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.

Members

uStructSize

Size of this structure, in bytes. Use the sizeof operator to calculate this value.

pBitmap

Pointer to the bitmap handle that references the bitmap used for preview or processing.

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:

uDlgFlags

User interface flags for this dialog, which determine the layout and action of the dialog. Possible values are:

Value Meaning
DLG_PREWITTFILTER_AUTOPROCESS [0x00000001] process the image on OK. The pBitmap member of this structure should contain a valid bitmap.
DLG_PREWITTFILTER_SHOW_CONTEXTHELP [0x00000002] dialog should contain a context sensitive help icon.
DLG_PREWITTFILTER_SHOW_PREVIEW [0x00000004] show a preview of the image in the dialog. The pBitmap member of this structure should contain a valid bitmap.
DLG_PREWITTFILTER_SHOW_TOOL_ZOOMLEVEL [0x00000008] show the "Zoom to fit" and "Zoom Normal" toolbar buttons. The DLG_PREWITTFILTER_SHOW_PREVIEW flag must be set in order to show these buttons.

pfnHelpCallback

Ignored.

pHelpCallBackUserData

Ignored.

Help Version 20.0.2019.9.19
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