Reduce signed/unsigned comparison warnings

fpdfsdk/fsdk_baseform.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fpdfsdk/include/fsdk_baseform.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 2782 matching lines @@
             fTop = rcAnnot.top;
           }
         }
         if (nLeftTopIndex >= 0) {
           CPDFSDK_Annot* pLeftTopAnnot = sa[nLeftTopIndex];
           CFX_FloatRect rcLeftTop = GetAnnotRect(pLeftTopAnnot);
           m_Annots.push_back(pLeftTopAnnot);
           sa.erase(sa.begin() + nLeftTopIndex);
 
           std::vector<int> aSelect;
-          for (int i = 0; i < sa.size(); ++i) {
+          for (size_t i = 0; i < sa.size(); ++i) {
             CFX_FloatRect rcAnnot = GetAnnotRect(sa[i]);
             FX_FLOAT fCenterY = (rcAnnot.top + rcAnnot.bottom) / 2.0f;
             if (fCenterY > rcLeftTop.bottom && fCenterY < rcLeftTop.top)
               aSelect.push_back(i);
           }
-          for (int i = 0; i < aSelect.size(); ++i)
+          for (size_t i = 0; i < aSelect.size(); ++i)
             m_Annots.push_back(sa[aSelect[i]]);
 
           for (int i = aSelect.size() - 1; i >= 0; --i)
             sa.erase(sa.begin() + aSelect[i]);
         }
       }
     } break;
     case COLUMN: {
       std::vector<CPDFSDK_Annot*> sa;
       for (size_t i = 0; i < m_pPageView->CountAnnots(); ++i) {
@@ skipping 17 matching lines @@
           }
         }
 
         if (nLeftTopIndex >= 0) {
           CPDFSDK_Annot* pLeftTopAnnot = sa[nLeftTopIndex];
           CFX_FloatRect rcLeftTop = GetAnnotRect(pLeftTopAnnot);
           m_Annots.push_back(pLeftTopAnnot);
           sa.erase(sa.begin() + nLeftTopIndex);
 
           std::vector<int> aSelect;
-          for (int i = 0; i < sa.size(); ++i) {
+          for (size_t i = 0; i < sa.size(); ++i) {
             CFX_FloatRect rcAnnot = GetAnnotRect(sa[i]);
             FX_FLOAT fCenterX = (rcAnnot.left + rcAnnot.right) / 2.0f;
             if (fCenterX > rcLeftTop.left && fCenterX < rcLeftTop.right)
               aSelect.push_back(i);
           }
-          for (int i = 0; i < aSelect.size(); ++i)
+          for (size_t i = 0; i < aSelect.size(); ++i)
             m_Annots.push_back(sa[aSelect[i]]);
 
           for (int i = aSelect.size() - 1; i >= 0; --i)
             sa.erase(sa.begin() + aSelect[i]);
         }
       }
       break;
     }
   }
 }
 
 CFX_FloatRect CBA_AnnotIterator::GetAnnotRect(const CPDFSDK_Annot* pAnnot) {
   CFX_FloatRect rcAnnot;
   pAnnot->GetPDFAnnot()->GetRect(rcAnnot);
   return rcAnnot;
 }