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<H1>TIFFReadTile</H1>
Section: Misc. Reference Manual Pages (3T)<BR>Updated: December 16, 1991<BR><A HREF="#index">Index</A>
<BR><A HREF="index.html">Return to Main Contents</A>
<HR>

<A NAME="lbAB">&nbsp;</A>
<H2>NAME</H2>

TIFFReadTile - read and decode a tile of data from an open
<FONT SIZE="-1">TIFF</FONT>
file
<A NAME="lbAC">&nbsp;</A>
<H2>SYNOPSIS</H2>

<B>#include &lt;<A HREF="file:/usr/include/tiffio.h">tiffio.h</A>&gt;</B>

<BR>

<B>tsize_t TIFFReadTile(TIFF* tif, tdata_t buf, uint32 x, uint32 y, uint32 z, tsample_t sample)</B>

<A NAME="lbAD">&nbsp;</A>
<H2>DESCRIPTION</H2>

Return the data for the tile
<I>containing</I>

the specified coordinates.
The data placed in
<I>buf</I>

are returned decompressed and, typically, in the native byte-
and bit-ordering, but are otherwise packed (see further below).
The buffer must be large enough to hold an entire tile of data.
Applications should call the routine
<I>TIFFTileSize</I>

to find out the size (in bytes) of a tile buffer.
The
<I>x</I>

and
<I>y</I>

parameters are always used by
<I>TIFFReadTile</I>.

The
<I>z</I>

parameter is used if the image is deeper than 1 slice (<I>ImageDepth</I>&gt;1).

The
<I>sample</I>

parameter is used only if data are organized in separate planes (<I>PlanarConfiguration</I>=2).

<A NAME="lbAE">&nbsp;</A>
<H2>NOTES</H2>

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</I>

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,
<A NAME="lbAF">&nbsp;</A>
<H2>RETURN VALUES</H2>

<I>TIFFReadTile</I>

returns -1 if it detects an error; otherwise the number of
bytes in the decoded tile is returned.
<A NAME="lbAG">&nbsp;</A>
<H2>DIAGNOSTICS</H2>

All error messages are directed to the
<I><A HREF="TIFFError.3t.html">TIFFError</A></I>(3T)

routine.
<A NAME="lbAH">&nbsp;</A>
<H2>SEE ALSO</H2>

<I><A HREF="libtiff.3t.html">libtiff</A></I>(3T),

<I><A HREF="TIFFCheckTile.3t.html">TIFFCheckTile</A></I>(3T),

<I><A HREF="TIFFComputeTile.3t.html">TIFFComputeTile</A></I>(3T),

<I><A HREF="TIFFOpen.3t.html">TIFFOpen</A></I>(3T),

<I><A HREF="TIFFReadEncodedTile.3t.html">TIFFReadEncodedTile</A></I>(3T),

<I><A HREF="TIFFReadRawTile.3t.html">TIFFReadRawTile</A></I>(3T)


<HR>
<A NAME="index">&nbsp;</A><H2>Index</H2>
<DL>
<DT><A HREF="#lbAB">NAME</A><DD>
<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT><A HREF="#lbAE">NOTES</A><DD>
<DT><A HREF="#lbAF">RETURN VALUES</A><DD>
<DT><A HREF="#lbAG">DIAGNOSTICS</A><DD>
<DT><A HREF="#lbAH">SEE ALSO</A><DD>
</DL>
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Time: 01:31:38 GMT, November 23, 1999
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