Add editing langset feature.

[fontconfig.git] / src / fclang.c

diff --git a/src/fclang.c b/src/fclang.c
index 1c78328048bb385003ffc43d24e00699a6eb356b..be42b58c4694f54747c395ab28011a490a7a4dbc 100644 (file)
--- a/src/fclang.c
+++ b/src/fclang.c
@@ -71,6 +71,20 @@ FcLangSetBitGet (const FcLangSet *ls,
   return ((ls->map[bucket] >> (id & 0x1f)) & 1) ? FcTrue : FcFalse;
 }
 
+static void
+FcLangSetBitReset (FcLangSet    *ls,
+                  unsigned int  id)
+{
+  int bucket;
+
+  id = fcLangCharSetIndices[id];
+  bucket = id >> 5;
+  if (bucket >= ls->map_size)
+    return; /* shouldn't happen really */
+
+  ls->map[bucket] &= ~((FcChar32) 1 << (id & 0x1f));
+}
+
 FcLangSet *
 FcFreeTypeLangSet (const FcCharSet  *charset,
                   const FcChar8    *exclusiveLang)
@@ -400,6 +414,23 @@ FcLangSetAdd (FcLangSet *ls, const FcChar8 *lang)
     return FcStrSetAdd (ls->extra, lang);
 }
 
+FcBool
+FcLangSetDel (FcLangSet *ls, const FcChar8 *lang)
+{
+    int        id;
+
+    id = FcLangSetIndex (lang);
+    if (id >= 0)
+    {
+       FcLangSetBitReset (ls, id);
+    }
+    else if (ls->extra)
+    {
+       FcStrSetDel (ls->extra, lang);
+    }
+    return FcTrue;
+}
+
 FcLangResult
 FcLangSetHasLang (const FcLangSet *ls, const FcChar8 *lang)
 {
@@ -818,6 +849,37 @@ FcLangSetGetLangs (const FcLangSet *ls)
     return langs;
 }
 
+static FcLangSet *
+FcLangSetOperate(const FcLangSet       *a,
+                const FcLangSet        *b,
+                FcBool                 (*func) (FcLangSet      *ls,
+                                                const FcChar8  *s))
+{
+    FcLangSet  *langset = FcLangSetCopy (a);
+    FcStrList  *sl = FcStrListCreate (FcLangSetGetLangs (b));
+    FcChar8    *str;
+
+    while ((str = FcStrListNext (sl)))
+    {
+       func (langset, str);
+    }
+    FcStrListDone (sl);
+
+    return langset;
+}
+
+FcLangSet *
+FcLangSetUnion (const FcLangSet *a, const FcLangSet *b)
+{
+    return FcLangSetOperate(a, b, FcLangSetAdd);
+}
+
+FcLangSet *
+FcLangSetSubtract (const FcLangSet *a, const FcLangSet *b)
+{
+    return FcLangSetOperate(a, b, FcLangSetDel);
+}
+
 #define __fclang__
 #include "fcaliastail.h"
 #include "fcftaliastail.h"