skia_safe/utils/
ordered_font_mgr.rs

1use crate::{prelude::*, FontMgr};
2use skia_bindings::{self as sb, SkOrderedFontMgr, SkRefCntBase};
3use std::{
4    fmt,
5    mem::transmute,
6    ops::{Deref, DerefMut},
7};
8
9pub type OrderedFontMgr = RCHandle<SkOrderedFontMgr>;
10require_base_type!(SkOrderedFontMgr, sb::SkFontMgr);
11
12impl NativeRefCountedBase for SkOrderedFontMgr {
13    type Base = SkRefCntBase;
14}
15
16impl Deref for OrderedFontMgr {
17    type Target = FontMgr;
18    fn deref(&self) -> &Self::Target {
19        unsafe { transmute_ref(self) }
20    }
21}
22
23impl DerefMut for OrderedFontMgr {
24    fn deref_mut(&mut self) -> &mut Self::Target {
25        unsafe { transmute_ref_mut(self) }
26    }
27}
28
29impl Default for OrderedFontMgr {
30    fn default() -> Self {
31        Self::new()
32    }
33}
34
35impl From<OrderedFontMgr> for FontMgr {
36    fn from(font_mgr: OrderedFontMgr) -> Self {
37        unsafe { transmute(font_mgr) }
38    }
39}
40
41impl fmt::Debug for OrderedFontMgr {
42    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
43        f.debug_struct("OrderedFontMgr")
44            .field("base", self as &FontMgr)
45            .finish()
46    }
47}
48
49impl OrderedFontMgr {
50    pub fn new() -> Self {
51        Self::from_ptr(unsafe { sb::C_SkOrderedFontMgr_new() }).unwrap()
52    }
53
54    pub fn append(&mut self, font_mgr: impl Into<FontMgr>) {
55        let font_mgr = font_mgr.into();
56        unsafe { sb::C_SkOrderedFontMgr_append(self.native_mut(), font_mgr.into_ptr()) }
57    }
58}
59
60#[cfg(test)]
61mod tests {
62    use super::OrderedFontMgr;
63
64    #[test]
65    fn can_use_font_mgr_functions() {
66        let ordered = OrderedFontMgr::default();
67        let _families = ordered.count_families();
68    }
69
70    #[test]
71    fn can_pass_ordered_font_mgr_where_a_font_mgr_is_expected() {
72        let mut ordered = OrderedFontMgr::default();
73        let another = OrderedFontMgr::default();
74        ordered.append(another);
75    }
76
77    #[test]
78    #[cfg(feature = "textlayout")]
79    fn can_find_fonts_in_multiple_mgrs() {
80        use super::FontMgr;
81        use crate::textlayout::TypefaceFontProvider;
82        use std::fs;
83        use std::path::Path;
84
85        let sys_mgr = FontMgr::default();
86        let single_font_provider = |filename: &str| {
87            let path = Path::new(filename);
88            let font_data = fs::read(path).unwrap();
89            let font = sys_mgr.new_from_data(&font_data, None).unwrap();
90            let mut provider = TypefaceFontProvider::new();
91            provider.register_typeface(font, None);
92            provider
93        };
94
95        // create two TypefaceFontProviders, each with only a single font
96        let bungee_provider = single_font_provider(
97            "../skia-bindings/skia/modules/canvaskit/tests/assets/Bungee-Regular.ttf",
98        );
99        let noto_provider = single_font_provider(
100            "../skia-bindings/skia/modules/canvaskit/tests/assets/NotoSerif-Regular.ttf",
101        );
102
103        // add both providers to an OrderedFontMgr, then ensure both can be found
104        let mut ordered = OrderedFontMgr::new();
105        ordered.append(bungee_provider.clone());
106        ordered.append(noto_provider.clone());
107        assert_eq!(ordered.match_family("Bungee").count(), 1);
108        assert_eq!(ordered.match_family("Noto Serif").count(), 1);
109        assert_eq!(ordered.match_family("Nonesuch").count(), 0);
110    }
111}
skia_safe/utils/ordered_font_mgr.rs

skia_safe/utils/
ordered_font_mgr.rs
