EngAlphaBlend

// GDI32.dll
#include <windows.h>

BOOL EngAlphaBlend(
    SURFOBJ* psoDest,
    SURFOBJ* psoSrc,
    CLIPOBJ* pco,
    XLATEOBJ* pxlo,
    RECTL* prclDest,
    RECTL* prclSrc,
    BLENDOBJ* pBlendObj
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function EngAlphaBlend(
    psoDest As IntPtr,   ' SURFOBJ* in/out
    psoSrc As IntPtr,   ' SURFOBJ* in/out
    pco As IntPtr,   ' CLIPOBJ* in/out
    pxlo As IntPtr,   ' XLATEOBJ* in/out
    prclDest As IntPtr,   ' RECTL* in/out
    prclSrc As IntPtr,   ' RECTL* in/out
    pBlendObj As IntPtr   ' BLENDOBJ* in/out
) As Boolean
End Function

' psoDest : SURFOBJ* in/out
' psoSrc : SURFOBJ* in/out
' pco : CLIPOBJ* in/out
' pxlo : XLATEOBJ* in/out
' prclDest : RECTL* in/out
' prclSrc : RECTL* in/out
' pBlendObj : BLENDOBJ* in/out
Declare PtrSafe Function EngAlphaBlend Lib "gdi32" ( _
    ByVal psoDest As LongPtr, _
    ByVal psoSrc As LongPtr, _
    ByVal pco As LongPtr, _
    ByVal pxlo As LongPtr, _
    ByVal prclDest As LongPtr, _
    ByVal prclSrc As LongPtr, _
    ByVal pBlendObj As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

EngAlphaBlend = ctypes.windll.gdi32.EngAlphaBlend
EngAlphaBlend.restype = wintypes.BOOL
EngAlphaBlend.argtypes = [
    ctypes.c_void_p,  # psoDest : SURFOBJ* in/out
    ctypes.c_void_p,  # psoSrc : SURFOBJ* in/out
    ctypes.c_void_p,  # pco : CLIPOBJ* in/out
    ctypes.c_void_p,  # pxlo : XLATEOBJ* in/out
    ctypes.c_void_p,  # prclDest : RECTL* in/out
    ctypes.c_void_p,  # prclSrc : RECTL* in/out
    ctypes.c_void_p,  # pBlendObj : BLENDOBJ* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
EngAlphaBlend = Fiddle::Function.new(
  lib['EngAlphaBlend'],
  [
    Fiddle::TYPE_VOIDP,  # psoDest : SURFOBJ* in/out
    Fiddle::TYPE_VOIDP,  # psoSrc : SURFOBJ* in/out
    Fiddle::TYPE_VOIDP,  # pco : CLIPOBJ* in/out
    Fiddle::TYPE_VOIDP,  # pxlo : XLATEOBJ* in/out
    Fiddle::TYPE_VOIDP,  # prclDest : RECTL* in/out
    Fiddle::TYPE_VOIDP,  # prclSrc : RECTL* in/out
    Fiddle::TYPE_VOIDP,  # pBlendObj : BLENDOBJ* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn EngAlphaBlend(
        psoDest: *mut SURFOBJ,  // SURFOBJ* in/out
        psoSrc: *mut SURFOBJ,  // SURFOBJ* in/out
        pco: *mut CLIPOBJ,  // CLIPOBJ* in/out
        pxlo: *mut XLATEOBJ,  // XLATEOBJ* in/out
        prclDest: *mut RECTL,  // RECTL* in/out
        prclSrc: *mut RECTL,  // RECTL* in/out
        pBlendObj: *mut BLENDOBJ  // BLENDOBJ* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("GDI32.dll")]
public static extern bool EngAlphaBlend(IntPtr psoDest, IntPtr psoSrc, IntPtr pco, IntPtr pxlo, IntPtr prclDest, IntPtr prclSrc, IntPtr pBlendObj);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_EngAlphaBlend' -Namespace Win32 -PassThru
# $api::EngAlphaBlend(psoDest, psoSrc, pco, pxlo, prclDest, prclSrc, pBlendObj)

#uselib "GDI32.dll"
#func global EngAlphaBlend "EngAlphaBlend" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; EngAlphaBlend varptr(psoDest), varptr(psoSrc), varptr(pco), varptr(pxlo), varptr(prclDest), varptr(prclSrc), varptr(pBlendObj)   ; 戻り値は stat
; psoDest : SURFOBJ* in/out -> "sptr"
; psoSrc : SURFOBJ* in/out -> "sptr"
; pco : CLIPOBJ* in/out -> "sptr"
; pxlo : XLATEOBJ* in/out -> "sptr"
; prclDest : RECTL* in/out -> "sptr"
; prclSrc : RECTL* in/out -> "sptr"
; pBlendObj : BLENDOBJ* in/out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "GDI32.dll"
#cfunc global EngAlphaBlend "EngAlphaBlend" var, var, var, var, var, var, var
; res = EngAlphaBlend(psoDest, psoSrc, pco, pxlo, prclDest, prclSrc, pBlendObj)
; psoDest : SURFOBJ* in/out -> "var"
; psoSrc : SURFOBJ* in/out -> "var"
; pco : CLIPOBJ* in/out -> "var"
; pxlo : XLATEOBJ* in/out -> "var"
; prclDest : RECTL* in/out -> "var"
; prclSrc : RECTL* in/out -> "var"
; pBlendObj : BLENDOBJ* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; BOOL EngAlphaBlend(SURFOBJ* psoDest, SURFOBJ* psoSrc, CLIPOBJ* pco, XLATEOBJ* pxlo, RECTL* prclDest, RECTL* prclSrc, BLENDOBJ* pBlendObj)
#uselib "GDI32.dll"
#cfunc global EngAlphaBlend "EngAlphaBlend" var, var, var, var, var, var, var
; res = EngAlphaBlend(psoDest, psoSrc, pco, pxlo, prclDest, prclSrc, pBlendObj)
; psoDest : SURFOBJ* in/out -> "var"
; psoSrc : SURFOBJ* in/out -> "var"
; pco : CLIPOBJ* in/out -> "var"
; pxlo : XLATEOBJ* in/out -> "var"
; prclDest : RECTL* in/out -> "var"
; prclSrc : RECTL* in/out -> "var"
; pBlendObj : BLENDOBJ* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procEngAlphaBlend = gdi32.NewProc("EngAlphaBlend")
)

// psoDest (SURFOBJ* in/out), psoSrc (SURFOBJ* in/out), pco (CLIPOBJ* in/out), pxlo (XLATEOBJ* in/out), prclDest (RECTL* in/out), prclSrc (RECTL* in/out), pBlendObj (BLENDOBJ* in/out)
r1, _, err := procEngAlphaBlend.Call(
	uintptr(psoDest),
	uintptr(psoSrc),
	uintptr(pco),
	uintptr(pxlo),
	uintptr(prclDest),
	uintptr(prclSrc),
	uintptr(pBlendObj),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function EngAlphaBlend(
  psoDest: Pointer;   // SURFOBJ* in/out
  psoSrc: Pointer;   // SURFOBJ* in/out
  pco: Pointer;   // CLIPOBJ* in/out
  pxlo: Pointer;   // XLATEOBJ* in/out
  prclDest: Pointer;   // RECTL* in/out
  prclSrc: Pointer;   // RECTL* in/out
  pBlendObj: Pointer   // BLENDOBJ* in/out
): BOOL; stdcall;
  external 'GDI32.dll' name 'EngAlphaBlend';

result := DllCall("GDI32\EngAlphaBlend"
    , "Ptr", psoDest   ; SURFOBJ* in/out
    , "Ptr", psoSrc   ; SURFOBJ* in/out
    , "Ptr", pco   ; CLIPOBJ* in/out
    , "Ptr", pxlo   ; XLATEOBJ* in/out
    , "Ptr", prclDest   ; RECTL* in/out
    , "Ptr", prclSrc   ; RECTL* in/out
    , "Ptr", pBlendObj   ; BLENDOBJ* in/out
    , "Int")   ; return: BOOL

●EngAlphaBlend(psoDest, psoSrc, pco, pxlo, prclDest, prclSrc, pBlendObj) = DLL("GDI32.dll", "bool EngAlphaBlend(void*, void*, void*, void*, void*, void*, void*)")
# 呼び出し: EngAlphaBlend(psoDest, psoSrc, pco, pxlo, prclDest, prclSrc, pBlendObj)
# psoDest : SURFOBJ* in/out -> "void*"
# psoSrc : SURFOBJ* in/out -> "void*"
# pco : CLIPOBJ* in/out -> "void*"
# pxlo : XLATEOBJ* in/out -> "void*"
# prclDest : RECTL* in/out -> "void*"
# prclSrc : RECTL* in/out -> "void*"
# pBlendObj : BLENDOBJ* in/out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。