BUG: NSWindow -setFrame:display: can't use non-integral values

Number:rdar://11978869 Date Originated:
Status:Open Resolved:
Product:Mac OS X Product Version:12A269
Classification:Serious Bug Reproducible:Always

A window's frame can only be set with full points. Setting a half-point value for the window's origin causes the next lowest integral value to be used. Setting a half-point value for the size causes the next highest integral value to be used.

Steps to Reproduce:

1) Create an NSWindow.
2) Call -setFrame:display: using an NSRect with non-integral values.

(See the attached sample application)

Expected Results:

The window's position should be set to non-integral values.

In the sample application running on a Retina display, the window's x origin should move one pixel and it's width should grow by one pixel.

Actual Results:

The window's position is set to integral values.

The sample application's window origin does not change and it's size grows by two pixels.


Prior to a Retina display, there was no need to align windows with non-integral values.


Setting the position to non-integral values is very useful if an application is using a secondary NSWindow as a callout/overlay for another NSWindow that contains high resolution imagery. The secondary window can't be aligned perfectly.



The sample project can be downloaded from: http://files.iconfactory.net/craig/bugs/Retanal.zip

By craig.hockenberry at July 28, 2012, 12:32 a.m. (reply...)

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