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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/font/cpdf_simplefont.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fxge/fx_freetype.h"
#include "third_party/base/numerics/safe_math.h"
CPDF_SimpleFont::CPDF_SimpleFont() : m_BaseEncoding(PDFFONT_ENCODING_BUILTIN) {
memset(m_CharWidth, 0xff, sizeof(m_CharWidth));
memset(m_GlyphIndex, 0xff, sizeof(m_GlyphIndex));
memset(m_ExtGID, 0xff, sizeof(m_ExtGID));
for (size_t i = 0; i < FX_ArraySize(m_CharBBox); ++i)
m_CharBBox[i] = FX_RECT(-1, -1, -1, -1);
}
CPDF_SimpleFont::~CPDF_SimpleFont() {}
int CPDF_SimpleFont::GlyphFromCharCode(uint32_t charcode, bool* pVertGlyph) {
if (pVertGlyph)
*pVertGlyph = false;
if (charcode > 0xff)
return -1;
int index = m_GlyphIndex[charcode];
if (index == 0xffff || (index == 0 && IsTrueTypeFont()))
return -1;
return index;
}
void CPDF_SimpleFont::LoadCharMetrics(int charcode) {
if (!m_Font.GetFace())
return;
if (charcode < 0 || charcode > 0xff) {
return;
}
int glyph_index = m_GlyphIndex[charcode];
if (glyph_index == 0xffff) {
if (!m_pFontFile && charcode != 32) {
LoadCharMetrics(32);
m_CharBBox[charcode] = m_CharBBox[32];
if (m_bUseFontWidth) {
m_CharWidth[charcode] = m_CharWidth[32];
}
}
return;
}
FXFT_Face face = m_Font.GetFace();
int err = FXFT_Load_Glyph(
face, glyph_index,
FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
if (err)
return;
int iHoriBearingX = FXFT_Get_Glyph_HoriBearingX(face);
int iHoriBearingY = FXFT_Get_Glyph_HoriBearingY(face);
m_CharBBox[charcode] =
FX_RECT(TT2PDF(iHoriBearingX, face), TT2PDF(iHoriBearingY, face),
TT2PDF(iHoriBearingX + FXFT_Get_Glyph_Width(face), face),
TT2PDF(iHoriBearingY - FXFT_Get_Glyph_Height(face), face));
if (m_bUseFontWidth) {
int TT_Width = TT2PDF(FXFT_Get_Glyph_HoriAdvance(face), face);
if (m_CharWidth[charcode] == 0xffff) {
m_CharWidth[charcode] = TT_Width;
} else if (TT_Width && !IsEmbedded()) {
m_CharBBox[charcode].right =
m_CharBBox[charcode].right * m_CharWidth[charcode] / TT_Width;
m_CharBBox[charcode].left =
m_CharBBox[charcode].left * m_CharWidth[charcode] / TT_Width;
}
}
}
uint32_t CPDF_SimpleFont::GetCharWidthF(uint32_t charcode) {
if (charcode > 0xff)
charcode = 0;
if (m_CharWidth[charcode] == 0xffff) {
LoadCharMetrics(charcode);
if (m_CharWidth[charcode] == 0xffff) {
m_CharWidth[charcode] = 0;
}
}
return m_CharWidth[charcode];
}
FX_RECT CPDF_SimpleFont::GetCharBBox(uint32_t charcode) {
if (charcode > 0xff)
charcode = 0;
if (m_CharBBox[charcode].left == -1)
LoadCharMetrics(charcode);
return m_CharBBox[charcode];
}
bool CPDF_SimpleFont::LoadCommon() {
CPDF_Dictionary* pFontDesc = m_pFontDict->GetDictFor("FontDescriptor");
if (pFontDesc) {
LoadFontDescriptor(pFontDesc);
}
CPDF_Array* pWidthArray = m_pFontDict->GetArrayFor("Widths");
m_bUseFontWidth = !pWidthArray;
if (pWidthArray) {
if (pFontDesc && pFontDesc->KeyExist("MissingWidth")) {
int MissingWidth = pFontDesc->GetIntegerFor("MissingWidth");
for (int i = 0; i < 256; i++) {
m_CharWidth[i] = MissingWidth;
}
}
size_t width_start = m_pFontDict->GetIntegerFor("FirstChar", 0);
size_t width_end = m_pFontDict->GetIntegerFor("LastChar", 0);
if (width_start <= 255) {
if (width_end == 0 || width_end >= width_start + pWidthArray->GetCount())
width_end = width_start + pWidthArray->GetCount() - 1;
if (width_end > 255)
width_end = 255;
for (size_t i = width_start; i <= width_end; i++)
m_CharWidth[i] = pWidthArray->GetIntegerAt(i - width_start);
}
}
if (m_pFontFile) {
if (m_BaseFont.GetLength() > 8 && m_BaseFont[7] == '+')
m_BaseFont = m_BaseFont.Right(m_BaseFont.GetLength() - 8);
} else {
LoadSubstFont();
}
if (!FontStyleIsSymbolic(m_Flags))
m_BaseEncoding = PDFFONT_ENCODING_STANDARD;
CPDF_Object* pEncoding = m_pFontDict->GetDirectObjectFor("Encoding");
LoadPDFEncoding(pEncoding, m_BaseEncoding, &m_CharNames, !!m_pFontFile,
m_Font.IsTTFont());
LoadGlyphMap();
m_CharNames.clear();
if (!m_Font.GetFace())
return true;
if (FontStyleIsAllCaps(m_Flags)) {
unsigned char kLowercases[][2] = {{'a', 'z'}, {0xe0, 0xf6}, {0xf8, 0xfd}};
for (size_t range = 0; range < FX_ArraySize(kLowercases); ++range) {
const auto& lower = kLowercases[range];
for (int i = lower[0]; i <= lower[1]; ++i) {
if (m_GlyphIndex[i] != 0xffff && m_pFontFile)
continue;
int j = i - 32;
m_GlyphIndex[i] = m_GlyphIndex[j];
if (m_CharWidth[j]) {
m_CharWidth[i] = m_CharWidth[j];
m_CharBBox[i] = m_CharBBox[j];
}
}
}
}
CheckFontMetrics();
return true;
}
void CPDF_SimpleFont::LoadSubstFont() {
if (!m_bUseFontWidth && !FontStyleIsFixedPitch(m_Flags)) {
int width = 0, i;
for (i = 0; i < 256; i++) {
if (m_CharWidth[i] == 0 || m_CharWidth[i] == 0xffff)
continue;
if (width == 0)
width = m_CharWidth[i];
else if (width != m_CharWidth[i])
break;
}
if (i == 256 && width)
m_Flags |= FXFONT_FIXED_PITCH;
}
pdfium::base::CheckedNumeric<int> safeStemV(m_StemV);
if (m_StemV < 140)
safeStemV *= 5;
else
safeStemV = safeStemV * 4 + 140;
m_Font.LoadSubst(m_BaseFont, IsTrueTypeFont(), m_Flags,
safeStemV.ValueOrDefault(FXFONT_FW_NORMAL), m_ItalicAngle, 0,
false);
}
bool CPDF_SimpleFont::IsUnicodeCompatible() const {
return m_BaseEncoding != PDFFONT_ENCODING_BUILTIN &&
m_BaseEncoding != PDFFONT_ENCODING_ADOBE_SYMBOL &&
m_BaseEncoding != PDFFONT_ENCODING_ZAPFDINGBATS;
}
WideString CPDF_SimpleFont::UnicodeFromCharCode(uint32_t charcode) const {
WideString unicode = CPDF_Font::UnicodeFromCharCode(charcode);
if (!unicode.IsEmpty())
return unicode;
wchar_t ret = m_Encoding.UnicodeFromCharCode((uint8_t)charcode);
if (ret == 0)
return WideString();
return ret;
}
uint32_t CPDF_SimpleFont::CharCodeFromUnicode(wchar_t unicode) const {
uint32_t ret = CPDF_Font::CharCodeFromUnicode(unicode);
if (ret)
return ret;
return m_Encoding.CharCodeFromUnicode(unicode);
}
bool CPDF_SimpleFont::HasFontWidths() const {
return !m_bUseFontWidth;
}
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