Headless glass platform

[Andy Goryachev]

Excellent development, Johan, thank you!

I’ve asked a few questions in the ticket https://bugs.openjdk.org/browse/JDK-8324941

I suppose I should also do it here:

- How do you get information on a (virtual) screen?
- How would one control how many virtual screens are there?
- Would there be any other way of simulating user input apart from Robot?
- Is the graphics still accelerated?
- Are there any functional gaps between Headless and headful modes (fonts, rendering, etc.)?

Most importantly,
- Is there a JEP/tutorial for the new mode?

Thank you
-andy


From: openjfx-dev <openjfx-dev-retn at openjdk.org> on behalf of Johan Vos <johan.vos at gluonhq.com>
Date: Tuesday, January 30, 2024 at 03:47
To: openjfx-dev <openjfx-dev at openjdk.org>
Subject: Headless glass platform
Hi,

I created a branch in the jfx-sandbox repository for experimenting with a headless glass platform: https://github.com/openjdk/jfx-sandbox/tree/johanvos-headless

This addresses https://bugs.openjdk.org/browse/JDK-8324941 where I suggest a POC for a Headless platform.

There are a number of usecases for this, including:
1. applications that require JavaFX rendering without presenting this to a window (and instead send it to a printer for example)
2. running tests without requiring a window manager.

Regarding the second usecase, we already did some basic experiments using a modified version of TestFX where instead of the Monocle Headless subplatform, the POC Headless platform is used.

By using a first-class Headless glass platform instead of a Monocle subplatform, it should be easier to use by developers.
The monocle code contains very platform/os specific parts, which often don't make sense outside the target platform. This is very valuable, but it is also a very different usecase than a headless platform and it requires a much more complex build procedure.

I added an initial, limited HeadlessRobot to do some basic tests. That code is mainly taken from the existing Monocle implementation, but I want to be careful to avoid anything that is not applicable to the headless scenarios.

- Johan

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