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

BUG=pdfium:603

Review-Url: https://codereview.chromium.org/2392773003

1 files changed, 216 insertions, 0 deletions

diff --git a/core/fpdfapi/font/cpdf_simplefont.cpp b/core/fpdfapi/font/cpdf_simplefont.cpp
new file mode 100644
index 0000000000..b596cf0036
--- /dev/null
+++ b/core/fpdfapi/font/cpdf_simplefont.cpp
@@ -0,0 +1,216 @@
+// 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/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);
+}