RFR: 8191406: [hidpi] sun/java2d/SunGraphics2D/DrawImageBilinear.java test fails

[Sergey Bylokhov]

On Thu, 17 Nov 2022 08:20:54 GMT, Jayathirth D V <jdv at openjdk.org> wrote:

> This test was failing because of timing or color difference issues.
> Updated test to:
> 
> 1) Use EDT for UI drawing instead of manual synchronisation
> 2) Use Robot.waitForIdle before screen capture
> 3) Increase color tolerance delta from 1 to 5
> 4) Use undecorated frame and explicitly set background color and move the frame to top
> 5) Cleanup to remove not needed flags and java options
> 
> After these changes test passes on all platforms in CI except Linux. For Linux it looks like product issue so i have raised : https://bugs.openjdk.org/browse/JDK-8297175

test/jdk/sun/java2d/SunGraphics2D/DrawImageBilinear.java line 151:

> 149:         frame = new Frame();
> 150:         frame.add(test);
> 151:         frame.setBackground(Color.WHITE);

How the specific background color helps the test to pass, as far as I understand it should not affect the test, no?

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PR: https://git.openjdk.org/jdk/pull/11201