oaoa

模糊窗口

void SetWindowBlur(HWND hWnd)
{
	typedef enum _WINDOWCOMPOSITIONATTRIB
	{
		WCA_UNDEFINED = 0,
		WCA_NCRENDERING_ENABLED = 1,
		WCA_NCRENDERING_POLICY = 2,
		WCA_TRANSITIONS_FORCEDISABLED = 3,
		WCA_ALLOW_NCPAINT = 4,
		WCA_CAPTION_BUTTON_BOUNDS = 5,
		WCA_NONCLIENT_RTL_LAYOUT = 6,
		WCA_FORCE_ICONIC_REPRESENTATION = 7,
		WCA_EXTENDED_FRAME_BOUNDS = 8,
		WCA_HAS_ICONIC_BITMAP = 9,
		WCA_THEME_ATTRIBUTES = 10,
		WCA_NCRENDERING_EXILED = 11,
		WCA_NCADORNMENTINFO = 12,
		WCA_EXCLUDED_FROM_LIVEPREVIEW = 13,
		WCA_VIDEO_OVERLAY_ACTIVE = 14,
		WCA_FORCE_ACTIVEWINDOW_APPEARANCE = 15,
		WCA_DISALLOW_PEEK = 16,
		WCA_CLOAK = 17,
		WCA_CLOAKED = 18,
		WCA_ACCENT_POLICY = 19,
		WCA_FREEZE_REPRESENTATION = 20,
		WCA_EVER_UNCLOAKED = 21,
		WCA_VISUAL_OWNER = 22,
		WCA_HOLOGRAPHIC = 23,
		WCA_EXCLUDED_FROM_DDA = 24,
		WCA_PASSIVEUPDATEMODE = 25,
		WCA_USEDARKMODECOLORS = 26,
		WCA_LAST = 27
	} WINDOWCOMPOSITIONATTRIB;

	typedef struct _WINDOWCOMPOSITIONATTRIBDATA
	{
		WINDOWCOMPOSITIONATTRIB Attrib;
		PVOID pvData;
		SIZE_T cbData;
	} WINDOWCOMPOSITIONATTRIBDATA;

	typedef enum _ACCENT_STATE
	{
		ACCENT_DISABLED = 0,
		ACCENT_ENABLE_GRADIENT = 1,
		ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
		ACCENT_ENABLE_BLURBEHIND = 3,
		ACCENT_ENABLE_ACRYLICBLURBEHIND = 4, // RS4 1803
		ACCENT_ENABLE_HOSTBACKDROP = 5, // RS5 1809
		ACCENT_INVALID_STATE = 6
	} ACCENT_STATE;

	typedef struct _ACCENT_POLICY
	{
		ACCENT_STATE AccentState;
		DWORD AccentFlags;
		DWORD GradientColor;
		DWORD AnimationId;
	} ACCENT_POLICY;

	const HINSTANCE hModule = LoadLibrary(TEXT("user32.dll"));
	if (hModule)
	{
		typedef BOOL(WINAPI* pSetWindowCompositionAttribute)(HWND, WINDOWCOMPOSITIONATTRIBDATA*);
		const pSetWindowCompositionAttribute SetWindowCompositionAttribute = (pSetWindowCompositionAttribute)GetProcAddress(hModule, "SetWindowCompositionAttribute");
		if (SetWindowCompositionAttribute)
		{
			ACCENT_POLICY policy = { ACCENT_ENABLE_BLURBEHIND, 0, 0, 0 }; // ACCENT_ENABLE_BLURBEHIND=3...
			WINDOWCOMPOSITIONATTRIBDATA data = { WCA_ACCENT_POLICY, &policy, sizeof(WINDOWCOMPOSITIONATTRIBDATA) }; // WCA_ACCENT_POLICY=19
			SetWindowCompositionAttribute(hWnd, &data);
		}
		FreeLibrary(hModule);
	}
}

HRESULT EnableBlurBehind(HWND hwnd, DM::CRect rcCanvas)
{
    HRESULT hr = S_OK;

    // Create and populate the blur-behind structure.
    DWM_BLURBEHIND bb = {0};

    // Specify blur-behind and blur region.
    bb.dwFlags = DWM_BB_ENABLE | DWM_BB_BLURREGION;
    bb.fEnable = TRUE;
	bb.hRgnBlur = ::CreateRectRgnIndirect(rcCanvas);

    // Enable blur-behind.
    hr = DwmEnableBlurBehindWindow(hwnd, &bb);
    return hr;
}

Windows with C++ - High-Performance Window Layering Using the Windows Composition Engine

June 2014 Volume 29 Number 6 Kenny Kerr | June 2014 I've been fascinated by layered windows since I first came across them in Windows XP. The ability to escape the rectangular, or near-rectangular, bounds of a traditional desktop window always seemed so intriguing to me. And then Windows Vista happened.

https://docs.microsoft.com/en-us/archive/msdn-magazine/2014/june/windows-with-c-high-performance-window-layering-using-the-windows-composition-engine

Acrylic material in win32 app

Sciter 4.2 adds support of acrylic backgrounds (on Windows and MacOS): Acrylic theme and UWP alike controls (CSS styled) in Sciter: uSciter demo browser, Windows: uSciter demo browser, MacOS: Sciter on Windows is an ordinary Win32 application (not UWP). In order to render that blurbehind it does the following: Creates window with WS_EX_NOREDIRECTIONBITMAP ex flag.

https://stackoverflow.com/questions/43931709/acrylic-material-in-win32-app

Windows下使用Direct3D和OpenGl创建带Alpha透明的窗口

Hxmg/Direct3DandOpenGLTransparentWindow 该方法适用于OpenGL， 只要在创建OpenGL上下文之前，调用DWMApi的 DwmEnableBlurBehindWindow 即可。 这个函数在Windows7上是用来开启窗口的背景毛玻璃效果的 适用于Direct3D / 2D 。 在Windows Vista 以上的系统，桌面使用支持硬件加速的DWM来渲染窗口。 每个窗口在创建时，会为窗口客户区创建一个离屏表面，窗口的内容（按钮、编辑框等等等...）最终会绘制到这个离屏表面。这样DWM在渲染窗口时，绘制一个窗口边框并把对应窗口的离屏表面和窗口边框组合在一起，就形成了整个电脑桌面。 窗口的离屏表面也叫做重定向表面 在创建窗口是给定窗口扩展样式 WS_EX_NOREDIRECTIONBITMAP 这样创建出来的窗口就没有重定向表面，客户区显示出来是透明的。 然后用到 DirectComposition API DirectComposition 可以在窗口上合成位图 具体代码见 d2d_code.cpp 的 InitDirect2D() 函数里，下面是摘取的代码片段 //............ //使用 DXGIFactory2 里面的 CreateSwapChainForComposition 来创建交换链 //.............................. //............

https://zhuanlan.zhihu.com/p/64262579