D2D1_LAYER_PARAMETERS

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct D2D_RECT_F
{
    public float left;
    public float top;
    public float right;
    public float bottom;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct D2D_MATRIX_3X2_F
{
    public _Anonymous_e__Union Anonymous;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct D2D1_LAYER_PARAMETERS
{
    public D2D_RECT_F contentBounds;
    public IntPtr geometricMask;
    public int maskAntialiasMode;
    public D2D_MATRIX_3X2_F maskTransform;
    public float opacity;
    public IntPtr opacityBrush;
    public int layerOptions;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure D2D_RECT_F
    Public left As Single
    Public top As Single
    Public right As Single
    Public bottom As Single
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure D2D_MATRIX_3X2_F
    Public Anonymous As _Anonymous_e__Union
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure D2D1_LAYER_PARAMETERS
    Public contentBounds As D2D_RECT_F
    Public geometricMask As IntPtr
    Public maskAntialiasMode As Integer
    Public maskTransform As D2D_MATRIX_3X2_F
    Public opacity As Single
    Public opacityBrush As IntPtr
    Public layerOptions As Integer
End Structure

import ctypes
from ctypes import wintypes

class D2D_RECT_F(ctypes.Structure):
    _fields_ = [
        ("left", ctypes.c_float),
        ("top", ctypes.c_float),
        ("right", ctypes.c_float),
        ("bottom", ctypes.c_float),
    ]

class D2D_MATRIX_3X2_F(ctypes.Structure):
    _fields_ = [
        ("Anonymous", _Anonymous_e__Union),
    ]

class D2D1_LAYER_PARAMETERS(ctypes.Structure):
    _fields_ = [
        ("contentBounds", D2D_RECT_F),
        ("geometricMask", ctypes.c_void_p),
        ("maskAntialiasMode", ctypes.c_int),
        ("maskTransform", D2D_MATRIX_3X2_F),
        ("opacity", ctypes.c_float),
        ("opacityBrush", ctypes.c_void_p),
        ("layerOptions", ctypes.c_int),
    ]

#[repr(C)]
pub struct D2D_RECT_F {
    pub left: f32,
    pub top: f32,
    pub right: f32,
    pub bottom: f32,
}

#[repr(C)]
pub struct D2D_MATRIX_3X2_F {
    pub Anonymous: _Anonymous_e__Union,
}

#[repr(C)]
pub struct D2D1_LAYER_PARAMETERS {
    pub contentBounds: D2D_RECT_F,
    pub geometricMask: *mut core::ffi::c_void,
    pub maskAntialiasMode: i32,
    pub maskTransform: D2D_MATRIX_3X2_F,
    pub opacity: f32,
    pub opacityBrush: *mut core::ffi::c_void,
    pub layerOptions: i32,
}

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

type D2D_RECT_F struct {
	left float32
	top float32
	right float32
	bottom float32
}

type D2D_MATRIX_3X2_F struct {
	Anonymous _Anonymous_e__Union
}

type D2D1_LAYER_PARAMETERS struct {
	contentBounds D2D_RECT_F
	geometricMask uintptr
	maskAntialiasMode int32
	maskTransform D2D_MATRIX_3X2_F
	opacity float32
	opacityBrush uintptr
	layerOptions int32
}

type
  D2D_RECT_F = record
    left: Single;
    top: Single;
    right: Single;
    bottom: Single;
  end;

  D2D_MATRIX_3X2_F = record
    Anonymous: _Anonymous_e__Union;
  end;

  D2D1_LAYER_PARAMETERS = record
    contentBounds: D2D_RECT_F;
    geometricMask: Pointer;
    maskAntialiasMode: Integer;
    maskTransform: D2D_MATRIX_3X2_F;
    opacity: Single;
    opacityBrush: Pointer;
    layerOptions: Integer;
  end;

const D2D_RECT_F = extern struct {
    left: f32,
    top: f32,
    right: f32,
    bottom: f32,
};

const D2D_MATRIX_3X2_F = extern struct {
    Anonymous: _Anonymous_e__Union,
};

const D2D1_LAYER_PARAMETERS = extern struct {
    contentBounds: D2D_RECT_F,
    geometricMask: ?*anyopaque,
    maskAntialiasMode: i32,
    maskTransform: D2D_MATRIX_3X2_F,
    opacity: f32,
    opacityBrush: ?*anyopaque,
    layerOptions: i32,
};

type
  D2D_RECT_F {.bycopy.} = object
    left: float32
    top: float32
    right: float32
    bottom: float32

  D2D_MATRIX_3X2_F {.bycopy.} = object
    Anonymous: _Anonymous_e__Union

  D2D1_LAYER_PARAMETERS {.bycopy.} = object
    contentBounds: D2D_RECT_F
    geometricMask: pointer
    maskAntialiasMode: int32
    maskTransform: D2D_MATRIX_3X2_F
    opacity: float32
    opacityBrush: pointer
    layerOptions: int32

struct D2D_RECT_F
{
    float left;
    float top;
    float right;
    float bottom;
}

struct D2D_MATRIX_3X2_F
{
    _Anonymous_e__Union Anonymous;
}

struct D2D1_LAYER_PARAMETERS
{
    D2D_RECT_F contentBounds;
    void* geometricMask;
    int maskAntialiasMode;
    D2D_MATRIX_3X2_F maskTransform;
    float opacity;
    void* opacityBrush;
    int layerOptions;
}