| // 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/edit/cpdf_pagecontentgenerator.h" |
| |
| #include "core/fpdfapi/page/cpdf_docpagedata.h" |
| #include "core/fpdfapi/page/cpdf_image.h" |
| #include "core/fpdfapi/page/cpdf_imageobject.h" |
| #include "core/fpdfapi/page/cpdf_page.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_reference.h" |
| #include "core/fpdfapi/parser/cpdf_stream.h" |
| #include "core/fpdfapi/parser/fpdf_parser_decode.h" |
| |
| namespace { |
| |
| CFX_ByteTextBuf& operator<<(CFX_ByteTextBuf& ar, const CFX_Matrix& matrix) { |
| ar << matrix.a << " " << matrix.b << " " << matrix.c << " " << matrix.d << " " |
| << matrix.e << " " << matrix.f; |
| return ar; |
| } |
| |
| } // namespace |
| |
| CPDF_PageContentGenerator::CPDF_PageContentGenerator(CPDF_Page* pPage) |
| : m_pPage(pPage), m_pDocument(m_pPage->m_pDocument) { |
| for (const auto& pObj : *pPage->GetPageObjectList()) { |
| if (pObj) |
| m_pageObjects.push_back(pObj.get()); |
| } |
| } |
| |
| CPDF_PageContentGenerator::~CPDF_PageContentGenerator() {} |
| |
| void CPDF_PageContentGenerator::GenerateContent() { |
| CFX_ByteTextBuf buf; |
| for (CPDF_PageObject* pPageObj : m_pageObjects) { |
| CPDF_ImageObject* pImageObject = pPageObj->AsImage(); |
| if (pImageObject) |
| ProcessImage(&buf, pImageObject); |
| } |
| CPDF_Dictionary* pPageDict = m_pPage->m_pFormDict; |
| CPDF_Object* pContent = |
| pPageDict ? pPageDict->GetDirectObjectFor("Contents") : nullptr; |
| if (pContent) |
| pPageDict->RemoveFor("Contents"); |
| |
| CPDF_Stream* pStream = m_pDocument->NewIndirect<CPDF_Stream>(); |
| pStream->SetData(buf.GetBuffer(), buf.GetLength()); |
| pPageDict->SetNewFor<CPDF_Reference>("Contents", m_pDocument, |
| pStream->GetObjNum()); |
| } |
| |
| CFX_ByteString CPDF_PageContentGenerator::RealizeResource( |
| uint32_t dwResourceObjNum, |
| const CFX_ByteString& bsType) { |
| ASSERT(dwResourceObjNum); |
| if (!m_pPage->m_pResources) { |
| m_pPage->m_pResources = m_pDocument->NewIndirect<CPDF_Dictionary>(); |
| m_pPage->m_pFormDict->SetNewFor<CPDF_Reference>( |
| "Resources", m_pDocument, m_pPage->m_pResources->GetObjNum()); |
| } |
| CPDF_Dictionary* pResList = m_pPage->m_pResources->GetDictFor(bsType); |
| if (!pResList) |
| pResList = m_pPage->m_pResources->SetNewFor<CPDF_Dictionary>(bsType); |
| |
| CFX_ByteString name; |
| int idnum = 1; |
| while (1) { |
| name.Format("FX%c%d", bsType[0], idnum); |
| if (!pResList->KeyExist(name)) { |
| break; |
| } |
| idnum++; |
| } |
| pResList->SetNewFor<CPDF_Reference>(name, m_pDocument, dwResourceObjNum); |
| return name; |
| } |
| |
| void CPDF_PageContentGenerator::ProcessImage(CFX_ByteTextBuf* buf, |
| CPDF_ImageObject* pImageObj) { |
| if ((pImageObj->matrix().a == 0 && pImageObj->matrix().b == 0) || |
| (pImageObj->matrix().c == 0 && pImageObj->matrix().d == 0)) { |
| return; |
| } |
| *buf << "q " << pImageObj->matrix() << " cm "; |
| |
| CPDF_Image* pImage = pImageObj->GetImage(); |
| if (pImage->IsInline()) |
| return; |
| |
| CPDF_Stream* pStream = pImage->GetStream(); |
| if (!pStream) |
| return; |
| |
| bool bWasInline = pStream->IsInline(); |
| if (bWasInline) |
| pImage->ConvertStreamToIndirectObject(); |
| |
| uint32_t dwObjNum = pStream->GetObjNum(); |
| CFX_ByteString name = RealizeResource(dwObjNum, "XObject"); |
| if (bWasInline) |
| pImageObj->SetUnownedImage(m_pDocument->GetPageData()->GetImage(dwObjNum)); |
| |
| *buf << "/" << PDF_NameEncode(name) << " Do Q\n"; |
| } |