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// Copyright 2016 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 "core/fpdfapi/fpdf_edit/include/cpdf_pagecontentgenerator.h"
#include "core/fpdfapi/fpdf_edit/include/cpdf_creator.h"
#include "core/fpdfapi/fpdf_page/include/cpdf_imageobject.h"
#include "core/fpdfapi/fpdf_page/include/cpdf_page.h"
#include "core/fpdfapi/fpdf_page/include/cpdf_pageobject.h"
#include "core/fpdfapi/fpdf_page/pageint.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
#include "core/fpdfapi/fpdf_parser/include/fpdf_parser_decode.h"
CFX_ByteTextBuf& operator<<(CFX_ByteTextBuf& ar, CFX_Matrix& matrix) {
ar << matrix.a << " " << matrix.b << " " << matrix.c << " " << matrix.d << " "
<< matrix.e << " " << matrix.f;
return ar;
}
CPDF_PageContentGenerator::CPDF_PageContentGenerator(CPDF_Page* pPage)
: m_pPage(pPage), m_pDocument(m_pPage->m_pDocument) {
for (const auto& pObj : *pPage->GetPageObjectList())
InsertPageObject(pObj.get());
}
FX_BOOL CPDF_PageContentGenerator::InsertPageObject(
CPDF_PageObject* pPageObject) {
return pPageObject && m_pageObjects.Add(pPageObject);
}
void CPDF_PageContentGenerator::GenerateContent() {
CFX_ByteTextBuf buf;
CPDF_Dictionary* pPageDict = m_pPage->m_pFormDict;
for (int i = 0; i < m_pageObjects.GetSize(); ++i) {
CPDF_PageObject* pPageObj = m_pageObjects[i];
if (!pPageObj || !pPageObj->IsImage()) {
continue;
}
ProcessImage(buf, pPageObj->AsImage());
}
CPDF_Object* pContent =
pPageDict ? pPageDict->GetElementValue("Contents") : NULL;
if (pContent) {
pPageDict->RemoveAt("Contents");
}
CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
pStream->SetData(buf.GetBuffer(), buf.GetLength(), FALSE, FALSE);
m_pDocument->AddIndirectObject(pStream);
pPageDict->SetAtReference("Contents", m_pDocument, pStream->GetObjNum());
}
CFX_ByteString CPDF_PageContentGenerator::RealizeResource(
CPDF_Object* pResourceObj,
const FX_CHAR* szType) {
if (!m_pPage->m_pResources) {
m_pPage->m_pResources = new CPDF_Dictionary;
int objnum = m_pDocument->AddIndirectObject(m_pPage->m_pResources);
m_pPage->m_pFormDict->SetAtReference("Resources", m_pDocument, objnum);
}
CPDF_Dictionary* pResList = m_pPage->m_pResources->GetDictBy(szType);
if (!pResList) {
pResList = new CPDF_Dictionary;
m_pPage->m_pResources->SetAt(szType, pResList);
}
m_pDocument->AddIndirectObject(pResourceObj);
CFX_ByteString name;
int idnum = 1;
while (1) {
name.Format("FX%c%d", szType[0], idnum);
if (!pResList->KeyExist(name)) {
break;
}
idnum++;
}
pResList->AddReference(name, m_pDocument, pResourceObj->GetObjNum());
return name;
}
void CPDF_PageContentGenerator::ProcessImage(CFX_ByteTextBuf& buf,
CPDF_ImageObject* pImageObj) {
if ((pImageObj->m_Matrix.a == 0 && pImageObj->m_Matrix.b == 0) ||
(pImageObj->m_Matrix.c == 0 && pImageObj->m_Matrix.d == 0)) {
return;
}
buf << "q " << pImageObj->m_Matrix << " cm ";
if (!pImageObj->m_pImage->IsInline()) {
CPDF_Stream* pStream = pImageObj->m_pImage->GetStream();
FX_DWORD dwSavedObjNum = pStream->GetObjNum();
CFX_ByteString name = RealizeResource(pStream, "XObject");
if (dwSavedObjNum == 0) {
if (pImageObj->m_pImage)
pImageObj->m_pImage->Release();
pImageObj->m_pImage = m_pDocument->GetPageData()->GetImage(pStream);
}
buf << "/" << PDF_NameEncode(name) << " Do Q\n";
}
}
void CPDF_PageContentGenerator::ProcessForm(CFX_ByteTextBuf& buf,
const uint8_t* data,
FX_DWORD size,
CFX_Matrix& matrix) {
if (!data || !size) {
return;
}
CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
CPDF_Dictionary* pFormDict = new CPDF_Dictionary;
pFormDict->SetAtName("Type", "XObject");
pFormDict->SetAtName("Subtype", "Form");
CFX_FloatRect bbox = m_pPage->GetPageBBox();
matrix.TransformRect(bbox);
pFormDict->SetAtRect("BBox", bbox);
pStream->InitStream((uint8_t*)data, size, pFormDict);
buf << "q " << matrix << " cm ";
CFX_ByteString name = RealizeResource(pStream, "XObject");
buf << "/" << PDF_NameEncode(name) << " Do Q\n";
}
void CPDF_PageContentGenerator::TransformContent(CFX_Matrix& matrix) {
CPDF_Dictionary* pDict = m_pPage->m_pFormDict;
CPDF_Object* pContent = pDict ? pDict->GetElementValue("Contents") : NULL;
if (!pContent)
return;
CFX_ByteTextBuf buf;
if (CPDF_Array* pArray = pContent->AsArray()) {
int iCount = pArray->GetCount();
CPDF_StreamAcc** pContentArray = FX_Alloc(CPDF_StreamAcc*, iCount);
int size = 0;
int i = 0;
for (i = 0; i < iCount; ++i) {
pContent = pArray->GetElement(i);
CPDF_Stream* pStream = ToStream(pContent);
if (!pStream)
continue;
CPDF_StreamAcc* pStreamAcc = new CPDF_StreamAcc();
pStreamAcc->LoadAllData(pStream);
pContentArray[i] = pStreamAcc;
size += pContentArray[i]->GetSize() + 1;
}
int pos = 0;
uint8_t* pBuf = FX_Alloc(uint8_t, size);
for (i = 0; i < iCount; ++i) {
FXSYS_memcpy(pBuf + pos, pContentArray[i]->GetData(),
pContentArray[i]->GetSize());
pos += pContentArray[i]->GetSize() + 1;
pBuf[pos - 1] = ' ';
delete pContentArray[i];
}
ProcessForm(buf, pBuf, size, matrix);
FX_Free(pBuf);
FX_Free(pContentArray);
} else if (CPDF_Stream* pStream = pContent->AsStream()) {
CPDF_StreamAcc contentStream;
contentStream.LoadAllData(pStream);
ProcessForm(buf, contentStream.GetData(), contentStream.GetSize(), matrix);
}
CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
pStream->SetData(buf.GetBuffer(), buf.GetLength(), FALSE, FALSE);
m_pDocument->AddIndirectObject(pStream);
m_pPage->m_pFormDict->SetAtReference("Contents", m_pDocument,
pStream->GetObjNum());
}
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