/*

 * 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

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package sun.java2d.metal;

import sun.java2d.NullSurfaceData;

import sun.java2d.SurfaceData;

import sun.lwawt.LWWindowPeer;

import sun.lwawt.macosx.CFRetainedResource;

import java.awt.*;

public class MTLLayer extends CFRetainedResource {

    private native long nativeCreateLayer();

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

    private static native void validate(long layerPtr, MTLSurfaceData cglsd);

    private LWWindowPeer peer;

    private int scale = 1;

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

    public MTLLayer(LWWindowPeer peer) {

        super(0, true);

        setPtr(nativeCreateLayer());

        this.peer = peer;

    }

    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)

        MTLGraphicsConfig gc = (MTLGraphicsConfig)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 MTLSurfaceData) {

            validate((MTLSurfaceData)surfaceData);

        }

        return surfaceData;

    }

    public SurfaceData getSurfaceData() {

        return surfaceData;

    }

    public void validate(final MTLSurfaceData cglsd) {

        MTLRenderQueue rq = MTLRenderQueue.getInstance();

        rq.lock();

        try {

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

        } 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));

        }

    }

}