tifftile.3t

tiff文件开发库

.\" $Header: /cvsroot/osrs/libtiff/man/TIFFtile.3t,v 1.1.1.1 1999/07/27 21:50:27 mike Exp $
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.\" Copyright (c) 1988-1997 Sam Leffler
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.\"
.if n .po 0
.TH TIFFTILE 3T "February 14, 1992"
.SH NAME
TIFFTileSize,
TIFFTileRowSize,
TIFFVTileSize,
TIFFDefaultTileSize,
TIFFComputeTile,
TIFFCheckTile,
TIFFNumberOfTiles
\- tile-related utility routines
.SH SYNOPSIS
.nf
.B "#include <tiffio.h>"
.B "void TIFFDefaultTileSize(TIFF* tif, uint32* tw, uint32* th)"
.B "tsize_t TIFFTileSize(TIFF* tif)"
.B "tsize_t TIFFTileRowSize(TIFF* tif)"
.B "tsize_t TIFFVTileSize(TIFF* tif, uint32 nrows)"
.B "ttile_t TIFFComputeTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t sample)"
.B "int TIFFCheckTile(TIFF* tif, uint32 x, uint32 y, uint32 z, tsample_t sample)"
.B "ttile_t TIFFNumberOfTiles(TIFF* tif)"
.fi
.SH DESCRIPTION
.I TIFFDefaultTileSize
returns the pixel width and height of a reasonable-sized tile;
suitable for setting up the
.I TileWidth
and
.I TileLength
tags.
If the
.I tw
and
.I th
values passed in are non-zero, then they are adjusted to reflect
any compression-specific requirements.
The returned width and height are constrained to be a multiple
of 16 pixels to conform with the 
.SM TIFF
specification.
.PP
.I TIFFTileSize
returns the equivalent size for a tile of data as it would
be returned in a call to
.I TIFFReadTile
or as it would be expected in a call to
.IR TIFFWriteTile .
.PP
.I TIFFVTileSize
returns the number of bytes in a row-aligned tile with
.I nrows
of data.
.PP
.I TIFFTileRowSize
returns the number of bytes of a row of data in a tile.
.PP
.IR TIFFComputeTile
returns the tile that contains the specified coordinates.
A valid tile is always returned;
out-of-range coordinate values are clamped to the bounds of the image.
The
.I x
and
.I y
parameters are always used in calculating a tile.
The
.I z
parameter is used if the image is deeper than 1 slice (\c
.IR ImageDepth >1).
The
.I sample
parameter is used only if data are organized in separate planes (\c
.IR PlanarConfiguration =2).
.PP
.IR TIFFCheckTile
returns a non-zero value if the supplied coordinates are
within the bounds of the image and zero otherwise.
The
.I x
parameter is checked against the value of the
.I ImageWidth
tag.
The
.I y
parameter is checked against the value of the
.I ImageLength
tag.
The
.I z
parameter is checked against the value of the
.I ImageDepth
tag (if defined).
The
.I sample
parameter is checked against the value of the
.I SamplesPerPixel
parameter if the data are organized in separate planes.
.PP
.IR TIFFNumberOfTiles
returns the number of tiles in the image.
.SH DIAGNOSTICS
None.
.SH "SEE ALSO"
.IR libtiff (3T),
.IR TIFFReadEncodedTile (3T),
.IR TIFFReadRawTile (3T),
.IR TIFFReadTile (3T),
.IR TIFFWriteEncodedTile (3T),
.IR TIFFWriteRawTile (3T),
.IR TIFFWriteTile (3T)