffler and Silicon Graphics may not be used in any advertising or
  12  * publicity relating to the software without the specific, prior written
  13  * permission of Sam Leffler and Silicon Graphics.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  17  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
  20  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  21  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  22  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  */
  26
  27 /*
  28  * TIFF Library.
  29  *
  30  * Auxiliary Support Routines.
  31  */
  32 #include "tiffiop.h"
  33
  34 #ifdef COLORIMETRY_SUPPORT
  35 #include <math.h>
  36
  37 static void
  38 TIFFDefaultTransferFunction(TIFFDirectory* td)
  39 {
  40         uint16 **tf = td->td_transferfunction;
  41         long i, n = 1<<td->td_bitspersample;
  42
  43         tf[0] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
  44         tf[0][0] = 0;
  45         for (i = 1; i < n; i++) {
  46                 double t = (double)i/((double) n-1.);
  47                 tf[0][i] = (uint16)floor(65535.*pow(t, 2.2) + .5);
  48         }
  49         if (td->td_samplesperpixel - td->td_extrasamples > 1) {
  50                 tf[1] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
  51                 _TIFFmemcpy(tf[1], tf[0], n * sizeof (uint16));
  52                 tf[2] = (uint16 *)_TIFFmalloc(n * sizeof (uint16));
  53                 _TIFFmemcpy(tf[2], tf[0], n * sizeof (uint16));
  54         }
  55 }
  56
  57 static void
  58 TIFFDefaultRefBlackWhite(TIFFDirectory* td)
  59 {
  60         int i;
  61
  62         td->td_refblackwhite = (float *)_TIFFmalloc(6*sizeof (float));
  63         for (i = 0; i < 3; i++) {
  64             td->td_refblackwhite[2*i+0] = 0;
  65             td->td_refblackwhite[2*i+1] = (float)((1L<<td->td_bitspersample)-1L);
  66         }
  67 }
  68 #endif
  69
  70 /*
  71  * Like TIFFGetField, but return any default
  72  * value if the tag is not present in the directory.
  73  *
  74  * NB:  We use the value in the directory, rather than
  75  *      explcit values so that defaults exist only one
  76  *      place in the library -- in TIFFDefaultDirectory.
  77  */
  78 int
  79 TIFFVGetFieldDefaulted(TIFF* tif, ttag_t tag, va_list ap)
  80 {
  81         TIFFDirectory *td = &tif->tif_dir;
  82
  83         if (TIFFVGetField(tif, tag, ap))
  84                 return (1);
  85         switch (tag) {
  86         case TIFFTAG_SUBFILETYPE:
  87                 *va_arg(ap, uint32 *) = td->td_subfiletype;
  88                 return (1);
  89         case TIFFTAG_BITSPERSAMPLE:
  90                 *va_arg(ap, uint16 *) = td->td_bitspersample;
  91                 return (1);
  92         case TIFFTAG_THRESHHOLDING:
  93                 *va_arg(ap, uint16 *) = td->td_threshholding;
  94                 return (1);
  95         case TIFFTAG_FILLORDER:
  96                 *va_arg(ap, uint16 *) = td->td_fillorder;
  97                 return (1);
  98         case TIFFTAG_ORIENTATION:
  99                 *va_arg(ap, uint16 *) = td->td_orientation;
 100                 return (1);
 101         case TIFFTAG_SAMPLESPERPIXEL:
 102                 *va_arg(ap, uint16 *) = td->td_samplesperpixel;
 103                 return (1);
 104         case TIFFTAG_ROWSPERSTRIP:
 105                 *va_arg(ap, uint32 *) = td->td_rowsperstrip;
 106                 return (1);
 107         case TIFFTAG_MINSAMPLEVALUE:
 108                 *va_arg(ap, uint16 *) = td->td_minsamplevalue;
 109                 return (1);
 110         case TIFFTAG_MAXSAMPLEVALUE:
 111                 *va_arg(ap, uint16 *) = td->td_maxsamplevalue;
 112                 return (1);
 113         case TIFFTAG_PLANARCONFIG:
 114                 *va_arg(ap, uint16 *) = td->td_planarconfig;
 115                 return (1);
 116         case TIFFTAG_RESOLUTIONUNIT:
 117                 *va_arg(ap, uint16 *) = td->td_resolutionunit;
 118                 return (1);
 119 #ifdef CMYK_SUPPORT
 120         case TIFFTAG_DOTRANGE:
 121                 *va_arg(ap, uint16 *) = 0;
 122                 *va_arg(ap, uint16 *) = (1<<td->td_bitspersample)-1;
 123                 return (1);
 124         case TIFFTAG_INKSET:
 125                 *va_arg(ap, uint16 *) = td->td_inkset;
 126                 return (1);
 127         case TIFFTAG_NUMBEROFINKS:
 128                 *va_arg(ap, uint16 *) = td->td_ninks;
 129                 return (1);
 130 #endif
 131         case TIFFTAG_EXTRASAMPLES:
 132                 *va_arg(ap, uint16 *) = td->td_extrasamples;
 133                 *va_arg(ap, uint16 **) = td->td_sampleinfo;
 134                 return (1);
 135         case TIFFTAG_MATTEING:
 136                 *va_arg(ap, uint16 *) =
 137                     (td->td_extrasamples == 1 &&
 138                      td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
 139                 return (1);
 140         case TIFFTAG_TILEDEPTH:
 141                 *va_arg(ap, uint32 *) = td->td_tiledepth;
 142                 return (1);
 143         case TIFFTAG_DATATYPE:
 144                 *va_arg(ap, uint16 *) = td->td_sampleformat-1;
 145                 return (1);
 146         case TIFFTAG_IMAGEDEPTH:
 147                 *va_arg(ap, uint32 *) = td->td_imagedepth;
 148                 return (1);
 149 #ifdef YCBCR_SUPPORT
 150         case TIFFTAG_YCBCRCOEFFICIENTS:
 151                 if (!td->td_ycbcrcoeffs) {
 152                         td->td_ycbcrcoeffs = (float *)
 153                             _TIFFmalloc(3*sizeof (float));
 154                         /* defaults are from CCIR Recommendation 601-1 */
 155                         td->td_ycbcrcoeffs[0] = 0.299f;
 156                         td->td_ycbcrcoeffs[1] = 0.587f;
 157                         td->td_ycbcrcoeffs[2] = 0.114f;
 158                 }
 159                 *va_arg(ap, float **) = td->td_ycbcrcoeffs;
 160                 return (1);
 161         case TIFFTAG_YCBCRSUBSAMPLING:
 162                 *va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[0];
 163                 *va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[1];
 164                 return (1);
 165         case TIFFTAG_YCBCRPOSITIONING:
 166                 *va_arg(ap, uint16 *) = td->td_ycbcrpositioning;
 167                 return (1);
 168 #endif
 169 #ifdef COLORIMETRY_SUPPORT
 170         case TIFFTAG_TRANSFERFUNCTION:
 171                 if (!td->td_transferfunction[0])
 172                         TIFFDefaultTransferFunction(td);
 173                 *va_arg(ap, uint16 **) = td->td_transferfunction[0];
 174                 if (td->td_samplesperpixel - td->td_extrasamples > 1) {
 175                         *va_arg(ap, uint16 **) = td->td_transferfunction[1];
 176                         *va_arg(ap, uint16 **) = td->td_transferfunction[2];
 177                 }
 178                 return (1);
 179         case TIFFTAG_REFERENCEBLACKWHITE:
 180                 if (!td->td_refblackwhite)
 181                         TIFFDefaultRefBlackWhite(td);
 182                 *va_arg(ap, float **) = td->td_refblackwhite;
 183                 return (1);
 184 #endif
 185         }
 186         return (0);
 187 }
 188
 189 /*
 190  * Like TIFFGetField, but return any default
 191  * value if the tag is not present in the directory.
 192  */
 193 int
 194 TIFFGetFieldDefaulted(TIFF* tif, ttag_t tag, ...)
 195 {
 196         int ok;
 197         va_list ap;
 198
 199         va_start(ap, tag);
 200         ok =  TIFFVGetFieldDefaulted(tif, tag, ap);
 201         va_end(ap);
 202         return (ok);
 203 }