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<title>write_image (2D)</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
<meta name="keywords" content="write_image2d" />
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<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_image2d"></a>
<h1>write_image</h1>
<p>
Write <code xmlns="http://www.w3.org/1999/xhtml" class="varname">color</code> value to location in a 2D 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">image2d_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_imagef
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_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">int4</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">image2d_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_imagei
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_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">int4</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">image2d_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_imageui
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_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">int4</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">image2d_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 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">image2d_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">int4</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> 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>,
and <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>
An application that wants to use <span class="type">half</span> and
<span class="type">half<em class="replaceable"><code>n</code></em></span> types will need to include the <code class="code">#pragma
OPENCL EXTENSION <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a>
: enable</code> directive.
</p>
<p>
<code class="function">write_imageh</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> or
<code class="constant">CL_HALF_FLOAT</code>.
</p>
<h4><a id="idm168"></a>Functions that take image2d_t</h4>
<p>
For the functions that take an image_2d_t image, write color value to location specified by
<span class="emphasis"><em>coord.xy</em></span> in the 2D image object 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 height - 1.
</p>
<p>
For functions that take image_2d_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 <span class="emphasis"><em>(x, y)</em></span> coordinate values that are not in the range
(0 … image width - 1, 0 … image height - 1), respectively, is undefined.
</p>
<h4><a id="idm181"></a>Functions that take image2d_array_t</h4>
<p>
For the functions that take an image_2d_array_t image, write color value
to location specified by <span class="emphasis"><em>coord.xy</em></span> in the 2D image
identified by <span class="emphasis"><em>coord.z</em></span> in the 2D 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>,
<span class="emphasis"><em>coord.y</em></span> and <span class="emphasis"><em>coord.z</em></span> are considered to be
unnormalized coordinates and must be in the range 0 … image width - 1, 0 … image
height - 1 and 0 … image number of layers - 1.
</p>
<p>
For functions that take image_2d_array_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 <span class="emphasis"><em>(x, y, z)</em></span> coordinate values that are
not in the range (0 … image width - 1, 0 … image height - 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
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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