Background mouse click offset

[xxdoc]

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left_down(handle: HWND, x: int, y: int): ""

Args:
    handle (HWND): 
    x (int): 
    y (int): 
"""
# https://docs.microsoft.com/en-us/windows/win32/inputdev/wm-lbuttondown
wparam = 0
lparam = y << 16 | x
PostMessageW(handle, WM_LBUTTONDOWN, wparam, lparam)

left_up(handle: HWND, x: int, y: int): ""

Args:
    handle (HWND): 
    x (int): 
    y (int): 
"""
# https://docs.microsoft.com/en-us/windows/win32/inputdev/wm-lbuttonup
wparam = 0
lparam = y << 16 | x
PostMessageW(handle, WM_LBUTTONUP, wparam, lparam)

I used do left_down hwnd,100,100 left_up hwnd，100，100 sleep 100 loop

I click the coordinate points in the screen through the API loop. If the mouse position is in the image of scrcpy, the clicked coordinates are not offset. If you move the mouse to other programs, you can observe that the mouse click points displayed in scrcpy will not always be at the coordinates of 100,100, and there will be an offset with the change of mouse position. Can this be avoided?