PREWITTFILTERDLGPARAMS

typedef struct _PREWITTFILTERDLGPARAMS 
{ 
   L_UINT uStructSize; 
   pBITMAPHANDLE pBitmap; 
   L_BOOL bZoomToFit; 
   pSPATIALFLT pFilter; 
   L_UINT32 uDlgFlags; 
   LTCOMMDLGHELPCB pfnHelpCallback; 
   L_VOID  *pHelpCallBackUserData; 
} PREWITTFILTERDLGPARAMS,  * LPPREWITTFILTERDLGPARAMS;

The PREWITTFILTERDLGPARAMS structure provides information used to initialize the dialog box created by the LDialogImageEffect::DoModalPrewittFilter function. After the user closes the dialog box, this structure is updated with information about the user's selections.

Member Description
uStructSize Size of this structure, in bytes. Use the sizeof operator to calculate this value.
pBitmap Ignored.
bZoomToFit Flag that indicates the initial zoom level for previewing the image. Possible values are:
  Value Meaning
  TRUE Set the initial zoom level to "Zoom to fit".
  FALSE Set the initial zoom level to "Normal (1:1)".

 

pFilter Address of a variable to be updated with the spatial filter selected in the dialog. The Prewitt filter applies Prewitt edge detection. All pixels not on the detected edges are changed to black. (The usage is the same as Sobel, but the algorithm is different.) Choose the appropriate value for horizontal or vertical detection. Possible values are:
  Value
  FLT_PREWITT_HORZ
  FLT_PREWITT_VERT
uDlgFlags User interface flags for this dialog, which determine the layout and action of the dialog. Possible values are:
  Value Meaning
  DLG_PREWITTFILTER_SHOW_CONTEXTHELP [0x00000002] dialog should contain a context sensitive help icon.
pfnHelpCallback Ignored.
pHelpCallBackUserData Ignored.
Help Version 19.0.2017.10.27
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