GrePtInRegion

GrePtInRegion checks whether a point lies within a region. GrePtInRegion raises an error when hrgn is the handle of the currently selected clip region. The point is always expected in device coordinates.

This function can be hooked by the presentation driver.


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

Syntax
GrePtInRegion(hdc, hrgn, pptlPoint, pInstance, lFunction);

Parameters

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


 * hrgn (HRGN) - input
 * Region handle.


 * pptlPoint (PPOINTL) - input
 * Pointer to (x, y) point specified in device coordinates.


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


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

Return Code

 * rc (LONG) - returns
 * Return codes.


 * This function returns an integer (lInside) indicating whether the point is inside the region:


 * RGN_ERROR Error
 * PRGN_INSIDE In region
 * PRGN_OUTSIDE Not in region.


 * 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_COORDINATE
 * PMERR_INV_HRGN
 * PMERR_INV_RECT
 * PMERR_REGION_IS_CLIP_REGION


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

Declaration

 * 1) define INCL_GRE_REGIONS
 * 2) include 

HDC       hdc;        /*  Device context handle. */ HRGN      hrgn;       /*  Region handle. */ PPOINTL   pptlPoint;  /*  Pointer to (x, y) point specified in device coordinates. */ PVOID     pInstance;  /*  Pointer to instance data. */ ULONG     lFunction;  /*  High-order WORD=flags; low-order WORD=NGrePtInRegion. */ LONG      rc;         /*  Return codes. */

rc = GrePtInRegion(hdc, hrgn, pptlPoint, pInstance,      lFunction); 