home *** CD-ROM | disk | FTP | other *** search
- #ifndef lint
- static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_tile.c,v 1.15 93/08/26 14:27:29 sam Exp $";
- #endif
-
- /*
- * Copyright (c) 1991, 1992 Sam Leffler
- * Copyright (c) 1991, 1992 Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the names of
- * Sam Leffler and Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Sam Leffler and Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- *
- * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
-
- /*
- * TIFF Library.
- *
- * Tiled Image Support Routines.
- */
- #include "tiffiop.h"
-
- /*
- * Compute which tile an (x,y,z,s) value is in.
- */
- ttile_t
- TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
- {
- TIFFDirectory *td = &tif->tif_dir;
- u_long dx = td->td_tilewidth;
- u_long dy = td->td_tilelength;
- u_long dz = td->td_tiledepth;
- ttile_t tile = 1;
-
- if (td->td_imagedepth == 1)
- z = 0;
- if (dx == (u_long) -1)
- dx = td->td_imagewidth;
- if (dy == (u_long) -1)
- dy = td->td_imagelength;
- if (dz == (u_long) -1)
- dz = td->td_imagedepth;
- if (dx != 0 && dy != 0 && dz != 0) {
- u_long xpt = howmany(td->td_imagewidth, dx);
- u_long ypt = howmany(td->td_imagelength, dy);
- u_long zpt = howmany(td->td_imagedepth, dz);
-
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
- tile = (xpt*ypt*zpt)*s +
- (xpt*ypt)*(z/dz) +
- xpt*(y/dy) +
- x/dx;
- else
- tile = (xpt*ypt)*(z/dz) + xpt*(y/dy) + x/dx + s;
- }
- return (tile);
- }
-
- /*
- * Check an (x,y,z,s) coordinate
- * against the image bounds.
- */
- TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
- {
- TIFFDirectory *td = &tif->tif_dir;
-
- if (x >= td->td_imagewidth) {
- TIFFError(tif->tif_name, "Col %ld out of range, max %lu",
- (long) x, (u_long) td->td_imagewidth);
- return (0);
- }
- if (y >= td->td_imagelength) {
- TIFFError(tif->tif_name, "Row %ld out of range, max %lu",
- (long) y, (u_long) td->td_imagelength);
- return (0);
- }
- if (z >= td->td_imagedepth) {
- TIFFError(tif->tif_name, "Depth %ld out of range, max %lu",
- (long) z, (u_long) td->td_imagedepth);
- return (0);
- }
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE &&
- s >= td->td_samplesperpixel) {
- TIFFError(tif->tif_name, "Sample %d out of range, max %u",
- (int) s, td->td_samplesperpixel);
- return (0);
- }
- return (1);
- }
-
- /*
- * Compute how many tiles are in an image.
- */
- ttile_t
- TIFFNumberOfTiles(TIFF* tif)
- {
- TIFFDirectory *td = &tif->tif_dir;
- u_long dx = td->td_tilewidth;
- u_long dy = td->td_tilelength;
- u_long dz = td->td_tiledepth;
- ttile_t ntiles;
-
- if (dx == (u_long) -1)
- dx = td->td_imagewidth;
- if (dy == (u_long) -1)
- dy = td->td_imagelength;
- if (dz == (u_long) -1)
- dz = td->td_imagedepth;
- ntiles = (dx != 0 && dy != 0 && dz != 0) ?
- (howmany(td->td_imagewidth, dx) * howmany(td->td_imagelength, dy) *
- howmany(td->td_imagedepth, dz)) :
- 0;
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
- ntiles *= td->td_samplesperpixel;
- return (ntiles);
- }
-
- /*
- * Compute the # bytes in each row of a tile.
- */
- tsize_t
- TIFFTileRowSize(TIFF* tif)
- {
- TIFFDirectory *td = &tif->tif_dir;
- tsize_t rowsize;
-
- if (td->td_tilelength == 0 || td->td_tilewidth == 0)
- return ((tsize_t) 0);
- rowsize = td->td_bitspersample * td->td_tilewidth;
- if (td->td_planarconfig == PLANARCONFIG_CONTIG)
- rowsize *= td->td_samplesperpixel;
- return (howmany(rowsize, 8));
- }
-
- /*
- * Compute the # bytes in a variable length, row-aligned tile.
- */
- tsize_t
- TIFFVTileSize(TIFF* tif, uint32 nrows)
- {
- TIFFDirectory *td = &tif->tif_dir;
- tsize_t tilesize;
-
- if (td->td_tilelength == 0 || td->td_tilewidth == 0 ||
- td->td_tiledepth == 0)
- return ((tsize_t) 0);
- #ifdef YCBCR_SUPPORT
- if (td->td_planarconfig == PLANARCONFIG_CONTIG &&
- td->td_photometric == PHOTOMETRIC_YCBCR) {
- /*
- * Packed YCbCr data contain one Cb+Cr for every
- * HorizontalSampling*VerticalSampling Y values.
- * Must also roundup width and height when calculating
- * since images that are not a multiple of the
- * horizontal/vertical subsampling area include
- * YCbCr data for the extended image.
- */
- tsize_t w =
- roundup(td->td_tilewidth, td->td_ycbcrsubsampling[0]);
- tsize_t rowsize = howmany(w*td->td_bitspersample, 8);
- tsize_t samplingarea =
- td->td_ycbcrsubsampling[0]*td->td_ycbcrsubsampling[1];
- nrows = roundup(nrows, td->td_ycbcrsubsampling[1]);
- /* NB: don't need howmany here 'cuz everything is rounded */
- tilesize = nrows*rowsize + 2*(nrows*rowsize / samplingarea);
- } else
- #endif
- tilesize = nrows * TIFFTileRowSize(tif);
- return (tilesize * td->td_tiledepth);
- }
-
- /*
- * Compute the # bytes in a row-aligned tile.
- */
- tsize_t
- TIFFTileSize(TIFF* tif)
- {
- return (TIFFVTileSize(tif, tif->tif_dir.td_tilelength));
- }
-