OVERLAYATTRIBUTES

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The OVERLAYATTRIBUTES structure contains overlay attributes. Each overlay is a 1-bit image. The attributes are stored as member variable or flags inside uFlags member.

Member	Data Type	Description
uStructSize	L_UINT	The size of the structure (use sizeof (OVERLAYATTRIBUTES) )
ptOrigin	POINT	Origin (top left point), in pixels, of the overlay bitmap, relative to the top left point of the displayed main bitmap. This is independent of the main bitmaps view perspective.
crColor	COLORREF	The color used to display those pixels in the overlay bitmap with a value of 1.
uFlags	L_UINT	One or more of the following flags:
		OVERLAY_AUTOPAINT	[0x00000001] Paint the overlay automatically when the bitmap is painted using LPaint::PaintDC functions.
		OVERLAY_AUTOPROCESS	[0x00000002] Automatically adjust the overlay bitmap and position when the main bitmap is resized (zoomed in), scrolled, rotated, flipped, reversed, sheared, trimmed.
		OVERLAY_USEBITPLANE	[0x00000004] the overlay has a corresponding bitplane in the main bitmap. uBitPosition is the index bitplane.
uBitPosition	L_UINT16	Corresponding bit plane associated with an overlay. Valid only if OVERLAY_USEBITPLANE is set in uFlags. For more information about the bit position, refer to "Overlay Plane Module Attributes" in the DICOM standard.
uRows	L_UINT16	Number of rows in the overlay. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
uColumns	L_UINT16	Number of columns in the overlay. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
szType	L_CHAR	A null-terminated string that indicates whether this overlay represents a region of interest or other graphics. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
uBitsAllocated	L_UINT16	Number of bits allocated in the overlay. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
szDescription	L_CHAR	NULL terminated string that contains user-defined comments about the overlay. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
szSubtype	L_CHAR	NULL terminated string that contains a defined term that identifies the intended purpose of the overlay type. For more information on possible values, refer to "Overlay Plane Module Attributes" in the DICOM standard.
szLabel	L_CHAR	NULL terminated string that contains user defined text, which may be used to label or name this overlay. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
nROIArea	L_INT32	Number of pixels in the Region Of Interest area. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
fROIMean	L_DOUBLE	Average value of the pixels in the Region Of Interest. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
fROIStandardDeviation	L_DOUBLE	The standard deviation of the pixel values in the Region Of Interest. For more information, refer to "Overlay Plane Module Attributes" in the DICOM standard.
nNumFramesInOverlay	L_INT32	Number of Frames in the overlay. For more information, refer to "Multi-frame Overlay Module Attributes" in the DICOM standard.
uImageFrameOrigin	L_UINT16	The number of the frame of a multi-frame image to which this overlay applies. For more information, refer to "Multi-frame Overlay Module Attributes" in the DICOM standard.
szActivationLayer	L_CHAR	NULL terminated string that identifies the layer in which the overlay shall be displayed. For more information, refer to "Overlay/Curve Activation Module Attributes" in the DICOM standard.