ratatui_image::picker

Struct Picker

Source 
pub struct Picker { /* private fields */ }

Implementations§

Source§

impl Picker

Helper for building widgets

Source

pub fn from_query_stdio() -> Result<Picker, Errors>

Query terminal stdio for graphics capabilities and font-size with some escape sequences.

This writes and reads from stdio momentarily. WARNING: this method should be called after entering alternate screen but before reading terminal events.

§Example
use ratatui_image::picker::Picker;
let mut picker = Picker::from_query_stdio();
Examples found in repository?
examples/screenshot.rs (line 38)
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
fn main() -> Result<(), Box<dyn std::error::Error>> {
    // setup terminal
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(
        stdout,
        EnterAlternateScreen,
        SetSize(SCREEN_SIZE.0, SCREEN_SIZE.1)
    )?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    let mut picker = Picker::from_query_stdio()?;
    picker.set_background_color([255, 0, 255, 255]);
    if false {
        assert_eq!(
            ASSERT_FONT_SIZE,
            picker.font_size(),
            "Font size must be fixed to a specific size: {ASSERT_FONT_SIZE:?}",
        );
    }
    let dyn_img = image::io::Reader::open("./assets/Ada.png")?.decode()?;
    let image = picker.new_protocol(
        dyn_img,
        Rect::new(0, 0, SCREEN_SIZE.0 - 10, SCREEN_SIZE.1 - 4),
        Resize::Fit(None),
    )?;
    let mut app = App { image };

    terminal.draw(|f| ui(f, &mut app))?;
    std::thread::sleep(std::time::Duration::from_secs(1)); // let the terminal actually draw.
    let xwd = Command::new("xwd")
        .args(["-root", "-silent"])
        .stdout(Stdio::piped())
        .spawn()
        .expect("Failed to start xwd command");
    let screenshot_term = env::var("SCREENSHOT_TERM_NAME").unwrap_or("unknown".to_string());
    std::process::Command::new("convert")
        .args([
            "xwd:-",
            &format!("png:./target/screenshot_{screenshot_term}.png"),
        ])
        .stdin(xwd.stdout.expect("failed to get stdout"))
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .spawn()
        .and_then(|mut child| child.wait())?;

    // restore terminal
    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
    terminal.show_cursor()?;

    Ok(())
}
More examples
Hide additional examples
examples/demo/main.rs (line 82)
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
    pub fn new<B: Backend>(_: &mut Terminal<B>) -> Self {
        let title = format!(
            "Demo ({})",
            env::var("TERM").unwrap_or("unknown".to_string())
        );

        let ada = "./assets/Ada.png";
        let image_source = image::io::Reader::open(ada).unwrap().decode().unwrap();

        let mut picker = Picker::from_query_stdio().unwrap();
        // Set completely transparent background (experimental, only works for iTerm2 and Kitty).
        picker.set_background_color([0, 0, 0, 0]);

        let image_static = picker
            .new_protocol(image_source.clone(), size(), Resize::Fit(None))
            .unwrap();
        let image_fit_state = picker.new_resize_protocol(image_source.clone());
        let image_crop_state = picker.new_resize_protocol(image_source.clone());
        let image_scale_state = picker.new_resize_protocol(image_source.clone());

        let mut background = String::new();

        let mut r: [u64; 2] = [0x8a5cd789635d2dff, 0x121fd2155c472f96];
        for _ in 0..5_000 {
            let mut s1 = w(r[0]);
            let s0 = w(r[1]);
            let result = s0 + s1;
            r[0] = s0.0;
            s1 ^= s1 << 23;
            r[1] = (s1 ^ s0 ^ (s1 >> 18) ^ (s0 >> 5)).0;
            let c = match result.0 % 4 {
                0 => '.',
                1 => ' ',
                _ => '…',
            };
            background.push(c);
        }

        Self {
            title,
            should_quit: false,
            tick_rate: Duration::from_millis(1000),
            background,
            show_images: ShowImages::All,
            split_percent: 70,
            picker,
            image_source,
            image_source_path: ada.into(),

            image_static,
            image_fit_state,
            image_crop_state,
            image_scale_state,

            image_static_offset: (0, 0),
        }
    }
examples/async.rs (line 43)
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
fn main() -> Result<(), Box<dyn std::error::Error>> {
    // setup terminal
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(stdout, EnterAlternateScreen,)?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    let mut picker = Picker::from_query_stdio()?;
    let dyn_img = image::io::Reader::open("./assets/Ada.png")?.decode()?;

    // Send a [ResizeProtocol] to resize and encode it in a separate thread.
    let (tx_worker, rec_worker) = mpsc::channel::<(StatefulProtocol, Resize, Rect)>();

    // Send UI-events and the [ResizeProtocol] result back to main thread.
    let (tx_main, rec_main) = mpsc::channel();

    // Resize and encode in background thread.
    let tx_main_render = tx_main.clone();
    thread::spawn(move || loop {
        if let Ok((mut protocol, resize, area)) = rec_worker.recv() {
            protocol.resize_encode(&resize, protocol.background_color(), area);
            tx_main_render.send(AppEvent::Redraw(protocol)).unwrap();
        }
    });

    // Poll events in background thread to demonstrate polling terminal events and redraw events
    // concurrently. It's not required to do it this way - the "redraw event" from the channel
    // could be read after polling the terminal events (as long as it's done with a timout). But
    // then the rendering of the image will always be somewhat delayed.
    let tx_main_events = tx_main.clone();
    thread::spawn(move || -> Result<(), std::io::Error> {
        loop {
            if ratatui::crossterm::event::poll(Duration::from_millis(1000))? {
                if let Event::Key(key) = event::read()? {
                    tx_main_events.send(AppEvent::KeyEvent(key)).unwrap();
                }
            }
        }
    });

    let mut app = App {
        async_state: ThreadProtocol::new(tx_worker, picker.new_resize_protocol(dyn_img)),
    };

    loop {
        terminal.draw(|f| ui(f, &mut app))?;

        if let Ok(ev) = rec_main.try_recv() {
            match ev {
                AppEvent::KeyEvent(key) => {
                    if key.kind == KeyEventKind::Press {
                        if key.code == KeyCode::Char('q') {
                            break;
                        }
                    }
                }
                AppEvent::Redraw(protocol) => {
                    app.async_state.set_protocol(protocol);
                }
            }
        }
    }

    // restore terminal
    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
    terminal.show_cursor()?;

    Ok(())
}
Source

pub fn from_fontsize(font_size: FontSize) -> Picker

Create a picker from a given terminal FontSize. This is the only way to create a picker on windows, for now.

§Example
use ratatui_image::picker::Picker;

let user_fontsize = (7, 14);

let mut picker = Picker::from_fontsize(user_fontsize);
Source

pub fn protocol_type(self) -> ProtocolType

Examples found in repository?
examples/demo/main.rs (line 144)
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
    pub fn on_key(&mut self, c: char) {
        match c {
            'q' => {
                self.should_quit = true;
            }
            't' => {
                self.show_images = match self.show_images {
                    ShowImages::All => ShowImages::Fixed,
                    ShowImages::Fixed => ShowImages::Resized,
                    ShowImages::Resized => ShowImages::All,
                }
            }
            'i' => {
                self.picker
                    .set_protocol_type(self.picker.protocol_type().next());
                self.reset_images();
            }
            'o' => {
                let path = match self.image_source_path.to_str() {
                    Some("./assets/Ada.png") => "./assets/Jenkins.jpg",
                    Some("./assets/Jenkins.jpg") => "./assets/NixOS.png",
                    _ => "./assets/Ada.png",
                };
                self.image_source = image::io::Reader::open(path).unwrap().decode().unwrap();
                self.image_source_path = path.into();
                self.reset_images();
            }
            'H' => {
                if self.split_percent >= 10 {
                    self.split_percent -= 10;
                }
            }
            'L' => {
                if self.split_percent <= 90 {
                    self.split_percent += 10;
                }
            }
            'h' => {
                if self.image_static_offset.0 > 0 {
                    self.image_static_offset.0 -= 1;
                }
            }
            'j' => {
                self.image_static_offset.1 += 1;
            }
            'k' => {
                if self.image_static_offset.1 > 0 {
                    self.image_static_offset.1 -= 1;
                }
            }
            'l' => {
                self.image_static_offset.0 += 1;
            }
            _ => {}
        }
    }

    fn reset_images(&mut self) {
        self.image_static = self
            .picker
            .new_protocol(self.image_source.clone(), size(), Resize::Fit(None))
            .unwrap();
        self.image_fit_state = self.picker.new_resize_protocol(self.image_source.clone());
        self.image_crop_state = self.picker.new_resize_protocol(self.image_source.clone());
        self.image_scale_state = self.picker.new_resize_protocol(self.image_source.clone());
    }

    pub fn on_tick(&mut self) {}

    fn render_resized_image(&mut self, f: &mut Frame<'_>, resize: Resize, area: Rect) {
        let (state, name, color) = match resize {
            Resize::Fit(_) => (&mut self.image_fit_state, "Fit", Color::Magenta),
            Resize::Crop(_) => (&mut self.image_crop_state, "Crop", Color::Green),
            Resize::Scale(_) => (&mut self.image_scale_state, "Scale", Color::Blue),
        };
        let block = block(name);
        let inner_area = block.inner(area);
        f.render_widget(paragraph(self.background.as_str().bg(color)), inner_area);
        match self.show_images {
            ShowImages::Fixed => (),
            _ => {
                let image = StatefulImage::default().resize(resize);
                f.render_stateful_widget(image, inner_area, state);
            }
        };
        f.render_widget(block, area);
    }
}

fn ui(f: &mut Frame<'_>, app: &mut App) {
    let outer_block = Block::default()
        .borders(Borders::TOP)
        .title(app.title.as_str());

    let chunks = Layout::default()
        .direction(Direction::Horizontal)
        .constraints(
            [
                Constraint::Percentage(app.split_percent),
                Constraint::Percentage(100 - app.split_percent),
            ]
            .as_ref(),
        )
        .split(outer_block.inner(f.area()));
    f.render_widget(outer_block, f.area());

    let left_chunks = vertical_layout().split(chunks[0]);
    let right_chunks = vertical_layout().split(chunks[1]);

    let block_left_top = block("Fixed");
    let area = block_left_top.inner(left_chunks[0]);
    f.render_widget(
        paragraph(app.background.as_str()).style(Color::Yellow),
        area,
    );
    f.render_widget(block_left_top, left_chunks[0]);
    match app.show_images {
        ShowImages::Resized => {}
        _ => {
            let image = Image::new(&mut app.image_static);
            // Let it be surrounded by styled text.
            let offset_area = Rect {
                x: area.x + 1,
                y: area.y + 1,
                width: area.width.saturating_sub(2),
                height: area.height.saturating_sub(2),
            };
            f.render_widget(image, offset_area);
        }
    }

    let chunks_left_bottom = Layout::default()
        .direction(Direction::Horizontal)
        .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
        .split(left_chunks[1]);

    app.render_resized_image(f, Resize::Crop(None), chunks_left_bottom[0]);
    app.render_resized_image(f, Resize::Scale(None), chunks_left_bottom[1]);
    app.render_resized_image(f, Resize::Fit(None), right_chunks[0]);

    let block_right_bottom = block("Help");
    let area = block_right_bottom.inner(right_chunks[1]);
    f.render_widget(
        paragraph(vec![
            Line::from("Key bindings:"),
            Line::from("H/L: resize"),
            Line::from(format!(
                "i: cycle image protocols (current: {:?})",
                app.picker.protocol_type()
            )),
            Line::from("o: cycle image"),
            Line::from(format!("t: toggle ({:?})", app.show_images)),
            Line::from(format!("Font size: {:?}", app.picker.font_size())),
        ]),
        area,
    );
    f.render_widget(block_right_bottom, right_chunks[1]);
}
Source

pub fn set_protocol_type(&mut self, protocol_type: ProtocolType)

Examples found in repository?
examples/demo/main.rs (line 144)
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
    pub fn on_key(&mut self, c: char) {
        match c {
            'q' => {
                self.should_quit = true;
            }
            't' => {
                self.show_images = match self.show_images {
                    ShowImages::All => ShowImages::Fixed,
                    ShowImages::Fixed => ShowImages::Resized,
                    ShowImages::Resized => ShowImages::All,
                }
            }
            'i' => {
                self.picker
                    .set_protocol_type(self.picker.protocol_type().next());
                self.reset_images();
            }
            'o' => {
                let path = match self.image_source_path.to_str() {
                    Some("./assets/Ada.png") => "./assets/Jenkins.jpg",
                    Some("./assets/Jenkins.jpg") => "./assets/NixOS.png",
                    _ => "./assets/Ada.png",
                };
                self.image_source = image::io::Reader::open(path).unwrap().decode().unwrap();
                self.image_source_path = path.into();
                self.reset_images();
            }
            'H' => {
                if self.split_percent >= 10 {
                    self.split_percent -= 10;
                }
            }
            'L' => {
                if self.split_percent <= 90 {
                    self.split_percent += 10;
                }
            }
            'h' => {
                if self.image_static_offset.0 > 0 {
                    self.image_static_offset.0 -= 1;
                }
            }
            'j' => {
                self.image_static_offset.1 += 1;
            }
            'k' => {
                if self.image_static_offset.1 > 0 {
                    self.image_static_offset.1 -= 1;
                }
            }
            'l' => {
                self.image_static_offset.0 += 1;
            }
            _ => {}
        }
    }
Source

pub fn font_size(self) -> FontSize

Examples found in repository?
examples/screenshot.rs (line 43)
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
fn main() -> Result<(), Box<dyn std::error::Error>> {
    // setup terminal
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(
        stdout,
        EnterAlternateScreen,
        SetSize(SCREEN_SIZE.0, SCREEN_SIZE.1)
    )?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    let mut picker = Picker::from_query_stdio()?;
    picker.set_background_color([255, 0, 255, 255]);
    if false {
        assert_eq!(
            ASSERT_FONT_SIZE,
            picker.font_size(),
            "Font size must be fixed to a specific size: {ASSERT_FONT_SIZE:?}",
        );
    }
    let dyn_img = image::io::Reader::open("./assets/Ada.png")?.decode()?;
    let image = picker.new_protocol(
        dyn_img,
        Rect::new(0, 0, SCREEN_SIZE.0 - 10, SCREEN_SIZE.1 - 4),
        Resize::Fit(None),
    )?;
    let mut app = App { image };

    terminal.draw(|f| ui(f, &mut app))?;
    std::thread::sleep(std::time::Duration::from_secs(1)); // let the terminal actually draw.
    let xwd = Command::new("xwd")
        .args(["-root", "-silent"])
        .stdout(Stdio::piped())
        .spawn()
        .expect("Failed to start xwd command");
    let screenshot_term = env::var("SCREENSHOT_TERM_NAME").unwrap_or("unknown".to_string());
    std::process::Command::new("convert")
        .args([
            "xwd:-",
            &format!("png:./target/screenshot_{screenshot_term}.png"),
        ])
        .stdin(xwd.stdout.expect("failed to get stdout"))
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .spawn()
        .and_then(|mut child| child.wait())?;

    // restore terminal
    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
    terminal.show_cursor()?;

    Ok(())
}
More examples
Hide additional examples
examples/demo/main.rs (line 282)
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
fn ui(f: &mut Frame<'_>, app: &mut App) {
    let outer_block = Block::default()
        .borders(Borders::TOP)
        .title(app.title.as_str());

    let chunks = Layout::default()
        .direction(Direction::Horizontal)
        .constraints(
            [
                Constraint::Percentage(app.split_percent),
                Constraint::Percentage(100 - app.split_percent),
            ]
            .as_ref(),
        )
        .split(outer_block.inner(f.area()));
    f.render_widget(outer_block, f.area());

    let left_chunks = vertical_layout().split(chunks[0]);
    let right_chunks = vertical_layout().split(chunks[1]);

    let block_left_top = block("Fixed");
    let area = block_left_top.inner(left_chunks[0]);
    f.render_widget(
        paragraph(app.background.as_str()).style(Color::Yellow),
        area,
    );
    f.render_widget(block_left_top, left_chunks[0]);
    match app.show_images {
        ShowImages::Resized => {}
        _ => {
            let image = Image::new(&mut app.image_static);
            // Let it be surrounded by styled text.
            let offset_area = Rect {
                x: area.x + 1,
                y: area.y + 1,
                width: area.width.saturating_sub(2),
                height: area.height.saturating_sub(2),
            };
            f.render_widget(image, offset_area);
        }
    }

    let chunks_left_bottom = Layout::default()
        .direction(Direction::Horizontal)
        .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
        .split(left_chunks[1]);

    app.render_resized_image(f, Resize::Crop(None), chunks_left_bottom[0]);
    app.render_resized_image(f, Resize::Scale(None), chunks_left_bottom[1]);
    app.render_resized_image(f, Resize::Fit(None), right_chunks[0]);

    let block_right_bottom = block("Help");
    let area = block_right_bottom.inner(right_chunks[1]);
    f.render_widget(
        paragraph(vec![
            Line::from("Key bindings:"),
            Line::from("H/L: resize"),
            Line::from(format!(
                "i: cycle image protocols (current: {:?})",
                app.picker.protocol_type()
            )),
            Line::from("o: cycle image"),
            Line::from(format!("t: toggle ({:?})", app.show_images)),
            Line::from(format!("Font size: {:?}", app.picker.font_size())),
        ]),
        area,
    );
    f.render_widget(block_right_bottom, right_chunks[1]);
}
Source

pub fn set_background_color<T: Into<Rgba<u8>>>(&mut self, background_color: T)

Examples found in repository?
examples/screenshot.rs (line 39)
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
fn main() -> Result<(), Box<dyn std::error::Error>> {
    // setup terminal
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(
        stdout,
        EnterAlternateScreen,
        SetSize(SCREEN_SIZE.0, SCREEN_SIZE.1)
    )?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    let mut picker = Picker::from_query_stdio()?;
    picker.set_background_color([255, 0, 255, 255]);
    if false {
        assert_eq!(
            ASSERT_FONT_SIZE,
            picker.font_size(),
            "Font size must be fixed to a specific size: {ASSERT_FONT_SIZE:?}",
        );
    }
    let dyn_img = image::io::Reader::open("./assets/Ada.png")?.decode()?;
    let image = picker.new_protocol(
        dyn_img,
        Rect::new(0, 0, SCREEN_SIZE.0 - 10, SCREEN_SIZE.1 - 4),
        Resize::Fit(None),
    )?;
    let mut app = App { image };

    terminal.draw(|f| ui(f, &mut app))?;
    std::thread::sleep(std::time::Duration::from_secs(1)); // let the terminal actually draw.
    let xwd = Command::new("xwd")
        .args(["-root", "-silent"])
        .stdout(Stdio::piped())
        .spawn()
        .expect("Failed to start xwd command");
    let screenshot_term = env::var("SCREENSHOT_TERM_NAME").unwrap_or("unknown".to_string());
    std::process::Command::new("convert")
        .args([
            "xwd:-",
            &format!("png:./target/screenshot_{screenshot_term}.png"),
        ])
        .stdin(xwd.stdout.expect("failed to get stdout"))
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .spawn()
        .and_then(|mut child| child.wait())?;

    // restore terminal
    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
    terminal.show_cursor()?;

    Ok(())
}
More examples
Hide additional examples
examples/demo/main.rs (line 84)
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
    pub fn new<B: Backend>(_: &mut Terminal<B>) -> Self {
        let title = format!(
            "Demo ({})",
            env::var("TERM").unwrap_or("unknown".to_string())
        );

        let ada = "./assets/Ada.png";
        let image_source = image::io::Reader::open(ada).unwrap().decode().unwrap();

        let mut picker = Picker::from_query_stdio().unwrap();
        // Set completely transparent background (experimental, only works for iTerm2 and Kitty).
        picker.set_background_color([0, 0, 0, 0]);

        let image_static = picker
            .new_protocol(image_source.clone(), size(), Resize::Fit(None))
            .unwrap();
        let image_fit_state = picker.new_resize_protocol(image_source.clone());
        let image_crop_state = picker.new_resize_protocol(image_source.clone());
        let image_scale_state = picker.new_resize_protocol(image_source.clone());

        let mut background = String::new();

        let mut r: [u64; 2] = [0x8a5cd789635d2dff, 0x121fd2155c472f96];
        for _ in 0..5_000 {
            let mut s1 = w(r[0]);
            let s0 = w(r[1]);
            let result = s0 + s1;
            r[0] = s0.0;
            s1 ^= s1 << 23;
            r[1] = (s1 ^ s0 ^ (s1 >> 18) ^ (s0 >> 5)).0;
            let c = match result.0 % 4 {
                0 => '.',
                1 => ' ',
                _ => '…',
            };
            background.push(c);
        }

        Self {
            title,
            should_quit: false,
            tick_rate: Duration::from_millis(1000),
            background,
            show_images: ShowImages::All,
            split_percent: 70,
            picker,
            image_source,
            image_source_path: ada.into(),

            image_static,
            image_fit_state,
            image_crop_state,
            image_scale_state,

            image_static_offset: (0, 0),
        }
    }
Source

pub fn new_protocol( &mut self, image: DynamicImage, size: Rect, resize: Resize, ) -> Result<Protocol, Errors>

Returns a new protocol for crate::Image widgets that fits into the given size.

Examples found in repository?
examples/screenshot.rs (lines 48-52)
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
fn main() -> Result<(), Box<dyn std::error::Error>> {
    // setup terminal
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(
        stdout,
        EnterAlternateScreen,
        SetSize(SCREEN_SIZE.0, SCREEN_SIZE.1)
    )?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    let mut picker = Picker::from_query_stdio()?;
    picker.set_background_color([255, 0, 255, 255]);
    if false {
        assert_eq!(
            ASSERT_FONT_SIZE,
            picker.font_size(),
            "Font size must be fixed to a specific size: {ASSERT_FONT_SIZE:?}",
        );
    }
    let dyn_img = image::io::Reader::open("./assets/Ada.png")?.decode()?;
    let image = picker.new_protocol(
        dyn_img,
        Rect::new(0, 0, SCREEN_SIZE.0 - 10, SCREEN_SIZE.1 - 4),
        Resize::Fit(None),
    )?;
    let mut app = App { image };

    terminal.draw(|f| ui(f, &mut app))?;
    std::thread::sleep(std::time::Duration::from_secs(1)); // let the terminal actually draw.
    let xwd = Command::new("xwd")
        .args(["-root", "-silent"])
        .stdout(Stdio::piped())
        .spawn()
        .expect("Failed to start xwd command");
    let screenshot_term = env::var("SCREENSHOT_TERM_NAME").unwrap_or("unknown".to_string());
    std::process::Command::new("convert")
        .args([
            "xwd:-",
            &format!("png:./target/screenshot_{screenshot_term}.png"),
        ])
        .stdin(xwd.stdout.expect("failed to get stdout"))
        .stdout(std::process::Stdio::null())
        .stderr(std::process::Stdio::null())
        .spawn()
        .and_then(|mut child| child.wait())?;

    // restore terminal
    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
    terminal.show_cursor()?;

    Ok(())
}
More examples
Hide additional examples
examples/demo/main.rs (line 87)
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
    pub fn new<B: Backend>(_: &mut Terminal<B>) -> Self {
        let title = format!(
            "Demo ({})",
            env::var("TERM").unwrap_or("unknown".to_string())
        );

        let ada = "./assets/Ada.png";
        let image_source = image::io::Reader::open(ada).unwrap().decode().unwrap();

        let mut picker = Picker::from_query_stdio().unwrap();
        // Set completely transparent background (experimental, only works for iTerm2 and Kitty).
        picker.set_background_color([0, 0, 0, 0]);

        let image_static = picker
            .new_protocol(image_source.clone(), size(), Resize::Fit(None))
            .unwrap();
        let image_fit_state = picker.new_resize_protocol(image_source.clone());
        let image_crop_state = picker.new_resize_protocol(image_source.clone());
        let image_scale_state = picker.new_resize_protocol(image_source.clone());

        let mut background = String::new();

        let mut r: [u64; 2] = [0x8a5cd789635d2dff, 0x121fd2155c472f96];
        for _ in 0..5_000 {
            let mut s1 = w(r[0]);
            let s0 = w(r[1]);
            let result = s0 + s1;
            r[0] = s0.0;
            s1 ^= s1 << 23;
            r[1] = (s1 ^ s0 ^ (s1 >> 18) ^ (s0 >> 5)).0;
            let c = match result.0 % 4 {
                0 => '.',
                1 => ' ',
                _ => '…',
            };
            background.push(c);
        }

        Self {
            title,
            should_quit: false,
            tick_rate: Duration::from_millis(1000),
            background,
            show_images: ShowImages::All,
            split_percent: 70,
            picker,
            image_source,
            image_source_path: ada.into(),

            image_static,
            image_fit_state,
            image_crop_state,
            image_scale_state,

            image_static_offset: (0, 0),
        }
    }
    pub fn on_key(&mut self, c: char) {
        match c {
            'q' => {
                self.should_quit = true;
            }
            't' => {
                self.show_images = match self.show_images {
                    ShowImages::All => ShowImages::Fixed,
                    ShowImages::Fixed => ShowImages::Resized,
                    ShowImages::Resized => ShowImages::All,
                }
            }
            'i' => {
                self.picker
                    .set_protocol_type(self.picker.protocol_type().next());
                self.reset_images();
            }
            'o' => {
                let path = match self.image_source_path.to_str() {
                    Some("./assets/Ada.png") => "./assets/Jenkins.jpg",
                    Some("./assets/Jenkins.jpg") => "./assets/NixOS.png",
                    _ => "./assets/Ada.png",
                };
                self.image_source = image::io::Reader::open(path).unwrap().decode().unwrap();
                self.image_source_path = path.into();
                self.reset_images();
            }
            'H' => {
                if self.split_percent >= 10 {
                    self.split_percent -= 10;
                }
            }
            'L' => {
                if self.split_percent <= 90 {
                    self.split_percent += 10;
                }
            }
            'h' => {
                if self.image_static_offset.0 > 0 {
                    self.image_static_offset.0 -= 1;
                }
            }
            'j' => {
                self.image_static_offset.1 += 1;
            }
            'k' => {
                if self.image_static_offset.1 > 0 {
                    self.image_static_offset.1 -= 1;
                }
            }
            'l' => {
                self.image_static_offset.0 += 1;
            }
            _ => {}
        }
    }

    fn reset_images(&mut self) {
        self.image_static = self
            .picker
            .new_protocol(self.image_source.clone(), size(), Resize::Fit(None))
            .unwrap();
        self.image_fit_state = self.picker.new_resize_protocol(self.image_source.clone());
        self.image_crop_state = self.picker.new_resize_protocol(self.image_source.clone());
        self.image_scale_state = self.picker.new_resize_protocol(self.image_source.clone());
    }
Source

pub fn new_resize_protocol(&mut self, image: DynamicImage) -> StatefulProtocol

Returns a new stateful protocol for crate::StatefulImage widgets.

Examples found in repository?
examples/demo/main.rs (line 89)
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
    pub fn new<B: Backend>(_: &mut Terminal<B>) -> Self {
        let title = format!(
            "Demo ({})",
            env::var("TERM").unwrap_or("unknown".to_string())
        );

        let ada = "./assets/Ada.png";
        let image_source = image::io::Reader::open(ada).unwrap().decode().unwrap();

        let mut picker = Picker::from_query_stdio().unwrap();
        // Set completely transparent background (experimental, only works for iTerm2 and Kitty).
        picker.set_background_color([0, 0, 0, 0]);

        let image_static = picker
            .new_protocol(image_source.clone(), size(), Resize::Fit(None))
            .unwrap();
        let image_fit_state = picker.new_resize_protocol(image_source.clone());
        let image_crop_state = picker.new_resize_protocol(image_source.clone());
        let image_scale_state = picker.new_resize_protocol(image_source.clone());

        let mut background = String::new();

        let mut r: [u64; 2] = [0x8a5cd789635d2dff, 0x121fd2155c472f96];
        for _ in 0..5_000 {
            let mut s1 = w(r[0]);
            let s0 = w(r[1]);
            let result = s0 + s1;
            r[0] = s0.0;
            s1 ^= s1 << 23;
            r[1] = (s1 ^ s0 ^ (s1 >> 18) ^ (s0 >> 5)).0;
            let c = match result.0 % 4 {
                0 => '.',
                1 => ' ',
                _ => '…',
            };
            background.push(c);
        }

        Self {
            title,
            should_quit: false,
            tick_rate: Duration::from_millis(1000),
            background,
            show_images: ShowImages::All,
            split_percent: 70,
            picker,
            image_source,
            image_source_path: ada.into(),

            image_static,
            image_fit_state,
            image_crop_state,
            image_scale_state,

            image_static_offset: (0, 0),
        }
    }
    pub fn on_key(&mut self, c: char) {
        match c {
            'q' => {
                self.should_quit = true;
            }
            't' => {
                self.show_images = match self.show_images {
                    ShowImages::All => ShowImages::Fixed,
                    ShowImages::Fixed => ShowImages::Resized,
                    ShowImages::Resized => ShowImages::All,
                }
            }
            'i' => {
                self.picker
                    .set_protocol_type(self.picker.protocol_type().next());
                self.reset_images();
            }
            'o' => {
                let path = match self.image_source_path.to_str() {
                    Some("./assets/Ada.png") => "./assets/Jenkins.jpg",
                    Some("./assets/Jenkins.jpg") => "./assets/NixOS.png",
                    _ => "./assets/Ada.png",
                };
                self.image_source = image::io::Reader::open(path).unwrap().decode().unwrap();
                self.image_source_path = path.into();
                self.reset_images();
            }
            'H' => {
                if self.split_percent >= 10 {
                    self.split_percent -= 10;
                }
            }
            'L' => {
                if self.split_percent <= 90 {
                    self.split_percent += 10;
                }
            }
            'h' => {
                if self.image_static_offset.0 > 0 {
                    self.image_static_offset.0 -= 1;
                }
            }
            'j' => {
                self.image_static_offset.1 += 1;
            }
            'k' => {
                if self.image_static_offset.1 > 0 {
                    self.image_static_offset.1 -= 1;
                }
            }
            'l' => {
                self.image_static_offset.0 += 1;
            }
            _ => {}
        }
    }

    fn reset_images(&mut self) {
        self.image_static = self
            .picker
            .new_protocol(self.image_source.clone(), size(), Resize::Fit(None))
            .unwrap();
        self.image_fit_state = self.picker.new_resize_protocol(self.image_source.clone());
        self.image_crop_state = self.picker.new_resize_protocol(self.image_source.clone());
        self.image_scale_state = self.picker.new_resize_protocol(self.image_source.clone());
    }
More examples
Hide additional examples
examples/async.rs (line 77)
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
fn main() -> Result<(), Box<dyn std::error::Error>> {
    // setup terminal
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(stdout, EnterAlternateScreen,)?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    let mut picker = Picker::from_query_stdio()?;
    let dyn_img = image::io::Reader::open("./assets/Ada.png")?.decode()?;

    // Send a [ResizeProtocol] to resize and encode it in a separate thread.
    let (tx_worker, rec_worker) = mpsc::channel::<(StatefulProtocol, Resize, Rect)>();

    // Send UI-events and the [ResizeProtocol] result back to main thread.
    let (tx_main, rec_main) = mpsc::channel();

    // Resize and encode in background thread.
    let tx_main_render = tx_main.clone();
    thread::spawn(move || loop {
        if let Ok((mut protocol, resize, area)) = rec_worker.recv() {
            protocol.resize_encode(&resize, protocol.background_color(), area);
            tx_main_render.send(AppEvent::Redraw(protocol)).unwrap();
        }
    });

    // Poll events in background thread to demonstrate polling terminal events and redraw events
    // concurrently. It's not required to do it this way - the "redraw event" from the channel
    // could be read after polling the terminal events (as long as it's done with a timout). But
    // then the rendering of the image will always be somewhat delayed.
    let tx_main_events = tx_main.clone();
    thread::spawn(move || -> Result<(), std::io::Error> {
        loop {
            if ratatui::crossterm::event::poll(Duration::from_millis(1000))? {
                if let Event::Key(key) = event::read()? {
                    tx_main_events.send(AppEvent::KeyEvent(key)).unwrap();
                }
            }
        }
    });

    let mut app = App {
        async_state: ThreadProtocol::new(tx_worker, picker.new_resize_protocol(dyn_img)),
    };

    loop {
        terminal.draw(|f| ui(f, &mut app))?;

        if let Ok(ev) = rec_main.try_recv() {
            match ev {
                AppEvent::KeyEvent(key) => {
                    if key.kind == KeyEventKind::Press {
                        if key.code == KeyCode::Char('q') {
                            break;
                        }
                    }
                }
                AppEvent::Redraw(protocol) => {
                    app.async_state.set_protocol(protocol);
                }
            }
        }
    }

    // restore terminal
    disable_raw_mode()?;
    execute!(terminal.backend_mut(), LeaveAlternateScreen,)?;
    terminal.show_cursor()?;

    Ok(())
}

Trait Implementations§

Source§

impl Clone for Picker

Source§

fn clone(&self) -> Picker

Returns a copy of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
Source§

impl Debug for Picker

Source§

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
Source§

impl Copy for Picker

Auto Trait Implementations§

§

impl Freeze for Picker

§

impl RefUnwindSafe for Picker

§

impl Send for Picker

§

impl Sync for Picker

§

impl Unpin for Picker

§

impl UnwindSafe for Picker

Blanket Implementations§

Source§

impl<T> Any for T
where T: 'static + ?Sized,

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

impl<T> CloneToUninit for T
where T: Clone,

Source§

unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

impl<T, U> Into<U> for T
where U: From<T>,

Source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Source§

impl<T> Pointable for T

Source§

const ALIGN: usize = _

The alignment of pointer.
Source§

type Init = T

The type for initializers.
Source§

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
Source§

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
Source§

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
Source§

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
Source§

impl<T> ToOwned for T
where T: Clone,

Source§

type Owned = T

The resulting type after obtaining ownership.
Source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
Source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
Source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
Source§

impl<V, T> VZip<V> for T
where V: MultiLane<T>,

Source§

fn vzip(self) -> V