--- /dev/null	2019-05-16 19:16:39.000000000 +0300
+++ new/src/java.desktop/macosx/classes/sun/java2d/metal/MTLUtilities.java	2019-05-16 19:16:39.000000000 +0300
@@ -0,0 +1,326 @@
+/*
+ * Copyright (c) 2011, 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.
+ */
+
+package sun.java2d.metal;
+
+import sun.java2d.SunGraphics2D;
+import sun.java2d.SurfaceData;
+import sun.java2d.pipe.Region;
+
+import java.awt.*;
+
+/**
+ * This class contains a number of static utility methods that may be
+ * called (via reflection) by a third-party library in order
+ * to interoperate with the metal-based Java 2D pipeline.
+ *
+ */
+class MTLUtilities {
+
+    /**
+     * These OGL-specific surface type constants are the same as those
+     * defined in the MTLSurfaceData class and are duplicated here so that
+     * clients of this API can access them more easily via reflection.
+     */
+    public static final int UNDEFINED       = MTLSurfaceData.UNDEFINED;
+    public static final int WINDOW          = MTLSurfaceData.WINDOW;
+    public static final int TEXTURE         = MTLSurfaceData.TEXTURE;
+    public static final int FLIP_BACKBUFFER = MTLSurfaceData.FLIP_BACKBUFFER;
+    public static final int RT_TEXTURE      = MTLSurfaceData.RT_TEXTURE;
+
+    private MTLUtilities() {
+    }
+
+    /**
+     * Returns true if the current thread is the OGL QueueFlusher thread.
+     */
+    public static boolean isQueueFlusherThread() {
+        return MTLRenderQueue.isQueueFlusherThread();
+    }
+
+    /**
+     * Invokes the given Runnable on the MTL QueueFlusher thread with the
+     * MTL context corresponding to the given Graphics object made
+     * current.  It is legal for MTL code executed in the given
+     * Runnable to change the current MTL context; it will be reset
+     * once the Runnable completes.  No guarantees are made as to the
+     * state of the MTL context of the Graphics object; for
+     *
+     * In order to avoid deadlock, it is important that the given Runnable
+     * does not attempt to acquire the AWT lock, as that will be handled
+     * automatically as part of the {@code rq.flushAndInvokeNow()} step.
+     *
+     * @param g the Graphics object for the corresponding destination surface;
+     * if null, the step making a context current to the destination surface
+     * will be skipped
+     * @param r the action to be performed on the QFT; cannot be null
+     * @return true if the operation completed successfully, or false if
+     * there was any problem making a context current to the surface
+     * associated with the given Graphics object
+     */
+    public static boolean invokeWithMTLContextCurrent(Graphics g, Runnable r) {
+        MTLRenderQueue rq = MTLRenderQueue.getInstance();
+        rq.lock();
+        try {
+            if (g != null) {
+                if (!(g instanceof SunGraphics2D)) {
+                    return false;
+                }
+                SurfaceData sData = ((SunGraphics2D)g).surfaceData;
+                if (!(sData instanceof MTLSurfaceData)) {
+                    return false;
+                }
+
+                // make a context current to the destination surface
+                MTLContext.validateContext((MTLSurfaceData)sData);
+            }
+
+            // invoke the given runnable on the QFT
+            rq.flushAndInvokeNow(r);
+
+            // invalidate the current context so that the next time we render
+            // with Java 2D, the context state will be completely revalidated
+            MTLContext.invalidateCurrentContext();
+        } finally {
+            rq.unlock();
+        }
+
+        return true;
+    }
+
+    /**
+     * Invokes the given Runnable on the MTL QueueFlusher thread with the
+     * "shared" MTL context (corresponding to the given
+     * GraphicsConfiguration object) made current.  This method is typically
+     * used when the Runnable needs a current context to complete its
+     * operation, but does not require that the context be made current to
+     * a particular surface.  For example, an application may call this
+     * method so that the given Runnable can query the OpenGL capabilities
+     * of the given GraphicsConfiguration, without making a context current
+     * to a dummy surface (or similar hacky techniques).
+     *
+     * In order to avoid deadlock, it is important that the given Runnable
+     * does not attempt to acquire the AWT lock, as that will be handled
+     * automatically as part of the {@code rq.flushAndInvokeNow()} step.
+     *
+     * @param config the GraphicsConfiguration object whose "shared"
+     * context will be made current during this operation; if this value is
+     * null or if MTL is not enabled for the GraphicsConfiguration, this
+     * method will return false
+     * @param r the action to be performed on the QFT; cannot be null
+     * @return true if the operation completed successfully, or false if
+     * there was any problem making the shared context current
+     */
+    public static boolean
+    invokeWithMTLSharedContextCurrent(GraphicsConfiguration config,
+                                      Runnable r)
+    {
+        if (!(config instanceof MTLGraphicsConfig)) {
+            return false;
+        }
+
+        MTLRenderQueue rq = MTLRenderQueue.getInstance();
+        rq.lock();
+        try {
+            // make the "shared" context current for the given GraphicsConfig
+            MTLContext.setScratchSurface((MTLGraphicsConfig)config);
+
+            // invoke the given runnable on the QFT
+            rq.flushAndInvokeNow(r);
+
+            // invalidate the current context so that the next time we render
+            // with Java 2D, the context state will be completely revalidated
+            MTLContext.invalidateCurrentContext();
+        } finally {
+            rq.unlock();
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns the Rectangle describing the MTL viewport on the
+     * Java 2D surface associated with the given Graphics object and
+     * component width and height. When a third-party library is
+     * performing MTL rendering directly into the visible region of
+     * the associated surface, this viewport helps the application
+     * position the MTL output correctly on that surface.
+     *
+     * Note that the x/y values in the returned Rectangle object represent
+     * the lower-left corner of the viewport region, relative to the
+     * lower-left corner of the given surface.
+     *
+     * @param g the Graphics object for the corresponding destination surface;
+     * cannot be null
+     * @param componentWidth width of the component to be painted
+     * @param componentHeight height of the component to be painted
+     * @return a Rectangle describing the MTL viewport for the given
+     * destination surface and component dimensions, or null if the given
+     * Graphics object is invalid
+     */
+    public static Rectangle getMTLViewport(Graphics g,
+                                           int componentWidth,
+                                           int componentHeight)
+    {
+        if (!(g instanceof SunGraphics2D)) {
+            return null;
+        }
+
+        SunGraphics2D sg2d = (SunGraphics2D)g;
+        SurfaceData sData = sg2d.surfaceData;
+
+        // this is the upper-left origin of the region to be painted,
+        // relative to the upper-left origin of the surface
+        // (in Java2D coordinates)
+        int x0 = sg2d.transX;
+        int y0 = sg2d.transY;
+
+        // this is the lower-left origin of the region to be painted,
+        // relative to the lower-left origin of the surface
+        // (in OpenGL coordinates)
+        Rectangle surfaceBounds = sData.getBounds();
+        int x1 = x0;
+        int y1 = surfaceBounds.height - (y0 + componentHeight);
+
+        return new Rectangle(x1, y1, componentWidth, componentHeight);
+    }
+
+    /**
+     * Returns the Rectangle describing the MTL scissor box on the
+     * Java 2D surface associated with the given Graphics object.  When a
+     * third-party library is performing MTL rendering directly
+     * into the visible region of the associated surface, this scissor box
+     * must be set to avoid drawing over existing rendering results.
+     *
+     * Note that the x/y values in the returned Rectangle object represent
+     * the lower-left corner of the scissor region, relative to the
+     * lower-left corner of the given surface.
+     *
+     * @param g the Graphics object for the corresponding destination surface;
+     * cannot be null
+     * @return a Rectangle describing the MTL scissor box for the given
+     * Graphics object and corresponding destination surface, or null if the
+     * given Graphics object is invalid or the clip region is non-rectangular
+     */
+    public static Rectangle getOGLScissorBox(Graphics g) {
+        if (!(g instanceof SunGraphics2D)) {
+            return null;
+        }
+
+        SunGraphics2D sg2d = (SunGraphics2D)g;
+        SurfaceData sData = sg2d.surfaceData;
+        Region r = sg2d.getCompClip();
+        if (!r.isRectangular()) {
+            // caller probably doesn't know how to handle shape clip
+            // appropriately, so just return null (Swing currently never
+            // sets a shape clip, but that could change in the future)
+            return null;
+        }
+
+        // this is the upper-left origin of the scissor box relative to the
+        // upper-left origin of the surface (in Java 2D coordinates)
+        int x0 = r.getLoX();
+        int y0 = r.getLoY();
+
+        // this is the width and height of the scissor region
+        int w = r.getWidth();
+        int h = r.getHeight();
+
+        // this is the lower-left origin of the scissor box relative to the
+        // lower-left origin of the surface (in OpenGL coordinates)
+        Rectangle surfaceBounds = sData.getBounds();
+        int x1 = x0;
+        int y1 = surfaceBounds.height - (y0 + h);
+
+        return new Rectangle(x1, y1, w, h);
+    }
+
+    /**
+     * Returns an Object identifier for the Java 2D surface associated with
+     * the given Graphics object.  This identifier may be used to determine
+     * whether the surface has changed since the last invocation of this
+     * operation, and thereby whether the MTL state corresponding to the
+     * old surface must be destroyed and recreated.
+     *
+     * @param g the Graphics object for the corresponding destination surface;
+     * cannot be null
+     * @return an identifier for the surface associated with the given
+     * Graphics object, or null if the given Graphics object is invalid
+     */
+    public static Object getMTLSurfaceIdentifier(Graphics g) {
+        if (!(g instanceof SunGraphics2D)) {
+            return null;
+        }
+        return ((SunGraphics2D)g).surfaceData;
+    }
+
+    /**
+     * Returns one of the MTL-specific surface type constants (defined in
+     * this class), which describes the surface associated with the given
+     * Graphics object.
+     *
+     * @param g the Graphics object for the corresponding destination surface;
+     * cannot be null
+     * @return a constant that describes the surface associated with the
+     * given Graphics object; if the given Graphics object is invalid (i.e.
+     * is not associated with an OpenGL surface) this method will return
+     * {@code MTLUtilities.UNDEFINED}
+     */
+    public static int getMTLSurfaceType(Graphics g) {
+        if (!(g instanceof SunGraphics2D)) {
+            return UNDEFINED;
+        }
+        SurfaceData sData = ((SunGraphics2D)g).surfaceData;
+        if (!(sData instanceof MTLSurfaceData)) {
+            return UNDEFINED;
+        }
+        return ((MTLSurfaceData)sData).getType();
+    }
+
+    /**
+     * Returns the MTL texture target constant (either GL_TEXTURE_2D
+     * or GL_TEXTURE_RECTANGLE_ARB) for the surface associated with the
+     * given Graphics object.  This method is only useful for those surface
+     * types that are backed by an MTL texture, namely {@code TEXTURE},
+     * {@code RT_TEXTURE}, and (on Windows only) {@code PBUFFER}.
+     *
+     * @param g the Graphics object for the corresponding destination surface;
+     * cannot be null
+     * @return the texture target constant for the surface associated with the
+     * given Graphics object; if the given Graphics object is invalid (i.e.
+     * is not associated with an MTL surface), or the associated surface
+     * is not backed by an OpenGL texture, this method will return zero.
+     */
+    public static int getMTLTextureType(Graphics g) {
+        if (!(g instanceof SunGraphics2D)) {
+            return 0;
+        }
+        SurfaceData sData = ((SunGraphics2D)g).surfaceData;
+        if (!(sData instanceof MTLSurfaceData)) {
+            return 0;
+        }
+        return ((MTLSurfaceData)sData).getTextureTarget();
+    }
+}