win,linux remove desktop wallpaper

Signed-off-by: 21pages <pages21@163.com>

src/platform/linux.rs

@@ -5,7 +5,9 @@ use desktop::Desktop;
 use hbb_common::config::CONFIG_OPTION_ALLOW_LINUX_HEADLESS;
 pub use hbb_common::platform::linux::*;
 use hbb_common::{
-    allow_err, bail,
+    allow_err,
+    anyhow::anyhow,
+    bail,
     config::Config,
     libc::{c_char, c_int, c_long, c_void},
     log,
@@ -26,6 +28,7 @@ use std::{
     time::{Duration, Instant},
 };
 use users::{get_user_by_name, os::unix::UserExt};
+use wallpaper;
 
 type Xdo = *const c_void;
 
@@ -1311,3 +1314,41 @@ NoDisplay=false
     }
     Ok(())
 }
+
+pub struct WallPaperRemover {
+    old_path: String,
+    old_path_dark: Option<String>, // ubuntu 22.04 light/dark theme have different uri
+}
+
+impl WallPaperRemover {
+    pub fn new() -> ResultType<Self> {
+        let start = std::time::Instant::now();
+        let old_path = wallpaper::get().map_err(|e| anyhow!(e.to_string()))?;
+        let old_path_dark = wallpaper::get_dark().ok();
+        if old_path.is_empty() && old_path_dark.clone().unwrap_or_default().is_empty() {
+            bail!("already solid color");
+        }
+        wallpaper::set_from_path("").map_err(|e| anyhow!(e.to_string()))?;
+        wallpaper::set_dark_from_path("").ok();
+        log::info!(
+            "created wallpaper remover,  old_path:{:?}, old_path_dark:{:?}, elapsed:{:?}",
+            old_path,
+            old_path_dark,
+            start.elapsed(),
+        );
+        Ok(Self {
+            old_path,
+            old_path_dark,
+        })
+    }
+}
+
+impl Drop for WallPaperRemover {
+    fn drop(&mut self) {
+        allow_err!(wallpaper::set_from_path(&self.old_path).map_err(|e| anyhow!(e.to_string())));
+        if let Some(old_path_dark) = &self.old_path_dark {
+            allow_err!(wallpaper::set_dark_from_path(old_path_dark.as_str())
+                .map_err(|e| anyhow!(e.to_string())));
+        }
+    }
+}