skia_safe/utils/
ordered_font_mgr.rs

1use std::{fmt, mem::transmute, ops::Deref};
2
3use crate::{prelude::*, FontMgr};
4use skia_bindings::{self as sb, SkOrderedFontMgr, SkRefCntBase};
5
6pub type OrderedFontMgr = RCHandle<SkOrderedFontMgr>;
7require_base_type!(SkOrderedFontMgr, sb::SkFontMgr);
8
9impl NativeRefCountedBase for SkOrderedFontMgr {
10    type Base = SkRefCntBase;
11}
12
13impl Deref for OrderedFontMgr {
14    type Target = FontMgr;
15    fn deref(&self) -> &Self::Target {
16        unsafe { transmute_ref(self) }
17    }
18}
19
20impl Default for OrderedFontMgr {
21    fn default() -> Self {
22        Self::new()
23    }
24}
25
26impl From<OrderedFontMgr> for FontMgr {
27    fn from(font_mgr: OrderedFontMgr) -> Self {
28        unsafe { transmute(font_mgr) }
29    }
30}
31
32impl fmt::Debug for OrderedFontMgr {
33    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
34        f.debug_struct("OrderedFontMgr")
35            .field("base", self as &FontMgr)
36            .finish()
37    }
38}
39
40impl OrderedFontMgr {
41    pub fn new() -> Self {
42        Self::from_ptr(unsafe { sb::C_SkOrderedFontMgr_new() }).unwrap()
43    }
44
45    pub fn append(&mut self, font_mgr: impl Into<FontMgr>) {
46        let font_mgr = font_mgr.into();
47        unsafe { sb::C_SkOrderedFontMgr_append(self.native_mut(), font_mgr.into_ptr()) }
48    }
49}
50
51#[cfg(test)]
52mod tests {
53    use super::OrderedFontMgr;
54
55    #[test]
56    fn can_use_font_mgr_functions() {
57        let ordered = OrderedFontMgr::default();
58        let _families = ordered.count_families();
59    }
60
61    #[test]
62    fn can_pass_ordered_font_mgr_where_a_font_mgr_is_expected() {
63        let mut ordered = OrderedFontMgr::default();
64        let another = OrderedFontMgr::default();
65        ordered.append(another);
66    }
67
68    #[test]
69    #[cfg(feature = "textlayout")]
70    fn can_find_fonts_in_multiple_mgrs() {
71        use super::FontMgr;
72        use crate::textlayout::TypefaceFontProvider;
73        use std::fs;
74        use std::path::Path;
75
76        let sys_mgr = FontMgr::default();
77        let single_font_provider = |filename: &str| {
78            let path = Path::new(filename);
79            let font_data = fs::read(path).unwrap();
80            let font = sys_mgr.new_from_data(&font_data, None).unwrap();
81            let mut provider = TypefaceFontProvider::new();
82            provider.register_typeface(font, None);
83            provider
84        };
85
86        // create two TypefaceFontProviders, each with only a single font
87        let bungee_provider = single_font_provider(
88            "../skia-bindings/skia/modules/canvaskit/tests/assets/Bungee-Regular.ttf",
89        );
90        let noto_provider = single_font_provider(
91            "../skia-bindings/skia/modules/canvaskit/tests/assets/NotoSerif-Regular.ttf",
92        );
93
94        // add both providers to an OrderedFontMgr, then ensure both can be found
95        let mut ordered = OrderedFontMgr::new();
96        ordered.append(bungee_provider.clone());
97        ordered.append(noto_provider.clone());
98        assert_eq!(ordered.match_family("Bungee").count(), 1);
99        assert_eq!(ordered.match_family("Noto Serif").count(), 1);
100        assert_eq!(ordered.match_family("Nonesuch").count(), 0);
101    }
102}
skia_safe/utils/ordered_font_mgr.rs

skia_safe/utils/
ordered_font_mgr.rs
