| #ifndef lint |
| static char rcsid[] = "$Header: /cvs/bao-parsec/ext/splash2x/apps/volrend/src/libtiff/tif_strip.c,v 1.1.1.1 2012/03/29 17:22:43 uid42307 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 |
| 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 variable height, row-aligned strip. |
| */ |
| u_long |
| TIFFVStripSize(tif, nrows) |
| 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 |
| TIFFStripSize(tif) |
| TIFF *tif; |
| { |
| return (TIFFVStripSize(tif, tif->tif_dir.td_rowsperstrip)); |
| } |