fpdfsdk/src/fpdf_flatten.cpp - pdfium - Git at Google

 // 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;
 }
	// 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;
	}