Convert CPDF_TextObject to CFX_PointF

This CL converts the OriginX and OriginY from CPDF_TextObjectItem to use a
CFX_PointF instead of two floats.

Change-Id: Id39de18d3d908a86f925bec68d0680392f70906e
Reviewed-on: https://pdfium-review.googlesource.com/2715
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>

1 files changed, 90 insertions, 108 deletions

diff --git a/core/fpdftext/cpdf_textpage.cpp b/core/fpdftext/cpdf_textpage.cpp
index d3dc461992..21a102910d 100644
--- a/core/fpdftext/cpdf_textpage.cpp
+++ b/core/fpdftext/cpdf_textpage.cpp
@@ -55,7 +55,7 @@ FX_FLOAT CalculateBaseSpace(const CPDF_TextObject* pTextObj,
       pTextObj->GetItemInfo(i, &item);
       if (item.m_CharCode == static_cast<uint32_t>(-1)) {
         FX_FLOAT fontsize_h = pTextObj->m_TextState.GetFontSizeH();
-        FX_FLOAT kerning = -fontsize_h * item.m_OriginX / 1000;
+        FX_FLOAT kerning = -fontsize_h * item.m_Origin.x / 1000;
         baseSpace = std::min(baseSpace, kerning + spacing);
         bAllChar = false;
       }
@@ -239,30 +239,33 @@ std::vector<CFX_FloatRect> CPDF_TextPage::GetRectArray(int start,
       bFlagNewRect = true;
     }
     if (bFlagNewRect) {
-      FX_FLOAT orgX = info_curchar.m_OriginX, orgY = info_curchar.m_OriginY;
       CFX_Matrix matrix = info_curchar.m_pTextObj->GetTextMatrix();
       matrix.Concat(info_curchar.m_Matrix);
 
       CFX_Matrix matrix_reverse;
       matrix_reverse.SetReverse(matrix);
-      matrix_reverse.TransformPoint(orgX, orgY);
+
+      CFX_PointF origin =
+          CFX_PointF(info_curchar.m_OriginX, info_curchar.m_OriginY);
+      origin = matrix_reverse.Transform(origin);
+
       rect.left = info_curchar.m_CharBox.left;
       rect.right = info_curchar.m_CharBox.right;
       if (pCurObj->GetFont()->GetTypeDescent()) {
-        rect.bottom = orgY +
+        rect.bottom = origin.y +
                       pCurObj->GetFont()->GetTypeDescent() *
                           pCurObj->GetFontSize() / 1000;
-        FX_FLOAT xPosTemp = orgX;
+        FX_FLOAT xPosTemp = origin.x;
         matrix.TransformPoint(xPosTemp, rect.bottom);
       } else {
         rect.bottom = info_curchar.m_CharBox.bottom;
       }
       if (pCurObj->GetFont()->GetTypeAscent()) {
         rect.top =
-            orgY +
+            origin.y +
             pCurObj->GetFont()->GetTypeAscent() * pCurObj->GetFontSize() / 1000;
         FX_FLOAT xPosTemp =
-            orgX +
+            origin.x +
             GetCharWidth(info_curchar.m_CharCode, pCurObj->GetFont()) *
                 pCurObj->GetFontSize() / 1000;
         matrix.TransformPoint(xPosTemp, rect.top);
@@ -297,7 +300,7 @@ int CPDF_TextPage::GetIndexAtPos(const CFX_PointF& point,
   while (pos < pdfium::CollectionSize<int>(m_CharList)) {
     PAGECHAR_INFO charinfo = m_CharList[pos];
     CFX_FloatRect charrect = charinfo.m_CharBox;
-    if (charrect.Contains(point.x, point.y))
+    if (charrect.Contains(point))
       break;
     if (xTolerance > 0 || yTolerance > 0) {
       CFX_FloatRect charRectExt;
@@ -306,7 +309,7 @@ int CPDF_TextPage::GetIndexAtPos(const CFX_PointF& point,
       charRectExt.right = charrect.right + xTolerance / 2;
       charRectExt.top = charrect.top + yTolerance / 2;
       charRectExt.bottom = charrect.bottom - yTolerance / 2;
-      if (charRectExt.Contains(point.x, point.y)) {
+      if (charRectExt.Contains(point)) {
         double curXdif, curYdif;
         curXdif = FXSYS_fabs(point.x - charrect.left) <
                           FXSYS_fabs(point.x - charrect.right)
@@ -738,10 +741,9 @@ void CPDF_TextPage::ProcessTextObject(
     const CFX_Matrix& formMatrix,
     const CPDF_PageObjectList* pObjList,
     CPDF_PageObjectList::const_iterator ObjPos) {
-  CFX_FloatRect re(pTextObj->m_Left, pTextObj->m_Bottom, pTextObj->m_Right,
-                   pTextObj->m_Top);
   if (FXSYS_fabs(pTextObj->m_Right - pTextObj->m_Left) < 0.01f)
     return;
+
   size_t count = m_LineObj.size();
   PDFTEXT_Obj Obj;
   Obj.m_pTextObj = pTextObj;
@@ -752,6 +754,7 @@ void CPDF_TextPage::ProcessTextObject(
   }
   if (IsSameAsPreTextObject(pTextObj, pObjList, ObjPos))
     return;
+
   PDFTEXT_Obj prev_Obj = m_LineObj[count - 1];
   CPDF_TextObjectItem item;
   int nItem = prev_Obj.m_pTextObj->CountItems();
@@ -776,34 +779,29 @@ void CPDF_TextPage::ProcessTextObject(
 
   FX_FLOAT threshold =
       prev_width > this_width ? prev_width / 4 : this_width / 4;
-  FX_FLOAT prev_x = prev_Obj.m_pTextObj->GetPosX(),
-           prev_y = prev_Obj.m_pTextObj->GetPosY();
-  prev_Obj.m_formMatrix.TransformPoint(prev_x, prev_y);
-  m_DisplayMatrix.TransformPoint(prev_x, prev_y);
-  FX_FLOAT this_x = pTextObj->GetPosX(), this_y = pTextObj->GetPosY();
-  formMatrix.TransformPoint(this_x, this_y);
-  m_DisplayMatrix.TransformPoint(this_x, this_y);
-  if (FXSYS_fabs(this_y - prev_y) > threshold * 2) {
+  CFX_PointF prev_pos = m_DisplayMatrix.Transform(
+      prev_Obj.m_formMatrix.Transform(prev_Obj.m_pTextObj->GetPos()));
+  CFX_PointF this_pos =
+      m_DisplayMatrix.Transform(formMatrix.Transform(pTextObj->GetPos()));
+  if (FXSYS_fabs(this_pos.y - prev_pos.y) > threshold * 2) {
     for (size_t i = 0; i < count; i++)
       ProcessTextObject(m_LineObj[i]);
     m_LineObj.clear();
     m_LineObj.push_back(Obj);
     return;
   }
-  size_t i;
-  for (i = count; i > 0; --i) {
+
+  for (size_t i = count; i > 0; --i) {
     PDFTEXT_Obj prev_text_obj = m_LineObj[i - 1];
-    FX_FLOAT Prev_x = prev_text_obj.m_pTextObj->GetPosX(),
-             Prev_y = prev_text_obj.m_pTextObj->GetPosY();
-    prev_text_obj.m_formMatrix.TransformPoint(Prev_x, Prev_y);
-    m_DisplayMatrix.TransformPoint(Prev_x, Prev_y);
-    if (this_x >= Prev_x) {
+    CFX_PointF new_prev_pos =
+        m_DisplayMatrix.Transform(prev_text_obj.m_formMatrix.Transform(
+            prev_text_obj.m_pTextObj->GetPos()));
+    if (this_pos.x >= new_prev_pos.x) {
       m_LineObj.insert(m_LineObj.begin() + i, Obj);
-      break;
+      return;
     }
   }
-  if (i == 0)
-    m_LineObj.insert(m_LineObj.begin(), Obj);
+  m_LineObj.insert(m_LineObj.begin(), Obj);
 }
 
 FPDFText_MarkedContent CPDF_TextPage::PreMarkedContent(PDFTEXT_Obj Obj) {
@@ -893,14 +891,6 @@ void CPDF_TextPage::ProcessMarkedContent(PDFTEXT_Obj Obj) {
   CFX_Matrix matrix = pTextObj->GetTextMatrix();
   matrix.Concat(Obj.m_formMatrix);
 
-  FX_FLOAT fPosX = pTextObj->GetPosX();
-  FX_FLOAT fPosY = pTextObj->GetPosY();
-  int nCharInfoIndex = m_TextBuf.GetLength();
-  CFX_FloatRect charBox;
-  charBox.top = pTextObj->m_Top;
-  charBox.left = pTextObj->m_Left;
-  charBox.right = pTextObj->m_Right;
-  charBox.bottom = pTextObj->m_Bottom;
   for (FX_STRSIZE k = 0; k < nItems; k++) {
     FX_WCHAR wChar = actText.GetAt(k);
     if (wChar <= 0x80 && !isprint(wChar))
@@ -909,17 +899,14 @@ void CPDF_TextPage::ProcessMarkedContent(PDFTEXT_Obj Obj) {
       continue;
 
     PAGECHAR_INFO charinfo;
-    charinfo.m_OriginX = fPosX;
-    charinfo.m_OriginY = fPosY;
-    charinfo.m_Index = nCharInfoIndex;
+    charinfo.m_OriginX = pTextObj->GetPos().x;
+    charinfo.m_OriginY = pTextObj->GetPos().y;
+    charinfo.m_Index = m_TextBuf.GetLength();
     charinfo.m_Unicode = wChar;
     charinfo.m_CharCode = pFont->CharCodeFromUnicode(wChar);
     charinfo.m_Flag = FPDFTEXT_CHAR_PIECE;
     charinfo.m_pTextObj = pTextObj;
-    charinfo.m_CharBox.top = charBox.top;
-    charinfo.m_CharBox.left = charBox.left;
-    charinfo.m_CharBox.right = charBox.right;
-    charinfo.m_CharBox.bottom = charBox.bottom;
+    charinfo.m_CharBox = pTextObj->GetRect();
     charinfo.m_Matrix = matrix;
     m_TempTextBuf.AppendChar(wChar);
     m_TempCharList.push_back(charinfo);
@@ -989,15 +976,11 @@ void CPDF_TextPage::ProcessTextObject(PDFTEXT_Obj Obj) {
   GenerateCharacter result = GenerateCharacter::None;
   if (m_pPreTextObj) {
     result = ProcessInsertObject(pTextObj, formMatrix);
-    if (result == GenerateCharacter::LineBreak) {
-      m_CurlineRect =
-          CFX_FloatRect(Obj.m_pTextObj->m_Left, Obj.m_pTextObj->m_Bottom,
-                        Obj.m_pTextObj->m_Right, Obj.m_pTextObj->m_Top);
-    } else {
-      m_CurlineRect.Union(
-          CFX_FloatRect(Obj.m_pTextObj->m_Left, Obj.m_pTextObj->m_Bottom,
-                        Obj.m_pTextObj->m_Right, Obj.m_pTextObj->m_Top));
-    }
+    if (result == GenerateCharacter::LineBreak)
+      m_CurlineRect = Obj.m_pTextObj->GetRect();
+    else
+      m_CurlineRect.Union(Obj.m_pTextObj->GetRect());
+
     switch (result) {
       case GenerateCharacter::None:
         break;
@@ -1044,10 +1027,9 @@ void CPDF_TextPage::ProcessTextObject(PDFTEXT_Obj Obj) {
         break;
     }
   } else {
-    m_CurlineRect =
-        CFX_FloatRect(Obj.m_pTextObj->m_Left, Obj.m_pTextObj->m_Bottom,
-                      Obj.m_pTextObj->m_Right, Obj.m_pTextObj->m_Top);
+    m_CurlineRect = Obj.m_pTextObj->GetRect();
   }
+
   if (ePreMKC == FPDFText_MarkedContent::Delay) {
     ProcessMarkedContent(Obj);
     m_pPreTextObj = pTextObj;
@@ -1081,7 +1063,7 @@ void CPDF_TextPage::ProcessTextObject(PDFTEXT_Obj Obj) {
         continue;
 
       FX_FLOAT fontsize_h = pTextObj->m_TextState.GetFontSizeH();
-      spacing = -fontsize_h * item.m_OriginX / 1000;
+      spacing = -fontsize_h * item.m_Origin.x / 1000;
       continue;
     }
     FX_FLOAT charSpace = pTextObj->m_TextState.GetCharSpace();
@@ -1118,8 +1100,8 @@ void CPDF_TextPage::ProcessTextObject(PDFTEXT_Obj Obj) {
         charinfo.m_CharCode = CPDF_Font::kInvalidCharCode;
         charinfo.m_Matrix = formMatrix;
 
-        charinfo.m_OriginX = item.m_OriginX;
-        charinfo.m_OriginY = item.m_OriginY;
+        charinfo.m_OriginX = item.m_Origin.x;
+        charinfo.m_OriginY = item.m_Origin.y;
         matrix.TransformPoint(charinfo.m_OriginX, charinfo.m_OriginY);
         charinfo.m_CharBox =
             CFX_FloatRect(charinfo.m_OriginX, charinfo.m_OriginY,
@@ -1144,20 +1126,20 @@ void CPDF_TextPage::ProcessTextObject(PDFTEXT_Obj Obj) {
       charinfo.m_Flag = FPDFTEXT_CHAR_NORMAL;
 
     charinfo.m_pTextObj = pTextObj;
-    charinfo.m_OriginX = item.m_OriginX;
-    charinfo.m_OriginY = item.m_OriginY;
+    charinfo.m_OriginX = item.m_Origin.x;
+    charinfo.m_OriginY = item.m_Origin.y;
     matrix.TransformPoint(charinfo.m_OriginX, charinfo.m_OriginY);
 
     FX_RECT rect =
         charinfo.m_pTextObj->GetFont()->GetCharBBox(charinfo.m_CharCode);
     charinfo.m_CharBox.top =
-        rect.top * pTextObj->GetFontSize() / 1000 + item.m_OriginY;
+        rect.top * pTextObj->GetFontSize() / 1000 + item.m_Origin.y;
     charinfo.m_CharBox.left =
-        rect.left * pTextObj->GetFontSize() / 1000 + item.m_OriginX;
+        rect.left * pTextObj->GetFontSize() / 1000 + item.m_Origin.x;
     charinfo.m_CharBox.right =
-        rect.right * pTextObj->GetFontSize() / 1000 + item.m_OriginX;
+        rect.right * pTextObj->GetFontSize() / 1000 + item.m_Origin.x;
     charinfo.m_CharBox.bottom =
-        rect.bottom * pTextObj->GetFontSize() / 1000 + item.m_OriginY;
+        rect.bottom * pTextObj->GetFontSize() / 1000 + item.m_Origin.y;
     if (fabsf(charinfo.m_CharBox.top - charinfo.m_CharBox.bottom) < 0.01f) {
       charinfo.m_CharBox.top =
           charinfo.m_CharBox.bottom + pTextObj->GetFontSize();
@@ -1227,10 +1209,11 @@ CPDF_TextPage::TextOrientation CPDF_TextPage::GetTextObjectWritingMode(
   pTextObj->GetCharInfo(nChars - 1, &last);
 
   CFX_Matrix textMatrix = pTextObj->GetTextMatrix();
-  textMatrix.TransformPoint(first.m_OriginX, first.m_OriginY);
-  textMatrix.TransformPoint(last.m_OriginX, last.m_OriginY);
-  FX_FLOAT dX = FXSYS_fabs(last.m_OriginX - first.m_OriginX);
-  FX_FLOAT dY = FXSYS_fabs(last.m_OriginY - first.m_OriginY);
+  first.m_Origin = textMatrix.Transform(first.m_Origin);
+  last.m_Origin = textMatrix.Transform(last.m_Origin);
+
+  FX_FLOAT dX = FXSYS_fabs(last.m_Origin.x - first.m_Origin.x);
+  FX_FLOAT dY = FXSYS_fabs(last.m_Origin.y - first.m_Origin.y);
   if (dX <= 0.0001f && dY <= 0.0001f)
     return TextOrientation::Unknown;
 
@@ -1287,11 +1270,10 @@ CPDF_TextPage::GenerateCharacter CPDF_TextPage::ProcessInsertObject(
   if (WritingMode == TextOrientation::Unknown)
     WritingMode = GetTextObjectWritingMode(m_pPreTextObj);
 
-  CFX_FloatRect this_rect(pObj->m_Left, pObj->m_Bottom, pObj->m_Right,
-                          pObj->m_Top);
-  CFX_FloatRect prev_rect(m_pPreTextObj->m_Left, m_pPreTextObj->m_Bottom,
-                          m_pPreTextObj->m_Right, m_pPreTextObj->m_Top);
-  CPDF_TextObjectItem PrevItem, item;
+  CFX_FloatRect this_rect = pObj->GetRect();
+  CFX_FloatRect prev_rect = m_pPreTextObj->GetRect();
+  CPDF_TextObjectItem PrevItem;
+  CPDF_TextObjectItem item;
   int nItem = m_pPreTextObj->CountItems();
   m_pPreTextObj->GetItemInfo(nItem - 1, &PrevItem);
   pObj->GetItemInfo(0, &item);
@@ -1325,7 +1307,8 @@ CPDF_TextPage::GenerateCharacter CPDF_TextPage::ProcessInsertObject(
       }
     }
   }
-  FX_FLOAT last_pos = PrevItem.m_OriginX;
+
+  FX_FLOAT last_pos = PrevItem.m_Origin.x;
   int nLastWidth = GetCharWidth(PrevItem.m_CharCode, m_pPreTextObj->GetFont());
   FX_FLOAT last_width = nLastWidth * m_pPreTextObj->GetFontSize() / 1000;
   last_width = FXSYS_fabs(last_width);
@@ -1340,42 +1323,39 @@ CPDF_TextPage::GenerateCharacter CPDF_TextPage::ProcessInsertObject(
 
   CFX_Matrix prev_reverse;
   prev_reverse.SetReverse(prev_matrix);
-  FX_FLOAT x = pObj->GetPosX();
-  FX_FLOAT y = pObj->GetPosY();
-  formMatrix.TransformPoint(x, y);
-  prev_reverse.TransformPoint(x, y);
+
+  CFX_PointF pos = prev_reverse.Transform(formMatrix.Transform(pObj->GetPos()));
   if (last_width < this_width)
     threshold = prev_reverse.TransformDistance(threshold);
+
   bool bNewline = false;
   if (WritingMode == TextOrientation::Horizontal) {
     CFX_FloatRect rect1(m_pPreTextObj->m_Left, pObj->m_Bottom,
                         m_pPreTextObj->m_Right, pObj->m_Top);
-    CFX_FloatRect rect2(m_pPreTextObj->m_Left, m_pPreTextObj->m_Bottom,
-                        m_pPreTextObj->m_Right, m_pPreTextObj->m_Top);
+    CFX_FloatRect rect2 = m_pPreTextObj->GetRect();
     CFX_FloatRect rect3 = rect1;
     rect1.Intersect(rect2);
     if ((rect1.IsEmpty() && rect2.Height() > 5 && rect3.Height() > 5) ||
-        ((y > threshold * 2 || y < threshold * -3) &&
-         (FXSYS_fabs(y) < 1 ? FXSYS_fabs(x) < FXSYS_fabs(y) : true))) {
+        ((pos.y > threshold * 2 || pos.y < threshold * -3) &&
+         (FXSYS_fabs(pos.y) < 1 ? FXSYS_fabs(pos.x) < FXSYS_fabs(pos.y)
+                                : true))) {
       bNewline = true;
       if (nItem > 1) {
         CPDF_TextObjectItem tempItem;
         m_pPreTextObj->GetItemInfo(0, &tempItem);
         CFX_Matrix m = m_pPreTextObj->GetTextMatrix();
-        if (PrevItem.m_OriginX > tempItem.m_OriginX &&
+        if (PrevItem.m_Origin.x > tempItem.m_Origin.x &&
             m_DisplayMatrix.a > 0.9 && m_DisplayMatrix.b < 0.1 &&
             m_DisplayMatrix.c < 0.1 && m_DisplayMatrix.d < -0.9 && m.b < 0.1 &&
             m.c < 0.1) {
           CFX_FloatRect re(0, m_pPreTextObj->m_Bottom, 1000,
                            m_pPreTextObj->m_Top);
-          if (re.Contains(pObj->GetPosX(), pObj->GetPosY())) {
+          if (re.Contains(pObj->GetPos())) {
             bNewline = false;
           } else {
             CFX_FloatRect rect(0, pObj->m_Bottom, 1000, pObj->m_Top);
-            if (rect.Contains(m_pPreTextObj->GetPosX(),
-                              m_pPreTextObj->GetPosY())) {
+            if (rect.Contains(m_pPreTextObj->GetPos()))
               bNewline = false;
-            }
           }
         }
       }
@@ -1415,17 +1395,17 @@ CPDF_TextPage::GenerateCharacter CPDF_TextPage::ProcessInsertObject(
       (threshold < 1.39001 && threshold > 1.38999)) {
     threshold *= 1.5;
   }
-  if (FXSYS_fabs(last_pos + last_width - x) > threshold && curChar != L' ' &&
-      preChar != L' ') {
+  if (FXSYS_fabs(last_pos + last_width - pos.x) > threshold &&
+      curChar != L' ' && preChar != L' ') {
     if (curChar != L' ' && preChar != L' ') {
-      if ((x - last_pos - last_width) > threshold ||
-          (last_pos - x - last_width) > threshold) {
+      if ((pos.x - last_pos - last_width) > threshold ||
+          (last_pos - pos.x - last_width) > threshold) {
         return GenerateCharacter::Space;
       }
-      if (x < 0 && (last_pos - x - last_width) > threshold)
+      if (pos.x < 0 && (last_pos - pos.x - last_width) > threshold)
         return GenerateCharacter::Space;
-      if ((x - last_pos - last_width) > this_width ||
-          (x - last_pos - this_width) > last_width) {
+      if ((pos.x - last_pos - last_width) > this_width ||
+          (pos.x - last_pos - this_width) > last_width) {
         return GenerateCharacter::Space;
       }
     }
@@ -1437,10 +1417,9 @@ bool CPDF_TextPage::IsSameTextObject(CPDF_TextObject* pTextObj1,
                                      CPDF_TextObject* pTextObj2) {
   if (!pTextObj1 || !pTextObj2)
     return false;
-  CFX_FloatRect rcPreObj(pTextObj2->m_Left, pTextObj2->m_Bottom,
-                         pTextObj2->m_Right, pTextObj2->m_Top);
-  CFX_FloatRect rcCurObj(pTextObj1->m_Left, pTextObj1->m_Bottom,
-                         pTextObj1->m_Right, pTextObj1->m_Top);
+
+  CFX_FloatRect rcPreObj = pTextObj2->GetRect();
+  CFX_FloatRect rcCurObj = pTextObj1->GetRect();
   if (rcPreObj.IsEmpty() && rcCurObj.IsEmpty()) {
     FX_FLOAT dbXdif = FXSYS_fabs(rcPreObj.left - rcCurObj.left);
     size_t nCount = m_CharList.size();
@@ -1470,21 +1449,22 @@ bool CPDF_TextPage::IsSameTextObject(CPDF_TextObject* pTextObj1,
   if (!nPreCount)
     return true;
 
-  CPDF_TextObjectItem itemPer = {0, 0.0f, 0.0f};
-  CPDF_TextObjectItem itemCur = {0, 0.0f, 0.0f};
+  CPDF_TextObjectItem itemPer;
+  CPDF_TextObjectItem itemCur;
   for (int i = 0; i < nPreCount; i++) {
     pTextObj2->GetItemInfo(i, &itemPer);
     pTextObj1->GetItemInfo(i, &itemCur);
     if (itemCur.m_CharCode != itemPer.m_CharCode)
       return false;
   }
-  if (FXSYS_fabs(pTextObj1->GetPosX() - pTextObj2->GetPosX()) >
-          GetCharWidth(itemPer.m_CharCode, pTextObj2->GetFont()) *
-              pTextObj2->GetFontSize() / 1000 * 0.9 ||
-      FXSYS_fabs(pTextObj1->GetPosY() - pTextObj2->GetPosY()) >
-          std::max(std::max(rcPreObj.Height(), rcPreObj.Width()),
-                   pTextObj2->GetFontSize()) /
-              8) {
+
+  CFX_PointF diff = pTextObj1->GetPos() - pTextObj2->GetPos();
+  FX_FLOAT font_size = pTextObj2->GetFontSize();
+  FX_FLOAT char_size = GetCharWidth(itemPer.m_CharCode, pTextObj2->GetFont());
+  FX_FLOAT max_pre_size =
+      std::max(std::max(rcPreObj.Height(), rcPreObj.Width()), font_size);
+  if (FXSYS_fabs(diff.x) > char_size * font_size / 1000 * 0.9 ||
+      FXSYS_fabs(diff.y) > max_pre_size / 8) {
     return false;
   }
   return true;
@@ -1515,11 +1495,13 @@ bool CPDF_TextPage::GenerateCharInfo(FX_WCHAR unicode, PAGECHAR_INFO& info) {
     preChar = &m_CharList.back();
   else
     return false;
+
   info.m_Index = m_TextBuf.GetLength();
   info.m_Unicode = unicode;
   info.m_pTextObj = nullptr;
   info.m_CharCode = CPDF_Font::kInvalidCharCode;
   info.m_Flag = FPDFTEXT_CHAR_GENERATED;
+
   int preWidth = 0;
   if (preChar->m_pTextObj && preChar->m_CharCode != -1) {
     preWidth =