1 // Copyright 2014 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #include "../../../include/fpdfapi/fpdf_page.h" 8 #include "../../../include/fpdfapi/fpdf_serial.h" 9 #include "../../../include/fpdfapi/fpdf_module.h" 10 #include "../../../include/fxcodec/fx_codec.h" 11 #include "../fpdf_page/pageint.h" 12 CFX_ByteTextBuf& operator << (CFX_ByteTextBuf& ar, CFX_AffineMatrix& matrix) 13 { 14 ar << matrix.a << " " << matrix.b << " " << matrix.c << " " << matrix.d << " " << matrix.e << " " << matrix.f; 15 return ar; 16 } 17 CPDF_PageContentGenerate::CPDF_PageContentGenerate(CPDF_Page* pPage) : m_pPage(pPage) 18 { 19 m_pDocument = NULL; 20 if (m_pPage) { 21 m_pDocument = m_pPage->m_pDocument; 22 } 23 } 24 CPDF_PageContentGenerate::~CPDF_PageContentGenerate() 25 { 26 for (int i = 0; i < m_pageObjects.GetSize(); ++i) { 27 CPDF_PageObject* pPageObj = (CPDF_PageObject*)m_pageObjects[i]; 28 if (pPageObj) { 29 pPageObj->Release(); 30 } 31 } 32 } 33 FX_BOOL CPDF_PageContentGenerate::InsertPageObject(CPDF_PageObject* pPageObject) 34 { 35 if (!pPageObject) { 36 return FALSE; 37 } 38 return m_pageObjects.Add(pPageObject); 39 } 40 void CPDF_PageContentGenerate::GenerateContent() 41 { 42 CFX_ByteTextBuf buf; 43 CPDF_Dictionary* pPageDict = m_pPage->m_pFormDict; 44 for (int i = 0; i < m_pageObjects.GetSize(); ++i) { 45 CPDF_PageObject* pPageObj = (CPDF_PageObject*)m_pageObjects[i]; 46 if (!pPageObj || pPageObj->m_Type != PDFPAGE_IMAGE) { 47 continue; 48 } 49 ProcessImage(buf, (CPDF_ImageObject*)pPageObj); 50 } 51 CPDF_Object* pContent = pPageDict->GetElementValue("Contents"); 52 if (pContent != NULL) { 53 pPageDict->RemoveAt("Contents"); 54 } 55 CPDF_Stream* pStream = FX_NEW CPDF_Stream(NULL, 0, NULL); 56 pStream->SetData(buf.GetBuffer(), buf.GetLength(), FALSE, FALSE); 57 m_pDocument->AddIndirectObject(pStream); 58 pPageDict->SetAtReference("Contents", m_pDocument, pStream->GetObjNum()); 59 } 60 CFX_ByteString CPDF_PageContentGenerate::RealizeResource(CPDF_Object* pResourceObj, const FX_CHAR* szType) 61 { 62 if (m_pPage->m_pResources == NULL) { 63 m_pPage->m_pResources = FX_NEW CPDF_Dictionary; 64 int objnum = m_pDocument->AddIndirectObject(m_pPage->m_pResources); 65 m_pPage->m_pFormDict->SetAtReference("Resources", m_pDocument, objnum); 66 } 67 CPDF_Dictionary* pResList = m_pPage->m_pResources->GetDict(szType); 68 if (pResList == NULL) { 69 pResList = FX_NEW CPDF_Dictionary; 70 m_pPage->m_pResources->SetAt(szType, pResList); 71 } 72 m_pDocument->AddIndirectObject(pResourceObj); 73 CFX_ByteString name; 74 int idnum = 1; 75 while (1) { 76 name.Format("FX%c%d", szType[0], idnum); 77 if (!pResList->KeyExist(name)) { 78 break; 79 } 80 idnum ++; 81 } 82 pResList->AddReference(name, m_pDocument, pResourceObj->GetObjNum()); 83 return name; 84 } 85 void CPDF_PageContentGenerate::ProcessImage(CFX_ByteTextBuf& buf, CPDF_ImageObject* pImageObj) 86 { 87 if ((pImageObj->m_Matrix.a == 0 && pImageObj->m_Matrix.b == 0) || 88 (pImageObj->m_Matrix.c == 0 && pImageObj->m_Matrix.d == 0)) { 89 return; 90 } 91 buf << "q " << pImageObj->m_Matrix << " cm "; 92 if (!pImageObj->m_pImage->IsInline()) { 93 CPDF_Stream* pStream = pImageObj->m_pImage->GetStream(); 94 FX_DWORD dwSavedObjNum = pStream->GetObjNum(); 95 CFX_ByteString name = RealizeResource(pStream, "XObject"); 96 if (dwSavedObjNum == 0) { 97 pImageObj->m_pImage->Release(); 98 pImageObj->m_pImage = m_pDocument->GetPageData()->GetImage(pStream); 99 } 100 buf << "/" << PDF_NameEncode(name) << " Do Q\n"; 101 } 102 } 103 void CPDF_PageContentGenerate::ProcessForm(CFX_ByteTextBuf& buf, FX_LPCBYTE data, FX_DWORD size, CFX_Matrix& matrix) 104 { 105 if (!data || !size) { 106 return; 107 } 108 CPDF_Stream* pStream = FX_NEW CPDF_Stream(NULL, 0, NULL); 109 CPDF_Dictionary* pFormDict = CPDF_Dictionary::Create(); 110 pFormDict->SetAtName(FX_BSTR("Type"), FX_BSTR("XObject")); 111 pFormDict->SetAtName(FX_BSTR("Subtype"), FX_BSTR("Form")); 112 CFX_FloatRect bbox = m_pPage->GetPageBBox(); 113 matrix.TransformRect(bbox); 114 pFormDict->SetAtRect(FX_BSTR("BBox"), bbox); 115 pStream->InitStream((FX_LPBYTE)data, size, pFormDict); 116 buf << "q " << matrix << " cm "; 117 CFX_ByteString name = RealizeResource(pStream, "XObject"); 118 buf << "/" << PDF_NameEncode(name) << " Do Q\n"; 119 } 120 void CPDF_PageContentGenerate::TransformContent(CFX_Matrix& matrix) 121 { 122 CPDF_Object* pContent = m_pPage->m_pFormDict->GetElementValue("Contents"); 123 if (!pContent) { 124 return; 125 } 126 CFX_ByteTextBuf buf; 127 int type = pContent->GetType(); 128 if (type == PDFOBJ_ARRAY) { 129 CPDF_Array* pArray = (CPDF_Array*)pContent; 130 int iCount = pArray->GetCount(); 131 CPDF_StreamAcc** pContentArray = (CPDF_StreamAcc**)FX_Alloc(CPDF_StreamAcc*, iCount); 132 int size = 0; 133 int i = 0; 134 for (i = 0; i < iCount; ++i) { 135 pContent = pArray->GetElement(i); 136 if (!pContent || pContent->GetType() != PDFOBJ_STREAM) { 137 continue; 138 } 139 CPDF_StreamAcc* pStream = FX_NEW CPDF_StreamAcc(); 140 pStream->LoadAllData((CPDF_Stream*)pContent); 141 pContentArray[i] = pStream; 142 size += pContentArray[i]->GetSize() + 1; 143 } 144 int pos = 0; 145 FX_LPBYTE pBuf = FX_Alloc(FX_BYTE, size); 146 for (i = 0; i < iCount; ++i) { 147 FXSYS_memcpy32(pBuf + pos, pContentArray[i]->GetData(), pContentArray[i]->GetSize()); 148 pos += pContentArray[i]->GetSize() + 1; 149 pBuf[pos - 1] = ' '; 150 delete pContentArray[i]; 151 } 152 ProcessForm(buf, pBuf, size, matrix); 153 FX_Free(pBuf); 154 FX_Free(pContentArray); 155 } else if (type == PDFOBJ_STREAM) { 156 CPDF_StreamAcc contentStream; 157 contentStream.LoadAllData((CPDF_Stream*)pContent); 158 ProcessForm(buf, contentStream.GetData(), contentStream.GetSize(), matrix); 159 } 160 CPDF_Stream* pStream = FX_NEW CPDF_Stream(NULL, 0, NULL); 161 pStream->SetData(buf.GetBuffer(), buf.GetLength(), FALSE, FALSE); 162 m_pDocument->AddIndirectObject(pStream); 163 m_pPage->m_pFormDict->SetAtReference("Contents", m_pDocument, pStream->GetObjNum()); 164 } 165
