1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155

use std::cell::RefCell;
use std::collections::HashMap;

use lru::LruCache;
use usvg::fontdb;
use usvg::Options;

use geom::Bounds;

use crate::text::Font;
use crate::{text, EventCtx, GeomBatch, GfxCtx, Prerender};

// TODO We don't need refcell maybe? Can we take &mut Assets?
pub struct Assets {
    pub default_line_height: RefCell<f64>,
    text_cache: RefCell<LruCache<String, GeomBatch>>,
    line_height_cache: RefCell<HashMap<(Font, usize), f64>>,
    // Keyed by filename, then scale factor mangled into a hashable form. Tuple doesn't work
    // because of borrowing.
    svg_cache: RefCell<HashMap<String, (GeomBatch, Bounds)>>,
    font_to_id: HashMap<Font, fontdb::ID>,
    pub text_opts: Options,
    pub read_svg: Box<dyn Fn(&str) -> Vec<u8>>,
}

impl Assets {
    pub fn new(read_svg: Box<dyn Fn(&str) -> Vec<u8>>) -> Assets {
        let mut a = Assets {
            default_line_height: RefCell::new(0.0),
            text_cache: RefCell::new(LruCache::new(500)),
            line_height_cache: RefCell::new(HashMap::new()),
            svg_cache: RefCell::new(HashMap::new()),
            font_to_id: HashMap::new(),
            text_opts: Options::default(),
            read_svg,
        };
        // All fonts are statically bundled with the library right now, on both native and web.
        // Eventually need to let people specify their own fonts dynamically at runtime.
        a.text_opts.fontdb = fontdb::Database::new();
        a.text_opts
            .fontdb
            .load_font_data(include_bytes!("../fonts/BungeeInline-Regular.ttf").to_vec());
        a.text_opts
            .fontdb
            .load_font_data(include_bytes!("../fonts/Bungee-Regular.ttf").to_vec());
        a.text_opts
            .fontdb
            .load_font_data(include_bytes!("../fonts/Overpass-Bold.ttf").to_vec());
        a.text_opts
            .fontdb
            .load_font_data(include_bytes!("../fonts/OverpassMono-Bold.ttf").to_vec());
        a.text_opts
            .fontdb
            .load_font_data(include_bytes!("../fonts/Overpass-Regular.ttf").to_vec());
        a.text_opts
            .fontdb
            .load_font_data(include_bytes!("../fonts/Overpass-SemiBold.ttf").to_vec());
        a.text_opts
            .fontdb
            .load_font_data(include_bytes!("../fonts/ZCOOLXiaoWei-Regular.ttf").to_vec());
        for font in vec![
            Font::BungeeInlineRegular,
            Font::BungeeRegular,
            Font::OverpassBold,
            Font::OverpassRegular,
            Font::OverpassSemiBold,
            Font::OverpassMonoBold,
            Font::ZcoolXiaoWei,
        ] {
            a.font_to_id.insert(
                font,
                a.text_opts
                    .fontdb
                    .query(&fontdb::Query {
                        families: &vec![fontdb::Family::Name(font.family())],
                        weight: match font {
                            Font::OverpassBold | Font::OverpassMonoBold => fontdb::Weight::BOLD,
                            Font::OverpassSemiBold => fontdb::Weight::SEMIBOLD,
                            _ => fontdb::Weight::NORMAL,
                        },
                        stretch: fontdb::Stretch::Normal,
                        style: fontdb::Style::Normal,
                    })
                    .unwrap(),
            );
        }
        *a.default_line_height.borrow_mut() =
            a.line_height(text::DEFAULT_FONT, text::DEFAULT_FONT_SIZE);
        a
    }

    pub fn line_height(&self, font: Font, font_size: usize) -> f64 {
        let key = (font, font_size);
        if let Some(height) = self.line_height_cache.borrow().get(&key) {
            return *height;
        }

        // This seems to be missing line_gap, and line_gap is 0, so manually adjust here.
        let line_height = self
            .text_opts
            .fontdb
            .with_face_data(self.font_to_id[&font], |data, face_index| {
                let font = ttf_parser::Face::from_slice(data, face_index).unwrap();
                let units_per_em = font.units_per_em().unwrap();
                let ascent = font.ascender();
                let descent = font.descender();
                let scale = (font_size as f64) / (units_per_em as f64);
                ((ascent - descent) as f64) * scale
            })
            .unwrap();
        let height = text::SCALE_LINE_HEIGHT * line_height;

        self.line_height_cache.borrow_mut().insert(key, height);
        height
    }

    pub fn get_cached_text(&self, key: &String) -> Option<GeomBatch> {
        self.text_cache.borrow_mut().get(key).cloned()
    }
    pub fn cache_text(&self, key: String, geom: GeomBatch) {
        self.text_cache.borrow_mut().put(key, geom);
    }

    pub fn get_cached_svg(&self, key: &str) -> Option<(GeomBatch, Bounds)> {
        self.svg_cache.borrow().get(key).cloned()
    }

    pub fn cache_svg(&self, key: String, geom: GeomBatch, bounds: Bounds) {
        self.svg_cache.borrow_mut().insert(key, (geom, bounds));
    }
}

impl std::convert::AsRef<Assets> for GfxCtx<'_> {
    fn as_ref(&self) -> &Assets {
        &self.prerender.assets
    }
}

impl std::convert::AsRef<Assets> for EventCtx<'_> {
    fn as_ref(&self) -> &Assets {
        &self.prerender.assets
    }
}

impl std::convert::AsRef<Assets> for Prerender {
    fn as_ref(&self) -> &Assets {
        &self.assets
    }
}

impl std::convert::AsRef<Assets> for Assets {
    fn as_ref(&self) -> &Assets {
        &self
    }
}