Drawing3d documented Class Library

FeaturesW32.PIXELFORMATDESCRIPTOR.dwVisibleMask Field

Specifies the transparent color or index of an underlay plane. When the pixel type is RGBA, dwVisibleMask is a transparent RGB color value. When the pixel type is color index, it is a transparent index value.

[Visual Basic]
Public dwVisibleMask As Integer
[C#]
public int dwVisibleMask;

See Also

PIXELFORMATDESCRIPTOR Class | Drawing3d.OS.Windows Namespace