On Tue, Jan 30, 2024 at 5:14 PM Andy Goryachev <andy.goryac...@oracle.com> wrote:
> 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? > Good questions. This is currently hardcoded in HeadlessApplication.staticScreen_getScreens() but that can be extended to take input via environment variables or System properties. > - Would there be any other way of simulating user input apart from Robot? > Not sure I understand the question. In theory, input with mouse etc would be possible but then that would be sort of a duplication/rewrite of the Robot. I'm missing the usecase for this I guess? > - Is the graphics still accelerated? > Yes, the headless platform does not influence the prism settings. If will still use the hw acceleration by default, and fall back to sw-rendering if hw fails, or if prism.order is set to explicitly use sw rendering. > - Are there any functional gaps between Headless and headful modes (fonts, > rendering, etc.)? > Not as far as I know, as that functionality is not in Glass. > > Most importantly, > - Is there a JEP/tutorial for the new mode? > > > > Thank you > > -andy > > > > > > *From: *openjfx-dev <openjfx-dev-r...@openjdk.org> on behalf of Johan Vos > <johan....@gluonhq.com> > *Date: *Tuesday, January 30, 2024 at 03:47 > *To: *openjfx-dev <openjfx-dev@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 > > >
