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 bitmap’s 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:

Value

Meaning

OVERLAY_AUTOPAINT

[0x00000001] Paint the overlay automatically when the bitmap is painted using the L_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.