gdiplus: Added GdipMultiplyMatrix.
diff --git a/include/gdiplusenums.h b/include/gdiplusenums.h
index 4f5b193..eb807ce 100644
--- a/include/gdiplusenums.h
+++ b/include/gdiplusenums.h
@@ -151,6 +151,12 @@
     DashStyleCustom
 };
 
+enum MatrixOrder
+{
+    MatrixOrderPrepend = 0,
+    MatrixOrderAppend  = 1
+};
+
 #ifndef __cplusplus
 
 typedef enum Unit Unit;
@@ -166,6 +172,7 @@
 typedef enum PixelOffsetMode PixelOffsetMode;
 typedef enum DashCap DashCap;
 typedef enum DashStyle DashStyle;
+typedef enum MatrixOrder MatrixOrder;
 
 #endif /* end of c typedefs */