| // 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 "public/fpdf_flatten.h" |
| |
| #include <algorithm> |
| #include <memory> |
| #include <utility> |
| #include <vector> |
| |
| #include "constants/page_object.h" |
| #include "core/fpdfapi/page/cpdf_page.h" |
| #include "core/fpdfapi/page/cpdf_pageobject.h" |
| #include "core/fpdfapi/parser/cpdf_array.h" |
| #include "core/fpdfapi/parser/cpdf_document.h" |
| #include "core/fpdfapi/parser/cpdf_name.h" |
| #include "core/fpdfapi/parser/cpdf_number.h" |
| #include "core/fpdfapi/parser/cpdf_reference.h" |
| #include "core/fpdfapi/parser/cpdf_stream.h" |
| #include "core/fpdfapi/parser/cpdf_stream_acc.h" |
| #include "core/fpdfdoc/cpdf_annot.h" |
| #include "fpdfsdk/cpdfsdk_helpers.h" |
| #include "third_party/base/stl_util.h" |
| |
| enum FPDF_TYPE { MAX, MIN }; |
| enum FPDF_VALUE { TOP, LEFT, RIGHT, BOTTOM }; |
| |
| namespace { |
| |
| bool IsValidRect(const CFX_FloatRect& rect, const CFX_FloatRect& rcPage) { |
| constexpr float kMinSize = 0.000001f; |
| if (rect.IsEmpty() || rect.Width() < kMinSize || rect.Height() < kMinSize) |
| return false; |
| |
| if (rcPage.IsEmpty()) |
| return true; |
| |
| constexpr float kMinBorderSize = 10.000001f; |
| return rect.left - rcPage.left >= -kMinBorderSize && |
| rect.right - rcPage.right <= kMinBorderSize && |
| rect.top - rcPage.top <= kMinBorderSize && |
| rect.bottom - rcPage.bottom >= -kMinBorderSize; |
| } |
| |
| void GetContentsRect(CPDF_Document* pDoc, |
| CPDF_Dictionary* pDict, |
| std::vector<CFX_FloatRect>* pRectArray) { |
| auto pPDFPage = pdfium::MakeRetain<CPDF_Page>(pDoc, pDict, false); |
| pPDFPage->ParseContent(); |
| |
| for (const auto& pPageObject : *pPDFPage->GetPageObjectList()) { |
| CFX_FloatRect rc; |
| rc.left = pPageObject->m_Left; |
| rc.right = pPageObject->m_Right; |
| rc.bottom = pPageObject->m_Bottom; |
| rc.top = pPageObject->m_Top; |
| if (IsValidRect(rc, pDict->GetRectFor(pdfium::page_object::kMediaBox))) |
| pRectArray->push_back(rc); |
| } |
| } |
| |
| void ParserStream(CPDF_Dictionary* pPageDic, |
| CPDF_Dictionary* pStream, |
| std::vector<CFX_FloatRect>* pRectArray, |
| std::vector<CPDF_Dictionary*>* pObjectArray) { |
| if (!pStream) |
| return; |
| CFX_FloatRect rect; |
| if (pStream->KeyExist("Rect")) |
| rect = pStream->GetRectFor("Rect"); |
| else if (pStream->KeyExist("BBox")) |
| rect = pStream->GetRectFor("BBox"); |
| |
| if (IsValidRect(rect, pPageDic->GetRectFor(pdfium::page_object::kMediaBox))) |
| pRectArray->push_back(rect); |
| |
| pObjectArray->push_back(pStream); |
| } |
| |
| int ParserAnnots(CPDF_Document* pSourceDoc, |
| CPDF_Dictionary* pPageDic, |
| std::vector<CFX_FloatRect>* pRectArray, |
| std::vector<CPDF_Dictionary*>* pObjectArray, |
| int nUsage) { |
| if (!pSourceDoc || !pPageDic) |
| return FLATTEN_FAIL; |
| |
| GetContentsRect(pSourceDoc, pPageDic, pRectArray); |
| CPDF_Array* pAnnots = pPageDic->GetArrayFor("Annots"); |
| if (!pAnnots) |
| return FLATTEN_NOTHINGTODO; |
| |
| for (const auto& pAnnot : *pAnnots) { |
| CPDF_Dictionary* pAnnotDic = ToDictionary(pAnnot->GetDirect()); |
| if (!pAnnotDic) |
| continue; |
| |
| ByteString sSubtype = pAnnotDic->GetStringFor("Subtype"); |
| if (sSubtype == "Popup") |
| continue; |
| |
| int nAnnotFlag = pAnnotDic->GetIntegerFor("F"); |
| if (nAnnotFlag & ANNOTFLAG_HIDDEN) |
| continue; |
| |
| bool bParseStream; |
| if (nUsage == FLAT_NORMALDISPLAY) |
| bParseStream = !(nAnnotFlag & ANNOTFLAG_INVISIBLE); |
| else |
| bParseStream = !!(nAnnotFlag & ANNOTFLAG_PRINT); |
| if (bParseStream) |
| ParserStream(pPageDic, pAnnotDic, pRectArray, pObjectArray); |
| } |
| return FLATTEN_SUCCESS; |
| } |
| |
| float GetMinMaxValue(const std::vector<CFX_FloatRect>& array, |
| FPDF_TYPE type, |
| FPDF_VALUE value) { |
| if (array.empty()) |
| return 0.0f; |
| |
| size_t nRects = array.size(); |
| std::vector<float> pArray(nRects); |
| switch (value) { |
| case LEFT: |
| for (size_t i = 0; i < nRects; i++) |
| pArray[i] = array[i].left; |
| break; |
| case TOP: |
| for (size_t i = 0; i < nRects; i++) |
| pArray[i] = array[i].top; |
| break; |
| case RIGHT: |
| for (size_t i = 0; i < nRects; i++) |
| pArray[i] = array[i].right; |
| break; |
| case BOTTOM: |
| for (size_t i = 0; i < nRects; i++) |
| pArray[i] = array[i].bottom; |
| break; |
| default: |
| NOTREACHED(); |
| return 0.0f; |
| } |
| |
| float fRet = pArray[0]; |
| if (type == MAX) { |
| for (size_t i = 1; i < nRects; i++) |
| fRet = std::max(fRet, pArray[i]); |
| } else { |
| for (size_t i = 1; i < nRects; i++) |
| fRet = std::min(fRet, pArray[i]); |
| } |
| return fRet; |
| } |
| |
| CFX_FloatRect CalculateRect(std::vector<CFX_FloatRect>* pRectArray) { |
| CFX_FloatRect 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; |
| } |
| |
| CPDF_Object* NewIndirectContentsStream(const ByteString& key, |
| CPDF_Document* pDocument) { |
| CPDF_Stream* pNewContents = pDocument->NewIndirect<CPDF_Stream>( |
| nullptr, 0, |
| pdfium::MakeUnique<CPDF_Dictionary>(pDocument->GetByteStringPool())); |
| ByteString sStream = |
| ByteString::Format("q 1 0 0 1 0 0 cm /%s Do Q", key.c_str()); |
| pNewContents->SetData(sStream.AsRawSpan()); |
| return pNewContents; |
| } |
| |
| void SetPageContents(const ByteString& key, |
| CPDF_Dictionary* pPage, |
| CPDF_Document* pDocument) { |
| CPDF_Array* pContentsArray = nullptr; |
| CPDF_Stream* pContentsStream = |
| pPage->GetStreamFor(pdfium::page_object::kContents); |
| if (!pContentsStream) { |
| pContentsArray = pPage->GetArrayFor(pdfium::page_object::kContents); |
| if (!pContentsArray) { |
| if (!key.IsEmpty()) { |
| pPage->SetFor(pdfium::page_object::kContents, |
| NewIndirectContentsStream(key, pDocument) |
| ->MakeReference(pDocument)); |
| } |
| return; |
| } |
| } |
| pPage->ConvertToIndirectObjectFor(pdfium::page_object::kContents, pDocument); |
| if (!pContentsArray) { |
| pContentsArray = pDocument->NewIndirect<CPDF_Array>(); |
| auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pContentsStream); |
| pAcc->LoadAllDataFiltered(); |
| ByteString sStream = "q\n"; |
| ByteString sBody = ByteString(pAcc->GetData(), pAcc->GetSize()); |
| sStream = sStream + sBody + "\nQ"; |
| pContentsStream->SetDataAndRemoveFilter(sStream.AsRawSpan()); |
| pContentsArray->Add(pContentsStream->MakeReference(pDocument)); |
| pPage->SetFor(pdfium::page_object::kContents, |
| pContentsArray->MakeReference(pDocument)); |
| } |
| if (!key.IsEmpty()) { |
| pContentsArray->Add( |
| NewIndirectContentsStream(key, pDocument)->MakeReference(pDocument)); |
| } |
| } |
| |
| CFX_Matrix GetMatrix(CFX_FloatRect rcAnnot, |
| CFX_FloatRect rcStream, |
| const CFX_Matrix& matrix) { |
| if (rcStream.IsEmpty()) |
| return CFX_Matrix(); |
| |
| rcStream = matrix.TransformRect(rcStream); |
| rcStream.Normalize(); |
| |
| float a = rcAnnot.Width() / rcStream.Width(); |
| float d = rcAnnot.Height() / rcStream.Height(); |
| |
| float e = rcAnnot.left - rcStream.left * a; |
| float f = rcAnnot.bottom - rcStream.bottom * d; |
| return CFX_Matrix(a, 0, 0, d, e, f); |
| } |
| |
| } // namespace |
| |
| FPDF_EXPORT int FPDF_CALLCONV FPDFPage_Flatten(FPDF_PAGE page, int nFlag) { |
| CPDF_Page* pPage = CPDFPageFromFPDFPage(page); |
| if (!page) |
| return FLATTEN_FAIL; |
| |
| CPDF_Document* pDocument = pPage->GetDocument(); |
| CPDF_Dictionary* pPageDict = pPage->GetDict(); |
| if (!pDocument || !pPageDict) |
| return FLATTEN_FAIL; |
| |
| std::vector<CPDF_Dictionary*> ObjectArray; |
| std::vector<CFX_FloatRect> RectArray; |
| int iRet = |
| ParserAnnots(pDocument, pPageDict, &RectArray, &ObjectArray, nFlag); |
| if (iRet == FLATTEN_NOTHINGTODO || iRet == FLATTEN_FAIL) |
| return iRet; |
| |
| CFX_FloatRect rcOriginalCB; |
| CFX_FloatRect rcMerger = CalculateRect(&RectArray); |
| CFX_FloatRect rcOriginalMB = |
| pPageDict->GetRectFor(pdfium::page_object::kMediaBox); |
| if (pPageDict->KeyExist(pdfium::page_object::kCropBox)) |
| rcOriginalMB = pPageDict->GetRectFor(pdfium::page_object::kCropBox); |
| |
| if (rcOriginalMB.IsEmpty()) |
| rcOriginalMB = CFX_FloatRect(0.0f, 0.0f, 612.0f, 792.0f); |
| |
| rcMerger.left = std::max(rcMerger.left, rcOriginalMB.left); |
| rcMerger.right = std::min(rcMerger.right, rcOriginalMB.right); |
| rcMerger.bottom = std::max(rcMerger.bottom, rcOriginalMB.bottom); |
| rcMerger.top = std::min(rcMerger.top, rcOriginalMB.top); |
| if (pPageDict->KeyExist("ArtBox")) |
| rcOriginalCB = pPageDict->GetRectFor("ArtBox"); |
| else |
| rcOriginalCB = rcOriginalMB; |
| |
| if (!rcOriginalMB.IsEmpty()) |
| pPageDict->SetRectFor(pdfium::page_object::kMediaBox, rcOriginalMB); |
| |
| if (!rcOriginalCB.IsEmpty()) |
| pPageDict->SetRectFor("ArtBox", rcOriginalCB); |
| |
| CPDF_Dictionary* pRes = |
| pPageDict->GetDictFor(pdfium::page_object::kResources); |
| if (!pRes) { |
| pRes = |
| pPageDict->SetNewFor<CPDF_Dictionary>(pdfium::page_object::kResources); |
| } |
| |
| CPDF_Stream* pNewXObject = pDocument->NewIndirect<CPDF_Stream>( |
| nullptr, 0, |
| pdfium::MakeUnique<CPDF_Dictionary>(pDocument->GetByteStringPool())); |
| |
| CPDF_Dictionary* pPageXObject = pRes->GetDictFor("XObject"); |
| if (!pPageXObject) |
| pPageXObject = pRes->SetNewFor<CPDF_Dictionary>("XObject"); |
| |
| ByteString key; |
| if (!ObjectArray.empty()) { |
| int i = 0; |
| while (i < INT_MAX) { |
| ByteString sKey = ByteString::Format("FFT%d", i); |
| if (!pPageXObject->KeyExist(sKey)) { |
| key = std::move(sKey); |
| break; |
| } |
| ++i; |
| } |
| } |
| |
| SetPageContents(key, pPageDict, pDocument); |
| |
| CPDF_Dictionary* pNewXORes = nullptr; |
| if (!key.IsEmpty()) { |
| pPageXObject->SetFor(key, pNewXObject->MakeReference(pDocument)); |
| CPDF_Dictionary* pNewOXbjectDic = pNewXObject->GetDict(); |
| pNewXORes = pNewOXbjectDic->SetNewFor<CPDF_Dictionary>("Resources"); |
| pNewOXbjectDic->SetNewFor<CPDF_Name>("Type", "XObject"); |
| pNewOXbjectDic->SetNewFor<CPDF_Name>("Subtype", "Form"); |
| pNewOXbjectDic->SetNewFor<CPDF_Number>("FormType", 1); |
| CFX_FloatRect rcBBox = pPageDict->GetRectFor(pdfium::page_object::kArtBox); |
| pNewOXbjectDic->SetRectFor("BBox", rcBBox); |
| } |
| |
| for (size_t i = 0; i < ObjectArray.size(); ++i) { |
| CPDF_Dictionary* pAnnotDic = ObjectArray[i]; |
| if (!pAnnotDic) |
| continue; |
| |
| CFX_FloatRect rcAnnot = pAnnotDic->GetRectFor("Rect"); |
| rcAnnot.Normalize(); |
| |
| ByteString sAnnotState = pAnnotDic->GetStringFor("AS"); |
| CPDF_Dictionary* pAnnotAP = pAnnotDic->GetDictFor("AP"); |
| if (!pAnnotAP) |
| continue; |
| |
| CPDF_Stream* pAPStream = pAnnotAP->GetStreamFor("N"); |
| if (!pAPStream) { |
| CPDF_Dictionary* pAPDic = pAnnotAP->GetDictFor("N"); |
| if (!pAPDic) |
| continue; |
| |
| if (!sAnnotState.IsEmpty()) { |
| pAPStream = pAPDic->GetStreamFor(sAnnotState); |
| } else { |
| if (pAPDic->GetCount() > 0) { |
| CPDF_Object* pFirstObj = pAPDic->begin()->second.get(); |
| if (pFirstObj) { |
| if (pFirstObj->IsReference()) |
| pFirstObj = pFirstObj->GetDirect(); |
| if (!pFirstObj->IsStream()) |
| continue; |
| pAPStream = pFirstObj->AsStream(); |
| } |
| } |
| } |
| } |
| if (!pAPStream) |
| continue; |
| |
| CPDF_Dictionary* pAPDic = pAPStream->GetDict(); |
| CFX_FloatRect rcStream; |
| if (pAPDic->KeyExist("Rect")) |
| rcStream = pAPDic->GetRectFor("Rect"); |
| else if (pAPDic->KeyExist("BBox")) |
| rcStream = pAPDic->GetRectFor("BBox"); |
| |
| if (rcStream.IsEmpty()) |
| continue; |
| |
| CPDF_Object* pObj = pAPStream; |
| if (pObj->IsInline()) { |
| std::unique_ptr<CPDF_Object> pNew = pObj->Clone(); |
| pObj = pNew.get(); |
| pDocument->AddIndirectObject(std::move(pNew)); |
| } |
| |
| CPDF_Dictionary* pObjDic = pObj->GetDict(); |
| if (pObjDic) { |
| pObjDic->SetNewFor<CPDF_Name>("Type", "XObject"); |
| pObjDic->SetNewFor<CPDF_Name>("Subtype", "Form"); |
| } |
| |
| CPDF_Dictionary* pXObject = pNewXORes->GetDictFor("XObject"); |
| if (!pXObject) |
| pXObject = pNewXORes->SetNewFor<CPDF_Dictionary>("XObject"); |
| |
| ByteString sFormName = ByteString::Format("F%d", i); |
| pXObject->SetFor(sFormName, pObj->MakeReference(pDocument)); |
| |
| auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pNewXObject); |
| pAcc->LoadAllDataFiltered(); |
| ByteString sStream(pAcc->GetData(), pAcc->GetSize()); |
| CFX_Matrix matrix = pAPDic->GetMatrixFor("Matrix"); |
| CFX_Matrix m = GetMatrix(rcAnnot, rcStream, matrix); |
| sStream += ByteString::Format("q %f 0 0 %f %f %f cm /%s Do Q\n", m.a, m.d, |
| m.e, m.f, sFormName.c_str()); |
| pNewXObject->SetDataAndRemoveFilter(sStream.AsRawSpan()); |
| } |
| pPageDict->RemoveFor("Annots"); |
| return FLATTEN_SUCCESS; |
| } |