[wxWidgets.git] / src / tiff / man / TIFFReadEncodedTile.3tiff

.\" $Id: TIFFReadEncodedTile.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
.\"
.\" Copyright (c) 1988-1997 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.
.\"
.if n .po 0
.TH TIFFReadEncodedTile 3TIFF "October 15, 1995" "libtiff"
.SH NAME
TIFFReadEncodedTile \- read and decode a tile of data from an open
.SM TIFF
file
.SH SYNOPSIS
.B "#include <tiffio.h>"
.sp
.BI "int TIFFReadEncodedTile(TIFF *" tif ", u_long " tile ", u_char *" buf ", u_long " size ")"
.SH DESCRIPTION
Read the specified tile of data and place up to
.I size
bytes of decompressed information in the (user supplied) data buffer.
.SH NOTES
The value of
.I tile
is a ``raw tile number.''
That is, the caller must take into account whether or not the data are
organized in separate planes (\c
.IR PlanarConfiguration =2).
.IR TIFFComputeTile
automatically does this when converting an (x,y,z,sample) coordinate quadruple
to a tile number. To read a full tile of data the data buffer should be at
least as large as the value returned by
.IR TIFFTileSize .
.PP
The library attempts to hide bit- and byte-ordering differences between the
image and the native machine by converting data to the native machine order.
Bit reversal is done if the
.I FillOrder
tag is opposite to the native machine bit order. 16- and 32-bit samples are
automatically byte-swapped if the file was written with a byte order opposite
to the native machine byte order,
.SH "RETURN VALUES"
The actual number of bytes of data that were placed in
.I buf
is returned;
.IR TIFFReadEncodedTile
returns \-1 if an error was encountered.
.SH DIAGNOSTICS
All error messages are directed to the
.BR TIFFError (3TIFF)
routine.
.SH "SEE ALSO"
.BR TIFFOpen (3TIFF),
.BR TIFFReadRawTile (3TIFF),
.BR TIFFReadTile (3TIFF),
.BR libtiff (3TIFF)
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff/
Commit	Line	Data
8414a40c VZ	1	.\" $Id: TIFFReadEncodedTile.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
	2	.\"
	3	.\" Copyright (c) 1988-1997 Sam Leffler
	4	.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	.\"
	6	.\" Permission to use, copy, modify, distribute, and sell this software and
	7	.\" its documentation for any purpose is hereby granted without fee, provided
	8	.\" that (i) the above copyright notices and this permission notice appear in
	9	.\" all copies of the software and related documentation, and (ii) the names of
	10	.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	.\" publicity relating to the software without the specific, prior written
	12	.\" permission of Sam Leffler and Silicon Graphics.
	13	.\"
	14	.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	.\"
	18	.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	.\" OF THIS SOFTWARE.
	24	.\"
	25	.if n .po 0
	26	.TH TIFFReadEncodedTile 3TIFF "October 15, 1995" "libtiff"
	27	.SH NAME
	28	TIFFReadEncodedTile \- read and decode a tile of data from an open
	29	.SM TIFF
	30	file
	31	.SH SYNOPSIS
	32	.B "#include <tiffio.h>"
	33	.sp
	34	.BI "int TIFFReadEncodedTile(TIFF " tif ", u_long " tile ", u_char " buf ", u_long " size ")"
	35	.SH DESCRIPTION
	36	Read the specified tile of data and place up to
	37	.I size
	38	bytes of decompressed information in the (user supplied) data buffer.
	39	.SH NOTES
	40	The value of
	41	.I tile
	42	is a ``raw tile number.''
	43	That is, the caller must take into account whether or not the data are
	44	organized in separate planes (\c
	45	.IR PlanarConfiguration =2).
	46	.IR TIFFComputeTile
	47	automatically does this when converting an (x,y,z,sample) coordinate quadruple
	48	to a tile number. To read a full tile of data the data buffer should be at
	49	least as large as the value returned by
	50	.IR TIFFTileSize .
	51	.PP
	52	The library attempts to hide bit- and byte-ordering differences between the
	53	image and the native machine by converting data to the native machine order.
	54	Bit reversal is done if the
	55	.I FillOrder
	56	tag is opposite to the native machine bit order. 16- and 32-bit samples are
	57	automatically byte-swapped if the file was written with a byte order opposite
	58	to the native machine byte order,
	59	.SH "RETURN VALUES"
	60	The actual number of bytes of data that were placed in
	61	.I buf
	62	is returned;
	63	.IR TIFFReadEncodedTile
	64	returns \-1 if an error was encountered.
65	.SH DIAGNOSTICS
66	All error messages are directed to the
67	.BR TIFFError (3TIFF)
68	routine.
69	.SH "SEE ALSO"
70	.BR TIFFOpen (3TIFF),
71	.BR TIFFReadRawTile (3TIFF),
72	.BR TIFFReadTile (3TIFF),
73	.BR libtiff (3TIFF)
74	.PP
75	Libtiff library home page:
76	.BR http://www.remotesensing.org/libtiff/