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- #ifndef lint
- static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_strip.c,v 1.3 91/08/19 14:40:47 sam Exp $";
- #endif
-
- /*
- * Copyright (c) 1991 Sam Leffler
- * Copyright (c) 1991 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.
- *
- * Strip-organized Image Support Routines.
- */
- #include "tiffioP.h"
-
- /*
- * Compute which strip a (row,sample) value is in.
- */
- u_int
- TIFFComputeStrip(tif, row, sample)
- TIFF *tif;
- u_long row;
- u_int sample;
- {
- TIFFDirectory *td = &tif->tif_dir;
- u_int strip;
-
- strip = row / td->td_rowsperstrip;
- if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
- if (sample >= td->td_samplesperpixel) {
- TIFFError(tif->tif_name,
- "%d: Sample out of range, max %d",
- sample, td->td_samplesperpixel);
- return (0);
- }
- strip += sample*td->td_stripsperimage;
- }
- return (strip);
- }
-
- /*
- * Compute how many strips are in an image.
- */
- u_int
- TIFFNumberOfStrips(tif)
- TIFF *tif;
- {
- TIFFDirectory *td = &tif->tif_dir;
-
- return (td->td_rowsperstrip == 0xffffffff ?
- (td->td_imagelength != 0 ? 1 : 0) :
- howmany(td->td_imagelength, td->td_rowsperstrip));
- }
-
- /*
- * Compute the # bytes in a (row-aligned) strip.
- */
- u_long
- TIFFStripSize(tif)
- TIFF *tif;
- {
- TIFFDirectory *td = &tif->tif_dir;
- u_long rowsperstrip = td->td_rowsperstrip;
-
- if (rowsperstrip == (u_long)-1)
- rowsperstrip = td->td_imagelength;
- return (rowsperstrip * TIFFScanlineSize(tif));
- }
-