What is the principle of transparent window?

CodePudding user response:

Early on the GDI implementation is to use an empty background brush drawing window (GetStockObject (NULL_BRUSH)), then had the AlphaBlend function

CodePudding user response:

reference 1/f, play big shoot early nuclear response:

early implementation is to use an empty on GDI brush drawing window background (GetStockObject (NULL_BRUSH)), then the AlphaBlend function

Source bitmap and target bitmap is what relation? The meaning of the layered window? Is there a relationship between them?