add shcore

constants.go

@@ -3026,3 +3026,25 @@ const (
 	ALPC_SYNC_OBJECT_TYPE   uint32 = 2
 	ALPC_THREAD_OBJECT_TYPE uint32 = 4
 )
+
+// Device scale factor
+// https://docs.microsoft.com/zh-cn/windows/win32/api/shtypes/ne-shtypes-device_scale_factor
+const (
+	DEVICE_SCALE_FACTOR_INVALID = 0
+	SCALE_100_PERCENT           = 100
+	SCALE_120_PERCENT           = 120
+	SCALE_125_PERCENT           = 125
+	SCALE_140_PERCENT           = 140
+	SCALE_150_PERCENT           = 150
+	SCALE_160_PERCENT           = 160
+	SCALE_175_PERCENT           = 175
+	SCALE_180_PERCENT           = 180
+	SCALE_200_PERCENT           = 200
+	SCALE_225_PERCENT           = 225
+	SCALE_250_PERCENT           = 250
+	SCALE_300_PERCENT           = 300
+	SCALE_350_PERCENT           = 350
+	SCALE_400_PERCENT           = 400
+	SCALE_450_PERCENT           = 450
+	SCALE_500_PERCENT           = 500
+)

shcore.go

@@ -0,0 +1,24 @@
+// Copyright 2010-2012 The W32 Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package w32
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var (
+	modshcore = syscall.NewLazyDLL("Shcore.dll")
+
+	getScaleFactorForMonitor = modshcore.NewProc("GetScaleFactorForMonitor")
+)
+
+func GetScaleFactorForMonitor(hMonitor HMONITOR, scale *int) HRESULT {
+	ret, _, _ := getScaleFactorForMonitor.Call(
+		uintptr(hMonitor),
+		uintptr(unsafe.Pointer(scale)))
+
+	return HRESULT(ret)
+}