java - 使用 LWJGL 进行桌面捕获

Question

我想创建一个用于捕获桌面并将其保存到文件的应用程序。

我为此编写了一些 LWJGL 代码。然而它只捕获 OpenGL 窗口。

这是我使用的代码片段。

private static void screenShot(){
    //Creating an rbg array of total pixels
    int[] pixels = new int[WIDTH * HEIGHT];
    int bindex;
    // allocate space for RBG pixels
    ByteBuffer fb = ByteBuffer.allocateDirect(WIDTH * HEIGHT * 3);

    // grab a copy of the current frame contents as RGB
    GL11.glReadPixels(0, 0, WIDTH, HEIGHT, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, fb);

    BufferedImage imageIn = new BufferedImage(WIDTH, HEIGHT,BufferedImage.TYPE_INT_RGB);
    // convert RGB data in ByteBuffer to integer array
    for (int i=0; i < pixels.length; i++) {
        bindex = i * 3;
        pixels[i] =
            ((fb.get(bindex) << 16))  +
            ((fb.get(bindex+1) << 8))  +
            ((fb.get(bindex+2) << 0));
    }
    //Allocate colored pixel to buffered Image
    imageIn.setRGB(0, 0, WIDTH, HEIGHT, pixels, 0 , WIDTH);

    //Creating the transformation direction (horizontal)
    AffineTransform at =  AffineTransform.getScaleInstance(1, -1);
    at.translate(0, -imageIn.getHeight(null));

    //Applying transformation
    AffineTransformOp opRotated = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
    BufferedImage imageOut = opRotated.filter(imageIn, null);

    try {//Try to screate image, else show exception.
        File output1 = new File("image.png"); 
        ImageIO.write(imageOut, "PNG" , output1);
    }
    catch (Exception e) {
        System.out.println("ScreenShot() exception: " +e);
    }
}

我尝试过的另一种是:

public static BufferedImage glScreenshot() {
    GL11.glReadBuffer(GL11.GL_FRONT);
    int w = Display.getDisplayMode().getWidth();
    int h = Display.getDisplayMode().getHeight();
    int bpp = 4;
    ByteBuffer buffer = BufferUtils.createByteBuffer(w * h * bpp);

    GL11.glReadPixels(0, 0, w, h, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buffer);

    BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

    for (int x = 0; x < w; x++) {
        for (int y = 0; y < h; y++) {
            int i = (x + (w * y)) * bpp;
            int r = buffer.get(i) & 0xFF;
            int g = buffer.get(i + 1) & 0xFF;
            int b = buffer.get(i + 2) & 0xFF;
            image.setRGB(x, h - (y + 1), (0xFF << 24) | (r << 16) | (g << 8) | b);
        }
    }

    return image;
}

是否可以使用 LWJGL 捕获桌面？

Answer 1

您无法使用 LWJGL 或 OpenGL 捕获桌面。 Opengl 只处理它自己的帧缓冲区，然后将其打印在屏幕上。任何不在帧缓冲区(或在您自己的程序中)的东西，例如其他程序、桌面等，都不会传递给 OpenGL，因此它无法读取该数据。但是，java.awt 有一个类可以让您捕获屏幕。请参阅here .