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// 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 "public/fpdf_ppo.h"
#include <algorithm>
#include <map>
#include <memory>
#include <numeric>
#include <sstream>
#include <utility>
#include <vector>
#include "constants/page_object.h"
#include "core/fpdfapi/page/cpdf_form.h"
#include "core/fpdfapi/page/cpdf_formobject.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_object.h"
#include "core/fpdfapi/parser/cpdf_reference.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fpdfapi/parser/cpdf_string.h"
#include "core/fpdfapi/render/cpdf_pagerendercache.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/unowned_ptr.h"
#include "fpdfsdk/cpdfsdk_helpers.h"
#include "public/cpp/fpdf_scopers.h"
#include "third_party/base/check.h"
#include "third_party/base/span.h"
struct XObjectContext {
CPDF_Document* dest_doc;
RetainPtr<CPDF_Stream> xobject;
};
namespace {
// Struct that stores sub page origin and scale information. When importing
// more than one pages onto the same page, most likely the pages will need to be
// scaled down, and scale is in range of (0, 1) exclusive.
struct NupPageSettings {
CFX_PointF subPageStartPoint;
float scale;
};
// Calculates the N-up parameters. When importing multiple pages into one page.
// The space of output page is evenly divided along the X axis and Y axis based
// on the input |nPagesOnXAxis| and |nPagesOnYAxis|.
class NupState {
public:
NupState(const CFX_SizeF& pagesize,
size_t nPagesOnXAxis,
size_t nPagesOnYAxis);
// Calculate sub page origin and scale with the source page of |pagesize| and
// new page of |m_subPageSize|.
NupPageSettings CalculateNewPagePosition(const CFX_SizeF& pagesize);
private:
// Helper function to get the |iSubX|, |iSubY| pair based on |m_subPageIndex|.
// The space of output page is evenly divided into slots along x and y axis.
// |iSubX| and |iSubY| are 0-based indices that indicate which allocation
// slot to use.
std::pair<size_t, size_t> ConvertPageOrder() const;
// Given the |iSubX| and |iSubY| subpage position within a page, and a source
// page with dimensions of |pagesize|, calculate the sub page's origin and
// scale.
NupPageSettings CalculatePageEdit(size_t iSubX,
size_t iSubY,
const CFX_SizeF& pagesize) const;
const CFX_SizeF m_destPageSize;
const size_t m_nPagesOnXAxis;
const size_t m_nPagesOnYAxis;
const size_t m_nPagesPerSheet;
CFX_SizeF m_subPageSize;
// A 0-based index, in range of [0, m_nPagesPerSheet - 1).
size_t m_subPageIndex = 0;
};
NupState::NupState(const CFX_SizeF& pagesize,
size_t nPagesOnXAxis,
size_t nPagesOnYAxis)
: m_destPageSize(pagesize),
m_nPagesOnXAxis(nPagesOnXAxis),
m_nPagesOnYAxis(nPagesOnYAxis),
m_nPagesPerSheet(nPagesOnXAxis * nPagesOnYAxis) {
DCHECK(m_nPagesOnXAxis > 0);
DCHECK(m_nPagesOnYAxis > 0);
DCHECK(m_destPageSize.width > 0);
DCHECK(m_destPageSize.height > 0);
m_subPageSize.width = m_destPageSize.width / m_nPagesOnXAxis;
m_subPageSize.height = m_destPageSize.height / m_nPagesOnYAxis;
}
std::pair<size_t, size_t> NupState::ConvertPageOrder() const {
size_t iSubX = m_subPageIndex % m_nPagesOnXAxis;
size_t iSubY = m_subPageIndex / m_nPagesOnXAxis;
// Y Axis, pages start from the top of the output page.
iSubY = m_nPagesOnYAxis - iSubY - 1;
return {iSubX, iSubY};
}
NupPageSettings NupState::CalculatePageEdit(size_t iSubX,
size_t iSubY,
const CFX_SizeF& pagesize) const {
NupPageSettings settings;
settings.subPageStartPoint.x = iSubX * m_subPageSize.width;
settings.subPageStartPoint.y = iSubY * m_subPageSize.height;
const float xScale = m_subPageSize.width / pagesize.width;
const float yScale = m_subPageSize.height / pagesize.height;
settings.scale = std::min(xScale, yScale);
float subWidth = pagesize.width * settings.scale;
float subHeight = pagesize.height * settings.scale;
if (xScale > yScale)
settings.subPageStartPoint.x += (m_subPageSize.width - subWidth) / 2;
else
settings.subPageStartPoint.y += (m_subPageSize.height - subHeight) / 2;
return settings;
}
NupPageSettings NupState::CalculateNewPagePosition(const CFX_SizeF& pagesize) {
if (m_subPageIndex >= m_nPagesPerSheet)
m_subPageIndex = 0;
size_t iSubX;
size_t iSubY;
std::tie(iSubX, iSubY) = ConvertPageOrder();
++m_subPageIndex;
return CalculatePageEdit(iSubX, iSubY, pagesize);
}
const CPDF_Object* PageDictGetInheritableTag(const CPDF_Dictionary* pDict,
const ByteString& bsSrcTag) {
if (!pDict || bsSrcTag.IsEmpty())
return nullptr;
if (!pDict->KeyExist(pdfium::page_object::kParent) ||
!pDict->KeyExist(pdfium::page_object::kType)) {
return nullptr;
}
const CPDF_Name* pName =
ToName(pDict->GetObjectFor(pdfium::page_object::kType)->GetDirect());
if (!pName || pName->GetString() != "Page")
return nullptr;
const CPDF_Dictionary* pp = ToDictionary(
pDict->GetObjectFor(pdfium::page_object::kParent)->GetDirect());
if (!pp)
return nullptr;
if (pDict->KeyExist(bsSrcTag))
return pDict->GetObjectFor(bsSrcTag);
while (pp) {
if (pp->KeyExist(bsSrcTag))
return pp->GetObjectFor(bsSrcTag);
if (!pp->KeyExist(pdfium::page_object::kParent))
break;
pp = ToDictionary(
pp->GetObjectFor(pdfium::page_object::kParent)->GetDirect());
}
return nullptr;
}
bool CopyInheritable(CPDF_Dictionary* pDestPageDict,
const CPDF_Dictionary* pSrcPageDict,
const ByteString& key) {
if (pDestPageDict->KeyExist(key))
return true;
const CPDF_Object* pInheritable =
PageDictGetInheritableTag(pSrcPageDict, key);
if (!pInheritable)
return false;
pDestPageDict->SetFor(key, pInheritable->Clone());
return true;
}
std::vector<uint32_t> GetPageIndices(const CPDF_Document& doc,
const ByteString& bsPageRange) {
uint32_t nCount = doc.GetPageCount();
if (!bsPageRange.IsEmpty())
return ParsePageRangeString(bsPageRange, nCount);
std::vector<uint32_t> page_indices(nCount);
std::iota(page_indices.begin(), page_indices.end(), 0);
return page_indices;
}
class CPDF_PageOrganizer {
protected:
CPDF_PageOrganizer(CPDF_Document* pDestDoc, CPDF_Document* pSrcDoc);
~CPDF_PageOrganizer();
// Must be called after construction before doing anything else.
bool Init();
bool UpdateReference(CPDF_Object* pObj);
CPDF_Document* dest() { return m_pDestDoc.Get(); }
const CPDF_Document* dest() const { return m_pDestDoc.Get(); }
CPDF_Document* src() { return m_pSrcDoc.Get(); }
const CPDF_Document* src() const { return m_pSrcDoc.Get(); }
void AddObjectMapping(uint32_t dwOldPageObj, uint32_t dwNewPageObj) {
m_ObjectNumberMap[dwOldPageObj] = dwNewPageObj;
}
void ClearObjectNumberMap() { m_ObjectNumberMap.clear(); }
private:
uint32_t GetNewObjId(CPDF_Reference* pRef);
UnownedPtr<CPDF_Document> const m_pDestDoc;
UnownedPtr<CPDF_Document> const m_pSrcDoc;
// Mapping of source object number to destination object number.
std::map<uint32_t, uint32_t> m_ObjectNumberMap;
};
CPDF_PageOrganizer::CPDF_PageOrganizer(CPDF_Document* pDestDoc,
CPDF_Document* pSrcDoc)
: m_pDestDoc(pDestDoc), m_pSrcDoc(pSrcDoc) {}
CPDF_PageOrganizer::~CPDF_PageOrganizer() = default;
bool CPDF_PageOrganizer::Init() {
DCHECK(m_pDestDoc);
DCHECK(m_pSrcDoc);
CPDF_Dictionary* pNewRoot = dest()->GetRoot();
if (!pNewRoot)
return false;
CPDF_Dictionary* pDocInfoDict = dest()->GetInfo();
if (!pDocInfoDict)
return false;
pDocInfoDict->SetNewFor<CPDF_String>("Producer", "PDFium", false);
ByteString cbRootType = pNewRoot->GetStringFor("Type", ByteString());
if (cbRootType.IsEmpty())
pNewRoot->SetNewFor<CPDF_Name>("Type", "Catalog");
CPDF_Object* pElement = pNewRoot->GetObjectFor("Pages");
CPDF_Dictionary* pNewPages =
pElement ? ToDictionary(pElement->GetDirect()) : nullptr;
if (!pNewPages) {
pNewPages = dest()->NewIndirect<CPDF_Dictionary>();
pNewRoot->SetNewFor<CPDF_Reference>("Pages", dest(),
pNewPages->GetObjNum());
}
ByteString cbPageType = pNewPages->GetStringFor("Type", ByteString());
if (cbPageType.IsEmpty())
pNewPages->SetNewFor<CPDF_Name>("Type", "Pages");
if (!pNewPages->GetArrayFor("Kids")) {
auto* pNewArray = dest()->NewIndirect<CPDF_Array>();
pNewPages->SetNewFor<CPDF_Number>("Count", 0);
pNewPages->SetNewFor<CPDF_Reference>("Kids", dest(),
pNewArray->GetObjNum());
}
return true;
}
bool CPDF_PageOrganizer::UpdateReference(CPDF_Object* pObj) {
switch (pObj->GetType()) {
case CPDF_Object::kReference: {
CPDF_Reference* pReference = pObj->AsReference();
uint32_t newobjnum = GetNewObjId(pReference);
if (newobjnum == 0)
return false;
pReference->SetRef(dest(), newobjnum);
return true;
}
case CPDF_Object::kDictionary: {
CPDF_Dictionary* pDict = pObj->AsDictionary();
std::vector<ByteString> bad_keys;
{
CPDF_DictionaryLocker locker(pDict);
for (const auto& it : locker) {
const ByteString& key = it.first;
if (key == "Parent" || key == "Prev" || key == "First")
continue;
CPDF_Object* pNextObj = it.second.Get();
if (!UpdateReference(pNextObj))
bad_keys.push_back(key);
}
}
for (const auto& key : bad_keys)
pDict->RemoveFor(key);
return true;
}
case CPDF_Object::kArray: {
CPDF_Array* pArray = pObj->AsArray();
for (size_t i = 0; i < pArray->size(); ++i) {
if (!UpdateReference(pArray->GetObjectAt(i)))
return false;
}
return true;
}
case CPDF_Object::kStream: {
CPDF_Stream* pStream = pObj->AsStream();
CPDF_Dictionary* pDict = pStream->GetDict();
return pDict && UpdateReference(pDict);
}
default:
return true;
}
}
uint32_t CPDF_PageOrganizer::GetNewObjId(CPDF_Reference* pRef) {
if (!pRef)
return 0;
uint32_t dwObjnum = pRef->GetRefObjNum();
uint32_t dwNewObjNum = 0;
const auto it = m_ObjectNumberMap.find(dwObjnum);
if (it != m_ObjectNumberMap.end())
dwNewObjNum = it->second;
if (dwNewObjNum)
return dwNewObjNum;
CPDF_Object* pDirect = pRef->GetDirect();
if (!pDirect)
return 0;
RetainPtr<CPDF_Object> pClone = pDirect->Clone();
if (CPDF_Dictionary* pDictClone = pClone->AsDictionary()) {
if (pDictClone->KeyExist("Type")) {
ByteString strType = pDictClone->GetStringFor("Type");
if (strType.EqualNoCase("Pages"))
return 4;
if (strType.EqualNoCase("Page"))
return 0;
}
}
CPDF_Object* pUnownedClone = dest()->AddIndirectObject(std::move(pClone));
dwNewObjNum = pUnownedClone->GetObjNum();
AddObjectMapping(dwObjnum, dwNewObjNum);
if (!UpdateReference(pUnownedClone))
return 0;
return dwNewObjNum;
}
// Copies pages from a source document into a destination document.
// This class is intended to be used once via ExportPage() and then destroyed.
class CPDF_PageExporter final : public CPDF_PageOrganizer {
public:
CPDF_PageExporter(CPDF_Document* pDestDoc, CPDF_Document* pSrcDoc);
~CPDF_PageExporter();
// For the pages from the source document with |pageIndices| as their page
// indices, insert them into the destination document at page |nIndex|.
// |pageIndices| and |nIndex| are 0-based.
bool ExportPage(pdfium::span<const uint32_t> pageIndices, int nIndex);
};
CPDF_PageExporter::CPDF_PageExporter(CPDF_Document* pDestDoc,
CPDF_Document* pSrcDoc)
: CPDF_PageOrganizer(pDestDoc, pSrcDoc) {}
CPDF_PageExporter::~CPDF_PageExporter() = default;
bool CPDF_PageExporter::ExportPage(pdfium::span<const uint32_t> pageIndices,
int nIndex) {
if (!Init())
return false;
int curpage = nIndex;
for (uint32_t pageIndex : pageIndices) {
CPDF_Dictionary* pDestPageDict = dest()->CreateNewPage(curpage);
auto* pSrcPageDict = src()->GetPageDictionary(pageIndex);
if (!pSrcPageDict || !pDestPageDict)
return false;
// Clone the page dictionary
CPDF_DictionaryLocker locker(pSrcPageDict);
for (const auto& it : locker) {
const ByteString& cbSrcKeyStr = it.first;
if (cbSrcKeyStr == pdfium::page_object::kType ||
cbSrcKeyStr == pdfium::page_object::kParent) {
continue;
}
CPDF_Object* pObj = it.second.Get();
pDestPageDict->SetFor(cbSrcKeyStr, pObj->Clone());
}
// inheritable item
// Even though some entries are required by the PDF spec, there exist
// PDFs that omit them. Set some defaults in this case.
// 1 MediaBox - required
if (!CopyInheritable(pDestPageDict, pSrcPageDict,
pdfium::page_object::kMediaBox)) {
// Search for "CropBox" in the source page dictionary.
// If it does not exist, use the default letter size.
const CPDF_Object* pInheritable = PageDictGetInheritableTag(
pSrcPageDict, pdfium::page_object::kCropBox);
if (pInheritable) {
pDestPageDict->SetFor(pdfium::page_object::kMediaBox,
pInheritable->Clone());
} else {
// Make the default size letter size (8.5"x11")
static const CFX_FloatRect kDefaultLetterRect(0, 0, 612, 792);
pDestPageDict->SetRectFor(pdfium::page_object::kMediaBox,
kDefaultLetterRect);
}
}
// 2 Resources - required
if (!CopyInheritable(pDestPageDict, pSrcPageDict,
pdfium::page_object::kResources)) {
// Use a default empty resources if it does not exist.
pDestPageDict->SetNewFor<CPDF_Dictionary>(
pdfium::page_object::kResources);
}
// 3 CropBox - optional
CopyInheritable(pDestPageDict, pSrcPageDict, pdfium::page_object::kCropBox);
// 4 Rotate - optional
CopyInheritable(pDestPageDict, pSrcPageDict, pdfium::page_object::kRotate);
// Update the reference
uint32_t dwOldPageObj = pSrcPageDict->GetObjNum();
uint32_t dwNewPageObj = pDestPageDict->GetObjNum();
AddObjectMapping(dwOldPageObj, dwNewPageObj);
UpdateReference(pDestPageDict);
++curpage;
}
return true;
}
// Copies pages from a source document into a destination document. Creates 1
// page in the destination document for every N source pages. This class is
// intended to be used once via ExportNPagesToOne() and then destroyed.
class CPDF_NPageToOneExporter final : public CPDF_PageOrganizer {
public:
CPDF_NPageToOneExporter(CPDF_Document* pDestDoc, CPDF_Document* pSrcDoc);
~CPDF_NPageToOneExporter();
// For the pages from the source document with |pageIndices| as their page
// indices, insert them into the destination document, starting at page index
// 0.
// |pageIndices| is 0-based.
// |destPageSize| is the destination document page dimensions, measured in
// PDF "user space" units.
// |nPagesOnXAxis| and |nPagesOnXAxis| together defines how many source
// pages fit on one destination page.
bool ExportNPagesToOne(pdfium::span<const uint32_t> pageIndices,
const CFX_SizeF& destPageSize,
size_t nPagesOnXAxis,
size_t nPagesOnYAxis);
std::unique_ptr<XObjectContext> CreateXObjectContextFromPage(
int src_page_index);
private:
// Map page object number to XObject object name.
using PageXObjectMap = std::map<uint32_t, ByteString>;
// Creates an XObject from |pSrcPage|, or find an existing XObject that
// represents |pSrcPage|. The transformation matrix is specified in
// |settings|.
// Returns the XObject reference surrounded by the transformation matrix.
ByteString AddSubPage(const RetainPtr<CPDF_Page>& pSrcPage,
const NupPageSettings& settings);
// Creates an XObject from |pSrcPage|. Updates mapping as needed.
// Returns the name of the newly created XObject.
ByteString MakeXObjectFromPage(const RetainPtr<CPDF_Page>& pSrcPage);
CPDF_Stream* MakeXObjectFromPageRaw(const RetainPtr<CPDF_Page>& pSrcPage);
// Adds |bsContent| as the Contents key in |pDestPageDict|.
// Adds the objects in |m_XObjectNameToNumberMap| to the XObject dictionary in
// |pDestPageDict|'s Resources dictionary.
void FinishPage(CPDF_Dictionary* pDestPageDict, const ByteString& bsContent);
// Counter for giving new XObjects unique names.
uint32_t m_nObjectNumber = 0;
// Keeps track of created XObjects in the current page.
// Map XObject's object name to it's object number.
std::map<ByteString, uint32_t> m_XObjectNameToNumberMap;
// Mapping of source page object number and XObject name of the entire doc.
// If there are multiple source pages that reference the same object number,
// they can also share the same created XObject.
PageXObjectMap m_SrcPageXObjectMap;
};
CPDF_NPageToOneExporter::CPDF_NPageToOneExporter(CPDF_Document* pDestDoc,
CPDF_Document* pSrcDoc)
: CPDF_PageOrganizer(pDestDoc, pSrcDoc) {}
CPDF_NPageToOneExporter::~CPDF_NPageToOneExporter() = default;
bool CPDF_NPageToOneExporter::ExportNPagesToOne(
pdfium::span<const uint32_t> pageIndices,
const CFX_SizeF& destPageSize,
size_t nPagesOnXAxis,
size_t nPagesOnYAxis) {
if (!Init())
return false;
FX_SAFE_SIZE_T nSafePagesPerSheet = nPagesOnXAxis;
nSafePagesPerSheet *= nPagesOnYAxis;
if (!nSafePagesPerSheet.IsValid())
return false;
ClearObjectNumberMap();
m_SrcPageXObjectMap.clear();
size_t nPagesPerSheet = nSafePagesPerSheet.ValueOrDie();
NupState nupState(destPageSize, nPagesOnXAxis, nPagesOnYAxis);
size_t curpage = 0;
const CFX_FloatRect destPageRect(0, 0, destPageSize.width,
destPageSize.height);
for (size_t iOuterPage = 0; iOuterPage < pageIndices.size();
iOuterPage += nPagesPerSheet) {
m_XObjectNameToNumberMap.clear();
// Create a new page
CPDF_Dictionary* pDestPageDict = dest()->CreateNewPage(curpage);
if (!pDestPageDict)
return false;
pDestPageDict->SetRectFor(pdfium::page_object::kMediaBox, destPageRect);
ByteString bsContent;
size_t iInnerPageMax =
std::min(iOuterPage + nPagesPerSheet, pageIndices.size());
for (size_t i = iOuterPage; i < iInnerPageMax; ++i) {
auto* pSrcPageDict = src()->GetPageDictionary(pageIndices[i]);
if (!pSrcPageDict)
return false;
auto pSrcPage = pdfium::MakeRetain<CPDF_Page>(src(), pSrcPageDict);
pSrcPage->SetRenderCache(
std::make_unique<CPDF_PageRenderCache>(pSrcPage.Get()));
NupPageSettings settings =
nupState.CalculateNewPagePosition(pSrcPage->GetPageSize());
bsContent += AddSubPage(pSrcPage, settings);
}
FinishPage(pDestPageDict, bsContent);
++curpage;
}
return true;
}
ByteString CPDF_NPageToOneExporter::AddSubPage(
const RetainPtr<CPDF_Page>& pSrcPage,
const NupPageSettings& settings) {
uint32_t dwSrcPageObjnum = pSrcPage->GetDict()->GetObjNum();
const auto it = m_SrcPageXObjectMap.find(dwSrcPageObjnum);
ByteString bsXObjectName = it != m_SrcPageXObjectMap.end()
? it->second
: MakeXObjectFromPage(pSrcPage);
CFX_Matrix matrix;
matrix.Scale(settings.scale, settings.scale);
matrix.Translate(settings.subPageStartPoint.x, settings.subPageStartPoint.y);
fxcrt::ostringstream contentStream;
contentStream << "q\n"
<< matrix.a << " " << matrix.b << " " << matrix.c << " "
<< matrix.d << " " << matrix.e << " " << matrix.f << " cm\n"
<< "/" << bsXObjectName << " Do Q\n";
return ByteString(contentStream);
}
CPDF_Stream* CPDF_NPageToOneExporter::MakeXObjectFromPageRaw(
const RetainPtr<CPDF_Page>& pSrcPage) {
const CPDF_Dictionary* pSrcPageDict = pSrcPage->GetDict();
const CPDF_Object* pSrcContentObj =
pSrcPageDict->GetDirectObjectFor(pdfium::page_object::kContents);
CPDF_Stream* pNewXObject = dest()->NewIndirect<CPDF_Stream>(
nullptr, 0, dest()->New<CPDF_Dictionary>());
CPDF_Dictionary* pNewXObjectDict = pNewXObject->GetDict();
static const char kResourceString[] = "Resources";
if (!CopyInheritable(pNewXObjectDict, pSrcPageDict, kResourceString)) {
// Use a default empty resources if it does not exist.
pNewXObjectDict->SetNewFor<CPDF_Dictionary>(kResourceString);
}
uint32_t dwSrcPageObj = pSrcPageDict->GetObjNum();
uint32_t dwNewXobjectObj = pNewXObjectDict->GetObjNum();
AddObjectMapping(dwSrcPageObj, dwNewXobjectObj);
UpdateReference(pNewXObjectDict);
pNewXObjectDict->SetNewFor<CPDF_Name>("Type", "XObject");
pNewXObjectDict->SetNewFor<CPDF_Name>("Subtype", "Form");
pNewXObjectDict->SetNewFor<CPDF_Number>("FormType", 1);
pNewXObjectDict->SetRectFor("BBox", pSrcPage->GetBBox());
pNewXObjectDict->SetMatrixFor("Matrix", pSrcPage->GetPageMatrix());
if (pSrcContentObj) {
ByteString bsSrcContentStream;
const CPDF_Array* pSrcContentArray = ToArray(pSrcContentObj);
if (pSrcContentArray) {
for (size_t i = 0; i < pSrcContentArray->size(); ++i) {
const CPDF_Stream* pStream = pSrcContentArray->GetStreamAt(i);
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
pAcc->LoadAllDataFiltered();
bsSrcContentStream += ByteString(pAcc->GetSpan());
bsSrcContentStream += "\n";
}
} else {
const CPDF_Stream* pStream = pSrcContentObj->AsStream();
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
pAcc->LoadAllDataFiltered();
bsSrcContentStream = ByteString(pAcc->GetSpan());
}
pNewXObject->SetDataAndRemoveFilter(bsSrcContentStream.raw_span());
}
return pNewXObject;
}
ByteString CPDF_NPageToOneExporter::MakeXObjectFromPage(
const RetainPtr<CPDF_Page>& pSrcPage) {
CPDF_Stream* pNewXObject = MakeXObjectFromPageRaw(pSrcPage);
// TODO(xlou): A better name schema to avoid possible object name collision.
ByteString bsXObjectName = ByteString::Format("X%d", ++m_nObjectNumber);
m_XObjectNameToNumberMap[bsXObjectName] = pNewXObject->GetObjNum();
m_SrcPageXObjectMap[pSrcPage->GetDict()->GetObjNum()] = bsXObjectName;
return bsXObjectName;
}
std::unique_ptr<XObjectContext>
CPDF_NPageToOneExporter::CreateXObjectContextFromPage(int src_page_index) {
CPDF_Dictionary* src_page_dict = src()->GetPageDictionary(src_page_index);
if (!src_page_dict)
return nullptr;
auto src_page = pdfium::MakeRetain<CPDF_Page>(src(), src_page_dict);
auto xobject = std::make_unique<XObjectContext>();
xobject->dest_doc = dest();
xobject->xobject = MakeXObjectFromPageRaw(src_page);
return xobject;
}
void CPDF_NPageToOneExporter::FinishPage(CPDF_Dictionary* pDestPageDict,
const ByteString& bsContent) {
DCHECK(pDestPageDict);
CPDF_Dictionary* pRes =
pDestPageDict->GetDictFor(pdfium::page_object::kResources);
if (!pRes) {
pRes = pDestPageDict->SetNewFor<CPDF_Dictionary>(
pdfium::page_object::kResources);
}
CPDF_Dictionary* pPageXObject = pRes->GetDictFor("XObject");
if (!pPageXObject)
pPageXObject = pRes->SetNewFor<CPDF_Dictionary>("XObject");
for (auto& it : m_XObjectNameToNumberMap)
pPageXObject->SetNewFor<CPDF_Reference>(it.first, dest(), it.second);
auto pDict = dest()->New<CPDF_Dictionary>();
CPDF_Stream* pStream =
dest()->NewIndirect<CPDF_Stream>(nullptr, 0, std::move(pDict));
pStream->SetData(bsContent.raw_span());
pDestPageDict->SetNewFor<CPDF_Reference>(pdfium::page_object::kContents,
dest(), pStream->GetObjNum());
}
} // namespace
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDF_ImportPagesByIndex(FPDF_DOCUMENT dest_doc,
FPDF_DOCUMENT src_doc,
const int* page_indices,
unsigned long length,
int index) {
CPDF_Document* pDestDoc = CPDFDocumentFromFPDFDocument(dest_doc);
if (!dest_doc)
return false;
CPDF_Document* pSrcDoc = CPDFDocumentFromFPDFDocument(src_doc);
if (!pSrcDoc)
return false;
CPDF_PageExporter exporter(pDestDoc, pSrcDoc);
if (!page_indices) {
std::vector<uint32_t> page_indices_vec(pSrcDoc->GetPageCount());
std::iota(page_indices_vec.begin(), page_indices_vec.end(), 0);
return exporter.ExportPage(page_indices_vec, index);
}
if (length == 0)
return false;
return exporter.ExportPage(
pdfium::make_span(reinterpret_cast<const uint32_t*>(page_indices),
length),
index);
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_ImportPages(FPDF_DOCUMENT dest_doc,
FPDF_DOCUMENT src_doc,
FPDF_BYTESTRING pagerange,
int index) {
CPDF_Document* pDestDoc = CPDFDocumentFromFPDFDocument(dest_doc);
if (!dest_doc)
return false;
CPDF_Document* pSrcDoc = CPDFDocumentFromFPDFDocument(src_doc);
if (!pSrcDoc)
return false;
std::vector<uint32_t> page_indices = GetPageIndices(*pSrcDoc, pagerange);
if (page_indices.empty())
return false;
CPDF_PageExporter exporter(pDestDoc, pSrcDoc);
return exporter.ExportPage(page_indices, index);
}
FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
FPDF_ImportNPagesToOne(FPDF_DOCUMENT src_doc,
float output_width,
float output_height,
size_t num_pages_on_x_axis,
size_t num_pages_on_y_axis) {
CPDF_Document* pSrcDoc = CPDFDocumentFromFPDFDocument(src_doc);
if (!pSrcDoc)
return nullptr;
if (output_width <= 0 || output_height <= 0 || num_pages_on_x_axis <= 0 ||
num_pages_on_y_axis <= 0) {
return nullptr;
}
ScopedFPDFDocument output_doc(FPDF_CreateNewDocument());
if (!output_doc)
return nullptr;
CPDF_Document* pDestDoc = CPDFDocumentFromFPDFDocument(output_doc.get());
DCHECK(pDestDoc);
std::vector<uint32_t> page_indices = GetPageIndices(*pSrcDoc, ByteString());
if (page_indices.empty())
return nullptr;
if (num_pages_on_x_axis == 1 && num_pages_on_y_axis == 1) {
CPDF_PageExporter exporter(pDestDoc, pSrcDoc);
if (!exporter.ExportPage(page_indices, 0))
return nullptr;
return output_doc.release();
}
CPDF_NPageToOneExporter exporter(pDestDoc, pSrcDoc);
if (!exporter.ExportNPagesToOne(page_indices,
CFX_SizeF(output_width, output_height),
num_pages_on_x_axis, num_pages_on_y_axis)) {
return nullptr;
}
return output_doc.release();
}
FPDF_EXPORT FPDF_XOBJECT FPDF_CALLCONV
FPDF_NewXObjectFromPage(FPDF_DOCUMENT dest_doc,
FPDF_DOCUMENT src_doc,
int src_page_index) {
CPDF_Document* dest = CPDFDocumentFromFPDFDocument(dest_doc);
if (!dest)
return nullptr;
CPDF_Document* src = CPDFDocumentFromFPDFDocument(src_doc);
if (!src)
return nullptr;
CPDF_NPageToOneExporter exporter(dest, src);
std::unique_ptr<XObjectContext> xobject =
exporter.CreateXObjectContextFromPage(src_page_index);
return FPDFXObjectFromXObjectContext(xobject.release());
}
FPDF_EXPORT void FPDF_CALLCONV FPDF_CloseXObject(FPDF_XOBJECT xobject) {
std::unique_ptr<XObjectContext> xobject_deleter(
XObjectContextFromFPDFXObject(xobject));
}
FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
FPDF_NewFormObjectFromXObject(FPDF_XOBJECT xobject) {
XObjectContext* xobj = XObjectContextFromFPDFXObject(xobject);
if (!xobj)
return nullptr;
// If used directly with std::make_unique(), linking fails.
// Build toolchain bug?
constexpr int kNoContentStream = CPDF_PageObject::kNoContentStream;
auto form = std::make_unique<CPDF_Form>(xobj->dest_doc, nullptr,
xobj->xobject.Get(), nullptr);
auto form_object = std::make_unique<CPDF_FormObject>(
kNoContentStream, std::move(form), CFX_Matrix());
return FPDFPageObjectFromCPDFPageObject(form_object.release());
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDF_CopyViewerPreferences(FPDF_DOCUMENT dest_doc, FPDF_DOCUMENT src_doc) {
CPDF_Document* pDstDoc = CPDFDocumentFromFPDFDocument(dest_doc);
if (!pDstDoc)
return false;
CPDF_Document* pSrcDoc = CPDFDocumentFromFPDFDocument(src_doc);
if (!pSrcDoc)
return false;
const CPDF_Dictionary* pSrcDict = pSrcDoc->GetRoot();
pSrcDict = pSrcDict->GetDictFor("ViewerPreferences");
if (!pSrcDict)
return false;
CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
if (!pDstDict)
return false;
pDstDict->SetFor("ViewerPreferences", pSrcDict->CloneDirectObject());
return true;
}