harmony 鸿蒙OH_NativeBuffer

  • 2023-10-30
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OH_NativeBuffer

Overview

The OH_NativeBuffer module provides the capabilities of NativeBuffer. Using the functions provided by this module, you can apply for, use, and release the shared memory, and query its attributes.

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

Since

9

Summary

Files

Name Description
native_buffer.h Declares the functions for obtaining and using NativeBuffer.
File to include: <native_buffer/native_buffer.h>
Library: libnative_buffer.so

Structs

Name Description
OH_NativeBuffer_Config Defines the OH_NativeBuffer attribute configuration, which is used when you apply for a new OH_NativeBuffer instance or query the attributes of an existing instance.

Types

Name Description
OH_NativeBuffer Provides the declaration of an OH_NativeBuffer struct.

Enums

Name Description
OH_NativeBuffer_Usage { NATIVEBUFFER_USAGE_CPU_READ = (1ULL << 0), NATIVEBUFFER_USAGE_CPU_WRITE = (1ULL << 1), NATIVEBUFFER_USAGE_MEM_DMA = (1ULL << 3) } Enumerates the OH_NativeBuffer usages.
OH_NativeBuffer_Format {
NATIVEBUFFER_PIXEL_FMT_RGB_565 = 3, NATIVEBUFFER_PIXEL_FMT_RGBA_5658, NATIVEBUFFER_PIXEL_FMT_RGBX_4444, NATIVEBUFFER_PIXEL_FMT_RGBA_4444,
NATIVEBUFFER_PIXEL_FMT_RGB_444, NATIVEBUFFER_PIXEL_FMT_RGBX_5551, NATIVEBUFFER_PIXEL_FMT_RGBA_5551, NATIVEBUFFER_PIXEL_FMT_RGB_555,
NATIVEBUFFER_PIXEL_FMT_RGBX_8888, NATIVEBUFFER_PIXEL_FMT_RGBA_8888, NATIVEBUFFER_PIXEL_FMT_RGB_888, NATIVEBUFFER_PIXEL_FMT_BGR_565,
NATIVEBUFFER_PIXEL_FMT_BGRX_4444, NATIVEBUFFER_PIXEL_FMT_BGRA_4444, NATIVEBUFFER_PIXEL_FMT_BGRX_5551, NATIVEBUFFER_PIXEL_FMT_BGRA_5551,
NATIVEBUFFER_PIXEL_FMT_BGRX_8888, NATIVEBUFFER_PIXEL_FMT_BGRA_8888, NATIVEBUFFER_PIXEL_FMT_BUTT = 0X7FFFFFFF
}		 Enumerates the OH_NativeBuffer formats.

Functions

Name Description
OH_NativeBuffer_Alloc (const OH_NativeBuffer_Config *config) Creates an OH_NativeBuffer instance based on an OH_NativeBuffer_Config struct. A new OH_NativeBuffer instance is created each time this function is called.
OH_NativeBuffer_Reference (OH_NativeBuffer *buffer) Increases the reference count of an OH_NativeBuffer instance by 1.
OH_NativeBuffer_Unreference (OH_NativeBuffer *buffer) Decreases the reference count of an OH_NativeBuffer instance by 1 and, when the reference count reaches 0, destroys the instance.
OH_NativeBuffer_GetConfig (OH_NativeBuffer *buffer, OH_NativeBuffer_Config *config) Obtains the attributes of an OH_NativeBuffer instance.
OH_NativeBuffer_Map (OH_NativeBuffer *buffer, void **virAddr) Maps the ION memory corresponding to an OH_NativeBuffer instance to the process address space.
OH_NativeBuffer_Unmap (OH_NativeBuffer *buffer) Unmaps the ION memory corresponding to an OH_NativeBuffer instance from the process address space.
OH_NativeBuffer_GetSeqNum (OH_NativeBuffer *buffer) Obtains the sequence number of an OH_NativeBuffer instance.

Type Description

OH_NativeBuffer

typedef struct OH_NativeBuffer OH_NativeBuffer

Description

Provides the declaration of an OH_NativeBuffer struct.

Enum Description

OH_NativeBuffer_Format

enum OH_NativeBuffer_Format

Description

Enumerates the OH_NativeBuffer formats.

\@SysCap SystemCapability.Graphic.Graphic2D.NativeBuffer

Value Description
NATIVEBUFFER_PIXEL_FMT_RGB_565 RGB565.
NATIVEBUFFER_PIXEL_FMT_RGBA_5658 RGBA5658.
NATIVEBUFFER_PIXEL_FMT_RGBX_4444 RGBX4444.
NATIVEBUFFER_PIXEL_FMT_RGBA_4444 RGBA4444.
NATIVEBUFFER_PIXEL_FMT_RGB_444 RGB444.
NATIVEBUFFER_PIXEL_FMT_RGBX_5551 RGBX5551.
NATIVEBUFFER_PIXEL_FMT_RGBA_5551 RGBA5551.
NATIVEBUFFER_PIXEL_FMT_RGB_555 RGB555.
NATIVEBUFFER_PIXEL_FMT_RGBX_8888 RGBX8888.
NATIVEBUFFER_PIXEL_FMT_RGBA_8888 RGBA8888.
NATIVEBUFFER_PIXEL_FMT_RGB_888 RGB888.
NATIVEBUFFER_PIXEL_FMT_BGR_565 BGR565.
NATIVEBUFFER_PIXEL_FMT_BGRX_4444 BGRX4444.
NATIVEBUFFER_PIXEL_FMT_BGRA_4444 BGRA4444.
NATIVEBUFFER_PIXEL_FMT_BGRX_5551 BGRX5551.
NATIVEBUFFER_PIXEL_FMT_BGRA_5551 BGRA5551.
NATIVEBUFFER_PIXEL_FMT_BGRX_8888 BGRX8888.
NATIVEBUFFER_PIXEL_FMT_BGRA_8888 BGRA8888.
NATIVEBUFFER_PIXEL_FMT_BUTT Invalid format.

Since

10

OH_NativeBuffer_Usage

enum OH_NativeBuffer_Usage

Description

Enumerates the OH_NativeBuffer usages.

\@SysCap SystemCapability.Graphic.Graphic2D.NativeBuffer

Value Description
NATIVEBUFFER_USAGE_CPU_READ Read by the CPU.
NATIVEBUFFER_USAGE_CPU_WRITE Write by the CPU.
NATIVEBUFFER_USAGE_MEM_DMA Direct memory access to the buffer.

Since

10

Function Description

OH_NativeBuffer_Alloc()

OH_NativeBuffer* OH_NativeBuffer_Alloc (const OH_NativeBuffer_Config * config)

Description

Creates an OH_NativeBuffer instance based on an OH_NativeBuffer_Config struct. A new OH_NativeBuffer instance is created each time this function is called.

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

Parameters

Name Description
config Pointer to an OH_NativeBuffer_Config instance.

Returns

Returns the pointer to the OH_NativeBuffer instance created if the operation is successful; returns NULL otherwise.

OH_NativeBuffer_GetConfig()

void OH_NativeBuffer_GetConfig (OH_NativeBuffer * buffer, OH_NativeBuffer_Config * config )

Description

Obtains the attributes of an OH_NativeBuffer instance.

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

Parameters

Name Description
buffer Pointer to an OH_NativeBuffer instance.
config Pointer to an OH_NativeBuffer_Config instance, which is used to receive the attributes of OH_NativeBuffer.

OH_NativeBuffer_GetSeqNum()

uint32_t OH_NativeBuffer_GetSeqNum (OH_NativeBuffer * buffer)

Description

Obtains the sequence number of an OH_NativeBuffer instance.

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

Parameters

Name Description
buffer Pointer to an OH_NativeBuffer instance.

Returns

Returns the unique sequence number of the OH_NativeBuffer instance.

OH_NativeBuffer_Map()

int32_t OH_NativeBuffer_Map (OH_NativeBuffer * buffer, void ** virAddr )

Description

Maps the ION memory corresponding to an OH_NativeBuffer instance to the process address space.

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

Parameters

Name Description
buffer Pointer to an OH_NativeBuffer instance.
virAddr Double pointer to the address of the virtual memory.

Returns

Returns 0 if the operation is successful.

OH_NativeBuffer_Reference()

int32_t OH_NativeBuffer_Reference (OH_NativeBuffer * buffer)

Description

Increases the reference count of an OH_NativeBuffer instance by 1.

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

Parameters

Name Description
buffer Pointer to an OH_NativeBuffer instance.

Returns

Returns 0 if the operation is successful.

OH_NativeBuffer_Unmap()

int32_t OH_NativeBuffer_Unmap (OH_NativeBuffer * buffer)

Description

Unmaps the ION memory corresponding to an OH_NativeBuffer instance from the process address space.

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

Parameters

Name Description
buffer Pointer to an OH_NativeBuffer instance.

Returns

Returns 0 if the operation is successful.

OH_NativeBuffer_Unreference()

int32_t OH_NativeBuffer_Unreference (OH_NativeBuffer * buffer)

Description

Decreases the reference count of an OH_NativeBuffer instance by 1 and, when the reference count reaches 0, destroys the instance.

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

Parameters

Name Description
buffer Pointer to an OH_NativeBuffer instance.

Returns

Returns 0 if the operation is successful.

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