rust: tui (canvas renderer, views, modals, crossterm event loop)
Port of internal/tui. Bubble Tea's message loop is replaced by a crossterm input thread, timers and background commands feeding one loop; the frame cache, canvas, colour quantisation, LOD treemap, selection persistence and modal architecture are kept. Frames are diffed against the previous one per line and per style run. Exposes tui::bench::BenchModel and big_tree for benchmarks.
This commit is contained in:
Andy Dixon
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//! An in-memory cell grid that every view paints into; serialised once per
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//! frame with minimal SGR changes.
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use super::color256::{quant16, quant256};
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use crate::textutil;
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use crate::treemap::Rect;
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use std::fmt::Write;
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/// 0 for the terminal default, otherwise 0x01RRGGBB.
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#[derive(Clone, Copy, PartialEq, Eq, Hash, Default, Debug)]
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pub(crate) struct Color(pub u32);
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/// Builds a colour.
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pub(crate) const fn rgb(r: u8, g: u8, b: u8) -> Color {
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Color(1 << 24 | (r as u32) << 16 | (g as u32) << 8 | b as u32)
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}
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impl Color {
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/// Parses "#rrggbb".
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pub fn hex(s: &str) -> Option<Color> {
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let s = s.strip_prefix('#').unwrap_or(s);
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if s.len() != 6 || !s.bytes().all(|b| b.is_ascii_hexdigit()) {
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return None;
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}
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u32::from_str_radix(s, 16).ok().map(|v| Color(1 << 24 | v))
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}
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pub fn is_default(self) -> bool {
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self.0 == 0
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}
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pub fn r(self) -> u8 {
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(self.0 >> 16) as u8
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}
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pub fn g(self) -> u8 {
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(self.0 >> 8) as u8
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}
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pub fn b(self) -> u8 {
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self.0 as u8
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}
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pub fn comps(self) -> (f64, f64, f64) {
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(self.r() as f64 / 255.0, self.g() as f64 / 255.0, self.b() as f64 / 255.0)
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}
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/// Blends c towards o by t (0..1). Default colours are returned as-is.
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pub fn mix(self, o: Color, t: f64) -> Color {
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if self.0 == 0 || o.0 == 0 {
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return self;
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}
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let (r1, g1, b1) = self.comps();
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let (r2, g2, b2) = o.comps();
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let f = |a: f64, b: f64| ((a + (b - a) * t) * 255.0) as u8;
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rgb(f(r1, r2), f(g1, g2), f(b1, b2))
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}
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/// Perceived brightness 0..1.
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pub fn luma(self) -> f64 {
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let (r, g, b) = self.comps();
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0.299 * r + 0.587 * g + 0.114 * b
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}
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}
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/// Text attribute bit set.
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pub(crate) type Attr = u8;
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pub(crate) const BOLD: Attr = 1;
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pub(crate) const FAINT: Attr = 2;
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pub(crate) const ITALIC: Attr = 4;
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pub(crate) const UNDERLINE: Attr = 8;
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pub(crate) const REVERSE: Attr = 16;
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/// A cell style.
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#[derive(Clone, Copy, PartialEq, Eq, Default, Debug)]
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pub(crate) struct Style {
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pub fg: Color,
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pub bg: Color,
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pub attr: Attr,
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}
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impl Style {
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pub const fn new(fg: Color, bg: Color) -> Style {
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Style { fg, bg, attr: 0 }
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}
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pub const fn with(self, a: Attr) -> Style {
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Style { attr: self.attr | a, ..self }
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}
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}
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const INLINE: usize = 15;
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const HEAP: u8 = 255;
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/// One grid cell. The cluster is stored inline (n bytes) or, if longer,
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/// in the canvas side table (n == HEAP, index in the first four bytes).
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/// n == 0 marks the continuation of a wide cluster.
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#[derive(Clone, Copy)]
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struct Cell {
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g: [u8; INLINE],
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n: u8,
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w: u8,
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st: Style,
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}
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impl Cell {
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fn space(st: Style) -> Cell {
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let mut g = [0; INLINE];
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g[0] = b' ';
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Cell { g, n: 1, w: 1, st }
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}
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fn is_cont(&self) -> bool {
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self.n == 0
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}
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fn set_space(&mut self) {
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self.g[0] = b' ';
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self.n = 1;
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self.w = 1;
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}
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}
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/// Box glyph sets.
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#[derive(Clone, Copy)]
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pub(crate) struct BoxChars {
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pub h: &'static str,
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pub v: &'static str,
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pub tl: &'static str,
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pub tr: &'static str,
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pub bl: &'static str,
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pub br: &'static str,
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}
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pub(crate) const BOX_LIGHT: BoxChars = BoxChars { h: "─", v: "│", tl: "┌", tr: "┐", bl: "└", br: "┘" };
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pub(crate) const BOX_ROUND: BoxChars = BoxChars { h: "─", v: "│", tl: "╭", tr: "╮", bl: "╰", br: "╯" };
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pub(crate) const BOX_DOUBLE: BoxChars = BoxChars { h: "═", v: "║", tl: "╔", tr: "╗", bl: "╚", br: "╝" };
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pub(crate) const BOX_ASCII: BoxChars = BoxChars { h: "-", v: "|", tl: "+", tr: "+", bl: "+", br: "+" };
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pub(crate) const BOX_ASCII_SEL: BoxChars = BoxChars { h: "=", v: "#", tl: "#", tr: "#", bl: "#", br: "#" };
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/// Selects how colours are serialised.
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#[derive(Clone, Copy, PartialEq, Eq, Debug)]
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pub(crate) enum Depth {
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True,
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C256,
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C16,
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None, // attributes only
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}
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/// An in-memory cell grid.
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pub(crate) struct Canvas {
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pub w: i32,
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pub h: i32,
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c: Vec<Cell>,
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big: Vec<String>,
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}
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impl Canvas {
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/// Creates a canvas filled with spaces in style st.
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pub fn new(w: i32, h: i32, st: Style) -> Canvas {
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let (w, h) = (w.max(0), h.max(0));
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Canvas { w, h, c: vec![Cell::space(st); (w * h) as usize], big: Vec::new() }
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}
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fn inside(&self, x: i32, y: i32) -> bool {
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x >= 0 && y >= 0 && x < self.w && y < self.h
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}
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fn cell_str<'a>(&'a self, c: &'a Cell) -> &'a str {
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if c.n == HEAP {
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let i = u32::from_le_bytes([c.g[0], c.g[1], c.g[2], c.g[3]]) as usize;
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return &self.big[i];
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}
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// Only whole UTF-8 clusters are ever stored.
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std::str::from_utf8(&c.g[..c.n as usize]).unwrap_or("?")
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}
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fn make(&mut self, s: &str, w: i32, st: Style) -> Cell {
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let mut g = [0; INLINE];
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let n = if s.len() <= INLINE {
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g[..s.len()].copy_from_slice(s.as_bytes());
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s.len() as u8
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} else {
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g[..4].copy_from_slice(&(self.big.len() as u32).to_le_bytes());
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self.big.push(s.to_string());
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HEAP
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};
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Cell { g, n, w: w as u8, st }
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}
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/// Writes one cluster of width w at (x, y), repairing any wide cluster
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/// it overlaps so the grid never holds half a character.
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fn put(&mut self, x: i32, y: i32, s: &str, w: i32, st: Style) {
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if !self.inside(x, y) || x + w > self.w {
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return;
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}
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let row = (y * self.w) as usize;
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let (xu, wu, cw) = (x as usize, w as usize, self.w as usize);
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for i in xu..xu + wu {
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if self.c[row + i].is_cont() && i > 0 && i == xu {
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// overwriting the tail of a wide cluster
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self.c[row + i - 1].set_space();
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}
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let c = self.c[row + i];
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if !c.is_cont() && c.w > 1 && i + 1 < cw && self.c[row + i + 1].is_cont() {
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// overwriting its head
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self.c[row + i + 1].set_space();
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}
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}
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self.c[row + xu] = self.make(s, w, st);
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for i in 1..wu {
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self.c[row + xu + i] = Cell { g: [0; INLINE], n: 0, w: 0, st };
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}
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}
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/// Draws s at (x, y), clipped to max_w cells and the canvas. Control
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/// characters are replaced as a second line of defence (callers sanitise
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/// untrusted strings first). It returns the number of cells used.
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pub fn text(&mut self, x: i32, y: i32, s: &str, max_w: i32, st: Style) -> i32 {
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if y < 0 || y >= self.h {
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return 0;
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}
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let limit = (x + max_w).min(self.w);
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let mut cx = x;
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textutil::clusters(s, |c, w| {
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let (mut c, mut w) = (c, w as i32);
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let b = c.as_bytes();
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if b[0] < 0x20 || b[0] == 0x7f || (b.len() > 1 && b[0] == 0xc2 && b[1] < 0xa0) {
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(c, w) = ("?", 1);
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}
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if cx + w > limit {
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// A wide cluster that does not fit leaves a blank cell.
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while cx < limit {
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if cx >= 0 {
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self.put(cx, y, " ", 1, st);
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}
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cx += 1;
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}
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return false;
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}
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if cx >= 0 {
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self.put(cx, y, c, w, st);
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}
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cx += w;
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true
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});
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cx - x
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}
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/// Draws s centred within [x, x+w).
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pub fn text_centered(&mut self, x: i32, y: i32, w: i32, s: &str, st: Style) {
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let s = textutil::truncate(s, w.max(0) as usize);
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self.text(x + (w - textutil::width(&s) as i32) / 2, y, &s, w, st);
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}
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/// Draws s right-aligned ending at x+w.
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pub fn text_right(&mut self, x: i32, y: i32, w: i32, s: &str, st: Style) {
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let s = textutil::truncate(s, w.max(0) as usize);
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self.text(x + w - textutil::width(&s) as i32, y, &s, w, st);
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}
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/// Fills r with the single-cell cluster ch.
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pub fn fill(&mut self, r: Rect, ch: &str, st: Style) {
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for y in r.y.max(0)..(r.y + r.h).min(self.h) {
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for x in r.x.max(0)..(r.x + r.w).min(self.w) {
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self.put(x, y, ch, 1, st);
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}
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}
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}
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/// Applies f to the style of every cell in r.
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pub fn restyle(&mut self, r: Rect, f: impl Fn(Style) -> Style) {
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for y in r.y.max(0)..(r.y + r.h).min(self.h) {
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for x in r.x.max(0)..(r.x + r.w).min(self.w) {
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let c = &mut self.c[(y * self.w + x) as usize];
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c.st = f(c.st);
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}
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}
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}
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/// Draws a border around r (which must be at least 2×2).
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pub fn draw_box(&mut self, r: Rect, b: BoxChars, st: Style) {
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if r.w < 2 || r.h < 2 {
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return;
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}
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let (x1, y1) = (r.x + r.w - 1, r.y + r.h - 1);
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for x in r.x + 1..x1 {
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self.put(x, r.y, b.h, 1, st);
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self.put(x, y1, b.h, 1, st);
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}
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for y in r.y + 1..y1 {
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self.put(r.x, y, b.v, 1, st);
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self.put(x1, y, b.v, 1, st);
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}
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self.put(r.x, r.y, b.tl, 1, st);
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self.put(x1, r.y, b.tr, 1, st);
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self.put(r.x, y1, b.bl, 1, st);
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self.put(x1, y1, b.br, 1, st);
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}
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/// Draws a horizontal rule.
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pub fn hline(&mut self, x: i32, y: i32, w: i32, ch: &str, st: Style) {
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for i in x..x + w {
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self.put(i, y, ch, 1, st);
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}
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}
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/// Serialises the canvas as lines of text with SGR styling. For 256 and
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/// 16 colours it quantizes with its own perceptual mapping (see
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/// color256.rs); Depth::None keeps attributes only.
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pub fn render(&self, depth: Depth) -> String {
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let mut b = String::with_capacity((self.w * self.h * 4) as usize);
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for y in 0..self.h {
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if y > 0 {
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b.push('\n');
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}
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let mut cur = Style::default();
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let mut first = true;
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for x in 0..self.w {
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let c = &self.c[(y * self.w + x) as usize];
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if c.is_cont() {
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continue;
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}
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if first || c.st != cur {
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sgr(&mut b, c.st, depth);
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cur = c.st;
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first = false;
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}
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b.push_str(self.cell_str(c));
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}
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b.push_str("\x1b[0m");
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}
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b
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}
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}
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fn sgr(b: &mut String, st: Style, depth: Depth) {
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b.push_str("\x1b[0");
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for (bit, code) in [(BOLD, ";1"), (FAINT, ";2"), (ITALIC, ";3"), (UNDERLINE, ";4"), (REVERSE, ";7")] {
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if st.attr & bit != 0 {
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b.push_str(code);
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}
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}
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let col = |b: &mut String, c: Color, bg: bool| {
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if c.is_default() {
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return;
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}
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let _ = match depth {
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Depth::None => Ok(()),
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Depth::C256 => write!(b, ";{};5;{}", if bg { 48 } else { 38 }, quant256(c)),
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Depth::C16 => {
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let n = quant16(c) as u32;
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let mut code = if n >= 8 { 90 + n - 8 } else { 30 + n };
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if bg {
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code += 10;
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}
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write!(b, ";{code}")
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}
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Depth::True => write!(b, ";{};2;{};{};{}", if bg { 48 } else { 38 }, c.r(), c.g(), c.b()),
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};
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};
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col(b, st.fg, false);
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col(b, st.bg, true);
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b.push('m');
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}
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Reference in New Issue
Block a user