d3d12: Move d3d12 files to separate solution.

It simplify solution configurations.

minidx12/Include/d2d1_2helper.h

@@ -0,0 +1,65 @@
+
+/*=========================================================================*\
+
+    Copyright (c) Microsoft Corporation.  All rights reserved.
+
+    File: D2D1_2Helper.h
+
+    Module Name: D2D
+
+    Description: Helper files over the D2D interfaces and APIs.
+
+\*=========================================================================*/
+
+#ifdef _MSC_VER
+#pragma once
+#endif  // _MSC_VER
+
+#ifndef _D2D1_2HELPER_H_
+#define _D2D1_2HELPER_H_
+
+#if NTDDI_VERSION >= NTDDI_WINBLUE
+
+#ifndef _D2D1_2_H_
+#include <d2d1_2.h>
+#endif // #ifndef _D2D1_2_H_
+
+#ifndef D2D_USE_C_DEFINITIONS
+
+#include <winapifamily.h>
+
+#pragma region Application Family
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP)
+
+namespace D2D1
+{
+    COM_DECLSPEC_NOTHROW
+    D2D1FORCEINLINE
+    FLOAT
+    ComputeFlatteningTolerance(
+        _In_ CONST D2D1_MATRIX_3X2_F &matrix,
+        FLOAT dpiX = 96.0f,
+        FLOAT dpiY = 96.0f,
+        FLOAT maxZoomFactor = 1.0f
+        )
+    {
+        D2D1_MATRIX_3X2_F dpiDependentTransform =
+            matrix * D2D1::Matrix3x2F::Scale(dpiX / 96.0f, dpiY / 96.0f);
+
+        FLOAT absMaxZoomFactor = (maxZoomFactor > 0) ? maxZoomFactor : -maxZoomFactor;
+
+        return D2D1_DEFAULT_FLATTENING_TOLERANCE / 
+            (absMaxZoomFactor * D2D1ComputeMaximumScaleFactor(&dpiDependentTransform));
+    }
+
+} // namespace D2D1
+
+#endif /* WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) */
+#pragma endregion
+
+#endif // #ifndef D2D_USE_C_DEFINITIONS
+
+#endif // #if NTDDI_VERSION >= NTDDI_WINBLUE
+
+#endif // #ifndef _D2D1_HELPER_H_
+