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<title>clEnqueueReadImage</title>
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<div class="refentry">
<a id="idm1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clEnqueueReadImage"></a>
<h1>
clEnqueueReadImage
</h1>
<p>
Enqueue commands to read from an image or image array object to host memory.
</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">cl_int</a>
<strong class="fsfunc">clEnqueueReadImage</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</var>
, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_bool" target="pagedisplay">cl_bool</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">blocking_read</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>const
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*origin</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>const
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*region</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">row_pitch</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">slice_pitch</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*ptr</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>const
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a>
<var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event_wait_list</var>
, </td>
</tr>
<tr valign="top">
<td> </td>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</var>
<code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="parameters"></a>
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term"> <code class="varname"> command_queue </code> </span>
</dt>
<dd>
<p>
Refers to the command-queue in which the read command will be
queued. <code class="varname">command_queue</code> and <code class="varname">image</code>
must be created with the same OpenCL context.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> image </code> </span>
</dt>
<dd>
<p>
Refers to a valid image or image array object.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> blocking_read </code> </span>
</dt>
<dd>
<p>
Indicates if the read operations are <code class="varname">blocking</code> or
<code class="varname">non-blocking</code>.
</p>
<p>
If <code class="varname">blocking_read</code> is <code class="constant">CL_TRUE</code>
i.e. the read command is blocking, <code class="function">clEnqueueReadImage</code>
does not return until the buffer data has been read and copied into memory
pointed to by <code class="varname">ptr</code>.
</p>
<p>
If <code class="varname">blocking_read</code> is <code class="constant">CL_FALSE</code>
i.e. map operation is non-blocking, <code class="function">clEnqueueReadImage</code>
queues a non-blocking read command and returns. The contents of the
buffer that <code class="varname">ptr</code> points to cannot be used until the read
command has completed. The <code class="varname">event</code> argument returns an
event object which can be used to query the execution status of the read
command. When the read command has completed, the contents of the buffer
that <code class="varname">ptr</code> points to can be used by the application.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> origin </code> </span>
</dt>
<dd>
<p>
Defines the (<span class="emphasis"><em>x, y, z</em></span>) offset in pixels in the 1D, 2D, or
3D image, the (<span class="emphasis"><em>x, y</em></span>) offset and the image index in the
image array or the (x) offset and the image index in the 1D image array. If
<code class="varname">image</code> is a 2D image object, <code class="varname">origin</code>[2]
must be 0. If <code class="varname">image</code> is a 1D image or 1D image buffer
object, <code class="varname">origin</code>[1] and <code class="varname">origin</code>[2]
must be 0. If <code class="varname">image</code> is a 1D image array object,
<code class="varname">origin</code>[2] must be 0. If <code class="varname">image</code>
is a 1D image array object, <code class="varname">origin</code>[1] describes the
image index in the 1D image array. If <code class="varname">image</code> is a 2D
image array object, <code class="varname">origin</code>[2] describes the image
index in the 2D image array.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> region </code> </span>
</dt>
<dd>
<p>
Defines the (<span class="emphasis"><em>width, height, depth</em></span>) in pixels of the
1D, 2D or 3D rectangle, the (<span class="emphasis"><em>width, height</em></span>) in pixels
of the 2D rectangle and the number of images of a 2D image array or the
(<span class="emphasis"><em>width</em></span>) in pixels of the 1D rectangle and the number
of images of a 1D image array. If <code class="varname">image</code> is a 2D image
object, <code class="varname">region</code>[2] must be 1. If <code class="varname">image</code>
is a 1D image or 1D image buffer object, <code class="varname">region</code>[1]
and <code class="varname">region</code>[2] must be 1. If image is a 1D image array
object, <code class="varname">region</code>[2] must be 1.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> row_pitch </code> </span>
</dt>
<dd>
<p>
The length of each row in bytes. This value must be greater than or
equal to the element size in bytes * <code class="varname">width</code>. If
<code class="varname">row_pitch</code> is set to 0, the appropriate row pitch
is calculated based on the size of each element in bytes multiplied by
<code class="varname">width</code>.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> slice_pitch </code> </span>
</dt>
<dd>
<p>
Size in bytes of the 2D slice of the 3D region of a 3D image or
each image of a 1D or 2D image array being read. This must be 0 if
<code class="varname">image</code> is a 1D or 2D image. This value must be greater
than or equal to <code class="varname">row_pitch</code> * <code class="varname">height</code>.
If <code class="varname">slice_pitch</code> is set to 0, the appropriate slice
pitch is calculated based on the <code class="varname">row_pitch</code> *
<code class="varname">height</code>.
</p>
</dd>
<dt>
<span class="term"> <code class="varname"> ptr </code> </span>
</dt>
<dd>
<p>
The pointer to a buffer in host memory where image data is to be read from.
</p>
</dd>
<dt>
<span class="term"> <code class="varname">
event_wait_list
,</code>
<code class="varname">
num_events_in_wait_list
</code>
</span>
</dt>
<dd>
<p>
Specify events that need to complete before this particular
command can be executed. If <code class="varname">event_wait_list</code>
is NULL, then this particular command does not wait on any
event to complete. If <code class="varname">event_wait_list</code> is
NULL, <code class="varname">num_events_in_wait_list</code> must be 0. If
<code class="varname">event_wait_list</code> is not NULL, the list of events
pointed to by <code class="varname">event_wait_list</code> must be valid
and <code class="varname">num_events_in_wait_list</code> must be greater
than 0. The events specified in <code class="varname">event_wait_list</code>
act as synchronization points. The context associated with events in
<code class="varname">event_wait_list</code> and <code class="varname">command_queue</code> must
be the same. The memory associated with <code class="varname">event_wait_list</code>
can be reused or freed after the function returns.
</p>
</dd>
<dt>
<span class="term">
<code class="varname">
event
</code>
</span>
</dt>
<dd>
<p>
Returns an event object that identifies this particular read command
and can be used to query or queue a wait for this particular command
to complete. <code class="varname">event</code> can be NULL in which case
it will not be possible for the application to query the status of
this command or queue a wait for this command to complete. If the
<code class="varname">event_wait_list</code> and the <code class="varname">event</code>
arguments are not NULL, the <code class="varname">event</code> argument should not
refer to an element of the <code class="varname">event_wait_list</code> array.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
Calling <code class="function">clEnqueueReadImage</code> to read a region of the
<code class="varname">image</code> with the <code class="varname">ptr</code> argument value set to
<code class="varname">host_ptr</code> + (<code class="varname">origin</code>[2] * <code class="varname">image
slice pitch</code> + <code class="varname">origin</code>[1] * <code class="varname">image
row pitch</code> + <code class="varname">origin</code>[0] * <code class="varname">bytes per
pixel</code>), where <code class="varname">host_ptr</code> is a pointer to the memory
region specified when the <code class="varname">image</code> being read is created with
<code class="constant">CL_MEM_USE_HOST_PTR</code>, must meet the following requirements in
order to avoid undefined behavior:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem" style="list-style-type: disc">
All commands that use this image object have finished execution before the read
command begins execution.
</li>
<li class="listitem" style="list-style-type: disc">
The <code class="varname">row_pitch</code> and <code class="varname">slice_pitch</code> argument
values in <code class="function">clEnqueueReadImage</code> must be set to the image row
pitch and slice pitch.
</li>
<li class="listitem" style="list-style-type: disc">
The image object is not mapped.
</li>
<li class="listitem" style="list-style-type: disc">
The image object is not used by any command-queue until the read command has
finished execution.
</li>
</ul>
</div>
</div>
<div class="refsect1">
<a id="errors"></a>
<h2>Errors</h2>
<p>
<code class="function">clEnqueueReadImage</code> returns <span class="errorname">CL_SUCCESS</span> if
the function is executed successfully. Otherwise, it returns one of the following errors.
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if <code class="varname">command_queue</code>
is not a valid command-queue.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if the context associated with
<code class="varname">command_queue</code> and <code class="varname">image</code> are not the same
or if the context associated with <code class="varname">command_queue</code> and events in
<code class="varname">event_wait_list</code> are not the same.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if <code class="varname">image</code> is not
a valid image object.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if the region being read specified by
<code class="varname">origin</code> and <code class="varname">region</code> is out of bounds or if
<code class="varname">ptr</code> is a NULL value.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if values in <code class="varname">origin</code>
and <code class="varname">region</code> do not follow rules described in the argument
description for <code class="varname">origin</code> and <code class="varname">region</code>.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT_WAIT_LIST</span>
if <code class="varname">event_wait_list</code> is NULL and
<code class="varname">num_events_in_wait_list</code> > 0,
or <code class="varname">event_wait_list</code> is not NULL and
<code class="varname">num_events_in_wait_list</code> is 0, or if event objects in
<code class="varname">event_wait_list</code> are not valid events.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_SIZE</span> if image dimensions (image width,
height, specified or compute row and/or slice pitch) for <code class="varname">image</code>
are not supported by device associated with <code class="varname">queue</code>.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_IMAGE_FORMAT</span> if image format (image channel
order and data type) for <code class="varname">image</code> are not supported by device
associated with <code class="varname">queue</code>.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a failure to
allocate memory for data store associated with <code class="varname">image</code>.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if the device associated
with <code class="varname">command_queue</code> does not support images
(i.e. <code class="constant">CL_DEVICE_IMAGE_SUPPORT</code> specified in
the table of allowed values for <code class="varname">param_name</code> for
<a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>
is <code class="constant">CL_FALSE</code>).
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_OPERATION</span> if
<code class="function">clEnqueueReadImage</code> is called on <code class="varname">image</code>
which has been created with <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> or
<code class="constant">CL_MEM_HOST_NO_ACCESS</code></li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST</span> if the read
and write operations are blocking and the execution status of any of the events
in <code class="varname">event_wait_list</code> is a negative integer value.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate
resources required by the OpenCL implementation on the device.
</li>
<li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate
resources required by the OpenCL implementation on the host.
</li>
</ul>
</div>
</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=98" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a>,
<a class="citerefentry" href="clEnqueueCopyImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImage</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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