DWMの半透明ウィンドウとDirect2D描画の共存ができるようになった。

diff --git a/wintimer/sf_windows.cpp b/wintimer/sf_windows.cpp
index 0aead2d..1aaef5d 100644 (file)
--- a/wintimer/sf_windows.cpp
+++ b/wintimer/sf_windows.cpp
@@ -196,9 +196,16 @@ namespace sf
         rc.right - rc.left,
         rc.bottom - rc.top
         );
+      
+      const D2D1_PIXEL_FORMAT format =
+          D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM,
+                            D2D1_ALPHA_MODE_PREMULTIPLIED);
+      
+      const D2D1_RENDER_TARGET_PROPERTIES target_prop = 
+          D2D1::RenderTargetProperties(D2D1_RENDER_TARGET_TYPE_DEFAULT,format);
 
       THROW_IFERR(factory_->CreateHwndRenderTarget(
-        D2D1::RenderTargetProperties(),
+        target_prop,
         D2D1::HwndRenderTargetProperties(hwnd_, size,D2D1_PRESENT_OPTIONS_IMMEDIATELY),
         &render_target_
         ));