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StretchBlt (gdi32)
 
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Summary
The StretchBlt function copies a bitmap from a source rectangle into a destination rectangle, stretching or compressing the bitmap to fit the dimensions of the destination rectangle, if necessary. The system stretches or compresses the bitmap according to the stretching mode currently set in the destination device context.

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);

User-Defined Types:

None.

Notes:

StretchBlt can be used to create zoom functionality.

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Sample Code:

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Alternative Managed API:

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Documentation
StretchBlt on MSDN

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