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Bitmap Rotation
Windows provides a function to copy a bitmap into a parallelogram; this
function, PlgBlt, performs a bit-block transfer from a rectangle in a source device context
into a parallelogram in a destination device context. In order to rotate the
bitmap, an application must provide the coordinates, in world units, to be used for
the corners of the parallelogram. (For more information about rotation and
world units, see Coordinate Spaces and Transformations.)
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Win32 Multimedia Programmer's Reference (mmedia.hlp)
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