Sets the corner rounding preferences in windows 11. Works with Tao's window handle hwnd() method.

set_corner_preference.rs

#[cfg(target_os = "windows")]

use windows::Win32::Graphics::Dwm::{ 
    DwmSetWindowAttribute, 
    DWM_WINDOW_CORNER_PREFERENCE, 
    DWMWA_WINDOW_CORNER_PREFERENCE,
    DWMWCP_ROUND, DWMWCP_ROUNDSMALL, DWMWCP_DEFAULT, DWMWCP_DONOTROUND,
};
use windows::Win32::Foundation::HWND;
use core::mem;

#[repr(i32)]
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub enum CornerPreference{
    #[default]
    Default = DWMWCP_DEFAULT.0,
    DoNotRound = DWMWCP_DONOTROUND.0,
    Round = DWMWCP_ROUND.0,
    RoundSmall = DWMWCP_ROUNDSMALL.0,
}

pub fn set_corner_preference(hwnd:HWND ,prefs:CornerPreference){
    unsafe{
        let _ = DwmSetWindowAttribute(
            HWND(hwnd.0),
            DWMWA_WINDOW_CORNER_PREFERENCE,
            &(prefs as i32) as *const _ as _, 
            mem::size_of::<DWM_WINDOW_CORNER_PREFERENCE>() as _,
        );
    }
}