## Display Device Driver Reference for OS/2

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### GreGetScreenChangeArea

Description:

GreGetScreenChangeArea takes an SCA handle and, for the identified SCA, adds its rectangles to the region pointed to by the phrgn field. The SCA is reset to NULL as a result of this call.

Parameters:

HDC hdc
HSCA hsca
PHRGN phrgn
PDC pdcArg
ULONG FunN
Refer to the chapter regarding mandatory and simulated graphics engine functions in the OS/2 Presentation Device Driver Reference for details on this function.