remove fonts cache and make first attempt at font fallback

Cargo.toml

@@ -13,12 +13,10 @@ lru = "0.4.3"
 skulpin = "0.5"
 derive-new = "0.5"
 env_logger = "0.7.1"
-#neovim-lib = { git = "https://github.com/daa84/neovim-lib", version = "0.6" }
 rmpv = "0.4.2"
 msgbox = "0.4.0"
 rust-embed = { version = "5.2.0", features = ["debug-embed"] }
 image = "0.22.3"
-#nvim-rs = "0.1.0"
 nvim-rs = { git = "https://github.com/KillTheMule/nvim-rs", branch = "futures", features = [ "use_tokio" ] }
 tokio = { version = "0.2.9", features = [ "blocking", "process", "time" ] }
 async-trait = "0.1.18"

src/renderer/caching_shaper.rs

@@ -1,109 +1,194 @@
+use std::sync::Arc;
 use std::collections::HashMap;
 
 use lru::LruCache;
-use skulpin::skia_safe::{TextBlob, Font, TextBlobBuilder};
+use skulpin::skia_safe::{TextBlob, Font as SkiaFont, FontStyle, Typeface, TextBlobBuilder};
 use font_kit::source::SystemSource;
-use skribo::{layout_run, FontRef, TextStyle};
-
-use super::fonts::FontLookup;
+use skribo::{layout, layout_run, FontRef as SkriboFont, FontFamily, FontCollection, TextStyle};
 
 const STANDARD_CHARACTER_STRING: &'static str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
 
-#[derive(new, Clone, Hash, PartialEq, Eq)]
+#[cfg(target_os = "windows")]
+const DEFAULT_FONT: &str = "Consolas";
+#[cfg(target_os = "windows")]
+const EMOJI_FONT: &str = "Segoe UI Emoji";
+
+#[cfg(target_os = "macos")]
+const DEFAULT_FONT: &str = "Menlo";
+#[cfg(target_os = "macos")]
+const EMOJI_FONT: &str = "Apple COlor Emoji";
+
+#[cfg(target_os = "linux")]
+const DEFAULT_FONT: &str = "Monospace";
+#[cfg(target_os = "linux")]
+const EMOJI_FONT: &str = "Noto Color Emoji";
+
+const DEFAULT_FONT_SIZE: f32 = 14.0;
+
+
+#[derive(new, Clone, Hash, PartialEq, Eq, Debug)]
 struct FontKey {
-    pub name: String,
-    pub base_size: String, // hack because comparison of floats doesn't work
     pub scale: u16,
     pub bold: bool,
     pub italic: bool
 }
 
-#[derive(new, Clone, Hash, PartialEq, Eq)]
+#[derive(new, Clone, Hash, PartialEq, Eq, Debug)]
 struct ShapeKey {
     pub text: String,
     pub font_key: FontKey
 }
 
+struct FontPair {
+    normal: (SkiaFont, SkriboFont),
+    emoji: (SkiaFont, SkriboFont)
+}
+
+#[derive(Debug)]
 pub struct CachingShaper {
-    font_cache: LruCache<FontKey, FontRef>,
-    blob_cache: LruCache<ShapeKey, TextBlob>
+    pub font_name: String,
+    pub base_size: f32,
+    font_cache: LruCache<FontKey, FontPair>,
+    blob_cache: LruCache<ShapeKey, Vec<TextBlob>>
+}
+
+fn build_fonts(font_key: &FontKey, font_name: &str, base_size: f32) -> (SkiaFont, SkriboFont) {
+    let source = SystemSource::new();
+    let skribo_font = SkriboFont::new(
+        source.select_family_by_name(font_name)
+              .expect("Failed to load by postscript name")
+              .fonts()[0]
+              .load()
+              .unwrap());
+     
+    let font_style = match (font_key.bold, font_key.italic) {
+        (false, false) => FontStyle::normal(),
+        (true, false) => FontStyle::bold(),
+        (false, true) => FontStyle::italic(),
+        (true, true) => FontStyle::bold_italic()
+    };
+    let skia_font = SkiaFont::from_typeface(
+        Typeface::new(font_name.clone(), font_style).expect("Could not load skia font file"),
+        base_size * font_key.scale as f32);
+
+    (skia_font, skribo_font)
 }
 
 impl CachingShaper {
     pub fn new() -> CachingShaper {
         CachingShaper {
+            font_name: DEFAULT_FONT.to_string(),
+            base_size: DEFAULT_FONT_SIZE,
             font_cache: LruCache::new(100),
-            blob_cache: LruCache::new(10000)
+            blob_cache: LruCache::new(10000),
         }
     }
 
-    fn get_font(&mut self, font_key: &FontKey) -> &FontRef {
+    fn get_font_pair(&mut self, font_key: &FontKey) -> &FontPair {
         if !self.font_cache.contains(font_key) {
-            let source = SystemSource::new();
-            let font_name = font_key.name.clone();
-            let font = source
-                .select_family_by_name(&font_name)
-                .expect("Failed to load by postscript name")
-                .fonts()[0]
-                .load()
-                .unwrap();
-            self.font_cache.put(font_key.clone(), FontRef::new(font));
+            let font_pair = FontPair {
+                normal: build_fonts(font_key, &self.font_name, self.base_size),
+                emoji: build_fonts(font_key, EMOJI_FONT, self.base_size)
+            };
+            self.font_cache.put(font_key.clone(), font_pair);
         }
 
         self.font_cache.get(font_key).unwrap()
     }
 
-    pub fn shape(&mut self, text: &str, font_name: &str, base_size: f32, scale: u16, bold: bool, italic: bool, font: &Font) -> TextBlob {
-        let font_key = FontKey::new(font_name.to_string(), base_size.to_string(), scale, bold, italic);
-        let font_ref = self.get_font(&font_key);
+    pub fn shape(&mut self, text: &str, scale: u16, bold: bool, italic: bool) -> Vec<TextBlob> {
+        let base_size = self.base_size;
+        let font_key = FontKey::new(scale, bold, italic);
+        let font_pair = self.get_font_pair(&font_key);
 
         let style = TextStyle { size: base_size * scale as f32 };
-        let layout = layout_run(&style, &font_ref, text);
 
-        let mut blob_builder = TextBlobBuilder::new();
+        let mut family = FontFamily::new();
+        family.add_font(font_pair.normal.1.clone());
+        family.add_font(font_pair.emoji.1.clone());
+
+        let mut collection = FontCollection::new();
+        collection.add_family(family);
+
+        let layout = layout(&style, &collection, text);
 
-        
-        let count = layout.glyphs.len();
-        let metrics = font_ref.font.metrics();
-        let ascent = metrics.ascent * base_size / metrics.units_per_em as f32;
-        let (glyphs, positions) = blob_builder.alloc_run_pos_h(font, count, ascent, None);
+        let mut groups = Vec::new();
+        let mut group = Vec::new();
+        let mut previous_font: Option<SkriboFont> = None;
 
-        for (i, glyph_id) in layout.glyphs.iter().map(|glyph| glyph.glyph_id as u16).enumerate() {
-            glyphs[i] = glyph_id;
+        for glyph in layout.glyphs {
+            if previous_font.clone().map(|previous_font| Arc::ptr_eq(&previous_font.font, &glyph.font.font)).unwrap_or(true) {
+                group.push(glyph);
+            } else {
+                groups.push(group);
+                previous_font = Some(glyph.font.clone());
+                group = vec![glyph];
+            }
         }
-        for (i, offset) in layout.glyphs.iter().map(|glyph| glyph.offset.x as f32).enumerate() {
-            positions[i] = offset;
+        if !group.is_empty() {
+            groups.push(group);
+        }
+
+        let mut blobs = Vec::new();
+        for group in groups {
+            if group.is_empty() {
+                continue;
+            }
+
+            let skribo_font = group[0].font.clone();
+            let skia_font = if Arc::ptr_eq(&skribo_font.font, &font_pair.normal.1.font) {
+                &font_pair.normal.0
+            } else {
+                &font_pair.emoji.0
+            };
+
+            let mut blob_builder = TextBlobBuilder::new();
+
+            let count = group.len();
+            let metrics = skribo_font.font.metrics();
+            let ascent = metrics.ascent * base_size / metrics.units_per_em as f32;
+            let (glyphs, positions) = blob_builder.alloc_run_pos_h(&skia_font, count, ascent, None);
+
+            for (i, glyph_id) in group.iter().map(|glyph| glyph.glyph_id as u16).enumerate() {
+                glyphs[i] = glyph_id;
+            }
+            for (i, offset) in group.iter().map(|glyph| glyph.offset.x as f32).enumerate() {
+                positions[i] = offset;
+            }
+            blobs.push(blob_builder.make().unwrap());
         }
 
-        blob_builder.make().unwrap()
+        blobs
     }
 
-    pub fn shape_cached(&mut self, text: &str, font_name: &str, base_size: f32, scale: u16, bold: bool, italic: bool, font: &Font) -> &TextBlob {
-        let font_key = FontKey::new(font_name.to_string(), base_size.to_string(), scale, bold, italic);
+    pub fn shape_cached(&mut self, text: &str, scale: u16, bold: bool, italic: bool) -> &Vec<TextBlob> {
+        let font_key = FontKey::new(scale, bold, italic);
         let key = ShapeKey::new(text.to_string(), font_key);
         if !self.blob_cache.contains(&key) {
-            let blob = self.shape(text, font_name, base_size, scale, bold, italic, &font);
-            self.blob_cache.put(key.clone(), blob);
+            let blobs = self.shape(text, scale, bold, italic);
+            self.blob_cache.put(key.clone(), blobs);
         }
 
         self.blob_cache.get(&key).unwrap()
     }
 
-    pub fn clear(&mut self) {
+    pub fn change_font(&mut self, font_name: Option<&str>, base_size: Option<f32>) {
         self.font_cache.clear();
         self.blob_cache.clear();
+        self.font_name = font_name.unwrap_or(DEFAULT_FONT).to_string();
+        self.base_size = base_size.unwrap_or(DEFAULT_FONT_SIZE);
     }
 
-    pub fn font_base_dimensions(&mut self, font_lookup: &mut FontLookup) -> (f32, f32) {
-        let base_fonts = font_lookup.size(1);
-        let normal_font = &base_fonts.normal;
-        let (_, metrics) = normal_font.metrics();
+    pub fn font_base_dimensions(&mut self) -> (f32, f32) {
+        let base_size = self.base_size;
+        let font_key = FontKey::new(1, false, false);
+        let (skia_font, skribo_font) = &self.get_font_pair(&font_key).normal;
+
+        let (_, metrics) = skia_font.metrics();
         let font_height = metrics.descent - metrics.ascent;
 
-        let font_key = FontKey::new(font_lookup.name.to_string(), font_lookup.base_size.to_string(), 1, false, false);
-        let font_ref = self.get_font(&font_key);
-        let style = TextStyle { size: font_lookup.base_size };
-        let layout = layout_run(&style, font_ref, STANDARD_CHARACTER_STRING);
+        let style = TextStyle { size: base_size };
+        let layout = layout_run(&style, &skribo_font, STANDARD_CHARACTER_STRING);
         let glyph_offsets: Vec<f32> = layout.glyphs.iter().map(|glyph| glyph.offset.x).collect();
         let glyph_advances: Vec<f32> = glyph_offsets.windows(2).map(|pair| pair[1] - pair[0]).collect();
 
@@ -118,4 +203,12 @@ impl CachingShaper {
 
         (font_width, font_height)
     }
+
+    pub fn underline_position(&mut self, scale: u16) -> f32 {
+        let font_key = FontKey::new(scale, false, false);
+        let (skia_font, _) = &self.get_font_pair(&font_key).normal;
+
+        let (_, metrics) = skia_font.metrics();
+        metrics.underline_position().unwrap()
+    }
 }

src/renderer/cursor_renderer.rs

@@ -1,10 +1,9 @@
-use std::sync::{Arc, Mutex};
 use std::time::{Duration, Instant};
 
 use skulpin::skia_safe::{Canvas, Paint, Path, Point};
 
-use crate::renderer::{CachingShaper, FontLookup};
-use crate::editor::{EDITOR, Colors, Cursor, CursorShape, Editor};
+use crate::renderer::CachingShaper;
+use crate::editor::{EDITOR, Colors, Cursor, CursorShape};
 
 const AVERAGE_MOTION_PERCENTAGE: f32 = 0.7;
 const MOTION_PERCENTAGE_SPREAD: f32 = 0.5;
@@ -172,7 +171,7 @@ impl CursorRenderer {
             cursor: Cursor, default_colors: &Colors, 
             font_width: f32, font_height: f32,
             paint: &mut Paint, shaper: &mut CachingShaper, 
-            fonts_lookup: &mut FontLookup, canvas: &mut Canvas) -> (bool, Option<Instant>) {
+            canvas: &mut Canvas) -> (bool, Option<Instant>) {
         let (render, scheduled_update) = self.blink_status.update_status(&cursor);
 
         self.previous_position = {
@@ -233,9 +232,10 @@ impl CursorRenderer {
             canvas.save();
             canvas.clip_path(&path, None, Some(false));
             
-            canvas.draw_text_blob(
-                shaper.shape_cached(&character.to_string(), &fonts_lookup.name.clone(), fonts_lookup.base_size, 1, false, false, &fonts_lookup.size(1).normal), 
-                destination, &paint);
+            let blobs = &shaper.shape_cached(&character.to_string(), 1, false, false);
+            for blob in blobs.iter() {
+                canvas.draw_text_blob(&blob, destination, &paint);
+            }
             canvas.restore();
         }
 

src/renderer/fonts.rs

@@ -1,83 +0,0 @@
-use std::collections::HashMap;
-use skulpin::skia_safe::{Typeface, Font, FontStyle};
-use crate::editor::Style;
-
-pub struct Fonts {
-    pub name: String,
-    pub size: f32,
-    pub normal: Font,
-    pub bold: Font,
-    pub italic: Font,
-    pub bold_italic: Font
-}
-
-impl Fonts {
-    fn new(name: &str, size: f32) -> Fonts {
-        let normal = Font::from_typeface(
-            Typeface::new(name, FontStyle::normal()).expect("Could not load normal font file"),
-            size);
-        let mut bold = Font::from_typeface(
-            Typeface::new(name, FontStyle::bold()).expect("Could not load bold font file"),
-            size);
-        if bold.is_embolden() {
-            dbg!("Disabled embolden for normal bold");
-            bold.set_embolden(false);
-        }
-
-        let italic = Font::from_typeface(
-            Typeface::new(name, FontStyle::italic()).expect("Could not load italic font file"),
-            size);
-        let mut bold_italic = Font::from_typeface(
-            Typeface::new(name, FontStyle::bold_italic()).expect("Could not load bold italic font file"),
-            size);
-
-        if bold_italic.is_embolden() {
-            dbg!("Disabled embolden for italic bold");
-            bold_italic.set_embolden(false);
-        }
-
-        Fonts {
-            name: name.to_string(), size, 
-            normal, bold, italic, bold_italic 
-        }
-    }
-
-    pub fn get(&self, style: &Style) -> &Font {
-        match (style.bold, style.italic) {
-            (false, false) => &self.normal,
-            (true, false) => &self.bold,
-            (false, true)  => &self.italic,
-            (true, true) => &self.bold_italic
-        }
-    }
-}
-
-pub struct FontLookup {
-    pub name: String,
-    pub base_size: f32,
-    pub loaded_fonts: HashMap<u16, Fonts>
-}
-
-impl FontLookup {
-    pub fn new(name: &str, base_size: f32) -> FontLookup {
-        let mut lookup = FontLookup {
-            name: name.to_string(),
-            base_size,
-            loaded_fonts: HashMap::new()
-        };
-
-        lookup.size(1);
-        lookup.size(2);
-        lookup.size(3);
-
-        lookup
-    }
-
-    pub fn size(&mut self, size_multiplier: u16) -> &Fonts {
-        let name = self.name.clone();
-        let base_size = self.base_size;
-        self.loaded_fonts.entry(size_multiplier).or_insert_with(|| {
-            Fonts::new(&name, base_size * size_multiplier as f32)
-        })
-    }
-}

src/renderer/mod.rs

@@ -1,4 +1,3 @@
-use std::sync::{Arc, Mutex};
 use std::time::Instant;
 
 use skulpin::CoordinateSystemHelper;
@@ -7,16 +6,11 @@ use skulpin::skia_safe::gpu::SurfaceOrigin;
 
 mod caching_shaper;
 mod cursor_renderer;
-mod fonts;
 
 pub use caching_shaper::CachingShaper;
 
 use cursor_renderer::CursorRenderer;
-use fonts::FontLookup;
-use crate::editor::{EDITOR, Editor, Style, Colors};
-
-const DEFAULT_FONT_NAME: &str = "Delugia Nerd Font";
-const DEFAULT_FONT_SIZE: f32 = 14.0;
+use crate::editor::{EDITOR, Style, Colors};
 
 #[derive(new)]
 pub struct DrawResult {
@@ -28,7 +22,6 @@ pub struct DrawResult {
 pub struct Renderer {
     surface: Option<Surface>,
     paint: Paint,
-    fonts_lookup: FontLookup,
     shaper: CachingShaper,
 
     pub font_width: f32,
@@ -44,17 +37,15 @@ impl Renderer {
         
         let mut shaper = CachingShaper::new();
 
-        let mut fonts_lookup = FontLookup::new(DEFAULT_FONT_NAME, DEFAULT_FONT_SIZE);
-        let (font_width, font_height) = shaper.font_base_dimensions(&mut fonts_lookup);
+        let (font_width, font_height) = shaper.font_base_dimensions();
         let cursor_renderer = CursorRenderer::new();
 
-        Renderer { surface, paint, fonts_lookup, shaper, font_width, font_height, cursor_renderer }
+        Renderer { surface, paint, shaper, font_width, font_height, cursor_renderer }
     }
 
-    fn set_font(&mut self, name: &str, size: f32) {
-        self.fonts_lookup = FontLookup::new(name, size);
-        self.shaper.clear();
-        let (font_width, font_height) = self.shaper.font_base_dimensions(&mut self.fonts_lookup);
+    fn set_font(&mut self, name: Option<&str>, size: Option<f32>) {
+        self.shaper.change_font(name, size);
+        let (font_width, font_height) = self.shaper.font_base_dimensions();
         self.font_width = font_width;
         self.font_height = font_height;
     }
@@ -70,7 +61,7 @@ impl Renderer {
 
     fn draw_background(&mut self, canvas: &mut Canvas, text: &str, grid_pos: (u64, u64), size: u16, style: &Option<Style>, default_colors: &Colors) {
         let region = self.compute_text_region(text, grid_pos, size);
-        let style = style.clone().unwrap_or(Style::new(default_colors.clone()));
+        let style = style.clone().unwrap_or_else(|| Style::new(default_colors.clone()));
 
         self.paint.set_color(style.background(default_colors).to_color());
         canvas.draw_rect(region, &self.paint);
@@ -82,7 +73,7 @@ impl Renderer {
         let y = grid_y as f32 * self.font_height;
         let width = text.chars().count() as f32 * self.font_width;
 
-        let style = style.clone().unwrap_or(Style::new(default_colors.clone()));
+        let style = style.clone().unwrap_or_else(|| Style::new(default_colors.clone()));
 
         canvas.save();
 
@@ -91,21 +82,17 @@ impl Renderer {
         canvas.clip_rect(region, None, Some(false));
 
         if style.underline || style.undercurl {
-            let (_, metrics) = self.fonts_lookup.size(size).get(&style).metrics();
-            let line_position = metrics.underline_position().unwrap();
-
+            let line_position = self.shaper.underline_position(size);
             self.paint.set_color(style.special(&default_colors).to_color());
             canvas.draw_line((x, y - line_position + self.font_height), (x + width, y - line_position + self.font_height), &self.paint);
         }
 
         self.paint.set_color(style.foreground(&default_colors).to_color());
         let text = text.trim_end();
-        if text.len() > 0 {
-            let font_name = self.fonts_lookup.name.clone();
-            let font_size = self.fonts_lookup.base_size;
-            let font = self.fonts_lookup.size(size).get(&style);
-            let blob = self.shaper.shape_cached(text, &font_name, font_size, size, style.bold, style.italic, font);
-            canvas.draw_text_blob(blob, (x, y), &self.paint);
+        if !text.is_empty() {
+            for blob in self.shaper.shape_cached(text, size, style.bold, style.italic).iter() {
+                canvas.draw_text_blob(blob, (x, y), &self.paint);
+            }
         }
 
         if style.strikethrough {
@@ -125,15 +112,15 @@ impl Renderer {
                 editor.default_colors.clone(), 
                 editor.cursor.clone(),
                 editor.font_name.clone(),
-                editor.font_size.clone()
+                editor.font_size
             )
         };
 
         let font_changed = 
-            font_name.clone().map(|new_name| new_name != self.fonts_lookup.name).unwrap_or(false) || 
-            font_size.map(|new_size| new_size != self.fonts_lookup.base_size).unwrap_or(false);
+            font_name.clone().map(|new_name| new_name != self.shaper.font_name).unwrap_or(false) || 
+            font_size.map(|new_size| (new_size - self.shaper.base_size).abs() > std::f32::EPSILON).unwrap_or(false);
         if font_changed {
-            self.set_font(&font_name.unwrap_or(DEFAULT_FONT_NAME.to_string()), font_size.unwrap_or(DEFAULT_FONT_SIZE));
+            self.set_font(font_name.as_deref(), font_size);
         }
 
         if should_clear {
@@ -171,9 +158,9 @@ impl Renderer {
         let (cursor_animating, scheduled_cursor_update) = self.cursor_renderer.draw(
             cursor, &default_colors, 
             self.font_width, self.font_height, 
-            &mut self.paint, &mut self.shaper, 
-            &mut self.fonts_lookup, gpu_canvas);
+            &mut self.paint, &mut self.shaper,
+            gpu_canvas);
 
-        DrawResult::new(draw_commands.len() > 0 || cursor_animating, font_changed, scheduled_cursor_update)
+        DrawResult::new(!draw_commands.is_empty() || cursor_animating, font_changed, scheduled_cursor_update)
     }
 }