Description Stefan Winkler 2015-03-08 13:36:01 EDT

The following test code fails on Mac OS X:

	@Test 
	public void testTransparentForeground()
	{
		Label label = createTestLabel(); // create display, shell and label
		Color transparent = Display.getDefault().getSystemColor(SWT.COLOR_TRANSPARENT);
		label.setForeground(transparent);
		
		int expected = transparent.getRGBA().alpha;
		int actual = label.getForeground().getRGBA().alpha;
		
		assertEquals(expected, actual);
	}


Culprit is this piece of code 

Color getForegroundColor () {
	return foreground != null ? Color.cocoa_new (display, foreground) : defaultForeground ();
}

which calls this one

public static Color cocoa_new(Device device, double /*float*/ [] handle) {
	return cocoa_new(device, handle, 255);
}

As can be seen, the last parameter (alpha) is set to the constant 255 instead of taking it from the handle[] array which contains the alpha channel at position 3.