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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/fpdf_font/cpdf_simplefont.h"
#include "core/fpdfapi/fpdf_font/font_int.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
#include "core/fxge/include/fx_freetype.h"
CPDF_SimpleFont::CPDF_SimpleFont()
: m_pCharNames(nullptr), m_BaseEncoding(PDFFONT_ENCODING_BUILTIN) {
FXSYS_memset(m_CharWidth, 0xff, sizeof m_CharWidth);
FXSYS_memset(m_GlyphIndex, 0xff, sizeof m_GlyphIndex);
FXSYS_memset(m_ExtGID, 0xff, sizeof m_ExtGID);
}
CPDF_SimpleFont::~CPDF_SimpleFont() {
delete[] m_pCharNames;
}
int CPDF_SimpleFont::GlyphFromCharCode(uint32_t charcode, FX_BOOL* pVertGlyph) {
if (pVertGlyph) {
*pVertGlyph = FALSE;
}
if (charcode > 0xff) {
return -1;
}
int index = m_GlyphIndex[(uint8_t)charcode];
if (index == 0xffff) {
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;
}
m_CharBBox[charcode] = FX_SMALL_RECT(
TT2PDF(FXFT_Get_Glyph_HoriBearingX(face), face),
TT2PDF(FXFT_Get_Glyph_HoriBearingY(face), face),
TT2PDF(FXFT_Get_Glyph_HoriBearingX(face) + FXFT_Get_Glyph_Width(face),
face),
TT2PDF(FXFT_Get_Glyph_HoriBearingY(face) - 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;
}
}
}
int CPDF_SimpleFont::GetCharWidthF(uint32_t charcode, int level) {
if (charcode > 0xff) {
charcode = 0;
}
if (m_CharWidth[charcode] == 0xffff) {
LoadCharMetrics(charcode);
if (m_CharWidth[charcode] == 0xffff) {
m_CharWidth[charcode] = 0;
}
}
return (int16_t)m_CharWidth[charcode];
}
FX_RECT CPDF_SimpleFont::GetCharBBox(uint32_t charcode, int level) {
if (charcode > 0xff)
charcode = 0;
if (m_CharBBox[charcode].left == FX_SMALL_RECT::kInvalid)
LoadCharMetrics(charcode);
return FX_RECT(m_CharBBox[charcode]);
}
FX_BOOL CPDF_SimpleFont::LoadCommon() {
CPDF_Dictionary* pFontDesc = m_pFontDict->GetDictBy("FontDescriptor");
if (pFontDesc) {
LoadFontDescriptor(pFontDesc);
}
CPDF_Array* pWidthArray = m_pFontDict->GetArrayBy("Widths");
m_bUseFontWidth = TRUE;
if (pWidthArray) {
m_bUseFontWidth = FALSE;
if (pFontDesc && pFontDesc->KeyExist("MissingWidth")) {
int MissingWidth = pFontDesc->GetIntegerBy("MissingWidth");
for (int i = 0; i < 256; i++) {
m_CharWidth[i] = MissingWidth;
}
}
size_t width_start = m_pFontDict->GetIntegerBy("FirstChar", 0);
size_t width_end = m_pFontDict->GetIntegerBy("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.Mid(8);
}
} else {
LoadSubstFont();
}
if (!(m_Flags & PDFFONT_SYMBOLIC)) {
m_BaseEncoding = PDFFONT_ENCODING_STANDARD;
}
CPDF_Object* pEncoding = m_pFontDict->GetDirectObjectBy("Encoding");
LoadPDFEncoding(pEncoding, m_BaseEncoding, m_pCharNames, m_pFontFile != NULL,
m_Font.IsTTFont());
LoadGlyphMap();
delete[] m_pCharNames;
m_pCharNames = NULL;
if (!m_Font.GetFace())
return TRUE;
if (m_Flags & PDFFONT_ALLCAP) {
unsigned char lowercases[] = {'a', 'z', 0xe0, 0xf6, 0xf8, 0xfd};
for (size_t range = 0; range < sizeof lowercases / 2; range++) {
for (int i = lowercases[range * 2]; i <= lowercases[range * 2 + 1]; i++) {
if (m_GlyphIndex[i] != 0xffff && m_pFontFile) {
continue;
}
m_GlyphIndex[i] = m_GlyphIndex[i - 32];
if (m_CharWidth[i - 32]) {
m_CharWidth[i] = m_CharWidth[i - 32];
m_CharBBox[i] = m_CharBBox[i - 32];
}
}
}
}
CheckFontMetrics();
return TRUE;
}
void CPDF_SimpleFont::LoadSubstFont() {
if (!m_bUseFontWidth && !(m_Flags & PDFFONT_FIXEDPITCH)) {
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 |= PDFFONT_FIXEDPITCH;
}
}
int weight = m_StemV < 140 ? m_StemV * 5 : (m_StemV * 4 + 140);
m_Font.LoadSubst(m_BaseFont, IsTrueTypeFont(), m_Flags, weight, m_ItalicAngle,
0);
if (m_Font.GetSubstFont()->m_SubstFlags & FXFONT_SUBST_NONSYMBOL) {
}
}
FX_BOOL CPDF_SimpleFont::IsUnicodeCompatible() const {
return m_BaseEncoding != PDFFONT_ENCODING_BUILTIN &&
m_BaseEncoding != PDFFONT_ENCODING_ADOBE_SYMBOL &&
m_BaseEncoding != PDFFONT_ENCODING_ZAPFDINGBATS;
}
CFX_WideString CPDF_SimpleFont::UnicodeFromCharCode(uint32_t charcode) const {
CFX_WideString unicode = CPDF_Font::UnicodeFromCharCode(charcode);
if (!unicode.IsEmpty())
return unicode;
FX_WCHAR ret = m_Encoding.UnicodeFromCharCode((uint8_t)charcode);
if (ret == 0)
return CFX_WideString();
return ret;
}
uint32_t CPDF_SimpleFont::CharCodeFromUnicode(FX_WCHAR unicode) const {
uint32_t ret = CPDF_Font::CharCodeFromUnicode(unicode);
if (ret)
return ret;
return m_Encoding.CharCodeFromUnicode(unicode);
}
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