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[wxWidgets.git] / src / tiff / tif_tile.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 * Tiled Image Support Routines.
31 */
32 #include "tiffiop.h"
33
34 /*
35 * Compute which tile an (x,y,z,s) value is in.
36 */
37 ttile_t
38 TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
39 {
40 TIFFDirectory *td = &tif->tif_dir;
41 uint32 dx = td->td_tilewidth;
42 uint32 dy = td->td_tilelength;
43 uint32 dz = td->td_tiledepth;
44 ttile_t tile = 1;
45
46 if (td->td_imagedepth == 1)
47 z = 0;
48 if (dx == (uint32) -1)
49 dx = td->td_imagewidth;
50 if (dy == (uint32) -1)
51 dy = td->td_imagelength;
52 if (dz == (uint32) -1)
53 dz = td->td_imagedepth;
54 if (dx != 0 && dy != 0 && dz != 0) {
55 uint32 xpt = TIFFhowmany(td->td_imagewidth, dx);
56 uint32 ypt = TIFFhowmany(td->td_imagelength, dy);
57 uint32 zpt = TIFFhowmany(td->td_imagedepth, dz);
58
59 if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
60 tile = (xpt*ypt*zpt)*s +
61 (xpt*ypt)*(z/dz) +
62 xpt*(y/dy) +
63 x/dx;
64 else
65 tile = (xpt*ypt)*(z/dz) + xpt*(y/dy) + x/dx + s;
66 }
67 return (tile);
68 }
69
70 /*
71 * Check an (x,y,z,s) coordinate
72 * against the image bounds.
73 */
74 int
75 TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
76 {
77 TIFFDirectory *td = &tif->tif_dir;
78
79 if (x >= td->td_imagewidth) {
80 TIFFError(tif->tif_name, "Col %ld out of range, max %lu",
81 (long) x, (u_long) td->td_imagewidth);
82 return (0);
83 }
84 if (y >= td->td_imagelength) {
85 TIFFError(tif->tif_name, "Row %ld out of range, max %lu",
86 (long) y, (u_long) td->td_imagelength);
87 return (0);
88 }
89 if (z >= td->td_imagedepth) {
90 TIFFError(tif->tif_name, "Depth %ld out of range, max %lu",
91 (long) z, (u_long) td->td_imagedepth);
92 return (0);
93 }
94 if (td->td_planarconfig == PLANARCONFIG_SEPARATE &&
95 s >= td->td_samplesperpixel) {
96 TIFFError(tif->tif_name, "Sample %d out of range, max %u",
97 (int) s, td->td_samplesperpixel);
98 return (0);
99 }
100 return (1);
101 }
102
103 /*
104 * Compute how many tiles are in an image.
105 */
106 ttile_t
107 TIFFNumberOfTiles(TIFF* tif)
108 {
109 TIFFDirectory *td = &tif->tif_dir;
110 uint32 dx = td->td_tilewidth;
111 uint32 dy = td->td_tilelength;
112 uint32 dz = td->td_tiledepth;
113 ttile_t ntiles;
114
115 if (dx == (uint32) -1)
116 dx = td->td_imagewidth;
117 if (dy == (uint32) -1)
118 dy = td->td_imagelength;
119 if (dz == (uint32) -1)
120 dz = td->td_imagedepth;
121 ntiles = (dx == 0 || dy == 0 || dz == 0) ? 0 :
122 (TIFFhowmany(td->td_imagewidth, dx) *
123 TIFFhowmany(td->td_imagelength, dy) *
124 TIFFhowmany(td->td_imagedepth, dz));
125 if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
126 ntiles *= td->td_samplesperpixel;
127 return (ntiles);
128 }
129
130 /*
131 * Compute the # bytes in each row of a tile.
132 */
133 tsize_t
134 TIFFTileRowSize(TIFF* tif)
135 {
136 TIFFDirectory *td = &tif->tif_dir;
137 tsize_t rowsize;
138
139 if (td->td_tilelength == 0 || td->td_tilewidth == 0)
140 return ((tsize_t) 0);
141 rowsize = td->td_bitspersample * td->td_tilewidth;
142 if (td->td_planarconfig == PLANARCONFIG_CONTIG)
143 rowsize *= td->td_samplesperpixel;
144 return ((tsize_t) TIFFhowmany(rowsize, 8));
145 }
146
147 /*
148 * Compute the # bytes in a variable length, row-aligned tile.
149 */
150 tsize_t
151 TIFFVTileSize(TIFF* tif, uint32 nrows)
152 {
153 TIFFDirectory *td = &tif->tif_dir;
154 tsize_t tilesize;
155
156 if (td->td_tilelength == 0 || td->td_tilewidth == 0 ||
157 td->td_tiledepth == 0)
158 return ((tsize_t) 0);
159 #ifdef YCBCR_SUPPORT
160 if (td->td_planarconfig == PLANARCONFIG_CONTIG &&
161 td->td_photometric == PHOTOMETRIC_YCBCR &&
162 !isUpSampled(tif)) {
163 /*
164 * Packed YCbCr data contain one Cb+Cr for every
165 * HorizontalSampling*VerticalSampling Y values.
166 * Must also roundup width and height when calculating
167 * since images that are not a multiple of the
168 * horizontal/vertical subsampling area include
169 * YCbCr data for the extended image.
170 */
171 tsize_t w =
172 TIFFroundup(td->td_tilewidth, td->td_ycbcrsubsampling[0]);
173 tsize_t rowsize = TIFFhowmany(w*td->td_bitspersample, 8);
174 tsize_t samplingarea =
175 td->td_ycbcrsubsampling[0]*td->td_ycbcrsubsampling[1];
176 nrows = TIFFroundup(nrows, td->td_ycbcrsubsampling[1]);
177 /* NB: don't need TIFFhowmany here 'cuz everything is rounded */
178 tilesize = nrows*rowsize + 2*(nrows*rowsize / samplingarea);
179 } else
180 #endif
181 tilesize = nrows * TIFFTileRowSize(tif);
182 return ((tsize_t)(tilesize * td->td_tiledepth));
183 }
184
185 /*
186 * Compute the # bytes in a row-aligned tile.
187 */
188 tsize_t
189 TIFFTileSize(TIFF* tif)
190 {
191 return (TIFFVTileSize(tif, tif->tif_dir.td_tilelength));
192 }
193
194 /*
195 * Compute a default tile size based on the image
196 * characteristics and a requested value. If a
197 * request is <1 then we choose a size according
198 * to certain heuristics.
199 */
200 void
201 TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
202 {
203 (*tif->tif_deftilesize)(tif, tw, th);
204 }
205
206 void
207 _TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
208 {
209 (void) tif;
210 if (*(int32*) tw < 1)
211 *tw = 256;
212 if (*(int32*) th < 1)
213 *th = 256;
214 /* roundup to a multiple of 16 per the spec */
215 if (*tw & 0xf)
216 *tw = TIFFroundup(*tw, 16);
217 if (*th & 0xf)
218 *th = TIFFroundup(*th, 16);
219 }