Move core/fpdfapi/fpdf_font to core/fpdfapi/font

core/fpdfapi/fpdf_font/cpdf_simplefont.cpp

-// 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/cpdf_array.h"
-#include "core/fpdfapi/fpdf_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) {
-  FXSYS_memset(m_CharWidth, 0xff, sizeof(m_CharWidth));
-  FXSYS_memset(m_GlyphIndex, 0xff, sizeof(m_GlyphIndex));
-  FXSYS_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[(uint8_t)charcode];
-  return index != 0xffff ? index : -1;
-}
-
-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;
-    }
-  }
-}
-
-int 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.Mid(8);
-    }
-  } else {
-    LoadSubstFont();
-  }
-  if (!(m_Flags & PDFFONT_SYMBOLIC)) {
-    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 (m_Flags & PDFFONT_ALLCAP) {
-    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 && !(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;
-    }
-  }
-  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;
-}
-
-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);
-}