Move fxcrt::{Byte,Wide}Strings with std::move().chromium/3466

Remove some string copies in barcode that were noticed whilst
looking for moves.

Change-Id: Ieda34d00f633576ba1f0dca283dcdabfb36f236c
Reviewed-on: https://pdfium-review.googlesource.com/35410
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

9 files changed, 28 insertions, 26 deletions

diff --git a/core/fpdfapi/font/cpdf_tounicodemap.cpp b/core/fpdfapi/font/cpdf_tounicodemap.cpp
index 7b5936c31e..e8917310a2 100644
--- a/core/fpdfapi/font/cpdf_tounicodemap.cpp
+++ b/core/fpdfapi/font/cpdf_tounicodemap.cpp
@@ -6,6 +6,8 @@
 
 #include "core/fpdfapi/font/cpdf_tounicodemap.h"
 
+#include <utility>
+
 #include "core/fpdfapi/cpdf_modulemgr.h"
 #include "core/fpdfapi/font/cpdf_cid2unicodemap.h"
 #include "core/fpdfapi/page/cpdf_pagemodule.h"
@@ -205,7 +207,7 @@ void CPDF_ToUnicodeMap::Load(const CPDF_Stream* pStream) {
               m_Map[code] = GetUnicode();
               m_MultiCharBuf.AppendChar(retcode.GetLength());
               m_MultiCharBuf << retcode;
-              destcode = retcode;
+              destcode = std::move(retcode);
             }
           }
         }
diff --git a/core/fpdfapi/page/cpdf_contentmark.cpp b/core/fpdfapi/page/cpdf_contentmark.cpp
index e17a30560f..deddf3cc3e 100644
--- a/core/fpdfapi/page/cpdf_contentmark.cpp
+++ b/core/fpdfapi/page/cpdf_contentmark.cpp
@@ -31,10 +31,10 @@ int CPDF_ContentMark::GetMarkedContentID() const {
   return pData ? pData->GetMarkedContentID() : -1;
 }
 
-void CPDF_ContentMark::AddMark(const ByteString& name,
+void CPDF_ContentMark::AddMark(ByteString name,
                                const CPDF_Dictionary* pDict,
                                bool bDirect) {
-  m_Ref.GetPrivateCopy()->AddMark(name, pDict, bDirect);
+  m_Ref.GetPrivateCopy()->AddMark(std::move(name), pDict, bDirect);
 }
 
 void CPDF_ContentMark::DeleteLastMark() {
@@ -68,11 +68,11 @@ int CPDF_ContentMark::MarkData::GetMarkedContentID() const {
   return -1;
 }
 
-void CPDF_ContentMark::MarkData::AddMark(const ByteString& name,
+void CPDF_ContentMark::MarkData::AddMark(ByteString name,
                                          const CPDF_Dictionary* pDict,
                                          bool bDirect) {
   CPDF_ContentMarkItem item;
-  item.SetName(name);
+  item.SetName(std::move(name));
   if (pDict) {
     if (bDirect)
       item.SetDirectDict(ToDictionary(pDict->Clone()));
diff --git a/core/fpdfapi/page/cpdf_contentmark.h b/core/fpdfapi/page/cpdf_contentmark.h
index 1d8b9e2515..494c20630b 100644
--- a/core/fpdfapi/page/cpdf_contentmark.h
+++ b/core/fpdfapi/page/cpdf_contentmark.h
@@ -25,9 +25,7 @@ class CPDF_ContentMark {
   size_t CountItems() const;
   const CPDF_ContentMarkItem& GetItem(size_t i) const;
 
-  void AddMark(const ByteString& name,
-               const CPDF_Dictionary* pDict,
-               bool bDirect);
+  void AddMark(ByteString name, const CPDF_Dictionary* pDict, bool bDirect);
   void DeleteLastMark();
 
   bool HasRef() const { return !!m_Ref; }
@@ -43,7 +41,7 @@ class CPDF_ContentMark {
     const CPDF_ContentMarkItem& GetItem(size_t index) const;
 
     int GetMarkedContentID() const;
-    void AddMark(const ByteString& name,
+    void AddMark(ByteString name,
                  const CPDF_Dictionary* pDict,
                  bool bDictNeedClone);
     void DeleteLastMark();
diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.cpp b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
index 0cc81f1e9b..2fbb73b6b2 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
@@ -184,7 +184,7 @@ void ReplaceAbbr(CPDF_Object* pObj) {
         if (!fullname.IsEmpty()) {
           AbbrReplacementOp op;
           op.is_replace_key = true;
-          op.key = key;
+          op.key = std::move(key);
           op.replacement = fullname;
           replacements.push_back(op);
           key = fullname;
@@ -606,9 +606,8 @@ void CPDF_StreamContentParser::Handle_BeginMarkedContent_Dictionary() {
       return;
     bDirect = false;
   }
-  if (const CPDF_Dictionary* pDict = pProperty->AsDictionary()) {
-    m_CurContentMark.AddMark(tag, pDict, bDirect);
-  }
+  if (const CPDF_Dictionary* pDict = pProperty->AsDictionary())
+    m_CurContentMark.AddMark(std::move(tag), pDict, bDirect);
 }
 
 void CPDF_StreamContentParser::Handle_BeginImage() {
@@ -755,20 +754,23 @@ void CPDF_StreamContentParser::Handle_ExecuteXObject() {
   if (pXObject->GetDict())
     type = pXObject->GetDict()->GetStringFor("Subtype");
 
+  if (type == "Form") {
+    AddForm(pXObject);
+    return;
+  }
+
   if (type == "Image") {
     CPDF_ImageObject* pObj = pXObject->IsInline()
                                  ? AddImage(std::unique_ptr<CPDF_Stream>(
                                        ToStream(pXObject->Clone())))
                                  : AddImage(pXObject->GetObjNum());
 
-    m_LastImageName = name;
+    m_LastImageName = std::move(name);
     if (pObj) {
       m_pLastImage = pObj->GetImage();
       if (m_pLastImage->IsMask())
         m_pObjectHolder->AddImageMaskBoundingBox(pObj->GetRect());
     }
-  } else if (type == "Form") {
-    AddForm(pXObject);
   }
 }
 
@@ -1307,7 +1309,7 @@ void CPDF_StreamContentParser::Handle_ShowText_Positioning() {
       ByteString str = pObj->GetString();
       if (str.IsEmpty())
         continue;
-      strs[iSegment] = str;
+      strs[iSegment] = std::move(str);
       kernings[iSegment++] = 0;
     } else {
       float num = pObj->GetNumber();
diff --git a/core/fpdfapi/parser/fpdf_parser_decode.cpp b/core/fpdfapi/parser/fpdf_parser_decode.cpp
index aafb812234..0ca9b4eab2 100644
--- a/core/fpdfapi/parser/fpdf_parser_decode.cpp
+++ b/core/fpdfapi/parser/fpdf_parser_decode.cpp
@@ -404,7 +404,7 @@ bool PDF_DataDecode(const uint8_t* src_buf,
         decoder = "DCTDecode";
       else if (decoder == "CCF")
         decoder = "CCITTFaxDecode";
-      *ImageEncoding = decoder;
+      *ImageEncoding = std::move(decoder);
       *pImageParms = pParam;
       *dest_buf = last_buf;
       *dest_size = last_size;
diff --git a/core/fpdfdoc/cpdf_formcontrol.cpp b/core/fpdfdoc/cpdf_formcontrol.cpp
index 2100d4ecee..a80b0294c1 100644
--- a/core/fpdfdoc/cpdf_formcontrol.cpp
+++ b/core/fpdfdoc/cpdf_formcontrol.cpp
@@ -149,11 +149,10 @@ bool CPDF_FormControl::IsDefaultChecked() const {
 void CPDF_FormControl::CheckControl(bool bChecked) {
   ASSERT(GetType() == CPDF_FormField::CheckBox ||
          GetType() == CPDF_FormField::RadioButton);
-  ByteString csOn = GetOnStateName();
   ByteString csOldAS = m_pWidgetDict->GetStringFor("AS", "Off");
   ByteString csAS = "Off";
   if (bChecked)
-    csAS = csOn;
+    csAS = GetOnStateName();
   if (csOldAS == csAS)
     return;
   m_pWidgetDict->SetNewFor<CPDF_Name>("AS", csAS);
diff --git a/core/fpdfdoc/cpdf_formfield.cpp b/core/fpdfdoc/cpdf_formfield.cpp
index 8dcc9e68b6..2f05ad8732 100644
--- a/core/fpdfdoc/cpdf_formfield.cpp
+++ b/core/fpdfdoc/cpdf_formfield.cpp
@@ -92,7 +92,7 @@ WideString FPDF_GetFullName(CPDF_Dictionary* pFieldDict) {
     WideString short_name = pLevel->GetUnicodeTextFor("T");
     if (!short_name.IsEmpty()) {
       if (full_name.IsEmpty())
-        full_name = short_name;
+        full_name = std::move(short_name);
       else
         full_name = short_name + L"." + full_name;
     }
diff --git a/core/fpdfdoc/cpdf_interform.cpp b/core/fpdfdoc/cpdf_interform.cpp
index de3770901b..b18310cfde 100644
--- a/core/fpdfdoc/cpdf_interform.cpp
+++ b/core/fpdfdoc/cpdf_interform.cpp
@@ -206,8 +206,7 @@ bool FindFont(CPDF_Dictionary* pFormDict,
     if (!pFont)
       continue;
 
-    ByteString csBaseFont;
-    csBaseFont = pFont->GetBaseFont();
+    ByteString csBaseFont = pFont->GetBaseFont();
     csBaseFont.Remove(' ');
     if (csBaseFont == csFontName) {
       *csNameTag = csKey;
@@ -228,7 +227,7 @@ void AddFont(CPDF_Dictionary*& pFormDict,
 
   ByteString csTag;
   if (FindFont(pFormDict, pFont, &csTag)) {
-    *csNameTag = csTag;
+    *csNameTag = std::move(csTag);
     return;
   }
   if (!pFormDict)
@@ -261,7 +260,7 @@ CPDF_Font* AddNativeFont(CPDF_Dictionary*& pFormDict,
   ByteString csTemp;
   CPDF_Font* pFont = GetNativeFont(pFormDict, pDocument, charSet, &csTemp);
   if (pFont) {
-    *csNameTag = csTemp;
+    *csNameTag = std::move(csTemp);
     return pFont;
   }
   ByteString csFontName = CPDF_InterForm::GetNativeFont(charSet, nullptr);
diff --git a/core/fpdfdoc/cpdf_structelement.cpp b/core/fpdfdoc/cpdf_structelement.cpp
index 24c028fb61..d8fc0d88ba 100644
--- a/core/fpdfdoc/cpdf_structelement.cpp
+++ b/core/fpdfdoc/cpdf_structelement.cpp
@@ -6,6 +6,8 @@
 
 #include "core/fpdfdoc/cpdf_structelement.h"
 
+#include <utility>
+
 #include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfapi/parser/cpdf_name.h"
@@ -36,7 +38,7 @@ CPDF_StructElement::CPDF_StructElement(CPDF_StructTree* pTree,
   if (pTree->GetRoleMap()) {
     ByteString mapped = pTree->GetRoleMap()->GetStringFor(m_Type);
     if (!mapped.IsEmpty())
-      m_Type = mapped;
+      m_Type = std::move(mapped);
   }
   LoadKids(pDict);
 }