Frosted glass transparency

[Josh]

This is how I make transparent window effects:

// Enable transparency effects
#ifdef _WIN32
auto hwnd = window->GetHandle();

struct ACCENTPOLICY
{
  int na;
  int nf;
  int nc;
  int nA;
};
struct WINCOMPATTRDATA
{
  int na;
  PVOID pd;
  ULONG ul;
};

const HINSTANCE hm = LoadLibraryW(L"user32.dll");
if (hm)
{
  typedef BOOL(WINAPI* pSetWindowCompositionAttribute)(HWND, WINCOMPATTRDATA*);

  const pSetWindowCompositionAttribute SetWindowCompositionAttribute = (pSetWindowCompositionAttribute)GetProcAddress(hm, "SetWindowCompositionAttribute");
  if (SetWindowCompositionAttribute)
  {
    ACCENTPOLICY policy = { 4, 0, 155, 0 };
    //ACCENTPOLICY policy = { 3, 0, 0, 0 }; // and even works 4,0,155,0 (Acrylic blur)
    WINCOMPATTRDATA data = { 19, &policy,sizeof(ACCENTPOLICY) };
    SetWindowCompositionAttribute(hwnd, &data);
  }
  FreeLibrary(hm);				
}			
#endif

You probably want to set your interface's background panel color to 0,0,0,1 for best results.