12.3、Libgdx的图像之截屏

（官网：www.libgdx.cn）

接下来的示例说明怎样进行截屏并且保存为PNG格式。

public class ScreenshotFactory {
private static int counter = 1;
public static void saveScreenshot(){
    try{
        FileHandle fh;
        do{
            fh = new FileHandle("screenshot" + counter++ + ".png");
        }while (fh.exists());
        Pixmap pixmap = getScreenshot(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), false);
        PixmapIO.writePNG(fh, pixmap);
        pixmap.dispose();
    }catch (Exception e){           
    }
}

private static Pixmap getScreenshot(int x, int y, int w, int h, boolean yDown){
    final Pixmap pixmap = ScreenUtils.getFrameBufferPixmap(x, y, w, h);
    if (yDown) {
        ByteBuffer pixels = pixmap.getPixels();
        int numBytes = w * h * 4;
        byte[] lines = new byte[numBytes];
        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;
}
}