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#ifndef lint
static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_strip.c,v 1.9 92/10/21 13:42:18 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.
*
* Strip-organized Image Support Routines.
*/
#include "tiffiop.h"
/*
* Compute which strip a (row,sample) value is in.
*/
u_int
DECLARE3(TIFFComputeStrip, 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
DECLARE1(TIFFNumberOfStrips, 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 variable height, row-aligned strip.
*/
u_long
DECLARE2(TIFFVStripSize, TIFF*, tif, u_long, nrows)
{
TIFFDirectory *td = &tif->tif_dir;
if (nrows == (u_long)-1)
nrows = td->td_imagelength;
#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.
*/
u_long w =
roundup(td->td_imagewidth, td->td_ycbcrsubsampling[0]);
u_long scanline = howmany(w*td->td_bitspersample, 8);
u_long 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 */
return (nrows*scanline + 2*(nrows*scanline / samplingarea));
} else
#endif
return (nrows * TIFFScanlineSize(tif));
}
/*
* Compute the # bytes in a (row-aligned) strip.
*/
u_long
DECLARE1(TIFFStripSize, TIFF*, tif)
{
return (TIFFVStripSize(tif, tif->tif_dir.td_rowsperstrip));
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.