Need help with SetWindowCompositionAttribute and Blur

[WildByDesign]

There are some great examples for adding Blur to the GUI throughout the forum.

However, the types of blur that are covered in those examples are a bit outdated:

;ACCENT_STATE
Global Const $ACCENT_DISABLED = 0
Global Const $ACCENT_ENABLE_GRADIENT = 1
Global Const $ACCENT_ENABLE_TRANSPARENTGRADIENT = 2
Global Const $ACCENT_ENABLE_BLURBEHIND = 3
Global Const $ACCENT_INVALID_STATE = 4

Since that time, those options have expanded more to the following:

ACCENT_DISABLED = 0
ACCENT_ENABLE_GRADIENT = 1
ACCENT_ENABLE_TRANSPARENTGRADIENT = 2
ACCENT_ENABLE_BLURBEHIND = 3
ACCENT_ENABLE_ACRYLICBLURBEHIND = 4
ACCENT_ENABLE_HOSTBACKDROP = 5
ACCENT_INVALID_STATE = 6

I am particularly curious about ACCENT_ENABLE_HOSTBACKDROP but it does not come up in any searches on this forum.

I will share an example GUI blur that is working (requires Windows 11):

Spoiler

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#include <GUIConstantsEx.au3>
#include <WinAPIGdi.au3>

$hGUI = GUICreate("Example", 400, 400)
GUISetBkColor(0x000000)

GUISetState(@SW_SHOW)

_WinAPI_DwmSetWindowAttribute__($hGUI, 20, 1)

Local $hRgn = _WinAPI_CreateEllipticRgn(_WinAPI_CreateRectEx(0, 0, 0, 0))
_WinAPI_DwmEnableBlurBehindWindow($hGUI, 1, 0, $hRgn)
If $hRgn Then
    _WinAPI_DeleteObject($hRgn)
EndIf

$tAccentPolicy = DllStructCreate("int AccentState; int AccentFlags; int GradientColor; int AnimationId")
$tAttrData = DllStructCreate("dword Attribute; ptr DataBuffer; ulong Size")
$tAccentPolicy.AccentState = 3
$tAttrData.Attribute = 19 ; WCA_ACCENT_POLICY
$tAttrData.DataBuffer = DllStructGetPtr($tAccentPolicy)
$tAttrData.Size = DllStructGetSize($tAccentPolicy)
$aResult = DllCall("user32.dll", "bool", "SetWindowCompositionAttribute", "hwnd", $hGUI, "ptr", DllStructGetPtr($tAttrData))

_WinAPI_DwmExtendFrameIntoClientArea($hGUI, _WinAPI_CreateMargins(-1, -1, -1, -1))


 While 1
    Switch GUIGetMsg()
        Case $GUI_EVENT_CLOSE
            ExitLoop

    EndSwitch
WEnd

Func _WinAPI_DwmSetWindowAttribute__($hwnd, $attribute = 34, $value = 0x00FF00, $valLen = 4)
    Local $aCall = DllCall('dwmapi.dll', 'long', 'DwmSetWindowAttribute', 'hwnd', $hWnd, 'dword', $attribute, 'dword*', $value, 'dword', $valLen)
    If @error Then Return SetError(@error, @extended, 0)
    If $aCall[0] Then Return SetError(10, $aCall[0], 0)
    Return 1
EndFunc   ;==>_WinAPI_DwmSetWindowAttribute__

 

The problem that I have is that I am still very much a beginner here. I don't understand DllStruct at all. 

Thank you for your time and suggestions. I appreciate it very much.

Edited 10 hours ago by WildByDesign

[WildByDesign]

Another thing that I am interested in is having the blur blended with a color. None of the examples for that in the forum have worked or were complete.