add nativeapis

Signed-off-by: Nzengyawen <zengyawen1@huawei.com>

en/application-dev/reference/native-apis/image.md

 # Image
+
+
+## Overview
+
+Provides APIs for obtaining pixel map data and information.
+
+\@Syscap SystemCapability.Multimedia.Image
+
+**Since:**
+8
+
+
+## Summary
+
+
+### Files
+
+| Name | Description | 
+| -------- | -------- |
+| [image_pixel_map_napi.h](image__pixel__map__napi_8h.md) | Declares the APIs that can lock, access, and unlock pixel map data. <br>File to Include: <multimedia/image_framework/image_pixel_map_napi.h> | 
+
+
+### Structs
+
+| Name | Description | 
+| -------- | -------- |
+| [OhosPixelMapInfo](_ohos_pixel_map_info.md) | Defines the pixel map information.  | 
+
+
+### Enums
+
+| Name | Description | 
+| -------- | -------- |
+| { OHOS_IMAGE_RESULT_SUCCESS = 0, OHOS_IMAGE_RESULT_BAD_PARAMETER = -1 } | Enumerates the error codes returned by a function.  | 
+| { OHOS_PIXEL_MAP_FORMAT_NONE = 0, OHOS_PIXEL_MAP_FORMAT_RGBA_8888 = 3, OHOS_PIXEL_MAP_FORMAT_RGB_565 = 2 } | Enumerates the pixel formats.  | 
+
+
+### Functions
+
+| Name | Description | 
+| -------- | -------- |
+| [OH_GetImageInfo](#oh_getimageinfo) (napi_env env, napi_value value, [OhosPixelMapInfo](_ohos_pixel_map_info.md) \*info) | Obtains the **PixelMap** information and stores the information to the [OhosPixelMapInfo](_ohos_pixel_map_info.md) structure.  | 
+| [OH_AccessPixels](#oh_accesspixels) (napi_env env, napi_value value, void \*\*addrPtr) | Obtains the memory address of the **PixelMap** object data and locks the memory.  | 
+| [OH_UnAccessPixels](#oh_unaccesspixels) (napi_env env, napi_value value) | Unlocks the memory of the **PixelMap** object data. This function is used with [OH_AccessPixels](#oh_accesspixels) in pairs.  | 
+
+
+## Enum Description
+
+
+### anonymous enum
+
+  
+```
+anonymous enum
+```
+**Description**<br>
+Enumerates the error codes returned by a function.
+
+| Name | Description | 
+| -------- | -------- |
+| OHOS_IMAGE_RESULT_SUCCESS  | Operation success. | 
+| OHOS_IMAGE_RESULT_BAD_PARAMETER  | Invalid value. | 
+
+
+### anonymous enum
+
+  
+```
+anonymous enum
+```
+**Description**<br>
+Enumerates the pixel formats.
+
+| Name | Description | 
+| -------- | -------- |
+| OHOS_PIXEL_MAP_FORMAT_NONE  | Unknown format. | 
+| OHOS_PIXEL_MAP_FORMAT_RGBA_8888  | 32-bit RGBA, with 8 bits each for R (red), G (green), B (blue), and A (alpha). The data is stored from the most significant bit to the least significant bit. | 
+| OHOS_PIXEL_MAP_FORMAT_RGB_565  | 16-bit RGB, with 5, 6, and 5 bits for R, G, and B, respectively. The storage sequence is from the most significant bit to the least significant bit. | 
+
+
+## Function Description
+
+
+### OH_AccessPixels()
+
+  
+```
+int32_t OH_AccessPixels (napi_env env, napi_value value, void ** addrPtr )
+```
+**Description**<br>
+Obtains the memory address of the **PixelMap** object data and locks the memory.
+
+After the function is executed successfully, **\*addrPtr** is the address of the memory to be accessed. After the access operation is complete, you must use [OH_UnAccessPixels](#oh_unaccesspixels) to unlock the memory. Otherwise, the resources in the memory cannot be released. After being unlocked, the memory address cannot be accessed or operated.
+
+ **Parameters**
+
+| Name | Description | 
+| -------- | -------- |
+| env | Indicates the NAPI environment pointer.  | 
+| value | Indicates the **PixelMap** object at the application layer.  | 
+| addrPtr | Indicates the double pointer to the memory address.  | 
+
+ **See**
+
+UnAccessPixels
+
+**Returns**
+
+Returns OHOS_IMAGE_RESULT_SUCCESS if the operation is successful; returns an error code otherwise.
+
+
+### OH_GetImageInfo()
+
+  
+```
+int32_t OH_GetImageInfo (napi_env env, napi_value value, OhosPixelMapInfo * info )
+```
+**Description**<br>
+Obtains the **PixelMap** information and stores the information to the [OhosPixelMapInfo](_ohos_pixel_map_info.md) structure.
+
+ **Parameters**
+
+| Name | Description | 
+| -------- | -------- |
+| env | Indicates the NAPI environment pointer.  | 
+| value | Indicates the **PixelMap** object at the application layer.  | 
+| info | Indicates the pointer to the object that stores the information obtained. For details, see [OhosPixelMapInfo](_ohos_pixel_map_info.md).  | 
+
+**Returns**
+
+Returns **0** if the information is obtained and stored successfully; returns an error code otherwise.
+
+ **See**
+
+[OhosPixelMapInfo](_ohos_pixel_map_info.md)
+
+
+### OH_UnAccessPixels()
+
+  
+```
+int32_t OH_UnAccessPixels (napi_env env, napi_value value )
+```
+**Description**<br>
+Unlocks the memory of the **PixelMap** object data. This function is used with [OH_AccessPixels](#oh_accesspixels) in pairs.
+
+ **Parameters**
+
+| Name | Description | 
+| -------- | -------- |
+| env | Indicates the NAPI environment pointer.  | 
+| value | Indicates the **PixelMap** object at the application layer.  | 
+
+**Returns**
+
+Returns OHOS_IMAGE_RESULT_SUCCESS if the operation is successful; returns an error code otherwise.
+
+ **See**
+
+AccessPixels