L_UINT uStructSize; 
   pBITMAPHANDLE pBitmap; 
   L_BOOL bZoomToFit; 
   L_INT nThreshold; 
   L_UINT uDim; 
   L_UINT uFilter; 
   L_UINT32 uDlgFlags; 
   LTCOMMDLGHELPCB pfnHelpCallback; 
   L_VOID *pHelpCallBackUserData; 

The ANTIALIASDLGPARAMS structure provides information used to initialize the dialog box created by the L_DlgAntiAlias 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 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)".
nThreshold Threshold value that indicates which pixels to smooth. The application of the anti-aliasing filter on the image associates a value with each pixel. Only pixels with values above this threshold are smoothed. Range of possible values are:
  If the image is: Unsigned Signed
  12-bit. 0-4095 -2048 to +2047
  16-bit, 48-bit, or 64-bit. 0-65535 -32768 to +32767
  Other bits per pixel. 0-255  
uDim Value that indicates the size of the anti-aliasing mask. This value represents the side of a square neighborhood. Possible values range from 2 - 100.
uFilter Flag that indicates the type of anti-aliasing filter to use. Possible values are:
  Value Meaning
  ANTIALIAS_1 [0x0000] Anti-alias the bitmap vertically and horizontally.
  ANTIALIAS_2 [0x0001] Anti-alias the bitmap in all directions.
  ANTIALIAS_3 [0x0002] Anti-alias the bitmap in all directions. The filter used for this option is different from the filter used for the ANTIALIAS_2 option.
  ANTIALIAS_DIAG [0x0003] Anti-alias the bitmap diagonally.
  ANTIALIAS_HORZ [0x0004] Anti-alias the bitmap horizontally.
  ANTIALIAS_VERT [0x0005] Anti-alias the bitmap vertically.
uDlgFlags User interface flags for this dialog, which determine the layout and action of the dialog. Possible values are:
  Value Meaning
  DLG_ANTIALIAS_AUTOPROCESS [0x00000001] process the image on OK. The pBitmap member of this structure should contain a valid bitmap.
  DLG_ANTIALIAS_SHOW_CONTEXTHELP [0x00000002] dialog should contain a context sensitive help icon.
  DLG_ANTIALIAS_SHOW_PREVIEW [0x00000004] show a preview of the image in the dialog. The pBitmap member of this structure should contain a valid bitmap.
  DLG_ANTIALIAS_SHOW_TOOL_ZOOMLEVEL [0x00000008] show the "Zoom to fit" and "Zoom Normal" toolbar buttons. The DLG_ANTIALIAS_SHOW_PREVIEW flag must be set in order to show these buttons.
  DLG_ANTIALIAS_SHOW_APPLY [0x00000080] Show the Apply button in the dialog. The dialog will not apply any effect unless the user presses the Apply button.
pfnHelpCallback Pointer to an optional help callback function. If you do not wish to provide help to this dialog, use NULL as the value of this parameter. To provide help to this dialog, use the function pointer as the value of this parameter. The callback function must adhere to the prototype described in LTCOMMDLGHELPCB.
pHelpCallBackUserData Void pointer that you can use to pass one or more additional parameters that the callback function needs. To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pHelpCallBackUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If the additional parameters are not needed, you can pass NULL in this parameter.
Help Version 20.0.2019.3.11
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LEADTOOLS Common Dialog C API Help