Mac OS上不支持Java页面翻转？

Question

我希望有人碰巧以前遇到过以下问题。

我的Java应用程序在Mac上有图形性能问题，所以我做了一个简单的测试应用程序（代码如下）。当我在Windows上运行这个程序时，控制台告诉我："GraphicsConfiguration flipping?

GraphicsConfiguration flipping?true BufferStrategy flipping?

当我在Mac OS上运行完全相同的代码时，我得到的是

GraphicsConfiguration flipping?true BufferStrategy flipping?

这是否意味着在Mac OS上，翻页在窗口式应用中根本不支持？有什么技巧可以让页面翻转在Mac OS上工作而不至于全屏？

欢迎大家提供建议，Mattijs。

在Windows XP和Mac OS 10.5上使用JDK 1.6。

代码。

import java.awt.image.BufferStrategy;
import javax.swing.*;
import java.awt.*;

public class Test {
 int width = 640;
 int height = 480;

 GraphicsEnvironment graphEnv = GraphicsEnvironment.getLocalGraphicsEnvironment();
 GraphicsDevice graphDevice = graphEnv.getDefaultScreenDevice();
 GraphicsConfiguration graphicConf = graphDevice.getDefaultConfiguration();

 public Test() {
  JFrame jFrame = new JFrame(graphicConf);
  jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  jFrame.setTitle("double buffer test");
  jFrame.setResizable(false);
  jFrame.setFocusTraversalKeysEnabled(false);

  Canvas canvas = new Canvas();
  canvas.setSize(width, height);
  canvas.setIgnoreRepaint(true);

  jFrame.getContentPane().add(canvas);
  jFrame.pack();
  jFrame.setVisible(true);

  System.out.println("GraphicsConfiguration flipping? " + graphicConf.getBufferCapabilities().isPageFlipping());
  canvas.createBufferStrategy(2);
  BufferStrategy bufferStrategy = canvas.getBufferStrategy();
  System.out.println("BufferStrategy flipping? " + bufferStrategy.getCapabilities().isPageFlipping());

  while(true) {
    Graphics g = bufferStrategy.getDrawGraphics();
    g.setColor(Color.BLACK);
    g.fillRect(0,0,width,height);
    g.setColor(Color.RED);
    g.drawLine((int)(Math.random()*width),(int)(Math.random()*height),
               (int)(Math.random()*width),(int)(Math.random()*height));
    bufferStrategy.show();
    g.dispose();
  }
 }

 public static void main(String[] args) {
  new Test();
 }
}

Answer 1

坏消息：我在相同的Mac OS X配置上得到相同的结果。好消息是：我的Java应用程序在Mac上出现了图形性能问题。isAccelerated() 是真的。

System.out.println("BufferStrategy accelerated? " + bufferStrategy
    .getCapabilities().getFrontBufferCapabilities().isAccelerated());

而不是 Canvas 和 BufferStrategy，我只用 new JPanel(true).

增编。例如：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class NewTest extends JPanel implements ActionListener, Runnable {

    private Random r = new Random();
    private Timer t = new Timer(10, this);

    public static void main(String[] args) {
        EventQueue.invokeLater(new NewTest());
    }

    @Override
    public void run() {
        JFrame f = new JFrame("NewTest");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(this);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
        t.start();
    }

    public NewTest() {
        super(true);
        this.setPreferredSize(new Dimension(640, 480));
    }

    @Override
    protected void paintComponent(Graphics g) {
        int width = this.getWidth();
        int height = this.getHeight();
        g.setColor(Color.BLACK);
        g.fillRect(0, 0, width, height);
        g.setColor(Color.RED);
        g.drawLine(r.nextInt(width), r.nextInt(height),
            r.nextInt(width), r.nextInt(height));

    }

    @Override
    public void actionPerformed(ActionEvent e) {
        this.repaint();
    }
}

Answer 2

在Linux上，当我设置命令行参数-Dun.java2d.opengl=true时，这种情况就会发生，所以不妨试试做相反的设置-Dun.java2d.opengl=false