ContextFormat constructor Null safety

1. face_sdk
2. face_sdk
3. ContextFormat
4. ContextFormat const constructor

ContextFormat enum

1. Constructors
2. ContextFormat
3. Values
4. FORMAT_BGR
5. FORMAT_RGB
6. FORMAT_BGRA8888
7. FORMAT_YUV420
8. FORMAT_YUV_NV12
9. FORMAT_NV21
10. Properties
11. hashCode
12. index
13. runtimeType
14. Methods
15. noSuchMethod
16. toString
17. Operators
18. operator ==
19. Constants
20. values