Mac OS上不支持Java页面翻转？ [英] Java page flipping not supported on Mac OS?

问题描述

我希望有人偶然发现以下问题。

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上运行时，控制台告诉我：

GraphicsConfiguration翻转？ true

BufferStrategy翻转？真的

当我在Mac OS上运行完全相同的代码时，我得到：

图形配置翻转？ true

BufferStrategy翻转？ false

这是否意味着在Mac OS上，页面翻转在窗口应用程序中根本不受支持？有没有办法在Mac OS上进行翻页功能，而不用全屏？

所有指针都非常受欢迎，

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）（的Math.random（）*高度））; 
 bufferStrategy.show（）; 
 g.dispose（）; 
} 
} 
 
 public static void main（String [] args）{
 new Test（）; 
} 
} 
  

解决方案

坏消息：我在相同的Mac OS X配置中获得相同的结果。好消息： isAccelerated（）是true。

  System.out .println（BufferStrategy acceleration？+ bufferStrategy 
 .getCapabilities（）。getFrontBufferCapabilities（）。isAccelerated（））; 
  

而不是 Canvas 和 BufferStrategy ，我只是使用 new JPanel（true） 。

附录：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扩展JPanel实现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（）; 
} 
} 
  

I'm hoping someone happens to have stumbled upon the following issue before.

My Java application has graphics performance issues on Mac, so I made a simple test application (code below). When I run this on Windows, the console tells me:

GraphicsConfiguration flipping? true
BufferStrategy flipping? true

When I run the exact same code on Mac OS, I get:

GraphicsConfiguration flipping? true
BufferStrategy flipping? false

Does this mean that on Mac OS, page flipping is simply not supported in a windowed application? Are there any tricks to make page flipping work on Mac OS without going full screen?

All pointers are very welcome,
Mattijs

Using JDK 1.6 on Windows XP and Mac OS 10.5.

The code:

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();
 }
}

解决方案

The bad news: I get the same result on the same Mac OS X configuration. The good news: isAccelerated() is true.

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

Instead of Canvas and BufferStrategy, I just use new JPanel(true).

Addendum: For example,

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();
    }
}

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