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1/* $Id: tif_strip.c,v 1.35 2012-06-06 05:33:55 fwarmerdam Exp $ */
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/*
35 * Compute which strip a (row,sample) value is in.
36 */
37uint32
38TIFFComputeStrip(TIFF* tif, uint32 row, uint16 sample)
39{
40 static const char module[] = "TIFFComputeStrip";
41 TIFFDirectory *td = &tif->tif_dir;
42 uint32 strip;
43
44 strip = row / td->td_rowsperstrip;
45 if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
46 if (sample >= td->td_samplesperpixel) {
47 TIFFErrorExt(tif->tif_clientdata, module,
48 "%lu: Sample out of range, max %lu",
49 (unsigned long) sample, (unsigned long) td->td_samplesperpixel);
50 return (0);
51 }
52 strip += (uint32)sample*td->td_stripsperimage;
53 }
54 return (strip);
55}
56
57/*
58 * Compute how many strips are in an image.
59 */
60uint32
61TIFFNumberOfStrips(TIFF* tif)
62{
63 TIFFDirectory *td = &tif->tif_dir;
64 uint32 nstrips;
65
66 nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 :
67 TIFFhowmany_32(td->td_imagelength, td->td_rowsperstrip));
68 if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
69 nstrips = _TIFFMultiply32(tif, nstrips, (uint32)td->td_samplesperpixel,
70 "TIFFNumberOfStrips");
71 return (nstrips);
72}
73
74/*
75 * Compute the # bytes in a variable height, row-aligned strip.
76 */
77uint64
78TIFFVStripSize64(TIFF* tif, uint32 nrows)
79{
80 static const char module[] = "TIFFVStripSize64";
81 TIFFDirectory *td = &tif->tif_dir;
82 if (nrows==(uint32)(-1))
83 nrows=td->td_imagelength;
84 if ((td->td_planarconfig==PLANARCONFIG_CONTIG)&&
85 (td->td_photometric == PHOTOMETRIC_YCBCR)&&
86 (!isUpSampled(tif)))
87 {
88 /*
89 * Packed YCbCr data contain one Cb+Cr for every
90 * HorizontalSampling*VerticalSampling Y values.
91 * Must also roundup width and height when calculating
92 * since images that are not a multiple of the
93 * horizontal/vertical subsampling area include
94 * YCbCr data for the extended image.
95 */
96 uint16 ycbcrsubsampling[2];
97 uint16 samplingblock_samples;
98 uint32 samplingblocks_hor;
99 uint32 samplingblocks_ver;
100 uint64 samplingrow_samples;
101 uint64 samplingrow_size;
102 if(td->td_samplesperpixel!=3)
103 {
104 TIFFErrorExt(tif->tif_clientdata,module,
105 "Invalid td_samplesperpixel value");
106 return 0;
107 }
108 TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,ycbcrsubsampling+0,
109 ycbcrsubsampling+1);
110 if ((ycbcrsubsampling[0] != 1 && ycbcrsubsampling[0] != 2 && ycbcrsubsampling[0] != 4)
111 ||(ycbcrsubsampling[1] != 1 && ycbcrsubsampling[1] != 2 && ycbcrsubsampling[1] != 4))
112 {
113 TIFFErrorExt(tif->tif_clientdata,module,
114 "Invalid YCbCr subsampling (%dx%d)",
115 ycbcrsubsampling[0],
116 ycbcrsubsampling[1] );
117 return 0;
118 }
119 samplingblock_samples=ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;
120 samplingblocks_hor=TIFFhowmany_32(td->td_imagewidth,ycbcrsubsampling[0]);
121 samplingblocks_ver=TIFFhowmany_32(nrows,ycbcrsubsampling[1]);
122 samplingrow_samples=_TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);
123 samplingrow_size=TIFFhowmany8_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module));
124 return(_TIFFMultiply64(tif,samplingrow_size,samplingblocks_ver,module));
125 }
126 else
127 return(_TIFFMultiply64(tif,nrows,TIFFScanlineSize64(tif),module));
128}
129tmsize_t
130TIFFVStripSize(TIFF* tif, uint32 nrows)
131{
132 static const char module[] = "TIFFVStripSize";
133 uint64 m;
134 tmsize_t n;
135 m=TIFFVStripSize64(tif,nrows);
136 n=(tmsize_t)m;
137 if ((uint64)n!=m)
138 {
139 TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
140 n=0;
141 }
142 return(n);
143}
144
145/*
146 * Compute the # bytes in a raw strip.
147 */
148uint64
149TIFFRawStripSize64(TIFF* tif, uint32 strip)
150{
151 static const char module[] = "TIFFRawStripSize64";
152 TIFFDirectory* td = &tif->tif_dir;
153 uint64 bytecount = td->td_stripbytecount[strip];
154
155 if (bytecount == 0)
156 {
157#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
158 TIFFErrorExt(tif->tif_clientdata, module,
159 "%I64u: Invalid strip byte count, strip %lu",
160 (unsigned __int64) bytecount,
161 (unsigned long) strip);
162#else
163 TIFFErrorExt(tif->tif_clientdata, module,
164 "%llu: Invalid strip byte count, strip %lu",
165 (unsigned long long) bytecount,
166 (unsigned long) strip);
167#endif
168 bytecount = (uint64) -1;
169 }
170
171 return bytecount;
172}
173tmsize_t
174TIFFRawStripSize(TIFF* tif, uint32 strip)
175{
176 static const char module[] = "TIFFRawStripSize";
177 uint64 m;
178 tmsize_t n;
179 m=TIFFRawStripSize64(tif,strip);
180 if (m==(uint64)(-1))
181 n=(tmsize_t)(-1);
182 else
183 {
184 n=(tmsize_t)m;
185 if ((uint64)n!=m)
186 {
187 TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
188 n=0;
189 }
190 }
191 return(n);
192}
193
194/*
195 * Compute the # bytes in a (row-aligned) strip.
196 *
197 * Note that if RowsPerStrip is larger than the
198 * recorded ImageLength, then the strip size is
199 * truncated to reflect the actual space required
200 * to hold the strip.
201 */
202uint64
203TIFFStripSize64(TIFF* tif)
204{
205 TIFFDirectory* td = &tif->tif_dir;
206 uint32 rps = td->td_rowsperstrip;
207 if (rps > td->td_imagelength)
208 rps = td->td_imagelength;
209 return (TIFFVStripSize64(tif, rps));
210}
211tmsize_t
212TIFFStripSize(TIFF* tif)
213{
214 static const char module[] = "TIFFStripSize";
215 uint64 m;
216 tmsize_t n;
217 m=TIFFStripSize64(tif);
218 n=(tmsize_t)m;
219 if ((uint64)n!=m)
220 {
221 TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
222 n=0;
223 }
224 return(n);
225}
226
227/*
228 * Compute a default strip size based on the image
229 * characteristics and a requested value. If the
230 * request is <1 then we choose a strip size according
231 * to certain heuristics.
232 */
233uint32
234TIFFDefaultStripSize(TIFF* tif, uint32 request)
235{
236 return (*tif->tif_defstripsize)(tif, request);
237}
238
239uint32
240_TIFFDefaultStripSize(TIFF* tif, uint32 s)
241{
242 if ((int32) s < 1) {
243 /*
244 * If RowsPerStrip is unspecified, try to break the
245 * image up into strips that are approximately
246 * STRIP_SIZE_DEFAULT bytes long.
247 */
248 uint64 scanlinesize;
249 uint64 rows;
250 scanlinesize=TIFFScanlineSize64(tif);
251 if (scanlinesize==0)
252 scanlinesize=1;
253 rows=(uint64)STRIP_SIZE_DEFAULT/scanlinesize;
254 if (rows==0)
255 rows=1;
256 else if (rows>0xFFFFFFFF)
257 rows=0xFFFFFFFF;
258 s=(uint32)rows;
259 }
260 return (s);
261}
262
263/*
264 * Return the number of bytes to read/write in a call to
265 * one of the scanline-oriented i/o routines. Note that
266 * this number may be 1/samples-per-pixel if data is
267 * stored as separate planes.
268 * The ScanlineSize in case of YCbCrSubsampling is defined as the
269 * strip size divided by the strip height, i.e. the size of a pack of vertical
270 * subsampling lines divided by vertical subsampling. It should thus make
271 * sense when multiplied by a multiple of vertical subsampling.
272 */
273uint64
274TIFFScanlineSize64(TIFF* tif)
275{
276 static const char module[] = "TIFFScanlineSize64";
277 TIFFDirectory *td = &tif->tif_dir;
278 uint64 scanline_size;
279 if (td->td_planarconfig==PLANARCONFIG_CONTIG)
280 {
281 if ((td->td_photometric==PHOTOMETRIC_YCBCR)&&
282 (td->td_samplesperpixel==3)&&
283 (!isUpSampled(tif)))
284 {
285 uint16 ycbcrsubsampling[2];
286 uint16 samplingblock_samples;
287 uint32 samplingblocks_hor;
288 uint64 samplingrow_samples;
289 uint64 samplingrow_size;
290 if(td->td_samplesperpixel!=3)
291 {
292 TIFFErrorExt(tif->tif_clientdata,module,
293 "Invalid td_samplesperpixel value");
294 return 0;
295 }
296 TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,
297 ycbcrsubsampling+0,
298 ycbcrsubsampling+1);
299 if (((ycbcrsubsampling[0]!=1)&&(ycbcrsubsampling[0]!=2)&&(ycbcrsubsampling[0]!=4)) ||
300 ((ycbcrsubsampling[1]!=1)&&(ycbcrsubsampling[1]!=2)&&(ycbcrsubsampling[1]!=4)))
301 {
302 TIFFErrorExt(tif->tif_clientdata,module,
303 "Invalid YCbCr subsampling");
304 return 0;
305 }
306 samplingblock_samples = ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;
307 samplingblocks_hor = TIFFhowmany_32(td->td_imagewidth,ycbcrsubsampling[0]);
308 samplingrow_samples = _TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);
309 samplingrow_size = TIFFhowmany_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module),8);
310 scanline_size = (samplingrow_size/ycbcrsubsampling[1]);
311 }
312 else
313 {
314 uint64 scanline_samples;
315 scanline_samples=_TIFFMultiply64(tif,td->td_imagewidth,td->td_samplesperpixel,module);
316 scanline_size=TIFFhowmany_64(_TIFFMultiply64(tif,scanline_samples,td->td_bitspersample,module),8);
317 }
318 }
319 else
320 scanline_size=TIFFhowmany_64(_TIFFMultiply64(tif,td->td_imagewidth,td->td_bitspersample,module),8);
321 return(scanline_size);
322}
323tmsize_t
324TIFFScanlineSize(TIFF* tif)
325{
326 static const char module[] = "TIFFScanlineSize";
327 uint64 m;
328 tmsize_t n;
329 m=TIFFScanlineSize64(tif);
330 n=(tmsize_t)m;
331 if ((uint64)n!=m)
332 {
333 TIFFErrorExt(tif->tif_clientdata,module,"Integer arithmetic overflow");
334 n=0;
335 }
336 return(n);
337}
338
339/*
340 * Return the number of bytes required to store a complete
341 * decoded and packed raster scanline (as opposed to the
342 * I/O size returned by TIFFScanlineSize which may be less
343 * if data is store as separate planes).
344 */
345uint64
346TIFFRasterScanlineSize64(TIFF* tif)
347{
348 static const char module[] = "TIFFRasterScanlineSize64";
349 TIFFDirectory *td = &tif->tif_dir;
350 uint64 scanline;
351
352 scanline = _TIFFMultiply64(tif, td->td_bitspersample, td->td_imagewidth, module);
353 if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
354 scanline = _TIFFMultiply64(tif, scanline, td->td_samplesperpixel, module);
355 return (TIFFhowmany8_64(scanline));
356 } else
357 return (_TIFFMultiply64(tif, TIFFhowmany8_64(scanline),
358 td->td_samplesperpixel, module));
359}
360tmsize_t
361TIFFRasterScanlineSize(TIFF* tif)
362{
363 static const char module[] = "TIFFRasterScanlineSize";
364 uint64 m;
365 tmsize_t n;
366 m=TIFFRasterScanlineSize64(tif);
367 n=(tmsize_t)m;
368 if ((uint64)n!=m)
369 {
370 TIFFErrorExt(tif->tif_clientdata,module,"Integer arithmetic overflow");
371 n=0;
372 }
373 return(n);
374}
375
376/* vim: set ts=8 sts=8 sw=8 noet: */
377/*
378 * Local Variables:
379 * mode: c
380 * c-basic-offset: 8
381 * fill-column: 78
382 * End:
383 */
384
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