263 lines
7.4 KiB
C
263 lines
7.4 KiB
C
/* $Id: tif_strip.c,v 1.1 2005-06-17 13:54:52 vp153 Exp $ */
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/*
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* Copyright (c) 1991-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library.
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*
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* Strip-organized Image Support Routines.
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*/
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#include "tiffiop.h"
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static uint32
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summarize(TIFF* tif, size_t summand1, size_t summand2, const char* where)
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{
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/*
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* XXX: We are using casting to uint32 here, bacause sizeof(size_t)
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* may be larger than sizeof(uint32) on 64-bit architectures.
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*/
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uint32 bytes = summand1 + summand2;
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if (bytes - summand1 != summand2) {
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TIFFError(tif->tif_name, "Integer overflow in %s", where);
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bytes = 0;
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}
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return (bytes);
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}
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static uint32
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multiply(TIFF* tif, size_t nmemb, size_t elem_size, const char* where)
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{
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uint32 bytes = nmemb * elem_size;
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if (elem_size && bytes / elem_size != nmemb) {
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TIFFError(tif->tif_name, "Integer overflow in %s", where);
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bytes = 0;
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}
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return (bytes);
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}
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/*
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* Compute which strip a (row,sample) value is in.
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*/
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tstrip_t
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TIFFComputeStrip(TIFF* tif, uint32 row, tsample_t sample)
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{
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TIFFDirectory *td = &tif->tif_dir;
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tstrip_t strip;
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strip = row / td->td_rowsperstrip;
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
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if (sample >= td->td_samplesperpixel) {
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TIFFError(tif->tif_name,
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"%lu: Sample out of range, max %lu",
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(unsigned long) sample, (unsigned long) td->td_samplesperpixel);
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return ((tstrip_t) 0);
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}
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strip += sample*td->td_stripsperimage;
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}
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return (strip);
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}
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/*
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* Compute how many strips are in an image.
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*/
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tstrip_t
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TIFFNumberOfStrips(TIFF* tif)
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{
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TIFFDirectory *td = &tif->tif_dir;
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tstrip_t nstrips;
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nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 :
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TIFFhowmany(td->td_imagelength, td->td_rowsperstrip));
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
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nstrips = multiply(tif, nstrips, td->td_samplesperpixel,
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"TIFFNumberOfStrips");
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return (nstrips);
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}
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/*
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* Compute the # bytes in a variable height, row-aligned strip.
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*/
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tsize_t
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TIFFVStripSize(TIFF* tif, uint32 nrows)
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{
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TIFFDirectory *td = &tif->tif_dir;
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if (nrows == (uint32) -1)
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nrows = td->td_imagelength;
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if (td->td_planarconfig == PLANARCONFIG_CONTIG &&
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td->td_photometric == PHOTOMETRIC_YCBCR &&
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!isUpSampled(tif)) {
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/*
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* Packed YCbCr data contain one Cb+Cr for every
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* HorizontalSampling*VerticalSampling Y values.
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* Must also roundup width and height when calculating
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* since images that are not a multiple of the
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* horizontal/vertical subsampling area include
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* YCbCr data for the extended image.
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*/
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uint16 ycbcrsubsampling[2];
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tsize_t w, scanline, samplingarea;
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TIFFGetField( tif, TIFFTAG_YCBCRSUBSAMPLING,
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ycbcrsubsampling + 0,
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ycbcrsubsampling + 1 );
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samplingarea = ycbcrsubsampling[0]*ycbcrsubsampling[1];
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if (samplingarea == 0) {
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TIFFError(tif->tif_name, "Invalid YCbCr subsampling");
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return 0;
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}
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w = TIFFroundup(td->td_imagewidth, ycbcrsubsampling[0]);
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scanline = TIFFhowmany8(multiply(tif, w, td->td_bitspersample,
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"TIFFVStripSize"));
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nrows = TIFFroundup(nrows, ycbcrsubsampling[1]);
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/* NB: don't need TIFFhowmany here 'cuz everything is rounded */
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scanline = multiply(tif, nrows, scanline, "TIFFVStripSize");
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return ((tsize_t)
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summarize(tif, scanline,
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multiply(tif, 2, scanline / samplingarea,
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"TIFFVStripSize"), "TIFFVStripSize"));
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} else
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return ((tsize_t) multiply(tif, nrows, TIFFScanlineSize(tif),
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"TIFFVStripSize"));
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}
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/*
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* Compute the # bytes in a raw strip.
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*/
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tsize_t
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TIFFRawStripSize(TIFF* tif, tstrip_t strip)
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{
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TIFFDirectory* td = &tif->tif_dir;
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tsize_t bytecount = td->td_stripbytecount[strip];
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if (bytecount <= 0) {
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TIFFError(tif->tif_name,
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"%lu: Invalid strip byte count, strip %lu",
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(unsigned long) bytecount, (unsigned long) strip);
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bytecount = (tsize_t) -1;
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}
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return bytecount;
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}
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/*
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* Compute the # bytes in a (row-aligned) strip.
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*
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* Note that if RowsPerStrip is larger than the
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* recorded ImageLength, then the strip size is
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* truncated to reflect the actual space required
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* to hold the strip.
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*/
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tsize_t
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TIFFStripSize(TIFF* tif)
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{
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TIFFDirectory* td = &tif->tif_dir;
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uint32 rps = td->td_rowsperstrip;
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if (rps > td->td_imagelength)
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rps = td->td_imagelength;
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return (TIFFVStripSize(tif, rps));
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}
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/*
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* Compute a default strip size based on the image
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* characteristics and a requested value. If the
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* request is <1 then we choose a strip size according
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* to certain heuristics.
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*/
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uint32
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TIFFDefaultStripSize(TIFF* tif, uint32 request)
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{
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return (*tif->tif_defstripsize)(tif, request);
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}
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uint32
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_TIFFDefaultStripSize(TIFF* tif, uint32 s)
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{
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if ((int32) s < 1) {
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/*
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* If RowsPerStrip is unspecified, try to break the
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* image up into strips that are approximately 8Kbytes.
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*/
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tsize_t scanline = TIFFScanlineSize(tif);
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s = (uint32)(8*1024) / (scanline == 0 ? 1 : scanline);
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if (s == 0) /* very wide images */
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s = 1;
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}
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return (s);
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}
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/*
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* Return the number of bytes to read/write in a call to
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* one of the scanline-oriented i/o routines. Note that
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* this number may be 1/samples-per-pixel if data is
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* stored as separate planes.
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*/
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tsize_t
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TIFFScanlineSize(TIFF* tif)
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{
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TIFFDirectory *td = &tif->tif_dir;
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tsize_t scanline;
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scanline = multiply (tif, td->td_bitspersample, td->td_imagewidth,
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"TIFFScanlineSize");
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if (td->td_planarconfig == PLANARCONFIG_CONTIG)
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scanline = multiply (tif, scanline, td->td_samplesperpixel,
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"TIFFScanlineSize");
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return ((tsize_t) TIFFhowmany8(scanline));
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}
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/*
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* Return the number of bytes required to store a complete
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* decoded and packed raster scanline (as opposed to the
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* I/O size returned by TIFFScanlineSize which may be less
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* if data is store as separate planes).
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*/
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tsize_t
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TIFFRasterScanlineSize(TIFF* tif)
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{
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TIFFDirectory *td = &tif->tif_dir;
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tsize_t scanline;
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scanline = multiply (tif, td->td_bitspersample, td->td_imagewidth,
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"TIFFRasterScanlineSize");
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if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
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scanline = multiply (tif, scanline, td->td_samplesperpixel,
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"TIFFRasterScanlineSize");
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return ((tsize_t) TIFFhowmany8(scanline));
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} else
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return ((tsize_t) multiply (tif, TIFFhowmany8(scanline),
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td->td_samplesperpixel,
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"TIFFRasterScanlineSize"));
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}
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/* vim: set ts=8 sts=8 sw=8 noet: */
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