1 files changed, 41 insertions, 2 deletions

diff --git a/font/src/ft/fc/char_set.rs b/font/src/ft/fc/char_set.rs
index 89554458..4bba4818 100644
--- a/font/src/ft/fc/char_set.rs
+++ b/font/src/ft/fc/char_set.rs
@@ -13,15 +13,19 @@
 // limitations under the License.
 use std::ptr::NonNull;
 
-use foreign_types::{foreign_type, ForeignTypeRef};
+use foreign_types::{foreign_type, ForeignType, ForeignTypeRef};
 
 use super::ffi::FcCharSetCreate;
-use super::ffi::{FcCharSet, FcCharSetAddChar, FcCharSetDestroy};
+use super::ffi::{
+    FcBool, FcCharSet, FcCharSetAddChar, FcCharSetCopy, FcCharSetCount, FcCharSetDestroy,
+    FcCharSetHasChar, FcCharSetMerge, FcCharSetSubtract, FcCharSetUnion,
+};
 
 foreign_type! {
     pub unsafe type CharSet {
         type CType = FcCharSet;
         fn drop = FcCharSetDestroy;
+        fn clone = FcCharSetCopy;
     }
 }
 
@@ -41,4 +45,39 @@ impl CharSetRef {
     pub fn add(&mut self, glyph: char) -> bool {
         unsafe { FcCharSetAddChar(self.as_ptr(), glyph as _) == 1 }
     }
+
+    pub fn has_char(&self, glyph: char) -> bool {
+        unsafe { FcCharSetHasChar(self.as_ptr(), glyph as _) == 1 }
+    }
+
+    pub fn count(&self) -> u32 {
+        unsafe { FcCharSetCount(self.as_ptr()) as u32 }
+    }
+
+    pub fn union(&self, other: &CharSetRef) -> CharSet {
+        unsafe {
+            let ptr = FcCharSetUnion(self.as_ptr() as _, other.as_ptr() as _);
+            CharSet::from_ptr(ptr)
+        }
+    }
+
+    pub fn subtract(&self, other: &CharSetRef) -> CharSet {
+        unsafe {
+            let ptr = FcCharSetSubtract(self.as_ptr() as _, other.as_ptr() as _);
+            CharSet::from_ptr(ptr)
+        }
+    }
+
+    pub fn merge(&self, other: &CharSetRef) -> Result<bool, ()> {
+        unsafe {
+            // Value is just an indicator whether something was added or not
+            let mut value: FcBool = 0;
+            let res = FcCharSetMerge(self.as_ptr() as _, other.as_ptr() as _, &mut value);
+            if res == 0 {
+                Err(())
+            } else {
+                Ok(value != 0)
+            }
+        }
+    }
 }