The source buffer must remain valid and unchanged until completion (flush()/endTransaction()/next synchronous operation), same contract as DisplayDevi

Fa = αb; Fb = 0 co = αs x Cs x αb αo = αs x αb

Fa = 1 – αb; Fb = 0 co = αs x Cs x (1 – αb) αo = αs x (1 – αb)

This is actually self-conflicting, but included for completeness.

This is actually self-conflicting, but included for completeness.

Blending mode used for this input.