GreSaveXform

GreSaveXform is called during SaveDC and OpenDC to allow simulations to save their local data structures. A Save with a count of one more than the current save level generates intervening levels. When a new DC is created, GreSaveXform is called with a count of 1 to initialize its local data.

This function can be hooked by the presentation driver.


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

Syntax
GreSaveXform(hdc, cSave, pInstance, lFunction);

Parameters

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


 * cSave (LONG) - input
 * DC save level. This must not be a negative value.


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


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

Return Code

 * fSuccess (BOOL) - returns
 * Return codes.


 * This function returns BOOLEAN (fSuccess).
 * TRUE Successful
 * FALSE Error.


 * 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_HDC_BUSY
 * PMERR_INSUFFICIENT_MEMORY
 * PMERR_INV_HDC.


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

Remarks
When initializing a new DC, the default transform must be set.

Sample Code

 * 1) define INCL_GRE_XFORMS
 * 2) include 

HDC     hdc;        /*  Device context handle. */ LONG    cSave;      /*  DC save level. This must not be a negative value. */ PVOID   pInstance;  /*  Pointer to instance data. */ ULONG   lFunction;  /*  High-order WORD=flags; low-order WORD=NGreSaveXform. */ BOOL    fSuccess;   /*  Return codes. */

fSuccess = GreSaveXform(hdc, cSave, pInstance, lFunction); 