Drawing on a transparent image using Java SWT

Question

How do I create an in-memory fully transparent SWT image and draw a black line on it with antialias enabled?

I expect the result to include only black color and alph

Answer 1

This is how I did and it works:

    Image src = new Image(null, 16, 16);        
    ImageData imageData = src.getImageData();
    imageData.transparentPixel = imageData.getPixel(0, 0);
    src.dispose();
    Image icon = new Image(null, imageData);
    //draw on the icon with gc