Device context information and manipulation
The following functions provide the API routines that are used to change
the attributes of the currently active device context, such as the
current foreground and background colors, and the current pen pattern.
These routines also provide information about device contexts, such as
the resolution, pixel depth, aspect ratio etc.
Note that some of these functions are bound to a specific device context,
and if this device context is not the currently active context, the
active context will not be affected.
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