diff options
Diffstat (limited to 'fpdfsdk/src/fpdf_flatten.cpp')
| -rw-r--r-- | fpdfsdk/src/fpdf_flatten.cpp | 561 |
1 files changed, 561 insertions, 0 deletions
diff --git a/fpdfsdk/src/fpdf_flatten.cpp b/fpdfsdk/src/fpdf_flatten.cpp new file mode 100644 index 0000000000..f04100f95a --- /dev/null +++ b/fpdfsdk/src/fpdf_flatten.cpp @@ -0,0 +1,561 @@ +// 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 "../include/fsdk_define.h"
+#include "../include/fpdf_flatten.h"
+
+typedef CFX_ArrayTemplate<CPDF_Dictionary*> CPDF_ObjectArray;
+typedef CFX_ArrayTemplate<CPDF_Rect> CPDF_RectArray;
+
+enum FPDF_TYPE { MAX, MIN };
+enum FPDF_VALUE { TOP, LEFT, RIGHT, BOTTOM };
+
+FX_BOOL IsValiableRect(CPDF_Rect rect, CPDF_Rect rcPage)
+{
+ if ( rect.left - rect.right > 0.000001f ||
+ rect.bottom - rect.top > 0.000001f)
+ return FALSE;
+
+ if (rect.left == 0.0f &&
+ rect.top == 0.0f &&
+ rect.right == 0.0f &&
+ rect.bottom == 0.0f)
+ return FALSE;
+
+ if (!rcPage.IsEmpty())
+ {
+ if (rect.left - rcPage.left < -10.000001f ||
+ rect.right - rcPage.right > 10.000001f ||
+ rect.top - rcPage.top > 10.000001f ||
+ rect.bottom - rcPage.bottom < -10.000001f)
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+
+FX_BOOL GetContentsRect( CPDF_Document * pDoc, CPDF_Dictionary* pDict, CPDF_RectArray * pRectArray )
+{
+ CPDF_Page* pPDFPage = FX_NEW CPDF_Page;
+ pPDFPage->Load( pDoc, pDict, FALSE );
+ pPDFPage->ParseContent();
+
+ FX_POSITION pos = pPDFPage->GetFirstObjectPosition();
+
+ while (pos)
+ {
+ CPDF_PageObject* pPageObject = pPDFPage->GetNextObject(pos);
+ if (!pPageObject)continue;
+
+ CPDF_Rect rc;
+ rc.left = pPageObject->m_Left;
+ rc.right = pPageObject->m_Right;
+ rc.bottom = pPageObject->m_Bottom;
+ rc.top = pPageObject->m_Top;
+
+ if (IsValiableRect(rc, pDict->GetRect("MediaBox")))
+ {
+ pRectArray->Add(rc);
+ }
+ }
+
+ delete pPDFPage;
+ return TRUE;
+}
+
+
+void ParserStream( CPDF_Dictionary * pPageDic, CPDF_Dictionary* pStream, CPDF_RectArray * pRectArray, CPDF_ObjectArray * pObjectArray )
+{
+ if (!pStream)return;
+ CPDF_Rect rect;
+ if (pStream->KeyExist("Rect"))
+ rect = pStream->GetRect("Rect");
+ else if (pStream->KeyExist("BBox"))
+ rect = pStream->GetRect("BBox");
+
+ if (IsValiableRect(rect, pPageDic->GetRect("MediaBox")))
+ pRectArray->Add(rect);
+
+ pObjectArray->Add(pStream);
+}
+
+
+int ParserAnnots( CPDF_Document* pSourceDoc, CPDF_Dictionary * pPageDic, CPDF_RectArray * pRectArray, CPDF_ObjectArray * pObjectArray, int nUsage)
+{
+ if (!pSourceDoc || !pPageDic) return FLATTEN_FAIL;
+
+ GetContentsRect( pSourceDoc, pPageDic, pRectArray );
+ CPDF_Array* pAnnots = pPageDic->GetArray("Annots");
+ if (pAnnots)
+ {
+ FX_DWORD dwSize = pAnnots->GetCount();
+
+ for (int i = 0; i < (int)dwSize; i++)
+ {
+ CPDF_Object* pObj = pAnnots->GetElementValue(i);
+
+ if (!pObj)continue;
+
+ if (pObj->GetType() == PDFOBJ_DICTIONARY)
+ {
+ CPDF_Dictionary* pAnnotDic = (CPDF_Dictionary*)pObj;
+ CFX_ByteString sSubtype = pAnnotDic->GetString("Subtype");
+ if (sSubtype == "Popup")continue;
+
+ int nAnnotFlag = pAnnotDic->GetInteger("F");
+
+ if(nAnnotFlag & ANNOTFLAG_HIDDEN)
+ continue;
+ if(nUsage == FLAT_NORMALDISPLAY)
+ {
+ if(nAnnotFlag & ANNOTFLAG_INVISIBLE)
+ continue;
+ ParserStream( pPageDic, pAnnotDic, pRectArray, pObjectArray );
+ }
+ else
+ {
+ if(nAnnotFlag & ANNOTFLAG_PRINT)
+ ParserStream( pPageDic, pAnnotDic, pRectArray, pObjectArray );
+ }
+ }
+ }
+ return FLATTEN_SUCCESS;
+ }else{
+ return FLATTEN_NOTINGTODO;
+ }
+}
+
+
+FX_FLOAT GetMinMaxValue( CPDF_RectArray& array, FPDF_TYPE type, FPDF_VALUE value)
+{
+ int nRects = array.GetSize();
+ FX_FLOAT fRet = 0.0f;
+
+ if (nRects <= 0)return 0.0f;
+
+ FX_FLOAT* pArray = new FX_FLOAT[nRects];
+ switch(value)
+ {
+ case LEFT:
+ {
+ for (int i = 0; i < nRects; i++)
+ pArray[i] = CPDF_Rect(array.GetAt(i)).left;
+
+ break;
+ }
+ case TOP:
+ {
+ for (int i = 0; i < nRects; i++)
+ pArray[i] = CPDF_Rect(array.GetAt(i)).top;
+
+ break;
+ }
+ case RIGHT:
+ {
+ for (int i = 0; i < nRects; i++)
+ pArray[i] = CPDF_Rect(array.GetAt(i)).right;
+
+ break;
+ }
+ case BOTTOM:
+ {
+ for (int i = 0; i < nRects; i++)
+ pArray[i] = CPDF_Rect(array.GetAt(i)).bottom;
+
+ break;
+ }
+ default:
+ break;
+ }
+ fRet = pArray[0];
+ if (type == MAX)
+ {
+ for (int i = 1; i < nRects; i++)
+ if (fRet <= pArray[i])
+ fRet = pArray[i];
+ }
+ else
+ {
+ for (int i = 1; i < nRects; i++)
+ if (fRet >= pArray[i])
+ fRet = pArray[i];
+ }
+ delete[] pArray;
+ return fRet;
+}
+
+CPDF_Rect CalculateRect( CPDF_RectArray * pRectArray )
+{
+
+ CPDF_Rect rcRet;
+
+ rcRet.left = GetMinMaxValue(*pRectArray, MIN, LEFT);
+ rcRet.top = GetMinMaxValue(*pRectArray, MAX, TOP);
+ rcRet.right = GetMinMaxValue(*pRectArray, MAX, RIGHT);
+ rcRet.bottom = GetMinMaxValue(*pRectArray, MIN, BOTTOM);
+
+ return rcRet;
+}
+
+
+void SetPageContents(CFX_ByteString key, CPDF_Dictionary* pPage, CPDF_Document* pDocument)
+{
+ CPDF_Object* pContentsObj = pPage->GetStream("Contents");
+ if (!pContentsObj)
+ {
+ pContentsObj = pPage->GetArray("Contents");
+ }
+
+ if (!pContentsObj)
+ {
+ //Create a new contents dictionary
+ if (!key.IsEmpty())
+ {
+ CPDF_Stream* pNewContents = FX_NEW CPDF_Stream(NULL, 0, FX_NEW CPDF_Dictionary);
+ if (!pNewContents)return;
+ pPage->SetAtReference("Contents", pDocument, pDocument->AddIndirectObject(pNewContents));
+
+ CFX_ByteString sStream;
+ sStream.Format("q 1 0 0 1 0 0 cm /%s Do Q", (FX_LPCSTR)key);
+ pNewContents->SetData((FX_LPCBYTE)sStream, sStream.GetLength(), FALSE, FALSE);
+ }
+ return;
+ }
+
+ int iType = pContentsObj->GetType();
+ CPDF_Array* pContentsArray = NULL;
+
+ switch(iType)
+ {
+ case PDFOBJ_STREAM:
+ {
+ pContentsArray = FX_NEW CPDF_Array;
+ CPDF_Stream* pContents = (CPDF_Stream*)pContentsObj;
+ FX_DWORD dwObjNum = pDocument->AddIndirectObject(pContents);
+ CPDF_StreamAcc acc;
+ acc.LoadAllData(pContents);
+ CFX_ByteString sStream = "q\n";
+ CFX_ByteString sBody = CFX_ByteString((FX_LPCSTR)acc.GetData(), acc.GetSize());
+ sStream = sStream + sBody + "\nQ";
+ pContents->SetData((FX_LPCBYTE)sStream, sStream.GetLength(), FALSE, FALSE);
+ pContentsArray->AddReference(pDocument, dwObjNum);
+ break;
+ }
+
+ case PDFOBJ_ARRAY:
+ {
+ pContentsArray = (CPDF_Array*)pContentsObj;
+ break;
+ }
+ default:
+ break;
+ }
+
+ if (!pContentsArray)return;
+
+ FX_DWORD dwObjNum = pDocument->AddIndirectObject(pContentsArray);
+ pPage->SetAtReference("Contents", pDocument, dwObjNum);
+
+ if (!key.IsEmpty())
+ {
+ CPDF_Stream* pNewContents = FX_NEW CPDF_Stream(NULL, 0, FX_NEW CPDF_Dictionary);
+ dwObjNum = pDocument->AddIndirectObject(pNewContents);
+ pContentsArray->AddReference(pDocument, dwObjNum);
+
+ CFX_ByteString sStream;
+ sStream.Format("q 1 0 0 1 0 0 cm /%s Do Q", (FX_LPCSTR)key);
+ pNewContents->SetData((FX_LPCBYTE)sStream, sStream.GetLength(), FALSE, FALSE);
+ }
+}
+
+CFX_AffineMatrix GetMatrix(CPDF_Rect rcAnnot, CPDF_Rect rcStream, CFX_AffineMatrix matrix)
+{
+ if(rcStream.IsEmpty())
+ return CFX_AffineMatrix();
+
+ matrix.TransformRect(rcStream);
+ rcStream.Normalize();
+
+ FX_FLOAT a = rcAnnot.Width()/rcStream.Width();
+ FX_FLOAT d = rcAnnot.Height()/rcStream.Height();
+
+ FX_FLOAT e = rcAnnot.left - rcStream.left * a;
+ FX_FLOAT f = rcAnnot.bottom - rcStream.bottom * d;
+ return CFX_AffineMatrix(a, 0, 0, d, e, f);
+}
+
+void GetOffset(FX_FLOAT& fa, FX_FLOAT& fd, FX_FLOAT& fe, FX_FLOAT& ff, CPDF_Rect rcAnnot, CPDF_Rect rcStream, CFX_AffineMatrix matrix)
+{
+ FX_FLOAT fStreamWidth = 0.0f;
+ FX_FLOAT fStreamHeight = 0.0f;
+
+
+
+ if (matrix.a != 0 && matrix.d != 0)
+ {
+ fStreamWidth = rcStream.right - rcStream.left;
+ fStreamHeight = rcStream.top - rcStream.bottom;
+ }
+ else
+ {
+ fStreamWidth = rcStream.top - rcStream.bottom;
+ fStreamHeight = rcStream.right - rcStream.left;
+ }
+
+ FX_FLOAT x1 = matrix.a * rcStream.left + matrix.c * rcStream.bottom + matrix.e;
+ FX_FLOAT y1 = matrix.b * rcStream.left + matrix.d * rcStream.bottom + matrix.f;
+ FX_FLOAT x2 = matrix.a * rcStream.left + matrix.c * rcStream.top + matrix.e;
+ FX_FLOAT y2 = matrix.b * rcStream.left + matrix.d * rcStream.top + matrix.f;
+ FX_FLOAT x3 = matrix.a * rcStream.right + matrix.c * rcStream.bottom + matrix.e;
+ FX_FLOAT y3 = matrix.b * rcStream.right + matrix.d * rcStream.bottom + matrix.f;
+ FX_FLOAT x4 = matrix.a * rcStream.right + matrix.c * rcStream.top + matrix.e;
+ FX_FLOAT y4 = matrix.b * rcStream.right + matrix.d * rcStream.top + matrix.f;
+
+ FX_FLOAT left = FX_MIN(FX_MIN(x1, x2), FX_MIN(x3, x4));
+ FX_FLOAT bottom = FX_MIN(FX_MIN(y1, y2), FX_MIN(y3, y4));
+
+ fa = (rcAnnot.right - rcAnnot.left)/fStreamWidth;
+ fd = (rcAnnot.top - rcAnnot.bottom)/fStreamHeight;
+ fe = rcAnnot.left - left * fa;
+ ff = rcAnnot.bottom - bottom * fd;
+}
+
+
+DLLEXPORT int STDCALL FPDFPage_Flatten( FPDF_PAGE page, int nFlag)
+{
+ if (!page)
+ {
+ return FLATTEN_FAIL;
+ }
+
+ CPDF_Page * pPage = (CPDF_Page*)( page );
+ CPDF_Document * pDocument = pPage->m_pDocument;
+ CPDF_Dictionary * pPageDict = pPage->m_pFormDict;
+
+ if ( !pDocument || !pPageDict )
+ {
+ return FLATTEN_FAIL;
+ }
+
+ CPDF_ObjectArray ObjectArray;
+ CPDF_RectArray RectArray;
+
+ int iRet = FLATTEN_FAIL;
+ iRet = ParserAnnots( pDocument, pPageDict, &RectArray, &ObjectArray, nFlag);
+ if (iRet == FLATTEN_NOTINGTODO)
+ {
+ return FLATTEN_NOTINGTODO;
+ }else if (iRet == FLATTEN_FAIL)
+ {
+ return FLATTEN_FAIL;
+ }
+
+ CPDF_Rect rcOriginalCB;
+ CPDF_Rect rcMerger = CalculateRect( &RectArray );
+ CPDF_Rect rcOriginalMB = pPageDict->GetRect("MediaBox");
+
+ if (pPageDict->KeyExist("CropBox"))
+ rcOriginalMB = pPageDict->GetRect("CropBox");
+
+ if (rcOriginalMB.IsEmpty())
+ {
+ rcOriginalMB = CPDF_Rect(0.0f, 0.0f, 612.0f, 792.0f);
+ }
+
+ rcMerger.left = rcMerger.left < rcOriginalMB.left? rcOriginalMB.left : rcMerger.left;
+ rcMerger.right = rcMerger.right > rcOriginalMB.right? rcOriginalMB.right : rcMerger.right;
+ rcMerger.top = rcMerger.top > rcOriginalMB.top? rcOriginalMB.top : rcMerger.top;
+ rcMerger.bottom = rcMerger.bottom < rcOriginalMB.bottom? rcOriginalMB.bottom : rcMerger.bottom;
+
+ if (pPageDict->KeyExist("ArtBox"))
+ rcOriginalCB = pPageDict->GetRect("ArtBox");
+ else
+ rcOriginalCB = rcOriginalMB;
+
+ if (!rcOriginalMB.IsEmpty())
+ {
+ CPDF_Array* pMediaBox = FX_NEW CPDF_Array();
+
+ pMediaBox->Add(FX_NEW CPDF_Number(rcOriginalMB.left));
+ pMediaBox->Add(FX_NEW CPDF_Number(rcOriginalMB.bottom));
+ pMediaBox->Add(FX_NEW CPDF_Number(rcOriginalMB.right));
+ pMediaBox->Add(FX_NEW CPDF_Number(rcOriginalMB.top));
+
+ pPageDict->SetAt("MediaBox",pMediaBox);
+ }
+
+ if (!rcOriginalCB.IsEmpty())
+ {
+ CPDF_Array* pCropBox = FX_NEW CPDF_Array();
+ pCropBox->Add(FX_NEW CPDF_Number(rcOriginalCB.left));
+ pCropBox->Add(FX_NEW CPDF_Number(rcOriginalCB.bottom));
+ pCropBox->Add(FX_NEW CPDF_Number(rcOriginalCB.right));
+ pCropBox->Add(FX_NEW CPDF_Number(rcOriginalCB.top));
+ pPageDict->SetAt("ArtBox", pCropBox);
+ }
+
+ CPDF_Dictionary* pRes = NULL;
+ pRes = pPageDict->GetDict("Resources");
+ if (!pRes)
+ {
+ pRes = FX_NEW CPDF_Dictionary;
+ pPageDict->SetAt( "Resources", pRes );
+ }
+
+ CPDF_Stream* pNewXObject = FX_NEW CPDF_Stream(NULL, 0, FX_NEW CPDF_Dictionary);
+ FX_DWORD dwObjNum = pDocument->AddIndirectObject(pNewXObject);
+ CPDF_Dictionary* pPageXObject = pRes->GetDict("XObject");
+ if (!pPageXObject)
+ {
+ pPageXObject = FX_NEW CPDF_Dictionary;
+ pRes->SetAt("XObject", pPageXObject);
+ }
+
+ CFX_ByteString key = "";
+ int nStreams = ObjectArray.GetSize();
+
+ if (nStreams > 0)
+ {
+ for (int iKey = 0; /*iKey < 100*/; iKey++)
+ {
+ char sExtend[5] = {0};
+ FXSYS_itoa(iKey, sExtend, 10);
+ key = CFX_ByteString("FFT") + CFX_ByteString(sExtend);
+
+ if (!pPageXObject->KeyExist(key))
+ break;
+ }
+ }
+
+ SetPageContents(key, pPageDict, pDocument);
+
+ CPDF_Dictionary* pNewXORes = NULL;
+
+ if (!key.IsEmpty())
+ {
+ pPageXObject->SetAtReference(key, pDocument, dwObjNum);
+ CPDF_Dictionary* pNewOXbjectDic = pNewXObject->GetDict();
+ pNewXORes = FX_NEW CPDF_Dictionary;
+ pNewOXbjectDic->SetAt("Resources", pNewXORes);
+ pNewOXbjectDic->SetAtName("Type", "XObject");
+ pNewOXbjectDic->SetAtName("Subtype", "Form");
+ pNewOXbjectDic->SetAtInteger("FormType", 1);
+ pNewOXbjectDic->SetAtName("Name", "FRM");
+ CPDF_Rect rcBBox = pPageDict->GetRect("ArtBox");
+ pNewOXbjectDic->SetAtRect("BBox", rcBBox);
+ }
+
+ for (int i = 0; i < nStreams; i++)
+ {
+ CPDF_Dictionary* pAnnotDic = ObjectArray.GetAt(i);
+ if (!pAnnotDic)continue;
+
+ CPDF_Rect rcAnnot = pAnnotDic->GetRect("Rect");
+ rcAnnot.Normalize();
+
+ CFX_ByteString sAnnotState = pAnnotDic->GetString("AS");
+ CPDF_Dictionary* pAnnotAP = pAnnotDic->GetDict("AP");
+ if (!pAnnotAP)continue;
+
+ CPDF_Stream* pAPStream = pAnnotAP->GetStream("N");
+ if (!pAPStream)
+ {
+ CPDF_Dictionary* pAPDic = pAnnotAP->GetDict("N");
+ if (!pAPDic)continue;
+
+ if (!sAnnotState.IsEmpty())
+ {
+ pAPStream = pAPDic->GetStream(sAnnotState);
+ }
+ else
+ {
+ FX_POSITION pos = pAPDic->GetStartPos();
+ if (pos)
+ {
+ CFX_ByteString sKey;
+ CPDF_Object* pFirstObj = pAPDic->GetNextElement(pos, sKey);
+ if (pFirstObj)
+ {
+ if (pFirstObj->GetType() == PDFOBJ_REFERENCE)
+ pFirstObj = pFirstObj->GetDirect();
+
+ if (pFirstObj->GetType() != PDFOBJ_STREAM)
+ continue;
+
+ pAPStream = (CPDF_Stream*)pFirstObj;
+ }
+ }
+ }
+ }
+
+ if (!pAPStream)continue;
+
+ CPDF_Dictionary* pAPDic = pAPStream->GetDict();
+ CFX_AffineMatrix matrix = pAPDic->GetMatrix("Matrix");
+
+ CPDF_Rect rcStream;
+ if (pAPDic->KeyExist("Rect"))
+ rcStream = pAPDic->GetRect("Rect");
+ else if (pAPDic->KeyExist("BBox"))
+ rcStream = pAPDic->GetRect("BBox");
+
+ if (rcStream.IsEmpty())continue;
+
+ CPDF_Object* pObj = pAPStream;
+
+ if (pObj)
+ {
+ CPDF_Dictionary* pObjDic = pObj->GetDict();
+ if (pObjDic)
+ {
+ pObjDic->SetAtName("Type", "XObject");
+ pObjDic->SetAtName("Subtype", "Form");
+ }
+ }
+
+ CPDF_Dictionary* pXObject = pNewXORes->GetDict("XObject");
+ if (!pXObject)
+ {
+ pXObject = FX_NEW CPDF_Dictionary;
+ pNewXORes->SetAt("XObject", pXObject);
+ }
+
+ CFX_ByteString sFormName;
+ sFormName.Format("F%d", i);
+ FX_DWORD dwObjNum = pDocument->AddIndirectObject(pObj);
+ pXObject->SetAtReference(sFormName, pDocument, dwObjNum);
+
+ CPDF_StreamAcc acc;
+ acc.LoadAllData(pNewXObject);
+
+ FX_LPCBYTE pData = acc.GetData();
+ CFX_ByteString sStream(pData, acc.GetSize());
+ CFX_ByteString sTemp;
+
+ if (matrix.IsIdentity())
+ {
+ matrix.a = 1.0f;
+ matrix.b = 0.0f;
+ matrix.c = 0.0f;
+ matrix.d = 1.0f;
+ matrix.e = 0.0f;
+ matrix.f = 0.0f;
+ }
+
+ CFX_AffineMatrix m = GetMatrix(rcAnnot, rcStream, matrix);
+ sTemp.Format("q %f 0 0 %f %f %f cm /%s Do Q\n", m.a, m.d, m.e, m.f, (FX_LPCSTR)sFormName);
+ sStream += sTemp;
+
+ pNewXObject->SetData((FX_LPCBYTE)sStream, sStream.GetLength(), FALSE, FALSE);
+ }
+ pPageDict->RemoveAt( "Annots" );
+
+ ObjectArray.RemoveAll();
+ RectArray.RemoveAll();
+
+ return FLATTEN_SUCCESS;
+}
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