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370 lines
10 KiB
370 lines
10 KiB
/* $Id: tif_strip.c,v 1.19.2.1 2010-06-08 18:50:43 bfriesen 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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TIFFErrorExt(tif->tif_clientdata, 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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TIFFErrorExt(tif->tif_clientdata, 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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TIFFErrorExt(tif->tif_clientdata, 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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TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
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"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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TIFFErrorExt(tif->tif_clientdata, 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 |
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* STRIP_SIZE_DEFAULT bytes long. |
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*/ |
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tsize_t scanline = TIFFScanlineSize(tif); |
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s = (uint32)STRIP_SIZE_DEFAULT / (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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if (td->td_planarconfig == PLANARCONFIG_CONTIG) { |
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if (td->td_photometric == PHOTOMETRIC_YCBCR |
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&& !isUpSampled(tif)) { |
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uint16 ycbcrsubsampling[2]; |
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TIFFGetField(tif, TIFFTAG_YCBCRSUBSAMPLING, |
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ycbcrsubsampling + 0, |
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ycbcrsubsampling + 1); |
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if (ycbcrsubsampling[0] == 0) { |
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
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"Invalid YCbCr subsampling"); |
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return 0; |
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} |
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scanline = TIFFroundup(td->td_imagewidth, |
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ycbcrsubsampling[0]); |
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scanline = TIFFhowmany8(multiply(tif, scanline, |
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td->td_bitspersample, |
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"TIFFScanlineSize")); |
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return ((tsize_t) |
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summarize(tif, scanline, |
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multiply(tif, 2, |
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scanline / ycbcrsubsampling[0], |
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"TIFFVStripSize"), |
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"TIFFVStripSize")); |
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} else { |
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scanline = multiply(tif, td->td_imagewidth, |
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td->td_samplesperpixel, |
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"TIFFScanlineSize"); |
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} |
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} else |
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scanline = td->td_imagewidth; |
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return ((tsize_t) TIFFhowmany8(multiply(tif, scanline, |
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td->td_bitspersample, |
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"TIFFScanlineSize"))); |
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} |
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/* |
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* Some stuff depends on this older version of TIFFScanlineSize |
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* TODO: resolve this |
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*/ |
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tsize_t |
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TIFFOldScanlineSize(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 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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* The ScanlineSize in case of YCbCrSubsampling is defined as the |
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* strip size divided by the strip height, i.e. the size of a pack of vertical |
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* subsampling lines divided by vertical subsampling. It should thus make |
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* sense when multiplied by a multiple of vertical subsampling. |
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* Some stuff depends on this newer version of TIFFScanlineSize |
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* TODO: resolve this |
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*/ |
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tsize_t |
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TIFFNewScanlineSize(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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if (td->td_planarconfig == PLANARCONFIG_CONTIG) { |
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if (td->td_photometric == PHOTOMETRIC_YCBCR |
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&& !isUpSampled(tif)) { |
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uint16 ycbcrsubsampling[2]; |
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TIFFGetField(tif, TIFFTAG_YCBCRSUBSAMPLING, |
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ycbcrsubsampling + 0, |
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ycbcrsubsampling + 1); |
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if (ycbcrsubsampling[0]*ycbcrsubsampling[1] == 0) { |
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name, |
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"Invalid YCbCr subsampling"); |
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return 0; |
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} |
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return((tsize_t) ((((td->td_imagewidth+ycbcrsubsampling[0]-1) |
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/ycbcrsubsampling[0]) |
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*(ycbcrsubsampling[0]*ycbcrsubsampling[1]+2) |
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*td->td_bitspersample+7) |
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/8)/ycbcrsubsampling[1]); |
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} else { |
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scanline = multiply(tif, td->td_imagewidth, |
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td->td_samplesperpixel, |
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"TIFFScanlineSize"); |
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} |
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} else |
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scanline = td->td_imagewidth; |
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return ((tsize_t) TIFFhowmany8(multiply(tif, scanline, |
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td->td_bitspersample, |
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"TIFFScanlineSize"))); |
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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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/* |
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* Local Variables: |
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* mode: c |
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* c-basic-offset: 8 |
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* fill-column: 78 |
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* End: |
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*/
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