tiffbuffer.3t

tiff文件开发库

.\" $Header: /cvsroot/osrs/libtiff/man/TIFFbuffer.3t,v 1.1.1.1 1999/07/27 21:50:27 mike Exp $
.\"
.\" Copyright (c) 1995 Sam Leffler
.\" Copyright (c) 1995 Silicon Graphics, Inc.
.\"
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.if n .po 0
.TH TIFFBUFFER 3T "October 15, 1995"
.SH NAME
TIFFReadBufferSetup,
TIFFWriteBufferSetup
\- I/O buffering control routines
.SH SYNOPSIS
.nf
.B "#include <tiffio.h>"
.B "int TIFFReadBufferSetup(TIFF*, tdata_t buffer, tsize_t size);"
.B "int TIFFWriteBufferSetup(TIFF*, tdata_t buffer, tsize_t size);"
.fi
.SH DESCRIPTION
The following routines are provided for client-control of the
I/O buffers used by the library.
Applications need never use these routines; they are provided only
for ``intelligent clients'' that wish to optimize memory usage and/or
eliminate potential copy operations that can occur when working with
images that have data stored without compression.
.PP
.I TIFFReadBufferSetup
sets up the data buffer used to read raw (encoded) data from a file.
If the specified pointer is
.SM NULL
(zero), then a buffer of the appropriate size is allocated.
Otherwise the caller must guarantee that the buffer is large
enough to hold any individual strip of raw data.
.I TIFFReadBufferSetup
returns a non-zero value if the setup was successful and zero otherwise.
.PP
.I TIFFWriteBufferSetup
sets up the data buffer used to write raw (encoded) data to a file.
If the specified
.I size
is \-1 then the buffer size is selected to hold a complete
tile or strip, or at least 8 kilobytes, whichever is greater.
If the specified
.I buffer
is 
.SM NULL
(zero), then a buffer of the appropriate size is dynamically allocated.
.I TIFFWriteBufferSetup
returns a non-zero value if the setup was successful and zero otherwise.
.SH DIAGNOSTICS
.BR "%s: No space for data buffer at scanline %ld" .
.I TIFFReadBufferSetup
was unable to dynamically allocate space for a data buffer.
.PP
.BR "%s: No space for output buffer" .
.I TIFFWriteBufferSetup
was unable to dynamically allocate space for a data buffer.
.SH "SEE ALSO"
.IR libtiff (3T)