On Tue, 20 Feb 2024 05:34:00 GMT, Sergey Bylokhov <s...@openjdk.org> wrote:
>> src/java.desktop/share/classes/javax/swing/BufferStrategyPaintManager.java >> line 252: >> >>> 250: >>> g2d.setBackground(paintingComponent.getBackground()); >>> 251: g2d.clearRect(x, y, w, h); >>> 252: g2d.setBackground(oldBg); >> >> I wonder what color should we use to clear the background? Should it be >> background color of the component, background color of the window, or >> (0,0,0)? What the Swing components usually do in that case? > > Since this is an intermediate buffer its content should not affect the > rendering, so it should contain only the image rendered by the component > itself. This how it is done in [RepaintManager](https://github.com/openjdk/jdk/blob/69a11c7f7ea7c4195a8ee56391bdf04c75bd8156/src/java.desktop/share/classes/javax/swing/RepaintManager.java#L1711), it uses background color of the component. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/17081#discussion_r1495265755
