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/* $Id: tif_tile.c,v 1.4 2010/01/26 15:56:36 scuri Exp $ */
/*
* Copyright (c) 1991-1997 Sam Leffler
* Copyright (c) 1991-1997 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.
*
* Tiled Image Support Routines.
*/
#include "tiffiop.h"
static uint32
summarize(TIFF* tif, size_t summand1, size_t summand2, const char* where)
{
/*
* XXX: We are using casting to uint32 here, because sizeof(size_t)
* may be larger than sizeof(uint32) on 64-bit architectures.
*/
uint32 bytes = summand1 + summand2;
if (bytes - summand1 != summand2) {
TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Integer overflow in %s", where);
bytes = 0;
}
return (bytes);
}
static uint32
multiply(TIFF* tif, size_t nmemb, size_t elem_size, const char* where)
{
uint32 bytes = nmemb * elem_size;
if (elem_size && bytes / elem_size != nmemb) {
TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Integer overflow in %s", where);
bytes = 0;
}
return (bytes);
}
/*
* Compute which tile an (x,y,z,s) value is in.
*/
ttile_t
TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
{
TIFFDirectory *td = &tif->tif_dir;
uint32 dx = td->td_tilewidth;
uint32 dy = td->td_tilelength;
uint32 dz = td->td_tiledepth;
ttile_t tile = 1;
if (td->td_imagedepth == 1)
z = 0;
if (dx == (uint32) -1)
dx = td->td_imagewidth;
if (dy == (uint32) -1)
dy = td->td_imagelength;
if (dz == (uint32) -1)
dz = td->td_imagedepth;
if (dx != 0 && dy != 0 && dz != 0) {
uint32 xpt = TIFFhowmany(td->td_imagewidth, dx);
uint32 ypt = TIFFhowmany(td->td_imagelength, dy);
uint32 zpt = TIFFhowmany(td->td_imagedepth, dz);
if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
tile = (xpt*ypt*zpt)*s +
(xpt*ypt)*(z/dz) +
xpt*(y/dy) +
x/dx;
else
tile = (xpt*ypt)*(z/dz) + xpt*(y/dy) + x/dx;
}
return (tile);
}
/*
* Check an (x,y,z,s) coordinate
* against the image bounds.
*/
int
TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t s)
{
TIFFDirectory *td = &tif->tif_dir;
if (x >= td->td_imagewidth) {
TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
"%lu: Col out of range, max %lu",
(unsigned long) x,
(unsigned long) (td->td_imagewidth - 1));
return (0);
}
if (y >= td->td_imagelength) {
TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
"%lu: Row out of range, max %lu",
(unsigned long) y,
(unsigned long) (td->td_imagelength - 1));
return (0);
}
if (z >= td->td_imagedepth) {
TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
"%lu: Depth out of range, max %lu",
(unsigned long) z,
(unsigned long) (td->td_imagedepth - 1));
return (0);
}
if (td->td_planarconfig == PLANARCONFIG_SEPARATE &&
s >= td->td_samplesperpixel) {
TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
"%lu: Sample out of range, max %lu",
(unsigned long) s,
(unsigned long) (td->td_samplesperpixel - 1));
return (0);
}
return (1);
}
/*
* Compute how many tiles are in an image.
*/
ttile_t
TIFFNumberOfTiles(TIFF* tif)
{
TIFFDirectory *td = &tif->tif_dir;
uint32 dx = td->td_tilewidth;
uint32 dy = td->td_tilelength;
uint32 dz = td->td_tiledepth;
ttile_t ntiles;
if (dx == (uint32) -1)
dx = td->td_imagewidth;
if (dy == (uint32) -1)
dy = td->td_imagelength;
if (dz == (uint32) -1)
dz = td->td_imagedepth;
ntiles = (dx == 0 || dy == 0 || dz == 0) ? 0 :
multiply(tif, multiply(tif, TIFFhowmany(td->td_imagewidth, dx),
TIFFhowmany(td->td_imagelength, dy),
"TIFFNumberOfTiles"),
TIFFhowmany(td->td_imagedepth, dz), "TIFFNumberOfTiles");
if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
ntiles = multiply(tif, ntiles, td->td_samplesperpixel,
"TIFFNumberOfTiles");
return (ntiles);
}
/*
* Compute the # bytes in each row of a tile.
*/
tsize_t
TIFFTileRowSize(TIFF* tif)
{
TIFFDirectory *td = &tif->tif_dir;
tsize_t rowsize;
if (td->td_tilelength == 0 || td->td_tilewidth == 0)
return ((tsize_t) 0);
rowsize = multiply(tif, td->td_bitspersample, td->td_tilewidth,
"TIFFTileRowSize");
if (td->td_planarconfig == PLANARCONFIG_CONTIG)
rowsize = multiply(tif, rowsize, td->td_samplesperpixel,
"TIFFTileRowSize");
return ((tsize_t) TIFFhowmany8(rowsize));
}
/*
* Compute the # bytes in a variable length, row-aligned tile.
*/
tsize_t
TIFFVTileSize(TIFF* tif, uint32 nrows)
{
TIFFDirectory *td = &tif->tif_dir;
tsize_t tilesize;
if (td->td_tilelength == 0 || td->td_tilewidth == 0 ||
td->td_tiledepth == 0)
return ((tsize_t) 0);
if (td->td_planarconfig == PLANARCONFIG_CONTIG &&
td->td_photometric == PHOTOMETRIC_YCBCR &&
!isUpSampled(tif)) {
/*
* 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.
*/
tsize_t w =
TIFFroundup(td->td_tilewidth, td->td_ycbcrsubsampling[0]);
tsize_t rowsize =
TIFFhowmany8(multiply(tif, w, td->td_bitspersample,
"TIFFVTileSize"));
tsize_t samplingarea =
td->td_ycbcrsubsampling[0]*td->td_ycbcrsubsampling[1];
if (samplingarea == 0) {
TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Invalid YCbCr subsampling");
return 0;
}
nrows = TIFFroundup(nrows, td->td_ycbcrsubsampling[1]);
/* NB: don't need TIFFhowmany here 'cuz everything is rounded */
tilesize = multiply(tif, nrows, rowsize, "TIFFVTileSize");
tilesize = summarize(tif, tilesize,
multiply(tif, 2, tilesize / samplingarea,
"TIFFVTileSize"),
"TIFFVTileSize");
} else
tilesize = multiply(tif, nrows, TIFFTileRowSize(tif),
"TIFFVTileSize");
return ((tsize_t)
multiply(tif, tilesize, td->td_tiledepth, "TIFFVTileSize"));
}
/*
* Compute the # bytes in a row-aligned tile.
*/
tsize_t
TIFFTileSize(TIFF* tif)
{
return (TIFFVTileSize(tif, tif->tif_dir.td_tilelength));
}
/*
* Compute a default tile size based on the image
* characteristics and a requested value. If a
* request is <1 then we choose a size according
* to certain heuristics.
*/
void
TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
{
(*tif->tif_deftilesize)(tif, tw, th);
}
void
_TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)
{
(void) tif;
if (*(int32*) tw < 1)
*tw = 256;
if (*(int32*) th < 1)
*th = 256;
/* roundup to a multiple of 16 per the spec */
if (*tw & 0xf)
*tw = TIFFroundup(*tw, 16);
if (*th & 0xf)
*th = TIFFroundup(*th, 16);
}
/* vim: set ts=8 sts=8 sw=8 noet: */
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