Fix spaces too wide in XFA Dropdown.

CFGAS_PDFFontMgr::GetCharWidth() is only used for spaces, for no
good reason I could find. It's broken in this case too, returning
a default value of 600 for any character.

This CL removes this method and its only usage that led to finding
this issue.

Bug: pdfium:1083
Change-Id: I954de45101715b5af05169612fb5eca1b1a170b4
Reviewed-on: https://pdfium-review.googlesource.com/32740
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

4 files changed, 13 insertions, 41 deletions

diff --git a/xfa/fgas/font/cfgas_gefont.cpp b/xfa/fgas/font/cfgas_gefont.cpp
index b6ec23a414..740504f088 100644
--- a/xfa/fgas/font/cfgas_gefont.cpp
+++ b/xfa/fgas/font/cfgas_gefont.cpp
@@ -164,23 +164,21 @@ bool CFGAS_GEFont::GetCharWidth(wchar_t wUnicode, int32_t* pWidth) {
   if (*pWidth > 0)
     return true;
 
-  if (!m_pProvider || !m_pProvider->GetCharWidth(RetainPtr<CFGAS_GEFont>(this),
-                                                 wUnicode, pWidth)) {
-    RetainPtr<CFGAS_GEFont> pFont;
-    int32_t iGlyph;
-    std::tie(iGlyph, pFont) = GetGlyphIndexAndFont(wUnicode, true);
-    if (iGlyph != 0xFFFF && pFont) {
-      if (pFont.Get() == this) {
-        *pWidth = m_pFont->GetGlyphWidth(iGlyph);
-        if (*pWidth < 0)
-          *pWidth = -1;
-      } else if (pFont->GetCharWidth(wUnicode, pWidth)) {
-        return true;
-      }
-    } else {
-      *pWidth = -1;
+  RetainPtr<CFGAS_GEFont> pFont;
+  int32_t iGlyph;
+  std::tie(iGlyph, pFont) = GetGlyphIndexAndFont(wUnicode, true);
+  if (iGlyph != 0xFFFF && pFont) {
+    if (pFont.Get() == this) {
+      *pWidth = m_pFont->GetGlyphWidth(iGlyph);
+      if (*pWidth < 0)
+        *pWidth = -1;
+    } else if (pFont->GetCharWidth(wUnicode, pWidth)) {
+      return true;
     }
+  } else {
+    *pWidth = -1;
   }
+
   m_CharWidthMap[wUnicode] = *pWidth;
   return *pWidth > 0;
 }
diff --git a/xfa/fgas/font/cfgas_gefont.h b/xfa/fgas/font/cfgas_gefont.h
index ab72f1356f..f4d729d3a5 100644
--- a/xfa/fgas/font/cfgas_gefont.h
+++ b/xfa/fgas/font/cfgas_gefont.h
@@ -49,10 +49,6 @@ class CFGAS_GEFont : public Retainable {
   RetainPtr<CFGAS_GEFont> GetSubstFont(int32_t iGlyphIndex);
   CFX_Font* GetDevFont() const { return m_pFont; }
 
-  void SetFontProvider(CFGAS_PDFFontMgr* pProvider) {
-    m_pProvider.Reset(pProvider);
-  }
-
   void SetLogicalFontStyle(uint32_t dwLogFontStyle) {
     m_bUseLogFontStyle = true;
     m_dwLogFontStyle = dwLogFontStyle;
@@ -82,7 +78,6 @@ class CFGAS_GEFont : public Retainable {
   bool m_bExternalFont;
   RetainPtr<CFGAS_GEFont> m_pSrcFont;  // Only set by ctor, so no cycles.
   CFGAS_FontMgr::ObservedPtr m_pFontMgr;
-  CFGAS_PDFFontMgr::ObservedPtr m_pProvider;
   RetainPtr<IFX_SeekableReadStream> m_pFileRead;
   std::unique_ptr<CFX_UnicodeEncoding> m_pFontEncoding;
   std::map<wchar_t, int32_t> m_CharWidthMap;
diff --git a/xfa/fgas/font/cfgas_pdffontmgr.cpp b/xfa/fgas/font/cfgas_pdffontmgr.cpp
index e2fb905f66..ad28c9eaeb 100644
--- a/xfa/fgas/font/cfgas_pdffontmgr.cpp
+++ b/xfa/fgas/font/cfgas_pdffontmgr.cpp
@@ -183,24 +183,6 @@ bool CFGAS_PDFFontMgr::PsNameMatchDRFontName(const ByteStringView& bsPsName,
   return true;
 }
 
-bool CFGAS_PDFFontMgr::GetCharWidth(const RetainPtr<CFGAS_GEFont>& pFont,
-                                    wchar_t wUnicode,
-                                    int32_t* pWidth) {
-  if (wUnicode != 0x20)
-    return false;
-
-  auto it = m_FDE2PDFFont.find(pFont);
-  if (it == m_FDE2PDFFont.end())
-    return false;
-
-  CPDF_Font* pPDFFont = it->second;
-  // TODO(npm): CFGAS_GEFont::GetCharWidth currently uses -1 as a special value,
-  // so |pWidth| cannot be changed to unsigned until this behavior is changed.
-  *pWidth = static_cast<int32_t>(
-      pPDFFont->GetCharWidthF(pPDFFont->CharCodeFromUnicode(wUnicode)));
-  return true;
-}
-
 void CFGAS_PDFFontMgr::SetFont(const RetainPtr<CFGAS_GEFont>& pFont,
                                CPDF_Font* pPDFFont) {
   m_FDE2PDFFont[pFont] = pPDFFont;
diff --git a/xfa/fgas/font/cfgas_pdffontmgr.h b/xfa/fgas/font/cfgas_pdffontmgr.h
index a019990dad..0cc647500b 100644
--- a/xfa/fgas/font/cfgas_pdffontmgr.h
+++ b/xfa/fgas/font/cfgas_pdffontmgr.h
@@ -30,9 +30,6 @@ class CFGAS_PDFFontMgr : public Observable<CFGAS_PDFFontMgr> {
                                   uint32_t dwFontStyles,
                                   CPDF_Font** pPDFFont,
                                   bool bStrictMatch);
-  bool GetCharWidth(const RetainPtr<CFGAS_GEFont>& pFont,
-                    wchar_t wUnicode,
-                    int32_t* pWidth);
 
  private:
   RetainPtr<CFGAS_GEFont> FindFont(const ByteString& strFamilyName,