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280 lines
7.7 KiB
C
280 lines
7.7 KiB
C
/* $Id: tif_tile.c,v 1.12.2.1 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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* Tiled 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, because 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 tile an (x,y,z,s) value is in.
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*/
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ttile_t
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TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t 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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ttile_t 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(td->td_imagewidth, dx);
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uint32 ypt = TIFFhowmany(td->td_imagelength, dy);
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uint32 zpt = TIFFhowmany(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, tsample_t 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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ttile_t
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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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ttile_t 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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multiply(tif, multiply(tif, TIFFhowmany(td->td_imagewidth, dx),
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TIFFhowmany(td->td_imagelength, dy),
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"TIFFNumberOfTiles"),
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TIFFhowmany(td->td_imagedepth, dz), "TIFFNumberOfTiles");
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if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
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ntiles = multiply(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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tsize_t
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TIFFTileRowSize(TIFF* tif)
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{
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TIFFDirectory *td = &tif->tif_dir;
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tsize_t rowsize;
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if (td->td_tilelength == 0 || td->td_tilewidth == 0)
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return ((tsize_t) 0);
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rowsize = multiply(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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rowsize = multiply(tif, rowsize, td->td_samplesperpixel,
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"TIFFTileRowSize");
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return ((tsize_t) TIFFhowmany8(rowsize));
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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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tsize_t
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TIFFVTileSize(TIFF* tif, uint32 nrows)
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{
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TIFFDirectory *td = &tif->tif_dir;
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tsize_t tilesize;
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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 ((tsize_t) 0);
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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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tsize_t w =
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TIFFroundup(td->td_tilewidth, td->td_ycbcrsubsampling[0]);
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tsize_t rowsize =
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TIFFhowmany8(multiply(tif, w, td->td_bitspersample,
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"TIFFVTileSize"));
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tsize_t samplingarea =
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td->td_ycbcrsubsampling[0]*td->td_ycbcrsubsampling[1];
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if (samplingarea == 0) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Invalid YCbCr subsampling");
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return 0;
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}
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nrows = TIFFroundup(nrows, td->td_ycbcrsubsampling[1]);
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/* NB: don't need TIFFhowmany here 'cuz everything is rounded */
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tilesize = multiply(tif, nrows, rowsize, "TIFFVTileSize");
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tilesize = summarize(tif, tilesize,
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multiply(tif, 2, tilesize / samplingarea,
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"TIFFVTileSize"),
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"TIFFVTileSize");
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} else
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tilesize = multiply(tif, nrows, TIFFTileRowSize(tif),
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"TIFFVTileSize");
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return ((tsize_t)
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multiply(tif, tilesize, td->td_tiledepth, "TIFFVTileSize"));
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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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tsize_t
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TIFFTileSize(TIFF* tif)
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{
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return (TIFFVTileSize(tif, tif->tif_dir.td_tilelength));
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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(*tw, 16);
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if (*th & 0xf)
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*th = TIFFroundup(*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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