2 operator add function
3 operator add function with separate destination.
3 operator add function with masking
3 operator add function with separate destination and masking.
2 operator add function with master alpha value. UseAlpha determines whether the src's alpha channel will be used or not.
3 operator add function with separate destination and master alpha value.
3 operator add function with masking and master alpha value.
3 operator add function with separate destination, masking, and master value.