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HMODULE hUser = GetModuleHandleA("user32.dll");
if (hUser)
{
pfnSetWindowCompositionAttribute setWindowCompositionAttribute = (pfnSetWindowCompositionAttribute)GetProcAddress(hUser, "SetWindowCompositionAttribute");
if (setWindowCompositionAttribute)
{
ACCENT_POLICY accent = { ACCENT_ENABLE_BLURBEHIND, 0, 0, 0 };
WINDOWCOMPOSITIONATTRIBDATA data;
data.Attrib = WCA_ACCENT_POLICY;
data.pvData = &accent;
data.cbData = sizeof(accent);
setWindowCompositionAttribute(hWnd, &data);
}
}
#pragma once
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;
typedef BOOL (WINAPI *pfnGetWindowCompositionAttribute)(HWND, WINDOWCOMPOSITIONATTRIBDATA*);
typedef BOOL (WINAPI *pfnSetWindowCompositionAttribute)(HWND, WINDOWCOMPOSITIONATTRIBDATA*);
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@KitsuneAlex KitsuneAlex commented Nov 27, 2019

Very useful, thanks a bunch! <3

@Qix-

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@Qix- Qix- commented Dec 26, 2020

Any reason why the ACCENT_ENABLE_ACRYLICBLURBEHIND setting would cause immense performance dropoff? I can't find any information as to how to improve that.

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@KitsuneAlex KitsuneAlex commented Feb 1, 2021

It is an internal function which emulates the behaviour of the AcrylicBrush from the new WinUI toolkit. For some reason it has these performance issues and is only used for the taskbar, which makes it go by unnoticed since the taskbar is static. I've been waiting for a couple of windows builds now since over a year and this hasn't been adressed yet sadly. I was looking into WinUI and found a way to couple WinUI with a classic Win32 application, which worked nicely, the only thing that didn't work tho was the looked after AcrylicBrush which depends on the HostBackdropBrush (you can look all of these up on MSDN) :/

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@Qix- Qix- commented Feb 2, 2021

@KitsuneAlex that makes sense, thanks for the information. I wish M$ would give us an API to do it nicely :/

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