AnyBot/src/marks.rs

// What a bot sees of a screen: the picture with every control it can use boxed and numbered,
// and the same numbers in a list ("[12] 連結「Profile」"). It acts by number; the click lands on
// that control's centre. Guessing coordinates from a picture is where clicks went wrong (a
// model took an empty strip for a menu item and clicked it ten times); a number can't miss.
//
// The controls come from the system's accessibility tree: macOS AX and Linux AT-SPI through
// agent-desktop on a person's computer (desktop.rs), AT-SPI in the bots' own computer
// (box/a11y). Web pages are in those trees too (Chromium with renderer accessibility on).

use std::collections::HashMap;

/// One control on the screen, in screen units (the mouse's: points on a Mac, pixels elsewhere).
#[derive(Clone, Debug, PartialEq)]
pub struct Element {
    /// 按鈕, 連結, 輸入框… (already in words).
    pub kind: String,
    pub name: String,
    pub value: String,
    pub x: f64,
    pub y: f64,
    pub w: f64,
    pub h: f64,
    /// Something to click or type into (gets a number), not just text.
    pub active: bool,
    pub flags: Vec<&'static str>,
    pub window: String,
}

impl Element {
    pub fn centre(&self) -> (f64, f64) {
        (self.x + self.w / 2.0, self.y + self.h / 2.0)
    }
}

/// Most controls numbered on one picture (more is clutter the model can't use).
pub const MAX_MARKS: usize = 150;

/// The numbered controls of the latest look at a screen: number → (centre, words).
#[derive(Clone, Debug, Default)]
pub struct Spots {
    pub by_number: HashMap<usize, ((f64, f64), String)>,
}

impl Spots {
    /// "12", "e12", "[12]" → the control's centre and what it is.
    pub fn get(&self, r: &str) -> Result<((f64, f64), String), String> {
        let n = number_of(r).ok_or_else(|| format!("「{}」不是編號：請用截圖上的編號（例如 12）", r.trim()))?;
        self.by_number.get(&n).cloned().ok_or_else(|| format!("最新的畫面裡沒有編號 {n}：先用 computer（action=screenshot）看一次畫面再點。"))
    }
}

impl Spots {
    /// The numbered control called `name` in the latest look (its name as listed: 「4」, 「Close」,
    /// 「自動更新」), so a step can say which button the way a person would. Ok(number) or why not.
    pub fn named(&self, name: &str) -> Result<usize, String> {
        let want = name.trim().trim_matches(['「', '」']);
        let name_of = |what: &str| what.split_once('「').and_then(|(_, r)| r.split_once('」')).map(|(n, _)| n.to_string());
        let mut hits: Vec<usize> = self.by_number.iter().filter(|(_, (_, what))| name_of(what).as_deref() == Some(want)).map(|(n, _)| *n).collect();
        hits.sort();
        match hits.as_slice() {
            [n] => Ok(*n),
            [] => {
                // Names that come close (one inside the other, ignoring case), so the step can be
                // put right at once instead of guessed again.
                let low = want.to_lowercase();
                let mut near: Vec<(usize, String)> = self
                    .by_number
                    .iter()
                    .filter_map(|(n, (_, what))| name_of(what).filter(|nm| !nm.is_empty()).map(|nm| (*n, nm)))
                    .filter(|(_, nm)| {
                        let l = nm.to_lowercase();
                        !low.is_empty() && (l.contains(&low) || low.contains(&l))
                    })
                    .collect();
                near.sort();
                near.truncate(6);
                if near.is_empty() {
                    Err(format!("最新的畫面裡沒有叫「{want}」的東西：照最新清單上的名字或編號點，不要猜名字。"))
                } else {
                    Err(format!("最新的畫面裡沒有叫「{want}」的東西。名字相近的有：{}。", near.iter().map(|(n, nm)| format!("[{n}]「{nm}」")).collect::<Vec<_>>().join("、")))
                }
            }
            many => Err(format!("最新的畫面裡有 {} 個叫「{want}」的東西（編號 {}）：請用編號指定是哪一個。", many.len(), many.iter().map(|n| n.to_string()).collect::<Vec<_>>().join("、"))),
        }
    }
}

/// A step that names its control (`name`, no number, no x/y) gets that control's number from
/// the latest look; so does every action of a batch.
pub fn names_to_numbers(v: &mut serde_json::Value, spots: Option<&Spots>) -> Result<(), String> {
    let fix = |p: &mut serde_json::Value| -> Result<(), String> {
        // ("name" in the screen tools; "text" too, the word the browser tools use.)
        let named = ["name", "text"].iter().find_map(|k| p[*k].as_str().map(str::trim).filter(|t| !t.is_empty()).map(String::from));
        if let Some(t) = named {
            // A name wins over coordinates sent along with it (x: 0, y: 0 from a model filling
            // every field): the click went to the screen's corner.
            if p["ref"].is_null() || p["ref"].as_str().is_some_and(|r| r.trim().is_empty()) {
                let s = spots.ok_or("先用 computer_use_screenshot 看一下畫面，再照清單上的名字或編號操作。")?;
                p["ref"] = serde_json::Value::String(s.named(&t)?.to_string());
            }
        }
        Ok(())
    };
    if let Some(actions) = v["actions"].as_array_mut() {
        for a in actions.iter_mut() {
            fix(a)?;
        }
        return Ok(());
    }
    fix(v)
}

pub fn number_of(r: &str) -> Option<usize> {
    let t = r.trim().trim_matches(['[', ']']).trim_start_matches(['e', 'E', '#']);
    t.parse().ok()
}

/// What the last look's numbers meant, so the next look keeps them: a control that is still
/// there keeps its number (the 「7」 key stays #141 after 「1」 was pressed). Renumbering every
/// look broke steps planned from one picture: a bot sending five clicks at once had the second
/// to fifth land on whatever took those numbers after the first click.
#[derive(Default, Debug, Clone)]
pub struct Numbering {
    /// (window, kind, name, position bucket) → number.
    exact: HashMap<(String, String, String, i64, i64), usize>,
    /// (window, kind, name) → numbers (moved a little, still the same control when only one).
    loose: HashMap<(String, String, String), Vec<usize>>,
    windows: Vec<String>,
    top: usize,
}

/// Position buckets for "the same control" (screen units; a list scrolled a little stays put).
const SAME_SPOT: f64 = 24.0;
/// Numbers grow while windows stay; past this they start again from 1.
const MAX_NUMBER: usize = 600;

/// Order (reading order, by window) and number the controls; the list's lines and the spots.
/// `all_text`: also list plain text (when there is no picture to read it from).
#[cfg(test)]
pub fn number(elements: &[Element], all_text: bool) -> (Vec<(usize, Element)>, Vec<String>, Spots) {
    number_keeping(elements, all_text, &mut Numbering::default())
}

/// Same, keeping the numbers of controls that were there in the last look (`memory`, updated).
/// Starts again from 1 when none of the last look's windows is still there.
pub fn number_keeping(elements: &[Element], all_text: bool, memory: &mut Numbering) -> (Vec<(usize, Element)>, Vec<String>, Spots) {
    let mut seen = std::collections::HashSet::new();
    let mut els: Vec<&Element> = elements.iter().filter(|e| e.w >= 1.0 && e.h >= 1.0 && seen.insert((e.kind.clone(), e.name.clone(), e.x as i64, e.y as i64, e.w as i64, e.h as i64))).collect();
    let mut windows: Vec<String> = vec![];
    for e in &els {
        if !windows.contains(&e.window) {
            windows.push(e.window.clone());
        }
    }
    els.sort_by(|a, b| {
        let wa = windows.iter().position(|w| *w == a.window).unwrap_or(0);
        let wb = windows.iter().position(|w| *w == b.window).unwrap_or(0);
        (wa, (a.y / 12.0) as i64, a.x as i64).cmp(&(wb, (b.y / 12.0) as i64, b.x as i64))
    });
    // Which controls get numbers (reading order, at most MAX_MARKS), then which numbers: the
    // last look's where the same control is still there, new ones above the highest.
    let marked: Vec<&Element> = els.iter().copied().filter(|e| e.active).take(MAX_MARKS).collect();
    let fresh = memory.top > MAX_NUMBER || !windows.iter().any(|w| memory.windows.contains(w));
    if fresh {
        *memory = Numbering::default();
    }
    let exact_of = |e: &Element| (e.window.clone(), e.kind.clone(), e.name.clone(), (e.centre().0 / SAME_SPOT).round() as i64, (e.centre().1 / SAME_SPOT).round() as i64);
    let loose_of = |e: &Element| (e.window.clone(), e.kind.clone(), e.name.clone());
    let mut taken: std::collections::HashSet<usize> = std::collections::HashSet::new();
    let mut assigned: Vec<Option<usize>> = marked.iter().map(|e| memory.exact.get(&exact_of(e)).copied()).collect();
    for n in assigned.iter().flatten() {
        taken.insert(*n);
    }
    // Moved a little: the one control of that kind and name in that window, both times.
    let mut loose_now: HashMap<(String, String, String), usize> = HashMap::new();
    for e in &marked {
        *loose_now.entry(loose_of(e)).or_default() += 1;
    }
    for (i, e) in marked.iter().enumerate() {
        if assigned[i].is_none() && loose_now.get(&loose_of(e)) == Some(&1) {
            if let Some([n]) = memory.loose.get(&loose_of(e)).map(Vec::as_slice) {
                if !taken.contains(n) {
                    assigned[i] = Some(*n);
                    taken.insert(*n);
                }
            }
        }
    }
    let mut top = memory.top.max(taken.iter().copied().max().unwrap_or(0));
    let mut next = Numbering { windows: windows.clone(), ..Default::default() };
    let mut number_of_el: HashMap<*const Element, usize> = HashMap::new();
    for (i, e) in marked.iter().enumerate() {
        let n = assigned[i].unwrap_or_else(|| {
            top += 1;
            top
        });
        number_of_el.insert(*e as *const Element, n);
        next.exact.insert(exact_of(e), n);
        next.loose.entry(loose_of(e)).or_default().push(n);
    }
    next.top = top;
    *memory = next;
    let mut numbered = vec![];
    let mut lines = vec![];
    let mut spots = Spots::default();
    let mut window = None;
    for e in els {
        if !e.active && !all_text {
            continue;
        }
        if windows.len() > 1 && window.as_ref() != Some(&e.window) && !e.window.is_empty() {
            window = Some(e.window.clone());
            lines.push(format!("## {}", e.window));
        }
        let what = describe(e);
        if let Some(&n) = number_of_el.get(&(e as *const Element)) {
            spots.by_number.insert(n, (e.centre(), what.clone()));
            numbered.push((n, e.clone()));
            lines.push(format!("[{n}] {what}"));
        } else if !e.active {
            lines.push(format!("    {what}"));
        }
    }
    (numbered, lines, spots)
}

fn describe(e: &Element) -> String {
    let short = |s: &str, n: usize| -> String {
        let c: Vec<char> = s.chars().collect();
        if c.len() > n { format!("{}…", c[..n].iter().collect::<String>()) } else { s.to_string() }
    };
    let mut t = e.kind.clone();
    if !e.name.is_empty() {
        t.push_str(&format!("「{}」", short(&e.name, 60)));
    }
    if !e.value.is_empty() && e.value != e.name {
        t.push_str(&format!("：{}", short(&e.value, 80)));
    }
    if !e.flags.is_empty() {
        t.push_str(&format!("（{}）", e.flags.join("、")));
    }
    t
}

/// A fingerprint of what the controls are and where (to say "nothing changed").
/// What came and what went between two looks at the screen (multiset of (kind, name)).
/// The quick model reads this to know what its last step did, without re-reading the whole
/// numbered list (the list is long; the change is usually two lines).
pub fn diff(prev: &[Element], now: &[Element]) -> Vec<String> {
    fn key(e: &Element) -> (&str, &str) {
        (e.kind.as_str(), e.name.as_str())
    }
    let mut counts: HashMap<(&str, &str), i32> = HashMap::new();
    for e in prev {
        *counts.entry(key(e)).or_default() += 1;
    }
    for e in now {
        *counts.entry(key(e)).or_default() -= 1;
    }
    let mut lines = Vec::new();
    // Order: as they appear in the current picture (adds), then as they were listed (removes).
    let mut shown: std::collections::HashSet<(&str, &str)> = std::collections::HashSet::new();
    for e in now {
        let k = key(e);
        if counts.get(&k) == Some(&-1) && shown.insert(k) {
            lines.push(format!("＋ {}「{}」", e.kind, e.name));
        }
    }
    for e in prev {
        let k = key(e);
        if counts.get(&k) == Some(&1) && shown.insert(k) {
            lines.push(format!("－ {}「{}」", e.kind, e.name));
        }
    }
    // A dialog that appeared entirely is the case that matters: show it in full.
    lines.truncate(12);
    lines
}

pub fn fingerprint(elements: &[Element]) -> u64 {
    use std::hash::{Hash, Hasher};
    let mut h = std::collections::hash_map::DefaultHasher::new();
    for e in elements {
        (e.kind.as_str(), e.name.as_str(), e.value.as_str(), e.x as i64, e.y as i64, e.w as i64, e.h as i64, e.flags.len()).hash(&mut h);
    }
    h.finish()
}

/// A coarse fingerprint of a picture (16×10 grey cells), for "nothing changed" when there is no
/// tree to compare.
pub fn picture_fingerprint(img: &image::RgbImage) -> u64 {
    use std::hash::{Hash, Hasher};
    let small = image::imageops::resize(img, 16, 10, image::imageops::FilterType::Triangle);
    let mut h = std::collections::hash_map::DefaultHasher::new();
    for p in small.pixels() {
        // Quantised, so a blinking caret or a clock's second doesn't count as a change.
        ((p[0] as u16 + p[1] as u16 + p[2] as u16) / 24).hash(&mut h);
    }
    h.finish()
}

const COLOURS: [[u8; 3]; 6] = [[220, 38, 38], [37, 99, 235], [22, 163, 74], [192, 38, 211], [234, 88, 12], [8, 145, 178]];

/// Box and number each control on the picture. `to_pic` maps screen units to picture pixels.
pub fn draw(img: &mut image::RgbImage, numbered: &[(usize, Element)], to_pic: (f64, f64)) {
    let (iw, ih) = (img.width() as i64, img.height() as i64);
    for (n, e) in numbered {
        let c = COLOURS[n % COLOURS.len()];
        let (x0, y0) = ((e.x / to_pic.0).round() as i64, (e.y / to_pic.1).round() as i64);
        let (x1, y1) = (((e.x + e.w) / to_pic.0).round() as i64, ((e.y + e.h) / to_pic.1).round() as i64);
        rect_outline(img, x0, y0, x1, y1, c);
        // The number: white digits on the control's colour, at its top-left corner (inside the
        // picture).
        let label = n.to_string();
        let (lw, lh) = (label.len() as i64 * (DIGIT_W + 1) * SCALE + 3, DIGIT_H * SCALE + 4);
        let lx = x0.clamp(0, (iw - lw).max(0));
        let ly = (y0 - lh).clamp(0, (ih - lh).max(0));
        let ly = if ly + lh > y0 && y0 >= lh { y0 - lh } else { ly };
        fill(img, lx, ly, lx + lw, ly + lh, c);
        let mut cx = lx + 2;
        for ch in label.bytes() {
            digit(img, cx, ly + 2, ch - b'0', [255, 255, 255]);
            cx += (DIGIT_W + 1) * SCALE;
        }
    }
}

fn put(img: &mut image::RgbImage, x: i64, y: i64, c: [u8; 3]) {
    if x >= 0 && y >= 0 && (x as u32) < img.width() && (y as u32) < img.height() {
        img.put_pixel(x as u32, y as u32, image::Rgb(c));
    }
}

fn fill(img: &mut image::RgbImage, x0: i64, y0: i64, x1: i64, y1: i64, c: [u8; 3]) {
    for y in y0..y1 {
        for x in x0..x1 {
            put(img, x, y, c);
        }
    }
}

fn rect_outline(img: &mut image::RgbImage, x0: i64, y0: i64, x1: i64, y1: i64, c: [u8; 3]) {
    for x in x0..=x1 {
        put(img, x, y0, c);
        put(img, x, y1, c);
    }
    for y in y0..=y1 {
        put(img, x0, y, c);
        put(img, x1, y, c);
    }
}

/// A 3×5 digit font, each pixel drawn SCALE×SCALE.
const DIGIT_W: i64 = 3;
const DIGIT_H: i64 = 5;
const SCALE: i64 = 2;
const DIGITS: [[u8; 5]; 10] = [
    [0b111, 0b101, 0b101, 0b101, 0b111],
    [0b010, 0b110, 0b010, 0b010, 0b111],
    [0b111, 0b001, 0b111, 0b100, 0b111],
    [0b111, 0b001, 0b111, 0b001, 0b111],
    [0b101, 0b101, 0b111, 0b001, 0b001],
    [0b111, 0b100, 0b111, 0b001, 0b111],
    [0b111, 0b100, 0b111, 0b101, 0b111],
    [0b111, 0b001, 0b010, 0b010, 0b010],
    [0b111, 0b101, 0b111, 0b101, 0b111],
    [0b111, 0b101, 0b111, 0b001, 0b111],
];

fn digit(img: &mut image::RgbImage, x: i64, y: i64, d: u8, c: [u8; 3]) {
    let rows = DIGITS[(d as usize).min(9)];
    for (r, bits) in rows.iter().enumerate() {
        for col in 0..DIGIT_W {
            if bits >> (DIGIT_W - 1 - col) & 1 == 1 {
                fill(img, x + col * SCALE, y + r as i64 * SCALE, x + (col + 1) * SCALE, y + (r as i64 + 1) * SCALE, c);
            }
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn mel(kind: &str, name: &str) -> Element {
        Element { kind: kind.into(), name: name.into(), value: String::new(), x: 0.0, y: 0.0, w: 10.0, h: 10.0, active: true, flags: vec![], window: String::new() }
    }

    #[test]
    fn the_change_between_two_looks_is_two_lines() {
        let before = vec![mel("按鈕", "Save"), mel("輸入框", "標題")];
        let after = vec![mel("按鈕", "Save"), mel("按鈕", "OK"), mel("按鈕", "Cancel")];
        assert_eq!(diff(&before, &after), ["＋ 按鈕「OK」", "＋ 按鈕「Cancel」", "－ 輸入框「標題」"]);
        // Same controls twice = a multiset: one of two identical buttons leaving is a change.
        let two = vec![mel("按鈕", "x"), mel("按鈕", "x")];
        assert_eq!(diff(&two, &[mel("按鈕", "x")]), ["－ 按鈕「x」"]);
        assert!(diff(&before, &before).is_empty());
    }


    fn el(kind: &str, name: &str, x: f64, y: f64, active: bool) -> Element {
        Element { kind: kind.into(), name: name.into(), value: String::new(), x, y, w: 40.0, h: 20.0, active, flags: vec![], window: "W".into() }
    }

    /// A control still there keeps its number from look to look, even when other controls come
    /// and go before it in reading order; a new one gets a number above the highest; a look at a
    /// different window starts from 1.
    #[test]
    fn a_control_can_be_named_instead_of_numbered() {
        let els = vec![el("按鈕", "4", 10.0, 10.0, true), el("按鈕", "AC", 60.0, 10.0, true), el("按鈕", "C", 110.0, 10.0, true), el("勾選框", "自動更新", 10.0, 60.0, true)];
        let (_, _, spots) = number(&els, false);
        assert_eq!(spots.named("4").unwrap(), 1);
        assert_eq!(spots.named("「C」").unwrap(), 3, "C is not AC");
        assert!(spots.named("Save").unwrap_err().contains("沒有叫「Save」"));
        // A near miss names what is there.
        let near = spots.named("自動").unwrap_err();
        assert!(near.contains("名字相近") && near.contains("[4]「自動更新」"), "{near}");
        let mut v = serde_json::json!({"actions": [{"action": "click", "name": "4"}, {"action": "click", "ref": "2"}, {"action": "typing", "value": "x"}]});
        names_to_numbers(&mut v, Some(&spots)).unwrap();
        assert_eq!(v["actions"][0]["ref"], "1");
        assert_eq!(v["actions"][1]["ref"], "2");
        assert!(v["actions"][2]["ref"].is_null());
        let mut one = serde_json::json!({"name": "自動更新"});
        names_to_numbers(&mut one, Some(&spots)).unwrap();
        assert_eq!(one["ref"], "4");
        // A name with x: 0, y: 0 beside it: the name.
        let mut both = serde_json::json!({"name": "AC", "x": 0.0, "y": 0.0});
        names_to_numbers(&mut both, Some(&spots)).unwrap();
        assert_eq!(both["ref"], "2");
    }

    #[test]
    fn numbers_stay_with_their_controls() {
        let mut m = Numbering::default();
        let keys = |extra: bool| {
            let mut v = vec![];
            if extra {
                v.push(el("選單", "說明", 5.0, 5.0, true));
            }
            for (i, k) in ["7", "8", "9", "*"].iter().enumerate() {
                v.push(el("按鈕", k, 100.0 + 50.0 * i as f64, 200.0, true));
            }
            v
        };
        let (first, _, _) = number_keeping(&keys(false), false, &mut m);
        let n_of = |list: &[(usize, Element)], name: &str| list.iter().find(|(_, e)| e.name == name).map(|(n, _)| *n).unwrap();
        assert_eq!(n_of(&first, "9"), 3);
        // A menu appears first in reading order: the keys keep their numbers, the menu is new.
        let (second, lines, spots) = number_keeping(&keys(true), false, &mut m);
        assert_eq!(n_of(&second, "9"), 3);
        assert_eq!(n_of(&second, "說明"), 5);
        assert_eq!(spots.get("3").unwrap().1, "按鈕「9」");
        assert_eq!(lines[0], "[5] 選單「說明」");
        // Moved a little (a list scrolled): still the same control.
        let mut moved = keys(true);
        for e in moved.iter_mut() {
            e.y += 30.0;
        }
        let (third, _, _) = number_keeping(&moved, false, &mut m);
        assert_eq!(n_of(&third, "9"), 3);
        // Another window altogether: from 1 again.
        let other: Vec<Element> = keys(false).into_iter().map(|e| Element { window: "Other".into(), ..e }).collect();
        let (fourth, _, _) = number_keeping(&other, false, &mut m);
        assert_eq!(n_of(&fourth, "7"), 1);
    }

    #[test]
    fn controls_are_numbered_in_reading_order() {
        let els = vec![el("按鈕", "下", 10.0, 300.0, true), el("連結", "Profile", 20.0, 100.0, true), el("文字", "標題", 0.0, 50.0, false), el("連結", "Profile", 20.0, 100.0, true)];
        let (numbered, lines, spots) = number(&els, false);
        // Reading order, duplicates once, plain text left out when there is a picture.
        assert_eq!(lines, vec!["[1] 連結「Profile」", "[2] 按鈕「下」"]);
        assert_eq!(numbered.len(), 2);
        assert_eq!(spots.get("1").unwrap(), ((40.0, 110.0), "連結「Profile」".to_string()));
        assert_eq!(spots.get("e2").unwrap().0, (30.0, 310.0));
        assert!(spots.get("3").is_err() && spots.get("ok").is_err());
        // Without a picture the text is listed too (not numbered).
        let (_, lines, _) = number(&els, true);
        assert_eq!(lines, vec!["    文字「標題」", "[1] 連結「Profile」", "[2] 按鈕「下」"]);
    }

    #[test]
    fn numbers_are_drawn_on_the_picture() {
        let mut img = image::RgbImage::from_pixel(200, 100, image::Rgb([255, 255, 255]));
        let els = vec![el("按鈕", "OK", 100.0, 60.0, true)];
        let (numbered, _, _) = number(&els, false);
        // Screen twice the picture's size: the box lands at (50, 30)–(70, 40).
        draw(&mut img, &numbered, (2.0, 2.0));
        assert_eq!(img.get_pixel(50, 35).0, COLOURS[1]);
        assert_eq!(img.get_pixel(60, 30).0, COLOURS[1]);
        // The label sits above the box with white digits in it.
        let label_has_white = (16..30).any(|y| (50..62).any(|x| img.get_pixel(x, y).0 == [255, 255, 255]));
        let label_has_colour = (16..30).any(|y| (50..62).any(|x| img.get_pixel(x, y).0 == COLOURS[1]));
        assert!(label_has_white && label_has_colour);
    }

    #[test]
    fn a_still_screen_has_the_same_fingerprint() {
        let a = vec![el("按鈕", "OK", 1.0, 2.0, true)];
        let mut b = a.clone();
        assert_eq!(fingerprint(&a), fingerprint(&b));
        b[0].name = "Cancel".into();
        assert_ne!(fingerprint(&a), fingerprint(&b));
        let img = image::RgbImage::from_pixel(64, 40, image::Rgb([10, 20, 30]));
        let mut img2 = img.clone();
        img2.put_pixel(0, 0, image::Rgb([12, 20, 30]));
        assert_eq!(picture_fingerprint(&img), picture_fingerprint(&img2));
    }
}