mirror of
https://github.com/zed-industries/zed.git
synced 2025-01-12 05:15:00 +00:00
8ba2f77148
Co-authored-by: Mikayla <mikayla@zed.dev>
777 lines
24 KiB
Rust
777 lines
24 KiB
Rust
use crate::{
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color::Color,
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fonts::{FontId, GlyphId, Underline},
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geometry::{
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rect::RectF,
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vector::{vec2f, Vector2F},
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},
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platform, scene, FontSystem, PaintContext,
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};
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use ordered_float::OrderedFloat;
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use parking_lot::{Mutex, RwLock, RwLockUpgradableReadGuard};
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use smallvec::SmallVec;
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use std::{
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borrow::Borrow,
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collections::HashMap,
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hash::{Hash, Hasher},
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iter,
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sync::Arc,
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};
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pub struct TextLayoutCache {
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prev_frame: Mutex<HashMap<CacheKeyValue, Arc<LineLayout>>>,
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curr_frame: RwLock<HashMap<CacheKeyValue, Arc<LineLayout>>>,
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fonts: Arc<dyn platform::FontSystem>,
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}
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub struct RunStyle {
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pub color: Color,
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pub font_id: FontId,
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pub underline: Underline,
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}
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impl TextLayoutCache {
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pub fn new(fonts: Arc<dyn platform::FontSystem>) -> Self {
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Self {
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prev_frame: Mutex::new(HashMap::new()),
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curr_frame: RwLock::new(HashMap::new()),
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fonts,
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}
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}
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pub fn finish_frame(&self) {
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let mut prev_frame = self.prev_frame.lock();
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let mut curr_frame = self.curr_frame.write();
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std::mem::swap(&mut *prev_frame, &mut *curr_frame);
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curr_frame.clear();
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}
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pub fn layout_str<'a>(
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&'a self,
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text: &'a str,
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font_size: f32,
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runs: &'a [(usize, RunStyle)],
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) -> Line {
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let key = &CacheKeyRef {
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text,
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font_size: OrderedFloat(font_size),
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runs,
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} as &dyn CacheKey;
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let curr_frame = self.curr_frame.upgradable_read();
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if let Some(layout) = curr_frame.get(key) {
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return Line::new(layout.clone(), runs);
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}
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let mut curr_frame = RwLockUpgradableReadGuard::upgrade(curr_frame);
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if let Some((key, layout)) = self.prev_frame.lock().remove_entry(key) {
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curr_frame.insert(key, layout.clone());
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Line::new(layout, runs)
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} else {
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let layout = Arc::new(self.fonts.layout_line(text, font_size, runs));
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let key = CacheKeyValue {
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text: text.into(),
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font_size: OrderedFloat(font_size),
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runs: SmallVec::from(runs),
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};
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curr_frame.insert(key, layout.clone());
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Line::new(layout, runs)
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}
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}
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}
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trait CacheKey {
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fn key(&self) -> CacheKeyRef;
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}
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impl<'a> PartialEq for (dyn CacheKey + 'a) {
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fn eq(&self, other: &dyn CacheKey) -> bool {
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self.key() == other.key()
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}
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}
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impl<'a> Eq for (dyn CacheKey + 'a) {}
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impl<'a> Hash for (dyn CacheKey + 'a) {
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fn hash<H: Hasher>(&self, state: &mut H) {
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self.key().hash(state)
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}
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}
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#[derive(Eq)]
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struct CacheKeyValue {
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text: String,
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font_size: OrderedFloat<f32>,
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runs: SmallVec<[(usize, RunStyle); 1]>,
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}
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impl CacheKey for CacheKeyValue {
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fn key(&self) -> CacheKeyRef {
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CacheKeyRef {
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text: self.text.as_str(),
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font_size: self.font_size,
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runs: self.runs.as_slice(),
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}
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}
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}
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impl PartialEq for CacheKeyValue {
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fn eq(&self, other: &Self) -> bool {
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self.key().eq(&other.key())
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}
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}
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impl Hash for CacheKeyValue {
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fn hash<H: Hasher>(&self, state: &mut H) {
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self.key().hash(state);
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}
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}
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impl<'a> Borrow<dyn CacheKey + 'a> for CacheKeyValue {
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fn borrow(&self) -> &(dyn CacheKey + 'a) {
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self as &dyn CacheKey
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}
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}
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#[derive(Copy, Clone)]
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struct CacheKeyRef<'a> {
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text: &'a str,
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font_size: OrderedFloat<f32>,
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runs: &'a [(usize, RunStyle)],
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}
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impl<'a> CacheKey for CacheKeyRef<'a> {
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fn key(&self) -> CacheKeyRef {
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*self
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}
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}
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impl<'a> PartialEq for CacheKeyRef<'a> {
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fn eq(&self, other: &Self) -> bool {
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self.text == other.text
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&& self.font_size == other.font_size
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&& self.runs.len() == other.runs.len()
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&& self.runs.iter().zip(other.runs.iter()).all(
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|((len_a, style_a), (len_b, style_b))| {
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len_a == len_b && style_a.font_id == style_b.font_id
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},
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)
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}
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}
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impl<'a> Hash for CacheKeyRef<'a> {
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fn hash<H: Hasher>(&self, state: &mut H) {
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self.text.hash(state);
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self.font_size.hash(state);
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for (len, style_id) in self.runs {
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len.hash(state);
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style_id.font_id.hash(state);
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}
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}
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}
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#[derive(Default, Debug, Clone)]
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pub struct Line {
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layout: Arc<LineLayout>,
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style_runs: SmallVec<[(u32, Color, Underline); 32]>,
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}
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#[derive(Default, Debug)]
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pub struct LineLayout {
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pub width: f32,
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pub ascent: f32,
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pub descent: f32,
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pub runs: Vec<Run>,
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pub len: usize,
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pub font_size: f32,
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}
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#[derive(Debug)]
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pub struct Run {
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pub font_id: FontId,
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pub glyphs: Vec<Glyph>,
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}
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#[derive(Clone, Debug)]
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pub struct Glyph {
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pub id: GlyphId,
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pub position: Vector2F,
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pub index: usize,
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pub is_emoji: bool,
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}
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impl Line {
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fn new(layout: Arc<LineLayout>, runs: &[(usize, RunStyle)]) -> Self {
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let mut style_runs = SmallVec::new();
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for (len, style) in runs {
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style_runs.push((*len as u32, style.color, style.underline));
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}
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Self { layout, style_runs }
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}
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pub fn runs(&self) -> &[Run] {
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&self.layout.runs
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}
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pub fn width(&self) -> f32 {
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self.layout.width
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}
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pub fn font_size(&self) -> f32 {
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self.layout.font_size
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}
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pub fn x_for_index(&self, index: usize) -> f32 {
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for run in &self.layout.runs {
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for glyph in &run.glyphs {
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if glyph.index >= index {
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return glyph.position.x();
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}
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}
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}
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self.layout.width
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}
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pub fn font_for_index(&self, index: usize) -> Option<FontId> {
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for run in &self.layout.runs {
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for glyph in &run.glyphs {
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if glyph.index >= index {
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return Some(run.font_id);
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}
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}
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}
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None
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}
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pub fn len(&self) -> usize {
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self.layout.len
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}
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pub fn is_empty(&self) -> bool {
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self.layout.len == 0
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}
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pub fn index_for_x(&self, x: f32) -> Option<usize> {
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if x >= self.layout.width {
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None
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} else {
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for run in self.layout.runs.iter().rev() {
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for glyph in run.glyphs.iter().rev() {
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if glyph.position.x() <= x {
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return Some(glyph.index);
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}
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}
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}
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Some(0)
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}
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}
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pub fn paint(
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&self,
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origin: Vector2F,
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visible_bounds: RectF,
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line_height: f32,
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cx: &mut PaintContext,
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) {
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let padding_top = (line_height - self.layout.ascent - self.layout.descent) / 2.;
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let baseline_offset = vec2f(0., padding_top + self.layout.ascent);
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let mut style_runs = self.style_runs.iter();
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let mut run_end = 0;
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let mut color = Color::black();
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let mut underline = None;
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for run in &self.layout.runs {
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let max_glyph_width = cx
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.font_cache
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.bounding_box(run.font_id, self.layout.font_size)
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.x();
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for glyph in &run.glyphs {
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let glyph_origin = origin + baseline_offset + glyph.position;
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if glyph_origin.x() > visible_bounds.upper_right().x() {
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break;
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}
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let mut finished_underline = None;
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if glyph.index >= run_end {
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if let Some((run_len, run_color, run_underline)) = style_runs.next() {
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if let Some((_, underline_style)) = underline {
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if *run_underline != underline_style {
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finished_underline = underline.take();
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}
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}
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if run_underline.thickness.into_inner() > 0. {
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underline.get_or_insert((
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vec2f(
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glyph_origin.x(),
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origin.y() + baseline_offset.y() + 0.618 * self.layout.descent,
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),
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Underline {
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color: Some(run_underline.color.unwrap_or(*run_color)),
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thickness: run_underline.thickness,
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squiggly: run_underline.squiggly,
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},
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));
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}
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run_end += *run_len as usize;
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color = *run_color;
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} else {
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run_end = self.layout.len;
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finished_underline = underline.take();
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}
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}
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if glyph_origin.x() + max_glyph_width < visible_bounds.origin().x() {
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continue;
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}
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if let Some((underline_origin, underline_style)) = finished_underline {
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cx.scene.push_underline(scene::Underline {
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origin: underline_origin,
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width: glyph_origin.x() - underline_origin.x(),
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thickness: underline_style.thickness.into(),
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color: underline_style.color.unwrap(),
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squiggly: underline_style.squiggly,
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});
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}
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if glyph.is_emoji {
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cx.scene.push_image_glyph(scene::ImageGlyph {
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font_id: run.font_id,
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font_size: self.layout.font_size,
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id: glyph.id,
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origin: glyph_origin,
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});
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} else {
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cx.scene.push_glyph(scene::Glyph {
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font_id: run.font_id,
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font_size: self.layout.font_size,
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id: glyph.id,
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origin: glyph_origin,
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color,
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});
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}
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}
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}
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if let Some((underline_start, underline_style)) = underline.take() {
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let line_end_x = origin.x() + self.layout.width;
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cx.scene.push_underline(scene::Underline {
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origin: underline_start,
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width: line_end_x - underline_start.x(),
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color: underline_style.color.unwrap(),
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thickness: underline_style.thickness.into(),
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squiggly: underline_style.squiggly,
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});
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}
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}
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pub fn paint_wrapped(
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&self,
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origin: Vector2F,
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visible_bounds: RectF,
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line_height: f32,
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boundaries: impl IntoIterator<Item = ShapedBoundary>,
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cx: &mut PaintContext,
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) {
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let padding_top = (line_height - self.layout.ascent - self.layout.descent) / 2.;
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let baseline_origin = vec2f(0., padding_top + self.layout.ascent);
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let mut boundaries = boundaries.into_iter().peekable();
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let mut color_runs = self.style_runs.iter();
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let mut color_end = 0;
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let mut color = Color::black();
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let mut glyph_origin = vec2f(0., 0.);
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let mut prev_position = 0.;
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for run in &self.layout.runs {
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for (glyph_ix, glyph) in run.glyphs.iter().enumerate() {
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if boundaries.peek().map_or(false, |b| b.glyph_ix == glyph_ix) {
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boundaries.next();
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glyph_origin = vec2f(0., glyph_origin.y() + line_height);
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} else {
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glyph_origin.set_x(glyph_origin.x() + glyph.position.x() - prev_position);
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}
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prev_position = glyph.position.x();
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if glyph.index >= color_end {
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if let Some(next_run) = color_runs.next() {
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color_end += next_run.0 as usize;
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color = next_run.1;
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} else {
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color_end = self.layout.len;
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color = Color::black();
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}
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}
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let glyph_bounds = RectF::new(
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origin + glyph_origin,
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cx.font_cache
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.bounding_box(run.font_id, self.layout.font_size),
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);
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if glyph_bounds.intersects(visible_bounds) {
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if glyph.is_emoji {
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cx.scene.push_image_glyph(scene::ImageGlyph {
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font_id: run.font_id,
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font_size: self.layout.font_size,
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id: glyph.id,
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origin: glyph_bounds.origin() + baseline_origin,
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});
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} else {
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cx.scene.push_glyph(scene::Glyph {
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font_id: run.font_id,
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font_size: self.layout.font_size,
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id: glyph.id,
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origin: glyph_bounds.origin() + baseline_origin,
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color,
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});
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}
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}
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}
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}
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}
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}
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impl Run {
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pub fn glyphs(&self) -> &[Glyph] {
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&self.glyphs
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}
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}
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub struct Boundary {
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pub ix: usize,
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pub next_indent: u32,
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}
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#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
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pub struct ShapedBoundary {
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pub run_ix: usize,
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pub glyph_ix: usize,
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}
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impl Boundary {
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fn new(ix: usize, next_indent: u32) -> Self {
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Self { ix, next_indent }
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}
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}
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pub struct LineWrapper {
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font_system: Arc<dyn FontSystem>,
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pub(crate) font_id: FontId,
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pub(crate) font_size: f32,
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cached_ascii_char_widths: [f32; 128],
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cached_other_char_widths: HashMap<char, f32>,
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}
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impl LineWrapper {
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pub const MAX_INDENT: u32 = 256;
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pub fn new(font_id: FontId, font_size: f32, font_system: Arc<dyn FontSystem>) -> Self {
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Self {
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font_system,
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font_id,
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font_size,
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cached_ascii_char_widths: [f32::NAN; 128],
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cached_other_char_widths: HashMap::new(),
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}
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}
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pub fn wrap_line<'a>(
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&'a mut self,
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line: &'a str,
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wrap_width: f32,
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) -> impl Iterator<Item = Boundary> + 'a {
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let mut width = 0.0;
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let mut first_non_whitespace_ix = None;
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let mut indent = None;
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let mut last_candidate_ix = 0;
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let mut last_candidate_width = 0.0;
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let mut last_wrap_ix = 0;
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let mut prev_c = '\0';
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let mut char_indices = line.char_indices();
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iter::from_fn(move || {
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for (ix, c) in char_indices.by_ref() {
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if c == '\n' {
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continue;
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}
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if self.is_boundary(prev_c, c) && first_non_whitespace_ix.is_some() {
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last_candidate_ix = ix;
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last_candidate_width = width;
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}
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if c != ' ' && first_non_whitespace_ix.is_none() {
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first_non_whitespace_ix = Some(ix);
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}
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let char_width = self.width_for_char(c);
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width += char_width;
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if width > wrap_width && ix > last_wrap_ix {
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if let (None, Some(first_non_whitespace_ix)) = (indent, first_non_whitespace_ix)
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{
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indent = Some(
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Self::MAX_INDENT.min((first_non_whitespace_ix - last_wrap_ix) as u32),
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);
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}
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if last_candidate_ix > 0 {
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last_wrap_ix = last_candidate_ix;
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width -= last_candidate_width;
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last_candidate_ix = 0;
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} else {
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last_wrap_ix = ix;
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width = char_width;
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}
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let indent_width =
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indent.map(|indent| indent as f32 * self.width_for_char(' '));
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width += indent_width.unwrap_or(0.);
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return Some(Boundary::new(last_wrap_ix, indent.unwrap_or(0)));
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}
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prev_c = c;
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|
}
|
|
|
|
None
|
|
})
|
|
}
|
|
|
|
pub fn wrap_shaped_line<'a>(
|
|
&'a mut self,
|
|
str: &'a str,
|
|
line: &'a Line,
|
|
wrap_width: f32,
|
|
) -> impl Iterator<Item = ShapedBoundary> + 'a {
|
|
let mut first_non_whitespace_ix = None;
|
|
let mut last_candidate_ix = None;
|
|
let mut last_candidate_x = 0.0;
|
|
let mut last_wrap_ix = ShapedBoundary {
|
|
run_ix: 0,
|
|
glyph_ix: 0,
|
|
};
|
|
let mut last_wrap_x = 0.;
|
|
let mut prev_c = '\0';
|
|
let mut glyphs = line
|
|
.runs()
|
|
.iter()
|
|
.enumerate()
|
|
.flat_map(move |(run_ix, run)| {
|
|
run.glyphs()
|
|
.iter()
|
|
.enumerate()
|
|
.map(move |(glyph_ix, glyph)| {
|
|
let character = str[glyph.index..].chars().next().unwrap();
|
|
(
|
|
ShapedBoundary { run_ix, glyph_ix },
|
|
character,
|
|
glyph.position.x(),
|
|
)
|
|
})
|
|
})
|
|
.peekable();
|
|
|
|
iter::from_fn(move || {
|
|
while let Some((ix, c, x)) = glyphs.next() {
|
|
if c == '\n' {
|
|
continue;
|
|
}
|
|
|
|
if self.is_boundary(prev_c, c) && first_non_whitespace_ix.is_some() {
|
|
last_candidate_ix = Some(ix);
|
|
last_candidate_x = x;
|
|
}
|
|
|
|
if c != ' ' && first_non_whitespace_ix.is_none() {
|
|
first_non_whitespace_ix = Some(ix);
|
|
}
|
|
|
|
let next_x = glyphs.peek().map_or(line.width(), |(_, _, x)| *x);
|
|
let width = next_x - last_wrap_x;
|
|
if width > wrap_width && ix > last_wrap_ix {
|
|
if let Some(last_candidate_ix) = last_candidate_ix.take() {
|
|
last_wrap_ix = last_candidate_ix;
|
|
last_wrap_x = last_candidate_x;
|
|
} else {
|
|
last_wrap_ix = ix;
|
|
last_wrap_x = x;
|
|
}
|
|
|
|
return Some(last_wrap_ix);
|
|
}
|
|
prev_c = c;
|
|
}
|
|
|
|
None
|
|
})
|
|
}
|
|
|
|
fn is_boundary(&self, prev: char, next: char) -> bool {
|
|
(prev == ' ') && (next != ' ')
|
|
}
|
|
|
|
#[inline(always)]
|
|
fn width_for_char(&mut self, c: char) -> f32 {
|
|
if (c as u32) < 128 {
|
|
let mut width = self.cached_ascii_char_widths[c as usize];
|
|
if width.is_nan() {
|
|
width = self.compute_width_for_char(c);
|
|
self.cached_ascii_char_widths[c as usize] = width;
|
|
}
|
|
width
|
|
} else {
|
|
let mut width = self
|
|
.cached_other_char_widths
|
|
.get(&c)
|
|
.copied()
|
|
.unwrap_or(f32::NAN);
|
|
if width.is_nan() {
|
|
width = self.compute_width_for_char(c);
|
|
self.cached_other_char_widths.insert(c, width);
|
|
}
|
|
width
|
|
}
|
|
}
|
|
|
|
fn compute_width_for_char(&self, c: char) -> f32 {
|
|
self.font_system
|
|
.layout_line(
|
|
&c.to_string(),
|
|
self.font_size,
|
|
&[(
|
|
1,
|
|
RunStyle {
|
|
font_id: self.font_id,
|
|
color: Default::default(),
|
|
underline: Default::default(),
|
|
},
|
|
)],
|
|
)
|
|
.width
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use crate::fonts::{Properties, Weight};
|
|
|
|
#[crate::test(self)]
|
|
fn test_wrap_line(cx: &mut crate::MutableAppContext) {
|
|
let font_cache = cx.font_cache().clone();
|
|
let font_system = cx.platform().fonts();
|
|
let family = font_cache.load_family(&["Courier"]).unwrap();
|
|
let font_id = font_cache.select_font(family, &Default::default()).unwrap();
|
|
|
|
let mut wrapper = LineWrapper::new(font_id, 16., font_system);
|
|
assert_eq!(
|
|
wrapper
|
|
.wrap_line("aa bbb cccc ddddd eeee", 72.0)
|
|
.collect::<Vec<_>>(),
|
|
&[
|
|
Boundary::new(7, 0),
|
|
Boundary::new(12, 0),
|
|
Boundary::new(18, 0)
|
|
],
|
|
);
|
|
assert_eq!(
|
|
wrapper
|
|
.wrap_line("aaa aaaaaaaaaaaaaaaaaa", 72.0)
|
|
.collect::<Vec<_>>(),
|
|
&[
|
|
Boundary::new(4, 0),
|
|
Boundary::new(11, 0),
|
|
Boundary::new(18, 0)
|
|
],
|
|
);
|
|
assert_eq!(
|
|
wrapper.wrap_line(" aaaaaaa", 72.).collect::<Vec<_>>(),
|
|
&[
|
|
Boundary::new(7, 5),
|
|
Boundary::new(9, 5),
|
|
Boundary::new(11, 5),
|
|
]
|
|
);
|
|
assert_eq!(
|
|
wrapper
|
|
.wrap_line(" ", 72.)
|
|
.collect::<Vec<_>>(),
|
|
&[
|
|
Boundary::new(7, 0),
|
|
Boundary::new(14, 0),
|
|
Boundary::new(21, 0)
|
|
]
|
|
);
|
|
assert_eq!(
|
|
wrapper
|
|
.wrap_line(" aaaaaaaaaaaaaa", 72.)
|
|
.collect::<Vec<_>>(),
|
|
&[
|
|
Boundary::new(7, 0),
|
|
Boundary::new(14, 3),
|
|
Boundary::new(18, 3),
|
|
Boundary::new(22, 3),
|
|
]
|
|
);
|
|
}
|
|
|
|
#[crate::test(self, retries = 5)]
|
|
fn test_wrap_shaped_line(cx: &mut crate::MutableAppContext) {
|
|
// This is failing intermittently on CI and we don't have time to figure it out
|
|
let font_cache = cx.font_cache().clone();
|
|
let font_system = cx.platform().fonts();
|
|
let text_layout_cache = TextLayoutCache::new(font_system.clone());
|
|
|
|
let family = font_cache.load_family(&["Helvetica"]).unwrap();
|
|
let font_id = font_cache.select_font(family, &Default::default()).unwrap();
|
|
let normal = RunStyle {
|
|
font_id,
|
|
color: Default::default(),
|
|
underline: Default::default(),
|
|
};
|
|
let bold = RunStyle {
|
|
font_id: font_cache
|
|
.select_font(
|
|
family,
|
|
&Properties {
|
|
weight: Weight::BOLD,
|
|
..Default::default()
|
|
},
|
|
)
|
|
.unwrap(),
|
|
color: Default::default(),
|
|
underline: Default::default(),
|
|
};
|
|
|
|
let text = "aa bbb cccc ddddd eeee";
|
|
let line = text_layout_cache.layout_str(
|
|
text,
|
|
16.0,
|
|
&[(4, normal), (5, bold), (6, normal), (1, bold), (7, normal)],
|
|
);
|
|
|
|
let mut wrapper = LineWrapper::new(font_id, 16., font_system);
|
|
assert_eq!(
|
|
wrapper
|
|
.wrap_shaped_line(text, &line, 72.0)
|
|
.collect::<Vec<_>>(),
|
|
&[
|
|
ShapedBoundary {
|
|
run_ix: 1,
|
|
glyph_ix: 3
|
|
},
|
|
ShapedBoundary {
|
|
run_ix: 2,
|
|
glyph_ix: 3
|
|
},
|
|
ShapedBoundary {
|
|
run_ix: 4,
|
|
glyph_ix: 2
|
|
}
|
|
],
|
|
);
|
|
}
|
|
}
|