Mailing Lists: Apple Mailing Lists
Image of Mac OS face in stamp
 
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: screenshot api?

On Nov 23, 2003, at 12:54 PM, Greg Robbins wrote:

That app seems to use CreateNewPort, assuming that the pixmap of that port points right to the screen (or main window, or whatever). Is that an undocumented hack then, or a feature?


It's the design of QuickDraw. By definition, the pixmap of every on-screen port points to the pixels of the main screen, no matter which screen that port is displayed on. The develop article "Multiple Screens Revealed" described it this way:

Strictly speaking, it's the design of QuickDraw on Mac OS 9. It happens to still be that way on X, but I don't think we've guaranteed that it will always remain that way. At some point in the future, the display buffer might not be in mappable memory (or so I've seen the CG guys say), and in that case, a generic port's PixMap may no longer give access to the screen buffer.

-eric
_______________________________________________
carbon-development mailing list | email@hidden
Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/carbon-development
Do not post admin requests to the list. They will be ignored.
References: 
 >screenshot api? (From: Kurt Sutter <email@hidden>)
 >Re: screenshot api? (From: Eric Schlegel <email@hidden>)
 >Re: screenshot api? (From: Kurt Sutter <email@hidden>)
 >Re: screenshot api? (From: Greg Robbins <email@hidden>)



Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2007 Apple Inc. All rights reserved.