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-rw-r--r--fpdfsdk/fpdf_ppo.cpp129
1 files changed, 79 insertions, 50 deletions
diff --git a/fpdfsdk/fpdf_ppo.cpp b/fpdfsdk/fpdf_ppo.cpp
index b5e128f150..fb3dd8a19f 100644
--- a/fpdfsdk/fpdf_ppo.cpp
+++ b/fpdfsdk/fpdf_ppo.cpp
@@ -300,29 +300,42 @@ class CPDF_PageOrganizer {
unsigned int numPagesOnYAxis);
private:
+ // Map source page object number to XObject object number.
using ObjectNumberMap = std::map<uint32_t, uint32_t>;
+ // Map page object number to XObject object name.
+ using PageXObjectMap = std::map<uint32_t, ByteString>;
+ // Map XObject's object name to it's object number.
+ using XObjectNameNumberMap = std::map<ByteString, uint32_t>;
static void SetMediaBox(CPDF_Dictionary* pDestPageDict,
const CFX_SizeF& pagesize);
bool UpdateReference(CPDF_Object* pObj, ObjectNumberMap* pObjNumberMap);
uint32_t GetNewObjId(ObjectNumberMap* pObjNumberMap, CPDF_Reference* pRef);
- // Creates a xobject from the source page dictionary, and appends the content
- // string with the xobject reference surrounded by the transformation matrix.
+ // Creates a xobject from the source page dictionary, and appends the
+ // bsContent string with the xobject reference surrounded by the
+ // transformation matrix.
void AddSubPage(CPDF_Dictionary* pPageDict,
const CFX_PointF& position,
float scale,
- ByteString* content);
- CPDF_Object* MakeXObject(CPDF_Dictionary* pSrcPageDict,
- CPDF_Document* pDestDoc);
- void FinishPage(CPDF_Dictionary* pCurPageDict, const ByteString& content);
+ ObjectNumberMap* pObjNumberMap,
+ PageXObjectMap* pPageXObjectMap,
+ XObjectNameNumberMap* pXObjNameNumberMap,
+ ByteString* bsContent);
+ uint32_t MakeXObject(CPDF_Dictionary* pSrcPageDict,
+ ObjectNumberMap* pObjNumberMap,
+ CPDF_Document* pDestDoc);
+ void FinishPage(CPDF_Dictionary* pCurPageDict,
+ const ByteString& bsContent,
+ XObjectNameNumberMap* pXObjNameNumberMap);
UnownedPtr<CPDF_Document> m_pDestPDFDoc;
UnownedPtr<CPDF_Document> m_pSrcPDFDoc;
uint32_t m_xobjectNum = 0;
CFX_SizeF m_pageSize;
- // Key is XObject name
- std::map<ByteString, UnownedPtr<CPDF_Object>> m_xobjs;
+ // Mapping of XObject name and XObject object number of the entire document.
+ // Key is XObject name.
+ XObjectNameNumberMap m_xobjs;
};
CPDF_PageOrganizer::CPDF_PageOrganizer(CPDF_Document* pDestPDFDoc,
@@ -375,11 +388,24 @@ bool CPDF_PageOrganizer::PDFDocInit() {
void CPDF_PageOrganizer::AddSubPage(CPDF_Dictionary* pPageDict,
const CFX_PointF& position,
float scale,
- ByteString* content) {
- ++m_xobjectNum;
- // TODO(Xlou): A better name schema to avoid possible object name collision.
- ByteString xobjectName = ByteString::Format("X%d", m_xobjectNum);
- m_xobjs[xobjectName] = MakeXObject(pPageDict, m_pDestPDFDoc.Get());
+ ObjectNumberMap* pObjNumberMap,
+ PageXObjectMap* pPageXObjectMap,
+ XObjectNameNumberMap* pXObjNameNumberMap,
+ ByteString* bsContent) {
+ uint32_t dwPageObjnum = pPageDict->GetObjNum();
+ ByteString bsXObjectName;
+ const auto it = pPageXObjectMap->find(dwPageObjnum);
+ if (it != pPageXObjectMap->end()) {
+ bsXObjectName = it->second;
+ } else {
+ ++m_xobjectNum;
+ // TODO(Xlou): A better name schema to avoid possible object name collision.
+ bsXObjectName = ByteString::Format("X%d", m_xobjectNum);
+ m_xobjs[bsXObjectName] =
+ MakeXObject(pPageDict, pObjNumberMap, m_pDestPDFDoc.Get());
+ (*pPageXObjectMap)[dwPageObjnum] = bsXObjectName;
+ }
+ (*pXObjNameNumberMap)[bsXObjectName] = m_xobjs[bsXObjectName];
CFX_Matrix matrix;
matrix.Scale(scale, scale);
@@ -389,35 +415,29 @@ void CPDF_PageOrganizer::AddSubPage(CPDF_Dictionary* pPageDict,
contentStream << "q\n"
<< matrix.a << " " << matrix.b << " " << matrix.c << " "
<< matrix.d << " " << matrix.e << " " << matrix.f << " cm\n"
- << "/" << xobjectName << " Do Q\n";
- *content += ByteString(contentStream);
+ << "/" << bsXObjectName << " Do Q\n";
+ *bsContent += ByteString(contentStream);
}
-CPDF_Object* CPDF_PageOrganizer::MakeXObject(CPDF_Dictionary* pSrcPageDict,
- CPDF_Document* pDestDoc) {
+uint32_t CPDF_PageOrganizer::MakeXObject(CPDF_Dictionary* pSrcPageDict,
+ ObjectNumberMap* pObjNumberMap,
+ CPDF_Document* pDestDoc) {
ASSERT(pSrcPageDict);
- auto pObjNumberMap = pdfium::MakeUnique<ObjectNumberMap>();
-
CPDF_Object* pSrcContentObj = GetPageOrganizerPageContent(pSrcPageDict);
CPDF_Stream* pNewXObject = pDestDoc->NewIndirect<CPDF_Stream>(
nullptr, 0,
pdfium::MakeUnique<CPDF_Dictionary>(pDestDoc->GetByteStringPool()));
CPDF_Dictionary* pNewXObjectDict = pNewXObject->GetDict();
- const ByteString resourceString = "Resources";
- if (!CopyInheritable(pNewXObjectDict, pSrcPageDict, resourceString)) {
+ const ByteString bsResourceString = "Resources";
+ if (!CopyInheritable(pNewXObjectDict, pSrcPageDict, bsResourceString)) {
// Use a default empty resources if it does not exist.
- pNewXObjectDict->SetNewFor<CPDF_Dictionary>(resourceString);
- }
- CPDF_Dictionary* pSrcRes = pSrcPageDict->GetDictFor(resourceString);
- if (pSrcRes) {
- uint32_t dwSrcPageResourcesObj = pSrcRes->GetObjNum();
- uint32_t dwNewXobjectResourcesObj =
- pNewXObjectDict->GetDictFor(resourceString)->GetObjNum();
- (*pObjNumberMap)[dwSrcPageResourcesObj] = dwNewXobjectResourcesObj;
- CPDF_Dictionary* pNewXORes = pNewXObjectDict->GetDictFor(resourceString);
- UpdateReference(pNewXORes, pObjNumberMap.get());
+ pNewXObjectDict->SetNewFor<CPDF_Dictionary>(bsResourceString);
}
+ uint32_t dwSrcPageObj = pSrcPageDict->GetObjNum();
+ uint32_t dwNewXobjectObj = pNewXObjectDict->GetObjNum();
+ (*pObjNumberMap)[dwSrcPageObj] = dwNewXobjectObj;
+ UpdateReference(pNewXObjectDict, pObjNumberMap);
pNewXObjectDict->SetNewFor<CPDF_Name>("Type", "XObject");
pNewXObjectDict->SetNewFor<CPDF_Name>("Subtype", "Form");
@@ -426,26 +446,27 @@ CPDF_Object* CPDF_PageOrganizer::MakeXObject(CPDF_Dictionary* pSrcPageDict,
// TODO(xlou): add matrix field to pNewXObjectDict.
if (CPDF_Array* pSrcContentArray = ToArray(pSrcContentObj)) {
- ByteString srcContentStream;
+ ByteString bsSrcContentStream;
for (size_t i = 0; i < pSrcContentArray->GetCount(); ++i) {
CPDF_Stream* pStream = pSrcContentArray->GetStreamAt(i);
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
pAcc->LoadAllDataFiltered();
- ByteString sStream(pAcc->GetData(), pAcc->GetSize());
- srcContentStream += sStream;
- srcContentStream += "\n";
+ ByteString bsStream(pAcc->GetData(), pAcc->GetSize());
+ bsSrcContentStream += bsStream;
+ bsSrcContentStream += "\n";
}
- pNewXObject->SetDataAndRemoveFilter(srcContentStream.raw_str(),
- srcContentStream.GetLength());
+ pNewXObject->SetDataAndRemoveFilter(bsSrcContentStream.raw_str(),
+ bsSrcContentStream.GetLength());
} else {
CPDF_Stream* pStream = pSrcContentObj->AsStream();
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
pAcc->LoadAllDataFiltered();
- ByteString sStream(pAcc->GetData(), pAcc->GetSize());
- pNewXObject->SetDataAndRemoveFilter(sStream.raw_str(), sStream.GetLength());
+ ByteString bsStream(pAcc->GetData(), pAcc->GetSize());
+ pNewXObject->SetDataAndRemoveFilter(bsStream.raw_str(),
+ bsStream.GetLength());
}
- return pNewXObject;
+ return pNewXObject->GetObjNum();
}
// static
@@ -522,7 +543,8 @@ bool CPDF_PageOrganizer::ExportPage(const std::vector<uint32_t>& pageNums,
}
void CPDF_PageOrganizer::FinishPage(CPDF_Dictionary* pCurPageDict,
- const ByteString& content) {
+ const ByteString& bsContent,
+ XObjectNameNumberMap* pXObjNameNumberMap) {
ASSERT(pCurPageDict);
CPDF_Dictionary* pRes = pCurPageDict->GetDictFor("Resources");
@@ -533,20 +555,18 @@ void CPDF_PageOrganizer::FinishPage(CPDF_Dictionary* pCurPageDict,
if (!pPageXObject)
pPageXObject = pRes->SetNewFor<CPDF_Dictionary>("XObject");
- for (auto& it : m_xobjs) {
- CPDF_Object* pObj = it.second.Get();
+ for (auto& it : *pXObjNameNumberMap) {
pPageXObject->SetNewFor<CPDF_Reference>(it.first, m_pDestPDFDoc.Get(),
- pObj->GetObjNum());
+ it.second);
}
auto pDict = pdfium::MakeUnique<CPDF_Dictionary>(
m_pDestPDFDoc.Get()->GetByteStringPool());
CPDF_Stream* pStream = m_pDestPDFDoc.Get()->NewIndirect<CPDF_Stream>(
nullptr, 0, std::move(pDict));
- pStream->SetData(content.raw_str(), content.GetLength());
+ pStream->SetData(bsContent.raw_str(), bsContent.GetLength());
pCurPageDict->SetNewFor<CPDF_Reference>("Contents", m_pDestPDFDoc.Get(),
pStream->GetObjNum());
- m_xobjs.clear();
}
bool CPDF_PageOrganizer::ExportNPagesToOne(
@@ -564,7 +584,13 @@ bool CPDF_PageOrganizer::ExportNPagesToOne(
size_t numPagesPerSheet = safe_numPagesPerSheet.ValueOrDie();
if (numPagesPerSheet == 1)
return ExportPage(pageNums, 0);
-
+ // Mapping of source page object number and XObject object number.
+ // Used to update refernece.
+ ObjectNumberMap objectNumberMap;
+ // Mapping of source page object number and XObject name of the entire doc.
+ // If there are two pages that are identical and have the same object number,
+ // we can reuse one created XObject.
+ PageXObjectMap pageXObjectMap;
const CFX_SizeF pagesize(destPageWidth, destPageHeight);
NupState nupState(destPageWidth, destPageHeight, numPagesOnXAxis,
numPagesOnYAxis);
@@ -578,9 +604,11 @@ bool CPDF_PageOrganizer::ExportNPagesToOne(
return false;
SetMediaBox(pCurPageDict, pagesize);
- ByteString content;
+ ByteString bsContent;
size_t innerPageMax =
std::min(outerPage + numPagesPerSheet, pageNums.size());
+ // Mapping of XObject name and XObject object number of one page.
+ XObjectNameNumberMap xObjectNameNumberMap;
for (size_t innerPage = outerPage; innerPage < innerPageMax; ++innerPage) {
CPDF_Dictionary* pSrcPageDict =
m_pSrcPDFDoc->GetPage(pageNums[innerPage] - 1);
@@ -592,11 +620,12 @@ bool CPDF_PageOrganizer::ExportNPagesToOne(
nupState.CalculateNewPagePosition(srcPage.GetPageWidth(),
srcPage.GetPageHeight(), &pgEdit);
AddSubPage(pSrcPageDict, pgEdit.subPageStartPoint, pgEdit.scale,
- &content);
+ &objectNumberMap, &pageXObjectMap, &xObjectNameNumberMap,
+ &bsContent);
}
// Finish up the current page.
- FinishPage(pCurPageDict, content);
+ FinishPage(pCurPageDict, bsContent, &xObjectNameNumberMap);
++curpage;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-10 17:38:13 +0000