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| <title>clEnqueueReadImage</title> |
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| <meta name="keywords" content="clEnqueueReadImage" /> |
| </head> |
| <body> |
| <div class="refentry"> |
| <a id="id-1"></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 host 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. The values in <code class="varname">region</code> cannot be 0. |
| </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. Otherwise 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> |
| <p> |
| If the mipmap extensions are enabled with <a class="citerefentry" href="cl_khr_mipmap_image.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_mipmap_image</span></span></a>, |
| calls to <code class="function">clEnqueueReadImage</code>, |
| <a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a> and |
| <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> can be used to read |
| from or write to a specific mip-level of a mip-mapped image. |
| If image argument is a 1D image, <code class="varname">origin</code>[1] specifies the mip-level to use. |
| If image argument is a 1D image array, <code class="varname">origin</code>[2] specifies the mip-level to use. |
| If image argument is a 2D image, <code class="varname">origin</code>[3] specifies the mip-level to use. |
| If image argument is a 2D image array or a 3D image, <code class="varname">origin</code>[3] specifies the mip-level to use. |
| </p> |
| </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 host 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_IMAGE_FORMAT_NOT_SUPPORTED</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="https://www.khronos.org/registry/cl/specs/opencl-2.0.pdf#page=129" 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>, |
| <a class="citerefentry" href="cl_khr_mipmap_image.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_mipmap_image</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 © 2007-2013 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. |
| </div> |
| </div> |
| </body> |
| </html> |
