diff --git a/reactos/subsys/win32k/objects/bitmaps.c b/reactos/subsys/win32k/objects/bitmaps.c
index af3497b146c..0871bc9d4d9 100644
--- a/reactos/subsys/win32k/objects/bitmaps.c
+++ b/reactos/subsys/win32k/objects/bitmaps.c
@@ -16,7 +16,7 @@
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-/* $Id: bitmaps.c,v 1.44 2003/10/29 16:25:00 navaraf Exp $ */
+/* $Id: bitmaps.c,v 1.45 2003/11/08 02:16:31 sedwards Exp $ */
 #undef WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <stdlib.h>
@@ -427,20 +427,212 @@ COLORREF STDCALL NtGdiGetPixel(HDC  hDC,
   return cr;
 }
 
-BOOL STDCALL NtGdiMaskBlt(HDC  hDCDest,
-                  INT  XDest,
-                  INT  YDest,
-                  INT  Width,
-                  INT  Height,
-                  HDC  hDCSrc,
-                  INT  XSrc,
-                  INT  YSrc,
-                  HBITMAP  hMaskBitmap,
-                  INT  xMask,
-                  INT  yMask,
-                  DWORD  ROP)
+/***********************************************************************
+ * MaskBlt
+ * Ported from WINE by sedwards 11-4-03
+ * 
+ * Someone thought it would be faster to do it here and then switch back 
+ * to GDI32. I dunno. Write a test and let me know. 
+ */
+
+static inline BYTE SwapROP3_SrcDst(BYTE bRop3)
 {
-  UNIMPLEMENTED;
+    return (bRop3 & 0x99) | ((bRop3 & 0x22) << 1) | ((bRop3 & 0x44) >> 1);
+}
+
+#define FRGND_ROP3(ROP4)	((ROP4) & 0x00FFFFFF)
+#define BKGND_ROP3(ROP4)	(ROP3Table[(SwapROP3_SrcDst((ROP4)>>24)) & 0xFF])
+#define DSTCOPY 		0x00AA0029
+#define DSTERASE		0x00220326 /* dest = dest & (~src) : DSna */
+
+BOOL STDCALL NtGdiMaskBlt(HDC hdcDest, INT nXDest, INT nYDest,
+                        INT nWidth, INT nHeight, HDC hdcSrc,
+			INT nXSrc, INT nYSrc, HBITMAP hbmMask,
+			INT xMask, INT yMask, DWORD dwRop)
+{
+    HBITMAP hOldMaskBitmap, hBitmap2, hOldBitmap2, hBitmap3, hOldBitmap3;
+    HDC hDCMask, hDC1, hDC2;
+    static const DWORD ROP3Table[256] = 
+    {
+        0x00000042, 0x00010289,
+        0x00020C89, 0x000300AA,
+        0x00040C88, 0x000500A9,
+        0x00060865, 0x000702C5,
+        0x00080F08, 0x00090245,
+        0x000A0329, 0x000B0B2A,
+        0x000C0324, 0x000D0B25,
+        0x000E08A5, 0x000F0001,
+        0x00100C85, 0x001100A6,
+        0x00120868, 0x001302C8,
+        0x00140869, 0x001502C9,
+        0x00165CCA, 0x00171D54,
+        0x00180D59, 0x00191CC8,
+        0x001A06C5, 0x001B0768,
+        0x001C06CA, 0x001D0766,
+        0x001E01A5, 0x001F0385,
+        0x00200F09, 0x00210248,
+        0x00220326, 0x00230B24,
+        0x00240D55, 0x00251CC5,
+        0x002606C8, 0x00271868,
+        0x00280369, 0x002916CA,
+        0x002A0CC9, 0x002B1D58,
+        0x002C0784, 0x002D060A,
+        0x002E064A, 0x002F0E2A,
+        0x0030032A, 0x00310B28,
+        0x00320688, 0x00330008,
+        0x003406C4, 0x00351864,
+        0x003601A8, 0x00370388,
+        0x0038078A, 0x00390604,
+        0x003A0644, 0x003B0E24,
+        0x003C004A, 0x003D18A4,
+        0x003E1B24, 0x003F00EA,
+        0x00400F0A, 0x00410249,
+        0x00420D5D, 0x00431CC4,
+        0x00440328, 0x00450B29,
+        0x004606C6, 0x0047076A,
+        0x00480368, 0x004916C5,
+        0x004A0789, 0x004B0605,
+        0x004C0CC8, 0x004D1954,
+        0x004E0645, 0x004F0E25,
+        0x00500325, 0x00510B26,
+        0x005206C9, 0x00530764,
+        0x005408A9, 0x00550009,
+        0x005601A9, 0x00570389,
+        0x00580785, 0x00590609,
+        0x005A0049, 0x005B18A9,
+        0x005C0649, 0x005D0E29,
+        0x005E1B29, 0x005F00E9,
+        0x00600365, 0x006116C6,
+        0x00620786, 0x00630608,
+        0x00640788, 0x00650606,
+        0x00660046, 0x006718A8,
+        0x006858A6, 0x00690145,
+        0x006A01E9, 0x006B178A,
+        0x006C01E8, 0x006D1785,
+        0x006E1E28, 0x006F0C65,
+        0x00700CC5, 0x00711D5C,
+        0x00720648, 0x00730E28,
+        0x00740646, 0x00750E26,
+        0x00761B28, 0x007700E6,
+        0x007801E5, 0x00791786,
+        0x007A1E29, 0x007B0C68,
+        0x007C1E24, 0x007D0C69,
+        0x007E0955, 0x007F03C9,
+        0x008003E9, 0x00810975,
+        0x00820C49, 0x00831E04,
+        0x00840C48, 0x00851E05,
+        0x008617A6, 0x008701C5,
+        0x008800C6, 0x00891B08,
+        0x008A0E06, 0x008B0666,
+        0x008C0E08, 0x008D0668,
+        0x008E1D7C, 0x008F0CE5,
+        0x00900C45, 0x00911E08,
+        0x009217A9, 0x009301C4,
+        0x009417AA, 0x009501C9,
+        0x00960169, 0x0097588A,
+        0x00981888, 0x00990066,
+        0x009A0709, 0x009B07A8,
+        0x009C0704, 0x009D07A6,
+        0x009E16E6, 0x009F0345,
+        0x00A000C9, 0x00A11B05,
+        0x00A20E09, 0x00A30669,
+        0x00A41885, 0x00A50065,
+        0x00A60706, 0x00A707A5,
+        0x00A803A9, 0x00A90189,
+        0x00AA0029, 0x00AB0889,
+        0x00AC0744, 0x00AD06E9,
+        0x00AE0B06, 0x00AF0229,
+        0x00B00E05, 0x00B10665,
+        0x00B21974, 0x00B30CE8,
+        0x00B4070A, 0x00B507A9,
+        0x00B616E9, 0x00B70348,
+        0x00B8074A, 0x00B906E6,
+        0x00BA0B09, 0x00BB0226,
+        0x00BC1CE4, 0x00BD0D7D,
+        0x00BE0269, 0x00BF08C9,
+        0x00C000CA, 0x00C11B04,
+        0x00C21884, 0x00C3006A,
+        0x00C40E04, 0x00C50664,
+        0x00C60708, 0x00C707AA,
+        0x00C803A8, 0x00C90184,
+        0x00CA0749, 0x00CB06E4,
+        0x00CC0020, 0x00CD0888,
+        0x00CE0B08, 0x00CF0224,
+        0x00D00E0A, 0x00D1066A,
+        0x00D20705, 0x00D307A4,
+        0x00D41D78, 0x00D50CE9,
+        0x00D616EA, 0x00D70349,
+        0x00D80745, 0x00D906E8,
+        0x00DA1CE9, 0x00DB0D75,
+        0x00DC0B04, 0x00DD0228,
+        0x00DE0268, 0x00DF08C8,
+        0x00E003A5, 0x00E10185,
+        0x00E20746, 0x00E306EA,
+        0x00E40748, 0x00E506E5,
+        0x00E61CE8, 0x00E70D79,
+        0x00E81D74, 0x00E95CE6,
+        0x00EA02E9, 0x00EB0849,
+        0x00EC02E8, 0x00ED0848,
+        0x00EE0086, 0x00EF0A08,
+        0x00F00021, 0x00F10885,
+        0x00F20B05, 0x00F3022A,
+        0x00F40B0A, 0x00F50225,
+        0x00F60265, 0x00F708C5,
+        0x00F802E5, 0x00F90845,
+        0x00FA0089, 0x00FB0A09,
+        0x00FC008A, 0x00FD0A0A,
+        0x00FE02A9, 0x00FF0062,
+    };
+
+    if (!hbmMask)
+	return NtGdiBitBlt(hdcDest, nXDest, nYDest, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, FRGND_ROP3(dwRop));
+
+    /* 1. make mask bitmap's dc */
+    hDCMask = NtGdiCreateCompatableDC(hdcDest);
+    hOldMaskBitmap = (HBITMAP)NtGdiSelectObject(hDCMask, hbmMask);
+
+    /* 2. make masked Background bitmap */
+
+    /* 2.1 make bitmap */
+    hDC1 = NtGdiCreateCompatableDC(hdcDest);
+    hBitmap2 = NtGdiCreateCompatibleBitmap(hdcDest, nWidth, nHeight);
+    hOldBitmap2 = (HBITMAP)NtGdiSelectObject(hDC1, hBitmap2);
+
+    /* 2.2 draw dest bitmap and mask */
+    NtGdiBitBlt(hDC1, 0, 0, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, SRCCOPY);
+    NtGdiBitBlt(hDC1, 0, 0, nWidth, nHeight, hdcDest, nXDest, nYDest, BKGND_ROP3(dwRop));
+    NtGdiBitBlt(hDC1, 0, 0, nWidth, nHeight, hDCMask, xMask, yMask, DSTERASE);
+
+    /* 3. make masked Foreground bitmap */
+
+    /* 3.1 make bitmap */
+    hDC2 = NtGdiCreateCompatableDC(hdcDest);
+    hBitmap3 = NtGdiCreateCompatibleBitmap(hdcDest, nWidth, nHeight);
+    hOldBitmap3 = (HBITMAP)NtGdiSelectObject(hDC2, hBitmap3);
+
+    /* 3.2 draw src bitmap and mask */
+    NtGdiBitBlt(hDC2, 0, 0, nWidth, nHeight, hdcDest, nXDest, nYDest, SRCCOPY);
+    NtGdiBitBlt(hDC2, 0, 0, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, FRGND_ROP3(dwRop));
+    NtGdiBitBlt(hDC2, 0, 0, nWidth, nHeight, hDCMask, xMask, yMask, SRCAND);
+
+    /* 4. combine two bitmap and copy it to hdcDest */
+    NtGdiBitBlt(hDC1, 0, 0, nWidth, nHeight, hDC2, 0, 0, SRCPAINT);
+    NtGdiBitBlt(hdcDest, nXDest, nYDest, nWidth, nHeight, hDC1, 0, 0, SRCCOPY);
+
+    /* 5. restore all object */
+    NtGdiSelectObject(hDCMask, hOldMaskBitmap);
+    NtGdiSelectObject(hDC1, hOldBitmap2);
+    NtGdiSelectObject(hDC2, hOldBitmap3);
+
+    /* 6. delete all temp object */
+    NtGdiDeleteObject(hBitmap2);
+    NtGdiDeleteObject(hBitmap3);
+
+    NtGdiDeleteDC(hDC1);
+    NtGdiDeleteDC(hDC2);
+    NtGdiDeleteDC(hDCMask);
+
+    return TRUE;
 }
 
 BOOL STDCALL NtGdiPlgBlt(HDC  hDCDest,