Graphic Modes

Windows supports five graphic modes that allow an application to specify how colors are mixed, where output appears, how the output is scaled, and so on. These modes, which are stored in a device context, are described in the following table.

Mode	Description
Background mode	Defines how background colors are mixed with existing window or screen colors for bitmap and text operations.
Drawing mode	Defines how foreground colors are mixed with existing window or screen colors for pen, brush, bitmap, and text operations.
Mapping mode	Defines how graphics output is mapped from logical (or world) space onto the window, screen, or printer paper.
Polygon-fill mode	Defines how the brush pattern is used to fill the interior of complex regions.
Stretching mode	Defines how bitmap colors are mixed with existing window or screen colors when the bitmap is compressed (or scaled down).

As it does with graphic objects, Windows initializes a device context with default graphic modes. An application can retrieve and examine these default modes by calling the following functions.

Graphic mode	Function
Background mode	GetBkMode
Drawing mode	GetROP2
Mapping mode	GetMapMode
Polygon-fill mode	GetPolyFillMode
Stretching mode	GetStretchBltMode

An application can change the default modes by calling one of the following functions.

Graphic mode	Function
Background mode	SetBkMode
Drawing mode	SetROP2
Mapping mode	SetMapMode
Polygon-fill mode	SetPolyFillMode
Stretching mode	SetStretchBltMode

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