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<title>write_image (1D)</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
<meta name="keywords" content="write_image1d" />
</head>
<body>
<div class="refentry">
<a id="idm1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="write_image1d"></a>
<h1>write_image1d</h1>
<p>
Write <code xmlns="http://www.w3.org/1999/xhtml" class="varname">color</code> value to location in a 1D image object.
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imagef
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imagef
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_buffer_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imagef
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_array_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imagei
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imagei
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_buffer_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imagei
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_array_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imageui
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imageui
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_buffer_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imageui
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_array_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imageh
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">half4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imageh
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_buffer_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">half4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
write_imageh
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image1d_array_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">half4</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
<code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
<code class="function">write_imagef</code> can only be used with image objects created with
<code class="varname">image_channel_data_type</code> set to one of the pre-defined packed formats
or set to <code class="constant">CL_SNORM_INT8</code>, <code class="constant">CL_UNORM_INT8</code>,
<code class="constant">CL_SNORM_INT16</code>, <code class="constant">CL_UNORM_INT16</code>,
<code class="constant">CL_HALF_FLOAT</code>, or <code class="constant">CL_FLOAT</code>. Appropriate data
format conversion will be done to convert channel data from a floating-point value to
actual data format in which the channels are stored.
</p>
<p>
<code class="function">write_imagei</code> functions can only be used with image objects
created with <code class="varname">image_channel_data_type</code> set to one of the following
values: <code class="constant">CL_SIGNED_INT8</code>, <code class="constant">CL_SIGNED_INT16</code>,
or <code class="constant">CL_SIGNED_INT32</code>.
</p>
<p>
<code class="function">write_imageui</code> functions can only be used with image objects
created with <code class="varname">image_channel_data_type</code> set to one of the following
values: <code class="constant">CL_UNSIGNED_INT8</code>, <code class="constant">CL_UNSIGNED_INT16</code>,
or <code class="constant">CL_UNSIGNED_INT32</code>.
</p>
<p>
The <code class="function">write_imageh</code> functions are enabled when the half type is
supported and can only be used with image objects created with
<code class="varname">image_channel_data_type</code> set to one of the pre-defined packed formats
or set to <code class="constant">CL_SNORM_INT8</code>, <code class="constant">CL_UNORM_INT8</code>,
<code class="constant">CL_SNORM_INT16</code>, <code class="constant">CL_UNORM_INT16</code> or
<code class="constant">CL_HALF_FLOAT</code>. Appropriate data format conversion will be done
to convert channel data from a floating-point value to actual data format in which
the channels are stored.
</p>
<h4><a id="idm217"></a>Functions that take image1d_t or image1d_buffer_t</h4>
<p>
The functions that take image1d_t or image1d_buffer_t write the <code class="varname">color</code>
value to the location specified by <code class="varname">coord</code> in the 1D image or 1D image buffer
object specified by <code class="varname">image</code>. Appropriate data format conversion to the
specified image format is done before writing the color value. <code class="varname">coord</code> is
considered to be unnormalized coordinates and must be in the range 0... image width - 1.
</p>
<p>
for functions taking image1d_t or image1d_buffer_t, the behavior of
<code class="function">write_imagef</code>, <code class="function">write_imagei</code>,
<code class="function">write_imageui</code>, and <code class="function">write_imageh</code> for image
objects created with <code class="varname">image_channel_data_type</code> values not specified in
the description above or with coordinate values that are not in the range (0... image
width - 1), is undefined.
</p>
<h4><a id="idm229"></a>Functions that take image1d_array_t</h4>
<p>
The functions that take image1d_array_t write the <code class="varname">color</code> value to the location specified by
<span class="emphasis"><em>coord.x</em></span> in the 1D image identified by <span class="emphasis"><em>coord.y</em></span>
in the 1D image array specified by <code class="varname">image</code>. Appropriate data format
conversion to the specified image format is done before writing the color value.
<span class="emphasis"><em>coord.x</em></span> and <span class="emphasis"><em>coord.y</em></span> are considered to be
unnormalized coordinates and must be in the range 0 … image width - 1 and 0 …
image number of layers - 1.
</p>
<p>
For functions taking image1d_array_t, the behavior of <code class="function">write_imagef</code>,
<code class="function">write_imagei</code> and <code class="function">write_imageui</code> for image
objects created with <code class="varname">image_channel_data_type</code> values not specified
in the description above or with (x, y) coordinate values that are not in the range
(0 … image width - 1, 0 …image number of layers - 1), respectively, is undefined.
</p>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
The built-in functions defined in this section
can only be used with image memory objects. An image memory object can be accessed by
specific function calls that read from and/or write to specific locations in the image.
</p>
<p>
Image memory objects that are being read by a kernel should be declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__read_only</span></span></a>
qualifier. <code class="function">write_image</code> calls to image memory objects declared with the
<a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__read_only</span></span></a>
qualifier will generate a compilation error. Image memory objects that
are being written to by a kernel should be declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__write_only</span></span></a> qualifier.
<code class="function">read_image</code> calls to image memory objects declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__write_only</span></span></a>
qualifier will generate a compilation error. <code class="function">read_image</code> and
<code class="function">write_image</code> calls to the same image memory object in a kernel are
not supported.
</p>
<p>
The <code class="function">read_image</code> calls returns a four component floating-point, integer or
unsigned integer color value. The color values returned by <code class="function">read_image</code>
are identified as <code class="code">x, y, z, w</code> where <code class="code">x</code> refers to the red component,
<code class="code">y</code> refers to the green component, <code class="code">z</code> refers to the blue component
and <code class="code">w</code> refers to the alpha component.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=292" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="imageFunctions.html"><span class="citerefentry"><span class="refentrytitle">Image Functions</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
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in all copies or substantial portions of the Materials.
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