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Macros | Functions

vx_api.h File Reference

The API definition for OpenVX. More...

Go to the source code of this file.

Macros
#define	vxFormatArrayPointer(ptr, index, stride)    (&(((vx_uint8*)(ptr))[(index) * (stride)]))
	Accesses a specific indexed element in an array. More...
#define	vxArrayItem(type, ptr, index, stride)    (*(type *)(vxFormatArrayPointer((ptr), (index), (stride))))
	Allows access to an array item as a typecast pointer deference. More...

Functions
VX_API_ENTRY vx_context VX_API_CALL	vxCreateContext (void)
	Creates a vx_context. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseContext (vx_context *context)
	Releases the OpenVX object context. More...
VX_API_ENTRY vx_context VX_API_CALL	vxGetContext (vx_reference reference)
	Retrieves the context from any reference from within a context. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryContext (vx_context context, vx_enum attribute, void *ptr, vx_size size)
	Queries the context for some specific information. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetContextAttribute (vx_context context, vx_enum attribute, const void *ptr, vx_size size)
	Sets an attribute on the context. More...
VX_API_ENTRY vx_status VX_API_CALL	vxHint (vx_reference reference, vx_enum hint, const void *data, vx_size data_size)
	Provides a generic API to give platform-specific hints to the implementation. More...
VX_API_ENTRY vx_status VX_API_CALL	vxDirective (vx_reference reference, vx_enum directive)
	Provides a generic API to give platform-specific directives to the implementations. More...
VX_API_ENTRY vx_status VX_API_CALL	vxGetStatus (vx_reference reference)
	Provides a generic API to return status values from Object constructors if they fail. More...
VX_API_ENTRY vx_enum VX_API_CALL	vxRegisterUserStruct (vx_context context, vx_size size)
	Registers user-defined structures to the context. More...
VX_API_ENTRY vx_enum VX_API_CALL	vxRegisterUserStructWithName (vx_context context, vx_size size, const vx_char *type_name)
	Registers user-defined structures to the context, and associates a name to it. More...
VX_API_ENTRY vx_status VX_API_CALL	vxGetUserStructNameByEnum (vx_context context, vx_enum user_struct_type, vx_char *type_name, vx_size name_size)
	Returns the name of the user-defined structure associated with the enumeration given. More...
VX_API_ENTRY vx_status VX_API_CALL	vxGetUserStructEnumByName (vx_context context, const vx_char *type_name, vx_enum *user_struct_type)
	Returns the enum of the user-defined structure associated with the name given. More...
VX_API_ENTRY vx_status VX_API_CALL	vxAllocateUserKernelId (vx_context context, vx_enum *pKernelEnumId)
	Allocates and registers user-defined kernel enumeration to a context. The allocated enumeration is from available pool of 4096 enumerations reserved for dynamic allocation from VX_KERNEL_BASE(VX_ID_USER,0). More...
VX_API_ENTRY vx_status VX_API_CALL	vxAllocateUserKernelLibraryId (vx_context context, vx_enum *pLibraryId)
	Allocates and registers user-defined kernel library ID to a context. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetImmediateModeTarget (vx_context context, vx_enum target_enum, const char *target_string)
	Sets the default target of the immediate mode. Upon successful execution of this function any future execution of immediate mode function is attempted on the new default target of the context. More...
VX_API_ENTRY vx_image VX_API_CALL	vxCreateImage (vx_context context, vx_uint32 width, vx_uint32 height, vx_df_image color)
	Creates an opaque reference to an image buffer. More...
VX_API_ENTRY vx_image VX_API_CALL	vxCreateImageFromROI (vx_image img, const vx_rectangle_t *rect)
	Creates an image from another image given a rectangle. This second reference refers to the data in the original image. Updates to this image updates the parent image. The rectangle must be defined within the pixel space of the parent image. More...
VX_API_ENTRY vx_image VX_API_CALL	vxCreateUniformImage (vx_context context, vx_uint32 width, vx_uint32 height, vx_df_image color, const vx_pixel_value_t *value)
	Creates a reference to an image object that has a singular, uniform value in all pixels. The uniform image created is read-only. More...
VX_API_ENTRY vx_image VX_API_CALL	vxCreateVirtualImage (vx_graph graph, vx_uint32 width, vx_uint32 height, vx_df_image color)
	Creates an opaque reference to an image buffer with no direct user access. This function allows setting the image width, height, or format. More...
VX_API_ENTRY vx_image VX_API_CALL	vxCreateImageFromHandle (vx_context context, vx_df_image color, const vx_imagepatch_addressing_t addrs[], void *const ptrs[], vx_enum memory_type)
	Creates a reference to an image object that was externally allocated. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSwapImageHandle (vx_image image, void *const new_ptrs[], void *prev_ptrs[], vx_size num_planes)
	Swaps the image handle of an image previously created from handle. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryImage (vx_image image, vx_enum attribute, void *ptr, vx_size size)
	Retrieves various attributes of an image. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetImageAttribute (vx_image image, vx_enum attribute, const void *ptr, vx_size size)
	Allows setting attributes on the image. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetImagePixelValues (vx_image image, const vx_pixel_value_t *pixel_value)
	Initialize an image with the given pixel value. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseImage (vx_image *image)
	Releases a reference to an image object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY void *VX_API_CALL	vxFormatImagePatchAddress1d (void *ptr, vx_uint32 index, const vx_imagepatch_addressing_t *addr)
	Accesses a specific indexed pixel in an image patch. More...
VX_API_ENTRY void *VX_API_CALL	vxFormatImagePatchAddress2d (void *ptr, vx_uint32 x, vx_uint32 y, const vx_imagepatch_addressing_t *addr)
	Accesses a specific pixel at a 2d coordinate in an image patch. More...
VX_API_ENTRY vx_status VX_API_CALL	vxGetValidRegionImage (vx_image image, vx_rectangle_t *rect)
	Retrieves the valid region of the image as a rectangle. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyImagePatch (vx_image image, const vx_rectangle_t *image_rect, vx_uint32 image_plane_index, const vx_imagepatch_addressing_t *user_addr, void *user_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy a rectangular patch from/into an image object plane. More...
VX_API_ENTRY vx_status VX_API_CALL	vxMapImagePatch (vx_image image, const vx_rectangle_t *rect, vx_uint32 plane_index, vx_map_id *map_id, vx_imagepatch_addressing_t *addr, void **ptr, vx_enum usage, vx_enum mem_type, vx_uint32 flags)
	Allows the application to get direct access to a rectangular patch of an image object plane. More...
VX_API_ENTRY vx_status VX_API_CALL	vxUnmapImagePatch (vx_image image, vx_map_id map_id)
	Unmap and commit potential changes to a image object patch that were previously mapped. Unmapping an image patch invalidates the memory location from which the patch could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior. More...
VX_API_ENTRY vx_image VX_API_CALL	vxCreateImageFromChannel (vx_image img, vx_enum channel)
	Create a sub-image from a single plane channel of another image. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetImageValidRectangle (vx_image image, const vx_rectangle_t *rect)
	Sets the valid rectangle for an image according to a supplied rectangle. More...
VX_API_ENTRY vx_status VX_API_CALL	vxRegisterKernelLibrary (vx_context context, const vx_char *module, vx_publish_kernels_f publish, vx_unpublish_kernels_f unpublish)
	Registers a module with kernels in a context. More...
VX_API_ENTRY vx_status VX_API_CALL	vxLoadKernels (vx_context context, const vx_char *module)
	Loads a library of kernels, called module, into a context. More...
VX_API_ENTRY vx_status VX_API_CALL	vxUnloadKernels (vx_context context, const vx_char *module)
	Unloads all kernels from the OpenVX context that had been loaded from the module using the vxLoadKernels function. More...
VX_API_ENTRY vx_kernel VX_API_CALL	vxGetKernelByName (vx_context context, const vx_char *name)
	Obtains a reference to a kernel using a string to specify the name. More...
VX_API_ENTRY vx_kernel VX_API_CALL	vxGetKernelByEnum (vx_context context, vx_enum kernel)
	Obtains a reference to the kernel using the vx_kernel_e enumeration. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryKernel (vx_kernel kernel, vx_enum attribute, void *ptr, vx_size size)
	This allows the client to query the kernel to get information about the number of parameters, enum values, etc. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseKernel (vx_kernel *kernel)
	Release the reference to the kernel. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_kernel VX_API_CALL	vxAddUserKernel (vx_context context, const vx_char name[VX_MAX_KERNEL_NAME], vx_enum enumeration, vx_kernel_f func_ptr, vx_uint32 numParams, vx_kernel_validate_f validate, vx_kernel_initialize_f init, vx_kernel_deinitialize_f deinit)
	Allows users to add custom kernels to a context at run-time. More...
VX_API_ENTRY vx_status VX_API_CALL	vxFinalizeKernel (vx_kernel kernel)
	This API is called after all parameters have been added to the kernel and the kernel is ready to be used. Notice that the reference to the kernel created by vxAddUserKernel is still valid after the call to vxFinalizeKernel. If an error occurs, the kernel is not available for usage by the clients of OpenVX. Typically this is due to a mismatch between the number of parameters requested and given. More...
VX_API_ENTRY vx_status VX_API_CALL	vxAddParameterToKernel (vx_kernel kernel, vx_uint32 index, vx_enum dir, vx_enum data_type, vx_enum state)
	Allows users to set the signatures of the custom kernel. More...
VX_API_ENTRY vx_status VX_API_CALL	vxRemoveKernel (vx_kernel kernel)
	Removes a custom kernel from its context and releases it. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetKernelAttribute (vx_kernel kernel, vx_enum attribute, const void *ptr, vx_size size)
	Sets kernel attributes. More...
VX_API_ENTRY vx_parameter VX_API_CALL	vxGetKernelParameterByIndex (vx_kernel kernel, vx_uint32 index)
	Retrieves a vx_parameter from a vx_kernel. More...
VX_API_ENTRY vx_graph VX_API_CALL	vxCreateGraph (vx_context context)
	Creates an empty graph. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseGraph (vx_graph *graph)
	Releases a reference to a graph. The object may not be garbage collected until its total reference count is zero. Once the reference count is zero, all node references in the graph are automatically released as well. Releasing the graph will only release the nodes if the nodes were not previously released by the application. Data referenced by those nodes may not be released as the user may still have references to the data. More...
VX_API_ENTRY vx_status VX_API_CALL	vxVerifyGraph (vx_graph graph)
	Verifies the state of the graph before it is executed. This is useful to catch programmer errors and contract errors. If not verified, the graph verifies before being processed. More...
VX_API_ENTRY vx_status VX_API_CALL	vxProcessGraph (vx_graph graph)
	This function causes the synchronous processing of a graph. If the graph has not been verified, then the implementation verifies the graph immediately. If verification fails this function returns a status identical to what vxVerifyGraph would return. After the graph verfies successfully then processing occurs. If the graph was previously verified via vxVerifyGraph or vxProcessGraph then the graph is processed. This function blocks until the graph is completed. More...
VX_API_ENTRY vx_status VX_API_CALL	vxScheduleGraph (vx_graph graph)
	Schedules a graph for future execution. If the graph has not been verified, then the implementation verifies the graph immediately. If verification fails this function returns a status identical to what vxVerifyGraph would return. After the graph verfies successfully then processing occurs. If the graph was previously verified via vxVerifyGraph or vxProcessGraph then the graph is processed. More...
VX_API_ENTRY vx_status VX_API_CALL	vxWaitGraph (vx_graph graph)
	Waits for a specific graph to complete. If the graph has been scheduled multiple times since the last call to vxWaitGraph, then vxWaitGraph returns only when the last scheduled execution completes. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryGraph (vx_graph graph, vx_enum attribute, void *ptr, vx_size size)
	Allows the user to query attributes of the Graph. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetGraphAttribute (vx_graph graph, vx_enum attribute, const void *ptr, vx_size size)
	Allows the attributes of the Graph to be set to the provided value. More...
VX_API_ENTRY vx_status VX_API_CALL	vxAddParameterToGraph (vx_graph graph, vx_parameter parameter)
	Adds the given parameter extracted from a vx_node to the graph. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetGraphParameterByIndex (vx_graph graph, vx_uint32 index, vx_reference value)
	Sets a reference to the parameter on the graph. The implementation must set this parameter on the originating node as well. More...
VX_API_ENTRY vx_parameter VX_API_CALL	vxGetGraphParameterByIndex (vx_graph graph, vx_uint32 index)
	Retrieves a vx_parameter from a vx_graph. More...
VX_API_ENTRY vx_bool VX_API_CALL	vxIsGraphVerified (vx_graph graph)
	Returns a Boolean to indicate the state of graph verification. More...
VX_API_ENTRY vx_node VX_API_CALL	vxCreateGenericNode (vx_graph graph, vx_kernel kernel)
	Creates a reference to a node object for a given kernel. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryNode (vx_node node, vx_enum attribute, void *ptr, vx_size size)
	Allows a user to query information out of a node. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetNodeAttribute (vx_node node, vx_enum attribute, const void *ptr, vx_size size)
	Allows a user to set attribute of a node before Graph Validation. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseNode (vx_node *node)
	Releases a reference to a Node object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxRemoveNode (vx_node *node)
	Removes a Node from its parent Graph and releases it. More...
VX_API_ENTRY vx_status VX_API_CALL	vxAssignNodeCallback (vx_node node, vx_nodecomplete_f callback)
	Assigns a callback to a node. If a callback already exists in this node, this function must return an error and the user may clear the callback by passing a NULL pointer as the callback. More...
VX_API_ENTRY vx_nodecomplete_f VX_API_CALL	vxRetrieveNodeCallback (vx_node node)
	Retrieves the current node callback function pointer set on the node. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetNodeTarget (vx_node node, vx_enum target_enum, const char *target_string)
	Sets the node target to the provided value. A success invalidates the graph that the node belongs to (vxVerifyGraph must be called before the next execution) More...
VX_API_ENTRY vx_status VX_API_CALL	vxReplicateNode (vx_graph graph, vx_node first_node, vx_bool replicate[], vx_uint32 number_of_parameters)
	Creates replicas of the same node first_node to process a set of objects stored in vx_pyramid or vx_object_array. first_node needs to have as parameter levels 0 of a vx_pyramid or the index 0 of a vx_object_array. Replica nodes are not accessible by the application through any means. An application request for removal of first_node from the graph will result in removal of all replicas. Any change of parameter or attribute of first_node will be propagated to the replicas. vxVerifyGraph shall enforce consistency of parameters and attributes in the replicas. More...
VX_API_ENTRY vx_parameter VX_API_CALL	vxGetParameterByIndex (vx_node node, vx_uint32 index)
	Retrieves a vx_parameter from a vx_node. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseParameter (vx_parameter *param)
	Releases a reference to a parameter object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetParameterByIndex (vx_node node, vx_uint32 index, vx_reference value)
	Sets the specified parameter data for a kernel on the node. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetParameterByReference (vx_parameter parameter, vx_reference value)
	Associates a parameter reference and a data reference with a kernel on a node. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryParameter (vx_parameter parameter, vx_enum attribute, void *ptr, vx_size size)
	Allows the client to query a parameter to determine its meta-information. More...
VX_API_ENTRY vx_scalar VX_API_CALL	vxCreateScalar (vx_context context, vx_enum data_type, const void *ptr)
	Creates a reference to a scalar object. Also see sub_node_parameters. More...
VX_API_ENTRY vx_scalar VX_API_CALL	vxCreateScalarWithSize (vx_context context, vx_enum data_type, const void *ptr, vx_size size)
	Creates a reference to a scalar object. Also see sub_node_parameters. More...
VX_API_ENTRY vx_scalar VX_API_CALL	vxCreateVirtualScalar (vx_graph graph, vx_enum data_type)
	Creates an opaque reference to a scalar object with no direct user access. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseScalar (vx_scalar *scalar)
	Releases a reference to a scalar object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryScalar (vx_scalar scalar, vx_enum attribute, void *ptr, vx_size size)
	Queries attributes from a scalar. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyScalar (vx_scalar scalar, void *user_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy from/into a scalar object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyScalarWithSize (vx_scalar scalar, vx_size size, void *user_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy from/into a scalar object with size. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryReference (vx_reference ref, vx_enum attribute, void *ptr, vx_size size)
	Queries any reference type for some basic information like count or type. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseReference (vx_reference *ref_ptr)
	Releases a reference. The reference may potentially refer to multiple OpenVX objects of different types. This function can be used instead of calling a specific release function for each individual object type (e.g. vxRelease<object>). The object will not be destroyed until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxRetainReference (vx_reference ref)
	Increments the reference counter of an object This function is used to express the fact that the OpenVX object is referenced multiple times by an application. Each time this function is called for an object, the application will need to release the object one additional time before it can be destructed. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetReferenceName (vx_reference ref, const vx_char *name)
	Name a reference. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryDelay (vx_delay delay, vx_enum attribute, void *ptr, vx_size size)
	Queries a vx_delay object attribute. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseDelay (vx_delay *delay)
	Releases a reference to a delay object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_delay VX_API_CALL	vxCreateDelay (vx_context context, vx_reference exemplar, vx_size num_slots)
	Creates a Delay object. More...
VX_API_ENTRY vx_reference VX_API_CALL	vxGetReferenceFromDelay (vx_delay delay, vx_int32 index)
	Retrieves a reference to a delay slot object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxAgeDelay (vx_delay delay)
	Shifts the internal delay ring by one. More...
VX_API_ENTRY vx_status VX_API_CALL	vxRegisterAutoAging (vx_graph graph, vx_delay delay)
	Register a delay for auto-aging. More...
VX_API_ENTRY void VX_API_CALL	vxAddLogEntry (vx_reference ref, vx_status status, const char *message,...)
	Adds a line to the log. More...
VX_API_ENTRY void VX_API_CALL	vxRegisterLogCallback (vx_context context, vx_log_callback_f callback, vx_bool reentrant)
	Registers a callback facility to the OpenVX implementation to receive error logs. More...
VX_API_ENTRY vx_lut VX_API_CALL	vxCreateLUT (vx_context context, vx_enum data_type, vx_size count)
	Creates LUT object of a given type. The value of VX_LUT_OFFSET is equal to 0 for data_type = VX_TYPE_UINT8, and (vx_uint32)(count/2) for VX_TYPE_INT16. More...
VX_API_ENTRY vx_lut VX_API_CALL	vxCreateVirtualLUT (vx_graph graph, vx_enum data_type, vx_size count)
	Creates an opaque reference to a LUT object with no direct user access. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseLUT (vx_lut *lut)
	Releases a reference to a LUT object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryLUT (vx_lut lut, vx_enum attribute, void *ptr, vx_size size)
	Queries attributes from a LUT. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyLUT (vx_lut lut, void *user_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy from/into a LUT object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxMapLUT (vx_lut lut, vx_map_id *map_id, void **ptr, vx_enum usage, vx_enum mem_type, vx_bitfield flags)
	Allows the application to get direct access to LUT object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxUnmapLUT (vx_lut lut, vx_map_id map_id)
	Unmap and commit potential changes to LUT object that was previously mapped. Unmapping a LUT invalidates the memory location from which the LUT data could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior. More...
VX_API_ENTRY vx_distribution VX_API_CALL	vxCreateDistribution (vx_context context, vx_size numBins, vx_int32 offset, vx_uint32 range)
	Creates a reference to a 1D Distribution of a consecutive interval [offset, offset + range - 1] defined by a start offset and valid range, divided equally into numBins parts. More...
VX_API_ENTRY vx_distribution VX_API_CALL	vxCreateVirtualDistribution (vx_graph graph, vx_size numBins, vx_int32 offset, vx_uint32 range)
	Creates an opaque reference to a 1D Distribution object without direct user access. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseDistribution (vx_distribution *distribution)
	Releases a reference to a distribution object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryDistribution (vx_distribution distribution, vx_enum attribute, void *ptr, vx_size size)
	Queries a Distribution object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyDistribution (vx_distribution distribution, void *user_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy from/into a distribution object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxMapDistribution (vx_distribution distribution, vx_map_id *map_id, void **ptr, vx_enum usage, vx_enum mem_type, vx_bitfield flags)
	Allows the application to get direct access to distribution object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxUnmapDistribution (vx_distribution distribution, vx_map_id map_id)
	Unmap and commit potential changes to distribution object that was previously mapped. Unmapping a distribution invalidates the memory location from which the distribution data could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior. More...
VX_API_ENTRY vx_threshold VX_API_CALL	vxCreateThresholdForImage (vx_context context, vx_enum thresh_type, vx_df_image input_format, vx_df_image output_format)
	Creates a threshold object and returns a reference to it. More...
VX_API_ENTRY vx_threshold VX_API_CALL	vxCreateVirtualThresholdForImage (vx_graph graph, vx_enum thresh_type, vx_df_image input_format, vx_df_image output_format)
	Creates an opaque reference to a threshold object without direct user access. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyThresholdValue (vx_threshold thresh, vx_pixel_value_t *value_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy the thresholding value from/into a threshold object with type VX_THRESHOLD_TYPE_BINARY. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyThresholdRange (vx_threshold thresh, vx_pixel_value_t *lower_value_ptr, vx_pixel_value_t *upper_value_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy thresholding values from/into a threshold object with type VX_THRESHOLD_TYPE_RANGE. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyThresholdOutput (vx_threshold thresh, vx_pixel_value_t *true_value_ptr, vx_pixel_value_t *false_value_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy the true and false output values from/into a threshold object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseThreshold (vx_threshold *thresh)
	Releases a reference to a threshold object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetThresholdAttribute (vx_threshold thresh, vx_enum attribute, const void *ptr, vx_size size)
	Sets attributes on the threshold object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryThreshold (vx_threshold thresh, vx_enum attribute, void *ptr, vx_size size)
	Queries an attribute on the threshold object. More...
VX_API_ENTRY vx_matrix VX_API_CALL	vxCreateMatrix (vx_context c, vx_enum data_type, vx_size columns, vx_size rows)
	Creates a reference to a matrix object. More...
VX_API_ENTRY vx_matrix VX_API_CALL	vxCreateVirtualMatrix (vx_graph graph, vx_enum data_type, vx_size columns, vx_size rows)
	Creates an opaque reference to a matrix object without direct user access. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseMatrix (vx_matrix *mat)
	Releases a reference to a matrix object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryMatrix (vx_matrix mat, vx_enum attribute, void *ptr, vx_size size)
	Queries an attribute on the matrix object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyMatrix (vx_matrix matrix, void *user_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy from/into a matrix object. More...
VX_API_ENTRY vx_matrix VX_API_CALL	vxCreateMatrixFromPattern (vx_context context, vx_enum pattern, vx_size columns, vx_size rows)
	Creates a reference to a matrix object from a boolean pattern. More...
VX_API_ENTRY vx_matrix VX_API_CALL	vxCreateMatrixFromPatternAndOrigin (vx_context context, vx_enum pattern, vx_size columns, vx_size rows, vx_size origin_col, vx_size origin_row)
	Creates a reference to a matrix object from a boolean pattern, with a user-specified origin. More...
VX_API_ENTRY vx_convolution VX_API_CALL	vxCreateConvolution (vx_context context, vx_size columns, vx_size rows)
	Creates a reference to a convolution matrix object. More...
VX_API_ENTRY vx_convolution VX_API_CALL	vxCreateVirtualConvolution (vx_graph graph, vx_size columns, vx_size rows)
	Creates an opaque reference to a convolution matrix object without direct user access. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseConvolution (vx_convolution *conv)
	Releases the reference to a convolution matrix. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryConvolution (vx_convolution conv, vx_enum attribute, void *ptr, vx_size size)
	Queries an attribute on the convolution matrix object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetConvolutionAttribute (vx_convolution conv, vx_enum attribute, const void *ptr, vx_size size)
	Sets attributes on the convolution object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyConvolutionCoefficients (vx_convolution conv, void *user_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy coefficients from/into a convolution object. More...
VX_API_ENTRY vx_pyramid VX_API_CALL	vxCreatePyramid (vx_context context, vx_size levels, vx_float32 scale, vx_uint32 width, vx_uint32 height, vx_df_image format)
	Creates a reference to a pyramid object of the supplied number of levels. More...
VX_API_ENTRY vx_pyramid VX_API_CALL	vxCreateVirtualPyramid (vx_graph graph, vx_size levels, vx_float32 scale, vx_uint32 width, vx_uint32 height, vx_df_image format)
	Creates a reference to a virtual pyramid object of the supplied number of levels. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleasePyramid (vx_pyramid *pyr)
	Releases a reference to a pyramid object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryPyramid (vx_pyramid pyr, vx_enum attribute, void *ptr, vx_size size)
	Queries an attribute from an image pyramid. More...
VX_API_ENTRY vx_image VX_API_CALL	vxGetPyramidLevel (vx_pyramid pyr, vx_uint32 index)
	Retrieves a level of the pyramid as a vx_image, which can be used elsewhere in OpenVX. A call to vxReleaseImage is necessary to release an image for each call of vxGetPyramidLevel. More...
VX_API_ENTRY vx_remap VX_API_CALL	vxCreateRemap (vx_context context, vx_uint32 src_width, vx_uint32 src_height, vx_uint32 dst_width, vx_uint32 dst_height)
	Creates a remap table object. More...
VX_API_ENTRY vx_remap VX_API_CALL	vxCreateVirtualRemap (vx_graph graph, vx_uint32 src_width, vx_uint32 src_height, vx_uint32 dst_width, vx_uint32 dst_height)
	Creates an opaque reference to a remap table object without direct user access. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseRemap (vx_remap *table)
	Releases a reference to a remap table object. The object may not be garbage collected until its total reference count is zero. More...
VX_API_ENTRY vx_status VX_API_CALL	vxMapRemapPatch (vx_remap remap, const vx_rectangle_t *rect, vx_map_id *map_id, vx_size *stride_y, void **ptr, vx_enum coordinate_type, vx_enum usage, vx_enum mem_type)
	Allows the application to get direct access to a rectangular patch of a remap object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxUnmapRemapPatch (vx_remap remap, vx_map_id map_id)
	Unmap and commit potential changes to a remap object patch that was previously mapped. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyRemapPatch (vx_remap remap, const vx_rectangle_t *rect, vx_size user_stride_y, void *user_ptr, vx_enum user_coordinate_type, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy a rectangular patch from/into a remap object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryRemap (vx_remap table, vx_enum attribute, void *ptr, vx_size size)
	Queries attributes from a Remap table. More...
VX_API_ENTRY vx_array VX_API_CALL	vxCreateArray (vx_context context, vx_enum item_type, vx_size capacity)
	Creates a reference to an Array object. More...
VX_API_ENTRY vx_array VX_API_CALL	vxCreateVirtualArray (vx_graph graph, vx_enum item_type, vx_size capacity)
	Creates an opaque reference to a virtual Array with no direct user access. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseArray (vx_array *arr)
	Releases a reference of an Array object. The object may not be garbage collected until its total reference count is zero. After returning from this function the reference is zeroed. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryArray (vx_array arr, vx_enum attribute, void *ptr, vx_size size)
	Queries the Array for some specific information. More...
VX_API_ENTRY vx_status VX_API_CALL	vxAddArrayItems (vx_array arr, vx_size count, const void *ptr, vx_size stride)
	Adds items to the Array. More...
VX_API_ENTRY vx_status VX_API_CALL	vxTruncateArray (vx_array arr, vx_size new_num_items)
	Truncates an Array (remove items from the end). More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyArrayRange (vx_array array, vx_size range_start, vx_size range_end, vx_size user_stride, void *user_ptr, vx_enum usage, vx_enum user_mem_type)
	Allows the application to copy a range from/into an array object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxMapArrayRange (vx_array array, vx_size range_start, vx_size range_end, vx_map_id *map_id, vx_size *stride, void **ptr, vx_enum usage, vx_enum mem_type, vx_uint32 flags)
	Allows the application to get direct access to a range of an array object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxUnmapArrayRange (vx_array array, vx_map_id map_id)
	Unmap and commit potential changes to an array object range that was previously mapped. Unmapping an array range invalidates the memory location from which the range could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior. More...
VX_API_ENTRY vx_object_array VX_API_CALL	vxCreateObjectArray (vx_context context, vx_reference exemplar, vx_size count)
	Creates a reference to an ObjectArray of count objects. More...
VX_API_ENTRY vx_object_array VX_API_CALL	vxCreateVirtualObjectArray (vx_graph graph, vx_reference exemplar, vx_size count)
	Creates an opaque reference to a virtual ObjectArray with no direct user access. More...
VX_API_ENTRY vx_reference VX_API_CALL	vxGetObjectArrayItem (vx_object_array arr, vx_uint32 index)
	Retrieves the reference to the OpenVX Object in location index of the ObjectArray. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseObjectArray (vx_object_array *arr)
	Releases a reference of an ObjectArray object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryObjectArray (vx_object_array arr, vx_enum attribute, void *ptr, vx_size size)
	Queries an atribute from the ObjectArray. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetMetaFormatAttribute (vx_meta_format meta, vx_enum attribute, const void *ptr, vx_size size)
	This function allows a user to set the attributes of a vx_meta_format object in a kernel output validator. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSetMetaFormatFromReference (vx_meta_format meta, vx_reference exemplar)
	Set a meta format object from an exemplar data object reference. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryMetaFormatAttribute (vx_meta_format meta, vx_enum attribute, void *ptr, vx_size size)
	This function allows a user to query the attributes of a vx_meta_format object in a kernel parameter. More...
VX_API_ENTRY vx_tensor VX_API_CALL	vxCreateTensor (vx_context context, vx_size number_of_dims, const vx_size *dims, vx_enum data_type, vx_int8 fixed_point_position)
	Creates an opaque reference to a tensor data buffer. More...
VX_API_ENTRY vx_object_array VX_API_CALL	vxCreateImageObjectArrayFromTensor (vx_tensor tensor, const vx_rectangle_t *rect, vx_size array_size, vx_size jump, vx_df_image image_format)
	Creates an array of images into the multi-dimension data, this can be adjacent 2D images or not depending on the stride value. The stride value is representing bytes in the third dimension. The OpenVX image object that points to a three dimension data and access it as an array of images. This has to be portion of the third lowest dimension, and the stride correspond to that third dimension. The returned Object array is an array of images. Where the image data is pointing to a specific memory in the input tensor. More...
VX_API_ENTRY vx_tensor VX_API_CALL	vxCreateTensorFromView (vx_tensor tensor, vx_size number_of_dims, const vx_size *view_start, const vx_size *view_end)
	Creates a tensor data from another tensor data given a view. This second reference refers to the data in the original tensor data. Updates to this tensor data updates the parent tensor data. The view must be defined within the dimensions of the parent tensor data. More...
VX_API_ENTRY vx_tensor VX_API_CALL	vxCreateVirtualTensor (vx_graph graph, vx_size number_of_dims, const vx_size *dims, vx_enum data_type, vx_int8 fixed_point_position)
	Creates an opaque reference to a tensor data buffer with no direct user access. This function allows setting the tensor data dimensions or data format. More...
VX_API_ENTRY vx_tensor VX_API_CALL	vxCreateTensorFromHandle (vx_context context, vx_size number_of_dims, const vx_size *dims, vx_enum data_type, vx_int8 fixed_point_position, const vx_size *stride, void *ptr, vx_enum memory_type)
	Creates a reference to an tensor object that was externally allocated. More...
VX_API_ENTRY vx_status VX_API_CALL	vxSwapTensorHandle (vx_tensor tensor, void *new_ptr, void **prev_ptr)
	Swaps the tensor handle of an tensor previously created from handle. More...
VX_API_ENTRY vx_status VX_API_CALL	vxCopyTensorPatch (vx_tensor tensor, vx_size number_of_dims, const vx_size *view_start, const vx_size *view_end, const vx_size *user_stride, void *user_ptr, vx_enum usage, vx_enum user_memory_type)
	Allows the application to copy a view patch from/into an tensor object . More...
VX_API_ENTRY vx_status VX_API_CALL	vxMapTensorPatch (vx_tensor tensor, vx_size number_of_dims, const vx_size *view_start, const vx_size *view_end, vx_map_id *map_id, vx_size *stride, void **ptr, vx_enum usage, vx_enum mem_type)
	Allows the application to get direct access to a patch of tensor object. More...
VX_API_ENTRY vx_status VX_API_CALL	vxUnmapTensorPatch (vx_tensor tensor, const vx_map_id map_id)
	Unmap and commit potential changes to a tensor object patch that was previously mapped. Unmapping a tensor patch invalidates the memory location from which the patch could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior. More...
VX_API_ENTRY vx_status VX_API_CALL	vxQueryTensor (vx_tensor tensor, vx_enum attribute, void *ptr, vx_size size)
	Retrieves various attributes of a tensor data. More...
VX_API_ENTRY vx_status VX_API_CALL	vxReleaseTensor (vx_tensor *tensor)
	Releases a reference to a tensor data object. The object may not be garbage collected until its total reference count is zero. More...

Detailed Description

The API definition for OpenVX.

Macro Definition Documentation

◆ vxArrayItem

#define vxArrayItem	(		type,
			ptr,
			index,
			stride
	)		(*(type *)(vxFormatArrayPointer((ptr), (index), (stride))))

Allows access to an array item as a typecast pointer deference.

Parameters

[in]	type	The type of the item to access.
[in]	ptr	The base pointer for the array range.
[in]	index	The index of the element, not byte, to access.
[in]	stride	The 'number of bytes' between the beginning of two consecutive elements.

◆ vxFormatArrayPointer

#define vxFormatArrayPointer	(		ptr,
			index,
			stride
	)		(&(((vx_uint8*)(ptr))[(index) * (stride)]))

Accesses a specific indexed element in an array.

Parameters

[in]	ptr	The base pointer for the array range.
[in]	index	The index of the element, not byte, to access.
[in]	stride	The 'number of bytes' between the beginning of two consecutive elements.

Function Documentation

◆ vxAddArrayItems()

VX_API_ENTRY vx_status VX_API_CALL vxAddArrayItems	(	vx_array	arr,
		vx_size	count,
		const void *	ptr,
		vx_size	stride
	)

Adds items to the Array.

This function increases the container size.

By default, the function does not reallocate memory, so if the container is already full (number of elements is equal to capacity) or it doesn't have enough space, the function returns VX_FAILURE error code.

Parameters

[in]	arr	The reference to the Array.
[in]	count	The total number of elements to insert.
[in]	ptr	The location from which to read the input values.
[in]	stride	The number of bytes between the beginning of two consecutive elements.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	arr is not a valid vx_array reference.
VX_FAILURE	If the Array is full.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

◆ vxAddLogEntry()

VX_API_ENTRY void VX_API_CALL vxAddLogEntry	(	vx_reference	ref,
		vx_status	status,
		const char *	message,
			...
	)

Adds a line to the log.

Parameters

[in]	ref	The reference to add the log entry against. Some valid value must be provided.
[in]	status	The status code. VX_SUCCESS status entries are ignored and not added.
[in]	message	The human readable message to add to the log.
[in]	...	a list of variable arguments to the message.

Note

Messages may not exceed VX_MAX_LOG_MESSAGE_LEN bytes and will be truncated in the log if they exceed this limit.

◆ vxAddParameterToGraph()

VX_API_ENTRY vx_status VX_API_CALL vxAddParameterToGraph	(	vx_graph	graph,
		vx_parameter	parameter
	)

Adds the given parameter extracted from a vx_node to the graph.

Parameters

[in]	graph	The graph reference that contains the node.
[in]	parameter	The parameter reference to add to the graph from the node.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Parameter added to Graph; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference or parameter is not a valid vx_parameter reference.
VX_ERROR_INVALID_PARAMETERS	The parameter is of a node not in this graph.

◆ vxAddParameterToKernel()

VX_API_ENTRY vx_status VX_API_CALL vxAddParameterToKernel	(	vx_kernel	kernel,
		vx_uint32	index,
		vx_enum	dir,
		vx_enum	data_type,
		vx_enum	state
	)

Allows users to set the signatures of the custom kernel.

Parameters

[in]	kernel	The reference to the kernel added with vxAddUserKernel.
[in]	index	The index of the parameter to add.
[in]	dir	The direction of the parameter. This must be either VX_INPUT or VX_OUTPUT.
[in]	data_type	The type of parameter. This must be a value from vx_type_e.
[in]	state	The state of the parameter (required or not). This must be a value from vx_parameter_state_e.

Returns

A vx_status_e enumerated value.

Return values

VX_SUCCESS	Parameter is successfully set on kernel; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	kernel is not a valid vx_kernel reference.
VX_ERROR_INVALID_PARAMETERS	If the parameter is not valid for any reason.

Precondition

vxAddUserKernel

◆ vxAddUserKernel()

VX_API_ENTRY vx_kernel VX_API_CALL vxAddUserKernel	(	vx_context	context,
		const vx_char	name[VX_MAX_KERNEL_NAME],
		vx_enum	enumeration,
		vx_kernel_f	func_ptr,
		vx_uint32	numParams,
		vx_kernel_validate_f	validate,
		vx_kernel_initialize_f	init,
		vx_kernel_deinitialize_f	deinit
	)

Allows users to add custom kernels to a context at run-time.

Parameters

[in]	context	The reference to the context the kernel must be added to.
[in]	name	The string to use to match the kernel.
[in]	enumeration	The enumerated value of the kernel to be used by clients.
[in]	func_ptr	The process-local function pointer to be invoked.
[in]	numParams	The number of parameters for this kernel.
[in]	validate	The pointer to vx_kernel_validate_f, which validates parameters to this kernel.
[in]	init	The kernel initialization function.
[in]	deinit	The kernel de-initialization function.

Returns

A vx_kernel reference. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxAgeDelay()

VX_API_ENTRY vx_status VX_API_CALL vxAgeDelay

(

vx_delay

delay

)

Shifts the internal delay ring by one.

This function performs a shift of the internal delay ring by one. This means that, the data originally at index 0 move to index -1 and so forth until index \( -count+1 \). The data originally at index \( -count+1 \) move to index 0. Here \( count \) is the number of slots in delay ring. When a delay is aged, any graph making use of this delay (delay object itself or data objects in delay slots) gets its data automatically updated accordingly.

Parameters

[in]

delay

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Delay was aged; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	delay is not a valid vx_delay reference.

◆ vxAllocateUserKernelId()

VX_API_ENTRY vx_status VX_API_CALL vxAllocateUserKernelId	(	vx_context	context,
		vx_enum *	pKernelEnumId
	)

Allocates and registers user-defined kernel enumeration to a context. The allocated enumeration is from available pool of 4096 enumerations reserved for dynamic allocation from VX_KERNEL_BASE(VX_ID_USER,0).

Parameters

[in]	context	The reference to the implementation context.
[out]	pKernelEnumId	pointer to return vx_enum for user-defined kernel.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	If the context is not a valid vx_context reference.
VX_ERROR_NO_RESOURCES	The enumerations has been exhausted.

◆ vxAllocateUserKernelLibraryId()

VX_API_ENTRY vx_status VX_API_CALL vxAllocateUserKernelLibraryId	(	vx_context	context,
		vx_enum *	pLibraryId
	)

Allocates and registers user-defined kernel library ID to a context.

The allocated library ID is from available pool of library IDs (1..255) reserved for dynamic allocation. The returned libraryId can be used by user-kernel library developer to specify individual kernel enum IDs in a header file, shown below:

#define MY_KERNEL_ID1(libraryId) (VX_KERNEL_BASE(VX_ID_USER,libraryId) + 0);

#define MY_KERNEL_ID2(libraryId) (VX_KERNEL_BASE(VX_ID_USER,libraryId) + 1);

#define MY_KERNEL_ID3(libraryId) (VX_KERNEL_BASE(VX_ID_USER,libraryId) + 2);

Parameters

[in]	context	The reference to the implementation context.
[out]	pLibraryId	pointer to vx_enum for user-kernel libraryId.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_NO_RESOURCES	The enumerations has been exhausted.

◆ vxAssignNodeCallback()

VX_API_ENTRY vx_status VX_API_CALL vxAssignNodeCallback	(	vx_node	node,
		vx_nodecomplete_f	callback
	)

Assigns a callback to a node. If a callback already exists in this node, this function must return an error and the user may clear the callback by passing a NULL pointer as the callback.

Parameters

[in]	node	The reference to the node.
[in]	callback	The callback to associate with completion of this specific node.

Warning

This must be used with extreme caution as it can ruin optimizations in the power/performance efficiency of a graph.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Callback assigned; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	node is not a valid vx_node reference.

◆ vxCopyArrayRange()

VX_API_ENTRY vx_status VX_API_CALL vxCopyArrayRange	(	vx_array	array,
		vx_size	range_start,
		vx_size	range_end,
		vx_size	user_stride,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy a range from/into an array object.

Parameters

[in]	array	The reference to the array object that is the source or the destination of the copy.
[in]	range_start	The index of the first item of the array object to copy.
[in]	range_end	The index of the item following the last item of the array object to copy. (range_end range_start) items are copied from index range_start included. The range must be within the bounds of the array: 0 <= range_start < range_end <= number of items in the array.
[in]	user_stride	The number of bytes between the beginning of two consecutive items in the user memory pointed by user_ptr. The layout of the user memory must follow an item major order: user_stride >= element size in bytes.
[in]	user_ptr	The address of the memory location where to store the requested data if the copy was requested in read mode, or from where to get the data to store into the array object if the copy was requested in write mode. The accessible memory must be large enough to contain the specified range with the specified stride: accessible memory in bytes >= (range_end range_start) * user_stride.
[in]	usage	This declares the effect of the copy with regard to the array object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data are copied from the array object into the user memory. VX_WRITE_ONLY means that data are copied into the array object from the user memory.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_OPTIMIZED_AWAY	This is a reference to a virtual array that cannot be accessed by the application.
VX_ERROR_INVALID_REFERENCE	array is not a valid vx_array reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyConvolutionCoefficients()

VX_API_ENTRY vx_status VX_API_CALL vxCopyConvolutionCoefficients	(	vx_convolution	conv,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy coefficients from/into a convolution object.

Parameters

[in]	conv	The reference to the convolution object that is the source or the destination of the copy.
[in]	user_ptr	The address of the memory location where to store the requested coefficient data if the copy was requested in read mode, or from where to get the coefficient data to store into the convolution object if the copy was requested in write mode. In the user memory, the convolution coefficient data is structured as a row-major 2D array with elements of the type corresponding to VX_TYPE_CONVOLUTION, with a number of rows corresponding to VX_CONVOLUTION_ROWS and a number of columns corresponding to VX_CONVOLUTION_COLUMNS. The accessible memory must be large enough to contain this 2D array: accessible memory in bytes >= sizeof(data_element) * rows * columns.
[in]	usage	This declares the effect of the copy with regard to the convolution object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data are copied from the convolution object into the user memory. VX_WRITE_ONLY means that data are copied into the convolution object from the user memory.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	conv is not a valid vx_convolution reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyDistribution()

VX_API_ENTRY vx_status VX_API_CALL vxCopyDistribution	(	vx_distribution	distribution,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy from/into a distribution object.

Parameters

[in]	distribution	The reference to the distribution object that is the source or the destination of the copy.
[in]	user_ptr	The address of the memory location where to store the requested data if the copy was requested in read mode, or from where to get the data to store into the distribution object if the copy was requested in write mode. In the user memory, the distribution is represented as a vx_uint32 array with a number of elements equal to the value returned via VX_DISTRIBUTION_BINS. The accessible memory must be large enough to contain this vx_uint32 array: accessible memory in bytes >= sizeof(vx_uint32) * num_bins.
[in]	usage	This declares the effect of the copy with regard to the distribution object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data are copied from the distribution object into the user memory. VX_WRITE_ONLY means that data are copied into the distribution object from the user memory.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	distribution is not a valid vx_distribution reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyImagePatch()

VX_API_ENTRY vx_status VX_API_CALL vxCopyImagePatch	(	vx_image	image,
		const vx_rectangle_t *	image_rect,
		vx_uint32	image_plane_index,
		const vx_imagepatch_addressing_t *	user_addr,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy a rectangular patch from/into an image object plane.

Parameters

[in]	image	The reference to the image object that is the source or the destination of the copy.
[in]	image_rect	The coordinates of the image patch. The patch must be within the bounds of the image. (start_x, start_y) gives the coordinates of the topleft pixel inside the patch, while (end_x, end_y) gives the coordinates of the bottomright element out of the patch. Must be 0 <= start < end <= number of pixels in the image dimension.
[in]	image_plane_index	The plane index of the image object that is the source or the destination of the patch copy.
[in]	user_addr	The address of a structure describing the layout of the user memory location pointed by user_ptr. In the structure, only dim_x, dim_y, stride_x and stride_y fields must be provided, other fields are ignored by the function. The layout of the user memory must follow a row major order: stride_x >= pixel size in bytes, and stride_y >= stride_x * dim_x.
[in]	user_ptr	The address of the memory location where to store the requested data if the copy was requested in read mode, or from where to get the data to store into the image object if the copy was requested in write mode. The accessible memory must be large enough to contain the specified patch with the specified layout: accessible memory in bytes >= (end_y - start_y) * stride_y.
[in]	usage	This declares the effect of the copy with regard to the image object using the vx_accessor_e enumeration. For uniform images, only VX_READ_ONLY is supported. For other images, Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data is copied from the image object into the application memory VX_WRITE_ONLY means that data is copied into the image object from the application memory
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_OPTIMIZED_AWAY	This is a reference to a virtual image that cannot be accessed by the application.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Note

The application may ask for data outside the bounds of the valid region, but such data has an undefined value.

Some special restrictions apply to VX_DF_IMAGE_U1 images.

◆ vxCopyLUT()

VX_API_ENTRY vx_status VX_API_CALL vxCopyLUT	(	vx_lut	lut,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy from/into a LUT object.

Parameters

[in]	lut	The reference to the LUT object that is the source or the destination of the copy.
[in]	user_ptr	The address of the memory location where to store the requested data if the copy was requested in read mode, or from where to get the data to store into the LUT object if the copy was requested in write mode. In the user memory, the LUT is represented as a array with elements of the type corresponding to VX_LUT_TYPE, and with a number of elements equal to the value returned via VX_LUT_COUNT. The accessible memory must be large enough to contain this array: accessible memory in bytes >= sizeof(data_element) * count.
[in]	usage	This declares the effect of the copy with regard to the LUT object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data are copied from the LUT object into the user memory. VX_WRITE_ONLY means that data are copied into the LUT object from the user memory.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	lut is not a valid vx_lut reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyMatrix()

VX_API_ENTRY vx_status VX_API_CALL vxCopyMatrix	(	vx_matrix	matrix,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy from/into a matrix object.

Parameters

[in]	matrix	The reference to the matrix object that is the source or the destination of the copy.
[in]	user_ptr	The address of the memory location where to store the requested data if the copy was requested in read mode, or from where to get the data to store into the matrix object if the copy was requested in write mode. In the user memory, the matrix is structured as a row-major 2D array with elements of the type corresponding to VX_MATRIX_TYPE, with a number of rows corresponding to VX_MATRIX_ROWS and a number of columns corresponding to VX_MATRIX_COLUMNS. The accessible memory must be large enough to contain this 2D array: accessible memory in bytes >= sizeof(data_element) * rows * columns.
[in]	usage	This declares the effect of the copy with regard to the matrix object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data are copied from the matrix object into the user memory. VX_WRITE_ONLY means that data are copied into the matrix object from the user memory.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	matrix is not a valid vx_matrix reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyRemapPatch()

VX_API_ENTRY vx_status VX_API_CALL vxCopyRemapPatch	(	vx_remap	remap,
		const vx_rectangle_t *	rect,
		vx_size	user_stride_y,
		void *	user_ptr,
		vx_enum	user_coordinate_type,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy a rectangular patch from/into a remap object.

The patch is specified within the destination dimensions and its data provide the corresponding coordinate within the source dimensions. The patch in user memory is a 2D array of elements of the type associated with the coordinate_type parameter (i.e., vx_coordinates2df_t for VX_TYPE_COORDINATES2DF). The memory layout of this array follows a row-major order where rows are compact (without any gap between elements), and where the potential padding after each line is determined by the user_stride_y parameter.

Parameters

[in]	remap	The reference to the remap object that is the source or the destination of the patch copy.
[in]	rect	The coordinates of remap patch. The patch must be specified within the bounds of the remap destination dimensions (VX_REMAP_DESTINATION_WIDTH x VX_REMAP_DESTINATION_HEIGHT). (start_x, start_y) gives the coordinate of the topleft element inside the patch, while (end_x, end_y) gives the coordinate of the bottomright element out of the patch.
[in]	user_stride_y	The difference between the address of the first element of two successive lines of the remap patch in user memory (pointed by user_ptr). The layout of the user memory must follow a row major order and user_stride_y must follow the following rule : user_stride_y >= sizeof(<ELEMENT_TYPE>) * (rect->end_x - rect->start_x).
[in]	user_ptr	The address of the user memory location where to store the requested remap data if the copy was requested in read mode, or from where to get the remap data to store into the remap object if the copy was requested in write mode. user_ptr is the address of the the top-left element of the remap patch. The accessible user memory must be large enough to contain the specified patch with the specified layout: accessible memory in bytes >= (rect->end_y - rect->start_y) * user_stride_y.
[in]	user_coordinate_type	This declares the type of the source coordinate remap data in the user memory. It must be VX_TYPE_COORDINATES2DF.
[in]	usage	This declares the effect of the copy with regard to the remap object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data is copied from the remap object into the user memory pointer by user_ptr. The potential padding after each line in user memory will stay unchanged. VX_WRITE_ONLY means that data is copied into the remap object from the user memory.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the type of the memory pointer by user_ptr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	remap is not a valid vx_remap reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyScalar()

VX_API_ENTRY vx_status VX_API_CALL vxCopyScalar	(	vx_scalar	scalar,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy from/into a scalar object.

Parameters

[in]	scalar	The reference to the scalar object that is the source or the destination of the copy.
[in]	user_ptr	The address of the memory location where to store the requested data if the copy was requested in read mode, or from where to get the data to store into the scalar object if the copy was requested in write mode. In the user memory, the scalar is a variable of the type corresponding to VX_SCALAR_TYPE. The accessible memory must be large enough to contain this variable.
[in]	usage	This declares the effect of the copy with regard to the scalar object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data are copied from the scalar object into the user memory. VX_WRITE_ONLY means that data are copied into the scalar object from the user memory.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	scalar is not a valid vx_scalar reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyScalarWithSize()

VX_API_ENTRY vx_status VX_API_CALL vxCopyScalarWithSize	(	vx_scalar	scalar,
		vx_size	size,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy from/into a scalar object with size.

Parameters

[in]	scalar	The reference to the scalar object that is the source or the destination of the copy.
[in]	size	The size in bytes of the container to which user_ptr points.
[in]	user_ptr	The address of the memory location where to store the requested data if the copy was requested in read mode, or from where to get the data to store into the scalar object if the copy was requested in write mode. In the user memory, the scalar is a variable of the type corresponding to VX_SCALAR_TYPE. The accessible memory must be large enough to contain this variable.
[in]	usage	This declares the effect of the copy with regard to the scalar object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data are copied from the scalar object into the user memory. VX_WRITE_ONLY means that data are copied into the scalar object from the user memory.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_ERROR_INVALID_REFERENCE	The scalar reference is not actually a scalar reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyTensorPatch()

VX_API_ENTRY vx_status VX_API_CALL vxCopyTensorPatch	(	vx_tensor	tensor,
		vx_size	number_of_dims,
		const vx_size *	view_start,
		const vx_size *	view_end,
		const vx_size *	user_stride,
		void *	user_ptr,
		vx_enum	usage,
		vx_enum	user_memory_type
	)

Allows the application to copy a view patch from/into an tensor object .

Parameters

[in]	tensor	The reference to the tensor object that is the source or the destination of the copy.
[in]	number_of_dims	Number of patch dimension. Error return if 0 or greater than number of tensor dimensions. If smaller than number of tensor dimensions, the lower dimensions are assumed.
[in]	view_start	Array of patch start points in each dimension
[in]	view_end	Array of patch end points in each dimension
[in]	user_stride	Array of user memory strides in each dimension
[in]	user_ptr	The address of the memory location where to store the requested data if the copy was requested in read mode, or from where to get the data to store into the tensor object if the copy was requested in write mode. The accessible memory must be large enough to contain the specified patch with the specified layout: accessible memory in bytes >= (end[last_dimension] - start[last_dimension]) * stride[last_dimension]. The layout of the user memory must follow a row major order.
[in]	usage	This declares the effect of the copy with regard to the tensor object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that data is copied from the tensor object into the application memory VX_WRITE_ONLY means that data is copied into the tensor object from the application memory
[in]	user_memory_type	A vx_memory_type_e enumeration that specifies the memory type of the memory referenced by the user_addr.

Returns

A vx_status_e enumeration.

Return values

VX_ERROR_OPTIMIZED_AWAY	This is a reference to a virtual tensor that cannot be accessed by the application.
VX_ERROR_INVALID_REFERENCE	The tensor reference is not actually an tensor reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyThresholdOutput()

VX_API_ENTRY vx_status VX_API_CALL vxCopyThresholdOutput	(	vx_threshold	thresh,
		vx_pixel_value_t *	true_value_ptr,
		vx_pixel_value_t *	false_value_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy the true and false output values from/into a threshold object.

Parameters

[in]	thresh	The reference to the threshold object that is the source or the destination of the copy.
[in,out]	true_value_ptr	The address of the memory location where to store the true output value if the copy was requested in read mode, or from where to get the true output value to store into the threshold object if the copy was requested in write mode.
[in,out]	false_value_ptr	The address of the memory location where to store the false output value if the copy was requested in read mode, or from where to get the false output value to store into the threshold object if the copy was requested in write mode.
[in]	usage	This declares the effect of the copy with regard to the threshold object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that true and false output values are copied from the threshold object into the user memory. After the copy, only the field of (*true_value_ptr) and (*false_value_ptr) unions that corresponds to the output image format of the threshold object is meaningful. VX_WRITE_ONLY means the field of the (*true_value_ptr) and (*false_value_ptr) unions corresponding to the output format of the threshold object is copied into the threshold object.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the type of the memory referenced by true_value_ptr and false_value_ptr.

Returns

A vx_status_e enumeration.

Return values

VX_ERROR_INVALID_REFERENCE	The threshold reference is not actually a threshold reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyThresholdRange()

VX_API_ENTRY vx_status VX_API_CALL vxCopyThresholdRange	(	vx_threshold	thresh,
		vx_pixel_value_t *	lower_value_ptr,
		vx_pixel_value_t *	upper_value_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy thresholding values from/into a threshold object with type VX_THRESHOLD_TYPE_RANGE.

Parameters

[in]	thresh	The reference to the threshold object that is the source or the destination of the copy.
[in,out]	lower_value_ptr	The address of the memory location where to store the lower thresholding value if the copy was requested in read mode, or from where to get the lower thresholding value to store into the threshold object if the copy was requested in write mode.
[in,out]	upper_value_ptr	The address of the memory location where to store the upper thresholding value if the copy was requested in read mode, or from where to get the upper thresholding value to store into the threshold object if the copy was requested in write mode.
[in]	usage	This declares the effect of the copy with regard to the threshold object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that thresholding values are copied from the threshold object into the user memory. After the copy, only the field of (*lower_value_ptr) and (*upper_value_ptr) unions that corresponds to the input image format of the threshold object is meaningful. VX_WRITE_ONLY means the field of the (*lower_value_ptr) and (*upper_value_ptr) unions corresponding to the input format of the threshold object is copied into the threshold object.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the type of the memory referenced by lower_value_ptr and upper_value_ptr.

Returns

A vx_status_e enumeration.

Return values

VX_ERROR_INVALID_REFERENCE	The threshold reference is not actually a threshold reference.
VX_ERROR_NOT_COMPATIBLE	The threshold object doesn't have type VX_THRESHOLD_TYPE_RANGE
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCopyThresholdValue()

VX_API_ENTRY vx_status VX_API_CALL vxCopyThresholdValue	(	vx_threshold	thresh,
		vx_pixel_value_t *	value_ptr,
		vx_enum	usage,
		vx_enum	user_mem_type
	)

Allows the application to copy the thresholding value from/into a threshold object with type VX_THRESHOLD_TYPE_BINARY.

Parameters

[in]	thresh	The reference to the threshold object that is the source or the destination of the copy.
[in,out]	value_ptr	The address of the memory location where to store the thresholding value if the copy was requested in read mode, or from where to get the thresholding value to store into the threshold object if the copy was requested in write mode.
[in]	usage	This declares the effect of the copy with regard to the threshold object using the vx_accessor_e enumeration. Only VX_READ_ONLY and VX_WRITE_ONLY are supported: VX_READ_ONLY means that the thresholding value is copied from the threshold object into the user memory. After the copy, only the field of the (*value_ptr) union that corresponds to the input image format of the threshold object is meaningful. VX_WRITE_ONLY means the field of the (*value_ptr) union corresponding to the input format of the threshold object is copied into the threshold object.
[in]	user_mem_type	A vx_memory_type_e enumeration that specifies the type of the memory referenced by value_ptr.

Returns

A vx_status_e enumeration.

Return values

VX_ERROR_INVALID_REFERENCE	The threshold reference is not actually a threshold reference.
VX_ERROR_NOT_COMPATIBLE	The threshold object doesn't have type VX_THRESHOLD_TYPE_BINARY
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

◆ vxCreateArray()

VX_API_ENTRY vx_array VX_API_CALL vxCreateArray	(	vx_context	context,
		vx_enum	item_type,
		vx_size	capacity
	)

Creates a reference to an Array object.

User must specify the Array capacity (i.e., the maximal number of items that the array can hold).

Parameters

[in]	context	The reference to the overall Context.
[in]	item_type	The type of data to hold. Must be greater than VX_TYPE_INVALID and less than or equal to VX_TYPE_VENDOR_STRUCT_END. Or must be a vx_enum returned from vxRegisterUserStruct.
[in]	capacity	The maximal number of items that the array can hold. This value must be greater than zero.

Returns

An array reference vx_array. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateContext()

VX_API_ENTRY vx_context VX_API_CALL vxCreateContext

(

void

)

Creates a vx_context.

This creates a top-level object context for OpenVX.

Note

This is required to do anything else.

Returns

The reference to the implementation context vx_context. Any possible errors preventing a successful creation should be checked using vxGetStatus.

Postcondition

vxReleaseContext

◆ vxCreateConvolution()

VX_API_ENTRY vx_convolution VX_API_CALL vxCreateConvolution	(	vx_context	context,
		vx_size	columns,
		vx_size	rows
	)

Creates a reference to a convolution matrix object.

Parameters

[in]	context	The reference to the overall context.
[in]	columns	The columns dimension of the convolution. Must be odd and greater than or equal to 3 and less than the value returned from VX_CONTEXT_CONVOLUTION_MAX_DIMENSION.
[in]	rows	The rows dimension of the convolution. Must be odd and greater than or equal to 3 and less than the value returned from VX_CONTEXT_CONVOLUTION_MAX_DIMENSION.

Returns

A convolution reference vx_convolution. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateDelay()

VX_API_ENTRY vx_delay VX_API_CALL vxCreateDelay	(	vx_context	context,
		vx_reference	exemplar,
		vx_size	num_slots
	)

Creates a Delay object.

This function creates a delay object with num_slots slots. Each slot contains a clone of the exemplar. The clones only inherit the metadata of the exemplar. The data content of the exemplar is ignored and the clones have their data undefined at delay creation time. The function does not alter the exemplar. Also, it doesn't retain or release the reference to the exemplar.

Note

For the definition of metadata attributes see vxSetMetaFormatAttribute.

Parameters

[in]	context	The reference to the context.
[in]	exemplar	The exemplar object. Supported exemplar object types are: VX_TYPE_ARRAY VX_TYPE_CONVOLUTION VX_TYPE_DISTRIBUTION VX_TYPE_IMAGE VX_TYPE_LUT VX_TYPE_MATRIX VX_TYPE_OBJECT_ARRAY VX_TYPE_PYRAMID VX_TYPE_REMAP VX_TYPE_SCALAR VX_TYPE_THRESHOLD VX_TYPE_TENSOR
[in]	num_slots	The number of objects in the delay. This value must be greater than zero.

Returns

A delay reference vx_delay. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateDistribution()

VX_API_ENTRY vx_distribution VX_API_CALL vxCreateDistribution	(	vx_context	context,
		vx_size	numBins,
		vx_int32	offset,
		vx_uint32	range
	)

Creates a reference to a 1D Distribution of a consecutive interval [offset, offset + range - 1] defined by a start offset and valid range, divided equally into numBins parts.

Parameters

[in]	context	The reference to the overall context.
[in]	numBins	The number of bins in the distribution.
[in]	offset	The start offset into the range value that marks the begining of the 1D Distribution.
[in]	range	The total number of the consecutive values of the distribution interval.

Returns

A distribution reference vx_distribution. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateGenericNode()

VX_API_ENTRY vx_node VX_API_CALL vxCreateGenericNode	(	vx_graph	graph,
		vx_kernel	kernel
	)

Creates a reference to a node object for a given kernel.

This node has no references assigned as parameters after completion. The client is then required to set these parameters manually by vxSetParameterByIndex. When clients supply their own node creation functions (for use with User Kernels), this is the API to use along with the parameter setting API.

Parameters

[in]	graph	The reference to the graph in which this node exists.
[in]	kernel	The kernel reference to associate with this new node.

Returns

A node reference vx_node. Any possible errors preventing a successful creation should be checked using vxGetStatus.

Note

A call to this API sets all parameters to NULL.

Postcondition

Call vxSetParameterByIndex for as many parameters as needed to be set.

◆ vxCreateGraph()

VX_API_ENTRY vx_graph VX_API_CALL vxCreateGraph

(

vx_context

context

)

Creates an empty graph.

Parameters

[in]

context

The reference to the implementation context.

Returns

A graph reference vx_graph. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateImage()

VX_API_ENTRY vx_image VX_API_CALL vxCreateImage	(	vx_context	context,
		vx_uint32	width,
		vx_uint32	height,
		vx_df_image	color
	)

Creates an opaque reference to an image buffer.

Not guaranteed to exist until the vx_graph containing it has been verified.

Parameters

[in]	context	The reference to the implementation context.
[in]	width	The image width in pixels. The image in the formats of VX_DF_IMAGE_NV12, VX_DF_IMAGE_NV21, VX_DF_IMAGE_IYUV, VX_DF_IMAGE_UYVY, VX_DF_IMAGE_YUYV must have even width.
[in]	height	The image height in pixels. The image in the formats of VX_DF_IMAGE_NV12, VX_DF_IMAGE_NV21, VX_DF_IMAGE_IYUV must have even height.
[in]	color	The VX_DF_IMAGE (vx_df_image_e) code that represents the format of the image and the color space.

Returns

An image reference vx_image. Any possible errors preventing a successful creation should be checked using vxGetStatus.

See also

vxMapImagePatch to obtain direct memory access to the image data.

◆ vxCreateImageFromChannel()

VX_API_ENTRY vx_image VX_API_CALL vxCreateImageFromChannel	(	vx_image	img,
		vx_enum	channel
	)

Create a sub-image from a single plane channel of another image.

The sub-image refers to the data in the original image. Updates to this image update the parent image and reversely.

The function supports only channels that occupy an entire plane of a multi-planar images, as listed below. Other cases are not supported. VX_CHANNEL_Y from YUV4, IYUV, NV12, NV21 VX_CHANNEL_U from YUV4, IYUV VX_CHANNEL_V from YUV4, IYUV

Parameters

[in]	img	The reference to the parent image.
[in]	channel	The vx_channel_e channel to use.

Returns

An image reference vx_image to the sub-image. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateImageFromHandle()

VX_API_ENTRY vx_image VX_API_CALL vxCreateImageFromHandle	(	vx_context	context,
		vx_df_image	color,
		const vx_imagepatch_addressing_t	addrs[],
		void *const	ptrs[],
		vx_enum	memory_type
	)

Creates a reference to an image object that was externally allocated.

Parameters

[in]	context	The reference to the implementation context.
[in]	color	See the vx_df_image_e codes. This mandates the number of planes needed to be valid in the addrs and ptrs arrays based on the format given.
[in]	addrs[]	The array of image patch addressing structures that define the dimension and stride of the array of pointers. See note below.
[in]	ptrs[]	The array of platform-defined references to each plane. See note below.
[in]	memory_type	vx_memory_type_e. When giving VX_MEMORY_TYPE_HOST the ptrs array is assumed to be HOST accessible pointers to memory.

Returns

An image reference vx_image. Any possible errors preventing a successful creation should be checked using vxGetStatus.

Note

The user must call vxMapImagePatch prior to accessing the pixels of an image, even if the image was created via vxCreateImageFromHandle. Reads or writes to memory referenced by ptrs[ ] after calling vxCreateImageFromHandle without first calling vxMapImagePatch will result in undefined behavior. The property of addr[] and ptrs[] arrays is kept by the caller (It means that the implementation will make an internal copy of the provided information. addr and ptrs can then simply be application's local variables). Only dim_x, dim_y, stride_x and stride_y fields of the vx_imagepatch_addressing_t need to be provided by the application. Other fields (step_x, step_y, scale_x & scale_y) are ignored by this function. The layout of the imported memory must follow a row-major order. In other words, stride_x should be sufficiently large so that there is no overlap between data elements corresponding to different pixels, and stride_y >= stride_x * dim_x.

In order to release the image back to the application we should use vxSwapImageHandle. An exception is for VX_DF_IMAGE_U1 images where stride_x == 0 and instead stride_y >= ⌈dim_x / 8⌉.

Import type of the created image is available via the image attribute vx_image_attribute_e parameter.

◆ vxCreateImageFromROI()

VX_API_ENTRY vx_image VX_API_CALL vxCreateImageFromROI	(	vx_image	img,
		const vx_rectangle_t *	rect
	)

Creates an image from another image given a rectangle. This second reference refers to the data in the original image. Updates to this image updates the parent image. The rectangle must be defined within the pixel space of the parent image.

Parameters

[in]	img	The reference to the parent image.
[in]	rect	The region of interest rectangle. Must contain points within the parent image pixel space.

Returns

An image reference vx_image to the sub-image. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateImageObjectArrayFromTensor()

VX_API_ENTRY vx_object_array VX_API_CALL vxCreateImageObjectArrayFromTensor	(	vx_tensor	tensor,
		const vx_rectangle_t *	rect,
		vx_size	array_size,
		vx_size	jump,
		vx_df_image	image_format
	)

Creates an array of images into the multi-dimension data, this can be adjacent 2D images or not depending on the stride value. The stride value is representing bytes in the third dimension. The OpenVX image object that points to a three dimension data and access it as an array of images. This has to be portion of the third lowest dimension, and the stride correspond to that third dimension. The returned Object array is an array of images. Where the image data is pointing to a specific memory in the input tensor.

Parameters

[in]	tensor	The tensor data from which to extract the images. Has to be a 3d tensor.
[in]	rect	Image coordinates within tensor data.
[in]	array_size	Number of images to extract.
[in]	jump	Delta between two images in the array.
[in]	image_format	The requested image format. Should match the tensor data's data type.

Returns

An array of images pointing to the tensor data's data.

◆ vxCreateLUT()

VX_API_ENTRY vx_lut VX_API_CALL vxCreateLUT	(	vx_context	context,
		vx_enum	data_type,
		vx_size	count
	)

Creates LUT object of a given type. The value of VX_LUT_OFFSET is equal to 0 for data_type = VX_TYPE_UINT8, and (vx_uint32)(count/2) for VX_TYPE_INT16.

Parameters

[in]	context	The reference to the context.
[in]	data_type	The type of data stored in the LUT.
[in]	count	The number of entries desired.

Note

data_type can only be VX_TYPE_UINT8 or VX_TYPE_INT16. If data_type is VX_TYPE_UINT8, count should be not greater than 256. If data_type is VX_TYPE_INT16, count should not be greater than 65536.

Returns

An LUT reference vx_lut. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateMatrix()

VX_API_ENTRY vx_matrix VX_API_CALL vxCreateMatrix	(	vx_context	c,
		vx_enum	data_type,
		vx_size	columns,
		vx_size	rows
	)

Creates a reference to a matrix object.

Parameters

[in]	c	The reference to the overall context.
[in]	data_type	The vx_type_e that represents the data type of the matrix data elements.
[in]	columns	The first dimensionality.
[in]	rows	The second dimensionality.

Returns

An matrix reference vx_matrix. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateMatrixFromPattern()

VX_API_ENTRY vx_matrix VX_API_CALL vxCreateMatrixFromPattern	(	vx_context	context,
		vx_enum	pattern,
		vx_size	columns,
		vx_size	rows
	)

Creates a reference to a matrix object from a boolean pattern.

See also

vxCreateMatrixFromPatternAndOrigin for a description of the matrix patterns.

Parameters

[in]	context	The reference to the overall context.
[in]	pattern	The pattern of the matrix. See VX_MATRIX_PATTERN.
[in]	columns	The first dimensionality.
[in]	rows	The second dimensionality.

Returns

A matrix reference vx_matrix of type VX_TYPE_UINT8. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateMatrixFromPatternAndOrigin()

VX_API_ENTRY vx_matrix VX_API_CALL vxCreateMatrixFromPatternAndOrigin	(	vx_context	context,
		vx_enum	pattern,
		vx_size	columns,
		vx_size	rows,
		vx_size	origin_col,
		vx_size	origin_row
	)

Creates a reference to a matrix object from a boolean pattern, with a user-specified origin.

The matrix created by this function is of type VX_TYPE_UINT8, with the value 0 representing False, and the value 255 representing True. It supports the patterns as described below:

• VX_PATTERN_BOX is a matrix with dimensions equal to the given number of rows and columns, and all cells equal to 255. Dimensions of 3x3 and 5x5 must be supported.
• VX_PATTERN_CROSS is a matrix with dimensions equal to the given number of rows and columns, which both must be odd numbers. All cells in the center row and center column are equal to 255, and the rest are equal to zero. Dimensions of 3x3 and 5x5 must be supported.
• VX_PATTERN_DISK is a matrix with dimensions equal to the given number of rows (R) and columns (C), where R and C are odd and cell (c, r) is 255 if:
  (r-R/2 + 0.5)^2 / (R/2)^2 + (c-C/2 + 0.5)^2/(C/2)^2 is less than or equal to 1,
  and 0 otherwise.

A matrix created from pattern is read-only. The behavior when attempting to modify such a matrix is undefined.

Parameters

[in]	context	The reference to the overall context.
[in]	pattern	The pattern of the matrix. See VX_MATRIX_PATTERN.
[in]	columns	The first dimensionality.
[in]	rows	The second dimensionality.
[in]	origin_col	The origin (first dimensionality).
[in]	origin_row	The origin (second dimensionality).

Returns

A matrix reference vx_matrix of type VX_TYPE_UINT8. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateObjectArray()

VX_API_ENTRY vx_object_array VX_API_CALL vxCreateObjectArray	(	vx_context	context,
		vx_reference	exemplar,
		vx_size	count
	)

Creates a reference to an ObjectArray of count objects.

It uses the metadata of the exemplar to determine the object attributes, ignoring the object data. It does not alter the exemplar or keep or release the reference to the exemplar. For the definition of supported attributes see vxSetMetaFormatAttribute. In case the exemplar is a virtual object it must be of immutable metadata, thus it is not allowed to be dimensionless or formatless.

Parameters

[in]	context	The reference to the overall Context.
[in]	exemplar	The exemplar object that defines the metadata of the created objects in the ObjectArray.
[in]	count	Number of Objects to create in the ObjectArray. This value must be greater than zero.

Returns

An ObjectArray reference vx_object_array. Any possible errors preventing a successful creation should be checked using vxGetStatus. Data objects are not initialized by this function.

◆ vxCreatePyramid()

VX_API_ENTRY vx_pyramid VX_API_CALL vxCreatePyramid	(	vx_context	context,
		vx_size	levels,
		vx_float32	scale,
		vx_uint32	width,
		vx_uint32	height,
		vx_df_image	format
	)

Creates a reference to a pyramid object of the supplied number of levels.

Parameters

[in]	context	The reference to the overall context.
[in]	levels	The number of levels desired. This is required to be a non-zero value.
[in]	scale	Used to indicate the scale between pyramid levels. This is required to be a non-zero positive value. VX_SCALE_PYRAMID_HALF and VX_SCALE_PYRAMID_ORB must be supported.
[in]	width	The width of the 0th level image in pixels.
[in]	height	The height of the 0th level image in pixels.
[in]	format	The format of all images in the pyramid. NV12, NV21, IYUV, UYVY and YUYV formats are not supported.

Returns

A pyramid reference vx_pyramid containing the sub-images. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateRemap()

VX_API_ENTRY vx_remap VX_API_CALL vxCreateRemap	(	vx_context	context,
		vx_uint32	src_width,
		vx_uint32	src_height,
		vx_uint32	dst_width,
		vx_uint32	dst_height
	)

Creates a remap table object.

Parameters

[in]	context	The reference to the overall context.
[in]	src_width	Width of the source image in pixel.
[in]	src_height	Height of the source image in pixels.
[in]	dst_width	Width of the destination image in pixels.
[in]	dst_height	Height of the destination image in pixels.

Returns

A remap reference vx_remap. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateScalar()

VX_API_ENTRY vx_scalar VX_API_CALL vxCreateScalar	(	vx_context	context,
		vx_enum	data_type,
		const void *	ptr
	)

Creates a reference to a scalar object. Also see sub_node_parameters.

Parameters

[in]	context	The reference to the system context.
[in]	data_type	The type of data to hold. Must be greater than VX_TYPE_INVALID and less than or equal to VX_TYPE_VENDOR_STRUCT_END. Or must be a vx_enum returned from vxRegisterUserStruct.
[in]	ptr	The pointer to the initial value of the scalar or NULL. If NULL, the initial value of the scalar, if any, is implementation dependent.

Returns

A scalar reference vx_scalar. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateScalarWithSize()

VX_API_ENTRY vx_scalar VX_API_CALL vxCreateScalarWithSize	(	vx_context	context,
		vx_enum	data_type,
		const void *	ptr,
		vx_size	size
	)

Creates a reference to a scalar object. Also see sub_node_parameters.

Parameters

[in]	context	The reference to the system context.
[in]	data_type	The type of data to hold. Must be greater than VX_TYPE_INVALID and less than or equal to VX_TYPE_VENDOR_STRUCT_END. Or must be a vx_enum returned from vxRegisterUserStruct.
[in]	ptr	The pointer to the initial value of the scalar.
[in]	size	Size of data at ptr in bytes.

Returns

A scalar reference vx_scalar. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateTensor()

VX_API_ENTRY vx_tensor VX_API_CALL vxCreateTensor	(	vx_context	context,
		vx_size	number_of_dims,
		const vx_size *	dims,
		vx_enum	data_type,
		vx_int8	fixed_point_position
	)

Creates an opaque reference to a tensor data buffer.

Not guaranteed to exist until the vx_graph containing it has been verified. Since functions using tensors, need to understand the context of each dimension. We describe a layout of the dimensions in each function using tensors. That layout is not mandatory. It is done specifically to explain the functions and not to mandate layout. Different implementation may have different layout. Therefore the layout description is logical and not physical. It refers to the order of dimensions given in this function.

Parameters

[in]	context	The reference to the implementation context.
[in]	number_of_dims	The number of dimensions.
[in]	dims	Dimensions sizes in elements.
[in]	data_type	The vx_type_e that represents the data type of the tensor data elements.
[in]	fixed_point_position	Specifies the fixed point position when the input element type is integer. if 0, calculations are performed in integer math.

Returns

A tensor data reference. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateTensorFromHandle()

VX_API_ENTRY vx_tensor VX_API_CALL vxCreateTensorFromHandle	(	vx_context	context,
		vx_size	number_of_dims,
		const vx_size *	dims,
		vx_enum	data_type,
		vx_int8	fixed_point_position,
		const vx_size *	stride,
		void *	ptr,
		vx_enum	memory_type
	)

Creates a reference to an tensor object that was externally allocated.

Parameters

[in]	context	The reference to the implementation context.
[in]	number_of_dims	The number of dimensions.
[in]	dims	Dimensions sizes in elements.
[in]	data_type	The vx_type_e that represents the data type of the tensor data elements.
[in]	fixed_point_position	Specifies the fixed point position when the input element type is integer. if 0, calculations are performed in integer math.
[in]	stride	An array of stride in all dimensions in bytes. The stride value at index 0 must be size of the tensor data element type.
[in]	ptr	The platform-defined reference to tensor. See note below.
[in]	memory_type	vx_memory_type_e. When giving VX_MEMORY_TYPE_HOST the ptr is assumed to be HOST accessible pointer to memory.

Returns

A tensor data reference. Any possible errors preventing a successful creation should be checked using vxGetStatus.

Note

The user must call vxMapTensorPatch prior to accessing the elements of a tensor, even if the tensor was created via vxCreateTensorFromHandle. Reads or writes to memory referenced by ptr after calling vxCreateTensorFromHandle without first calling vxMapTensorPatch will result in undefined behavior. The property of stride[] and ptr is kept by the caller (It means that the implementation will make an internal copy of the provided information. stride and ptr can then simply be application's local variables).

In order to release the tensor back to the application we should use vxSwapTensorHandle.

◆ vxCreateTensorFromView()

VX_API_ENTRY vx_tensor VX_API_CALL vxCreateTensorFromView	(	vx_tensor	tensor,
		vx_size	number_of_dims,
		const vx_size *	view_start,
		const vx_size *	view_end
	)

Creates a tensor data from another tensor data given a view. This second reference refers to the data in the original tensor data. Updates to this tensor data updates the parent tensor data. The view must be defined within the dimensions of the parent tensor data.

Parameters

[in]	tensor	The reference to the parent tensor data.
[in]	number_of_dims	Number of dimensions in the view. Error return if 0 or greater than number of tensor dimensions. If smaller than number of tensor dimensions, the lower dimensions are assumed.
[in]	view_start	View start coordinates
[in]	view_end	View end coordinates

Returns

The reference to the sub-tensor. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateThresholdForImage()

VX_API_ENTRY vx_threshold VX_API_CALL vxCreateThresholdForImage	(	vx_context	context,
		vx_enum	thresh_type,
		vx_df_image	input_format,
		vx_df_image	output_format
	)

Creates a threshold object and returns a reference to it.

The threshold object defines the parameters of a thresholding operation to an input image, that generates an output image that can have a different format. The thresholding 'false' or 'true' output values are specified per pixel channels of the output format and can be modified with vxCopyThresholdOutput. The default 'false' output value of pixels channels should be 0, and the default 'true' value should be non-zero. For standard image formats, default output pixel values are defined as following:

• VX_DF_IMAGE_RGB : false={0, 0, 0}, true={255,255,255}
• VX_DF_IMAGE_RGBX : false={0, 0, 0, 0}, true={255,255,255,255}
• VX_DF_IMAGE_NV12 : false={0, 0, 0}, true={255,255,255}
• VX_DF_IMAGE_NV21 : false={0, 0, 0}, true={255,255,255}
• VX_DF_IMAGE_UYVY : false={0, 0, 0}, true={255,255,255}
• VX_DF_IMAGE_YUYV : false={0, 0, 0}, true={255,255,255}
• VX_DF_IMAGE_IYUV : false={0, 0, 0}, true={255,255,255}
• VX_DF_IMAGE_YUV4 : false={0, 0, 0}, true={255,255,255}
• VX_DF_IMAGE_U8 : false=0, true=0xFF
• VX_DF_IMAGE_S16 : false=0, true=-1
• VX_DF_IMAGE_U16 : false=0, true=0xFFFF
• VX_DF_IMAGE_S32 : false=0, true=-1
• VX_DF_IMAGE_U32 : false=0, true=0xFFFFFFFF

  Parameters

  [in]	context	The reference to the context in which the object is created.
  [in]	thresh_type	The type of thresholding operation.
  [in]	input_format	The format of images that will be used as input of the thresholding operation.
  [in]	output_format	The format of images that will be generated by the thresholding operation.

  Returns

  A threshold reference vx_threshold. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateUniformImage()

VX_API_ENTRY vx_image VX_API_CALL vxCreateUniformImage	(	vx_context	context,
		vx_uint32	width,
		vx_uint32	height,
		vx_df_image	color,
		const vx_pixel_value_t *	value
	)

Creates a reference to an image object that has a singular, uniform value in all pixels. The uniform image created is read-only.

Parameters

[in]	context	The reference to the implementation context.
[in]	width	The image width in pixels. The image in the formats of VX_DF_IMAGE_NV12, VX_DF_IMAGE_NV21, VX_DF_IMAGE_IYUV, VX_DF_IMAGE_UYVY, VX_DF_IMAGE_YUYV must have even width.
[in]	height	The image height in pixels. The image in the formats of VX_DF_IMAGE_NV12, VX_DF_IMAGE_NV21, VX_DF_IMAGE_IYUV must have even height.
[in]	color	The VX_DF_IMAGE (vx_df_image_e) code that represents the format of the image and the color space.
[in]	value	The pointer to the pixel value to which to set all pixels. See vx_pixel_value_t.

Returns

An image reference vx_image. Any possible errors preventing a successful creation should be checked using vxGetStatus.

See also

vxMapImagePatch to obtain direct memory access to the image data.

Note

vxMapImagePatch and vxUnmapImagePatch may be called with a uniform image reference.

◆ vxCreateVirtualArray()

VX_API_ENTRY vx_array VX_API_CALL vxCreateVirtualArray	(	vx_graph	graph,
		vx_enum	item_type,
		vx_size	capacity
	)

Creates an opaque reference to a virtual Array with no direct user access.

Virtual Arrays are useful when item type or capacity are unknown ahead of time and the Array is used as internal graph edge. Virtual arrays are scoped within the parent graph only.

All of the following constructions are allowed.

vx_context context = vxCreateContext();

vx_graph graph = vxCreateGraph(context);

vx_array virt[] = {

vxCreateVirtualArray(graph, 0, 0), // totally unspecified

vxCreateVirtualArray(graph, VX_TYPE_KEYPOINT, 0), // unspecified capacity

vxCreateVirtualArray(graph, VX_TYPE_KEYPOINT, 1000), // no access

};

vxCreateContext

VX_API_ENTRY vx_context VX_API_CALL vxCreateContext(void)

Creates a vx_context.

vxCreateGraph

VX_API_ENTRY vx_graph VX_API_CALL vxCreateGraph(vx_context context)

Creates an empty graph.

vxCreateVirtualArray

VX_API_ENTRY vx_array VX_API_CALL vxCreateVirtualArray(vx_graph graph, vx_enum item_type, vx_size capacity)

Creates an opaque reference to a virtual Array with no direct user access.

vx_context

struct _vx_context * vx_context

An opaque reference to the implementation context.

Definition: vx_types.h:218

VX_TYPE_KEYPOINT

@ VX_TYPE_KEYPOINT

A vx_keypoint_t.

Definition: vx_types.h:348

vx_graph

struct _vx_graph * vx_graph

An opaque reference to a graph.

Definition: vx_types.h:211

vx_array

struct _vx_array * vx_array

The Array Object. Array is a strongly-typed container for other data structures.

Definition: vx_types.h:275

Parameters

[in]	graph	The reference to the parent graph.
[in]	item_type	The type of data to hold. Must be greater than VX_TYPE_INVALID and less than or equal to VX_TYPE_VENDOR_STRUCT_END. Or must be a vx_enum returned from vxRegisterUserStruct. This may to set to zero to indicate an unspecified item type.
[in]	capacity	The maximal number of items that the array can hold. This may be to set to zero to indicate an unspecified capacity.

See also

vxCreateArray for a type list.

Returns

A array reference vx_array. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateVirtualConvolution()

VX_API_ENTRY vx_convolution VX_API_CALL vxCreateVirtualConvolution	(	vx_graph	graph,
		vx_size	columns,
		vx_size	rows
	)

Creates an opaque reference to a convolution matrix object without direct user access.

Parameters

[in]	graph	The reference to the parent graph.
[in]	columns	The columns dimension of the convolution. Must be odd and greater than or equal to 3 and less than the value returned from VX_CONTEXT_CONVOLUTION_MAX_DIMENSION.
[in]	rows	The rows dimension of the convolution. Must be odd and greater than or equal to 3 and less than the value returned from VX_CONTEXT_CONVOLUTION_MAX_DIMENSION.

See also

vxCreateConvolution

Returns

A convolution reference vx_convolution. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateVirtualDistribution()

VX_API_ENTRY vx_distribution VX_API_CALL vxCreateVirtualDistribution	(	vx_graph	graph,
		vx_size	numBins,
		vx_int32	offset,
		vx_uint32	range
	)

Creates an opaque reference to a 1D Distribution object without direct user access.

Parameters

[in]	graph	The reference to the parent graph.
[in]	numBins	The number of bins in the distribution.
[in]	offset	The start offset into the range value that marks the begining of the 1D Distribution.
[in]	range	The total number of the consecutive values of the distribution interval.

See also

vxCreateDistribution

Returns

A distribution reference vx_distribution. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateVirtualImage()

VX_API_ENTRY vx_image VX_API_CALL vxCreateVirtualImage	(	vx_graph	graph,
		vx_uint32	width,
		vx_uint32	height,
		vx_df_image	color
	)

Creates an opaque reference to an image buffer with no direct user access. This function allows setting the image width, height, or format.

Virtual data objects allow users to connect various nodes within a graph via data references without access to that data, but they also permit the implementation to take maximum advantage of possible optimizations. Use this API to create a data reference to link two or more nodes together when the intermediate data are not required to be accessed by outside entities. This API in particular allows the user to define the image format of the data without requiring the exact dimensions. Virtual objects are scoped within the graph they are declared a part of, and can't be shared outside of this scope. All of the following constructions of virtual images are valid.

vx_context context = vxCreateContext();

vx_graph graph = vxCreateGraph(context);

vx_image virt[] = {

vxCreateVirtualImage(graph, 0, 0, VX_DF_IMAGE_U8), // no specified dimension

vxCreateVirtualImage(graph, 320, 240, VX_DF_IMAGE_VIRT), // no specified format

vxCreateVirtualImage(graph, 640, 480, VX_DF_IMAGE_U8), // no user access

};

vxCreateVirtualImage

VX_API_ENTRY vx_image VX_API_CALL vxCreateVirtualImage(vx_graph graph, vx_uint32 width, vx_uint32 height, vx_df_image color)

Creates an opaque reference to an image buffer with no direct user access. This function allows setti...

VX_DF_IMAGE_VIRT

@ VX_DF_IMAGE_VIRT

A virtual image of no defined type.

Definition: vx_types.h:707

VX_DF_IMAGE_U8

@ VX_DF_IMAGE_U8

A single plane of unsigned 8-bit data. The range of data is not specified, as it may be extracted fro...

Definition: vx_types.h:750

vx_image

struct _vx_image * vx_image

An opaque reference to an image.

Definition: vx_types.h:182

Parameters

[in]	graph	The reference to the parent graph.
[in]	width	The width of the image in pixels. A value of zero informs the interface that the value is unspecified. The image in the formats of VX_DF_IMAGE_NV12, VX_DF_IMAGE_NV21, VX_DF_IMAGE_IYUV, VX_DF_IMAGE_UYVY, VX_DF_IMAGE_YUYV must have even width.
[in]	height	The height of the image in pixels. A value of zero informs the interface that the value is unspecified. The image in the formats of VX_DF_IMAGE_NV12, VX_DF_IMAGE_NV21, VX_DF_IMAGE_IYUV must have even height.
[in]	color	The VX_DF_IMAGE (vx_df_image_e) code that represents the format of the image and the color space. A value of VX_DF_IMAGE_VIRT informs the interface that the format is unspecified.

Returns

An image reference vx_image. Any possible errors preventing a successful creation should be checked using vxGetStatus.

Note

Passing this reference to vxMapImagePatch will return an error.

◆ vxCreateVirtualLUT()

VX_API_ENTRY vx_lut VX_API_CALL vxCreateVirtualLUT	(	vx_graph	graph,
		vx_enum	data_type,
		vx_size	count
	)

Creates an opaque reference to a LUT object with no direct user access.

Parameters

[in]	graph	The reference to the parent graph.
[in]	data_type	The type of data stored in the LUT.
[in]	count	The number of entries desired.

See also

vxCreateLUT

Note

data_type can only be VX_TYPE_UINT8 or VX_TYPE_INT16. If data_type is VX_TYPE_UINT8, count should be not greater than 256. If data_type is VX_TYPE_INT16, count should not be greater than 65536.

Returns

An LUT reference vx_lut. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateVirtualMatrix()

VX_API_ENTRY vx_matrix VX_API_CALL vxCreateVirtualMatrix	(	vx_graph	graph,
		vx_enum	data_type,
		vx_size	columns,
		vx_size	rows
	)

Creates an opaque reference to a matrix object without direct user access.

Parameters

[in]	graph	The reference to the parent graph.
[in]	data_type	The vx_type_e that represents the data type of the matrix data elements.
[in]	columns	The first dimensionality.
[in]	rows	The second dimensionality.

See also

vxCreateMatrix

Returns

An matrix reference vx_matrix. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateVirtualObjectArray()

VX_API_ENTRY vx_object_array VX_API_CALL vxCreateVirtualObjectArray	(	vx_graph	graph,
		vx_reference	exemplar,
		vx_size	count
	)

Creates an opaque reference to a virtual ObjectArray with no direct user access.

This function creates an ObjectArray of count objects with similar behavior as vxCreateObjectArray. The only difference is that the objects that are created are virtual in the given graph.

Parameters

[in]	graph	Reference to the graph where to create the virtual ObjectArray.
[in]	exemplar	The exemplar object that defines the type of object in the ObjectArray. Only exemplar type of vx_image, vx_array and vx_pyramid are allowed.
[in]	count	Number of Objects to create in the ObjectArray.

Returns

A ObjectArray reference vx_object_array. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateVirtualPyramid()

VX_API_ENTRY vx_pyramid VX_API_CALL vxCreateVirtualPyramid	(	vx_graph	graph,
		vx_size	levels,
		vx_float32	scale,
		vx_uint32	width,
		vx_uint32	height,
		vx_df_image	format
	)

Creates a reference to a virtual pyramid object of the supplied number of levels.

Virtual Pyramids can be used to connect Nodes together when the contents of the pyramids will not be accessed by the user of the API. All of the following constructions are valid:

vx_context context = vxCreateContext();

vx_graph graph = vxCreateGraph(context);

vx_pyramid virt[] = {

vxCreateVirtualPyramid(graph, 4, VX_SCALE_PYRAMID_HALF, 0, 0, VX_DF_IMAGE_VIRT), // no dimension and format specified for level 0

vxCreateVirtualPyramid(graph, 4, VX_SCALE_PYRAMID_HALF, 640, 480, VX_DF_IMAGE_VIRT), // no format specified.

vxCreateVirtualPyramid(graph, 4, VX_SCALE_PYRAMID_HALF, 640, 480, VX_DF_IMAGE_U8), // no access

};

vxCreateVirtualPyramid

VX_API_ENTRY vx_pyramid VX_API_CALL vxCreateVirtualPyramid(vx_graph graph, vx_size levels, vx_float32 scale, vx_uint32 width, vx_uint32 height, vx_df_image format)

Creates a reference to a virtual pyramid object of the supplied number of levels.

VX_SCALE_PYRAMID_HALF

#define VX_SCALE_PYRAMID_HALF

Use to indicate a half-scale pyramid.

Definition: vx_types.h:1640

vx_pyramid

struct _vx_pyramid * vx_pyramid

The Image Pyramid object. A set of scaled images.

Definition: vx_types.h:251

Parameters

[in]	graph	The reference to the parent graph.
[in]	levels	The number of levels desired. This is required to be a non-zero value.
[in]	scale	Used to indicate the scale between pyramid levels. This is required to be a non-zero positive value. VX_SCALE_PYRAMID_HALF and VX_SCALE_PYRAMID_ORB must be supported.
[in]	width	The width of the 0th level image in pixels. This may be set to zero to indicate to the interface that the value is unspecified.
[in]	height	The height of the 0th level image in pixels. This may be set to zero to indicate to the interface that the value is unspecified.
[in]	format	The format of all images in the pyramid. This may be set to VX_DF_IMAGE_VIRT to indicate that the format is unspecified.

Returns

A pyramid reference vx_pyramid. Any possible errors preventing a successful creation should be checked using vxGetStatus.

Note

Images extracted with vxGetPyramidLevel behave as Virtual Images and cause vxMapImagePatch to return errors.

◆ vxCreateVirtualRemap()

VX_API_ENTRY vx_remap VX_API_CALL vxCreateVirtualRemap	(	vx_graph	graph,
		vx_uint32	src_width,
		vx_uint32	src_height,
		vx_uint32	dst_width,
		vx_uint32	dst_height
	)

Creates an opaque reference to a remap table object without direct user access.

Parameters

[in]	graph	The reference to the parent graph.
[in]	src_width	Width of the source image in pixel.
[in]	src_height	Height of the source image in pixels.
[in]	dst_width	Width of the destination image in pixels.
[in]	dst_height	Height of the destination image in pixels.

See also

vxCreateRemap

Returns

A remap reference vx_remap. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateVirtualScalar()

VX_API_ENTRY vx_scalar VX_API_CALL vxCreateVirtualScalar	(	vx_graph	graph,
		vx_enum	data_type
	)

Creates an opaque reference to a scalar object with no direct user access.

Parameters

[in]	graph	The reference to the parent graph.
[in]	data_type	The type of data to hold. Must be greater than VX_TYPE_INVALID and less than or equal to VX_TYPE_VENDOR_STRUCT_END. Or must be a vx_enum returned from vxRegisterUserStruct.

See also

vxCreateScalar

Returns

A scalar reference vx_scalar. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxCreateVirtualTensor()

VX_API_ENTRY vx_tensor VX_API_CALL vxCreateVirtualTensor	(	vx_graph	graph,
		vx_size	number_of_dims,
		const vx_size *	dims,
		vx_enum	data_type,
		vx_int8	fixed_point_position
	)

Creates an opaque reference to a tensor data buffer with no direct user access. This function allows setting the tensor data dimensions or data format.

Virtual data objects allow users to connect various nodes within a graph via data references without access to that data, but they also permit the implementation to take maximum advantage of possible optimizations. Use this API to create a data reference to link two or more nodes together when the intermediate data are not required to be accessed by outside entities. This API in particular allows the user to define the tensor data format of the data without requiring the exact dimensions. Virtual objects are scoped within the graph they are declared a part of, and can't be shared outside of this scope. Since functions using tensors, need to understand the context of each dimension. We describe a layout of the dimensions in each function. That layout is not mandated. It is done specifically to explain the functions and not to mandate layout. Different implementation may have different layout. Therfore the layout description is logical and not physical. It refers to the order of dimensions given in vxCreateTensor and vxCreateVirtualTensor.

Parameters

[in]	graph	The reference to the parent graph.
[in]	number_of_dims	The number of dimensions.
[in]	dims	Dimensions sizes in elements.
[in]	data_type	The vx_type_e that represents the data type of the tensor data elements.
[in]	fixed_point_position	Specifies the fixed point position when the input element type is integer. If 0, calculations are performed in integer math.

Returns

A tensor data reference.Any possible errors preventing a successful creation should be checked using vxGetStatus.

Note

Passing this reference to vxCopyTensorPatch will return an error.

◆ vxCreateVirtualThresholdForImage()

VX_API_ENTRY vx_threshold VX_API_CALL vxCreateVirtualThresholdForImage	(	vx_graph	graph,
		vx_enum	thresh_type,
		vx_df_image	input_format,
		vx_df_image	output_format
	)

Creates an opaque reference to a threshold object without direct user access.

Parameters

[in]	graph	The reference to the parent graph.
[in]	thresh_type	The type of thresholding operation.
[in]	input_format	The format of images that will be used as input of the thresholding operation.
[in]	output_format	The format of images that will be generated by the thresholding operation.

See also

vxCreateThresholdForImage

Returns

A threshold reference vx_threshold. Any possible errors preventing a successful creation should be checked using vxGetStatus.

◆ vxDirective()

VX_API_ENTRY vx_status VX_API_CALL vxDirective	(	vx_reference	reference,
		vx_enum	directive
	)

Provides a generic API to give platform-specific directives to the implementations.

Parameters

[in]	reference	The reference to the object to set the directive on. This could be vx_context, vx_graph, vx_node, vx_image, vx_array, or any other reference.
[in]	directive	The directive to set. See vx_directive_e.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	reference is not a valid vx_reference reference.
VX_ERROR_NOT_SUPPORTED	If the directive is not supported.

Note

The performance counter directives are only available for the reference vx_context. Error VX_ERROR_NOT_SUPPORTED is returned when used with any other reference.

◆ vxFinalizeKernel()

VX_API_ENTRY vx_status VX_API_CALL vxFinalizeKernel

(

vx_kernel

kernel

)

This API is called after all parameters have been added to the kernel and the kernel is ready to be used. Notice that the reference to the kernel created by vxAddUserKernel is still valid after the call to vxFinalizeKernel. If an error occurs, the kernel is not available for usage by the clients of OpenVX. Typically this is due to a mismatch between the number of parameters requested and given.

Parameters

[in]

kernel

The reference to the loaded kernel from vxAddUserKernel.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	kernel is not a valid vx_kernel reference.

Precondition

vxAddUserKernel and vxAddParameterToKernel

◆ vxFormatImagePatchAddress1d()

VX_API_ENTRY void* VX_API_CALL vxFormatImagePatchAddress1d	(	void *	ptr,
		vx_uint32	index,
		const vx_imagepatch_addressing_t *	addr
	)

Accesses a specific indexed pixel in an image patch.

Parameters

[in]	ptr	The base pointer of the patch as returned from vxMapImagePatch.
[in]	index	The 0 based index of the pixel count in the patch. Indexes increase horizontally by 1 then wrap around to the next row.
[in]	addr	The pointer to the addressing mode information returned from vxMapImagePatch.

Returns

void * Returns the pointer to the specified pixel.

Precondition

vxMapImagePatch

Note

Some special restrictions apply to VX_DF_IMAGE_U1 images.

◆ vxFormatImagePatchAddress2d()

VX_API_ENTRY void* VX_API_CALL vxFormatImagePatchAddress2d	(	void *	ptr,
		vx_uint32	x,
		vx_uint32	y,
		const vx_imagepatch_addressing_t *	addr
	)

Accesses a specific pixel at a 2d coordinate in an image patch.

Parameters

[in]	ptr	The base pointer of the patch as returned from vxMapImagePatch.
[in]	x	The x dimension within the patch.
[in]	y	The y dimension within the patch.
[in]	addr	The pointer to the addressing mode information returned from vxMapImagePatch.

Returns

void * Returns the pointer to the specified pixel.

Precondition

vxMapImagePatch

Note

Some special restrictions apply to VX_DF_IMAGE_U1 images.

◆ vxGetContext()

VX_API_ENTRY vx_context VX_API_CALL vxGetContext

(

vx_reference

reference

)

Retrieves the context from any reference from within a context.

Parameters

[in]

reference

The reference from which to extract the context.

Returns

The overall context that created the particular reference. Any possible errors preventing a successful completion of this function should be checked using vxGetStatus.

◆ vxGetGraphParameterByIndex()

VX_API_ENTRY vx_parameter VX_API_CALL vxGetGraphParameterByIndex	(	vx_graph	graph,
		vx_uint32	index
	)

Retrieves a vx_parameter from a vx_graph.

Parameters

[in]	graph	The graph.
[in]	index	The index of the parameter.

Returns

vx_parameter reference. Any possible errors preventing a successful function completion should be checked using vxGetStatus.

◆ vxGetKernelByEnum()

VX_API_ENTRY vx_kernel VX_API_CALL vxGetKernelByEnum	(	vx_context	context,
		vx_enum	kernel
	)

Obtains a reference to the kernel using the vx_kernel_e enumeration.

Enum values above the standard set are assumed to apply to loaded libraries.

Parameters

[in]	context	The reference to the implementation context.
[in]	kernel	A value from vx_kernel_e or a vendor or client-defined value.

Returns

A vx_kernel reference. Any possible errors preventing a successful completion of the function should be checked using vxGetStatus.

Precondition

vxLoadKernels if the kernel is not provided by the OpenVX implementation.

◆ vxGetKernelByName()

VX_API_ENTRY vx_kernel VX_API_CALL vxGetKernelByName	(	vx_context	context,
		const vx_char *	name
	)

Obtains a reference to a kernel using a string to specify the name.

User Kernels follow a "dotted" heirarchical syntax. For example: "com.company.example.xyz". The following are strings specifying the kernel names:

org.khronos.openvx.color_convert

org.khronos.openvx.channel_extract

org.khronos.openvx.channel_combine

org.khronos.openvx.sobel_3x3

org.khronos.openvx.magnitude

org.khronos.openvx.phase

org.khronos.openvx.scale_image

org.khronos.openvx.table_lookup

org.khronos.openvx.histogram

org.khronos.openvx.equalize_histogram

org.khronos.openvx.absdiff

org.khronos.openvx.mean_stddev

org.khronos.openvx.threshold

org.khronos.openvx.integral_image

org.khronos.openvx.dilate_3x3

org.khronos.openvx.erode_3x3

org.khronos.openvx.median_3x3

org.khronos.openvx.box_3x3

org.khronos.openvx.gaussian_3x3

org.khronos.openvx.custom_convolution

org.khronos.openvx.gaussian_pyramid

org.khronos.openvx.minmaxloc

org.khronos.openvx.convertdepth

org.khronos.openvx.canny_edge_detector

org.khronos.openvx.and

org.khronos.openvx.or

org.khronos.openvx.xor

org.khronos.openvx.not

org.khronos.openvx.multiply

org.khronos.openvx.add

org.khronos.openvx.subtract

org.khronos.openvx.warp_affine

org.khronos.openvx.warp_perspective

org.khronos.openvx.harris_corners

org.khronos.openvx.fast_corners

org.khronos.openvx.optical_flow_pyr_lk

org.khronos.openvx.remap

org.khronos.openvx.halfscale_gaussian

org.khronos.openvx.laplacian_pyramid

org.khronos.openvx.laplacian_reconstruct

org.khronos.openvx.non_linear_filter

org.khronos.openvx.match_template

org.khronos.openvx.lbp

org.khronos.openvx.hough_lines_p

org.khronos.openvx.tensor_multiply

org.khronos.openvx.tensor_add

org.khronos.openvx.tensor_subtract

org.khronos.openvx.tensor_table_lookup

org.khronos.openvx.tensor_transpose

org.khronos.openvx.tensor_convert_depth

org.khronos.openvx.tensor_matrix_multiply

org.khronos.openvx.copy

org.khronos.openvx.non_max_suppression

org.khronos.openvx.scalar_operation

org.khronos.openvx.hog_features

org.khronos.openvx.hog_cells

org.khronos.openvx.bilateral_filter

org.khronos.openvx.select

org.khronos.openvx.min

org.khronos.openvx.max

org.khronos.openvx.weighted_average

Parameters

[in]	context	The reference to the implementation context.
[in]	name	The string of the name of the kernel to get.

Returns

A kernel reference. Any possible errors preventing a successful completion of the function should be checked using vxGetStatus.

Precondition

vxLoadKernels if the kernel is not provided by the OpenVX implementation.

Note

User Kernels should follow a "dotted" hierarchical syntax. For example: "com.company.example.xyz".

◆ vxGetKernelParameterByIndex()

VX_API_ENTRY vx_parameter VX_API_CALL vxGetKernelParameterByIndex	(	vx_kernel	kernel,
		vx_uint32	index
	)

Retrieves a vx_parameter from a vx_kernel.

Parameters

[in]	kernel	The reference to the kernel.
[in]	index	The index of the parameter.

Returns

A vx_parameter reference. Any possible errors preventing a successful completion of the function should be checked using vxGetStatus.

◆ vxGetObjectArrayItem()

VX_API_ENTRY vx_reference VX_API_CALL vxGetObjectArrayItem	(	vx_object_array	arr,
		vx_uint32	index
	)

Retrieves the reference to the OpenVX Object in location index of the ObjectArray.

This is a vx_reference, which can be used elsewhere in OpenVX. A call to vxRelease<Object> or vxReleaseReference is necessary to release the Object for each call to this function.

Parameters

[in]	arr	The ObjectArray.
[in]	index	The index of the object in the ObjectArray.

Returns

A reference to an OpenVX data object. Any possible errors preventing a successful completion of the function should be checked using vxGetStatus.

◆ vxGetParameterByIndex()

VX_API_ENTRY vx_parameter VX_API_CALL vxGetParameterByIndex	(	vx_node	node,
		vx_uint32	index
	)

Retrieves a vx_parameter from a vx_node.

Parameters

[in]	node	The node from which to extract the parameter.
[in]	index	The index of the parameter to which to get a reference.

Returns

A parameter reference vx_parameter. Any possible errors preventing a successful completion of the function should be checked using vxGetStatus.

◆ vxGetPyramidLevel()

VX_API_ENTRY vx_image VX_API_CALL vxGetPyramidLevel	(	vx_pyramid	pyr,
		vx_uint32	index
	)

Retrieves a level of the pyramid as a vx_image, which can be used elsewhere in OpenVX. A call to vxReleaseImage is necessary to release an image for each call of vxGetPyramidLevel.

Parameters

[in]	pyr	The pyramid object.
[in]	index	The index of the level, such that index is less than levels.

Returns

A vx_image reference. Any possible errors preventing a successful function completion should be checked using vxGetStatus.

◆ vxGetReferenceFromDelay()

VX_API_ENTRY vx_reference VX_API_CALL vxGetReferenceFromDelay	(	vx_delay	delay,
		vx_int32	index
	)

Retrieves a reference to a delay slot object.

Parameters

[in]	delay	The reference to the delay object.
[in]	index	The index of the delay slot from which to extract the object reference.

Returns

vx_reference. Any possible errors preventing a successful completion of the function should be checked using vxGetStatus.

Note

The delay index is in the range \( [-count+1,0] \). 0 is always the current object.

A reference retrieved with this function must not be given to its associated release API (e.g. vxReleaseImage) unless vxRetainReference is used.

◆ vxGetStatus()

VX_API_ENTRY vx_status VX_API_CALL vxGetStatus

(

vx_reference

reference

)

Provides a generic API to return status values from Object constructors if they fail.

Note

Users do not need to strictly check every object creator as the errors should properly propagate and be detected during verification time or run-time.

vx_image img = vxCreateImage(context, 639, 480, VX_DF_IMAGE_UYVY);

vx_status status = vxGetStatus((vx_reference)img);

// status == VX_ERROR_INVALID_DIMENSIONS

vxReleaseImage(&img);

vxReleaseImage

VX_API_ENTRY vx_status VX_API_CALL vxReleaseImage(vx_image *image)

Releases a reference to an image object. The object may not be garbage collected until its total refe...

vxGetStatus

VX_API_ENTRY vx_status VX_API_CALL vxGetStatus(vx_reference reference)

Provides a generic API to return status values from Object constructors if they fail.

vxCreateImage

VX_API_ENTRY vx_image VX_API_CALL vxCreateImage(vx_context context, vx_uint32 width, vx_uint32 height, vx_df_image color)

Creates an opaque reference to an image buffer.

vx_reference

struct _vx_reference * vx_reference

A generic opaque reference to any object within OpenVX.

Definition: vx_types.h:145

VX_DF_IMAGE_UYVY

@ VX_DF_IMAGE_UYVY

A single plane of 32-bit macro pixel of U0, Y0, V0, Y1 bytes. This uses the BT709 full range by defau...

Definition: vx_types.h:728

vx_status

vx_enum vx_status

A formal status type with known fixed size.

Definition: vx_types.h:445

Precondition

Appropriate Object Creator function.

Postcondition

Appropriate Object Release function.

Parameters

[in]

reference

The reference to check for construction errors.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
*	Some error occurred, please check enumeration list and constructor.

◆ vxGetUserStructEnumByName()

VX_API_ENTRY vx_status VX_API_CALL vxGetUserStructEnumByName	(	vx_context	context,
		const vx_char *	type_name,
		vx_enum *	user_struct_type
	)

Returns the enum of the user-defined structure associated with the name given.

Parameters

[in]	context	The reference to the implementation context.
[in]	type_name	Pointer to the '\0' terminated string that identifies the user struct type. The length of the string shall be lower than VX_MAX_REFERENCE_NAME bytes.
[out]	user_struct_type	The enumeration value of the user struct

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	type_name was valid, and enumeration was found and returned
VX_FAILURE	type_name does not match any user struct enumeration.

Precondition

vxRegisterUserStructWithName should be called for this user struct.

◆ vxGetUserStructNameByEnum()

VX_API_ENTRY vx_status VX_API_CALL vxGetUserStructNameByEnum	(	vx_context	context,
		vx_enum	user_struct_type,
		vx_char *	type_name,
		vx_size	name_size
	)

Returns the name of the user-defined structure associated with the enumeration given.

Parameters

[in]	context	The reference to the implementation context.
[out]	user_struct_type	Name of the user struct
[in]	type_name	The enumeration value of the user struct
[in]	name_size	The size of allocated buffer pointed to by type_name

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	user_struct_type was valid, and name was found and returned
VX_ERROR_INVALID_PARAMETERS	user_struct_type was not a valid user struct enumeration.
VX_ERROR_NO_MEMORY	name_size is too small to hold the name of the user struct type.
VX_FAILURE	user_struct_type does not have an associated type name.

Precondition

vxRegisterUserStructWithName should be called for this user struct.

◆ vxGetValidRegionImage()

VX_API_ENTRY vx_status VX_API_CALL vxGetValidRegionImage	(	vx_image	image,
		vx_rectangle_t *	rect
	)

Retrieves the valid region of the image as a rectangle.

Parameters

[in]	image	The image from which to retrieve the valid region.
[out]	rect	The destination rectangle.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference.
VX_ERROR_INVALID_PARAMETERS	Invalid rect.

Note

This rectangle can be passed directly to vxMapImagePatch to get the full valid region of the image.

Some special restrictions apply to VX_DF_IMAGE_U1 images.

◆ vxHint()

VX_API_ENTRY vx_status VX_API_CALL vxHint	(	vx_reference	reference,
		vx_enum	hint,
		const void *	data,
		vx_size	data_size
	)

Provides a generic API to give platform-specific hints to the implementation.

Parameters

[in]	reference	The reference to the object to hint at. This could be vx_context, vx_graph, vx_node, vx_image, vx_array, or any other reference.
[in]	hint	A vx_hint_e hint to give to a vx_context. This is a platform-specific optimization or implementation mechanism.
[in]	data	Optional vendor specific data.
[in]	data_size	Size of the data structure data.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	reference is not a valid vx_reference reference.
VX_ERROR_NOT_SUPPORTED	If the hint is not supported.

◆ vxIsGraphVerified()

VX_API_ENTRY vx_bool VX_API_CALL vxIsGraphVerified

(

vx_graph

graph

)

Returns a Boolean to indicate the state of graph verification.

Parameters

[in]

graph

The reference to the graph to check.

Returns

A vx_bool value.

Return values

vx_true_e	The graph is verified.
vx_false_e	The graph is not verified. It must be verified before execution either through vxVerifyGraph or automatically through vxProcessGraph or vxScheduleGraph.

◆ vxLoadKernels()

VX_API_ENTRY vx_status VX_API_CALL vxLoadKernels	(	vx_context	context,
		const vx_char *	module
	)

Loads a library of kernels, called module, into a context.

The module must be registered by vxRegisterKernelLibrary if it is not a dynamic library or the module must be a dynamic library with by convention, two exported functions named vxPublishKernels and vxUnpublishKernels.

vxPublishKernels must have type vx_publish_kernels_f, and must add kernels to the context by calling vxAddUserKernel for each new kernel. vxPublishKernels is called by vxLoadKernels.

vxUnpublishKernels must have type vx_unpublish_kernels_f, and must remove kernels from the context by calling vxRemoveKernel for each kernel the vxPublishKernels has added. vxUnpublishKernels is called by vxUnloadKernels.

Note

When all references to loaded kernels are released, the module may be automatically unloaded.

Parameters

[in]	context	The reference to the context the kernels must be added to.
[in]	module	The short name of the module to load. On systems where there are specific naming conventions for modules, the name passed should ignore such conventions. For example: libxyz.so should be passed as just xyz and the implementation will do the right thing that the platform requires.

Note

This API uses the system pre-defined paths for modules.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	context is not a valid vx_context reference.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

Precondition

vxRegisterKernelLibrary if the module is not a dynamic library

See also

vxGetKernelByName

◆ vxMapArrayRange()

VX_API_ENTRY vx_status VX_API_CALL vxMapArrayRange	(	vx_array	array,
		vx_size	range_start,
		vx_size	range_end,
		vx_map_id *	map_id,
		vx_size *	stride,
		void **	ptr,
		vx_enum	usage,
		vx_enum	mem_type,
		vx_uint32	flags
	)

Allows the application to get direct access to a range of an array object.

Parameters

[in]	array	The reference to the array object that contains the range to map.
[in]	range_start	The index of the first item of the array object to map.
[in]	range_end	The index of the item following the last item of the array object to map. (range_end range_start) items are mapped, starting from index range_start included. The range must be within the bounds of the array: Must be 0 <= range_start < range_end <= number of items.
[out]	map_id	The address of a vx_map_id variable where the function returns a map identifier. (*map_id) must eventually be provided as the map_id parameter of a call to vxUnmapArrayRange.
[out]	stride	The address of a vx_size variable where the function returns the memory layout of the mapped array range. The function sets (*stride) to the number of bytes between the beginning of two consecutive items. The application must consult (*stride) to access the array items starting from address (*ptr). The layout of the mapped array follows an item major order: (*stride) >= item size in bytes.
[out]	ptr	The address of a pointer that the function sets to the address where the requested data can be accessed. The returned (*ptr) address is only valid between the call to the function and the corresponding call to vxUnmapArrayRange.
[in]	usage	This declares the access mode for the array range, using the vx_accessor_e enumeration. VX_READ_ONLY: after the function call, the content of the memory location pointed by (*ptr) contains the array range data. Writing into this memory location is forbidden and its behavior is undefined. VX_READ_AND_WRITE: after the function call, the content of the memory location pointed by (*ptr) contains the array range data; writing into this memory is allowed only for the location of items and will result in a modification of the affected items in the array object once the range is unmapped. Writing into a gap between items (when (*stride) > item size in bytes) is forbidden and its behavior is undefined. VX_WRITE_ONLY: after the function call, the memory location pointed by (*ptr) contains undefined data; writing each item of the range is required prior to unmapping. Items not written by the application before unmap will become undefined after unmap, even if they were well defined before map. Like for VX_READ_AND_WRITE, writing into a gap between items is forbidden and its behavior is undefined.
[in]	mem_type	A vx_memory_type_e enumeration that specifies the type of the memory where the array range is requested to be mapped.
[in]	flags	An integer that allows passing options to the map operation. Use the vx_map_flag_e enumeration.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_OPTIMIZED_AWAY	This is a reference to a virtual array that cannot be accessed by the application.
VX_ERROR_INVALID_REFERENCE	array is not a valid vx_array reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Postcondition

vxUnmapArrayRange with same (*map_id) value.

◆ vxMapDistribution()

VX_API_ENTRY vx_status VX_API_CALL vxMapDistribution	(	vx_distribution	distribution,
		vx_map_id *	map_id,
		void **	ptr,
		vx_enum	usage,
		vx_enum	mem_type,
		vx_bitfield	flags
	)

Allows the application to get direct access to distribution object.

Parameters

[in]	distribution	The reference to the distribution object to map.
[out]	map_id	The address of a vx_map_id variable where the function returns a map identifier. (*map_id) must eventually be provided as the map_id parameter of a call to vxUnmapDistribution.
[out]	ptr	The address of a pointer that the function sets to the address where the requested data can be accessed. In the mapped memory area, data are structured as a vx_uint32 array with a number of elements equal to the value returned via VX_DISTRIBUTION_BINS. Each element of this array corresponds to a bin of the distribution, with a range-major ordering. Accessing the memory out of the bound of this array is forbidden and has an undefined behavior. The returned (*ptr) address is only valid between the call to the function and the corresponding call to vxUnmapDistribution.
[in]	usage	This declares the access mode for the distribution, using the vx_accessor_e enumeration. VX_READ_ONLY: after the function call, the content of the memory location pointed by (*ptr) contains the distribution data. Writing into this memory location is forbidden and its behavior is undefined. VX_READ_AND_WRITE: after the function call, the content of the memory location pointed by (*ptr) contains the distribution data; writing into this memory is allowed only for the location of bins and will result in a modification of the affected bins in the distribution object once the distribution is unmapped. VX_WRITE_ONLY: after the function call, the memory location pointed by (*ptr) contains undefined data; writing each bin of distribution is required prior to unmapping. Bins not written by the application before unmap will become undefined after unmap, even if they were well defined before map.
[in]	mem_type	A vx_memory_type_e enumeration that specifies the type of the memory where the distribution is requested to be mapped.
[in]	flags	An integer that allows passing options to the map operation. Use 0 for this option.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	distribution is not a valid vx_distribution reference. reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Postcondition

vxUnmapDistribution with same (*map_id) value.

◆ vxMapImagePatch()

VX_API_ENTRY vx_status VX_API_CALL vxMapImagePatch	(	vx_image	image,
		const vx_rectangle_t *	rect,
		vx_uint32	plane_index,
		vx_map_id *	map_id,
		vx_imagepatch_addressing_t *	addr,
		void **	ptr,
		vx_enum	usage,
		vx_enum	mem_type,
		vx_uint32	flags
	)

Allows the application to get direct access to a rectangular patch of an image object plane.

Parameters

[in]	image	The reference to the image object that contains the patch to map.
[in]	rect	The coordinates of image patch. The patch must be within the bounds of the image. (start_x, start_y) gives the coordinate of the topleft element inside the patch, while (end_x, end_y) give the coordinate of the bottomright element out of the patch. Must be 0 <= start < end.
[in]	plane_index	The plane index of the image object to be accessed.
[out]	map_id	The address of a vx_map_id variable where the function returns a map identifier. (*map_id) must eventually be provided as the map_id parameter of a call to vxUnmapImagePatch.
[out]	addr	The address of a vx_imagepatch_addressing_t structure describing the memory layout of the image patch to access. The function fills the structure pointed by addr with the layout information that the application must consult to access the pixel data at address (*ptr). The layout of the mapped memory follows a row-major order: stride_x>0, stride_y>0 and stride_y >= stride_x * dim_x. An exception is for VX_DF_IMAGE_U1 where stride_x == 0, stride_x_bits > 0 and stride_y {geq} (stride_x_bits * dim_x + 7) / 8 (i.e., at least the number of bytes needed to hold dim_x pixels). If the image object being accessed was created via vxCreateImageFromHandle, then the returned memory layout will be the identical to that of the addressing structure provided when vxCreateImageFromHandle was called.
[out]	ptr	The address of a pointer that the function sets to the address where the requested data can be accessed. This returned (*ptr) address is only valid between the call to this function and the corresponding call to vxUnmapImagePatch. If image was created via vxCreateImageFromHandle then the returned address (*ptr) will be the address of the patch in the original pixel buffer provided when image was created.
[in]	usage	This declares the access mode for the image patch, using the vx_accessor_e enumeration. For uniform images, only VX_READ_ONLY is supported. VX_READ_ONLY: after the function call, the content of the memory location pointed by (*ptr) contains the image patch data. Writing into this memory location is forbidden and its behavior is undefined. VX_READ_AND_WRITE: after the function call, the content of the memory location pointed by (*ptr) contains the image patch data; writing into this memory is allowed only for the location of pixels only and will result in a modification of the written pixels in the image object once the patch is unmapped. Writing into a gap between pixels (when addr->stride_x > pixel size in bytes or addr->stride_y > addr->stride_x*addr->dim_x) is forbidden and its behavior is undefined. VX_WRITE_ONLY: after the function call, the memory location pointed by (*ptr) contains undefined data; writing each pixel of the patch is required prior to unmapping. Pixels not written by the application before unmap will become undefined after unmap, even if they were well defined before map. Like for VX_READ_AND_WRITE, writing into a gap between pixels is forbidden and its behavior is undefined.
[in]	mem_type	A vx_memory_type_e enumeration that specifies the type of the memory where the image patch is requested to be mapped.
[in]	flags	An integer that allows passing options to the map operation. Use the vx_map_flag_e enumeration.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_OPTIMIZED_AWAY	This is a reference to a virtual image that cannot be accessed by the application.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference. reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Note

The user may ask for data outside the bounds of the valid region, but such data has an undefined value.

Postcondition

vxUnmapImagePatch with same (*map_id) value.

◆ vxMapLUT()

VX_API_ENTRY vx_status VX_API_CALL vxMapLUT	(	vx_lut	lut,
		vx_map_id *	map_id,
		void **	ptr,
		vx_enum	usage,
		vx_enum	mem_type,
		vx_bitfield	flags
	)

Allows the application to get direct access to LUT object.

Parameters

[in]	lut	The reference to the LUT object to map.
[out]	map_id	The address of a vx_map_id variable where the function returns a map identifier. (*map_id) must eventually be provided as the map_id parameter of a call to vxUnmapLUT.
[out]	ptr	The address of a pointer that the function sets to the address where the requested data can be accessed. In the mapped memory area, the LUT data are structured as an array with elements of the type corresponding to VX_LUT_TYPE, with a number of elements equal to the value returned via VX_LUT_COUNT. Accessing the memory out of the bound of this array is forbidden and has an undefined behavior. The returned (*ptr) address is only valid between the call to the function and the corresponding call to vxUnmapLUT.
[in]	usage	This declares the access mode for the LUT, using the vx_accessor_e enumeration. VX_READ_ONLY: after the function call, the content of the memory location pointed by (*ptr) contains the LUT data. Writing into this memory location is forbidden and its behavior is undefined. VX_READ_AND_WRITE: after the function call, the content of the memory location pointed by (*ptr) contains the LUT data; writing into this memory is allowed only for the location of entries and will result in a modification of the affected entries in the LUT object once the LUT is unmapped. VX_WRITE_ONLY: after the function call, the memory location pointed by(*ptr) contains undefined data; writing each entry of LUT is required prior to unmapping. Entries not written by the application before unmap will become undefined after unmap, even if they were well defined before map.
[in]	mem_type	A vx_memory_type_e enumeration that specifies the type of the memory where the LUT is requested to be mapped.
[in]	flags	An integer that allows passing options to the map operation. Use 0 for this option.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	lut is not a valid vx_lut reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Postcondition

vxUnmapLUT with same (*map_id) value.

◆ vxMapRemapPatch()

VX_API_ENTRY vx_status VX_API_CALL vxMapRemapPatch	(	vx_remap	remap,
		const vx_rectangle_t *	rect,
		vx_map_id *	map_id,
		vx_size *	stride_y,
		void **	ptr,
		vx_enum	coordinate_type,
		vx_enum	usage,
		vx_enum	mem_type
	)

Allows the application to get direct access to a rectangular patch of a remap object.

The patch is specified within the destination dimensions and its data provide the corresponding coordinate within the source dimensions. The patch is mapped as a 2D array of elements of the type associated with the coordinate_type parameter (i.e., vx_coordinates2df_t for VX_TYPE_COORDINATES2DF). The memory layout of the mapped 2D array follows a row-major order where rows are compact (without any gap between elements), and where the potential padding after each lines is determined by (* stride_y).

Parameters

[in]	remap	The reference to the remap object that contains the patch to map.
[in]	rect	The coordinates of remap patch. The patch must be specified within the bounds of the remap destination dimensions (VX_REMAP_DESTINATION_WIDTH x VX_REMAP_DESTINATION_HEIGHT). (start_x, start_y) gives the coordinate of the topleft element inside the patch, while (end_x, end_y) gives the coordinate of the bottomright element out of the patch.
[out]	map_id	The address of a vx_map_id variable where the function returns a map identifier. (*map_id) must eventually be provided as the map_id parameter of a call to vxUnmapRemapPatch.
[out]	stride_y	The address of a vx_size variable where the function returns the difference between the address of the first element of two successive lines in the mapped remap patch. The stride value follows the following rule : (*stride_y) >= sizeof(<ELEMENT_TYPE>) * (rect->end_x - rect->start_x)
[out]	ptr	The address of a pointer where the function returns where remap patch data can be accessed. (*ptr) is the address of the the top-left element of the remap patch. The returned (*ptr) address is only valid between the call to this function and the corresponding call to vxUnmapRemapPatch.
[in]	coordinate_type	This declares the type of the source coordinate data that the application wants to access in the remap patch. It must be VX_TYPE_COORDINATES2DF.
[in]	usage	This declares the access mode for the remap patch, using the vx_accessor_e enumeration. VX_READ_ONLY: after the function call, the content of the memory location pointed by (*ptr) contains the remap patch data. Writing into this memory location is forbidden and its behavior is undefined. VX_READ_AND_WRITE: after the function call, the content of the memory location pointed by (*ptr) contains the remap patch data; writing into this memory is allowed for the location of elements only and will result in a modification of the written elements in the remap object once the patch is unmapped. Writing into a gap between element lines (when (*stride_y) > sizeof(<ELEMENT_TYPE>) * (rect->end_x - rect->start_x)) is forbidden and its behavior is undefined. VX_WRITE_ONLY: after the function call, the memory location pointed by (*ptr) contains undefined data; writing each element of the patch is required prior to unmapping. Elements not written by the application before unmap will become undefined after unmap, even if they were well defined before map. Like for VX_READ_AND_WRITE, writing into a gap between element lines is forbidden and its behavior is undefined.
[in]	mem_type	A vx_memory_type_e enumeration that specifies the type of the memory where the remap patch is requested to be mapped.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	remap is not a valid vx_remap reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Postcondition

vxUnmapRemapPatch with same (*map_id) value.

◆ vxMapTensorPatch()

VX_API_ENTRY vx_status VX_API_CALL vxMapTensorPatch	(	vx_tensor	tensor,
		vx_size	number_of_dims,
		const vx_size *	view_start,
		const vx_size *	view_end,
		vx_map_id *	map_id,
		vx_size *	stride,
		void **	ptr,
		vx_enum	usage,
		vx_enum	mem_type
	)

Allows the application to get direct access to a patch of tensor object.

Parameters

[in]	tensor	The reference to the tensor object that is the source or the destination for direct access.
[in]	number_of_dims	The number of dimensions. Must be same as tensor number_of_dims.
[in]	view_start	Array of patch start points in each dimension. This is optional parameter and will be zero when NULL.
[in]	view_end	Array of patch end points in each dimension. This is optional parameter and will be dims[] of tensor when NULL.
[out]	map_id	The address of a vx_map_id variable where the function returns a map identifier. (*map_id) must eventually be provided as the map_id parameter of a call to vxUnmapTensorPatch.
[out]	stride	An array of stride in all dimensions in bytes. The stride value at index 0 must be size of the tensor data element type.
[out]	ptr	The address of a pointer that the function sets to the address where the requested data can be accessed. The returned (*ptr) address is only valid between the call to the function and the corresponding call to vxUnmapTensorPatch.
[in]	usage	This declares the access mode for the tensor patch, using the vx_accessor_e enumeration. VX_READ_ONLY: after the function call, the content of the memory location pointed by (*ptr) contains the tensor patch data. Writing into this memory location is forbidden and its behavior is undefined. VX_READ_AND_WRITE : after the function call, the content of the memory location pointed by (*ptr) contains the tensor patch data; writing into this memory is allowed only for the location of items and will result in a modification of the affected items in the tensor object once the range is unmapped. Writing into a gap between items (when (*stride) > item size in bytes) is forbidden and its behavior is undefined. VX_WRITE_ONLY: after the function call, the memory location pointed by (*ptr) contains undefined data; writing each item of the range is required prior to unmapping. Items not written by the application before unmap will become undefined after unmap, even if they were well defined before map. Like for VX_READ_AND_WRITE, writing into a gap between items is forbidden and its behavior is undefined.
[in]	mem_type	A vx_memory_type_e enumeration that specifies the type of the memory where the tensor patch is requested to be mapped.

Returns

A vx_status_e enumeration.

Return values

VX_ERROR_OPTIMIZED_AWAY	This is a reference to a virtual tensor that cannot be accessed by the application.
VX_ERROR_INVALID_REFERENCE	The tensor reference is not actually an tensor reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.
VX_ERROR_NO_MEMORY	Internal memory allocation failed.

Postcondition

vxUnmapTensorPatch with same (*map_id) value.

◆ vxProcessGraph()

VX_API_ENTRY vx_status VX_API_CALL vxProcessGraph

(

vx_graph

graph

)

This function causes the synchronous processing of a graph. If the graph has not been verified, then the implementation verifies the graph immediately. If verification fails this function returns a status identical to what vxVerifyGraph would return. After the graph verfies successfully then processing occurs. If the graph was previously verified via vxVerifyGraph or vxProcessGraph then the graph is processed. This function blocks until the graph is completed.

Parameters

[in]

graph

The graph to execute.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Graph has been processed; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference.
VX_FAILURE	A catastrophic error occurred during processing.

◆ vxQueryArray()

VX_API_ENTRY vx_status VX_API_CALL vxQueryArray	(	vx_array	arr,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries the Array for some specific information.

Parameters

[in]	arr	The reference to the Array.
[in]	attribute	The attribute to query. Use a vx_array_attribute_e.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	arr is not a valid vx_array reference.
VX_ERROR_NOT_SUPPORTED	If the attribute is not a value supported on this implementation.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

◆ vxQueryContext()

VX_API_ENTRY vx_status VX_API_CALL vxQueryContext	(	vx_context	context,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries the context for some specific information.

Parameters

[in]	context	The reference to the context.
[in]	attribute	The attribute to query. Use a vx_context_attribute_e.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	context is not a valid vx_context reference.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.
VX_ERROR_NOT_SUPPORTED	If the attribute is not supported on this implementation.

◆ vxQueryConvolution()

VX_API_ENTRY vx_status VX_API_CALL vxQueryConvolution	(	vx_convolution	conv,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries an attribute on the convolution matrix object.

Parameters

[in]	conv	The convolution matrix object to set.
[in]	attribute	The attribute to query. Use a vx_convolution_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	conv is not a valid vx_convolution reference.

◆ vxQueryDelay()

VX_API_ENTRY vx_status VX_API_CALL vxQueryDelay	(	vx_delay	delay,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries a vx_delay object attribute.

Parameters

[in]	delay	The reference to a delay object.
[in]	attribute	The attribute to query. Use a vx_delay_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	delay is not a valid vx_delay reference.

◆ vxQueryDistribution()

VX_API_ENTRY vx_status VX_API_CALL vxQueryDistribution	(	vx_distribution	distribution,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries a Distribution object.

Parameters

[in]	distribution	The reference to the distribution to query.
[in]	attribute	The attribute to query. Use a vx_distribution_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	distribution is not a valid vx_distribution reference.

◆ vxQueryGraph()

VX_API_ENTRY vx_status VX_API_CALL vxQueryGraph	(	vx_graph	graph,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Allows the user to query attributes of the Graph.

Parameters

[in]	graph	The reference to the created graph.
[in]	attribute	The vx_graph_attribute_e type needed.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference.

◆ vxQueryImage()

VX_API_ENTRY vx_status VX_API_CALL vxQueryImage	(	vx_image	image,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Retrieves various attributes of an image.

Parameters

[in]	image	The reference to the image to query.
[in]	attribute	The attribute to query. Use a vx_image_attribute_e.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.
VX_ERROR_NOT_SUPPORTED	If the attribute is not supported on this implementation.

◆ vxQueryKernel()

VX_API_ENTRY vx_status VX_API_CALL vxQueryKernel	(	vx_kernel	kernel,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

This allows the client to query the kernel to get information about the number of parameters, enum values, etc.

Parameters

[in]	kernel	The kernel reference to query.
[in]	attribute	The attribute to query. Use a vx_kernel_attribute_e.
[out]	ptr	The pointer to the location at which to store the resulting value.
[in]	size	The size of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	kernel is not a valid vx_kernel reference.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.
VX_ERROR_NOT_SUPPORTED	If the attribute value is not supported in this implementation.

◆ vxQueryLUT()

VX_API_ENTRY vx_status VX_API_CALL vxQueryLUT	(	vx_lut	lut,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries attributes from a LUT.

Parameters

[in]	lut	The LUT to query.
[in]	attribute	The attribute to query. Use a vx_lut_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	lut is not a valid vx_lut reference.

◆ vxQueryMatrix()

VX_API_ENTRY vx_status VX_API_CALL vxQueryMatrix	(	vx_matrix	mat,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries an attribute on the matrix object.

Parameters

[in]	mat	The matrix object to set.
[in]	attribute	The attribute to query. Use a vx_matrix_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	mat is not a valid vx_matrix reference.

◆ vxQueryMetaFormatAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxQueryMetaFormatAttribute	(	vx_meta_format	meta,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

This function allows a user to query the attributes of a vx_meta_format object in a kernel parameter.

The vx_meta_format object contains two types of information: data object meta data and some specific information that defines how the valid region of an image changes

The meta data attributes that can be queried are identified by this list:

• vx_image : VX_IMAGE_FORMAT, VX_IMAGE_HEIGHT, VX_IMAGE_WIDTH
• vx_array : VX_ARRAY_CAPACITY, VX_ARRAY_ITEMTYPE
• vx_pyramid : VX_PYRAMID_FORMAT, VX_PYRAMID_HEIGHT, VX_PYRAMID_WIDTH, VX_PYRAMID_LEVELS, VX_PYRAMID_SCALE
• vx_scalar : VX_SCALAR_TYPE
• vx_matrix : VX_MATRIX_TYPE, VX_MATRIX_ROWS, VX_MATRIX_COLUMNS
• vx_distribution : VX_DISTRIBUTION_BINS, VX_DISTRIBUTION_OFFSET, VX_DISTRIBUTION_RANGE
• vx_remap : VX_REMAP_SOURCE_WIDTH, VX_REMAP_SOURCE_HEIGHT, VX_REMAP_DESTINATION_WIDTH, VX_REMAP_DESTINATION_HEIGHT
• vx_lut : VX_LUT_TYPE, VX_LUT_COUNT
• vx_threshold : VX_THRESHOLD_TYPE, VX_THRESHOLD_INPUT_FORMAT, VX_THRESHOLD_INPUT_FORMAT
• vx_object_array : VX_OBJECT_ARRAY_NUMITEMS, VX_OBJECT_ARRAY_ITEMTYPE
• vx_tensor : VX_TENSOR_NUMBER_OF_DIMS, VX_TENSOR_DIMS, VX_TENSOR_DATA_TYPE, VX_TENSOR_FIXED_POINT_POSITION
• VX_VALID_RECT_CALLBACK

  Note

  For vx_image, a specific attribute can be used to query the valid region evolution. This information is not a meta data.

  Parameters

  [in]	meta	The reference to the vx_meta_format struct to query
  [in]	attribute	Use the subset of data object attributes that define the meta data of this object or attributes from vx_meta_format.
  [out]	ptr	The output pointer of the value to query on the meta format object.
  [in]	size	The size in bytes of the object to which ptr points.

  Returns

  A vx_status_e enumeration.

  Return values

  VX_SUCCESS	The attribute was returned; any other value indicates failure.
  VX_ERROR_INVALID_REFERENCE	meta is not a valid vx_meta_format reference.
  VX_ERROR_INVALID_PARAMETERS	size was not correct for the type needed.
  VX_ERROR_NOT_SUPPORTED	the object attribute was not supported on the meta format object.
  VX_ERROR_INVALID_TYPE	attribute type did not match known meta format type.

◆ vxQueryNode()

VX_API_ENTRY vx_status VX_API_CALL vxQueryNode	(	vx_node	node,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Allows a user to query information out of a node.

Parameters

[in]	node	The reference to the node to query.
[in]	attribute	Use vx_node_attribute_e value to query for information.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytesin bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	node is not a valid vx_node reference.
VX_ERROR_INVALID_PARAMETERS	The type or size is incorrect.

◆ vxQueryObjectArray()

VX_API_ENTRY vx_status VX_API_CALL vxQueryObjectArray	(	vx_object_array	arr,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries an atribute from the ObjectArray.

Parameters

[in]	arr	The reference to the ObjectArray.
[in]	attribute	The attribute to query. Use a vx_object_array_attribute_e.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	arr is not a valid vx_object_array reference.
VX_ERROR_NOT_SUPPORTED	If the attribute is not a value supported on this implementation.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

◆ vxQueryParameter()

VX_API_ENTRY vx_status VX_API_CALL vxQueryParameter	(	vx_parameter	parameter,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Allows the client to query a parameter to determine its meta-information.

Parameters

[in]	parameter	The reference to the parameter.
[in]	attribute	The attribute to query. Use a vx_parameter_attribute_e.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	parameter is not a valid vx_parameter reference.

◆ vxQueryPyramid()

VX_API_ENTRY vx_status VX_API_CALL vxQueryPyramid	(	vx_pyramid	pyr,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries an attribute from an image pyramid.

Parameters

[in]	pyr	The pyramid to query.
[in]	attribute	The attribute for which to query. Use a vx_pyramid_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	pyr is not a valid vx_pyramid reference.

◆ vxQueryReference()

VX_API_ENTRY vx_status VX_API_CALL vxQueryReference	(	vx_reference	ref,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries any reference type for some basic information like count or type.

Parameters

[in]	ref	The reference to query.
[in]	attribute	The value for which to query. Use vx_reference_attribute_e.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	ref is not a valid vx_reference reference.

◆ vxQueryRemap()

VX_API_ENTRY vx_status VX_API_CALL vxQueryRemap	(	vx_remap	table,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries attributes from a Remap table.

Parameters

[in]	table	The remap to query.
[in]	attribute	The attribute to query. Use a vx_remap_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	table is not a valid vx_remap reference.

◆ vxQueryScalar()

VX_API_ENTRY vx_status VX_API_CALL vxQueryScalar	(	vx_scalar	scalar,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries attributes from a scalar.

Parameters

[in]	scalar	The scalar object.
[in]	attribute	The enumeration to query. Use a vx_scalar_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	scalar is not a valid vx_scalar reference.

◆ vxQueryTensor()

VX_API_ENTRY vx_status VX_API_CALL vxQueryTensor	(	vx_tensor	tensor,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Retrieves various attributes of a tensor data.

Parameters

[in]	tensor	The reference to the tensor data to query.
[in]	attribute	The attribute to query. Use a vx_tensor_attribute_e.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors.
VX_ERROR_INVALID_REFERENCE	If data is not a vx_tensor.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

◆ vxQueryThreshold()

VX_API_ENTRY vx_status VX_API_CALL vxQueryThreshold	(	vx_threshold	thresh,
		vx_enum	attribute,
		void *	ptr,
		vx_size	size
	)

Queries an attribute on the threshold object.

Parameters

[in]	thresh	The threshold object to set.
[in]	attribute	The attribute to query. Use a vx_threshold_attribute_e enumeration.
[out]	ptr	The location at which to store the resulting value.
[in]	size	The size of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	thresh is not a valid vx_threshold reference.

◆ vxRegisterAutoAging()

VX_API_ENTRY vx_status VX_API_CALL vxRegisterAutoAging	(	vx_graph	graph,
		vx_delay	delay
	)

Register a delay for auto-aging.

This function registers a delay object to be auto-aged by the graph. This delay object will be automatically aged after each successful completion of this graph. Aging of a delay object cannot be called during graph execution. A graph abandoned due to a node callback will trigger an auto-aging.

If a delay is registered for auto-aging multiple times in a same graph, the delay will be only aged a single time at each graph completion. If a delay is registered for auto-aging in multiple graphs, this delay will aged automatically after each successful completion of any of these graphs.

Parameters

[in]	graph	The graph to which the delay is registered for auto-aging.
[in]	delay	The delay to automatically age.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference, or delay is not a valid vx_delay reference.

◆ vxRegisterKernelLibrary()

VX_API_ENTRY vx_status VX_API_CALL vxRegisterKernelLibrary	(	vx_context	context,
		const vx_char *	module,
		vx_publish_kernels_f	publish,
		vx_unpublish_kernels_f	unpublish
	)

Registers a module with kernels in a context.

This function registers the appropriate publish and unpublish functions with the module name if the module is not a dynamic library, so vxLoadKernels and vxUnloadKernels can be called.

Parameters

[in]	context	The reference to the context the kernels must be added to.
[in]	module	The short name of the module to load.
[in]	publish	must add kernels to the context by calling vxAddUserKernel for each new kernel. It is called by vxLoadKernels.
[in]	unpublish	must remove kernels from the context by calling vxRemoveKernel for each kernel the vxPublishKernels has added. It is called by vxUnloadKernels.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	context is not a valid vx_context reference.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

See also

vxLoadKernels

◆ vxRegisterLogCallback()

VX_API_ENTRY void VX_API_CALL vxRegisterLogCallback	(	vx_context	context,
		vx_log_callback_f	callback,
		vx_bool	reentrant
	)

Registers a callback facility to the OpenVX implementation to receive error logs.

Parameters

[in]	context	The overall context to OpenVX.
[in]	callback	The callback function. If NULL, the previous callback is removed.
[in]	reentrant	If reentrancy flag is vx_true_e, then the callback may be entered from multiple simultaneous tasks or threads (if the host OS supports this).

◆ vxRegisterUserStruct()

VX_API_ENTRY vx_enum VX_API_CALL vxRegisterUserStruct	(	vx_context	context,
		vx_size	size
	)

Registers user-defined structures to the context.

Parameters

[in]	context	The reference to the implementation context.
[in]	size	The size of user struct in bytes.

Returns

A vx_enum value that is a type given to the User to refer to their custom structure when declaring a vx_array of that structure.

Return values

VX_TYPE_INVALID

If the namespace of types has been exhausted.

Note

This call should only be used once within the lifetime of a context for a specific structure.

◆ vxRegisterUserStructWithName()

VX_API_ENTRY vx_enum VX_API_CALL vxRegisterUserStructWithName	(	vx_context	context,
		vx_size	size,
		const vx_char *	type_name
	)

Registers user-defined structures to the context, and associates a name to it.

Parameters

[in]	context	The reference to the implementation context.
[in]	size	The size of user struct in bytes.
[in]	type_name	Pointer to the '\0' terminated string that identifies the user struct type. The string is copied by the function so that it stays the property of the caller. NULL means that the user struct is not named. The length of the string shall be lower than VX_MAX_REFERENCE_NAME bytes.

Returns

A vx_enum value that is a type given to the User to refer to their custom structure when declaring a vx_array of that structure.

Return values

VX_TYPE_INVALID

If the namespace of types has been exhausted.

Note

This call should only be used once within the lifetime of a context for a specific structure.

◆ vxReleaseArray()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseArray

(

vx_array *

arr

)

Releases a reference of an Array object. The object may not be garbage collected until its total reference count is zero. After returning from this function the reference is zeroed.

Parameters

[in]

arr

The pointer to the Array to release.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	arr is not a valid vx_array reference.

◆ vxReleaseContext()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseContext

(

vx_context *

context

)

Releases the OpenVX object context.

All reference counted objects are garbage-collected by the return of this call. No calls are possible using the parameter context after the context has been released until a new reference from vxCreateContext is returned. All outstanding references to OpenVX objects from this context are invalid after this call.

Parameters

[in]

context

The pointer to the reference to the context.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	context is not a valid vx_context reference.

Precondition

vxCreateContext

◆ vxReleaseConvolution()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseConvolution

(

vx_convolution *

conv

)

Releases the reference to a convolution matrix. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

conv

The pointer to the convolution matrix to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	conv is not a valid vx_convolution reference.

◆ vxReleaseDelay()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseDelay

(

vx_delay *

delay

)

Releases a reference to a delay object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

delay

The pointer to the delay object reference to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	delay is not a valid vx_delay reference.

◆ vxReleaseDistribution()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseDistribution

(

vx_distribution *

distribution

)

Releases a reference to a distribution object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

distribution

The reference to the distribution to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	distribution is not a valid vx_distribution reference.

◆ vxReleaseGraph()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseGraph

(

vx_graph *

graph

)

Releases a reference to a graph. The object may not be garbage collected until its total reference count is zero. Once the reference count is zero, all node references in the graph are automatically released as well. Releasing the graph will only release the nodes if the nodes were not previously released by the application. Data referenced by those nodes may not be released as the user may still have references to the data.

Parameters

[in]

graph

The pointer to the graph to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference.

◆ vxReleaseImage()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseImage

(

vx_image *

image

)

Releases a reference to an image object. The object may not be garbage collected until its total reference count is zero.

An implementation may defer the actual object destruction after its total reference count is zero (potentially until context destruction). Thus, releasing an image created from handle (see vxCreateImageFromHandle) and all others objects that may reference it (nodes, ROI, or channel for instance) are not sufficient to get back the ownership of the memory referenced by the current image handle. The only way for this is to call vxSwapImageHandle) before releasing the image.

Parameters

[in]

image

The pointer to the image to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference.

◆ vxReleaseKernel()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseKernel

(

vx_kernel *

kernel

)

Release the reference to the kernel. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

kernel

The pointer to the kernel reference to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	kernel is not a valid vx_kernel reference.

◆ vxReleaseLUT()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseLUT

(

vx_lut *

lut

)

Releases a reference to a LUT object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

lut

The pointer to the LUT to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	lut is not a valid vx_lut reference.

◆ vxReleaseMatrix()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseMatrix

(

vx_matrix *

mat

)

Releases a reference to a matrix object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

mat

The matrix reference to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	mat is not a valid vx_matrix reference.

◆ vxReleaseNode()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseNode

(

vx_node *

node

)

Releases a reference to a Node object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

node

The pointer to the reference of the node to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	node is not a valid vx_node reference.

◆ vxReleaseObjectArray()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseObjectArray

(

vx_object_array *

arr

)

Releases a reference of an ObjectArray object.

The object may not be garbage collected until its total reference and its contained objects count is zero. After returning from this function the reference is zeroed/cleared.

Parameters

[in]

arr

The pointer to the ObjectArray to release.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	arr is not a valid vx_object_array reference.

◆ vxReleaseParameter()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseParameter

(

vx_parameter *

param

)

Releases a reference to a parameter object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

param

The pointer to the parameter to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	param is not a valid vx_parameter reference.

◆ vxReleasePyramid()

VX_API_ENTRY vx_status VX_API_CALL vxReleasePyramid

(

vx_pyramid *

pyr

)

Releases a reference to a pyramid object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

pyr

The pointer to the pyramid to release.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	pyr is not a valid vx_pyramid reference.

Postcondition

After returning from this function the reference is zeroed.

◆ vxReleaseReference()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseReference

(

vx_reference *

ref_ptr

)

Releases a reference. The reference may potentially refer to multiple OpenVX objects of different types. This function can be used instead of calling a specific release function for each individual object type (e.g. vxRelease<object>). The object will not be destroyed until its total reference count is zero.

Note

After returning from this function the reference is zeroed.

Parameters

[in]

ref_ptr

The pointer to the reference of the object to release.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	ref_ptr is not a valid vx_reference reference.

◆ vxReleaseRemap()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseRemap

(

vx_remap *

table

)

Releases a reference to a remap table object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

table

The pointer to the remap table to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	table is not a valid vx_remap reference.

◆ vxReleaseScalar()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseScalar

(

vx_scalar *

scalar

)

Releases a reference to a scalar object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

scalar

The pointer to the scalar to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	scalar is not a valid vx_scalar reference.

◆ vxReleaseTensor()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseTensor

(

vx_tensor *

tensor

)

Releases a reference to a tensor data object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

tensor

The pointer to the tensor data to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; all other values indicate failure
*	An error occurred. See vx_status_e.

◆ vxReleaseThreshold()

VX_API_ENTRY vx_status VX_API_CALL vxReleaseThreshold

(

vx_threshold *

thresh

)

Releases a reference to a threshold object. The object may not be garbage collected until its total reference count is zero.

Parameters

[in]

thresh

The pointer to the threshold to release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	thresh is not a valid vx_threshold reference.

◆ vxRemoveKernel()

VX_API_ENTRY vx_status VX_API_CALL vxRemoveKernel

(

vx_kernel

kernel

)

Removes a custom kernel from its context and releases it.

Parameters

[in]

kernel

The reference to the kernel to remove. Returned from vxAddUserKernel.

Note

Any kernel enumerated in the base standard cannot be removed; only kernels added through vxAddUserKernel can be removed.

Returns

A vx_status_e enumeration. The function returns to the application full control over the memory resources provided at the kernel creation time.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	kernel is not a valid vx_kernel reference.
VX_ERROR_INVALID_PARAMETERS	If a base kernel is passed in.
VX_FAILURE	If the application has not released all references to the kernel object OR if the application has not released all references to a node that is using this kernel OR if the application has not released all references to a graph which has nodes that is using this kernel.

◆ vxRemoveNode()

VX_API_ENTRY vx_status VX_API_CALL vxRemoveNode

(

vx_node *

node

)

Removes a Node from its parent Graph and releases it.

Parameters

[in]

node

The pointer to the node to remove and release.

Postcondition

After returning from this function the reference is zeroed.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	node is not a valid vx_node reference.

◆ vxReplicateNode()

VX_API_ENTRY vx_status VX_API_CALL vxReplicateNode	(	vx_graph	graph,
		vx_node	first_node,
		vx_bool	replicate[],
		vx_uint32	number_of_parameters
	)

Creates replicas of the same node first_node to process a set of objects stored in vx_pyramid or vx_object_array. first_node needs to have as parameter levels 0 of a vx_pyramid or the index 0 of a vx_object_array. Replica nodes are not accessible by the application through any means. An application request for removal of first_node from the graph will result in removal of all replicas. Any change of parameter or attribute of first_node will be propagated to the replicas. vxVerifyGraph shall enforce consistency of parameters and attributes in the replicas.

Parameters

[in]	graph	The reference to the graph.
[in]	first_node	The reference to the node in the graph that will be replicated.
[in]	replicate	an array of size equal to the number of node parameters, vx_true_e for the parameters that should be iterated over (should be a reference to a vx_pyramid or a vx_object_array), vx_false_e for the parameters that should be the same across replicated nodes and for optional parameters that are not used. Should be vx_true_e for all output parameters.
[in]	number_of_parameters	number of elements in the replicate array

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference, or first_node is not a valid vx_node reference.
VX_ERROR_NOT_COMPATIBLE	At least one of replicated parameters is not of level 0 of a pyramid or at index 0 of an object array.
VX_FAILURE	If the node does not belong to the graph, or the number of objects in the parent objects of inputs and output are not the same.

◆ vxRetainReference()

VX_API_ENTRY vx_status VX_API_CALL vxRetainReference

(

vx_reference

ref

)

Increments the reference counter of an object This function is used to express the fact that the OpenVX object is referenced multiple times by an application. Each time this function is called for an object, the application will need to release the object one additional time before it can be destructed.

Parameters

[in]

ref

The reference to retain.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	ref is not a valid vx_reference reference.

◆ vxRetrieveNodeCallback()

VX_API_ENTRY vx_nodecomplete_f VX_API_CALL vxRetrieveNodeCallback

(

vx_node

node

)

Retrieves the current node callback function pointer set on the node.

Parameters

[in]

node

The reference to the vx_node object.

Returns

vx_nodecomplete_f The pointer to the callback function.

Return values

NULL	No callback is set.
*	The node callback function.

◆ vxScheduleGraph()

VX_API_ENTRY vx_status VX_API_CALL vxScheduleGraph

(

vx_graph

graph

)

Schedules a graph for future execution. If the graph has not been verified, then the implementation verifies the graph immediately. If verification fails this function returns a status identical to what vxVerifyGraph would return. After the graph verfies successfully then processing occurs. If the graph was previously verified via vxVerifyGraph or vxProcessGraph then the graph is processed.

Parameters

[in]

graph

The graph to schedule.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	The graph has been scheduled; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference.
VX_ERROR_NO_RESOURCES	The graph cannot be scheduled now.
VX_ERROR_NOT_SUFFICIENT	The graph is not verified and has failed forced verification.

◆ vxSetContextAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxSetContextAttribute	(	vx_context	context,
		vx_enum	attribute,
		const void *	ptr,
		vx_size	size
	)

Sets an attribute on the context.

Parameters

[in]	context	The handle to the overall context.
[in]	attribute	The attribute to set from vx_context_attribute_e.
[in]	ptr	The pointer to the data to which to set the attribute.
[in]	size	The size in bytes of the data to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	context is not a valid vx_context reference.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.
VX_ERROR_NOT_SUPPORTED	If the attribute is not settable.

◆ vxSetConvolutionAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxSetConvolutionAttribute	(	vx_convolution	conv,
		vx_enum	attribute,
		const void *	ptr,
		vx_size	size
	)

Sets attributes on the convolution object.

Parameters

[in]	conv	The coordinates object to set.
[in]	attribute	The attribute to modify. Use a vx_convolution_attribute_e enumeration.
[in]	ptr	The pointer to the value to which to set the attribute.
[in]	size	The size in bytes of the data pointed to by ptr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	conv is not a valid vx_convolution reference.

◆ vxSetGraphAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxSetGraphAttribute	(	vx_graph	graph,
		vx_enum	attribute,
		const void *	ptr,
		vx_size	size
	)

Allows the attributes of the Graph to be set to the provided value.

Parameters

[in]	graph	The reference to the graph.
[in]	attribute	The vx_graph_attribute_e type needed.
[in]	ptr	The location from which to read the value.
[in]	size	The size in bytes of the container to which ptr points.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference.

◆ vxSetGraphParameterByIndex()

VX_API_ENTRY vx_status VX_API_CALL vxSetGraphParameterByIndex	(	vx_graph	graph,
		vx_uint32	index,
		vx_reference	value
	)

Sets a reference to the parameter on the graph. The implementation must set this parameter on the originating node as well.

Parameters

[in]	graph	The graph reference.
[in]	index	The parameter index.
[in]	value	The reference to set to the parameter.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Parameter set to Graph; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference or value is not a valid vx_reference.
VX_ERROR_INVALID_PARAMETERS	The parameter index is out of bounds or the dir parameter is incorrect.

◆ vxSetImageAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxSetImageAttribute	(	vx_image	image,
		vx_enum	attribute,
		const void *	ptr,
		vx_size	size
	)

Allows setting attributes on the image.

Parameters

[in]	image	The reference to the image on which to set the attribute.
[in]	attribute	The attribute to set. Use a vx_image_attribute_e enumeration.
[in]	ptr	The pointer to the location from which to read the value.
[in]	size	The size in bytes of the object pointed to by ptr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

◆ vxSetImagePixelValues()

VX_API_ENTRY vx_status VX_API_CALL vxSetImagePixelValues	(	vx_image	image,
		const vx_pixel_value_t *	pixel_value
	)

Initialize an image with the given pixel value.

Parameters

[in]	image	The reference to the image to initialize.
[in]	pixel_value	The pointer to the constant pixel value to initialize all image pixels. See vx_pixel_value_t.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors.
VX_ERROR_INVALID_REFERENCE	If the image is a uniform image, a virtual image, or not a vx_image.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

Note

All pixels of the entire image are initialized to the indicated pixel value, independently from the valid region. The valid region of the image is unaffected by this function. The image remains mutable after the call to this function, so its pixels and mutable attributes may be changed by subsequent functions.

◆ vxSetImageValidRectangle()

VX_API_ENTRY vx_status VX_API_CALL vxSetImageValidRectangle	(	vx_image	image,
		const vx_rectangle_t *	rect
	)

Sets the valid rectangle for an image according to a supplied rectangle.

Note

Setting or changing the valid region from within a user node by means other than the call-back, for example by calling vxSetImageValidRectangle, might result in an incorrect valid region calculation by the framework.

Parameters

[in]	image	The reference to the image.
[in]	rect	The value to be set to the image valid rectangle. A NULL indicates that the valid region is the entire image.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference.
VX_ERROR_INVALID_PARAMETERS	The rect does not define a proper valid rectangle.

◆ vxSetImmediateModeTarget()

VX_API_ENTRY vx_status VX_API_CALL vxSetImmediateModeTarget	(	vx_context	context,
		vx_enum	target_enum,
		const char *	target_string
	)

Sets the default target of the immediate mode. Upon successful execution of this function any future execution of immediate mode function is attempted on the new default target of the context.

Parameters

[in]	context	The reference to the implementation context.
[in]	target_enum	The default immediate mode target enum to be set to the vx_context object. Use a vx_target_e.
[in]	target_string	The target name ASCII string. This contains a valid value when target_enum is set to VX_TARGET_STRING, otherwise it is ignored.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Default target set; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	If the context is not a valid vx_context reference.
VX_ERROR_NOT_SUPPORTED	If the specified target is not supported in this context.

◆ vxSetKernelAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxSetKernelAttribute	(	vx_kernel	kernel,
		vx_enum	attribute,
		const void *	ptr,
		vx_size	size
	)

Sets kernel attributes.

Parameters

[in]	kernel	The reference to the kernel.
[in]	attribute	The enumeration of the attributes. See vx_kernel_attribute_e.
[in]	ptr	The pointer to the location from which to read the attribute.
[in]	size	The size in bytes of the data area indicated by ptr in bytes.

Note

After a kernel has been passed to vxFinalizeKernel, no attributes can be altered.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	kernel is not a valid vx_kernel reference.

◆ vxSetMetaFormatAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxSetMetaFormatAttribute	(	vx_meta_format	meta,
		vx_enum	attribute,
		const void *	ptr,
		vx_size	size
	)

This function allows a user to set the attributes of a vx_meta_format object in a kernel output validator.

The vx_meta_format object contains two types of information: data object meta data and some specific information that defines how the valid region of an image changes

The meta data attributes that can be set are identified by this list:

• vx_image : VX_IMAGE_FORMAT, VX_IMAGE_HEIGHT, VX_IMAGE_WIDTH
• vx_array : VX_ARRAY_CAPACITY, VX_ARRAY_ITEMTYPE
• vx_pyramid : VX_PYRAMID_FORMAT, VX_PYRAMID_HEIGHT, VX_PYRAMID_WIDTH, VX_PYRAMID_LEVELS, VX_PYRAMID_SCALE
• vx_scalar : VX_SCALAR_TYPE
• vx_matrix : VX_MATRIX_TYPE, VX_MATRIX_ROWS, VX_MATRIX_COLUMNS
• vx_distribution : VX_DISTRIBUTION_BINS, VX_DISTRIBUTION_OFFSET, VX_DISTRIBUTION_RANGE
• vx_remap : VX_REMAP_SOURCE_WIDTH, VX_REMAP_SOURCE_HEIGHT, VX_REMAP_DESTINATION_WIDTH, VX_REMAP_DESTINATION_HEIGHT
• vx_lut : VX_LUT_TYPE, VX_LUT_COUNT
• vx_threshold : VX_THRESHOLD_TYPE, VX_THRESHOLD_INPUT_FORMAT, VX_THRESHOLD_INPUT_FORMAT
• vx_object_array : VX_OBJECT_ARRAY_NUMITEMS, VX_OBJECT_ARRAY_ITEMTYPE
• vx_tensor : VX_TENSOR_NUMBER_OF_DIMS, VX_TENSOR_DIMS, VX_TENSOR_DATA_TYPE, VX_TENSOR_FIXED_POINT_POSITION
• VX_VALID_RECT_CALLBACK

  Note

  For vx_image, a specific attribute can be used to specify the valid region evolution. This information is not a meta data.

  Parameters

  [in]	meta	The reference to the vx_meta_format struct to set
  [in]	attribute	Use the subset of data object attributes that define the meta data of this object or attributes from vx_meta_format.
  [in]	ptr	The input pointer of the value to set on the meta format object.
  [in]	size	The size in bytes of the object to which ptr points.

  Returns

  A vx_status_e enumeration.

  Return values

  VX_SUCCESS	The attribute was set; any other value indicates failure.
  VX_ERROR_INVALID_REFERENCE	meta is not a valid vx_meta_format reference.
  VX_ERROR_INVALID_PARAMETERS	size was not correct for the type needed.
  VX_ERROR_NOT_SUPPORTED	the object attribute was not supported on the meta format object.
  VX_ERROR_INVALID_TYPE	attribute type did not match known meta format type.

◆ vxSetMetaFormatFromReference()

VX_API_ENTRY vx_status VX_API_CALL vxSetMetaFormatFromReference	(	vx_meta_format	meta,
		vx_reference	exemplar
	)

Set a meta format object from an exemplar data object reference.

This function sets a vx_meta_format object from the meta data of the exemplar

Parameters

[in]	meta	The meta format object to set
[in]	exemplar	The exemplar data object.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	The meta format was correctly set; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	meta is not a valid vx_meta_format reference, or exemplar is not a valid vx_reference reference.

◆ vxSetNodeAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxSetNodeAttribute	(	vx_node	node,
		vx_enum	attribute,
		const void *	ptr,
		vx_size	size
	)

Allows a user to set attribute of a node before Graph Validation.

Parameters

[in]	node	The reference to the node to set.
[in]	attribute	Use vx_node_attribute_e value to set the desired attribute.
[in]	ptr	The pointer to the desired value of the attribute.
[in]	size	The size in bytes of the objects to which ptr points.

Note

Some attributes are inherited from the vx_kernel, which was used to create the node. Some of these can be overridden using this API, notably VX_NODE_LOCAL_DATA_SIZE and VX_NODE_LOCAL_DATA_PTR.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	The attribute was set; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	node is not a valid vx_node reference.
VX_ERROR_INVALID_PARAMETERS	size is not correct for the type needed.

◆ vxSetNodeTarget()

VX_API_ENTRY vx_status VX_API_CALL vxSetNodeTarget	(	vx_node	node,
		vx_enum	target_enum,
		const char *	target_string
	)

Sets the node target to the provided value. A success invalidates the graph that the node belongs to (vxVerifyGraph must be called before the next execution)

Parameters

[in]	node	The reference to the vx_node object.
[in]	target_enum	The target enum to be set to the vx_node object. Use a vx_target_e.
[in]	target_string	The target name ASCII string. This contains a valid value when target_enum is set to VX_TARGET_STRING, otherwise it is ignored.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	Node target set; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	node is not a valid vx_node reference.
VX_ERROR_NOT_SUPPORTED	If the node kernel is not supported by the specified target.

◆ vxSetParameterByIndex()

VX_API_ENTRY vx_status VX_API_CALL vxSetParameterByIndex	(	vx_node	node,
		vx_uint32	index,
		vx_reference	value
	)

Sets the specified parameter data for a kernel on the node.

Parameters

[in]	node	The node that contains the kernel.
[in]	index	The index of the parameter desired.
[in]	value	The desired value of the parameter.

Note

A user may not provide a NULL value for a mandatory parameter of this API.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	node is not a valid vx_node reference, or value is not a valid vx_reference reference.

See also

vxSetParameterByReference

◆ vxSetParameterByReference()

VX_API_ENTRY vx_status VX_API_CALL vxSetParameterByReference	(	vx_parameter	parameter,
		vx_reference	value
	)

Associates a parameter reference and a data reference with a kernel on a node.

Parameters

[in]	parameter	The reference to the kernel parameter.
[in]	value	The value to associate with the kernel parameter.

Note

A user may not provide a NULL value for a mandatory parameter of this API.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	parameter is not a valid vx_parameter reference, or value is not a valid vx_reference reference..

See also

vxGetParameterByIndex

◆ vxSetReferenceName()

VX_API_ENTRY vx_status VX_API_CALL vxSetReferenceName	(	vx_reference	ref,
		const vx_char *	name
	)

Name a reference.

This function is used to associate a name to a referenced object. This name can be used by the OpenVX implementation in log messages and any other reporting mechanisms.

The OpenVX implementation will not check if the name is unique in the reference scope (context or graph). Several references can then have the same name.

Parameters

[in]	ref	The reference to the object to be named.
[in]	name	Pointer to the '\0' terminated string that identifies the referenced object. The string is copied by the function so that it stays the property of the caller. NULL means that the reference is not named. The length of the string shall be lower than VX_MAX_REFERENCE_NAME bytes.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	ref is not a valid vx_reference reference.

◆ vxSetThresholdAttribute()

VX_API_ENTRY vx_status VX_API_CALL vxSetThresholdAttribute	(	vx_threshold	thresh,
		vx_enum	attribute,
		const void *	ptr,
		vx_size	size
	)

Sets attributes on the threshold object.

Parameters

[in]	thresh	The threshold object to set.
[in]	attribute	The attribute to modify. Use a vx_threshold_attribute_e enumeration.
[in]	ptr	The pointer to the value to which to set the attribute.
[in]	size	The size of the data pointed to by ptr.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	thresh is not a valid vx_threshold reference.

◆ vxSwapImageHandle()

VX_API_ENTRY vx_status VX_API_CALL vxSwapImageHandle	(	vx_image	image,
		void *const	new_ptrs[],
		void *	prev_ptrs[],
		vx_size	num_planes
	)

Swaps the image handle of an image previously created from handle.

This function sets the new image handle (i.e. pointer to all image planes) and returns the previous one.

Once this function call has completed, the application gets back the ownership of the memory referenced by the previous handle. This memory contains up-to-date pixel data, and the application can safely reuse or release it.

The memory referenced by the new handle must have been allocated consistently with the image properties since the import type, memory layout and dimensions are unchanged (see addrs, color, and memory_type in vxCreateImageFromHandle).

All images created from ROI or channel with this image as parent or ancestor will automatically use the memory referenced by the new handle.

The behavior of vxSwapImageHandle when called from a user node is undefined.

Parameters

[in]	image	The reference to an image created from handle
[in]	new_ptrs[]	pointer to a caller owned array that contains the new image handle (image plane pointers) new_ptrs is non NULL. new_ptrs[i] must be non NULL for each i such as 0 < i < nbPlanes, otherwise, this is an error. The address of the storage memory for image plane i is set to new_ptrs[i] new_ptrs is NULL: the previous image storage memory is reclaimed by the caller, while no new handle is provided.
[out]	prev_ptrs[]	pointer to a caller owned array in which the application returns the previous image handle prev_ptrs is non NULL. prev_ptrs must have at least as many elements as the number of image planes. For each i such as 0 < i < nbPlanes , prev_ptrs[i] is set to the address of the previous storage memory for plane i. prev_ptrs NULL: the previous handle is not returned.
[in]	num_planes	Number of planes in the image. This must be set equal to the number of planes of the input image. The number of elements in new_ptrs and prev_ptrs arrays must be equal to or greater than num_planes. If either array has more than num_planes elements, the extra elements are ignored. If either array is smaller than num_planes, the results are undefined.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference. reference.
VX_ERROR_INVALID_PARAMETERS	The image was not created from handle or the content of new_ptrs is not valid.
VX_FAILURE	The image was already being accessed.

◆ vxSwapTensorHandle()

VX_API_ENTRY vx_status VX_API_CALL vxSwapTensorHandle	(	vx_tensor	tensor,
		void *	new_ptr,
		void **	prev_ptr
	)

Swaps the tensor handle of an tensor previously created from handle.

This function sets the new tensor handle and returns the previous one.

Once this function call has completed, the application gets back the ownership of the memory referenced by the previous handle. This memory contains up-to-date tensor data, and the application can safely reuse or release it.

The memory referenced by the new handle must have been allocated consistently with the tensor properties since the import type, memory layout and dimensions are unchanged (see stride and memory_type in vxCreateTensorFromHandle).

All tensors created from view with this tensor as parent or ancestor will automatically use the memory referenced by the new handle.

The behavior of vxSwapTensorHandle when called from a user node is undefined.

Parameters

[in]	tensor	The reference to an tensor created from handle.
[in]	new_ptr	new tensor handle If new_ptr is NULL, If the new_ptr is NULL, the previous tensor storage memory is reclaimed by the caller, while no new handle is provided.
[out]	prev_ptr	pointer to return the previous tensor handle. If prev_ptr is NULL, the previous handle is not returned.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors.
VX_ERROR_INVALID_REFERENCE	tensor is not a valid vx_tensor reference. reference.
VX_ERROR_INVALID_PARAMETERS	The tensor was not created from handle or the content of new_ptr is not valid.
VX_FAILURE	The tensor was already being accessed.

◆ vxTruncateArray()

VX_API_ENTRY vx_status VX_API_CALL vxTruncateArray	(	vx_array	arr,
		vx_size	new_num_items
	)

Truncates an Array (remove items from the end).

Parameters

[in,out]	arr	The reference to the Array.
[in]	new_num_items	The new number of items for the Array.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	arr is not a valid vx_array reference.
VX_ERROR_INVALID_PARAMETERS	The new_size is greater than the current size.

◆ vxUnloadKernels()

VX_API_ENTRY vx_status VX_API_CALL vxUnloadKernels	(	vx_context	context,
		const vx_char *	module
	)

Unloads all kernels from the OpenVX context that had been loaded from the module using the vxLoadKernels function.

The kernel unloading is performed by calling the vxUnpublishKernels exported function of the module.

Note

vxUnpublishKernels is defined in the description of vxLoadKernels.

Parameters

[in]	context	The reference to the context the kernels must be removed from.
[in]	module	The short name of the module to unload. On systems where there are specific naming conventions for modules, the name passed should ignore such conventions. For example: libxyz.so should be passed as just xyz and the implementation will do the right thing that the platform requires.

Note

This API uses the system pre-defined paths for modules.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	context is not a valid vx_context reference.
VX_ERROR_INVALID_PARAMETERS	If any of the other parameters are incorrect.

See also

vxLoadKernels

◆ vxUnmapArrayRange()

VX_API_ENTRY vx_status VX_API_CALL vxUnmapArrayRange	(	vx_array	array,
		vx_map_id	map_id
	)

Unmap and commit potential changes to an array object range that was previously mapped. Unmapping an array range invalidates the memory location from which the range could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior.

Parameters

[in]	array	The reference to the array object to unmap.
[out]	map_id	The unique map identifier that was returned when calling vxMapArrayRange .

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	array is not a valid vx_array reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Precondition

vxMapArrayRange returning the same map_id value

◆ vxUnmapDistribution()

VX_API_ENTRY vx_status VX_API_CALL vxUnmapDistribution	(	vx_distribution	distribution,
		vx_map_id	map_id
	)

Unmap and commit potential changes to distribution object that was previously mapped. Unmapping a distribution invalidates the memory location from which the distribution data could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior.

Parameters

[in]	distribution	The reference to the distribution object to unmap.
[out]	map_id	The unique map identifier that was returned when calling vxMapDistribution .

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	distribution is not a valid vx_distribution reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Precondition

vxMapDistribution returning the same map_id value

◆ vxUnmapImagePatch()

VX_API_ENTRY vx_status VX_API_CALL vxUnmapImagePatch	(	vx_image	image,
		vx_map_id	map_id
	)

Unmap and commit potential changes to a image object patch that were previously mapped. Unmapping an image patch invalidates the memory location from which the patch could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior.

Parameters

[in]	image	The reference to the image object to unmap.
[out]	map_id	The unique map identifier that was returned by vxMapImagePatch .

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	image is not a valid vx_image reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Precondition

vxMapImagePatch with same map_id value

◆ vxUnmapLUT()

VX_API_ENTRY vx_status VX_API_CALL vxUnmapLUT	(	vx_lut	lut,
		vx_map_id	map_id
	)

Unmap and commit potential changes to LUT object that was previously mapped. Unmapping a LUT invalidates the memory location from which the LUT data could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior.

Parameters

[in]	lut	The reference to the LUT object to unmap.
[out]	map_id	The unique map identifier that was returned when calling vxMapLUT .

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	lut is not a valid vx_lut reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Precondition

vxMapLUT returning the same map_id value

◆ vxUnmapRemapPatch()

VX_API_ENTRY vx_status VX_API_CALL vxUnmapRemapPatch	(	vx_remap	remap,
		vx_map_id	map_id
	)

Unmap and commit potential changes to a remap object patch that was previously mapped.

Unmapping a remap patch invalidates the memory location from which the patch could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior.

Parameters

[in]	remap	The reference to the remap object to unmap.
[out]	map_id	The unique map identifier that was returned by vxMapRemapPatch .

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	remap is not a valid vx_remap reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Precondition

vxMapRemapPatch with same map_id value

◆ vxUnmapTensorPatch()

VX_API_ENTRY vx_status VX_API_CALL vxUnmapTensorPatch	(	vx_tensor	tensor,
		const vx_map_id	map_id
	)

Unmap and commit potential changes to a tensor object patch that was previously mapped. Unmapping a tensor patch invalidates the memory location from which the patch could be accessed by the application. Accessing this memory location after the unmap function completes has an undefined behavior.

Parameters

[in]	tensor	The reference to the tensor object to unmap.
[in]	map_id	The unique map identifier that was returned when calling vxMapTensorPatch .

Returns

A vx_status_e enumeration.

Return values

VX_ERROR_INVALID_REFERENCE	The tensor reference is not actually an tensor reference.
VX_ERROR_INVALID_PARAMETERS	An other parameter is incorrect.

Precondition

vxMapTensorPatch returning the same map_id value

◆ vxVerifyGraph()

VX_API_ENTRY vx_status VX_API_CALL vxVerifyGraph

(

vx_graph

graph

)

Verifies the state of the graph before it is executed. This is useful to catch programmer errors and contract errors. If not verified, the graph verifies before being processed.

Precondition

Memory for data objects is not guarenteed to exist before this call.

Postcondition

After this call data objects exist unless the implementation optimized them out.

Parameters

[in]

graph

The reference to the graph to verify.

Returns

A status code for graphs with more than one error; it is undefined which error will be returned. Register a log callback using vxRegisterLogCallback to receive each specific error in the graph.

A vx_status_e enumeration.

Return values

VX_SUCCESS	No errors; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference.
VX_ERROR_MULTIPLE_WRITERS	If the graph contains more than one writer to any data object.
VX_ERROR_INVALID_NODE	If a node in the graph is invalid or failed be created.
VX_ERROR_INVALID_GRAPH	If the graph contains cycles or some other invalid topology.
VX_ERROR_INVALID_TYPE	If any parameter on a node is given the wrong type.
VX_ERROR_INVALID_VALUE	If any value of any parameter is out of bounds of specification.
VX_ERROR_INVALID_FORMAT	If the image format is not compatible.

See also

vxProcessGraph

◆ vxWaitGraph()

VX_API_ENTRY vx_status VX_API_CALL vxWaitGraph

(

vx_graph

graph

)

Waits for a specific graph to complete. If the graph has been scheduled multiple times since the last call to vxWaitGraph, then vxWaitGraph returns only when the last scheduled execution completes.

Parameters

[in]

graph

The graph to wait on.

Returns

A vx_status_e enumeration.

Return values

VX_SUCCESS	The graph has successfully completed execution and its outputs are the valid results of the most recent execution; any other value indicates failure.
VX_ERROR_INVALID_REFERENCE	graph is not a valid vx_graph reference.
VX_FAILURE	An error occurred or the graph was never scheduled. Output data of the graph is undefined.

Precondition

vxScheduleGraph