GreEqualRegion

GreEqualRegion checks whether two regions, owned by the device that is identified by hdc, are identical. An error is raised when either region is currently selected as the clip region.

This function can be hooked by the presentation driver.


 * Simulation support: This function is simulated by a handling routine in the graphics engine.

Syntax
GreEqualRegion(hdc, hrgnSrc1, hrgnSrc2, pInstance, lFunction);

Parameters

 * hdc (HDC) - input
 * Device context handle.


 * hrgnSrc1 (HRGN) - input
 * First region handle.


 * hrgnSrc2 (HRGN) - input
 * Second region handle.


 * pInstance (PVOID) - input
 * Pointer to instance data.


 * lFunction (ULONG) - input
 * High-order WORD=flags; low-order WORD=NGreEqualRegion.

Returns

 * rc (LONG) - returns
 * Return codes.


 * This function returns an integer (lEquality) indicating whether the regions are equal:


 * EQRGN_EQUAL Equal
 * EQRGN_ERROR Error
 * EQRGN_NOTEQUAL Not equal


 * Possible Errors Detected: When an error is detected, the handling routine must call WinSetErrorInfo to post the condition. Error codes for conditions that the handling routine is expected to check include:


 * PMERR_HRGN_BUSY
 * PMERR_INV_HRGN
 * PMERR_REGION_IS_CLIP_REGION


 * Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.

Sample

 * 1) define INCL_GRE_REGIONS
 * 2) include 

HDC     hdc;        /*  Device context handle. */ HRGN    hrgnSrc1;   /*  First region handle. */ HRGN    hrgnSrc2;   /*  Second region handle. */ PVOID   pInstance;  /*  Pointer to instance data. */ ULONG   lFunction;  /*  High-order WORD=flags; low-order WORD=NGreEqualRegion. */ LONG    rc;         /*  Return codes. */

rc = GreEqualRegion(hdc, hrgnSrc1, hrgnSrc2,      pInstance, lFunction);