// Copyright 2016 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 "core/fpdfapi/fpdf_page/include/cpdf_page.h"
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#include <set>
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#include "core/fpdfapi/fpdf_page/include/cpdf_pageobject.h"
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#include "core/fpdfapi/fpdf_page/pageint.h"
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#include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
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#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
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#include "core/fpdfapi/fpdf_parser/include/cpdf_object.h"
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#include "core/fpdfapi/fpdf_render/cpdf_pagerendercache.h"
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#include "third_party/base/stl_util.h"
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CPDF_Page::CPDF_Page(CPDF_Document* pDocument,
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CPDF_Dictionary* pPageDict,
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bool bPageCache)
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: m_PageWidth(100),
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m_PageHeight(100),
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m_pView(nullptr),
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m_pPageRender(bPageCache ? new CPDF_PageRenderCache(this) : nullptr) {
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m_pFormDict = pPageDict;
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m_pDocument = pDocument;
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if (!pPageDict)
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return;
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CPDF_Object* pageAttr = GetPageAttr("Resources");
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m_pResources = pageAttr ? pageAttr->GetDict() : nullptr;
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m_pPageResources = m_pResources;
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CPDF_Object* pRotate = GetPageAttr("Rotate");
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int rotate = pRotate ? pRotate->GetInteger() / 90 % 4 : 0;
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if (rotate < 0)
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rotate += 4;
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CPDF_Array* pMediaBox = ToArray(GetPageAttr("MediaBox"));
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CFX_FloatRect mediabox;
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if (pMediaBox) {
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mediabox = pMediaBox->GetRect();
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mediabox.Normalize();
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}
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if (mediabox.IsEmpty())
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mediabox = CFX_FloatRect(0, 0, 612, 792);
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CPDF_Array* pCropBox = ToArray(GetPageAttr("CropBox"));
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if (pCropBox) {
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m_BBox = pCropBox->GetRect();
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m_BBox.Normalize();
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}
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if (m_BBox.IsEmpty())
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m_BBox = mediabox;
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else
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m_BBox.Intersect(mediabox);
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m_PageWidth = m_BBox.right - m_BBox.left;
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m_PageHeight = m_BBox.top - m_BBox.bottom;
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if (rotate % 2)
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std::swap(m_PageWidth, m_PageHeight);
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switch (rotate) {
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case 0:
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m_PageMatrix.Set(1.0f, 0, 0, 1.0f, -m_BBox.left, -m_BBox.bottom);
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break;
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case 1:
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m_PageMatrix.Set(0, -1.0f, 1.0f, 0, -m_BBox.bottom, m_BBox.right);
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break;
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case 2:
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m_PageMatrix.Set(-1.0f, 0, 0, -1.0f, m_BBox.right, m_BBox.top);
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break;
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case 3:
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m_PageMatrix.Set(0, 1.0f, -1.0f, 0, m_BBox.top, -m_BBox.left);
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break;
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}
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m_Transparency = PDFTRANS_ISOLATED;
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LoadTransInfo();
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}
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CPDF_Page::~CPDF_Page() {}
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void CPDF_Page::StartParse() {
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if (m_ParseState == CONTENT_PARSED || m_ParseState == CONTENT_PARSING)
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return;
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m_pParser.reset(new CPDF_ContentParser);
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m_pParser->Start(this);
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m_ParseState = CONTENT_PARSING;
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}
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void CPDF_Page::ParseContent() {
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StartParse();
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ContinueParse(nullptr);
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}
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CPDF_Object* CPDF_Page::GetPageAttr(const CFX_ByteString& name) const {
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CPDF_Dictionary* pPageDict = m_pFormDict;
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std::set<CPDF_Dictionary*> visited;
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while (1) {
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visited.insert(pPageDict);
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if (CPDF_Object* pObj = pPageDict->GetDirectObjectBy(name))
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return pObj;
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pPageDict = pPageDict->GetDictBy("Parent");
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if (!pPageDict || pdfium::ContainsKey(visited, pPageDict))
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break;
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}
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return nullptr;
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}
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void CPDF_Page::GetDisplayMatrix(CFX_Matrix& matrix,
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int xPos,
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int yPos,
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int xSize,
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int ySize,
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int iRotate) const {
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if (m_PageWidth == 0 || m_PageHeight == 0) {
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return;
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}
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CFX_Matrix display_matrix;
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int x0 = 0;
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int y0 = 0;
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int x1 = 0;
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int y1 = 0;
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int x2 = 0;
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int y2 = 0;
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iRotate %= 4;
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switch (iRotate) {
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case 0:
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x0 = xPos;
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y0 = yPos + ySize;
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x1 = xPos;
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y1 = yPos;
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x2 = xPos + xSize;
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y2 = yPos + ySize;
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break;
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case 1:
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x0 = xPos;
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y0 = yPos;
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x1 = xPos + xSize;
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y1 = yPos;
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x2 = xPos;
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y2 = yPos + ySize;
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break;
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case 2:
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x0 = xPos + xSize;
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y0 = yPos;
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x1 = xPos + xSize;
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y1 = yPos + ySize;
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x2 = xPos;
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y2 = yPos;
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break;
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case 3:
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x0 = xPos + xSize;
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y0 = yPos + ySize;
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x1 = xPos;
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y1 = yPos + ySize;
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x2 = xPos + xSize;
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y2 = yPos;
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break;
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}
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display_matrix.Set(
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((FX_FLOAT)(x2 - x0)) / m_PageWidth, ((FX_FLOAT)(y2 - y0)) / m_PageWidth,
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((FX_FLOAT)(x1 - x0)) / m_PageHeight,
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((FX_FLOAT)(y1 - y0)) / m_PageHeight, (FX_FLOAT)x0, (FX_FLOAT)y0);
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matrix = m_PageMatrix;
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matrix.Concat(display_matrix);
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}
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