--- /dev/null	2019-03-05 14:31:16.000000000 +0300
+++ new/src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLMaskBlit.m	2019-03-05 14:31:16.000000000 +0300
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#ifndef HEADLESS
+
+#include <stdlib.h>
+#include <jlong.h>
+
+#include "MTLMaskBlit.h"
+#include "MTLRenderQueue.h"
+#include "MTLSurfaceDataBase.h"
+
+/**
+ * REMIND: This method assumes that the dimensions of the incoming pixel
+ *         array are less than or equal to the cached blit texture tile;
+ *         these are rather fragile assumptions, and should be cleaned up...
+ */
+void
+MTLMaskBlit_MaskBlit(JNIEnv *env, MTLContext *mtlc,
+                     jint dstx, jint dsty,
+                     jint width, jint height,
+                     void *pPixels)
+{
+    //TODO
+    J2dTraceNotImplPrimitive("MTLMaskBlit_MaskBlit");
+    J2dTraceLn(J2D_TRACE_INFO, "MTLMaskBlit_MaskBlit");
+
+    if (width <= 0 || height <= 0) {
+        J2dTraceLn(J2D_TRACE_WARNING,
+                   "MTLMaskBlit_MaskBlit: invalid dimensions");
+        return;
+    }
+}
+
+#endif /* !HEADLESS */