d2d1_2helper.h

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/*=========================================================================*\

 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_