Index: subsystems/win32/win32k/objects/dibobj.c
===================================================================
--- subsystems/win32/win32k/objects/dibobj.c	(revision 33839)
+++ subsystems/win32/win32k/objects/dibobj.c	(working copy)
@@ -1326,11 +1336,18 @@
       *paletteType = PAL_INDEXED;
       RedMask = GreenMask = BlueMask = 0;
     }
+  else if(bmi->bmiHeader.biCompression == BI_BITFIELDS)
+    {
+      *paletteType = PAL_BITFIELDS;
+      RedMask = *(ULONG *)&bmi->bmiColors[0];
+      GreenMask = *(ULONG *)&bmi->bmiColors[1];
+      BlueMask = *(ULONG *)&bmi->bmiColors[2];
+    }
   else if(bits < 24)
     {
       *paletteType = PAL_BITFIELDS;
-      RedMask = 0xf800;
-      GreenMask = 0x07e0;
+      RedMask = 0x7c00;
+      GreenMask = 0x03e0;
       BlueMask = 0x001f;
     }
   else