Method scaleImageIcon

ij/src/main/java/ij/gui/GUI.java:582–610

(ImageIcon in, double factor)

	}

	@AstroImageJ(reason = "Scale frames")
	private static ImageIcon scaleImageIcon(ImageIcon in, double factor) {
		if (in == null || factor <= 0) {
			return in;
		}

		var img = in.getImage();
		if (img == null) {
			return in;
		}

		var w = img.getWidth(null);
		var h = img.getHeight(null);
		if (w <= 0 || h <= 0) {
			return in;
		}

		var nw = Math.max(1, (int) Math.round(w * factor));
		var nh = Math.max(1, (int) Math.round(h * factor));

		var bufferedImage = new BufferedImage(nw, nh, BufferedImage.TYPE_INT_ARGB);
		var g2 = bufferedImage.createGraphics();
		g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
		g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
		g2.drawImage(img, 0, 0, nw, nh, null);
		g2.dispose();

		return new ImageIcon(bufferedImage, in.getDescription());
	}

	/** Works around an OpenJDK bug on Windows that
	 * causes the scrollbar thumb color and background