C# Signature:

[DllImport("gdi32.dll")]
static extern bool StretchBlt(IntPtr hdcDest, int nXOriginDest,
   int nYOriginDest, int nWidthDest, int nHeightDest, IntPtr hdcSrc,
   int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc, uint dwRop);

The last argument uint dwRop from the signature above specifies a raster operation code defined in the header. A value from enum TernaryRasterOperations below can be used as the last argument to fake the defined value from this signature:

[DllImport("gdi32.dll")]
static extern bool StretchBlt(IntPtr hdcDest, int nXOriginDest,
   int nYOriginDest, int nWidthDest, int nHeightDest, IntPtr hdcSrc,
   int nXOriginSrc, int nYOriginSrc, int nWidthSrc, int nHeightSrc,  TernaryRasterOperations dwRop );

User-Defined Types:

public enum TernaryRasterOperations
{
    SRCCOPY     = 0x00CC0020, /* dest = source*/
    SRCPAINT    = 0x00EE0086, /* dest = source OR dest*/
    SRCAND      = 0x008800C6, /* dest = source AND dest*/
    SRCINVERT   = 0x00660046, /* dest = source XOR dest*/
    SRCERASE    = 0x00440328, /* dest = source AND (NOT dest )*/
    NOTSRCCOPY  = 0x00330008, /* dest = (NOT source)*/
    NOTSRCERASE = 0x001100A6, /* dest = (NOT src) AND (NOT dest) */
    MERGECOPY   = 0x00C000CA, /* dest = (source AND pattern)*/
    MERGEPAINT  = 0x00BB0226, /* dest = (NOT source) OR dest*/
    PATCOPY     = 0x00F00021, /* dest = pattern*/
    PATPAINT    = 0x00FB0A09, /* dest = DPSnoo*/
    PATINVERT   = 0x005A0049, /* dest = pattern XOR dest*/
    DSTINVERT   = 0x00550009, /* dest = (NOT dest)*/
    BLACKNESS   = 0x00000042, /* dest = BLACK*/
    WHITENESS   = 0x00FF0062, /* dest = WHITE*/
};

Notes:

StretchBlt can be used to create zoom functionality.

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