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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