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use {
super::double_line::DoubleLine,
crate::{
app::*,
display::{Screen, W},
errors::ProgramError,
kitty::{self, KittyImageId},
skin::PanelSkin,
},
crokey::crossterm::{
cursor,
style::{
Color,
SetBackgroundColor,
},
QueueableCommand,
},
image::{
io::Reader,
DynamicImage,
GenericImageView,
imageops::FilterType,
},
std::path::{Path, PathBuf},
termimad::{fill_bg, Area},
};
#[derive(Debug)]
struct DrawingInfo {
drawing_count: usize,
area: Area,
}
impl DrawingInfo {
pub fn follows_in_place(&self, previous: &DrawingInfo) -> bool {
self.drawing_count == previous.drawing_count + 1
&& self.area == previous.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>,
last_drawing: Option<DrawingInfo>,
kitty_image_id: Option<KittyImageId>,
}
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,
last_drawing: None,
kitty_image_id: 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,
disc: &DisplayContext,
area: &Area,
) -> Result<(), ProgramError> {
let styles = &disc.panel_skin.styles;
let bg = styles.preview.get_bg()
.or_else(|| styles.default.get_bg())
.unwrap_or(Color::AnsiValue(238));
// we avoid drawing when we were just displayed
// on the last drawing_count and the area is the same.
let drawing_info = DrawingInfo {
drawing_count: disc.count,
area: area.clone(),
};
let must_draw = self.last_drawing
.as_ref()
.map_or(true, |previous| !drawing_info.follows_in_place(previous));
if must_draw {
debug!("image_view must be cleared");
} else {
debug!("no need to clear image_view");
}
self.last_drawing = Some(drawing_info);
let mut kitty_manager = kitty::manager().lock().unwrap();
if !must_draw {
if let Some(kitty_image_id) = self.kitty_image_id {
// we tell the manager the images must be kept, otherwise
// they would be erased at end of drawing, as obsolete
kitty_manager.keep(kitty_image_id, disc.count);
}
return Ok(());
}
self.kitty_image_id = kitty_manager
.try_print_image(w, &self.source_img, area, bg, disc.count)?;
if self.kitty_image_id.is_some() {
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, disc.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(())
}
}
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