diff --git a/core/fpdfapi/page/cpdf_textobject.cpp b/core/fpdfapi/page/cpdf_textobject.cpp
index 914de72..33e1b0b 100644
--- a/core/fpdfapi/page/cpdf_textobject.cpp
+++ b/core/fpdfapi/page/cpdf_textobject.cpp
@@ -189,7 +189,7 @@
   pTextMatrix[2] = matrix.b;
   pTextMatrix[3] = matrix.d;
   m_Pos = CFX_PointF(matrix.e, matrix.f);
-  CalcPositionData(0);
+  CalcPositionDataInternal(GetFont());
 }
 
 void CPDF_TextObject::SetSegments(const ByteString* pStrs,
@@ -223,7 +223,7 @@
 
 void CPDF_TextObject::SetText(const ByteString& str) {
   SetSegments(&str, std::vector<float>(), 1);
-  CalcPositionData(/*horz_scale=*/1.0f);
+  CalcPositionDataInternal(GetFont());
   SetDirty(true);
 }
 
@@ -256,12 +256,20 @@
 }
 
 CFX_PointF CPDF_TextObject::CalcPositionData(float horz_scale) {
+  RetainPtr<CPDF_Font> pFont = GetFont();
+  const float curpos = CalcPositionDataInternal(pFont);
+  if (IsVertWritingCIDFont(pFont->AsCIDFont()))
+    return {0, curpos};
+  return {curpos * horz_scale, 0};
+}
+
+float CPDF_TextObject::CalcPositionDataInternal(
+    const RetainPtr<CPDF_Font>& pFont) {
   float curpos = 0;
   float min_x = 10000.0f;
   float max_x = -10000.0f;
   float min_y = 10000.0f;
   float max_y = -10000.0f;
-  RetainPtr<CPDF_Font> pFont = GetFont();
   const CPDF_CIDFont* pCIDFont = pFont->AsCIDFont();
   const bool bVertWriting = IsVertWritingCIDFont(pCIDFont);
   const float fontsize = GetFontSize();
@@ -309,13 +317,10 @@
     curpos += m_TextState.GetCharSpace();
   }
 
-  CFX_PointF ret;
   if (bVertWriting) {
-    ret.y = curpos;
     min_x = min_x * fontsize / 1000;
     max_x = max_x * fontsize / 1000;
   } else {
-    ret.x = curpos * horz_scale;
     min_y = min_y * fontsize / 1000;
     max_y = max_y * fontsize / 1000;
   }
@@ -328,5 +333,5 @@
   }
   SetRect(rect);
 
-  return ret;
+  return curpos;
 }
diff --git a/core/fpdfapi/page/cpdf_textobject.h b/core/fpdfapi/page/cpdf_textobject.h
index 67a42ca..d52aad7 100644
--- a/core/fpdfapi/page/cpdf_textobject.h
+++ b/core/fpdfapi/page/cpdf_textobject.h
@@ -75,6 +75,8 @@
   CFX_PointF CalcPositionData(float horz_scale);
 
  private:
+  float CalcPositionDataInternal(const RetainPtr<CPDF_Font>& pFont);
+
   CFX_PointF m_Pos;
   std::vector<uint32_t> m_CharCodes;
   std::vector<float> m_CharPos;