Add new public API: FcCharSetDelChar()

doc/fccharset.fncs

@@ -51,6 +51,17 @@ returning FcFalse on failure, either as a result of a constant set or from
 running out of memory. 
 @@
 
+@RET@		FcBool 
+@FUNC@		FcCharSetDelChar
+@TYPE1@		FcCharSet *		@ARG1@		fcs
+@TYPE2@		FcChar32% 		@ARG2@		ucs4 
+@PURPOSE@	Add a character to a charset
+@DESC@
+<function>FcCharSetDelChar</function> deletes a single unicode char from the set,
+returning FcFalse on failure, either as a result of a constant set or from
+running out of memory.
+@@
+
 @RET@		FcCharSet *
 @FUNC@		FcCharSetCopy
 @TYPE1@		FcCharSet *		@ARG1@		src

fontconfig/fontconfig.h

@@ -423,6 +423,9 @@ FcCharSetDestroy (FcCharSet *fcs);
 FcPublic FcBool
 FcCharSetAddChar (FcCharSet *fcs, FcChar32 ucs4);
 
+FcPublic FcBool
+FcCharSetDelChar (FcCharSet *fcs, FcChar32 ucs4);
+
 FcPublic FcCharSet*
 FcCharSetCopy (FcCharSet *src);
 

src/fccharset.c

@@ -262,6 +262,23 @@ FcCharSetAddChar (FcCharSet *fcs, FcChar32 ucs4)
     return FcTrue;
 }
 
+FcBool
+FcCharSetDelChar (FcCharSet *fcs, FcChar32 ucs4)
+{
+    FcCharLeaf	*leaf;
+    FcChar32	*b;
+
+    if (fcs->ref == FC_REF_CONSTANT)
+	return FcFalse;
+    leaf = FcCharSetFindLeaf (fcs, ucs4);
+    if (!leaf)
+	return FcTrue;
+    b = &leaf->map[(ucs4 & 0xff) >> 5];
+    *b &= ~(1 << (ucs4 & 0x1f));
+    /* We don't bother removing the leaf if it's empty */
+    return FcTrue;
+}
+
 /*
  * An iterator for the leaves of a charset
  */