How to know, whether HiDPI is supported?

[Eirik Bakke]

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
>>