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// Copyright 2017 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.
#include <memory>
#include <utility>
#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/font/cpdf_font.h"
#include "core/fpdfapi/font/cpdf_type1font.h"
#include "core/fpdfapi/page/cpdf_textobject.h"
#include "core/fpdfapi/parser/cpdf_array.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/fxge/cfx_fontmgr.h"
#include "core/fxge/fx_font.h"
#include "fpdfsdk/fsdk_define.h"
#include "public/fpdf_edit.h"
namespace {
CPDF_Dictionary* LoadFontDesc(CPDF_Document* pDoc,
const CFX_ByteString& font_name,
CFX_Font* pFont,
const uint8_t* data,
uint32_t size,
int font_type) {
CPDF_Dictionary* fontDesc = pDoc->NewIndirect<CPDF_Dictionary>();
fontDesc->SetNewFor<CPDF_Name>("Type", "FontDescriptor");
fontDesc->SetNewFor<CPDF_Name>("FontName", font_name);
int flags = 0;
if (FXFT_Is_Face_fixedwidth(pFont->GetFace()))
flags |= FXFONT_FIXED_PITCH;
if (font_name.Find("Serif") > -1)
flags |= FXFONT_SERIF;
if (FXFT_Is_Face_Italic(pFont->GetFace()))
flags |= FXFONT_ITALIC;
if (FXFT_Is_Face_Bold(pFont->GetFace()))
flags |= FXFONT_BOLD;
// TODO(npm): How do I know if a font is symbolic, script, allcap, smallcap
flags |= FXFONT_NONSYMBOLIC;
fontDesc->SetNewFor<CPDF_Number>("Flags", flags);
FX_RECT bbox;
pFont->GetBBox(bbox);
auto pBBox = pdfium::MakeUnique<CPDF_Array>();
pBBox->AddNew<CPDF_Number>(bbox.left);
pBBox->AddNew<CPDF_Number>(bbox.bottom);
pBBox->AddNew<CPDF_Number>(bbox.right);
pBBox->AddNew<CPDF_Number>(bbox.top);
fontDesc->SetFor("FontBBox", std::move(pBBox));
// TODO(npm): calculate italic angle correctly
fontDesc->SetNewFor<CPDF_Number>("ItalicAngle", pFont->IsItalic() ? -12 : 0);
fontDesc->SetNewFor<CPDF_Number>("Ascent", pFont->GetAscent());
fontDesc->SetNewFor<CPDF_Number>("Descent", pFont->GetDescent());
// TODO(npm): calculate the capheight, stemV correctly
fontDesc->SetNewFor<CPDF_Number>("CapHeight", pFont->GetAscent());
fontDesc->SetNewFor<CPDF_Number>("StemV", pFont->IsBold() ? 120 : 70);
CPDF_Stream* pStream = pDoc->NewIndirect<CPDF_Stream>();
pStream->SetData(data, size);
CFX_ByteString fontFile =
font_type == FPDF_FONT_TYPE1 ? "FontFile" : "FontFile2";
fontDesc->SetNewFor<CPDF_Reference>(fontFile, pDoc, pStream->GetObjNum());
return fontDesc;
}
void* LoadSimpleFont(CPDF_Document* pDoc,
std::unique_ptr<CFX_Font> pFont,
const uint8_t* data,
uint32_t size,
int font_type) {
CPDF_Dictionary* fontDict = pDoc->NewIndirect<CPDF_Dictionary>();
fontDict->SetNewFor<CPDF_Name>("Type", "Font");
fontDict->SetNewFor<CPDF_Name>(
"Subtype", font_type == FPDF_FONT_TYPE1 ? "Type1" : "TrueType");
CFX_ByteString name = pFont->GetFaceName();
if (name.IsEmpty())
name = "Unnamed";
fontDict->SetNewFor<CPDF_Name>("BaseFont", name);
uint32_t glyphIndex;
int currentChar = FXFT_Get_First_Char(pFont->GetFace(), &glyphIndex);
fontDict->SetNewFor<CPDF_Number>("FirstChar", currentChar);
CPDF_Array* widthsArray = pDoc->NewIndirect<CPDF_Array>();
while (true) {
int width = pFont->GetGlyphWidth(glyphIndex);
widthsArray->AddNew<CPDF_Number>(width);
int nextChar =
FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
// Simple fonts have 1-byte charcodes only.
if (nextChar > 0xff || glyphIndex == 0)
break;
for (int i = currentChar + 1; i < nextChar; i++)
widthsArray->AddNew<CPDF_Number>(0);
currentChar = nextChar;
}
fontDict->SetNewFor<CPDF_Number>("LastChar", currentChar);
fontDict->SetNewFor<CPDF_Reference>("Widths", pDoc, widthsArray->GetObjNum());
CPDF_Dictionary* fontDesc =
LoadFontDesc(pDoc, name, pFont.get(), data, size, font_type);
fontDict->SetNewFor<CPDF_Reference>("FontDescriptor", pDoc,
fontDesc->GetObjNum());
return pDoc->LoadFont(fontDict);
}
void* LoadCompositeFont(CPDF_Document* pDoc,
std::unique_ptr<CFX_Font> pFont,
const uint8_t* data,
uint32_t size,
int font_type) {
CPDF_Dictionary* fontDict = pDoc->NewIndirect<CPDF_Dictionary>();
fontDict->SetNewFor<CPDF_Name>("Type", "Font");
fontDict->SetNewFor<CPDF_Name>("Subtype", "Type0");
// TODO(npm): Get the correct encoding, if it's not identity.
CFX_ByteString encoding = "Identity-H";
fontDict->SetNewFor<CPDF_Name>("Encoding", encoding);
CFX_ByteString name = pFont->GetFaceName();
if (name.IsEmpty())
name = "Unnamed";
fontDict->SetNewFor<CPDF_Name>(
"BaseFont", font_type == FPDF_FONT_TYPE1 ? name + "-" + encoding : name);
CPDF_Dictionary* pCIDFont = pDoc->NewIndirect<CPDF_Dictionary>();
pCIDFont->SetNewFor<CPDF_Name>("Type", "Font");
pCIDFont->SetNewFor<CPDF_Name>("Subtype", font_type == FPDF_FONT_TYPE1
? "CIDFontType0"
: "CIDFontType2");
pCIDFont->SetNewFor<CPDF_Name>("BaseFont", name);
// TODO(npm): Maybe use FT_Get_CID_Registry_Ordering_Supplement to get the
// CIDSystemInfo
CPDF_Dictionary* pCIDSystemInfo = pDoc->NewIndirect<CPDF_Dictionary>();
pCIDSystemInfo->SetNewFor<CPDF_Name>("Registry", "Adobe");
pCIDSystemInfo->SetNewFor<CPDF_Name>("Ordering", "Identity");
pCIDSystemInfo->SetNewFor<CPDF_Number>("Supplement", 0);
pCIDFont->SetNewFor<CPDF_Reference>("CIDSystemInfo", pDoc,
pCIDSystemInfo->GetObjNum());
CPDF_Dictionary* fontDesc =
LoadFontDesc(pDoc, name, pFont.get(), data, size, font_type);
pCIDFont->SetNewFor<CPDF_Reference>("FontDescriptor", pDoc,
fontDesc->GetObjNum());
uint32_t glyphIndex;
int currentChar = FXFT_Get_First_Char(pFont->GetFace(), &glyphIndex);
CPDF_Array* widthsArray = pDoc->NewIndirect<CPDF_Array>();
while (true) {
int width = pFont->GetGlyphWidth(glyphIndex);
int nextChar =
FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
if (glyphIndex == 0) {
// Only one char left, use format c [w]
auto oneW = pdfium::MakeUnique<CPDF_Array>();
oneW->AddNew<CPDF_Number>(width);
widthsArray->AddNew<CPDF_Number>(currentChar);
widthsArray->Add(std::move(oneW));
break;
}
int nextWidth = pFont->GetGlyphWidth(glyphIndex);
if (nextChar == currentChar + 1 && nextWidth == width) {
// The array can have a group c_first c_last w: all CIDs in the range from
// c_first to c_last will have width w
widthsArray->AddNew<CPDF_Number>(currentChar);
currentChar = nextChar;
while (true) {
nextChar =
FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
if (glyphIndex == 0)
break;
nextWidth = pFont->GetGlyphWidth(glyphIndex);
if (nextChar != currentChar + 1 || nextWidth != width)
break;
currentChar = nextChar;
}
widthsArray->AddNew<CPDF_Number>(currentChar);
widthsArray->AddNew<CPDF_Number>(width);
} else {
// Otherwise we can have a group of the form c [w1 w2 ...]: c has width
// w1, c+1 has width w2, etc.
widthsArray->AddNew<CPDF_Number>(currentChar);
auto curWidthArray = pdfium::MakeUnique<CPDF_Array>();
curWidthArray->AddNew<CPDF_Number>(width);
while (nextChar == currentChar + 1) {
curWidthArray->AddNew<CPDF_Number>(nextWidth);
currentChar = nextChar;
nextChar =
FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
if (glyphIndex == 0)
break;
nextWidth = pFont->GetGlyphWidth(glyphIndex);
}
widthsArray->Add(std::move(curWidthArray));
}
if (glyphIndex == 0)
break;
currentChar = nextChar;
}
pCIDFont->SetNewFor<CPDF_Reference>("W", pDoc, widthsArray->GetObjNum());
// TODO(npm): Support vertical writing
auto pDescendant = pdfium::MakeUnique<CPDF_Array>();
pDescendant->AddNew<CPDF_Reference>(pDoc, pCIDFont->GetObjNum());
fontDict->SetFor("DescendantFonts", std::move(pDescendant));
// TODO(npm): do we need a ToUnicode?
return pDoc->LoadFont(fontDict);
}
} // namespace
DLLEXPORT FPDF_PAGEOBJECT STDCALL FPDFPageObj_NewTextObj(FPDF_DOCUMENT document,
FPDF_BYTESTRING font,
float font_size) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc)
return nullptr;
CPDF_Font* pFont = CPDF_Font::GetStockFont(pDoc, CFX_ByteStringC(font));
if (!pFont)
return nullptr;
CPDF_TextObject* pTextObj = new CPDF_TextObject;
pTextObj->m_TextState.SetFont(pFont);
pTextObj->m_TextState.SetFontSize(font_size);
pTextObj->DefaultStates();
return pTextObj;
}
DLLEXPORT FPDF_BOOL STDCALL FPDFText_SetText(FPDF_PAGEOBJECT text_object,
FPDF_BYTESTRING text) {
if (!text_object)
return false;
auto pTextObj = reinterpret_cast<CPDF_TextObject*>(text_object);
pTextObj->SetText(CFX_ByteString(text));
return true;
}
DLLEXPORT FPDF_FONT STDCALL FPDFText_LoadFont(FPDF_DOCUMENT document,
const uint8_t* data,
uint32_t size,
int font_type,
FPDF_BOOL cid) {
CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
if (!pDoc || !data || size == 0 ||
(font_type != FPDF_FONT_TYPE1 && font_type != FPDF_FONT_TRUETYPE)) {
return nullptr;
}
auto pFont = pdfium::MakeUnique<CFX_Font>();
// TODO(npm): Maybe use FT_Get_X11_Font_Format to check format? Otherwise, we
// are allowing giving any font that can be loaded on freetype and setting it
// as any font type.
if (!pFont->LoadEmbedded(data, size))
return nullptr;
return cid ? LoadCompositeFont(pDoc, std::move(pFont), data, size, font_type)
: LoadSimpleFont(pDoc, std::move(pFont), data, size, font_type);
}
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