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300 lines
8.5 KiB
300 lines
8.5 KiB
/*
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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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* Tiled Image Support Routines.
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*/
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#include "tiffiop.h"
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/*
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* Compute which tile an (x,y,z,s) value is in.
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*/
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uint32
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TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, uint16 s)
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{
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TIFFDirectory *td = &tif->tif_dir;
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uint32 dx = td->td_tilewidth;
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uint32 dy = td->td_tilelength;
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uint32 dz = td->td_tiledepth;
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uint32 tile = 1;
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if (td->td_imagedepth == 1)
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z = 0;
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if (dx == (uint32) -1)
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dx = td->td_imagewidth;
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if (dy == (uint32) -1)
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dy = td->td_imagelength;
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if (dz == (uint32) -1)
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dz = td->td_imagedepth;
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if (dx != 0 && dy != 0 && dz != 0) {
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uint32 xpt = TIFFhowmany_32(td->td_imagewidth, dx);
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uint32 ypt = TIFFhowmany_32(td->td_imagelength, dy);
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uint32 zpt = TIFFhowmany_32(td->td_imagedepth, dz);
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
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tile = (xpt*ypt*zpt)*s +
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(xpt*ypt)*(z/dz) +
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xpt*(y/dy) +
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x/dx;
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else
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tile = (xpt*ypt)*(z/dz) + xpt*(y/dy) + x/dx;
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}
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return (tile);
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}
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/*
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* Check an (x,y,z,s) coordinate
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* against the image bounds.
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*/
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int
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TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, uint16 s)
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{
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TIFFDirectory *td = &tif->tif_dir;
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if (x >= td->td_imagewidth) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%lu: Col out of range, max %lu",
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(unsigned long) x,
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(unsigned long) (td->td_imagewidth - 1));
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return (0);
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}
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if (y >= td->td_imagelength) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%lu: Row out of range, max %lu",
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(unsigned long) y,
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(unsigned long) (td->td_imagelength - 1));
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return (0);
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}
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if (z >= td->td_imagedepth) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"%lu: Depth out of range, max %lu",
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(unsigned long) z,
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(unsigned long) (td->td_imagedepth - 1));
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return (0);
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}
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE &&
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s >= 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) s,
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(unsigned long) (td->td_samplesperpixel - 1));
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return (0);
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}
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return (1);
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}
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/*
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* Compute how many tiles are in an image.
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*/
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uint32
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TIFFNumberOfTiles(TIFF* tif)
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{
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TIFFDirectory *td = &tif->tif_dir;
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uint32 dx = td->td_tilewidth;
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uint32 dy = td->td_tilelength;
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uint32 dz = td->td_tiledepth;
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uint32 ntiles;
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if (dx == (uint32) -1)
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dx = td->td_imagewidth;
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if (dy == (uint32) -1)
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dy = td->td_imagelength;
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if (dz == (uint32) -1)
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dz = td->td_imagedepth;
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ntiles = (dx == 0 || dy == 0 || dz == 0) ? 0 :
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_TIFFMultiply32(tif, _TIFFMultiply32(tif, TIFFhowmany_32(td->td_imagewidth, dx),
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TIFFhowmany_32(td->td_imagelength, dy),
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"TIFFNumberOfTiles"),
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TIFFhowmany_32(td->td_imagedepth, dz), "TIFFNumberOfTiles");
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
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ntiles = _TIFFMultiply32(tif, ntiles, td->td_samplesperpixel,
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"TIFFNumberOfTiles");
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return (ntiles);
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}
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/*
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* Compute the # bytes in each row of a tile.
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*/
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uint64
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TIFFTileRowSize64(TIFF* tif)
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{
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static const char module[] = "TIFFTileRowSize64";
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TIFFDirectory *td = &tif->tif_dir;
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uint64 rowsize;
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uint64 tilerowsize;
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if (td->td_tilelength == 0)
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{
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TIFFErrorExt(tif->tif_clientdata,module,"Tile length is zero");
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return 0;
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}
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if (td->td_tilewidth == 0)
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{
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TIFFErrorExt(tif->tif_clientdata,module,"Tile width is zero");
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return (0);
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}
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rowsize = _TIFFMultiply64(tif, td->td_bitspersample, td->td_tilewidth,
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"TIFFTileRowSize");
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if (td->td_planarconfig == PLANARCONFIG_CONTIG)
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{
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if (td->td_samplesperpixel == 0)
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{
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TIFFErrorExt(tif->tif_clientdata,module,"Samples per pixel is zero");
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return 0;
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}
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rowsize = _TIFFMultiply64(tif, rowsize, td->td_samplesperpixel,
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"TIFFTileRowSize");
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}
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tilerowsize=TIFFhowmany8_64(rowsize);
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if (tilerowsize == 0)
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{
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TIFFErrorExt(tif->tif_clientdata,module,"Computed tile row size is zero");
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return 0;
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}
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return (tilerowsize);
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}
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tmsize_t
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TIFFTileRowSize(TIFF* tif)
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{
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static const char module[] = "TIFFTileRowSize";
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uint64 m;
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m=TIFFTileRowSize64(tif);
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return _TIFFCastUInt64ToSSize(tif, m, module);
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}
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/*
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* Compute the # bytes in a variable length, row-aligned tile.
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*/
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uint64
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TIFFVTileSize64(TIFF* tif, uint32 nrows)
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{
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static const char module[] = "TIFFVTileSize64";
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TIFFDirectory *td = &tif->tif_dir;
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if (td->td_tilelength == 0 || td->td_tilewidth == 0 ||
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td->td_tiledepth == 0)
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return (0);
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if ((td->td_planarconfig==PLANARCONFIG_CONTIG)&&
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(td->td_photometric==PHOTOMETRIC_YCBCR)&&
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(td->td_samplesperpixel==3)&&
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(!isUpSampled(tif)))
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{
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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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uint16 samplingblock_samples;
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uint32 samplingblocks_hor;
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uint32 samplingblocks_ver;
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uint64 samplingrow_samples;
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uint64 samplingrow_size;
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TIFFGetFieldDefaulted(tif,TIFFTAG_YCBCRSUBSAMPLING,ycbcrsubsampling+0,
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ycbcrsubsampling+1);
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if ((ycbcrsubsampling[0] != 1 && ycbcrsubsampling[0] != 2 && ycbcrsubsampling[0] != 4)
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||(ycbcrsubsampling[1] != 1 && ycbcrsubsampling[1] != 2 && ycbcrsubsampling[1] != 4))
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{
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TIFFErrorExt(tif->tif_clientdata,module,
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"Invalid YCbCr subsampling (%dx%d)",
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ycbcrsubsampling[0],
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ycbcrsubsampling[1] );
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return 0;
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}
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samplingblock_samples=ycbcrsubsampling[0]*ycbcrsubsampling[1]+2;
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samplingblocks_hor=TIFFhowmany_32(td->td_tilewidth,ycbcrsubsampling[0]);
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samplingblocks_ver=TIFFhowmany_32(nrows,ycbcrsubsampling[1]);
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samplingrow_samples=_TIFFMultiply64(tif,samplingblocks_hor,samplingblock_samples,module);
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samplingrow_size=TIFFhowmany8_64(_TIFFMultiply64(tif,samplingrow_samples,td->td_bitspersample,module));
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return(_TIFFMultiply64(tif,samplingrow_size,samplingblocks_ver,module));
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}
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else
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return(_TIFFMultiply64(tif,nrows,TIFFTileRowSize64(tif),module));
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}
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tmsize_t
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TIFFVTileSize(TIFF* tif, uint32 nrows)
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{
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static const char module[] = "TIFFVTileSize";
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uint64 m;
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m=TIFFVTileSize64(tif,nrows);
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return _TIFFCastUInt64ToSSize(tif, m, module);
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}
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/*
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* Compute the # bytes in a row-aligned tile.
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*/
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uint64
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TIFFTileSize64(TIFF* tif)
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{
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return (TIFFVTileSize64(tif, tif->tif_dir.td_tilelength));
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}
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tmsize_t
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TIFFTileSize(TIFF* tif)
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{
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static const char module[] = "TIFFTileSize";
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uint64 m;
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m=TIFFTileSize64(tif);
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return _TIFFCastUInt64ToSSize(tif, m, module);
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}
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/*
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* Compute a default tile size based on the image
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* characteristics and a requested value. If a
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* request is <1 then we choose a size according
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* to certain heuristics.
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*/
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void
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TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
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{
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(*tif->tif_deftilesize)(tif, tw, th);
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}
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void
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_TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
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{
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(void) tif;
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if (*(int32*) tw < 1)
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*tw = 256;
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if (*(int32*) th < 1)
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*th = 256;
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/* roundup to a multiple of 16 per the spec */
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if (*tw & 0xf)
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*tw = TIFFroundup_32(*tw, 16);
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if (*th & 0xf)
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*th = TIFFroundup_32(*th, 16);
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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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