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GetROP2()
Get the current drawing mode
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Syntax
GetROP2( <hDC> )   -->   nMode

Arguments
<hDC> specifies the device context.

Returns
The returned value is an integer representing the current
drawing mode (one of the values below).

Description
This function returns the current drawing mode, which
determines what GDI does with the existing background
colour(s) when outputting pixels, e.g. when filling the
interior of an object, or using a pen.

(ROP is short for raster operation; you are unlikely to be
drawing on anything that does not support raster ops.)

Most programs will never use the GetROP2() or SetROP2()
functions, but some interesting/useful special effects are
possible.

The mode values, and their effects on the existing pixel(s)
are:

Mode                means

R2_BLACK            draw using black (ignoring the pen colour)

R2_COPYPEN          use the pen colour

R2_MASKNOTPEN       use colour common to inverse of pen colour and
                    existing pixels

R2_MASKPEN          use colour common to pen and existing pixels

R2_MASKPENNOT       use colour common to pen and inverse of existing
                    pixels

R2_MERGENOTPEN      use bitwise OR of inverse of pen colour with
                    existing pixels

R2_MERGEPEN         use bitwise OR of pen with existing pixels

R2_MERGEPENNOT      use bitwise OR of pen with inverse of existing pixels

R2_NOP              no operation (pixels are unchanged)

R2_NOT              inverse of existing pixel colours

R2_NOTCOPYPEN       inverse of pen colour

R2_NOTMASKPEN       inverse of (colour common to pen and existing pixels)

R2_NOTMERGEPEN      inverse of (bitwise OR of pen colour with existing
                    pixels)

R2_NOTXORPEN        inverse of (bitwise XOR of pen with existing pixels)

R2_WHITE            draw using white (ignoring pen colour)

R2_XORPEN           use bitwise XOR of pen with existing pixels

Example
nCurrentROP = GetROP2( hDC )