How to draw image in gray in SWT

I am using following c开发者_如何学Pythonode to draw scaled image in PaintListener.

e.gc.drawImage(image,
    0, 0, w, h,
    0, 0, scaledWidth, scaledHeight
);

I want to draw image in gray color.

What could be done for that? Does drawImage support some special parameters for that or I should better prepare and convert original image to be grayed.

You should first convert it to Greyed version before drawing it. GraphicsContext simply draws what you want it to draw.

I need to convert it either to greyed-out/disabled using Image class:

greyed = new Image(e.display, image, SWT.IMAGE_GRAY);

e.gc.drawImage(greyed,
    0, 0, w, h,
    0, 0, scaledWidth, scaledHeight
);

SWT.IMAGE_DISABLE also can be used instead of SWT.IMAGE_GRAY