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L_SetOverlayAttributes

Summary

Sets the overlay attributes for the overlay at the specified index.

Syntax

#include "l_bitmap.h"

L_LTKRN_API L_INT L_SetOverlayAttributes (pBitmap, nIndex, pOverlayAttributes, uFlags);

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle referencing the main bitmap.

L_INT nIndex

The index of the overlay for which the attributes are being set. This index is zero-based.

pOVERLAYATTRIBUTES pOverlayAttributes

Structure containing the overlay attributes to set.

L_UINT uFlags

Flags that determine which overlay attributes to set. You can or these flags. Possible values are:

Value	Meaning
OVERLAYATTRIBUTES_ORIGIN	[0x0001] The top-left position should be changed. pOverlayAttributes->ptOrigin contains the new top-left offset
OVERLAYATTRIBUTES_COLOR	[0x0002] Indicates the color should be changed. pOverlayAttributes->crColor contains the new color
OVERLAYATTRIBUTES_FLAGS	[0x0004] Indicates the flags should be changed. pOverlayAttributes->uFlags contains the new flags
OVERLAYATTRIBUTES_BITINDEX	[0x0008] Indicates the corresponding bitplane position should be changed. pOverlayAttributes->uBitPosition contains the new bitplane index.
OVERLAYATTRIBUTES_DICOM	[0x0010] Indicates that the DICOM-related attributes should be changed, this includes:
	pOverlayAttributes->uRows
	pOverlayAttributes->uColumns
	pOverlayAttributes->szType
	pOverlayAttributes->uBitsAllocated
	pOverlayAttributes->szDescription
	pOverlayAttributes->szSubtype
	pOverlayAttributes->szLabel
	pOverlayAttributes->nROIArea
	pOverlayAttributes->fROIMean
	pOverlayAttributes->fROIStandardDeviation
	pOverlayAttributes->nNumFramesInOverlay
	pOverlayAttributes->uImageFrameOrigin
	pOverlayAttributes->szActivationLayer

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function can be used to set some or all the overlay attributes. Before calling this function, initialize pOverlayAttributes->uStructSize to be sizeof(OVERLAYATTRIBUTES) and initialize all the attributes to be set or changed. You do not need to initialize the structure variables that you are not setting or changing. For example, if OVERLAYATTRIBUTES_ORIGIN is not set in uFlags, you do not need to initialize pOverlayAttributes-> ptOrigin.

There are several attributes in uFlags and you cannot change only one flag. If you want to change only one flag, you will first have to get all the flags and change only the flag you want. See the example for more information.

Required DLLs and Libraries

LTKRN
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64, Linux.

Example

For an example, refer to L_SetOverlayBitmap.
This example will change only one of the flag attributes for all the overlays.
Note that OverlayAttributes.uStructSize is not initialized directly. L_GetOverlayAttributes is initializing OverlayAttributes.uStructSize.

L_INT SetOverlayAttributesExample(HWND            hWnd, 
                                                  pBITMAPHANDLE   pBitmap, 
                                                  L_BOOL          bShow) 
{ 
   L_INT nRet; 
   L_INT             i; 
   OVERLAYATTRIBUTES OverlayAttributes; 
 
   for(i = 0; i < MAX_OVERLAYS; i++) 
   { 
      nRet = L_GetOverlayAttributes(pBitmap, i, &OverlayAttributes, sizeof(OverlayAttributes), OVERLAYATTRIBUTES_FLAGS); 
      if(nRet != SUCCESS) 
         return nRet; 
      if(bShow) 
         OverlayAttributes.uFlags |=  OVERLAY_AUTOPAINT; 
      else 
         OverlayAttributes.uFlags &= ~OVERLAY_AUTOPAINT; 
      nRet = L_SetOverlayAttributes(pBitmap, i, &OverlayAttributes, OVERLAYATTRIBUTES_FLAGS); 
      if(nRet != SUCCESS) 
         return nRet; 
   } 
 
   InvalidateRect(hWnd, NULL, FALSE); 
   return SUCCESS; 
}