Add CFX_FontMapper::IsBuiltinFace() in master branch

core/src/fxge/ge/fx_ge_fontmap.cpp

Index: core/src/fxge/ge/fx_ge_fontmap.cpp
diff --git a/core/src/fxge/ge/fx_ge_fontmap.cpp b/core/src/fxge/ge/fx_ge_fontmap.cpp
index 77f94865605476e0c759eb78b945fe73ab3ac0f5..29a29db6fe080820e663f2ebcb188edfdebe5edc 100644
--- a/core/src/fxge/ge/fx_ge_fontmap.cpp
+++ b/core/src/fxge/ge/fx_ge_fontmap.cpp
@@ -1214,6 +1214,17 @@ FXFT_Face CFX_FontMapper::FindSubstFont(const CFX_ByteString& name,
   m_pFontInfo->DeleteFont(hFont);
   return face;
 }
+FX_BOOL CFX_FontMapper::IsBuiltinFace(const FXFT_Face face) const {
+  for (int i = 0; i < MM_FACE_COUNT; ++i) {
+    if (m_MMFaces[i] == face)
+      return TRUE;
+  }
+  for (int i = 0; i < FOXIT_FACE_COUNT; ++i) {
+    if (m_FoxitFaces[i] == face)
+      return TRUE;
+  }
+  return FALSE;
+}
 extern "C" {
 unsigned long _FTStreamRead(FXFT_Stream stream,
                             unsigned long offset,