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2.2.1.2.1 BackMode

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The BackMode enumeration describes the background color that is used to fill a specific region on a drawing surface.

 typedef  enum
 {
   TRANSPARENT = 0x00000001,
   OPAQUE = 0x00000002
 } BackMode;

TRANSPARENT:  The region is filled with the background color before drawing is performed.

OPAQUE:  The region is not filled with the background color before drawing is done.