Add fallback fonts in pdfium

core/fpdfapi/fpdf_font/include/cpdf_font.h

Index: core/fpdfapi/fpdf_font/include/cpdf_font.h
diff --git a/core/fpdfapi/fpdf_font/include/cpdf_font.h b/core/fpdfapi/fpdf_font/include/cpdf_font.h
index a76a6a25734eb7005b65734f3deda31fb1dae285..dca31731040aa4445b816fad349f0a2e0cb8b51e 100644
--- a/core/fpdfapi/fpdf_font/include/cpdf_font.h
+++ b/core/fpdfapi/fpdf_font/include/cpdf_font.h
@@ -71,6 +71,11 @@ class CPDF_Font {
   virtual int GlyphFromCharCodeExt(uint32_t charcode);
   virtual CFX_WideString UnicodeFromCharCode(uint32_t charcode) const;
   virtual uint32_t CharCodeFromUnicode(FX_WCHAR Unicode) const;
+  virtual uint32_t FallbackFontFromCharcode(uint32_t charcode,

[dsinclair, 2016/08/23 19:41:18]

Are either of these overridden by subclasses? If not, lets remove the virtual
for now.

[npm, 2016/08/23 20:36:57]

Done.

+                                            bool* pVertGlyph);
+  virtual int FallbackGlyphFromCharcode(int fallbackFont,
+                                        uint32_t charcode,
+                                        bool* pVertGlyph);
 
   const CFX_ByteString& GetBaseFont() const { return m_BaseFont; }
   CFX_SubstFont* GetSubstFont() const { return m_Font.GetSubstFont(); }
@@ -94,6 +99,7 @@ class CPDF_Font {
 
   CPDF_Document* m_pDocument;
   CFX_Font m_Font;
+  std::vector<CFX_Font*> m_FontPlusFallbacks;
 
  protected:
   CPDF_Font();