Re: Quartz Display Services & Retina Display Modes
Re: Quartz Display Services & Retina Display Modes
- Subject: Re: Quartz Display Services & Retina Display Modes
- From: Matthias Dörfelt <email@hidden>
- Date: Tue, 20 May 2014 01:03:53 -0700
Thanks, that does exactly what I want. The naming of kCGDisplayShowDuplicateLowResolutionModes seems is very confusing and ambiguous to me, though.
Thanks for the help!
Matthias
Am 20.05.2014 um 00:32 schrieb Ken Thomases <email@hidden>:
> On May 20, 2014, at 1:59 AM, Matthias Dörfelt wrote:
>
>> AFAIK there is no way to find retina display modes with Quartz Display Services right now. Why is that? Is there any workaround or different API?
>> Right now, if I change the Display Mode of my retina display programmatically, I have to cache the original retina display mode in order to return to it, as
>> CGDisplayCopyAllDisplayModes won’t expose them to me.
>> Are we still waiting for a proper public API to handle these things or am I fundamentally misunderstanding something here?
>
> It's not that you're misunderstanding, it's that the new capability has not been documented well. It's only listed in the headers.
>
> In /System/Library/Frameworks/CoreGraphics.framework/Versions/A/Headers/CGDirectDisplay.h you'll find the declaration of kCGDisplayShowDuplicateLowResolutionModes. That's a key that can be used in the options dictionary parameter of CGDisplayCopyAllDisplayModes(). Use the value kCFBooleanTrue.
>
> There are also new functions to get the dimensions of a display mode in pixels rather than points: CGDisplayModeGetPixelWidth() and CGDisplayModeGetPixelHeight(). Without these, you may mistake a HiDPI display mode as a normal one, since its dimensions will be reported in points.
>
>
> For what it's worth, I found that the old, deprecated display mode APIs (e.g. CGDisplayAvailableModes()) list all of the display modes with no special flags or options.
>
> Regards,
> Ken
>
>
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