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 * Copyright (c) 2019, 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

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package sun.java2d.metal;

import sun.lwawt.LWWindowPeer;

import sun.lwawt.macosx.CFRetainedResource;

import sun.java2d.SurfaceData;

import sun.java2d.NullSurfaceData;

import java.awt.*;

import sun.awt.CGraphicsConfig;

import sun.java2d.metal.MetalGraphicsConfig;

public class MetalLayer extends CFRetainedResource {

    private native long nativeCreateLayer();

    private native long nativeInitLayer(long deviceInfo, long layer);

    //private native long nativeValidate(long layer, long view);

    //private native long nativeDraw(long layer);

    private static native void validate(long layerPtr, MetalSurfaceData msd);

    private static native void nativeSetScale(long layerPtr, double scale);

    //private static native void nativeSetScale(long layerPtr, double scale);

    //private static native void blitTexture(long layerPtr);

    private LWWindowPeer peer;

    private int scale = 1;

    private SurfaceData surfaceData; // represents intermediate buffer (texture)

    private long pNativeLayer;

    public MetalLayer(LWWindowPeer peer) {

        super(0, true);

        pNativeLayer = nativeCreateLayer();

        setPtr(pNativeLayer);

        this.peer = peer;

        // TODO : No need to initialize layer here, it will be done

        // when we initialize surface in MetalSurfaceData.

        MetalGraphicsConfig gc = (MetalGraphicsConfig)getGraphicsConfiguration();

        nativeInitLayer(gc.pConfigInfo, pNativeLayer);

    }

     public long getPointer() {

        return ptr;

    }

    public Rectangle getBounds() {

        return peer.getBounds();

    }

    public GraphicsConfiguration getGraphicsConfiguration() {

        return peer.getGraphicsConfiguration();

    }

    public boolean isOpaque() {

        return !peer.isTranslucent();

    }

    public int getTransparency() {

        return isOpaque() ? Transparency.OPAQUE : Transparency.TRANSLUCENT;

    }

    public Object getDestination() {

        return peer.getTarget();

    }

    public SurfaceData replaceSurfaceData() {

        if (getBounds().isEmpty()) {

            surfaceData = NullSurfaceData.theInstance;

            return surfaceData;

        }

        // the layer redirects all painting to the buffer's graphics

        // and blits the buffer to the layer surface (in drawInCGLContext callback)

        CGraphicsConfig gc = (CGraphicsConfig)getGraphicsConfiguration();

        surfaceData = gc.createSurfaceData(this);

        setScale(gc.getDevice().getScaleFactor());

        // the layer holds a reference to the buffer, which in

        // turn has a reference back to this layer

        if (surfaceData instanceof MetalSurfaceData) {

            validate((MetalSurfaceData)surfaceData);

        }

        return surfaceData;

    } 

    public SurfaceData getSurfaceData() {

        return surfaceData;

    }

    /*public void validate(long viewPtr) {

        //OGLRenderQueue rq = OGLRenderQueue.getInstance();

        //rq.lock();

        try {

            execute(ptr -> nativeValidate(ptr, viewPtr));

        } finally {

            //   rq.unlock();

        }

    }*/

    public void validate(final MetalSurfaceData metalsd) {

        MetalRenderQueue rq = MetalRenderQueue.getInstance();

        rq.lock();

        try {

            execute(ptr -> validate(ptr, metalsd));

        } finally {

            rq.unlock();

        }

    }

    @Override

    public void dispose() {

        // break the connection between the layer and the buffer

        validate(null);

        super.dispose();

    }

    private void setScale(final int _scale) {

        if (scale != _scale) {

            scale = _scale;

            execute(ptr -> nativeSetScale(ptr, scale));

        }

    }

    // ----------------------------------------------------------------------

    // NATIVE CALLBACKS : TODO: check how should this be done in Metal?

    // ----------------------------------------------------------------------

    public void drawInMetalContext(long viewPtr) {

        // tell the flusher thread not to update the intermediate buffer

        // until we are done blitting from it

        /*OGLRenderQueue rq = OGLRenderQueue.getInstance();

        rq.lock();

        try {

            execute(ptr -> blitTexture(ptr));

        } finally {

            rq.unlock();

        }*/

        System.out.println("drawInMetalContext method invoked");

        //nativeDraw(pNativeLayer);

    }

}