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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/edit/cpdf_pagecontentgenerator.h"
#include <tuple>
#include <utility>
#include "core/fpdfapi/page/cpdf_docpagedata.h"
#include "core/fpdfapi/page/cpdf_image.h"
#include "core/fpdfapi/page/cpdf_imageobject.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_path.h"
#include "core/fpdfapi/page/cpdf_pathobject.h"
#include "core/fpdfapi/parser/cpdf_dictionary.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/fpdf_parser_decode.h"
namespace {
CFX_ByteTextBuf& operator<<(CFX_ByteTextBuf& ar, const CFX_Matrix& matrix) {
ar << matrix.a << " " << matrix.b << " " << matrix.c << " " << matrix.d << " "
<< matrix.e << " " << matrix.f;
return ar;
}
bool GetColor(const CPDF_Color* pColor, FX_FLOAT* rgb) {
int intRGB[3];
if (!pColor ||
pColor->GetColorSpace() != CPDF_ColorSpace::GetStockCS(PDFCS_DEVICERGB) ||
!pColor->GetRGB(intRGB[0], intRGB[1], intRGB[2])) {
return false;
}
rgb[0] = intRGB[0] / 255.0f;
rgb[1] = intRGB[1] / 255.0f;
rgb[2] = intRGB[2] / 255.0f;
return true;
}
} // namespace
CPDF_PageContentGenerator::CPDF_PageContentGenerator(CPDF_Page* pPage)
: m_pPage(pPage), m_pDocument(m_pPage->m_pDocument) {
for (const auto& pObj : *pPage->GetPageObjectList()) {
if (pObj)
m_pageObjects.push_back(pObj.get());
}
}
CPDF_PageContentGenerator::~CPDF_PageContentGenerator() {}
void CPDF_PageContentGenerator::GenerateContent() {
CFX_ByteTextBuf buf;
for (CPDF_PageObject* pPageObj : m_pageObjects) {
if (CPDF_ImageObject* pImageObject = pPageObj->AsImage())
ProcessImage(&buf, pImageObject);
else if (CPDF_PathObject* pPathObj = pPageObj->AsPath())
ProcessPath(&buf, pPathObj);
}
CPDF_Dictionary* pPageDict = m_pPage->m_pFormDict;
CPDF_Object* pContent =
pPageDict ? pPageDict->GetDirectObjectFor("Contents") : nullptr;
if (pContent)
pPageDict->RemoveFor("Contents");
CPDF_Stream* pStream = m_pDocument->NewIndirect<CPDF_Stream>();
pStream->SetData(buf.GetBuffer(), buf.GetLength());
pPageDict->SetNewFor<CPDF_Reference>("Contents", m_pDocument,
pStream->GetObjNum());
}
CFX_ByteString CPDF_PageContentGenerator::RealizeResource(
uint32_t dwResourceObjNum,
const CFX_ByteString& bsType) {
ASSERT(dwResourceObjNum);
if (!m_pPage->m_pResources) {
m_pPage->m_pResources = m_pDocument->NewIndirect<CPDF_Dictionary>();
m_pPage->m_pFormDict->SetNewFor<CPDF_Reference>(
"Resources", m_pDocument, m_pPage->m_pResources->GetObjNum());
}
CPDF_Dictionary* pResList = m_pPage->m_pResources->GetDictFor(bsType);
if (!pResList)
pResList = m_pPage->m_pResources->SetNewFor<CPDF_Dictionary>(bsType);
CFX_ByteString name;
int idnum = 1;
while (1) {
name.Format("FX%c%d", bsType[0], idnum);
if (!pResList->KeyExist(name)) {
break;
}
idnum++;
}
pResList->SetNewFor<CPDF_Reference>(name, m_pDocument, dwResourceObjNum);
return name;
}
void CPDF_PageContentGenerator::ProcessImage(CFX_ByteTextBuf* buf,
CPDF_ImageObject* pImageObj) {
if ((pImageObj->matrix().a == 0 && pImageObj->matrix().b == 0) ||
(pImageObj->matrix().c == 0 && pImageObj->matrix().d == 0)) {
return;
}
*buf << "q " << pImageObj->matrix() << " cm ";
CPDF_Image* pImage = pImageObj->GetImage();
if (pImage->IsInline())
return;
CPDF_Stream* pStream = pImage->GetStream();
if (!pStream)
return;
bool bWasInline = pStream->IsInline();
if (bWasInline)
pImage->ConvertStreamToIndirectObject();
uint32_t dwObjNum = pStream->GetObjNum();
CFX_ByteString name = RealizeResource(dwObjNum, "XObject");
if (bWasInline)
pImageObj->SetUnownedImage(m_pDocument->GetPageData()->GetImage(dwObjNum));
*buf << "/" << PDF_NameEncode(name) << " Do Q\n";
}
// Processing path with operators from Tables 4.9 and 4.10 of PDF spec 1.7:
// "re" appends a rectangle (here, used only if the whole path is a rectangle)
// "m" moves current point to the given coordinates
// "l" creates a line from current point to the new point
// "c" adds a Bezier curve from current to last point, using the two other
// points as the Bezier control points
// Note: "l", "c" change the current point
// "h" closes the subpath (appends a line from current to starting point)
// Path painting operators: "S", "n", "B", "f", "B*", "f*", depending on
// the filling mode and whether we want stroking the path or not.
// "Q" restores the graphics state imposed by the ProcessGraphics method.
void CPDF_PageContentGenerator::ProcessPath(CFX_ByteTextBuf* buf,
CPDF_PathObject* pPathObj) {
ProcessGraphics(buf, pPathObj);
const FX_PATHPOINT* pPoints = pPathObj->m_Path.GetPoints();
if (pPathObj->m_Path.IsRect()) {
*buf << pPoints[0].m_PointX << " " << pPoints[0].m_PointY << " "
<< (pPoints[2].m_PointX - pPoints[0].m_PointX) << " "
<< (pPoints[2].m_PointY - pPoints[0].m_PointY) << " re";
} else {
int numPoints = pPathObj->m_Path.GetPointCount();
for (int i = 0; i < numPoints; i++) {
if (i > 0)
*buf << " ";
*buf << pPoints[i].m_PointX << " " << pPoints[i].m_PointY;
FXPT_TYPE pointType = pPoints[i].m_Type;
if (pointType == FXPT_TYPE::MoveTo) {
*buf << " m";
} else if (pointType == FXPT_TYPE::LineTo) {
*buf << " l";
} else if (pointType == FXPT_TYPE::BezierTo) {
if (i + 2 >= numPoints ||
!pPoints[i].IsTypeAndOpen(FXPT_TYPE::BezierTo) ||
!pPoints[i + 1].IsTypeAndOpen(FXPT_TYPE::BezierTo) ||
pPoints[i + 2].m_Type != FXPT_TYPE::BezierTo) {
// If format is not supported, close the path and paint
*buf << " h";
break;
}
*buf << " " << pPoints[i + 1].m_PointX << " " << pPoints[i + 1].m_PointY
<< " " << pPoints[i + 2].m_PointX << " " << pPoints[i + 2].m_PointY
<< " c";
i += 2;
}
if (pPoints[i].m_CloseFigure)
*buf << " h";
}
}
if (pPathObj->m_FillType == 0)
*buf << (pPathObj->m_bStroke ? " S" : " n");
else if (pPathObj->m_FillType == FXFILL_WINDING)
*buf << (pPathObj->m_bStroke ? " B" : " f");
else if (pPathObj->m_FillType == FXFILL_ALTERNATE)
*buf << (pPathObj->m_bStroke ? " B*" : " f*");
*buf << " Q\n";
}
// This method supports color operators rg and RGB from Table 4.24 of PDF spec
// 1.7. A color will not be set if the colorspace is not DefaultRGB or the RGB
// values cannot be obtained. The method also adds an external graphics
// dictionary, as described in Section 4.3.4.
// "rg" sets the fill color, "RG" sets the stroke color (using DefaultRGB)
// "ca" sets the fill alpha, "CA" sets the stroke alpha.
// "q" saves the graphics state, so that the settings can later be reversed
void CPDF_PageContentGenerator::ProcessGraphics(CFX_ByteTextBuf* buf,
CPDF_PageObject* pPageObj) {
*buf << "q ";
FX_FLOAT fillColor[3];
if (GetColor(pPageObj->m_ColorState.GetFillColor(), fillColor)) {
*buf << fillColor[0] << " " << fillColor[1] << " " << fillColor[2]
<< " rg ";
}
FX_FLOAT strokeColor[3];
if (GetColor(pPageObj->m_ColorState.GetStrokeColor(), strokeColor)) {
*buf << strokeColor[0] << " " << strokeColor[1] << " " << strokeColor[2]
<< " RG ";
}
GraphicsData graphD;
graphD.fillAlpha = pPageObj->m_GeneralState.GetFillAlpha();
graphD.strokeAlpha = pPageObj->m_GeneralState.GetStrokeAlpha();
if (graphD.fillAlpha == 1.0f && graphD.strokeAlpha == 1.0f)
return;
CFX_ByteString name;
auto it = m_GraphicsMap.find(graphD);
if (it != m_GraphicsMap.end()) {
name = it->second;
} else {
auto gsDict = pdfium::MakeUnique<CPDF_Dictionary>();
gsDict->SetNewFor<CPDF_Number>("ca", graphD.fillAlpha);
gsDict->SetNewFor<CPDF_Number>("CA", graphD.strokeAlpha);
CPDF_Object* pDict = m_pDocument->AddIndirectObject(std::move(gsDict));
uint32_t dwObjNum = pDict->GetObjNum();
name = RealizeResource(dwObjNum, "ExtGState");
m_GraphicsMap[graphD] = name;
}
*buf << "/" << PDF_NameEncode(name) << " gs ";
}
bool CPDF_PageContentGenerator::GraphicsData::operator<(
const GraphicsData& other) const {
if (fillAlpha != other.fillAlpha)
return fillAlpha < other.fillAlpha;
return strokeAlpha < other.strokeAlpha;
}
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