129 lines
4.5 KiB
Rust
129 lines
4.5 KiB
Rust
//! Native materials are applied on the UI thread. Unsupported systems stay
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//! opaque; stored preferences are retained for the user's next supported session.
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use crate::settings::BackgroundMaterial;
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use serde::Serialize;
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use tauri::WebviewWindow;
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#[derive(Clone, Debug, Serialize)]
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pub struct AppearanceStatus {
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pub requested_material: BackgroundMaterial,
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pub effective_material: BackgroundMaterial,
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pub opacity: u8,
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pub native_effect: bool,
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pub fallback_reason: Option<String>,
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}
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pub fn apply(
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window: &WebviewWindow,
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material: BackgroundMaterial,
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opacity: u8,
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high_contrast: bool,
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) -> AppearanceStatus {
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let mut status = AppearanceStatus {
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requested_material: material,
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effective_material: BackgroundMaterial::Solid,
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opacity,
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native_effect: false,
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fallback_reason: None,
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};
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if high_contrast || material == BackgroundMaterial::Solid || opacity == 100 {
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#[cfg(windows)]
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{
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let _ = window_vibrancy::clear_acrylic(window);
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}
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if high_contrast {
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status.fallback_reason = Some("High contrast uses an opaque background.".into());
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}
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return status;
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}
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#[cfg(windows)]
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{
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if !native_backdrop_available() {
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status.fallback_reason = Some("Glass requires Windows 11 22H2 or newer with desktop composition enabled and high contrast off. Using a solid background.".into());
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return status;
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}
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let _ = window_vibrancy::clear_acrylic(window);
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// Keep the webview clear; the frontend draws a theme-aware readable tint.
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let result = window
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.set_background_color(Some(tauri::window::Color(0, 0, 0, 0)))
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.map_err(|error| error.to_string())
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.and_then(|()| {
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match material {
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BackgroundMaterial::Glass => {
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window_vibrancy::apply_acrylic(window, Some((0, 0, 0, 0)))
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}
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BackgroundMaterial::Frosted => {
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window_vibrancy::apply_acrylic(window, Some((0, 0, 0, 0)))
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}
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BackgroundMaterial::Solid => unreachable!(),
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}
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.map_err(|error| error.to_string())
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});
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match result {
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Ok(()) => {
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status.effective_material = material;
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status.native_effect = true;
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}
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Err(_) => {
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status.fallback_reason =
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Some("Native transparency is unavailable. Using a solid background.".into());
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}
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}
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}
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#[cfg(not(windows))]
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{
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let _ = window;
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status.fallback_reason = Some(
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if cfg!(target_os = "macos") {
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"Native glass is unavailable in this macOS build. Using a solid background."
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} else {
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"Native glass is unavailable on this desktop. Using a solid background."
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}
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.into(),
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);
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}
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status
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}
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#[cfg(windows)]
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fn native_backdrop_available() -> bool {
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use windows_sys::Win32::UI::Accessibility::{HCF_HIGHCONTRASTON, HIGHCONTRASTW};
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use windows_sys::Win32::{
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Graphics::Dwm::DwmIsCompositionEnabled,
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UI::WindowsAndMessaging::{SystemParametersInfoW, SPI_GETHIGHCONTRAST},
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};
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let mut composition = 0;
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let mut contrast = HIGHCONTRASTW {
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cbSize: std::mem::size_of::<HIGHCONTRASTW>() as u32,
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dwFlags: 0,
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lpszDefaultScheme: std::ptr::null_mut(),
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};
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// Failure to query accessibility/composition is treated conservatively.
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unsafe {
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if DwmIsCompositionEnabled(&mut composition) < 0
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|| composition == 0
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|| SystemParametersInfoW(
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SPI_GETHIGHCONTRAST,
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contrast.cbSize,
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&mut contrast as *mut _ as *mut _,
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0,
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) == 0
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|| contrast.dwFlags & HCF_HIGHCONTRASTON != 0
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{
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return false;
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}
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}
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// The established crate checks the HRESULT of the public backdrop API on
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// Windows 11 22H2+. Its older undocumented path cannot confirm success.
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let mut version = windows_sys::Win32::System::SystemInformation::OSVERSIONINFOW {
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dwOSVersionInfoSize: std::mem::size_of::<
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windows_sys::Win32::System::SystemInformation::OSVERSIONINFOW,
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>() as u32,
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..unsafe { std::mem::zeroed() }
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};
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unsafe {
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windows_sys::Wdk::System::SystemServices::RtlGetVersion(&mut version) >= 0
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&& version.dwBuildNumber >= 22621
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}
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}
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