feat: support customizable alignment for image display

yazi-adapter/src/adapter.rs

@@ -5,7 +5,7 @@ use ratatui::layout::Rect;
 use tracing::warn;
 use yazi_shared::env_exists;
 
-use crate::{Brand, Emulator, SHOWN, TMUX, WSL, drivers};
+use crate::{Brand, Emulator, Offset, SHOWN, TMUX, WSL, drivers};
 
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
 pub enum Adapter {
@@ -35,18 +35,18 @@ impl Display for Adapter {
 }
 
 impl Adapter {
-	pub async fn image_show(self, path: &Path, max: Rect) -> Result<Rect> {
+	pub async fn image_show(self, path: &Path, max: Rect, offset: Option<Offset>) -> Result<Rect> {
 		if max.is_empty() {
 			return Ok(Rect::default());
 		}
 
 		match self {
-			Self::Kgp => drivers::Kgp::image_show(path, max).await,
-			Self::KgpOld => drivers::KgpOld::image_show(path, max).await,
-			Self::Iip => drivers::Iip::image_show(path, max).await,
-			Self::Sixel => drivers::Sixel::image_show(path, max).await,
-			Self::X11 | Self::Wayland => drivers::Ueberzug::image_show(path, max).await,
-			Self::Chafa => drivers::Chafa::image_show(path, max).await,
+			Self::Kgp => drivers::Kgp::image_show(path, max, offset).await,
+			Self::KgpOld => drivers::KgpOld::image_show(path, max, offset).await,
+			Self::Iip => drivers::Iip::image_show(path, max, offset).await,
+			Self::Sixel => drivers::Sixel::image_show(path, max, offset).await,
+			Self::X11 | Self::Wayland => drivers::Ueberzug::image_show(path, max, offset).await,
+			Self::Chafa => drivers::Chafa::image_show(path, max, offset).await,
 		}
 	}
 

yazi-adapter/src/drivers/chafa.rs

@@ -3,15 +3,15 @@ use std::{io::Write, path::Path, process::Stdio};
 use ansi_to_tui::IntoText;
 use anyhow::{Result, bail};
 use crossterm::{cursor::MoveTo, queue};
-use ratatui::layout::Rect;
+use ratatui::layout::{Rect, Size};
 use tokio::process::Command;
 
-use crate::{Adapter, Emulator};
+use crate::{Adapter, Emulator, Offset};
 
 pub(crate) struct Chafa;
 
 impl Chafa {
-	pub(crate) async fn image_show(path: &Path, max: Rect) -> Result<Rect> {
+	pub(crate) async fn image_show(path: &Path, max: Rect, offset: Option<Offset>) -> Result<Rect> {
 		let output = Command::new("chafa")
 			.args([
 				"-f",
@@ -46,11 +46,13 @@ impl Chafa {
 			bail!("failed to parse chafa output");
 		};
 
-		let area = Rect {
-			x:      max.x,
-			y:      max.y,
-			width:  first.width() as u16,
-			height: lines.len() as u16,
+		let area = {
+			let width = first.width() as u16;
+			let height = lines.len() as u16;
+			let offset = offset.unwrap_or_else(|| {
+				Offset::from((Size { width, height }, Size { width: max.width, height: max.height }))
+			});
+			Rect { x: max.x + offset.x, y: max.y + offset.y, width, height }
 		};
 
 		Adapter::Chafa.image_hide()?;

yazi-adapter/src/drivers/iip.rs

@@ -7,14 +7,14 @@ use image::{DynamicImage, ExtendedColorType, ImageEncoder, codecs::{jpeg::JpegEn
 use ratatui::layout::Rect;
 use yazi_config::PREVIEW;
 
-use crate::{CLOSE, Emulator, Image, START, adapter::Adapter};
+use crate::{CLOSE, Emulator, Image, Offset, START, adapter::Adapter};
 
 pub(crate) struct Iip;
 
 impl Iip {
-	pub(crate) async fn image_show(path: &Path, max: Rect) -> Result<Rect> {
+	pub(crate) async fn image_show(path: &Path, max: Rect, offset: Option<Offset>) -> Result<Rect> {
 		let img = Image::downscale(path, max).await?;
-		let area = Image::pixel_area((img.width(), img.height()), max);
+		let area = Image::pixel_area((img.width(), img.height()), max, offset);
 		let b = Self::encode(img).await?;
 
 		Adapter::Iip.image_hide()?;

yazi-adapter/src/drivers/kgp.rs

@@ -7,7 +7,7 @@ use crossterm::{cursor::MoveTo, queue};
 use image::DynamicImage;
 use ratatui::layout::Rect;
 
-use crate::{CLOSE, ESCAPE, Emulator, START, adapter::Adapter, image::Image};
+use crate::{CLOSE, ESCAPE, Emulator, Offset, START, adapter::Adapter, image::Image};
 
 static DIACRITICS: [char; 297] = [
 	'\u{0305}',
@@ -312,9 +312,9 @@ static DIACRITICS: [char; 297] = [
 pub(crate) struct Kgp;
 
 impl Kgp {
-	pub(crate) async fn image_show(path: &Path, max: Rect) -> Result<Rect> {
+	pub(crate) async fn image_show(path: &Path, max: Rect, offset: Option<Offset>) -> Result<Rect> {
 		let img = Image::downscale(path, max).await?;
-		let area = Image::pixel_area((img.width(), img.height()), max);
+		let area = Image::pixel_area((img.width(), img.height()), max, offset);
 
 		let b1 = Self::encode(img).await?;
 		let b2 = Self::place(&area)?;

yazi-adapter/src/drivers/kgp_old.rs

@@ -6,14 +6,14 @@ use base64::{Engine, engine::general_purpose};
 use image::DynamicImage;
 use ratatui::layout::Rect;
 
-use crate::{CLOSE, ESCAPE, Emulator, Image, START, adapter::Adapter};
+use crate::{CLOSE, ESCAPE, Emulator, Image, Offset, START, adapter::Adapter};
 
 pub(crate) struct KgpOld;
 
 impl KgpOld {
-	pub(crate) async fn image_show(path: &Path, max: Rect) -> Result<Rect> {
+	pub(crate) async fn image_show(path: &Path, max: Rect, offset: Option<Offset>) -> Result<Rect> {
 		let img = Image::downscale(path, max).await?;
-		let area = Image::pixel_area((img.width(), img.height()), max);
+		let area = Image::pixel_area((img.width(), img.height()), max, offset);
 		let b = Self::encode(img).await?;
 
 		Adapter::KgpOld.image_hide()?;

yazi-adapter/src/drivers/sixel.rs

@@ -7,14 +7,14 @@ use image::DynamicImage;
 use ratatui::layout::Rect;
 use yazi_config::PREVIEW;
 
-use crate::{CLOSE, ESCAPE, Emulator, Image, START, adapter::Adapter};
+use crate::{CLOSE, ESCAPE, Emulator, Image, Offset, START, adapter::Adapter};
 
 pub(crate) struct Sixel;
 
 impl Sixel {
-	pub(crate) async fn image_show(path: &Path, max: Rect) -> Result<Rect> {
+	pub(crate) async fn image_show(path: &Path, max: Rect, offset: Option<Offset>) -> Result<Rect> {
 		let img = Image::downscale(path, max).await?;
-		let area = Image::pixel_area((img.width(), img.height()), max);
+		let area = Image::pixel_area((img.width(), img.height()), max, offset);
 		let b = Self::encode(img).await?;
 
 		Adapter::Sixel.image_hide()?;

yazi-adapter/src/drivers/ueberzug.rs

@@ -1,13 +1,13 @@
 use std::{path::{Path, PathBuf}, process::Stdio};
 
 use anyhow::{Result, bail};
-use ratatui::layout::Rect;
+use ratatui::layout::{Rect, Size};
 use tokio::{io::AsyncWriteExt, process::{Child, Command}, sync::mpsc::{self, UnboundedSender}};
 use tracing::{debug, warn};
 use yazi_config::PREVIEW;
 use yazi_shared::{RoCell, env_exists};
 
-use crate::{Adapter, Dimension};
+use crate::{Adapter, Dimension, Offset};
 
 type Cmd = Option<(PathBuf, Rect)>;
 
@@ -41,7 +41,7 @@ impl Ueberzug {
 		DEMON.init(Some(tx))
 	}
 
-	pub(crate) async fn image_show(path: &Path, max: Rect) -> Result<Rect> {
+	pub(crate) async fn image_show(path: &Path, max: Rect, offset: Option<Offset>) -> Result<Rect> {
 		let Some(tx) = &*DEMON else {
 			bail!("uninitialized ueberzugpp");
 		};
@@ -50,11 +50,13 @@ impl Ueberzug {
 		let (w, h) = tokio::task::spawn_blocking(move || image::image_dimensions(p)).await??;
 
 		let area = Dimension::ratio()
-			.map(|(r1, r2)| Rect {
-				x:      max.x,
-				y:      max.y,
-				width:  max.width.min((w.min(PREVIEW.max_width as _) as f64 / r1).ceil() as _),
-				height: max.height.min((h.min(PREVIEW.max_height as _) as f64 / r2).ceil() as _),
+			.map(|(r1, r2)| {
+				let width = max.width.min((w.min(PREVIEW.max_width as _) as f64 / r1).ceil() as _);
+				let height = max.height.min((h.min(PREVIEW.max_height as _) as f64 / r2).ceil() as _);
+				let offset = offset.unwrap_or_else(|| {
+					Offset::from((Size { width, height }, Size { width: max.width, height: max.height }))
+				});
+				Rect { x: max.x + offset.x, y: max.y + offset.y, width, height }
 			})
 			.unwrap_or(max);
 

yazi-adapter/src/image.rs

@@ -2,10 +2,10 @@ use std::path::{Path, PathBuf};
 
 use anyhow::Result;
 use image::{DynamicImage, ExtendedColorType, ImageDecoder, ImageEncoder, ImageError, ImageReader, ImageResult, Limits, codecs::{jpeg::JpegEncoder, png::PngEncoder}, imageops::FilterType, metadata::Orientation};
-use ratatui::layout::Rect;
+use ratatui::layout::{Rect, Size};
 use yazi_config::{PREVIEW, TASKS};
 
-use crate::Dimension;
+use crate::{Dimension, Offset};
 
 pub struct Image;
 
@@ -73,13 +73,15 @@ impl Image {
 			.unwrap_or((PREVIEW.max_width, PREVIEW.max_height))
 	}
 
-	pub(super) fn pixel_area(size: (u32, u32), rect: Rect) -> Rect {
+	pub(super) fn pixel_area(size: (u32, u32), rect: Rect, offset: Option<Offset>) -> Rect {
 		Dimension::ratio()
-			.map(|(r1, r2)| Rect {
-				x:      rect.x,
-				y:      rect.y,
-				width:  (size.0 as f64 / r1).ceil() as u16,
-				height: (size.1 as f64 / r2).ceil() as u16,
+			.map(|(r1, r2)| {
+				let width = (size.0 as f64 / r1).ceil() as u16;
+				let height = (size.1 as f64 / r2).ceil() as u16;
+				let offset = offset.unwrap_or_else(|| {
+					Offset::from((Size { width, height }, Size { width: rect.width, height: rect.height }))
+				});
+				Rect { x: rect.x + offset.x, y: rect.y + offset.y, width, height }
 			})
 			.unwrap_or(rect)
 	}

yazi-adapter/src/lib.rs

@@ -2,7 +2,7 @@
 
 yazi_macro::mod_pub!(drivers);
 
-yazi_macro::mod_flat!(adapter brand dimension emulator image info mux unknown);
+yazi_macro::mod_flat!(adapter brand dimension emulator image info mux offset unknown);
 
 use yazi_shared::{RoCell, SyncCell, env_exists, in_wsl};
 

yazi-adapter/src/offset.rs

@@ -0,0 +1,26 @@
+use ratatui::layout::Size;
+use yazi_config::{PREVIEW, preview::{HorizontalAlignment, VerticalAlignment}};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub struct Offset {
+	pub x: u16,
+	pub y: u16,
+}
+
+impl From<(Size, Size)> for Offset {
+	fn from(value: (Size, Size)) -> Self {
+		let inner = value.0;
+		let outer = value.1;
+		let offset_x = match PREVIEW.alignment.horizontal {
+			HorizontalAlignment::Left => 0,
+			HorizontalAlignment::Center => (outer.width - inner.width) / 2,
+			HorizontalAlignment::Right => outer.width - inner.width,
+		};
+		let offset_y = match PREVIEW.alignment.vertical {
+			VerticalAlignment::Top => 0,
+			VerticalAlignment::Center => (outer.height - inner.height) / 2,
+			VerticalAlignment::Bottom => outer.height - inner.height,
+		};
+		Self { x: offset_x, y: offset_y }
+	}
+}