src/tiff/libtiff/tif_strip.c

   1 /* $Id$ */
   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  * Strip-organized Image Support Routines.
  31  */
  32 #include "tiffiop.h"
  33
  34 static uint32
  35 summarize(TIFF* tif, size_t summand1, size_t summand2, const char* where)
  36 {
  37         /*
  38          * XXX: We are using casting to uint32 here, bacause sizeof(size_t)
  39          * may be larger than sizeof(uint32) on 64-bit architectures.
  40          */
  41         uint32  bytes = summand1 + summand2;
  42
  43         if (bytes - summand1 != summand2) {
  44                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Integer overflow in %s", where);
  45                 bytes = 0;
  46         }
  47
  48         return (bytes);
  49 }
  50
  51 static uint32
  52 multiply(TIFF* tif, size_t nmemb, size_t elem_size, const char* where)
  53 {
  54         uint32  bytes = nmemb * elem_size;
  55
  56         if (elem_size && bytes / elem_size != nmemb) {
  57                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Integer overflow in %s", where);
  58                 bytes = 0;
  59         }
  60
  61         return (bytes);
  62 }
  63
  64 /*
  65  * Compute which strip a (row,sample) value is in.
  66  */
  67 tstrip_t
  68 TIFFComputeStrip(TIFF* tif, uint32 row, tsample_t sample)
  69 {
  70         TIFFDirectory *td = &tif->tif_dir;
  71         tstrip_t strip;
  72
  73         strip = row / td->td_rowsperstrip;
  74         if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
  75                 if (sample >= td->td_samplesperpixel) {
  76                         TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  77                             "%lu: Sample out of range, max %lu",
  78                             (unsigned long) sample, (unsigned long) td->td_samplesperpixel);
  79                         return ((tstrip_t) 0);
  80                 }
  81                 strip += sample*td->td_stripsperimage;
  82         }
  83         return (strip);
  84 }
  85
  86 /*
  87  * Compute how many strips are in an image.
  88  */
  89 tstrip_t
  90 TIFFNumberOfStrips(TIFF* tif)
  91 {
  92         TIFFDirectory *td = &tif->tif_dir;
  93         tstrip_t nstrips;
  94
  95         nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 :
  96              TIFFhowmany(td->td_imagelength, td->td_rowsperstrip));
  97         if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
  98                 nstrips = multiply(tif, nstrips, td->td_samplesperpixel,
  99                                    "TIFFNumberOfStrips");
 100         return (nstrips);
 101 }
 102
 103 /*
 104  * Compute the # bytes in a variable height, row-aligned strip.
 105  */
 106 tsize_t
 107 TIFFVStripSize(TIFF* tif, uint32 nrows)
 108 {
 109         TIFFDirectory *td = &tif->tif_dir;
 110
 111         if (nrows == (uint32) -1)
 112                 nrows = td->td_imagelength;
 113         if (td->td_planarconfig == PLANARCONFIG_CONTIG &&
 114             td->td_photometric == PHOTOMETRIC_YCBCR &&
 115             !isUpSampled(tif)) {
 116                 /*
 117                  * Packed YCbCr data contain one Cb+Cr for every
 118                  * HorizontalSampling*VerticalSampling Y values.
 119                  * Must also roundup width and height when calculating
 120                  * since images that are not a multiple of the
 121                  * horizontal/vertical subsampling area include
 122                  * YCbCr data for the extended image.
 123                  */
 124                 uint16 ycbcrsubsampling[2];
 125                 tsize_t w, scanline, samplingarea;
 126
 127                 TIFFGetField( tif, TIFFTAG_YCBCRSUBSAMPLING,
 128                               ycbcrsubsampling + 0,
 129                               ycbcrsubsampling + 1 );
 130
 131                 samplingarea = ycbcrsubsampling[0]*ycbcrsubsampling[1];
 132                 if (samplingarea == 0) {
 133                         TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
 134                                      "Invalid YCbCr subsampling");
 135                         return 0;
 136                 }
 137
 138                 w = TIFFroundup(td->td_imagewidth, ycbcrsubsampling[0]);
 139                 scanline = TIFFhowmany8(multiply(tif, w, td->td_bitspersample,
 140                                                  "TIFFVStripSize"));
 141                 nrows = TIFFroundup(nrows, ycbcrsubsampling[1]);
 142                 /* NB: don't need TIFFhowmany here 'cuz everything is rounded */
 143                 scanline = multiply(tif, nrows, scanline, "TIFFVStripSize");
 144                 return ((tsize_t)
 145                     summarize(tif, scanline,
 146                               multiply(tif, 2, scanline / samplingarea,
 147                                        "TIFFVStripSize"), "TIFFVStripSize"));
 148         } else
 149                 return ((tsize_t) multiply(tif, nrows, TIFFScanlineSize(tif),
 150                                            "TIFFVStripSize"));
 151 }
 152
 153
 154 /*
 155  * Compute the # bytes in a raw strip.
 156  */
 157 tsize_t
 158 TIFFRawStripSize(TIFF* tif, tstrip_t strip)
 159 {
 160         TIFFDirectory* td = &tif->tif_dir;
 161         tsize_t bytecount = td->td_stripbytecount[strip];
 162
 163         if (bytecount <= 0) {
 164                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
 165                           "%lu: Invalid strip byte count, strip %lu",
 166                           (unsigned long) bytecount, (unsigned long) strip);
 167                 bytecount = (tsize_t) -1;
 168         }
 169
 170         return bytecount;
 171 }
 172
 173 /*
 174  * Compute the # bytes in a (row-aligned) strip.
 175  *
 176  * Note that if RowsPerStrip is larger than the
 177  * recorded ImageLength, then the strip size is
 178  * truncated to reflect the actual space required
 179  * to hold the strip.
 180  */
 181 tsize_t
 182 TIFFStripSize(TIFF* tif)
 183 {
 184         TIFFDirectory* td = &tif->tif_dir;
 185         uint32 rps = td->td_rowsperstrip;
 186         if (rps > td->td_imagelength)
 187                 rps = td->td_imagelength;
 188         return (TIFFVStripSize(tif, rps));
 189 }
 190
 191 /*
 192  * Compute a default strip size based on the image
 193  * characteristics and a requested value.  If the
 194  * request is <1 then we choose a strip size according
 195  * to certain heuristics.
 196  */
 197 uint32
 198 TIFFDefaultStripSize(TIFF* tif, uint32 request)
 199 {
 200         return (*tif->tif_defstripsize)(tif, request);
 201 }
 202
 203 uint32
 204 _TIFFDefaultStripSize(TIFF* tif, uint32 s)
 205 {
 206         if ((int32) s < 1) {
 207                 /*
 208                  * If RowsPerStrip is unspecified, try to break the
 209                  * image up into strips that are approximately
 210                  * STRIP_SIZE_DEFAULT bytes long.
 211                  */
 212                 tsize_t scanline = TIFFScanlineSize(tif);
 213                 s = (uint32)STRIP_SIZE_DEFAULT / (scanline == 0 ? 1 : scanline);
 214                 if (s == 0)             /* very wide images */
 215                         s = 1;
 216         }
 217         return (s);
 218 }
 219
 220 /*
 221  * Return the number of bytes to read/write in a call to
 222  * one of the scanline-oriented i/o routines.  Note that
 223  * this number may be 1/samples-per-pixel if data is
 224  * stored as separate planes.
 225  */
 226 tsize_t
 227 TIFFScanlineSize(TIFF* tif)
 228 {
 229         TIFFDirectory *td = &tif->tif_dir;
 230         tsize_t scanline;
 231
 232         if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
 233                 if (td->td_photometric == PHOTOMETRIC_YCBCR
 234                     && !isUpSampled(tif)) {
 235                         uint16 ycbcrsubsampling[2];
 236
 237                         TIFFGetField(tif, TIFFTAG_YCBCRSUBSAMPLING,
 238                                      ycbcrsubsampling + 0,
 239                                      ycbcrsubsampling + 1);
 240
 241                         if (ycbcrsubsampling[0] == 0) {
 242                                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
 243                                              "Invalid YCbCr subsampling");
 244                                 return 0;
 245                         }
 246
 247                         scanline = TIFFroundup(td->td_imagewidth,
 248                                                ycbcrsubsampling[0]);
 249                         scanline = TIFFhowmany8(multiply(tif, scanline,
 250                                                          td->td_bitspersample,
 251                                                          "TIFFScanlineSize"));
 252                         return ((tsize_t)
 253                                 summarize(tif, scanline,
 254                                           multiply(tif, 2,
 255                                                 scanline / ycbcrsubsampling[0],
 256                                                 "TIFFVStripSize"),
 257                                           "TIFFVStripSize"));
 258                 } else {
 259                         scanline = multiply(tif, td->td_imagewidth,
 260                                             td->td_samplesperpixel,
 261                                             "TIFFScanlineSize");
 262                 }
 263         } else
 264                 scanline = td->td_imagewidth;
 265         return ((tsize_t) TIFFhowmany8(multiply(tif, scanline,
 266                                                 td->td_bitspersample,
 267                                                 "TIFFScanlineSize")));
 268 }
 269
 270 /*
 271  * Return the number of bytes required to store a complete
 272  * decoded and packed raster scanline (as opposed to the
 273  * I/O size returned by TIFFScanlineSize which may be less
 274  * if data is store as separate planes).
 275  */
 276 tsize_t
 277 TIFFRasterScanlineSize(TIFF* tif)
 278 {
 279         TIFFDirectory *td = &tif->tif_dir;
 280         tsize_t scanline;
 281
 282         scanline = multiply (tif, td->td_bitspersample, td->td_imagewidth,
 283                              "TIFFRasterScanlineSize");
 284         if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
 285                 scanline = multiply (tif, scanline, td->td_samplesperpixel,
 286                                      "TIFFRasterScanlineSize");
 287                 return ((tsize_t) TIFFhowmany8(scanline));
 288         } else
 289                 return ((tsize_t) multiply (tif, TIFFhowmany8(scanline),
 290                                             td->td_samplesperpixel,
 291                                             "TIFFRasterScanlineSize"));
 292 }
 293
 294 /* vim: set ts=8 sts=8 sw=8 noet: */