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//! `Pane::Image` renderer. Reserves the pane area with a dim placeholder
//! background; `tui.rs` emits the terminal-specific image escape after
//! `terminal.draw()` so the image paints on top of the reserved cells.
//!
//! When the terminal doesn't support an image protocol, the body shows
//! the file's metadata + a one-line hint ("preview requires Kitty /
//! iTerm2 protocol") so the user knows what they'd be seeing.
use ratatui::Frame;
use ratatui::layout::Rect;
use ratatui::style::{Modifier, Style};
use ratatui::text::{Line, Span};
use ratatui::widgets::Paragraph;
use crate::app::App;
use crate::image::ImageProtocol;
use crate::layout::PaneId;
use crate::pane::Pane;
use crate::ui::theme;
pub fn draw(
frame: &mut Frame,
app: &mut App,
pane_id: PaneId,
area: Rect,
_focused: bool,
) -> Option<(u16, u16)> {
if area.width == 0 || area.height == 0 {
return None;
}
let t = theme::cur();
let protocol = app.image_protocol;
app.rects.editor_panes.push((area, pane_id));
let Some(Pane::Image(p)) = app.panes.get(pane_id) else {
return None;
};
// Paint the pane background first (so the image overlay has a clean
// canvas; ratatui re-draws will erase whatever stomped over it on the
// previous frame).
frame.render_widget(
Paragraph::new("").style(Style::default().bg(t.bg_dark)),
area,
);
// Optional header row with file metadata.
let header_h: u16 = if p.show_header { 2 } else { 0 };
let header_area = Rect::new(area.x, area.y, area.width, header_h.min(area.height));
let body_area = Rect::new(
area.x,
area.y + header_h.min(area.height),
area.width,
area.height.saturating_sub(header_h),
);
if header_h > 0 {
let size_kb = (p.data.bytes.len() as f64) / 1024.0;
let size_label = if size_kb >= 1024.0 {
format!("{:.1} MB", size_kb / 1024.0)
} else {
format!("{size_kb:.0} KB")
};
let proto_label = match protocol {
ImageProtocol::Kitty => "kitty protocol",
ImageProtocol::Iterm2 => "iterm2 inline",
ImageProtocol::Sixel => "sixel",
ImageProtocol::None => "no inline protocol — metadata only",
};
let rel = p
.data
.path
.strip_prefix(&app.workspace)
.unwrap_or(&p.data.path)
.display()
.to_string();
let header = Paragraph::new(vec![
Line::from(vec![
Span::styled(
rel,
Style::default()
.fg(t.fg)
.bg(t.bg_darker)
.add_modifier(Modifier::BOLD),
),
Span::styled(
format!(" · {size_label} · {proto_label}"),
Style::default().fg(t.comment).bg(t.bg_darker),
),
]),
Line::from(Span::styled(
" i header · r reload · Esc tree",
Style::default().fg(t.comment).bg(t.bg_darker),
)),
])
.style(Style::default().bg(t.bg_darker));
frame.render_widget(header, header_area);
}
// Body: paint a subtle placeholder grid so the user can see the
// reserved area even before the image escape arrives. The image
// overlay paints over this on the next stdout flush.
if body_area.width > 0 && body_area.height > 0 {
match protocol {
ImageProtocol::None => {
// No protocol: explain what's missing rather than leaving
// an empty rectangle.
let dim = Style::default().fg(t.comment).bg(t.bg_dark);
let lines: Vec<Line> = vec![
Line::from(""),
Line::from(Span::styled(
" Image preview requires Kitty, iTerm2, or sixel inline-image protocol.",
dim,
)),
Line::from(""),
Line::from(Span::styled(
" Supported terminals: Kitty, WezTerm, Ghostty, iTerm2, Konsole, foot, mlterm.",
dim,
)),
Line::from(Span::styled(
" Override detection with MNML_IMAGE_PROTOCOL=kitty|iterm2|sixel.",
dim,
)),
];
frame.render_widget(
Paragraph::new(lines).style(Style::default().bg(t.bg_dark)),
body_area,
);
}
_ => {
// Light placeholder dots — the image overlay will paint on
// top of these next frame.
let placeholder: Vec<Line> = (0..body_area.height)
.map(|_| {
Line::from(Span::styled(
" ".repeat(body_area.width as usize),
Style::default().bg(t.bg_dark),
))
})
.collect();
frame.render_widget(
Paragraph::new(placeholder).style(Style::default().bg(t.bg_dark)),
body_area,
);
// Stage a paint request for tui.rs to act on after draw.
// Compute the PNG bytes first (decoding non-PNG sources
// on first access) so the emitter can stay agnostic.
let cell_size = app.cell_pixel_size;
if let Some(Pane::Image(p)) = app.panes.get_mut(pane_id)
&& let Ok(png_bytes) = p.data.ensure_png_bytes()
{
// qa-feature 2026-07-02 — shrink the paint rect to
// preserve the image's aspect ratio inside
// `body_area`. Kitty stretches to fill the
// supplied cols×rows otherwise. When TIOCGWINSZ
// gave us real cell pixel dimensions we use those;
// else we fall back to a rough constant (~2.2 for
// typical macOS monospace fonts) that's usually
// close enough.
let fit_area = if let Some((iw, ih)) = p.data.pixel_size {
fit_area_aspect(body_area, iw, ih, cell_size)
} else {
body_area
};
app.image_paint_requests.push(crate::image::PaintRequest {
pane_id,
area: fit_area,
png_bytes,
});
}
}
}
}
None
}
/// qa-feature 2026-07-02 — compute the largest sub-rect of `body`
/// that preserves the image's aspect ratio. `cell_size` is the
/// terminal's actual cell pixel dimensions (probed via TIOCGWINSZ);
/// when `None`, falls back to a constant that's close for typical
/// macOS monospace fonts.
fn fit_area_aspect(
body: Rect,
img_w_px: u32,
img_h_px: u32,
cell_size: Option<(u16, u16)>,
) -> Rect {
if body.width == 0 || body.height == 0 || img_w_px == 0 || img_h_px == 0 {
return body;
}
// rows/cols needed to preserve aspect = (img_h_px / img_w_px) * (cell_w_px / cell_h_px).
// With a real probe, that's exact. Without one, `~2.2` is a
// decent SF-Mono-on-Ghostty middle ground.
let (cell_w, cell_h) = match cell_size {
Some((w, h)) if w > 0 && h > 0 => (w as f32, h as f32),
_ => (1.0, 2.2),
};
let img_aspect = img_h_px as f32 / img_w_px as f32;
let cells_ratio = img_aspect * (cell_w / cell_h);
let rows_if_full_cols = (body.width as f32 * cells_ratio).round() as u16;
let cols_if_full_rows = (body.height as f32 / cells_ratio).round() as u16;
let (cols, rows) = if rows_if_full_cols <= body.height {
(body.width, rows_if_full_cols.max(1))
} else {
(cols_if_full_rows.max(1), body.height)
};
let x_pad = body.width.saturating_sub(cols) / 2;
let y_pad = body.height.saturating_sub(rows) / 2;
Rect {
x: body.x + x_pad,
y: body.y + y_pad,
width: cols,
height: rows,
}
}