1 <!-- Creator : groff version 1.18.1 -->
2 <!-- CreationDate: Sat Feb 24 18:37:17 2007 -->
5 <meta name="generator" content="groff -Thtml, see www.gnu.org">
6 <meta name="Content-Style" content="text/css">
7 <title>TIFFReadEncodedTile</title>
11 <h1 align=center>TIFFReadEncodedTile</h1>
12 <a href="#NAME">NAME</a><br>
13 <a href="#SYNOPSIS">SYNOPSIS</a><br>
14 <a href="#DESCRIPTION">DESCRIPTION</a><br>
15 <a href="#NOTES">NOTES</a><br>
16 <a href="#RETURN VALUES">RETURN VALUES</a><br>
17 <a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
18 <a href="#SEE ALSO">SEE ALSO</a><br>
24 <table width="100%" border=0 rules="none" frame="void"
25 cols="2" cellspacing="0" cellpadding="0">
26 <tr valign="top" align="left">
29 <p>TIFFReadEncodedTile − read and decode a tile of
30 data from an open <small>TIFF</small> file</p>
33 <a name="SYNOPSIS"></a>
36 <table width="100%" border=0 rules="none" frame="void"
37 cols="2" cellspacing="0" cellpadding="0">
38 <tr valign="top" align="left">
41 <p><b>#include <tiffio.h></b></p>
43 <p><b>int TIFFReadEncodedTile(TIFF *</b><i>tif</i><b>,
44 ttile_t</b> <i>tile</i><b>, tdata_t</b> <i>buf</i><b>,
45 tsize_t</b> <i>size</i><b>)</b></p>
48 <a name="DESCRIPTION"></a>
51 <table width="100%" border=0 rules="none" frame="void"
52 cols="2" cellspacing="0" cellpadding="0">
53 <tr valign="top" align="left">
56 <p>Read the specified tile of data and place up to
57 <i>size</i> bytes of decompressed information in the (user
58 supplied) data buffer.</p>
64 <table width="100%" border=0 rules="none" frame="void"
65 cols="2" cellspacing="0" cellpadding="0">
66 <tr valign="top" align="left">
69 <p>The value of <i>tile</i> is a ‘‘raw tile
70 number.’’ That is, the caller must take into
71 account whether or not the data are organized in separate
72 planes (<i>PlanarConfiguration</i>=2).
73 <i>TIFFComputeTile</i> automatically does this when
74 converting an (x,y,z,sample) coordinate quadruple to a tile
75 number. To read a full tile of data the data buffer should
76 be at least as large as the value returned by
77 <i>TIFFTileSize</i>.</p>
79 <p>The library attempts to hide bit- and byte-ordering
80 differences between the image and the native machine by
81 converting data to the native machine order. Bit reversal is
82 done if the <i>FillOrder</i> tag is opposite to the native
83 machine bit order. 16- and 32-bit samples are automatically
84 byte-swapped if the file was written with a byte order
85 opposite to the native machine byte order,</p>
88 <a name="RETURN VALUES"></a>
89 <h2>RETURN VALUES</h2>
91 <table width="100%" border=0 rules="none" frame="void"
92 cols="2" cellspacing="0" cellpadding="0">
93 <tr valign="top" align="left">
96 <p>The actual number of bytes of data that were placed in
97 <i>buf</i> is returned; <i>TIFFReadEncodedTile</i> returns
98 −1 if an error was encountered.</p>
101 <a name="DIAGNOSTICS"></a>
104 <table width="100%" border=0 rules="none" frame="void"
105 cols="2" cellspacing="0" cellpadding="0">
106 <tr valign="top" align="left">
109 <p>All error messages are directed to the
110 <b>TIFFError</b>(3TIFF) routine.</p>
113 <a name="SEE ALSO"></a>
116 <table width="100%" border=0 rules="none" frame="void"
117 cols="2" cellspacing="0" cellpadding="0">
118 <tr valign="top" align="left">
121 <p><b>TIFFOpen</b>(3TIFF), <b>TIFFReadRawTile</b>(3TIFF),
122 <b>TIFFReadTile</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
124 <p>Libtiff library home page:
125 <b>http://www.remotesensing.org/libtiff/</b></p>