DDOVERLAYFX

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DDCOLORKEY
{
    public uint dwColorSpaceLowValue;
    public uint dwColorSpaceHighValue;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DDOVERLAYFX
{
    public uint dwSize;
    public uint dwAlphaEdgeBlendBitDepth;
    public uint dwAlphaEdgeBlend;
    public uint dwReserved;
    public uint dwAlphaDestConstBitDepth;
    public _Anonymous1_e__Union Anonymous1;
    public uint dwAlphaSrcConstBitDepth;
    public _Anonymous2_e__Union Anonymous2;
    public DDCOLORKEY dckDestColorkey;
    public DDCOLORKEY dckSrcColorkey;
    public uint dwDDFX;
    public uint dwFlags;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure DDCOLORKEY
    Public dwColorSpaceLowValue As UInteger
    Public dwColorSpaceHighValue As UInteger
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure DDOVERLAYFX
    Public dwSize As UInteger
    Public dwAlphaEdgeBlendBitDepth As UInteger
    Public dwAlphaEdgeBlend As UInteger
    Public dwReserved As UInteger
    Public dwAlphaDestConstBitDepth As UInteger
    Public Anonymous1 As _Anonymous1_e__Union
    Public dwAlphaSrcConstBitDepth As UInteger
    Public Anonymous2 As _Anonymous2_e__Union
    Public dckDestColorkey As DDCOLORKEY
    Public dckSrcColorkey As DDCOLORKEY
    Public dwDDFX As UInteger
    Public dwFlags As UInteger
End Structure

import ctypes
from ctypes import wintypes

class DDCOLORKEY(ctypes.Structure):
    _fields_ = [
        ("dwColorSpaceLowValue", wintypes.DWORD),
        ("dwColorSpaceHighValue", wintypes.DWORD),
    ]

class DDOVERLAYFX(ctypes.Structure):
    _fields_ = [
        ("dwSize", wintypes.DWORD),
        ("dwAlphaEdgeBlendBitDepth", wintypes.DWORD),
        ("dwAlphaEdgeBlend", wintypes.DWORD),
        ("dwReserved", wintypes.DWORD),
        ("dwAlphaDestConstBitDepth", wintypes.DWORD),
        ("Anonymous1", _Anonymous1_e__Union),
        ("dwAlphaSrcConstBitDepth", wintypes.DWORD),
        ("Anonymous2", _Anonymous2_e__Union),
        ("dckDestColorkey", DDCOLORKEY),
        ("dckSrcColorkey", DDCOLORKEY),
        ("dwDDFX", wintypes.DWORD),
        ("dwFlags", wintypes.DWORD),
    ]

#[repr(C)]
pub struct DDCOLORKEY {
    pub dwColorSpaceLowValue: u32,
    pub dwColorSpaceHighValue: u32,
}

#[repr(C)]
pub struct DDOVERLAYFX {
    pub dwSize: u32,
    pub dwAlphaEdgeBlendBitDepth: u32,
    pub dwAlphaEdgeBlend: u32,
    pub dwReserved: u32,
    pub dwAlphaDestConstBitDepth: u32,
    pub Anonymous1: _Anonymous1_e__Union,
    pub dwAlphaSrcConstBitDepth: u32,
    pub Anonymous2: _Anonymous2_e__Union,
    pub dckDestColorkey: DDCOLORKEY,
    pub dckSrcColorkey: DDCOLORKEY,
    pub dwDDFX: u32,
    pub dwFlags: u32,
}

import "golang.org/x/sys/windows"

type DDCOLORKEY struct {
	dwColorSpaceLowValue uint32
	dwColorSpaceHighValue uint32
}

type DDOVERLAYFX struct {
	dwSize uint32
	dwAlphaEdgeBlendBitDepth uint32
	dwAlphaEdgeBlend uint32
	dwReserved uint32
	dwAlphaDestConstBitDepth uint32
	Anonymous1 _Anonymous1_e__Union
	dwAlphaSrcConstBitDepth uint32
	Anonymous2 _Anonymous2_e__Union
	dckDestColorkey DDCOLORKEY
	dckSrcColorkey DDCOLORKEY
	dwDDFX uint32
	dwFlags uint32
}

type
  DDCOLORKEY = record
    dwColorSpaceLowValue: DWORD;
    dwColorSpaceHighValue: DWORD;
  end;

  DDOVERLAYFX = record
    dwSize: DWORD;
    dwAlphaEdgeBlendBitDepth: DWORD;
    dwAlphaEdgeBlend: DWORD;
    dwReserved: DWORD;
    dwAlphaDestConstBitDepth: DWORD;
    Anonymous1: _Anonymous1_e__Union;
    dwAlphaSrcConstBitDepth: DWORD;
    Anonymous2: _Anonymous2_e__Union;
    dckDestColorkey: DDCOLORKEY;
    dckSrcColorkey: DDCOLORKEY;
    dwDDFX: DWORD;
    dwFlags: DWORD;
  end;

const DDCOLORKEY = extern struct {
    dwColorSpaceLowValue: u32,
    dwColorSpaceHighValue: u32,
};

const DDOVERLAYFX = extern struct {
    dwSize: u32,
    dwAlphaEdgeBlendBitDepth: u32,
    dwAlphaEdgeBlend: u32,
    dwReserved: u32,
    dwAlphaDestConstBitDepth: u32,
    Anonymous1: _Anonymous1_e__Union,
    dwAlphaSrcConstBitDepth: u32,
    Anonymous2: _Anonymous2_e__Union,
    dckDestColorkey: DDCOLORKEY,
    dckSrcColorkey: DDCOLORKEY,
    dwDDFX: u32,
    dwFlags: u32,
};

type
  DDCOLORKEY {.bycopy.} = object
    dwColorSpaceLowValue: uint32
    dwColorSpaceHighValue: uint32

  DDOVERLAYFX {.bycopy.} = object
    dwSize: uint32
    dwAlphaEdgeBlendBitDepth: uint32
    dwAlphaEdgeBlend: uint32
    dwReserved: uint32
    dwAlphaDestConstBitDepth: uint32
    Anonymous1: _Anonymous1_e__Union
    dwAlphaSrcConstBitDepth: uint32
    Anonymous2: _Anonymous2_e__Union
    dckDestColorkey: DDCOLORKEY
    dckSrcColorkey: DDCOLORKEY
    dwDDFX: uint32
    dwFlags: uint32

struct DDCOLORKEY
{
    uint dwColorSpaceLowValue;
    uint dwColorSpaceHighValue;
}

struct DDOVERLAYFX
{
    uint dwSize;
    uint dwAlphaEdgeBlendBitDepth;
    uint dwAlphaEdgeBlend;
    uint dwReserved;
    uint dwAlphaDestConstBitDepth;
    _Anonymous1_e__Union Anonymous1;
    uint dwAlphaSrcConstBitDepth;
    _Anonymous2_e__Union Anonymous2;
    DDCOLORKEY dckDestColorkey;
    DDCOLORKEY dckSrcColorkey;
    uint dwDDFX;
    uint dwFlags;
}