tiffstrip.3t

tiff文件开发库

.\" $Header: /cvsroot/osrs/libtiff/man/TIFFstrip.3t,v 1.2 2003/11/07 11:25:32 dron Exp $
.\"
.\" Copyright (c) 1992-1997 Sam Leffler
.\" Copyright (c) 1992-1997 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
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.\" permission of Sam Leffler and Silicon Graphics.
.\" 
.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
.\" 
.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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.\" 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 
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.\" OF THIS SOFTWARE.
.\"
.if n .po 0
.TH TIFFSTRIP 3T "October 15, 1995"
.SH NAME
TIFFDefaultStripSize,
TIFFStripSize,
TIFFVStripSize,
TIFFRawStripSize,
TIFFComputeStrip,
TIFFNumberOfStrips
\- strip-related utility routines
.SH SYNOPSIS
.nf
.B "#include <tiffio.h>"
.B "uint32 TIFFDefaultStripSize(TIFF* tif, uint32 estimate)"
.B "tsize_t TIFFStripSize(TIFF* tif)"
.B "tsize_t TIFFVStripSize(TIFF* tif, uint32 nrows)"
.B "tsize_t TIFFRawStripSize(TIFF* tif, tstrip_t strip)"
.B "tstrip_t TIFFComputeStrip(TIFF* tif, uint32 row, tsample_t sample)"
.B "tstrip_t TIFFNumberOfStrips(TIFF* tif)"
.fi
.SH DESCRIPTION
.I TIFFDefaultStripSize
returns the number of rows for a reasonable-sized strip according
to the current settings of the
.IR ImageWidth ,
.IR BitsPerSample ,
.IR SamplesPerPixel ,
tags and any compression-specific requirements.
If the
.I estimate
parameter, if non-zero, then it is taken as an estimate of the desired
strip size and adjusted according to any compression-specific requirements.
The value returned by this function is typically used to define the
.I RowsPerStrip
tag.
In lieu of any unusual requirements
.I TIFFDefaultStripSize
tries to create strips that have approximately
8 kilobytes of uncompressed data.
.PP
.IR TIFFStripSize
returns the equivalent size for a strip of data as it would
be returned in a call to
.IR TIFFReadEncodedStrip
or as it would be expected in a call to
.IR TIFFWriteEncodedStrip .
.PP
.I TIFFVStripSize
returns the number of bytes in a strip with
.I nrows
rows of data.
.PP
.I TIFFRawStripSize
returns the number of bytes in a raw strip (i.e. not decoded).
.PP
.IR TIFFComputeStrip
returns the strip that contains the specified coordinates.
A valid strip is always returned;
out-of-range coordinate values are clamped to the bounds of the image.
The
.I row
parameter is always used in calculating a strip.
The
.I sample
parameter is used only if data are organized in separate planes (\c
.IR PlanarConfiguration =2).
.PP
.IR TIFFNumberOfStrips
returns the number of strips in the image.
.SH DIAGNOSTICS
None.
.SH "SEE ALSO"
.IR libtiff (3T),
.IR TIFFReadEncodedStrip (3T),
.IR TIFFReadRawStrip (3T),
.IR TIFFWriteEncodedStrip (3T),
.IR TIFFWriteRawStrip (3T)