Example #1
0
FPDF_EXPORT void FPDF_CALLCONV FPDFPage_InsertClipPath(FPDF_PAGE page,
                                                       FPDF_CLIPPATH clipPath) {
  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage)
    return;

  CPDF_Dictionary* pPageDict = pPage->GetDict();
  CPDF_Object* pContentObj = GetPageContent(pPageDict);
  if (!pContentObj)
    return;

  std::ostringstream strClip;
  CPDF_ClipPath* pClipPath = CPDFClipPathFromFPDFClipPath(clipPath);
  for (size_t i = 0; i < pClipPath->GetPathCount(); ++i) {
    CPDF_Path path = pClipPath->GetPath(i);
    if (path.GetPoints().empty()) {
      // Empty clipping (totally clipped out)
      strClip << "0 0 m W n ";
    } else {
      OutputPath(strClip, path);
      if (pClipPath->GetClipType(i) == FXFILL_WINDING)
        strClip << "W n\n";
      else
        strClip << "W* n\n";
    }
  }
  CPDF_Document* pDoc = pPage->GetDocument();
  if (!pDoc)
    return;

  CPDF_Stream* pStream =
      pDoc->NewIndirect<CPDF_Stream>(nullptr, 0, pDoc->New<CPDF_Dictionary>());
  pStream->SetDataFromStringstream(&strClip);

  if (CPDF_Array* pArray = ToArray(pContentObj)) {
    pArray->InsertAt(0, pStream->MakeReference(pDoc));
  } else if (pContentObj->IsStream() && !pContentObj->IsInline()) {
    CPDF_Array* pContentArray = pDoc->NewIndirect<CPDF_Array>();
    pContentArray->Add(pStream->MakeReference(pDoc));
    pContentArray->Add(pContentObj->MakeReference(pDoc));
    pPageDict->SetFor(pdfium::page_object::kContents,
                      pContentArray->MakeReference(pDoc));
  }
}
Example #2
0
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFPage_TransFormWithClip(FPDF_PAGE page,
                           const FS_MATRIX* matrix,
                           const FS_RECTF* clipRect) {
  if (!matrix && !clipRect)
    return false;

  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
  if (!pPage)
    return false;

  std::ostringstream textBuf;
  textBuf << "q ";

  if (clipRect) {
    CFX_FloatRect rect = CFXFloatRectFromFSRECTF(*clipRect);
    rect.Normalize();

    textBuf << ByteString::Format("%f %f %f %f re W* n ", rect.left,
                                  rect.bottom, rect.Width(), rect.Height());
  }
  if (matrix) {
    textBuf << ByteString::Format("%f %f %f %f %f %f cm ", matrix->a, matrix->b,
                                  matrix->c, matrix->d, matrix->e, matrix->f);
  }

  CPDF_Dictionary* pPageDict = pPage->GetDict();
  CPDF_Object* pContentObj = GetPageContent(pPageDict);
  if (!pContentObj)
    return false;

  CPDF_Document* pDoc = pPage->GetDocument();
  if (!pDoc)
    return false;

  CPDF_Stream* pStream =
      pDoc->NewIndirect<CPDF_Stream>(nullptr, 0, pDoc->New<CPDF_Dictionary>());
  pStream->SetDataFromStringstream(&textBuf);

  CPDF_Stream* pEndStream =
      pDoc->NewIndirect<CPDF_Stream>(nullptr, 0, pDoc->New<CPDF_Dictionary>());
  pEndStream->SetData(ByteStringView(" Q").span());

  if (CPDF_Array* pContentArray = ToArray(pContentObj)) {
    pContentArray->InsertAt(0, pStream->MakeReference(pDoc));
    pContentArray->Add(pEndStream->MakeReference(pDoc));
  } else if (pContentObj->IsStream() && !pContentObj->IsInline()) {
    pContentArray = pDoc->NewIndirect<CPDF_Array>();
    pContentArray->Add(pStream->MakeReference(pDoc));
    pContentArray->Add(pContentObj->MakeReference(pDoc));
    pContentArray->Add(pEndStream->MakeReference(pDoc));
    pPageDict->SetFor(pdfium::page_object::kContents,
                      pContentArray->MakeReference(pDoc));
  }

  // Need to transform the patterns as well.
  CPDF_Dictionary* pRes =
      pPageDict->GetDictFor(pdfium::page_object::kResources);
  if (!pRes)
    return true;

  CPDF_Dictionary* pPatternDict = pRes->GetDictFor("Pattern");
  if (!pPatternDict)
    return true;

  CPDF_DictionaryLocker locker(pPatternDict);
  for (const auto& it : locker) {
    CPDF_Object* pObj = it.second.get();
    if (pObj->IsReference())
      pObj = pObj->GetDirect();

    CPDF_Dictionary* pDict = nullptr;
    if (pObj->IsDictionary())
      pDict = pObj->AsDictionary();
    else if (CPDF_Stream* pObjStream = pObj->AsStream())
      pDict = pObjStream->GetDict();
    else
      continue;

    if (matrix) {
      CFX_Matrix m = CFXMatrixFromFSMatrix(*matrix);
      pDict->SetMatrixFor("Matrix", pDict->GetMatrixFor("Matrix") * m);
    }
  }

  return true;
}