Comments on: What’s the resolution of your screen? http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen The personal weblog of Peter Hosey. Wed, 08 Oct 2008 07:00:13 +0000 http://wordpress.org/?v=2.5.1 By: Cristian Draghici http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-119217 Cristian Draghici Tue, 04 Sep 2007 06:14:01 +0000 http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-119217 In fact both CGDisplayScreenSize and kCGDisplayWidth from the dictionary created by IOCreateDisplayInfoDictionary are a bit off. In the sense that both return the physical size of the display but not the _lit_ size of the display. On my MacBook, they return 290 mm while the lit part of the display is in fact more like 285 mm. This means computing DPI/PPI will always be a bit off if you use CGDisplayScreenSize. In fact both CGDisplayScreenSize and kCGDisplayWidth from the dictionary created by IOCreateDisplayInfoDictionary are a bit off.
In the sense that both return the physical size of the display but not the _lit_ size of the display.

On my MacBook, they return 290 mm while the lit part of the display is in fact more like 285 mm.
This means computing DPI/PPI will always be a bit off if you use CGDisplayScreenSize.

]]> By: ssp http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-16105 ssp Wed, 28 Mar 2007 18:33:20 +0000 http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-16105 Interesting... Let's hope Apple manage to get this right at some stage. (I still remember being annoyed by Safari's change to a huge default font size when what they should have done was make the display respect the screen's resolution.) Interesting... Let's hope Apple manage to get this right at some stage.

(I still remember being annoyed by Safari's change to a huge default font size when what they should have done was make the display respect the screen's resolution.)

]]> By: Peter Hosey http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-14392 Peter Hosey Fri, 23 Mar 2007 00:51:37 +0000 http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-14392 An IOServicePort goes to I/O Kit. You'll need to make a connection to the port using that API. Beyond that, I don't know. An IOServicePort goes to I/O Kit. You'll need to make a connection to the port using that API. Beyond that, I don't know.

]]> By: Epalzeo http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-14379 Epalzeo Thu, 22 Mar 2007 22:47:42 +0000 http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-14379 Funny, i want to do the same thing :) I used the CGDisplayIOServicePort and get an handle io_service_t but i dont know how to deal with it. Have you found how ? Thanks, Epalzeo Funny, i want to do the same thing :)

I used the CGDisplayIOServicePort and get an handle io_service_t but i dont know how to deal with it.

Have you found how ?

Thanks,
Epalzeo

]]> By: Peter Hosey http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-7251 Peter Hosey Sun, 04 Feb 2007 18:20:00 +0000 http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-7251 Not in Quartz. I'd guess that you can use I/O Kit to do it, but I haven't looked hard enough to find it in the rather obtuse HeaderDoc “documentation” of I/O Kit. Starter tip: Quartz Display Services does let you get the I/O Kit service port for a display. Use <a href="http://developer.apple.com/documentation/GraphicsImaging/Reference/Quartz_Services_Ref/Reference/reference.html#//apple_ref/c/func/CGDisplayIOServicePort" rel="nofollow">CGDisplayIOServicePort</a>. Not in Quartz. I'd guess that you can use I/O Kit to do it, but I haven't looked hard enough to find it in the rather obtuse HeaderDoc “documentation” of I/O Kit.

Starter tip: Quartz Display Services does let you get the I/O Kit service port for a display. Use CGDisplayIOServicePort.

]]> By: Farhan http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-7250 Farhan Sun, 04 Feb 2007 18:16:44 +0000 http://boredzo.org/blog/archives/2007-02-04/whats-the-resolution-of-your-screen#comment-7250 Awesome find. I do have one question though. Is there a way to CG API (or any other API) that will let you turn of the display immediately? Like the Energy Saver setting that turn off the display after a certain time, but instead of fiddling with the ES setting every time, the display can be turned off immediately. Thanks, Farhan Awesome find. I do have one question though. Is there a way to CG API (or any other API) that will let you turn of the display immediately? Like the Energy Saver setting that turn off the display after a certain time, but instead of fiddling with the ES setting every time, the display can be turned off immediately.

Thanks,
Farhan

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