Add config support for coordinate and size adjustment for ueberzugpp image preview

Fix https://github.com/sxyazi/yazi/issues/302

Example usage in yazi.toml for a 2.0 scale monitor on Hyprland:
```
[preview.ueberzug]
scale_down_factor = 2.0
x_coordinate_offset = 0.5
y_coordinate_offset = 0.5
width_adjustment = -0.5
height_adjustment = -0.5
```

yazi-adaptor/Cargo.toml

@@ -21,4 +21,4 @@ ratatui     = "^0"
 tokio       = { version = "^1", features = [ "parking_lot", "io-util", "process" ] }
 
 # Logging
-tracing = "^0"
+tracing = {version = "^0", features = ["max_level_debug", "release_max_level_warn"]}

yazi-adaptor/src/ueberzug.rs

@@ -1,8 +1,15 @@
+use std::cmp::max;
 use std::{path::PathBuf, process::Stdio};
+use tracing::debug;
 
 use anyhow::Result;
 use ratatui::prelude::Rect;
-use tokio::{io::AsyncWriteExt, process::{Child, Command}, sync::mpsc::{self, UnboundedSender}};
+use tokio::{
+	io::AsyncWriteExt,
+	process::{Child, Command},
+	sync::mpsc::{self, UnboundedSender},
+};
+use yazi_config::PREVIEW;
 
 use crate::Adaptor;
 
@@ -31,6 +38,19 @@ impl Ueberzug {
 		Ok(tx)
 	}
 
+	fn adjust_rect(mut rect: Rect) -> Rect {
+		let cfg = &PREVIEW.ueberzug;
+		rect.x =
+			max((rect.x as f64 / cfg.scale_down_factor + cfg.x_offset) as i32, 0) as u16;
+		rect.y =
+			max((rect.y as f64 / cfg.scale_down_factor + cfg.y_offset) as i32, 0) as u16;
+		rect.width =
+			max((rect.width as f64 / cfg.scale_down_factor + cfg.width_offset) as i32, 0) as u16;
+		rect.height =
+			max((rect.height as f64 / cfg.scale_down_factor + cfg.height_offset) as i32, 0) as u16;
+		return rect;
+	}
+
 	fn create_demon(adaptor: Adaptor) -> Result<Child> {
 		Ok(
 			Command::new("ueberzug")
@@ -44,7 +64,10 @@ impl Ueberzug {
 
 	async fn send_command(child: &mut Child, cmd: Option<(PathBuf, Rect)>) -> Result<()> {
 		let stdin = child.stdin.as_mut().unwrap();
-		if let Some((path, rect)) = cmd {
+		if let Some((path, tmp_rect)) = cmd {
+			debug!("ueberzug rect before adjustment: {:?}", tmp_rect);
+			let rect = Self::adjust_rect(tmp_rect);
+			debug!("ueberzug rect after adjust adjustment: {:?}", rect);
 			let s = format!(
 				r#"{{"action":"add","identifier":"yazi","x":{},"y":{},"max_width":{},"max_height":{},"path":"{}"}}{}"#,
 				rect.x,

yazi-config/preset/yazi.toml

@@ -14,6 +14,16 @@ max_width  = 600
 max_height = 900
 cache_dir  = ""
 
+[preview.ueberzug]
+# Scale down the coordinate and size of image preview that is incorrectly scaled
+# up by ueberzugpp in Wayland (tested under Hyprland). Example usage: if your
+# monitor has a 2.0 scale factor, you should pass 2.0 here.
+scale_down_factor = 1.0
+x_offset = 0.0
+y_offset = 0.0
+width_offset = 0.0
+height_offset = 0.0
+
 [opener]
 edit = [
 	{ exec = '$EDITOR "$@"', block = true,  for = "unix" },

yazi-config/src/preview/preview.rs

@@ -1,4 +1,7 @@
-use std::{path::{Path, PathBuf}, time::{self, SystemTime}};
+use std::{
+	path::{Path, PathBuf},
+	time::{self, SystemTime},
+};
 
 use md5::{Digest, Md5};
 use serde::Deserialize;
@@ -6,13 +9,24 @@ use yazi_shared::expand_path;
 
 use crate::{xdg::Xdg, MERGED_YAZI};
 
+#[derive(Debug, Deserialize)]
+pub struct UeberzugPreview {
+	pub scale_down_factor: f64,
+	pub x_offset: f64,
+	pub y_offset: f64,
+	pub width_offset: f64,
+	pub height_offset: f64,
+}
+
 #[derive(Debug)]
 pub struct Preview {
-	pub tab_size:   u32,
+	pub tab_size: u32,
-	pub max_width:  u32,
+	pub max_width: u32,
 	pub max_height: u32,
 
 	pub cache_dir: PathBuf,
+
+	pub ueberzug: UeberzugPreview,
 }
 
 impl Default for Preview {
@@ -23,11 +37,13 @@ impl Default for Preview {
 		}
 		#[derive(Deserialize)]
 		struct Shadow {
-			tab_size:   u32,
+			tab_size: u32,
-			max_width:  u32,
+			max_width: u32,
 			max_height: u32,
 
 			cache_dir: Option<String>,
+
+			ueberzug: UeberzugPreview,
 		}
 
 		let preview = toml::from_str::<Outer>(&MERGED_YAZI).unwrap().preview;
@@ -41,6 +57,8 @@ impl Default for Preview {
 			max_height: preview.max_height,
 
 			cache_dir,
+
+			ueberzug: preview.ueberzug,
 		}
 	}
 }