// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "public/fpdf_transformpage.h"
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#include <memory>
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#include <sstream>
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#include <vector>
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#include "core/fpdfapi/page/cpdf_clippath.h"
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#include "core/fpdfapi/page/cpdf_page.h"
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#include "core/fpdfapi/page/cpdf_pageobject.h"
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#include "core/fpdfapi/page/cpdf_path.h"
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#include "core/fpdfapi/parser/cpdf_array.h"
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#include "core/fpdfapi/parser/cpdf_document.h"
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#include "core/fpdfapi/parser/cpdf_number.h"
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#include "core/fpdfapi/parser/cpdf_reference.h"
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#include "core/fpdfapi/parser/cpdf_stream.h"
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#include "core/fxge/cfx_pathdata.h"
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#include "fpdfsdk/fsdk_define.h"
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namespace {
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void SetBoundingBox(CPDF_Page* page,
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const ByteString& key,
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float left,
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float bottom,
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float right,
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float top) {
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CPDF_Array* pBoundingBoxArray = page->m_pFormDict->SetNewFor<CPDF_Array>(key);
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pBoundingBoxArray->AddNew<CPDF_Number>(left);
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pBoundingBoxArray->AddNew<CPDF_Number>(bottom);
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pBoundingBoxArray->AddNew<CPDF_Number>(right);
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pBoundingBoxArray->AddNew<CPDF_Number>(top);
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}
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bool GetBoundingBox(CPDF_Page* page,
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const ByteString& key,
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float* left,
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float* bottom,
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float* right,
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float* top) {
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CPDF_Array* pArray = page->m_pFormDict->GetArrayFor(key);
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if (!pArray)
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return false;
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*left = pArray->GetFloatAt(0);
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*bottom = pArray->GetFloatAt(1);
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*right = pArray->GetFloatAt(2);
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*top = pArray->GetFloatAt(3);
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return true;
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}
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CPDF_Object* GetPageContent(CPDF_Dictionary* pPageDict) {
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return pPageDict ? pPageDict->GetDirectObjectFor("Contents") : nullptr;
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}
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} // namespace
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FPDF_EXPORT void FPDF_CALLCONV FPDFPage_SetMediaBox(FPDF_PAGE page,
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float left,
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float bottom,
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float right,
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float top) {
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CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
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if (!pPage)
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return;
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SetBoundingBox(pPage, "MediaBox", left, bottom, right, top);
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}
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FPDF_EXPORT void FPDF_CALLCONV FPDFPage_SetCropBox(FPDF_PAGE page,
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float left,
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float bottom,
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float right,
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float top) {
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CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
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if (!pPage)
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return;
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SetBoundingBox(pPage, "CropBox", left, bottom, right, top);
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}
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFPage_GetMediaBox(FPDF_PAGE page,
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float* left,
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float* bottom,
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float* right,
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float* top) {
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CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
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return pPage && GetBoundingBox(pPage, "MediaBox", left, bottom, right, top);
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}
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFPage_GetCropBox(FPDF_PAGE page,
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float* left,
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float* bottom,
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float* right,
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float* top) {
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CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
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return pPage && GetBoundingBox(pPage, "CropBox", left, bottom, right, top);
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}
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
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FPDFPage_TransFormWithClip(FPDF_PAGE page,
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FS_MATRIX* matrix,
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FS_RECTF* clipRect) {
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if (!matrix && !clipRect)
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return false;
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CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
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if (!pPage)
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return false;
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std::ostringstream textBuf;
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textBuf << "q ";
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if (clipRect) {
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CFX_FloatRect rect = CFXFloatRectFromFSRECTF(*clipRect);
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rect.Normalize();
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textBuf << ByteString::Format("%f %f %f %f re W* n ", rect.left,
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rect.bottom, rect.Width(), rect.Height());
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}
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if (matrix) {
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textBuf << ByteString::Format("%f %f %f %f %f %f cm ", matrix->a, matrix->b,
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matrix->c, matrix->d, matrix->e, matrix->f);
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}
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CPDF_Dictionary* pPageDict = pPage->m_pFormDict.Get();
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CPDF_Object* pContentObj = GetPageContent(pPageDict);
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if (!pContentObj)
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return false;
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CPDF_Document* pDoc = pPage->m_pDocument.Get();
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if (!pDoc)
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return false;
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CPDF_Stream* pStream = pDoc->NewIndirect<CPDF_Stream>(
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nullptr, 0,
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pdfium::MakeUnique<CPDF_Dictionary>(pDoc->GetByteStringPool()));
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pStream->SetData(&textBuf);
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CPDF_Stream* pEndStream = pDoc->NewIndirect<CPDF_Stream>(
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nullptr, 0,
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pdfium::MakeUnique<CPDF_Dictionary>(pDoc->GetByteStringPool()));
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pEndStream->SetData((const uint8_t*)" Q", 2);
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if (CPDF_Array* pContentArray = ToArray(pContentObj)) {
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pContentArray->InsertNewAt<CPDF_Reference>(0, pDoc, pStream->GetObjNum());
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pContentArray->AddNew<CPDF_Reference>(pDoc, pEndStream->GetObjNum());
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} else if (pContentObj->IsStream() && !pContentObj->IsInline()) {
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CPDF_Array* pContentArray = pDoc->NewIndirect<CPDF_Array>();
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pContentArray->AddNew<CPDF_Reference>(pDoc, pStream->GetObjNum());
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pContentArray->AddNew<CPDF_Reference>(pDoc, pContentObj->GetObjNum());
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pContentArray->AddNew<CPDF_Reference>(pDoc, pEndStream->GetObjNum());
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pPageDict->SetNewFor<CPDF_Reference>("Contents", pDoc,
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pContentArray->GetObjNum());
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}
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// Need to transform the patterns as well.
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CPDF_Dictionary* pRes = pPageDict->GetDictFor("Resources");
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if (pRes) {
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CPDF_Dictionary* pPattenDict = pRes->GetDictFor("Pattern");
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if (pPattenDict) {
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for (const auto& it : *pPattenDict) {
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CPDF_Object* pObj = it.second.get();
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if (pObj->IsReference())
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pObj = pObj->GetDirect();
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CPDF_Dictionary* pDict = nullptr;
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if (pObj->IsDictionary())
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pDict = pObj->AsDictionary();
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else if (CPDF_Stream* pObjStream = pObj->AsStream())
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pDict = pObjStream->GetDict();
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else
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continue;
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CFX_Matrix m = pDict->GetMatrixFor("Matrix");
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CFX_Matrix t = *(CFX_Matrix*)matrix;
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m.Concat(t);
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pDict->SetMatrixFor("Matrix", m);
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}
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}
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}
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return true;
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}
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FPDF_EXPORT void FPDF_CALLCONV
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FPDFPageObj_TransformClipPath(FPDF_PAGEOBJECT page_object,
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double a,
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double b,
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double c,
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double d,
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double e,
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double f) {
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CPDF_PageObject* pPageObj = (CPDF_PageObject*)page_object;
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if (!pPageObj)
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return;
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CFX_Matrix matrix((float)a, (float)b, (float)c, (float)d, (float)e, (float)f);
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// Special treatment to shading object, because the ClipPath for shading
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// object is already transformed.
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if (!pPageObj->IsShading())
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pPageObj->TransformClipPath(matrix);
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pPageObj->TransformGeneralState(matrix);
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}
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FPDF_EXPORT FPDF_CLIPPATH FPDF_CALLCONV FPDF_CreateClipPath(float left,
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float bottom,
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float right,
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float top) {
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CPDF_Path Path;
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Path.AppendRect(left, bottom, right, top);
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auto pNewClipPath = pdfium::MakeUnique<CPDF_ClipPath>();
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pNewClipPath->AppendPath(Path, FXFILL_ALTERNATE, false);
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return pNewClipPath.release(); // Caller takes ownership.
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}
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FPDF_EXPORT void FPDF_CALLCONV FPDF_DestroyClipPath(FPDF_CLIPPATH clipPath) {
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// Take ownership back from caller and destroy.
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std::unique_ptr<CPDF_ClipPath>(static_cast<CPDF_ClipPath*>(clipPath));
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}
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void OutputPath(std::ostringstream& buf, CPDF_Path path) {
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const CFX_PathData* pPathData = path.GetObject();
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if (!pPathData)
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return;
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const std::vector<FX_PATHPOINT>& pPoints = pPathData->GetPoints();
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if (path.IsRect()) {
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CFX_PointF diff = pPoints[2].m_Point - pPoints[0].m_Point;
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buf << pPoints[0].m_Point.x << " " << pPoints[0].m_Point.y << " " << diff.x
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<< " " << diff.y << " re\n";
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return;
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}
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ByteString temp;
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for (size_t i = 0; i < pPoints.size(); i++) {
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buf << pPoints[i].m_Point.x << " " << pPoints[i].m_Point.y;
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FXPT_TYPE point_type = pPoints[i].m_Type;
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if (point_type == FXPT_TYPE::MoveTo) {
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buf << " m\n";
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} else if (point_type == FXPT_TYPE::BezierTo) {
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buf << " " << pPoints[i + 1].m_Point.x << " " << pPoints[i + 1].m_Point.y
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<< " " << pPoints[i + 2].m_Point.x << " " << pPoints[i + 2].m_Point.y;
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buf << " c";
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if (pPoints[i + 2].m_CloseFigure)
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buf << " h";
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buf << "\n";
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i += 2;
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} else if (point_type == FXPT_TYPE::LineTo) {
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buf << " l";
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if (pPoints[i].m_CloseFigure)
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buf << " h";
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buf << "\n";
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}
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}
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}
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FPDF_EXPORT void FPDF_CALLCONV FPDFPage_InsertClipPath(FPDF_PAGE page,
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FPDF_CLIPPATH clipPath) {
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CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
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if (!pPage)
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return;
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CPDF_Dictionary* pPageDict = pPage->m_pFormDict.Get();
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CPDF_Object* pContentObj = GetPageContent(pPageDict);
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if (!pContentObj)
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return;
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std::ostringstream strClip;
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CPDF_ClipPath* pClipPath = (CPDF_ClipPath*)clipPath;
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for (size_t i = 0; i < pClipPath->GetPathCount(); ++i) {
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CPDF_Path path = pClipPath->GetPath(i);
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if (path.GetPoints().empty()) {
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// Empty clipping (totally clipped out)
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strClip << "0 0 m W n ";
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} else {
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OutputPath(strClip, path);
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if (pClipPath->GetClipType(i) == FXFILL_WINDING)
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strClip << "W n\n";
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else
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strClip << "W* n\n";
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}
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}
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CPDF_Document* pDoc = pPage->m_pDocument.Get();
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if (!pDoc)
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return;
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CPDF_Stream* pStream = pDoc->NewIndirect<CPDF_Stream>(
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nullptr, 0,
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pdfium::MakeUnique<CPDF_Dictionary>(pDoc->GetByteStringPool()));
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pStream->SetData(&strClip);
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if (CPDF_Array* pArray = ToArray(pContentObj)) {
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pArray->InsertNewAt<CPDF_Reference>(0, pDoc, pStream->GetObjNum());
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} else if (pContentObj->IsStream() && !pContentObj->IsInline()) {
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CPDF_Array* pContentArray = pDoc->NewIndirect<CPDF_Array>();
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pContentArray->AddNew<CPDF_Reference>(pDoc, pStream->GetObjNum());
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pContentArray->AddNew<CPDF_Reference>(pDoc, pContentObj->GetObjNum());
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pPageDict->SetNewFor<CPDF_Reference>("Contents", pDoc,
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pContentArray->GetObjNum());
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}
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}
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