> The two tests `ScreenCaptureGtkTest.java` and 
> `HiDPIRobotScreenCaptureTest.java` under `java/awt/Robot/HiDPIScreenCapture` 
> started to intermittently fail under Windows and Linux after the [recent 
> changes](https://github.com/openjdk/jdk/commit/cc7cf81256ed4d74493472017b1c4df20fa2208a)
>  made exclusively for the Linux `Robot` implementation.
> 
> `HiDPIRobotScreenCaptureTest.java`
> Since the Windows failures cannot possibly have their origin in the fix made 
> - the latter being Linux-only - the test apparently either exposes an 
> existing bug in the Windows `Robot` or is bumping against a peculiarity of 
> that platform. The test is reverted back to its original form that didn't 
> fail.
> 
> `ScreenCaptureGtkTest.java`
> The coordinates in the log `(83, 78)` of a failure are higher up than the 
> test suggests `(83, 97)`. I've seen similar failures on Ubuntu 20.04 when the 
> coordinates were set to `(0, 0)`. The color then picked matched the color of 
> the bar drawn at the top of the screen. I believe it's best to place the test 
> pixels towards the center of the window to avoid desktop elements 
> interference.
> 
> The other possible reason for intermittent failures are window coordinates. 
> Suppose that the test is executing with `sun.java2d.uiScale` set to 2. This 
> effectively means that it can only pick colors of pixels at even coordinates 
> (in the absolute desktop space). So if the window is placed at, say, `(201, 
> 201)`, `Robot` can only pick the color at either `(200, 200)` or `(202, 
> 202)`. Since the test only makes sense if it is pixel-accurate, I removed all 
> `@run`s with `sun.java2d.uiScale` other than 1. This way window placement 
> will not cause a failure.
> 
> This was tested on Ubuntu 20.04 and 18.04 with desktop scaling set to 100%, 
> 200%, and 300%.

Maxim Kartashev has updated the pull request incrementally with one additional 
commit since the last revision:

  Reverted HiDPIRobotScreenCaptureTest back to 8280861 with minor changes

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7613/files
  - new: https://git.openjdk.java.net/jdk/pull/7613/files/e58cc949..f76fc4ee

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7613&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7613&range=03-04

  Stats: 42 lines in 1 file changed: 18 ins; 4 del; 20 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7613.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7613/head:pull/7613

PR: https://git.openjdk.java.net/jdk/pull/7613

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