harmony 鸿蒙NativeDisplaySoloist
NativeDisplaySoloist
Overview
The NativeDisplaySoloist module provides the native service that control the frame rate in threads other than the UI thread.
Since: 12
Summary
Files
| Name | Description |
|---|---|
| native_display_soloist.h | Declares the functions for obtaining and using native display soloist. |
Structs
| Name | Description |
|---|---|
| struct DisplaySoloist_ExpectedRateRange | Describes the expected frame rate range. |
Types
| Name | Description |
|---|---|
| typedef struct OH_DisplaySoloist OH_DisplaySoloist | Provides the declaration of an OH_DisplaySoloist struct. |
| typedef void(* OH_DisplaySoloist_FrameCallback) (long long timestamp, long long targetTimestamp, void *data) | Defines the pointer to an OH_DisplaySoloist callback function. |
| typedef struct DisplaySoloist_ExpectedRateRange DisplaySoloist_ExpectedRateRange | Defines a struct for the expected frame rate range. |
Functions
| Name | Description |
|---|---|
| OH_DisplaySoloist * OH_DisplaySoloist_Create (bool useExclusiveThread) | Creates an OH_DisplaySoloist instance. A new OH_DisplaySoloist instance is created each time this API is called. |
| int32_t OH_DisplaySoloist_Destroy (OH_DisplaySoloist *displaySoloist) | Destroys an OH_DisplaySoloist object and reclaims the memory occupied. |
| int32_t OH_DisplaySoloist_Start (OH_DisplaySoloist *displaySoloist, OH_DisplaySoloist_FrameCallback callback, void *data) | Sets a callback function for each frame. The callback function is triggered each time a VSync signal arrives. |
| int32_t OH_DisplaySoloist_Stop (OH_DisplaySoloist *displaySoloist) | Stops requesting the next VSync signal and triggering the callback function. |
| int32_t OH_DisplaySoloist_SetExpectedFrameRateRange (OH_DisplaySoloist *displaySoloist, DisplaySoloist_ExpectedRateRange *range) | Sets the expected frame rate range. |
Type Description
DisplaySoloist_ExpectedRateRange
typedef struct DisplaySoloist_ExpectedRateRange DisplaySoloist_ExpectedRateRange
Description
Defines a struct for the expected frame rate range.
Since: 12
OH_DisplaySoloist
typedef struct OH_DisplaySoloist OH_DisplaySoloist
Description
Provides the declaration of an OH_DisplaySoloist struct.
Since: 12
OH_DisplaySoloist_FrameCallback
typedef void(* OH_DisplaySoloist_FrameCallback) (long long timestamp, long long targetTimestamp, void *data)
Description
Defines the pointer to an OH_DisplaySoloist callback function.
Since: 12
Parameters
| Name | Description |
|---|---|
| timestamp | VSync timestamp. |
| targetTimestamp | Expected VSync timestamp of the next frame. |
| data | User-defined data. |
Function Description
OH_DisplaySoloist_Create()
OH_DisplaySoloist* OH_DisplaySoloist_Create (bool useExclusiveThread)
Description
Creates an OH_DisplaySoloist instance. A new OH_DisplaySoloist instance is created each time this API is called.
Since: 12
Parameters
| Name | Description |
|---|---|
| useExclusiveThread | Whether the OH_DisplaySoloist instance exclusively occupies a thread. The value true means that the instance exclusively occupies a thread, and false means that the instance shares a thread with others. |
Returns
Returns the pointer to the OH_DisplaySoloist instance created if the operation is successful; returns a null pointer otherwise. The failure cause may be out of memory.
OH_DisplaySoloist_Destroy()
int32_t OH_DisplaySoloist_Destroy (OH_DisplaySoloist* displaySoloist)
Description
Destroys an OH_DisplaySoloist object and reclaims the memory occupied.
Since: 12
Parameters
| Name | Description |
|---|---|
| displaySoloist | Pointer to an OH_DisplaySoloist instance. |
Returns
Returns 0 if the operation is successful; returns -1 otherwise.
OH_DisplaySoloist_SetExpectedFrameRateRange()
int32_t OH_DisplaySoloist_SetExpectedFrameRateRange (OH_DisplaySoloist* displaySoloist, DisplaySoloist_ExpectedRateRange* range )
Description
Sets the expected frame rate range.
Since: 12
Parameters
| Name | Description |
|---|---|
| displaySoloist | Pointer to an OH_DisplaySoloist instance. |
| range | Pointer to the expected frame rate range, which is a DisplaySoloist_ExpectedRateRange instance. |
Returns
Returns 0 if the operation is successful; returns -1 otherwise.
OH_DisplaySoloist_Start()
int32_t OH_DisplaySoloist_Start (OH_DisplaySoloist* displaySoloist, OH_DisplaySoloist_FrameCallback callback, void* data )
Description
Sets a callback function for each frame. The callback function is triggered each time a VSync signal arrives.
Since: 12
Parameters
| Name | Description |
|---|---|
| displaySoloist | Pointer to an OH_DisplaySoloist instance. |
| callback | Callback function to be triggered when the next VSync signal arrives. |
| data | Pointer to the user-defined data struct. The type is void*. |
Returns
Returns 0 if the operation is successful; returns -1 otherwise.
OH_DisplaySoloist_Stop()
int32_t OH_DisplaySoloist_Stop (OH_DisplaySoloist* displaySoloist)
Description
Stops requesting the next VSync signal and triggering the callback function.
Since: 12
Parameters
| Name | Description |
|---|---|
| displaySoloist | Pointer to an OH_DisplaySoloist instance. |
Returns
Returns 0 if the operation is successful; returns -1 otherwise.
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