GreGetWindowViewportXform

GreGetWindowViewportXform queries the current window or viewport transform matrix. On completion, paXformData is an array of two-dimensional values defining the current window or viewport transform matrix.

This function can be hooked by the presentation driver.


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

Syntax
GreGetWindowViewportXform(hdc,paXformData, pInstance, lFunction)

Parameters

 * hdc (HDC) - input:Device context handle.
 * paXformData (PXFORM) - input:Pointer to return data.
 * Pointer to return data in which the array of six matrix elements (M11, M12, M21, M22, M41, and M42) are to be stored.


 * pInstance (PVOID) - input:Pointer to instance data.
 * lFunction (ULONG) - input:High-order WORD=flags; low-order WORD=NGreGetWindowViewportXform.

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

Declaration

 * 1) define INCL_GRE_XFORMS
 * 2) include 

HDC      hdc;         /* Device context handle. */ PXFORM   paXformData; /* Pointer to return data. */ PVOID    pInstance;   /* Pointer to instance data. */ ULONG    lFunction;   /* High-order WORD=flags; low-order WORD=NGreGetWindowViewportXform. */ BOOL     fSuccess;    /* Return codes. */

fSuccess = GreGetWindowViewportXform(hdc, paXformData, pInstance, lFunction); 