Extract cursor image in Java

Question

I was wondering if there is a way to extract an Image object from a Cursor object in Java.

A use for this would be for instance :

Image img = extract         


        

Answer 1

Solution for Linux:

private BufferedImage getCursorImage(){
    X11 x11 = X11.INSTANCE;
    Xfixes xfixes = Xfixes.INSTANCE;

    X11.Display display = x11.XOpenDisplay(null);

    Xfixes.XFixesCursorImage cursorImage = xfixes.XFixesGetCursorImage(display);

    ByteBuffer buf = cursorImage.pixels.getPointer().getByteBuffer(0,
            cursorImage.width * cursorImage.height * NativeLong.SIZE);
    buf.order(ByteOrder.LITTLE_ENDIAN);
    BufferedImage bim = new BufferedImage(cursorImage.width, cursorImage.height, BufferedImage.TYPE_INT_ARGB);
    WritableRaster raster = bim.getRaster();
    for (int y = 0; y < cursorImage.height; y++) {
        for (int x = 0; x < cursorImage.width; x++) {
            long z = NativeLong.SIZE == 8 ? buf.getLong() : buf.getInt();
            int b = (int) ((z >> 24) & 0xFF);
            int a = (int) ((z >> 16) & 0xFF);
            int g = (int) ((z >> 8) & 0xFF);
            int r = (int) (z & 0xFF);
            raster.setPixel(x, y, new int[] { a, r, g, b });
        }
    }

    x11.XCloseDisplay(display);
    return bim;
}

JNA interface:

public interface Xfixes extends Library {

    Xfixes INSTANCE = Native.load("Xfixes", Xfixes.class);

    @Structure.FieldOrder({ "x", "y", "width", "height", "xhot", "yhot", "cursor_serial", "pixels", "atom", "name"})
    class XFixesCursorImage extends Structure {
        public short x;
        public short y;
        public short width;
        public short height;
        public short xhot;
        public short yhot;
        public NativeLong cursor_serial;

        public NativeLongByReference pixels;

        public NativeLong atom;
        public Pointer name;

        public XFixesCursorImage() {
            super();
        }
    }

    XFixesCursorImage XFixesGetCursorImage(X11.Display dpy);
}