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"
12CFX_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}
17CPDF_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    FX_POSITION pos = pPage->GetFirstObjectPosition();
24    while (pos) {
25        InsertPageObject(pPage->GetNextObject(pos));
26    }
27}
28CPDF_PageContentGenerate::~CPDF_PageContentGenerate()
29{
30}
31FX_BOOL CPDF_PageContentGenerate::InsertPageObject(CPDF_PageObject* pPageObject)
32{
33    if (!pPageObject) {
34        return FALSE;
35    }
36    return m_pageObjects.Add(pPageObject);
37}
38void CPDF_PageContentGenerate::GenerateContent()
39{
40    CFX_ByteTextBuf buf;
41    CPDF_Dictionary* pPageDict = m_pPage->m_pFormDict;
42    for (int i = 0; i < m_pageObjects.GetSize(); ++i) {
43        CPDF_PageObject* pPageObj = (CPDF_PageObject*)m_pageObjects[i];
44        if (!pPageObj || pPageObj->m_Type != PDFPAGE_IMAGE) {
45            continue;
46        }
47        ProcessImage(buf, (CPDF_ImageObject*)pPageObj);
48    }
49    CPDF_Object* pContent = pPageDict ? pPageDict->GetElementValue("Contents") : NULL;
50    if (pContent != NULL) {
51        pPageDict->RemoveAt("Contents");
52    }
53    CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
54    pStream->SetData(buf.GetBuffer(), buf.GetLength(), FALSE, FALSE);
55    m_pDocument->AddIndirectObject(pStream);
56    pPageDict->SetAtReference("Contents", m_pDocument, pStream->GetObjNum());
57}
58CFX_ByteString CPDF_PageContentGenerate::RealizeResource(CPDF_Object* pResourceObj, const FX_CHAR* szType)
59{
60    if (m_pPage->m_pResources == NULL) {
61        m_pPage->m_pResources = new CPDF_Dictionary;
62        int objnum = m_pDocument->AddIndirectObject(m_pPage->m_pResources);
63        m_pPage->m_pFormDict->SetAtReference("Resources", m_pDocument, objnum);
64    }
65    CPDF_Dictionary* pResList = m_pPage->m_pResources->GetDict(szType);
66    if (pResList == NULL) {
67        pResList = new CPDF_Dictionary;
68        m_pPage->m_pResources->SetAt(szType, pResList);
69    }
70    m_pDocument->AddIndirectObject(pResourceObj);
71    CFX_ByteString name;
72    int idnum = 1;
73    while (1) {
74        name.Format("FX%c%d", szType[0], idnum);
75        if (!pResList->KeyExist(name)) {
76            break;
77        }
78        idnum ++;
79    }
80    pResList->AddReference(name, m_pDocument, pResourceObj->GetObjNum());
81    return name;
82}
83void CPDF_PageContentGenerate::ProcessImage(CFX_ByteTextBuf& buf, CPDF_ImageObject* pImageObj)
84{
85    if ((pImageObj->m_Matrix.a == 0 && pImageObj->m_Matrix.b == 0) ||
86            (pImageObj->m_Matrix.c == 0 && pImageObj->m_Matrix.d == 0)) {
87        return;
88    }
89    buf << "q " << pImageObj->m_Matrix << " cm ";
90    if (!pImageObj->m_pImage->IsInline()) {
91        CPDF_Stream* pStream = pImageObj->m_pImage->GetStream();
92        FX_DWORD dwSavedObjNum = pStream->GetObjNum();
93        CFX_ByteString name = RealizeResource(pStream, "XObject");
94        if (dwSavedObjNum == 0) {
95            if (pImageObj->m_pImage)
96                pImageObj->m_pImage->Release();
97            pImageObj->m_pImage = m_pDocument->GetPageData()->GetImage(pStream);
98        }
99        buf << "/" << PDF_NameEncode(name) << " Do Q\n";
100    }
101}
102void CPDF_PageContentGenerate::ProcessForm(CFX_ByteTextBuf& buf, FX_LPCBYTE data, FX_DWORD size, CFX_Matrix& matrix)
103{
104    if (!data || !size) {
105        return;
106    }
107    CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
108    CPDF_Dictionary* pFormDict = CPDF_Dictionary::Create();
109    pFormDict->SetAtName(FX_BSTR("Type"), FX_BSTR("XObject"));
110    pFormDict->SetAtName(FX_BSTR("Subtype"), FX_BSTR("Form"));
111    CFX_FloatRect bbox = m_pPage->GetPageBBox();
112    matrix.TransformRect(bbox);
113    pFormDict->SetAtRect(FX_BSTR("BBox"), bbox);
114    pStream->InitStream((FX_LPBYTE)data, size, pFormDict);
115    buf << "q " << matrix << " cm ";
116    CFX_ByteString name = RealizeResource(pStream, "XObject");
117    buf << "/" << PDF_NameEncode(name) << " Do Q\n";
118}
119void CPDF_PageContentGenerate::TransformContent(CFX_Matrix& matrix)
120{
121    CPDF_Dictionary* pDict = m_pPage->m_pFormDict;
122    CPDF_Object* pContent = pDict ? pDict->GetElementValue("Contents") : NULL;
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 = 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 = 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