2.1.1.20 MixMode Enumeration
The MixMode Enumeration specifies the background mix mode for text, hatched brushes, and other nonsolid pen styles.
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typedef enum { TRANSPARENT = 0x0001, OPAQUE = 0x0002 } MixMode;
TRANSPARENT: The background remains untouched.
OPAQUE: The background is filled with the background color that is currently defined in the playback device context before the text, hatched brush, or pen is drawn.