1 /* PDFlib GmbH cvsid: $Id: tif_tile.c,v 1.12 2005/12/21 14:12:52 rjs 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 * Tiled Image Support Routines.
31 */
32 #include "tiffiop.h"
33
34 static uint32
summarize(TIFF * tif,size_t summand1,size_t summand2,const char * where)35 summarize(TIFF* tif, size_t summand1, size_t summand2, const char* where)
36 {
37 /*
38 * XXX: We are using casting to uint32 here, because 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 _TIFFError(tif, tif->tif_name, "Integer overflow in %s", where);
45 bytes = 0;
46 }
47
48 return (bytes);
49 }
50
51 static uint32
multiply(TIFF * tif,size_t nmemb,size_t elem_size,const char * where)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 _TIFFError(tif, tif->tif_name, "Integer overflow in %s", where);
58 bytes = 0;
59 }
60
61 return (bytes);
62 }
63
64 /*
65 * Compute which tile an (x,y,z,s) value is in.
66 */
67 ttile_t
TIFFComputeTile(TIFF * tif,uint32 x,uint32 y,uint32 z,tsample_t s)68 TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
69 {
70 TIFFDirectory *td = &tif->tif_dir;
71 uint32 dx = td->td_tilewidth;
72 uint32 dy = td->td_tilelength;
73 uint32 dz = td->td_tiledepth;
74 ttile_t tile = 1;
75
76 if (td->td_imagedepth == 1)
77 z = 0;
78 if (dx == (uint32) -1)
79 dx = td->td_imagewidth;
80 if (dy == (uint32) -1)
81 dy = td->td_imagelength;
82 if (dz == (uint32) -1)
83 dz = td->td_imagedepth;
84 if (dx != 0 && dy != 0 && dz != 0) {
85 uint32 xpt = TIFFhowmany(td->td_imagewidth, dx);
86 uint32 ypt = TIFFhowmany(td->td_imagelength, dy);
87 uint32 zpt = TIFFhowmany(td->td_imagedepth, dz);
88
89 if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
90 tile = (xpt*ypt*zpt)*s +
91 (xpt*ypt)*(z/dz) +
92 xpt*(y/dy) +
93 x/dx;
94 else
95 tile = (xpt*ypt)*(z/dz) + xpt*(y/dy) + x/dx;
96 }
97 return (tile);
98 }
99
100 /*
101 * Check an (x,y,z,s) coordinate
102 * against the image bounds.
103 */
104 int
TIFFCheckTile(TIFF * tif,uint32 x,uint32 y,uint32 z,tsample_t s)105 TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
106 {
107 TIFFDirectory *td = &tif->tif_dir;
108
109 if (x >= td->td_imagewidth) {
110 _TIFFError(tif, tif->tif_name, "%lu: Col out of range, max %lu",
111 (unsigned long) x, (unsigned long) td->td_imagewidth);
112 return (0);
113 }
114 if (y >= td->td_imagelength) {
115 _TIFFError(tif, tif->tif_name, "%lu: Row out of range, max %lu",
116 (unsigned long) y, (unsigned long) td->td_imagelength);
117 return (0);
118 }
119 if (z >= td->td_imagedepth) {
120 _TIFFError(tif,tif->tif_name,"%lu: Depth out of range, max %lu",
121 (unsigned long) z, (unsigned long) td->td_imagedepth);
122 return (0);
123 }
124 if (td->td_planarconfig == PLANARCONFIG_SEPARATE &&
125 s >= td->td_samplesperpixel) {
126 _TIFFError(tif, tif->tif_name,
127 "%lu: Sample out of range, max %lu",
128 (unsigned long) s, (unsigned long) td->td_samplesperpixel);
129 return (0);
130 }
131 return (1);
132 }
133
134 /*
135 * Compute how many tiles are in an image.
136 */
137 ttile_t
TIFFNumberOfTiles(TIFF * tif)138 TIFFNumberOfTiles(TIFF* tif)
139 {
140 TIFFDirectory *td = &tif->tif_dir;
141 uint32 dx = td->td_tilewidth;
142 uint32 dy = td->td_tilelength;
143 uint32 dz = td->td_tiledepth;
144 ttile_t ntiles;
145
146 if (dx == (uint32) -1)
147 dx = td->td_imagewidth;
148 if (dy == (uint32) -1)
149 dy = td->td_imagelength;
150 if (dz == (uint32) -1)
151 dz = td->td_imagedepth;
152 ntiles = (dx == 0 || dy == 0 || dz == 0) ? 0 :
153 multiply(tif, multiply(tif, TIFFhowmany(td->td_imagewidth, dx),
154 TIFFhowmany(td->td_imagelength, dy),
155 "TIFFNumberOfTiles"),
156 TIFFhowmany(td->td_imagedepth, dz), "TIFFNumberOfTiles");
157 if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
158 ntiles = multiply(tif, ntiles, td->td_samplesperpixel,
159 "TIFFNumberOfTiles");
160 return (ntiles);
161 }
162
163 /*
164 * Compute the # bytes in each row of a tile.
165 */
166 tsize_t
TIFFTileRowSize(TIFF * tif)167 TIFFTileRowSize(TIFF* tif)
168 {
169 TIFFDirectory *td = &tif->tif_dir;
170 tsize_t rowsize;
171
172 if (td->td_tilelength == 0 || td->td_tilewidth == 0)
173 return ((tsize_t) 0);
174 rowsize = multiply(tif, td->td_bitspersample, td->td_tilewidth,
175 "TIFFTileRowSize");
176 if (td->td_planarconfig == PLANARCONFIG_CONTIG)
177 rowsize = multiply(tif, rowsize, td->td_samplesperpixel,
178 "TIFFTileRowSize");
179 return ((tsize_t) TIFFhowmany8(rowsize));
180 }
181
182 /*
183 * Compute the # bytes in a variable length, row-aligned tile.
184 */
185 tsize_t
TIFFVTileSize(TIFF * tif,uint32 nrows)186 TIFFVTileSize(TIFF* tif, uint32 nrows)
187 {
188 TIFFDirectory *td = &tif->tif_dir;
189 tsize_t tilesize;
190
191 if (td->td_tilelength == 0 || td->td_tilewidth == 0 ||
192 td->td_tiledepth == 0)
193 return ((tsize_t) 0);
194 if (td->td_planarconfig == PLANARCONFIG_CONTIG &&
195 td->td_photometric == PHOTOMETRIC_YCBCR &&
196 !isUpSampled(tif)) {
197 /*
198 * Packed YCbCr data contain one Cb+Cr for every
199 * HorizontalSampling*VerticalSampling Y values.
200 * Must also roundup width and height when calculating
201 * since images that are not a multiple of the
202 * horizontal/vertical subsampling area include
203 * YCbCr data for the extended image.
204 */
205 tsize_t w =
206 TIFFroundup(td->td_tilewidth, td->td_ycbcrsubsampling[0]);
207 tsize_t rowsize =
208 TIFFhowmany8(multiply(tif, w, td->td_bitspersample,
209 "TIFFVTileSize"));
210 tsize_t samplingarea =
211 td->td_ycbcrsubsampling[0]*td->td_ycbcrsubsampling[1];
212 if (samplingarea == 0) {
213 _TIFFError(tif, tif->tif_name,
214 "Invalid YCbCr subsampling");
215 return 0;
216 }
217 nrows = TIFFroundup(nrows, td->td_ycbcrsubsampling[1]);
218 /* NB: don't need TIFFhowmany here 'cuz everything is rounded */
219 tilesize = multiply(tif, nrows, rowsize, "TIFFVTileSize");
220 tilesize = summarize(tif, tilesize,
221 multiply(tif, 2, tilesize / samplingarea,
222 "TIFFVTileSize"),
223 "TIFFVTileSize");
224 } else
225 tilesize = multiply(tif, nrows, TIFFTileRowSize(tif),
226 "TIFFVTileSize");
227 return ((tsize_t)
228 multiply(tif, tilesize, td->td_tiledepth, "TIFFVTileSize"));
229 }
230
231 /*
232 * Compute the # bytes in a row-aligned tile.
233 */
234 tsize_t
TIFFTileSize(TIFF * tif)235 TIFFTileSize(TIFF* tif)
236 {
237 return (TIFFVTileSize(tif, tif->tif_dir.td_tilelength));
238 }
239
240 /*
241 * Compute a default tile size based on the image
242 * characteristics and a requested value. If a
243 * request is <1 then we choose a size according
244 * to certain heuristics.
245 */
246 void
TIFFDefaultTileSize(TIFF * tif,uint32 * tw,uint32 * th)247 TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
248 {
249 (*tif->tif_deftilesize)(tif, tw, th);
250 }
251
252 void
_TIFFDefaultTileSize(TIFF * tif,uint32 * tw,uint32 * th)253 _TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
254 {
255 (void) tif;
256 if (*(int32*) tw < 1)
257 *tw = 256;
258 if (*(int32*) th < 1)
259 *th = 256;
260 /* roundup to a multiple of 16 per the spec */
261 if (*tw & 0xf)
262 *tw = TIFFroundup(*tw, 16);
263 if (*th & 0xf)
264 *th = TIFFroundup(*th, 16);
265 }
266
267 /* vim: set ts=8 sts=8 sw=8 noet: */
268