harmony 鸿蒙OH_NativeBuffer

  • 2022-10-28
  • 浏览 (843)

OH_NativeBuffer

概述

提供NativeBuffer功能,通过提供的接口,可以实现共享内存的申请、使用、属性查询、释放等操作。

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

起始版本:

9

汇总

文件

名称 描述
native_buffer.h 定义获取和使用NativeBuffer的相关函数。
引用文件: <native_buffer/native_buffer.h>
库: libnative_buffer.so

结构体

名称 描述
OH_NativeBuffer_Config OH_NativeBuffer的属性配置,用于申请新的OH_NativeBuffer实例或查询现有实例的相关属性。

类型定义

名称 描述
OH_NativeBuffer 提供OH_NativeBuffer结构体声明。

枚举

名称 描述
OH_NativeBuffer_Usage { NATIVEBUFFER_USAGE_CPU_READ = (1ULL << 0), NATIVEBUFFER_USAGE_CPU_WRITE = (1ULL << 1), NATIVEBUFFER_USAGE_MEM_DMA = (1ULL << 3) } OH_NativeBuffer的用途。
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
}
OH_NativeBuffer的格式。

函数

名称 描述
OH_NativeBuffer_Alloc (const OH_NativeBuffer_Config *config) 通过OH_NativeBuffer_Config创建OH_NativeBuffer实例,每次调用都会产生一个新的OH_NativeBuffer实例。
OH_NativeBuffer_Reference (OH_NativeBuffer *buffer) 将OH_NativeBuffer对象的引用计数加1。
OH_NativeBuffer_Unreference (OH_NativeBuffer *buffer) 将OH_NativeBuffer对象的引用计数减1,当引用计数为0的时候,该NativeBuffer对象会被析构掉。
OH_NativeBuffer_GetConfig (OH_NativeBuffer *buffer, OH_NativeBuffer_Config *config) 用于获取OH_NativeBuffer的属性。
OH_NativeBuffer_Map (OH_NativeBuffer *buffer, void **virAddr) 将OH_NativeBuffer对应的ION内存映射到进程空间。
OH_NativeBuffer_Unmap (OH_NativeBuffer *buffer) 将OH_NativeBuffer对应的ION内存从进程空间移除。
OH_NativeBuffer_GetSeqNum (OH_NativeBuffer *buffer) 获取OH_NativeBuffer的序列号。

类型定义说明

OH_NativeBuffer

typedef struct OH_NativeBuffer OH_NativeBuffer

描述:

提供OH_NativeBuffer结构体声明。

枚举类型说明

OH_NativeBuffer_Format

enum OH_NativeBuffer_Format

描述:

OH_NativeBuffer的格式。

\@SysCap SystemCapability.Graphic.Graphic2D.NativeBuffer

枚举值 描述
NATIVEBUFFER_PIXEL_FMT_RGB_565 RGB565格式
NATIVEBUFFER_PIXEL_FMT_RGBA_5658 RGBA5658格式
NATIVEBUFFER_PIXEL_FMT_RGBX_4444 RGBX4444格式
NATIVEBUFFER_PIXEL_FMT_RGBA_4444 RGBA4444格式
NATIVEBUFFER_PIXEL_FMT_RGB_444 RGB444格式
NATIVEBUFFER_PIXEL_FMT_RGBX_5551 RGBX5551格式
NATIVEBUFFER_PIXEL_FMT_RGBA_5551 RGBA5551格式
NATIVEBUFFER_PIXEL_FMT_RGB_555 RGB555格式
NATIVEBUFFER_PIXEL_FMT_RGBX_8888 RGBX8888格式
NATIVEBUFFER_PIXEL_FMT_RGBA_8888 RGBA8888格式
NATIVEBUFFER_PIXEL_FMT_RGB_888 RGB888格式
NATIVEBUFFER_PIXEL_FMT_BGR_565 BGR565格式
NATIVEBUFFER_PIXEL_FMT_BGRX_4444 BGRX4444格式
NATIVEBUFFER_PIXEL_FMT_BGRA_4444 BGRA4444格式
NATIVEBUFFER_PIXEL_FMT_BGRX_5551 BGRX5551格式
NATIVEBUFFER_PIXEL_FMT_BGRA_5551 BGRA5551格式
NATIVEBUFFER_PIXEL_FMT_BGRX_8888 BGRX8888格式
NATIVEBUFFER_PIXEL_FMT_BGRA_8888 BGRA8888格式
NATIVEBUFFER_PIXEL_FMT_BUTT 无效格式

起始版本:

10

OH_NativeBuffer_Usage

enum OH_NativeBuffer_Usage

描述:

OH_NativeBuffer的用途。

\@SysCap SystemCapability.Graphic.Graphic2D.NativeBuffer

枚举值 描述
NATIVEBUFFER_USAGE_CPU_READ CPU可读
NATIVEBUFFER_USAGE_CPU_WRITE CPU可写
NATIVEBUFFER_USAGE_MEM_DMA 直接内存访问缓冲区

起始版本:

10

函数说明

OH_NativeBuffer_Alloc()

OH_NativeBuffer* OH_NativeBuffer_Alloc (const OH_NativeBuffer_Config * config)

描述:

通过OH_NativeBuffer_Config创建OH_NativeBuffer实例,每次调用都会产生一个新的OH_NativeBuffer实例。

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

参数:

名称 描述
config 一个指向OH_NativeBuffer_Config类型的指针。

返回:

创建成功则返回一个指向OH_NativeBuffer结构体实例的指针,否则返回NULL。

OH_NativeBuffer_GetConfig()

void OH_NativeBuffer_GetConfig (OH_NativeBuffer * buffer, OH_NativeBuffer_Config * config )

描述:

用于获取OH_NativeBuffer的属性。

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

参数:

名称 描述
buffer 一个指向OH_NativeBuffer实例的指针。
config 一个指向OH_NativeBuffer_Config的指针,用于接收OH_NativeBuffer的属性。

OH_NativeBuffer_GetSeqNum()

uint32_t OH_NativeBuffer_GetSeqNum (OH_NativeBuffer * buffer)

描述:

获取OH_NativeBuffer的序列号。

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

参数:

名称 描述
buffer 一个指向OH_NativeBuffer实例的指针。

返回:

返回对应OH_NativeBuffer的唯一序列号。

OH_NativeBuffer_Map()

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

描述:

将OH_NativeBuffer对应的ION内存映射到进程空间。

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

参数:

名称 描述
buffer 一个指向OH_NativeBuffer实例的指针。
virAddr 一个二级指针,二级指针指向映射到当前进程的虚拟内存的地址。

返回:

返回值为0表示执行成功。

OH_NativeBuffer_Reference()

int32_t OH_NativeBuffer_Reference (OH_NativeBuffer * buffer)

描述:

将OH_NativeBuffer对象的引用计数加1。

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

参数:

名称 描述
buffer 一个指向OH_NativeBuffer实例的指针。

返回:

返回值为0表示执行成功。

OH_NativeBuffer_Unmap()

int32_t OH_NativeBuffer_Unmap (OH_NativeBuffer * buffer)

描述:

将OH_NativeBuffer对应的ION内存从进程空间移除。

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

参数:

名称 描述
buffer 一个指向OH_NativeBuffer实例的指针。

返回:

返回值为0表示执行成功。

OH_NativeBuffer_Unreference()

int32_t OH_NativeBuffer_Unreference (OH_NativeBuffer * buffer)

描述:

将OH_NativeBuffer对象的引用计数减1,当引用计数为0的时候,该NativeBuffer对象会被析构掉。

\@syscap SystemCapability.Graphic.Graphic2D.OH_NativeBuffer

参数:

名称 描述
buffer 一个指向OH_NativeBuffer实例的指针。

返回:

返回值为0表示执行成功。

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