Add NtGdiAlphaBlend prototype.

svn path=/trunk/; revision=18895

reactos/include/win32k/bitmaps.h

@@ -53,6 +53,21 @@ HBITMAP FASTCALL BitmapToSurf(PBITMAPOBJ BitmapObj, HDEV GDIDevice);
 HBITMAP FASTCALL IntCreateCompatibleBitmap(PDC Dc, INT Width, INT Height);
 
 /*  User Entry Points  */
+BOOL
+STDCALL
+NtGdiAlphaBlend(
+	HDC  hDCDest,
+	INT  XOriginDest,
+	INT  YOriginDest,
+	INT  WidthDest,
+	INT  HeightDest,
+	HDC  hDCSrc,
+	INT  XOriginSrc,
+	INT  YOriginSrc,
+	INT  WidthSrc,
+	INT  HeightSrc,
+	BLENDFUNCTION  BlendFunc);
+
 BOOL
 STDCALL
 NtGdiBitBlt (