On Wed, 16 Mar 2022 07:41:32 GMT, Maxim Kartashev <d...@openjdk.java.net> wrote:
>> 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 Marked as reviewed by aivanov (Reviewer). ------------- PR: https://git.openjdk.java.net/jdk/pull/7613
