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-<!-- Creator : groff version 1.18.1 -->
-<!-- CreationDate: Sat Feb 24 18:37:17 2007 -->
-<html>
-<head>
-<meta name="generator" content="groff -Thtml, see www.gnu.org">
-<meta name="Content-Style" content="text/css">
-<title>TIFFReadRGBATile</title>
-</head>
-<body>
-
-<h1 align=center>TIFFReadRGBATile</h1>
-<a href="#NAME">NAME</a><br>
-<a href="#SYNOPSIS">SYNOPSIS</a><br>
-<a href="#DESCRIPTION">DESCRIPTION</a><br>
-<a href="#NOTES">NOTES</a><br>
-<a href="#RETURN VALUES">RETURN VALUES</a><br>
-<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
-<a href="#SEE ALSO">SEE ALSO</a><br>
-
-<hr>
-<a name="NAME"></a>
-<h2>NAME</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p>TIFFReadRGBATile &minus; read and decode an image tile
-into a fixed-format raster</p>
-</td>
-</table>
-<a name="SYNOPSIS"></a>
-<h2>SYNOPSIS</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p><b>#include &lt;tiffio.h&gt;</b></p>
-</td>
-</table>
-<!-- TABS -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="5" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="-2%">
-
-<p><b>#define TIFFGetR(abgr)</b></p>
-</td>
-<td width="25%"></td>
-<td width="6%"></td>
-<td width="61%">
-
-<p><b>((abgr) &amp; 0xff)</b></p>
-</td>
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="-2%">
-
-<p><b>#define TIFFGetG(abgr)</b></p>
-</td>
-<td width="25%"></td>
-<td width="6%"></td>
-<td width="61%">
-
-<p><b>(((abgr) &gt;&gt; 8) &amp; 0xff)</b></p>
-</td>
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="-2%">
-
-<p><b>#define TIFFGetB(abgr)</b></p>
-</td>
-<td width="25%"></td>
-<td width="6%"></td>
-<td width="61%">
-
-<p><b>(((abgr) &gt;&gt; 16) &amp; 0xff)</b></p>
-</td>
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="-2%">
-
-<p><b>#define TIFFGetA(abgr)</b></p>
-</td>
-<td width="25%"></td>
-<td width="6%"></td>
-<td width="61%">
-
-<p><b>(((abgr) &gt;&gt; 24) &amp; 0xff)</b></p>
-</td>
-</table>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p><b>int TIFFReadRGBATile(TIFF *</b><i>tif</i><b>,
-uint32</b> <i>x</i><b>, uint32</b> <i>y</i><b>, uint32
-*</b><i>raster</i><b>)</b></p>
-</td>
-</table>
-<a name="DESCRIPTION"></a>
-<h2>DESCRIPTION</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p><i>TIFFReadRGBATile</i> reads a single tile of a
-tile-based image into memory, storing the result in the user
-supplied RGBA <i>raster</i>. The raster is assumed to be an
-array of width times length 32-bit entries, where width is
-the width of a tile (TIFFTAG_TILEWIDTH) and length is the
-height of a tile (TIFFTAG_TILELENGTH).</p>
-<!-- INDENTATION -->
-<p>The <i>x</i> and <i>y</i> values are the offsets from the
-top left corner to the top left corner of the tile to be
-read. They must be an exact multiple of the tile width and
-length.</p>
-<!-- INDENTATION -->
-<p>Note that the raster is assume to be organized such that
-the pixel at location (<i>x</i>,<i>y</i>) is
-<i>raster</i>[<i>y</i>*<i>width</i>+<i>x</i>]; with the
-raster origin in the <i>lower-left hand corner</i> of the
-tile. That is bottom to top organization. Edge tiles which
-partly fall off the image will be filled out with
-appropriate zeroed areas.</p>
-<!-- INDENTATION -->
-<p>Raster pixels are 8-bit packed red, green, blue, alpha
-samples. The macros <i>TIFFGetR</i>, <i>TIFFGetG</i>,
-<i>TIFFGetB</i>, and <i>TIFFGetA</i> should be used to
-access individual samples. Images without Associated Alpha
-matting information have a constant Alpha of 1.0 (255).</p>
-<!-- INDENTATION -->
-<p>See the <i>TIFFRGBAImage</i>(3TIFF) page for more details
-on how various image types are converted to RGBA values.</p>
-</td>
-</table>
-<a name="NOTES"></a>
-<h2>NOTES</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p>Samples must be either 1, 2, 4, 8, or 16 bits.
-Colorimetric samples/pixel must be either 1, 3, or 4 (i.e.
-<i>SamplesPerPixel</i> minus <i>ExtraSamples</i>).</p>
-<!-- INDENTATION -->
-<p>Palette image colormaps that appear to be incorrectly
-written as 8-bit values are automatically scaled to
-16-bits.</p>
-<!-- INDENTATION -->
-<p><i>TIFFReadRGBATile</i> is just a wrapper around the more
-general <i>TIFFRGBAImage</i>(3TIFF) facilities. It&rsquo;s
-main advantage over the similar <i>TIFFReadRGBAImage()</i>
-function is that for large images a single buffer capable of
-holding the whole image doesn&rsquo;t need to be allocated,
-only enough for one tile. The <i>TIFFReadRGBAStrip()</i>
-function does a similar operation for stripped images.</p>
-</td>
-</table>
-<a name="RETURN VALUES"></a>
-<h2>RETURN VALUES</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p>1 is returned if the image was successfully read and
-converted. Otherwise, 0 is returned if an error was
-encountered.</p>
-</td>
-</table>
-<a name="DIAGNOSTICS"></a>
-<h2>DIAGNOSTICS</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p>All error messages are directed to the
-<i>TIFFError</i>(3TIFF) routine.</p>
-<!-- INDENTATION -->
-<p><b>Sorry, can not handle %d-bit pictures</b>. The image
-had <i>BitsPerSample</i> other than 1, 2, 4, 8, or 16.</p>
-<!-- INDENTATION -->
-<p><b>Sorry, can not handle %d-channel images</b>. The image
-had <i>SamplesPerPixel</i> other than 1, 3, or 4.</p>
-<!-- INDENTATION -->
-<p><b>Missing needed &quot;PhotometricInterpretation&quot;
-tag</b>. The image did not have a tag that describes how to
-display the data.</p>
-<!-- INDENTATION -->
-<p><b>No &quot;PhotometricInterpretation&quot; tag, assuming
-RGB</b>. The image was missing a tag that describes how to
-display it, but because it has 3 or 4 samples/pixel, it is
-assumed to be <small>RGB.</small></p>
-<!-- INDENTATION -->
-<p><b>No &quot;PhotometricInterpretation&quot; tag, assuming
-min-is-black</b>. The image was missing a tag that describes
-how to display it, but because it has 1 sample/pixel, it is
-assumed to be a grayscale or bilevel image.</p>
-<!-- INDENTATION -->
-<p><b>No space for photometric conversion table</b>. There
-was insufficient memory for a table used to convert image
-samples to 8-bit <small>RGB.</small></p>
-<!-- INDENTATION -->
-<p><b>Missing required &quot;Colormap&quot; tag</b>. A
-Palette image did not have a required <i>Colormap</i>
-tag.</p>
-<!-- INDENTATION -->
-<p><b>No space for tile buffer</b>. There was insufficient
-memory to allocate an i/o buffer.</p>
-<!-- INDENTATION -->
-<p><b>No space for strip buffer</b>. There was insufficient
-memory to allocate an i/o buffer.</p>
-<!-- INDENTATION -->
-<p><b>Can not handle format</b>. The image has a format
-(combination of <i>BitsPerSample</i>,
-<i>SamplesPerPixel</i>, and
-<i>PhotometricInterpretation</i>) that
-<i>TIFFReadRGBAImage</i> can not handle.</p>
-<!-- INDENTATION -->
-<p><b>No space for B&amp;W mapping table</b>. There was
-insufficient memory to allocate a table used to map
-grayscale data to <small>RGB.</small></p>
-<!-- INDENTATION -->
-<p><b>No space for Palette mapping table</b>. There was
-insufficient memory to allocate a table used to map data to
-8-bit <small>RGB.</small></p>
-</td>
-</table>
-<a name="SEE ALSO"></a>
-<h2>SEE ALSO</h2>
-<!-- INDENTATION -->
-<table width="100%" border=0 rules="none" frame="void"
- cols="2" cellspacing="0" cellpadding="0">
-<tr valign="top" align="left">
-<td width="8%"></td>
-<td width="91%">
-<p><b>TIFFOpen</b>(3TIFF), <b>TIFFRGBAImage</b>(3TIFF),
-<b>TIFFReadRGBAImage</b>(3TIFF),
-<b>TIFFReadRGBAStrip</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
-<!-- INDENTATION -->
-<p>Libtiff library home page:
-<b>http://www.remotesensing.org/libtiff/</b></p>
-</td>
-</table>
-<hr>
-</body>
-</html>