L_SetOverlayAttributes

#include "l_bitmap.h"

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

pBITMAPHANDLE pBitmap;	/* pointer to the main bitmap handle */
L_INT nIndex;	/* the overlay index */
pOVERLAYATTRIBUTES pOverlayAttributes;	/* pointer to the overlay attributes structure */
L_UINT uFlags;	/* flags that determine which attributes should be set */

Sets the overlay attributes for the overlay at the specified index. This function is available in the Medical toolkits.

Parameter	Description
pBitmap	Pointer to the bitmap handle referencing the main bitmap.
nIndex	The index of the overlay for which the attributes are being set. This index is zero-based.
pOverlayAttributes	Structure containing the overlay attributes to set.
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

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

Windows 95 / 98 / Me, Windows 2000 / XP.

See Also

Functions:	L_ResampleBitmap, L_SizeBitmap, L_StartResize, L_Resize, L_StopResize, L_SetOverlayBitmap, L_GetOverlayBitmap, L_GetOverlayAttributes, L_UpdateBitmapOverlayBits, L_GetOverlayCount, OVERLAYATTRIBUTES, L_BricksTextureBitmap, L_CanvasBitmap, L_DisplaceMapBitmap, L_FragmentBitmap, L_VignetteBitmap
Topics:	Raster Image Functions: Combining Images
	Overlay Overview

Example

/* You can also see the example for 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_VOID ShowOverlays(HWND hWnd, pBITMAPHANDLE pBitmap, L_BOOL bShow)
{
   L_INT i;
   OVERLAYATTRIBUTES   OverlayAttributes;

   for(i = 0; i <= MAX_OVERLAYS; i++)
   {
      L_GetOverlayAttributes(pBitmap, i, &OverlayAttributes, sizeof(OverlayAttributes), OVERLAYATTRIBUTES_FLAGS);
      if(bShow)
         OverlayAttributes.uFlags |=  OVERLAY_AUTOPAINT;
      else
         OverlayAttributes.uFlags &= ~OVERLAY_AUTOPAINT;
      L_SetOverlayAttributes(pBitmap, i, &OverlayAttributes, OVERLAYATTRIBUTES_FLAGS);
   }

   InvalidateRect(hWnd, NULL, FALSE);
}