Add locale support to dwrite backend

Author: ebraminio

src/hb-directwrite.cc

@@ -688,14 +688,16 @@ _hb_directwrite_shape(hb_shape_plan_t    *shape_plan,
 
   bool backward = HB_DIRECTION_IS_BACKWARD(buffer->props.direction);
 
+  wchar_t w_lang[4];
+  mbstowcs(w_lang, hb_language_to_string(buffer->props.language), 10);
   hr = analyzer->GetGlyphs(pchars, length,
     fontFace, FALSE,
     buffer->props.direction,
-    &runHead->mScript, NULL, NULL, NULL, NULL, 0,
+	&runHead->mScript, (const wchar_t*)w_lang, NULL, NULL, NULL, 0,
     maxGlyphs, clusters, textProperties,
     glyphs, glyphProperties, &actualGlyphs);
 
-  if (hr != HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER)) {
+  if (hr == HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER)) {
     free(clusters);
     free(glyphs);
     free(textProperties);
@@ -711,7 +713,7 @@ _hb_directwrite_shape(hb_shape_plan_t    *shape_plan,
     hr = analyzer->GetGlyphs(pchars, length,
       fontFace, FALSE,
       buffer->props.direction,
-      &runHead->mScript, NULL, NULL, NULL, NULL, 0,
+	  &runHead->mScript, (const wchar_t*)w_lang, NULL, NULL, NULL, 0,
       maxGlyphs, clusters, textProperties,
       glyphs, glyphProperties, &actualGlyphs);
   }