是否可以更快地替代java.awt.Robot.createScreenCapture？

Question

我正在制作一个程序，要求至少每秒捕获24个屏幕截图。目前，使用下面的代码，我每94毫秒仅获得1个，因此大约为10毫秒。

我不想使用任何第三方库，因为我试图将其保持尽可能小，但是如果我希望获得显着的性能提升，我会愿意的。我也试图保持该平台独立，但是，如果确实能够显着提高性能，我愿意将其限于Windows。

编辑：我现在也尝试了两种不同的方法；使用在oracles网站上找到的代码段，并在下面的注释中指出了该代码段。这三者都花了大约2.1-220万纳秒的时间，实在是太低效了。

public abstract class Benchmark {

    private final int iterations;

    public Benchmark(int iterations) {
        this.iterations = iterations;
    }

    public abstract void logic();

    public void start() {
        long start = System.nanoTime();
        for (int iteration = 0; iteration < iterations; iteration++) {
            long iterationStart = System.nanoTime();
            logic();
            System.out.println("iteration: " + iteration + " took: " + (System.nanoTime() - iterationStart) + " nanoseconds.");
        }
        long total = (System.nanoTime() - start);
        System.out.println(iterations + " iterations took: " + total + " nanoseconds.  Average iteration was: " + (total / iterations));
    }
}

_

import java.awt.AWTException;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;

public class RobotBenchmark extends Benchmark {

    private final Robot robot;
    private final Rectangle screen;

    public static void main(String[] args) {
        Benchmark benchmark;
        try {
            benchmark = new RobotBenchmark(24);
            benchmark.start();
        } catch (AWTException e) {
            e.printStackTrace();
        }
    }

    public RobotBenchmark(int iterations) throws AWTException {
        super(iterations);
        robot = new Robot();
        screen = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
    }

    @Override
    public void logic() {
        robot.createScreenCapture(screen);
    }

}

_

import java.awt.AWTException;
import java.awt.GraphicsDevice;
import java.awt.HeadlessException;
import java.awt.Rectangle;

public class DirectRobotBenchmark extends Benchmark {

    private final GraphicsDevice device;
    private final Rectangle screenRectangle;
    private final DirectRobot robot;

    private int[] screen;

    public static void main(String[] args) {
        Benchmark benchmark;
        try {
            benchmark = new DirectRobotBenchmark(24);
            benchmark.start();
        } catch (HeadlessException | AWTException e) {
            e.printStackTrace();
        }
    }

    public DirectRobotBenchmark(int iterations) throws HeadlessException, AWTException {
        super(iterations);
        device = DirectRobot.getDefaultScreenDevice();
        screenRectangle = new Rectangle(1920, 1080);
        robot = new DirectRobot(device);
        screen = new int[screenRectangle.width * screenRectangle.height];
    }

    @Override
    public void logic() {
        screen = robot.getRGBPixels(screenRectangle);
    }
}

_

import java.awt.AWTException;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.peer.RobotPeer;

import sun.awt.SunToolkit;

@SuppressWarnings("restriction")
public class RobotPeerBenchmark extends Benchmark {

    private final SunToolkit toolkit;
    private final RobotPeer peer;
    private final Rectangle screenRectangle;

    private int[] screen;

    public static void main(String[] args) {
        try {
            Benchmark robotPeerBenchmark = new RobotPeerBenchmark(24);
            robotPeerBenchmark.start();
        } catch (AWTException e) {
            e.printStackTrace();
        }
    }

    public RobotPeerBenchmark(int iterations) throws AWTException {
        super(iterations);
        toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
        peer = toolkit.createRobot(new Robot(), GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice());
        screenRectangle = new Rectangle(toolkit.getScreenSize());
        screen = new int[screenRectangle.width * screenRectangle.height];
    }

    @Override
    public void logic() {
        screen = peer.getRGBPixels(screenRectangle);
    }
}

Answer 1

唯一的方法就是通过JNI或JNA。我做了一些基准测试和本机屏幕捕获API，与Robots 8 FPS相比，它能够维持约45
FPS。我可能会开始从事JNI项目，以在不久的将来解决此问题。如果可以的话，我将使用项目URL更新此帖子。