1 /*
2 * Copyright (c) 1991-1997 Sam Leffler
3 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and
6 * its documentation for any purpose is hereby granted without fee, provided
7 * that (i) the above copyright notices and this permission notice appear in
8 * all copies of the software and related documentation, and (ii) the names of
9 * Sam Leffler and Silicon Graphics may not be used in any advertising or
10 * publicity relating to the software without the specific, prior written
11 * permission of Sam Leffler and Silicon Graphics.
12 *
13 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16 *
17 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
18 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22 * OF THIS SOFTWARE.
23 */
24
25 /*
26 * TIFF Library.
27 *
28 * Strip-organized Image Support Routines.
29 */
30 #include "tiffiop.h"
31
32 /*
33 * Compute which strip a (row,sample) value is in.
34 */
35 uint32
TIFFComputeStrip(TIFF * tif,uint32 row,uint16 sample)36 TIFFComputeStrip(TIFF* tif, uint32 row, uint16 sample)
37 {
38 static const char module[] = "TIFFComputeStrip";
39 TIFFDirectory *td = &tif->tif_dir;
40 uint32 strip;
41
42 strip = row / td->td_rowsperstrip;
43 if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
44 if (sample >= td->td_samplesperpixel) {
45 TIFFErrorExt(tif->tif_clientdata, module,
46 "%lu: Sample out of range, max %lu",
47 (unsigned long) sample, (unsigned long) td->td_samplesperpixel);
48 return (0);
49 }
50 strip += (uint32)sample*td->td_stripsperimage;
51 }
52 return (strip);
53 }
54
55 /*
56 * Compute how many strips are in an image.
57 */
58 uint32
TIFFNumberOfStrips(TIFF * tif)59 TIFFNumberOfStrips(TIFF* tif)
60 {
61 TIFFDirectory *td = &tif->tif_dir;
62 uint32 nstrips;
63
64 nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 :
65 TIFFhowmany_32(td->td_imagelength, td->td_rowsperstrip));
66 if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
67 nstrips = _TIFFMultiply32(tif, nstrips, (uint32)td->td_samplesperpixel,
68 "TIFFNumberOfStrips");
69 return (nstrips);
70 }
71
72 /*
73 * Compute the # bytes in a variable height, row-aligned strip.
74 */
75 uint64
TIFFVStripSize64(TIFF * tif,uint32 nrows)76 TIFFVStripSize64(TIFF* tif, uint32 nrows)
77 {
78 static const char module[] = "TIFFVStripSize64";
79 TIFFDirectory *td = &tif->tif_dir;
80 if (nrows==(uint32)(-1))
81 nrows=td->td_imagelength;
82 if ((td->td_planarconfig==PLANARCONFIG_CONTIG)&&
83 (td->td_photometric == PHOTOMETRIC_YCBCR)&&
84 (!isUpSampled(tif)))
85 {
86 /*
87 * Packed YCbCr data contain one Cb+Cr for every
88 * HorizontalSampling*VerticalSampling Y values.
89 * Must also roundup width and height when calculating
90 * since images that are not a multiple of the
91 * horizontal/vertical subsampling area include
92 * YCbCr data for the extended image.
93 */
94 uint16 ycbcrsubsampling[2];
95 uint16 samplingblock_samples;
96 uint32 samplingblocks_hor;
97 uint32 samplingblocks_ver;
98 uint64 samplingrow_samples;
99 uint64 samplingrow_size;
100 if(td->td_samplesperpixel!=3)
101 {
102 TIFFErrorExt(tif->tif_clientdata,module,
103 "Invalid td_samplesperpixel value");
104 return 0;
105 }
106 TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,ycbcrsubsampling+0,
107 ycbcrsubsampling+1);
108 if ((ycbcrsubsampling[0] != 1 && ycbcrsubsampling[0] != 2 && ycbcrsubsampling[0] != 4)
109 ||(ycbcrsubsampling[1] != 1 && ycbcrsubsampling[1] != 2 && ycbcrsubsampling[1] != 4))
110 {
111 TIFFErrorExt(tif->tif_clientdata,module,
112 "Invalid YCbCr subsampling (%dx%d)",
113 ycbcrsubsampling[0],
114 ycbcrsubsampling[1] );
115 return 0;
116 }
117 samplingblock_samples=ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;
118 samplingblocks_hor=TIFFhowmany_32(td->td_imagewidth,ycbcrsubsampling[0]);
119 samplingblocks_ver=TIFFhowmany_32(nrows,ycbcrsubsampling[1]);
120 samplingrow_samples=_TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);
121 samplingrow_size=TIFFhowmany8_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module));
122 return(_TIFFMultiply64(tif,samplingrow_size,samplingblocks_ver,module));
123 }
124 else
125 return(_TIFFMultiply64(tif,nrows,TIFFScanlineSize64(tif),module));
126 }
127 tmsize_t
TIFFVStripSize(TIFF * tif,uint32 nrows)128 TIFFVStripSize(TIFF* tif, uint32 nrows)
129 {
130 static const char module[] = "TIFFVStripSize";
131 uint64 m;
132 m=TIFFVStripSize64(tif,nrows);
133 return _TIFFCastUInt64ToSSize(tif, m, module);
134 }
135
136 /*
137 * Compute the # bytes in a raw strip.
138 */
139 uint64
TIFFRawStripSize64(TIFF * tif,uint32 strip)140 TIFFRawStripSize64(TIFF* tif, uint32 strip)
141 {
142 static const char module[] = "TIFFRawStripSize64";
143 uint64 bytecount = TIFFGetStrileByteCount(tif, strip);
144
145 if (bytecount == 0)
146 {
147 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
148 TIFFErrorExt(tif->tif_clientdata, module,
149 "%I64u: Invalid strip byte count, strip %lu",
150 (unsigned __int64) bytecount,
151 (unsigned long) strip);
152 #else
153 TIFFErrorExt(tif->tif_clientdata, module,
154 "%llu: Invalid strip byte count, strip %lu",
155 (unsigned long long) bytecount,
156 (unsigned long) strip);
157 #endif
158 bytecount = (uint64) -1;
159 }
160
161 return bytecount;
162 }
163 tmsize_t
TIFFRawStripSize(TIFF * tif,uint32 strip)164 TIFFRawStripSize(TIFF* tif, uint32 strip)
165 {
166 static const char module[] = "TIFFRawStripSize";
167 uint64 m;
168 tmsize_t n;
169 m=TIFFRawStripSize64(tif,strip);
170 if (m==(uint64)(-1))
171 n=(tmsize_t)(-1);
172 else
173 {
174 n=(tmsize_t)m;
175 if ((uint64)n!=m)
176 {
177 TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
178 n=0;
179 }
180 }
181 return(n);
182 }
183
184 /*
185 * Compute the # bytes in a (row-aligned) strip.
186 *
187 * Note that if RowsPerStrip is larger than the
188 * recorded ImageLength, then the strip size is
189 * truncated to reflect the actual space required
190 * to hold the strip.
191 */
192 uint64
TIFFStripSize64(TIFF * tif)193 TIFFStripSize64(TIFF* tif)
194 {
195 TIFFDirectory* td = &tif->tif_dir;
196 uint32 rps = td->td_rowsperstrip;
197 if (rps > td->td_imagelength)
198 rps = td->td_imagelength;
199 return (TIFFVStripSize64(tif, rps));
200 }
201 tmsize_t
TIFFStripSize(TIFF * tif)202 TIFFStripSize(TIFF* tif)
203 {
204 static const char module[] = "TIFFStripSize";
205 uint64 m;
206 m=TIFFStripSize64(tif);
207 return _TIFFCastUInt64ToSSize(tif, m, module);
208 }
209
210 /*
211 * Compute a default strip size based on the image
212 * characteristics and a requested value. If the
213 * request is <1 then we choose a strip size according
214 * to certain heuristics.
215 */
216 uint32
TIFFDefaultStripSize(TIFF * tif,uint32 request)217 TIFFDefaultStripSize(TIFF* tif, uint32 request)
218 {
219 return (*tif->tif_defstripsize)(tif, request);
220 }
221
222 uint32
_TIFFDefaultStripSize(TIFF * tif,uint32 s)223 _TIFFDefaultStripSize(TIFF* tif, uint32 s)
224 {
225 if ((int32) s < 1) {
226 /*
227 * If RowsPerStrip is unspecified, try to break the
228 * image up into strips that are approximately
229 * STRIP_SIZE_DEFAULT bytes long.
230 */
231 uint64 scanlinesize;
232 uint64 rows;
233 scanlinesize=TIFFScanlineSize64(tif);
234 if (scanlinesize==0)
235 scanlinesize=1;
236 rows=(uint64)STRIP_SIZE_DEFAULT/scanlinesize;
237 if (rows==0)
238 rows=1;
239 else if (rows>0xFFFFFFFF)
240 rows=0xFFFFFFFF;
241 s=(uint32)rows;
242 }
243 return (s);
244 }
245
246 /*
247 * Return the number of bytes to read/write in a call to
248 * one of the scanline-oriented i/o routines. Note that
249 * this number may be 1/samples-per-pixel if data is
250 * stored as separate planes.
251 * The ScanlineSize in case of YCbCrSubsampling is defined as the
252 * strip size divided by the strip height, i.e. the size of a pack of vertical
253 * subsampling lines divided by vertical subsampling. It should thus make
254 * sense when multiplied by a multiple of vertical subsampling.
255 */
256 uint64
TIFFScanlineSize64(TIFF * tif)257 TIFFScanlineSize64(TIFF* tif)
258 {
259 static const char module[] = "TIFFScanlineSize64";
260 TIFFDirectory *td = &tif->tif_dir;
261 uint64 scanline_size;
262 if (td->td_planarconfig==PLANARCONFIG_CONTIG)
263 {
264 if ((td->td_photometric==PHOTOMETRIC_YCBCR)&&
265 (td->td_samplesperpixel==3)&&
266 (!isUpSampled(tif)))
267 {
268 uint16 ycbcrsubsampling[2];
269 uint16 samplingblock_samples;
270 uint32 samplingblocks_hor;
271 uint64 samplingrow_samples;
272 uint64 samplingrow_size;
273 if(td->td_samplesperpixel!=3)
274 {
275 TIFFErrorExt(tif->tif_clientdata,module,
276 "Invalid td_samplesperpixel value");
277 return 0;
278 }
279 TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,
280 ycbcrsubsampling+0,
281 ycbcrsubsampling+1);
282 if (((ycbcrsubsampling[0]!=1)&&(ycbcrsubsampling[0]!=2)&&(ycbcrsubsampling[0]!=4)) ||
283 ((ycbcrsubsampling[1]!=1)&&(ycbcrsubsampling[1]!=2)&&(ycbcrsubsampling[1]!=4)))
284 {
285 TIFFErrorExt(tif->tif_clientdata,module,
286 "Invalid YCbCr subsampling");
287 return 0;
288 }
289 samplingblock_samples = ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;
290 samplingblocks_hor = TIFFhowmany_32(td->td_imagewidth,ycbcrsubsampling[0]);
291 samplingrow_samples = _TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);
292 samplingrow_size = TIFFhowmany_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module),8);
293 scanline_size = (samplingrow_size/ycbcrsubsampling[1]);
294 }
295 else
296 {
297 uint64 scanline_samples;
298 scanline_samples=_TIFFMultiply64(tif,td->td_imagewidth,td->td_samplesperpixel,module);
299 scanline_size=TIFFhowmany_64(_TIFFMultiply64(tif,scanline_samples,td->td_bitspersample,module),8);
300 }
301 }
302 else
303 {
304 scanline_size=TIFFhowmany_64(_TIFFMultiply64(tif,td->td_imagewidth,td->td_bitspersample,module),8);
305 }
306 if (scanline_size == 0)
307 {
308 TIFFErrorExt(tif->tif_clientdata,module,"Computed scanline size is zero");
309 return 0;
310 }
311 return(scanline_size);
312 }
313 tmsize_t
TIFFScanlineSize(TIFF * tif)314 TIFFScanlineSize(TIFF* tif)
315 {
316 static const char module[] = "TIFFScanlineSize";
317 uint64 m;
318 m=TIFFScanlineSize64(tif);
319 return _TIFFCastUInt64ToSSize(tif, m, module);
320 }
321
322 /*
323 * Return the number of bytes required to store a complete
324 * decoded and packed raster scanline (as opposed to the
325 * I/O size returned by TIFFScanlineSize which may be less
326 * if data is store as separate planes).
327 */
328 uint64
TIFFRasterScanlineSize64(TIFF * tif)329 TIFFRasterScanlineSize64(TIFF* tif)
330 {
331 static const char module[] = "TIFFRasterScanlineSize64";
332 TIFFDirectory *td = &tif->tif_dir;
333 uint64 scanline;
334
335 scanline = _TIFFMultiply64(tif, td->td_bitspersample, td->td_imagewidth, module);
336 if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
337 scanline = _TIFFMultiply64(tif, scanline, td->td_samplesperpixel, module);
338 return (TIFFhowmany8_64(scanline));
339 } else
340 return (_TIFFMultiply64(tif, TIFFhowmany8_64(scanline),
341 td->td_samplesperpixel, module));
342 }
343 tmsize_t
TIFFRasterScanlineSize(TIFF * tif)344 TIFFRasterScanlineSize(TIFF* tif)
345 {
346 static const char module[] = "TIFFRasterScanlineSize";
347 uint64 m;
348 m=TIFFRasterScanlineSize64(tif);
349 return _TIFFCastUInt64ToSSize(tif, m, module);
350 }
351
352 /* vim: set ts=8 sts=8 sw=8 noet: */
353 /*
354 * Local Variables:
355 * mode: c
356 * c-basic-offset: 8
357 * fill-column: 78
358 * End:
359 */
360