How to know, whether HiDPI is supported?

[Robert Krüger]

Yes, that's what I mean. On my Macbook Pro I can choose out of five
settings if I choose "scaled" rather than "best for retina display"
and I, for example, use the "more space" setting to have a maximum
resolution in terms of pixels and I doubt this is 2.0, so your check
would probably fail although it would make sense to use the
higher-resolution graphics on my Macbook with that setting. I would
probably just treat anything thats > 1.0 as HiDPI.

Robert

On Sat, Nov 30, 2013 at 8:09 PM, Eirik Bakke <ebakke at mit.edu> wrote:
> Quite possible--do you mean if the scale factor is not exactly 1.0 or 2.0?
> In that case, yes, you should need to get the actual scale factor from the
> AffineTransform. But I'm unsure how often scale factors other than 1.0 or
> 2.0 are encountered (surely there can't be more than two sets of icons for
> every app... unless everyone provides bitmap for the low resolution and
> SVG for the higher ones).
>
> I should add that I have only tested the Retina mode using the "Enable
> HiDPI display modes" option from the Graphics Tools for XCode [1]. And
> that one only lets me try 2x scale factors.
>
> -- Eirik
>
> [1]
> http://stackoverflow.com/questions/12124576/how-to-simulate-a-retina-displa
> y-hidpi-mode-in-mac-os-x-10-8-mountain-lion-on
>
> -- Eirik
>
> On 11/30/13, 7:04 AM, "Robert Krüger" <krueger at lesspain.de> wrote:
>
>>Don't the scale factors depend on the individual user's retina
>>settings? Of course, your approach will also work if that is the case,
>>it will just require some more checks.
>>
>>On Fri, Nov 29, 2013 at 11:26 PM, Eirik Bakke <ebakke at mit.edu> wrote:
>>> This did the trick for me:
>>>
>>> // g is the Graphics2D object fed to the paint() or paintComponent()
>>> method of your Swing component.
>>>
>>>g.getFontRenderContext().getTransform().equals(AffineTransform.getScaleIn
>>>st
>>> ance(2.0, 2.0))
>>>
>>>
>>> It uses no private APIs, and has the advantage that it lets you make the
>>> retina-or-not decision on a component-to-component basis (or in
>>>practice,
>>> on a window-to-window basis, as all components in the same window have
>>>the
>>> same FontRenderContext). This means if your user has one window on their
>>> retina laptop screen and another on their non-retina external monitor,
>>> both will render appropriately for their respective devices (I've
>>> confirmed this to work on Java 1.7.0_45 for MacOS X 10.8.5).
>>>
>>> -- Eirik
>>>
>>> On 11/29/13, 7:36 AM, "Hendrik Schreiber" <hs at tagtraum.com> wrote:
>>>
>>>>Hey..
>>>>
>>>>with some of the Retina work appearing in 1.7.0_60, what is the
>>>>recommended way for the developer to find out, whether images are/can be
>>>>scaled, i.e., whether we are dealing with a HiDPI display.
>>>>
>>>>In the past, on the Apple JVM, we used:
>>>>
>>>>       final Float scaleFactor = (Float)
>>>>Toolkit.getDefaultToolkit().getDesktopProperty("apple.awt.contentScaleFa
>>>>ct
>>>>or");
>>>>
>>>>Is there an equivalent?
>>>>
>>>>I very much appreciate that you are pushing some of the work down to
>>>>1.7.0_60. Can you say what parts should now/soon work and how to use
>>>>them?
>>>>
>>>>Thank you,
>>>>
>>>>-hendrik
>>>
>