src/third_party/skia/platform_tools/android/apps/skar_java/src/main/java/com/google/skar/examples/helloskar/app/CanvasARSurfaceView.java

/*
 * Copyright 2018 Google LLC All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.skar.examples.helloskar.app;

import android.content.Context;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

/**
 * SurfaceView that is overlayed on top of a GLSurfaceView. All Canvas 2D drawings can be done on
 * this surface.
 */

public class CanvasARSurfaceView extends SurfaceView implements SurfaceHolder.Callback {

    boolean running;

    public CanvasARSurfaceView(Context context, AttributeSet attrs) {
        super(context, attrs);

        SurfaceHolder holder = getHolder();
        this.setBackgroundColor(Color.TRANSPARENT);
        this.setZOrderOnTop(true);
        holder.setFormat(PixelFormat.TRANSPARENT);
        holder.addCallback(this);
    }

    public boolean isRunning() {
        return running;
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        running = true;
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        running = false;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}
}