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// Copyright 2016 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 "core/fpdfapi/page/cpdf_page.h"
#include <set>
#include <utility>
#include "constants/page_object.h"
#include "core/fpdfapi/page/cpdf_contentparser.h"
#include "core/fpdfapi/page/cpdf_pageobject.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_object.h"
#include "third_party/base/stl_util.h"
CPDF_Page::CPDF_Page(CPDF_Document* pDocument, CPDF_Dictionary* pPageDict)
: CPDF_PageObjectHolder(pDocument, pPageDict, nullptr, nullptr),
m_PageSize(100, 100),
m_pPDFDocument(pDocument) {
ASSERT(pPageDict);
// Cannot initialize |m_pResources| and |m_pPageResources| via the
// CPDF_PageObjectHolder ctor because GetPageAttr() requires
// CPDF_PageObjectHolder to finish initializing first.
CPDF_Object* pPageAttr = GetPageAttr(pdfium::page_object::kResources);
m_pResources.Reset(pPageAttr ? pPageAttr->GetDict() : nullptr);
m_pPageResources = m_pResources;
UpdateDimensions();
m_Transparency.SetIsolated();
LoadTransparencyInfo();
}
CPDF_Page::~CPDF_Page() = default;
CPDF_Page* CPDF_Page::AsPDFPage() {
return this;
}
CPDFXFA_Page* CPDF_Page::AsXFAPage() {
return nullptr;
}
CPDF_Document* CPDF_Page::GetDocument() const {
return GetPDFDocument();
}
float CPDF_Page::GetPageWidth() const {
return m_PageSize.width;
}
float CPDF_Page::GetPageHeight() const {
return m_PageSize.height;
}
bool CPDF_Page::IsPage() const {
return true;
}
void CPDF_Page::ParseContent() {
if (GetParseState() == ParseState::kParsed)
return;
if (GetParseState() == ParseState::kNotParsed)
StartParse(std::make_unique<CPDF_ContentParser>(this));
ASSERT(GetParseState() == ParseState::kParsing);
ContinueParse(nullptr);
}
CPDF_Object* CPDF_Page::GetPageAttr(const ByteString& name) const {
CPDF_Dictionary* pPageDict = GetDict();
std::set<CPDF_Dictionary*> visited;
while (1) {
visited.insert(pPageDict);
if (CPDF_Object* pObj = pPageDict->GetDirectObjectFor(name))
return pObj;
pPageDict = pPageDict->GetDictFor(pdfium::page_object::kParent);
if (!pPageDict || pdfium::Contains(visited, pPageDict))
break;
}
return nullptr;
}
CFX_FloatRect CPDF_Page::GetBox(const ByteString& name) const {
CFX_FloatRect box;
CPDF_Array* pBox = ToArray(GetPageAttr(name));
if (pBox) {
box = pBox->GetRect();
box.Normalize();
}
return box;
}
Optional<CFX_PointF> CPDF_Page::DeviceToPage(
const FX_RECT& rect,
int rotate,
const CFX_PointF& device_point) const {
CFX_Matrix page2device = GetDisplayMatrix(rect, rotate);
return page2device.GetInverse().Transform(device_point);
}
Optional<CFX_PointF> CPDF_Page::PageToDevice(
const FX_RECT& rect,
int rotate,
const CFX_PointF& page_point) const {
CFX_Matrix page2device = GetDisplayMatrix(rect, rotate);
return page2device.Transform(page_point);
}
CFX_Matrix CPDF_Page::GetDisplayMatrix(const FX_RECT& rect, int iRotate) const {
if (m_PageSize.width == 0 || m_PageSize.height == 0)
return CFX_Matrix();
float x0 = 0;
float y0 = 0;
float x1 = 0;
float y1 = 0;
float x2 = 0;
float y2 = 0;
iRotate %= 4;
// This code implicitly inverts the y-axis to account for page coordinates
// pointing up and bitmap coordinates pointing down. (x0, y0) is the base
// point, (x1, y1) is that point translated on y and (x2, y2) is the point
// translated on x. On iRotate = 0, y0 is rect.bottom and the translation
// to get y1 is performed as negative. This results in the desired
// transformation.
switch (iRotate) {
case 0:
x0 = rect.left;
y0 = rect.bottom;
x1 = rect.left;
y1 = rect.top;
x2 = rect.right;
y2 = rect.bottom;
break;
case 1:
x0 = rect.left;
y0 = rect.top;
x1 = rect.right;
y1 = rect.top;
x2 = rect.left;
y2 = rect.bottom;
break;
case 2:
x0 = rect.right;
y0 = rect.top;
x1 = rect.right;
y1 = rect.bottom;
x2 = rect.left;
y2 = rect.top;
break;
case 3:
x0 = rect.right;
y0 = rect.bottom;
x1 = rect.left;
y1 = rect.bottom;
x2 = rect.right;
y2 = rect.top;
break;
}
CFX_Matrix matrix((x2 - x0) / m_PageSize.width, (y2 - y0) / m_PageSize.width,
(x1 - x0) / m_PageSize.height,
(y1 - y0) / m_PageSize.height, x0, y0);
return m_PageMatrix * matrix;
}
int CPDF_Page::GetPageRotation() const {
CPDF_Object* pRotate = GetPageAttr(pdfium::page_object::kRotate);
int rotate = pRotate ? (pRotate->GetInteger() / 90) % 4 : 0;
return (rotate < 0) ? (rotate + 4) : rotate;
}
void CPDF_Page::UpdateDimensions() {
CFX_FloatRect mediabox = GetBox(pdfium::page_object::kMediaBox);
if (mediabox.IsEmpty())
mediabox = CFX_FloatRect(0, 0, 612, 792);
m_BBox = GetBox(pdfium::page_object::kCropBox);
if (m_BBox.IsEmpty())
m_BBox = mediabox;
else
m_BBox.Intersect(mediabox);
m_PageSize.width = m_BBox.Width();
m_PageSize.height = m_BBox.Height();
switch (GetPageRotation()) {
case 0:
m_PageMatrix = CFX_Matrix(1.0f, 0, 0, 1.0f, -m_BBox.left, -m_BBox.bottom);
break;
case 1:
std::swap(m_PageSize.width, m_PageSize.height);
m_PageMatrix =
CFX_Matrix(0, -1.0f, 1.0f, 0, -m_BBox.bottom, m_BBox.right);
break;
case 2:
m_PageMatrix = CFX_Matrix(-1.0f, 0, 0, -1.0f, m_BBox.right, m_BBox.top);
break;
case 3:
std::swap(m_PageSize.width, m_PageSize.height);
m_PageMatrix = CFX_Matrix(0, 1.0f, -1.0f, 0, m_BBox.top, -m_BBox.left);
break;
}
}
CPDF_Page::RenderContextClearer::RenderContextClearer(CPDF_Page* pPage)
: m_pPage(pPage) {}
CPDF_Page::RenderContextClearer::~RenderContextClearer() {
m_pPage->SetRenderContext(nullptr);
}