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<H1>TIFFReadEncodedTile</H1>
Section: Misc. Reference Manual Pages (3T)<BR>Updated: October 15, 1995<BR><A HREF="#index">Index</A>
<BR><A HREF="index.html">Return to Main Contents</A>
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<A NAME="lbAB">&nbsp;</A>
<H2>NAME</H2>

TIFFReadEncodedTile - 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>int TIFFReadEncodedTile(TIFF* tif, u_long tile, u_char* buf, u_long size)</B>

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

Read the specified tile of data and place up to
<I>size</I>

bytes of decompressed information in the (user supplied) data buffer.
<A NAME="lbAE">&nbsp;</A>
<H2>NOTES</H2>

The value of
<I>tile</I>

is a ``raw tile number.''
That is, the caller must take into account whether or not the
data are organized in separate planes (<I>PlanarConfiguration</I>=2).

<I>TIFFComputeTile</I>

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
<I>TIFFTileSize</I>.

<P>

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>

The actual number of bytes of data that were placed in
<I>buf</I>

is returned;
<I>TIFFReadEncodedTile</I>

returns -1 if an error was encountered.
<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="TIFFOpen.3t.html">TIFFOpen</A></I>(3T),

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

<I><A HREF="TIFFReadTile.3t.html">TIFFReadTile</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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