harmony 鸿蒙NativeVsync
NativeVsync
Overview
The NativeVsync module provides the capabilities of native virtual synchronization (VSync).
\@syscap SystemCapability.Graphic.Graphic2D.NativeVsync
Since
9
Summary
Files
Name | Description |
---|---|
native_vsync.h | Declares the functions for obtaining and using native VSync. File to include: <native_vsync/native_vsync.h> Library: libnative_vsync.so |
Types
Name | Description |
---|---|
OH_NativeVSync | Provides the declaration of an OH_NativeVSync struct. |
(*OH_NativeVSync_FrameCallback) (long long timestamp, void *data) | Defines the pointer to a VSync callback function. |
Functions
Name | Description |
---|---|
OH_NativeVSync_Create (const char *name, unsigned int length) | Creates an OH_NativeVSync instance. A new OH_NativeVSync instance is created each time this function is called. |
OH_NativeVSync_Destroy (OH_NativeVSync *nativeVsync) | Destroys an OH_NativeVSync instance. |
OH_NativeVSync_RequestFrame (OH_NativeVSync *nativeVsync, OH_NativeVSync_FrameCallback callback, void *data) | Requests the next VSync signal. When the signal arrives, a callback function is invoked. |
OH_NativeVSync_GetPeriod (OH_NativeVSync *nativeVsync, long long *period) | Obtains the VSync period. |
Type Description
OH_NativeVSync
typedef struct OH_NativeVSync OH_NativeVSync
Description
Provides the declaration of an OH_NativeVSync struct.
OH_NativeVSync_FrameCallback
typedef void(* OH_NativeVSync_FrameCallback) (long long timestamp, void *data)
Description
Defines the pointer to a VSync callback function.
\@syscap SystemCapability.Graphic.Graphic2D.NativeVsync
Parameters
Name | Description |
---|---|
timestamp | VSync timestamp. |
data | User-defined data. |
Function Description
OH_NativeVSync_GetPeriod()
int OH_NativeVSync_GetPeriod (OH_NativeVSync * nativeVsync, long long * period )
Description
Obtains the VSync period.
\@syscap SystemCapability.Graphic.Graphic2D.NativeVsync
Parameters
Name | Description |
---|---|
nativeVsync | Pointer to an OH_NativeVSync instance. |
period | Pointer to the VSync period. |
Returns
Returns 0 if the operation is successful.
Since
10
OH_NativeVSync_Create()
OH_NativeVSync* OH_NativeVSync_Create (const char * name, unsigned int length )
Description
Creates an OH_NativeVSync instance. A new OH_NativeVSync instance is created each time this function is called.
\@syscap SystemCapability.Graphic.Graphic2D.NativeVsync
Parameters
Name | Description |
---|---|
name | Pointer to the name that associates with an OH_NativeVSync instance. |
length | Length of the name. |
Returns
Returns the pointer to an OH_NativeVSync instance.
OH_NativeVSync_Destroy()
void OH_NativeVSync_Destroy (OH_NativeVSync * nativeVsync)
Description
Destroys an OH_NativeVSync instance.
\@syscap SystemCapability.Graphic.Graphic2D.NativeVsync
Parameters
Name | Description |
---|---|
nativeVsync | Pointer to an OH_NativeVSync instance. |
OH_NativeVSync_RequestFrame()
int OH_NativeVSync_RequestFrame (OH_NativeVSync * nativeVsync, OH_NativeVSync_FrameCallback callback, void * data )
Description
Requests the next VSync signal. When the signal arrives, a callback function is invoked.
\@syscap SystemCapability.Graphic.Graphic2D.NativeVsync
Parameters
Name | Description |
---|---|
nativeVsync | Pointer to an OH_NativeVSync instance. |
callback | Function pointer of the OH_NativeVSync_FrameCallback type. This function pointer will be called 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.
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