NAME

       clEnqueueCopyImageToBuffer - Enqueues a command to copy an image object to a buffer
       object.

       cl_int clEnqueueCopyImageToBuffer(cl_command_queue command_queue, cl_mem src_image,
                                         cl_mem dst_buffer, const size_t *src_origin,
                                         const size_t *region, size_t dst_offset,
                                         cl_uint num_events_in_wait_list,
                                         const cl_event *event_wait_list, cl_event *event);

PARAMETERS

        command_queue
           Must be a valid command-queue. The OpenCL context associated with command_queue,
           src_image, and dst_buffer must be the same.

        src_image
           A valid image object.

        dst_buffer
           A valid buffer object.

        src_origin
           Defines the (x, y, z) offset in pixels in the 1D, 2D or 3D image, the (x, y) offset
           and the image index in the 2D image array or the (x) offset and the image index in the
           1D image array. If src_image is a 2D image object, src_origin[2] must be 0. If
           src_image is a 1D image or 1D image buffer object, src_origin[1] and src_origin[2]
           must be 0. If src_image is a 1D image array object, src_origin[2] must be 0. If
           src_image is a 1D image array object, src_origin[1] describes the image index in the
           1D image array. If src_image is a 2D image array object, src_origin[2] describes the
           image index in the 2D image array.

        region
           Defines the (width, height, depth) in pixels of the 1D, 2D or 3D rectangle, the
           (width, height) in pixels of the 2D rectangle and the number of images of a 2D image
           array or the (width) in pixels of the 1D rectangle and the number of images of a 1D
           image array. If src_image is a 2D image object, region[2] must be 1. If src_image is a
           1D image or 1D image buffer object, region[1] and region[2] must be 1. If src_image is
           a 1D image array object, region[2] must be 1.

        dst_offset
           Refers to the offset where to begin copying data into dst_buffer. The size in bytes of
           the region to be copied referred to as dst_cb is computed as width * height * depth *
           bytes/image element if src_image is a 3D image object, is computed as width * height *
           bytes/image element if src_image is a 2D image, is computed as width * height *
           arraysize * bytes/image element if src_image is a 2D image array object, is computed
           as width * bytes/image element if src_image is a 1D image or 1D image buffer object
           and is computed as width * arraysize * bytes/image element if src_image is a 1D image
           array object.

        event_wait_list ,  num_events_in_wait_list
           Specify events that need to complete before this particular command can be executed.
           If event_wait_list is NULL, then this particular command does not wait on any event to
           complete. If event_wait_list is NULL, num_events_in_wait_list must be 0. If
           event_wait_list is not NULL, the list of events pointed to by event_wait_list must be
           valid and num_events_in_wait_list must be greater than 0. The events specified in
           event_wait_list act as synchronization points. The context associated with events in
           event_wait_list and command_queue must be the same. The memory associated with
           event_wait_list can be reused or freed after the function returns.

        event
           Returns an event object that identifies this particular copy command and can be used
           to query or queue a wait for this particular command to complete.  event 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.
           clEnqueueBarrierWithWaitList(3clc) can be used instead. If the event_wait_list and the
           event arguments are not NULL, the event argument should not refer to an element of the
           event_wait_list array.

ERRORS

       clEnqueueCopyImageToBuffer returns CL_SUCCESS if the function is executed successfully.
       Otherwise, it returns one of the following errors:

       ·   CL_INVALID_COMMAND_QUEUE if command_queue is not a valid command-queue.

       ·   CL_INVALID_CONTEXT if the context associated with command_queue, src_image and
           dst_buffer are not the same or if the context associated with command_queue and events
           in event_wait_list are not the same.

       ·   CL_INVALID_MEM_OBJECT if src_image is not a valid image object or dst_buffer is not a
           valid buffer object or if src_image is a 1D image buffer object created from
           dst_buffer.

       ·   CL_INVALID_VALUE if the 1D, 2D, or 3D rectangular region specified by src_origin and
           src_origin + region refers to a region outside src_image, or if the region specified
           by dst_offset and dst_offset + dst_cb refers to a region outside dst_buffer.

       ·   CL_INVALID_VALUE if values in src_origin and region do not follow rules described in
           the argument description for src_origin and region.

       ·   CL_INVALID_EVENT_WAIT_LIST if event_wait_list is NULL and num_events_in_wait_list > 0,
           or event_wait_list is not NULL and num_events_in_wait_list is 0, or if event objects
           in event_wait_list are not valid events.

       ·   CL_MISALIGNED_SUB_BUFFER_OFFSET if dst_buffer is a sub-buffer object and offset
           specified when the sub-buffer object is created is not aligned to
           CL_DEVICE_MEM_BASE_ADDR_ALIGN value for device associated with queue.

       ·   CL_INVALID_IMAGE_SIZE if image dimensions (image width, height, specified or compute
           row and/or slice pitch) for src_image are not supported by device associated with
           queue.

       ·   CL_INVALID_IMAGE_FORMAT if image format (image channel order and data type) for
           src_image are not supported by device associated with queue.

       ·   CL_MEM_OBJECT_ALLOCATION_FAILURE if there is a failure to allocate memory for data
           store associated with src_image or dst_buffer.

       ·   CL_INVALID_OPERATION if the device associated with command_queue does not support
           images (i.e. CL_DEVICE_IMAGE_SUPPORT specified in the table  of OpenCL Device Queries
           for clGetDeviceInfo(3clc) is CL_FALSE).

       ·   CL_OUT_OF_RESOURCES if there is a failure to allocate resources required by the OpenCL
           implementation on the device.

       ·   CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the
           OpenCL implementation on the host.

SPECIFICATION

       OpenCL Specification[1]

SEE ALSO

       clEnqueueReadBuffer(3clc), clEnqueueWriteBuffer(3clc), clCreateBuffer(3clc),
       clEnqueueCopyBuffer(3clc), clEnqueueCopyBufferToImage(3clc)

AUTHORS

       The Khronos Group

COPYRIGHT

       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.

NOTES

        1. OpenCL Specification
           page 107, section 5.3.4 - Copying between Image and Buffer Objects