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use {
super::double_line::DoubleLine,
crate::{
app::AppContext,
display::{fill_bg, Screen, W},
errors::ProgramError,
skin::PanelSkin,
},
crossterm::{
cursor,
style::{
Color,
SetBackgroundColor,
},
QueueableCommand,
},
image::{
io::Reader,
DynamicImage,
GenericImageView,
imageops::FilterType,
},
std::path::{Path, PathBuf},
termimad::Area,
};
/// an already resized image, with the dimensions it
/// was computed for (which may be different from the
/// dimensions we got)
struct CachedImage {
img: DynamicImage,
target_width: u32,
target_height: u32,
}
/// an imageview can display an image in the terminal with
/// a ratio of one pixel per char in width.
pub struct ImageView {
path: PathBuf,
source_img: DynamicImage,
display_img: Option<CachedImage>,
}
impl ImageView {
pub fn new(path: &Path) -> Result<Self, ProgramError> {
let source_img = time!(
"decode image",
path,
Reader::open(&path)?.decode()?
);
Ok(Self {
path: path.to_path_buf(),
source_img,
display_img: None,
})
}
pub fn is_png(&self) -> bool {
match self.path.extension() {
Some(ext) => ext == "png" || ext == "PNG",
None => false,
}
}
pub fn display(
&mut self,
w: &mut W,
_screen: Screen,
panel_skin: &PanelSkin,
area: &Area,
con: &AppContext,
) -> Result<(), ProgramError> {
let styles = &panel_skin.styles;
let bg = styles.preview.get_bg()
.or_else(|| styles.default.get_bg())
.unwrap_or(Color::AnsiValue(238));
#[cfg(unix)]
if let Some(renderer) = crate::kitty::image_renderer() {
let mut renderer = renderer.lock().unwrap();
renderer.print(w, &self.source_img, area)?;
for y in area.top..area.top + area.height {
w.queue(cursor::MoveTo(area.left, y))?;
fill_bg(w, area.width as usize, bg)?;
}
return Ok(());
}
let target_width = area.width as u32;
let target_height = (area.height * 2) as u32;
let cached = self
.display_img
.as_ref()
.filter(|ci| ci.target_width == target_width && ci.target_height == target_height);
let img = match cached {
Some(ci) => &ci.img,
None => {
let img = time!(
"resize image",
self.source_img.resize(target_width, target_height, FilterType::Triangle),
);
self.display_img = Some(CachedImage {
img,
target_width,
target_height,
});
&self.display_img.as_ref().unwrap().img
}
};
let (width, height) = img.dimensions();
debug!("resized image dimensions: {},{}", width, height);
debug_assert!(width <= area.width as u32);
let mut double_line = DoubleLine::new(width as usize, con.true_colors);
let mut y = area.top;
let img_top_offset = (area.height - (height / 2) as u16) / 2;
for _ in 0..img_top_offset {
w.queue(cursor::MoveTo(area.left, y))?;
fill_bg(w, area.width as usize, bg)?;
y += 1;
}
let margin = area.width as usize - width as usize;
let left_margin = margin / 2;
let right_margin = margin - left_margin;
w.queue(cursor::MoveTo(area.left, y))?;
for pixel in img.pixels() {
double_line.push(pixel.2);
if double_line.is_full() {
double_line.write(w, left_margin, right_margin, bg)?;
y += 1;
w.queue(cursor::MoveTo(area.left, y))?;
}
}
if !double_line.is_empty() {
double_line.write(w, left_margin, right_margin, bg)?;
y += 1;
}
w.queue(SetBackgroundColor(bg))?;
for y in y..area.top + area.height {
w.queue(cursor::MoveTo(area.left, y))?;
fill_bg(w, area.width as usize, bg)?;
}
Ok(())
}
pub fn display_info(
&mut self,
w: &mut W,
_screen: Screen,
panel_skin: &PanelSkin,
area: &Area,
) -> Result<(), ProgramError> {
let dim = self.source_img.dimensions();
let s = format!("{} x {}", dim.0, dim.1);
if s.len() > area.width as usize {
return Ok(());
}
w.queue(cursor::MoveTo(
area.left + area.width - s.len() as u16,
area.top,
))?;
panel_skin.styles.default.queue(w, s)?;
Ok(())
}
}
|
