AlphaBlend

function AlphaBlend(

  hdcDest: HDC;

  nXOriginDest: Integer;

  nYOriginDest: Integer;

  nWidthDest: Integer;

  nHeightDest: Integer;

  hdcSrc: HDC;

  nXOriginSrc: Integer;

  nYOriginSrc: Integer;

  nWidthSrc: Integer;

  nHeightSrc: Integer;

  blendFunction: BLENDFUNCTION

):BOOL;