D2D1 图像资源操作 创建图层画刷

代码说明：

#include #include // for IWICImagingFactory #include   #define SAFE_RELEASE(P) if(P){P->Release() ; P = NULL ;} ID2D1Factory* g_pD2DFactory = NULL ; // Direct2D factory ID2D1HwndRenderTarget* g_pRenderTarget = NULL; // Render target ID2D1SolidColorBrush* g_pBlackBrush = NULL ; // A black brush, reflect the line color ID2D1RadialGradientBrush* g_pRadialGradientBrush = NULL ; // Radial gradient brush ID2D1Layer* g_pLayer = NULL ; ID2D1Bitmap* g_pBitmap = NULL ; IWICImagingFactory* g_pWICFactory = NULL ; HWND g_Hwnd ; // Window handle // Creates a Direct2D bitmap from file HRESULT LoadBitmapFromFile(   ID2D1RenderTarget *pRenderTarget,   IWICImagingFactory *pIWICFactory,   PCWSTR uri,   UINT dest