public static void EnableBlur(IntPtr HWnd, bool hasFrame = true)
{
AccentPolicy accent = new AccentPolicy();
accent.AccentState = AccentState.ACCENT_ENABLE_BLURBEHIND;
if (hasFrame)
{
accent.AccentFlags = 0x20 | 0x40 | 0x80 | 0x100;
}
int accentStructSize = Marshal.SizeOf(accent);
IntPtr accentPtr = Marshal.AllocHGlobal(accentStructSize);
Marshal.StructureToPtr(accent, accentPtr, false);
WindowCompositionAttributeData data = new WindowCompositionAttributeData();
data.Attribute = WindowCompositionAttribute.WCA_ACCENT_POLICY;
data.SizeOfData = accentStructSize;
data.Data = accentPtr;
WinAPI.SetWindowCompositionAttribute(HWnd, ref data);
Marshal.FreeHGlobal(accentPtr);
}