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Inside Macintosh: More Macintosh Toolbox /
Chapter 5 - Icon Utilities / Icon Utilities Reference
Icon Utilities Routines

Converting an Icon Mask to a Region

The IconSuiteToRgn, IconIDToRgn, and IconMethodToRgn functions create a region from an icon's mask. IconSuiteToRgn and IconIDToRgn operate on an icon identified by a handle to a suite and an icon ID, respectively. The IconMethodToRgn function performs this operation on the icon mask that it obtains with the aid of
your icon getter function. Once you have a region that describes the icon mask for a given icon, you can use it to perform accurate hit-testing and outline dragging of the icon in your application.

Subtopics
IconSuiteToRgn
IconIDToRgn
IconMethodToRgn
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