ScreenshotFactory.java

package com.bc.memorytest;

import java.nio.ByteBuffer;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.files.FileHandle;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.Pixmap.Format;
import com.badlogic.gdx.graphics.PixmapIO;

/**
 * Class used to take screenshots.
 * 
 * @author https://github.com/libgdx/libgdx/wiki/Take-a-Screenshot
 */
public class ScreenshotFactory
{
    public static void saveScreenshot(String filename)
    {
        try
        {
            Gdx.files.local(filename + ".png").delete();
            FileHandle fh = Gdx.files.local(filename + ".png");
            if (fh.exists())
            {
                fh.delete(); // delete file if it exists
            }
            
//            do
//            {
//                fh = new FileHandle(filename + ".png");
//                fh.delete(); // delete file if it exists
//            }
//            while (fh.exists());
            
            Pixmap pixmap = getScreenshot(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), false);
            PixmapIO.writePNG(fh, pixmap);
            pixmap.dispose();
        }
        catch (Exception e)
        {
            System.out.println(e);
        }
    }

    private static Pixmap getScreenshot(int x, int y, int w, int h, boolean flipY)
    {
        Gdx.gl.glPixelStorei(GL20.GL_PACK_ALIGNMENT, 1);

        final Pixmap pixmap = new Pixmap(w, h, Format.RGBA8888);
        ByteBuffer pixels = pixmap.getPixels();
        Gdx.gl.glReadPixels(x, y, w, h, GL20.GL_RGBA, GL20.GL_UNSIGNED_BYTE, pixels);

        final int numBytes = w * h * 4;
        byte[] lines = new byte[numBytes];
        if (flipY)
        {
            pixels.clear();
            pixels.get(lines);
        }
        else
        {
            final int numBytesPerLine = w * 4;
            for (int i = 0; i < h; i++)
            {
                pixels.position((h - i - 1) * numBytesPerLine);
                pixels.get(lines, i * numBytesPerLine, numBytesPerLine);
            }
            pixels.clear();
            pixels.put(lines);
        }
        return pixmap;
    }
}