add nativeapis

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

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

+# OH_Drawing_BitmapFormat
+
+
+## Overview
+
+Defines the pixel format of a bitmap, including the color type and alpha type.
+
+**Since:**
+8
+
+**Related Modules:**
+
+[Drawing](_drawing.md)
+
+
+## Summary
+
+
+### Member Variables
+
+| Name | Description | 
+| -------- | -------- |
+| [colorFormat](#colorformat) | Storage format of bitmap pixels  | 
+| [alphaFormat](#alphaformat) | Alpha format of bitmap pixels  | 
+
+
+## Member Variable Description 
+
+
+### alphaFormat
+
+  
+```
+OH_Drawing_AlphaFormat OH_Drawing_BitmapFormat::alphaFormat
+```
+**Description**<br>
+Alpha format of bitmap pixels
+
+
+### colorFormat
+
+  
+```
+OH_Drawing_ColorFormat OH_Drawing_BitmapFormat::colorFormat
+```
+**Description**<br>
+Storage format of bitmap pixels