On Jun 29, 2011, at 1:04 PM, Richard Somers wrote:
> In System Preferences a user may select a specific display resolution.
> Some display resolutions will stretch the visible area to fill the display as needed. But some display resolutions will pillarbox where a black bar is placed on the left and right of the visible area.
> Is it possible to programmatically detect when the current display resolution is letterboxing or pillarboxing?
No, because that's up the monitor to decide what to do when that happens. For example, if the user has a 16:10 aspect ratio monitor and sets the resolution to 1080p instead of 1200p, then some monitors will stretch the image vertically, some will preserve the aspect ratio by letterboxing the image, and some will have a setting that lets the user decide how to handle the situation*. Unless the user is using one of Apple's built-in laptop displays, which always stretch the image IIRC, you can't count on this being set one way or the other.
* Yes, this is a wedge issue for a lot of people...
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