> On Jun 29, 2017, at 2:40 PM, Martin Crane <[email protected]> wrote:
>
>
>> On 29 Jun 2017, at 22:27, James Walker <[email protected]> wrote:
>>
>> On 6/29/2017 12:59 AM, Martin Crane wrote:
>>> James, as the author of such an app I can tell you that it’s definitely
>>> worthwhile overall. For the most part, everything "just works" in HiDPI
>>> mode, with some exceptions. It’s certainly a huge improvement on the
>>> low-res pixelated look on retina Macs :)
>>>
>>> If you get stuck and need some pointers I’ll be happy to help.
>>
>> Since you kindly offered... what's the deal with kHICoordSpace72DPIGlobal
>> and kHICoordSpaceScreenPixel? I thought it would start making a difference
>> which of these I use once I go to HiDPI. But at least when calling
>> HIWindowGetBounds to get the structure or content region of a HiDPI Carbon
>> window, I get the same result either way.
>>
>
> I don’t use either of those in my entire app, but you’ll find that
> HIGetScaleFactor always returns 1.0, which explains why there is no
> difference in the two.
That’s strange, but it simplifies my life if I don’t have to think about which
to use.
> If you’re looking to find a way to pragmatically determine whether your app
> is running in HiDPI mode, the only way I discovered is something like below,
> from which I cache the result.
I don’t know how useful it would be to test whether an app is running in HiDPI
mode, since a particular Carbon window may or may not have framework scaling
enabled. Given a Carbon window, you can find out using
HIWindowGetBackingScaleFactor. (In Cocoa, there is an NSWindow property
backingScaleFactor.)
>
> -Martin
>
>
> CGContextRef browserContext = 0;
> WindowRef testWind;
> Rect r = {0,0,600,600};
> Boolean isRetina = false;
>
> CreateNewWindow(kDocumentWindowClass,kWindowCompositingAttribute |
> kWindowFrameworkScaledAttribute, &r, &testWind);
>
> if (testWind)
> {
> CreateCGContextForPort(GetWindowPort(testWind),&browserContext);
>
> if (browserContext)
> {
> CGRect deviceRect, userRect;
>
> userRect = CGRectMake( 0, 0, 128, 128 );
>
> deviceRect =
> CGContextConvertRectToDeviceSpace(browserContext, userRect);
>
> if (!CGRectEqualToRect(deviceRect, userRect))
> {
> float scaleFactor = deviceRect.size.height /
> userRect.size.height;
>
> if (scaleFactor != 1.0)
> isRetina = true;
> }
>
> CGContextRelease(browserContext);
> }
>
> DisposeWindow(testWind);
> }
>
> return isRetina;
>
>
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