Move CFX_Font definition to its own file and clean up

- Rename fx_ge_font.cpp to cfx_font.cpp
- Deleted unused CONTRAST_RAMP_STEP in fx_ge_text.cpp
- Move CFX_Font definitions and auxiliary methods in fx_ge_text to cfx_font
- Remove extern "C", static, and underscore prefixes in new namespace
methods in cfx_font.cpp

Review-Url: https://codereview.chromium.org/2304493005

1 files changed, 667 insertions, 0 deletions

diff --git a/core/fxge/ge/cfx_font.cpp b/core/fxge/ge/cfx_font.cpp
new file mode 100644
index 0000000000..4aefec8d43
--- /dev/null
+++ b/core/fxge/ge/cfx_font.cpp
@@ -0,0 +1,667 @@
+// Copyright 2014 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/fxge/include/fx_font.h"
+
+#include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
+#include "core/fxge/ge/fx_text_int.h"
+#include "core/fxge/include/cfx_fontmgr.h"
+#include "core/fxge/include/cfx_gemodule.h"
+#include "core/fxge/include/cfx_pathdata.h"
+#include "core/fxge/include/cfx_substfont.h"
+#include "core/fxge/include/fx_freetype.h"
+
+#define EM_ADJUST(em, a) (em == 0 ? (a) : (a)*1000 / em)
+
+namespace {
+
+typedef struct {
+  FX_BOOL m_bCount;
+  int m_PointCount;
+  FX_PATHPOINT* m_pPoints;
+  int m_CurX;
+  int m_CurY;
+  FX_FLOAT m_CoordUnit;
+} OUTLINE_PARAMS;
+
+#ifdef PDF_ENABLE_XFA
+
+unsigned long FTStreamRead(FXFT_Stream stream,
+                           unsigned long offset,
+                           unsigned char* buffer,
+                           unsigned long count) {
+  if (count == 0)
+    return 0;
+
+  IFX_FileRead* pFile = static_cast<IFX_FileRead*>(stream->descriptor.pointer);
+  return pFile->ReadBlock(buffer, offset, count) ? count : 0;
+}
+
+void FTStreamClose(FXFT_Stream stream) {}
+
+FX_BOOL LoadFileImp(FXFT_Library library,
+                    FXFT_Face* Face,
+                    IFX_FileRead* pFile,
+                    int32_t faceIndex,
+                    std::unique_ptr<FXFT_StreamRec>* stream) {
+  std::unique_ptr<FXFT_StreamRec> stream1(new FXFT_StreamRec());
+  stream1->base = nullptr;
+  stream1->size = static_cast<unsigned long>(pFile->GetSize());
+  stream1->pos = 0;
+  stream1->descriptor.pointer = pFile;
+  stream1->close = FTStreamClose;
+  stream1->read = FTStreamRead;
+  FXFT_Open_Args args;
+  args.flags = FT_OPEN_STREAM;
+  args.stream = stream1.get();
+  if (FXFT_Open_Face(library, &args, faceIndex, Face))
+    return FALSE;
+  if (stream)
+    *stream = std::move(stream1);
+  return TRUE;
+}
+#endif  // PDF_ENABLE_XFA
+
+FXFT_Face FT_LoadFont(const uint8_t* pData, int size) {
+  return CFX_GEModule::Get()->GetFontMgr()->GetFixedFace(pData, size, 0);
+}
+
+void Outline_CheckEmptyContour(OUTLINE_PARAMS* param) {
+  if (param->m_PointCount >= 2 &&
+      param->m_pPoints[param->m_PointCount - 2].m_Flag == FXPT_MOVETO &&
+      param->m_pPoints[param->m_PointCount - 2].m_PointX ==
+          param->m_pPoints[param->m_PointCount - 1].m_PointX &&
+      param->m_pPoints[param->m_PointCount - 2].m_PointY ==
+          param->m_pPoints[param->m_PointCount - 1].m_PointY) {
+    param->m_PointCount -= 2;
+  }
+  if (param->m_PointCount >= 4 &&
+      param->m_pPoints[param->m_PointCount - 4].m_Flag == FXPT_MOVETO &&
+      param->m_pPoints[param->m_PointCount - 3].m_Flag == FXPT_BEZIERTO &&
+      param->m_pPoints[param->m_PointCount - 3].m_PointX ==
+          param->m_pPoints[param->m_PointCount - 4].m_PointX &&
+      param->m_pPoints[param->m_PointCount - 3].m_PointY ==
+          param->m_pPoints[param->m_PointCount - 4].m_PointY &&
+      param->m_pPoints[param->m_PointCount - 2].m_PointX ==
+          param->m_pPoints[param->m_PointCount - 4].m_PointX &&
+      param->m_pPoints[param->m_PointCount - 2].m_PointY ==
+          param->m_pPoints[param->m_PointCount - 4].m_PointY &&
+      param->m_pPoints[param->m_PointCount - 1].m_PointX ==
+          param->m_pPoints[param->m_PointCount - 4].m_PointX &&
+      param->m_pPoints[param->m_PointCount - 1].m_PointY ==
+          param->m_pPoints[param->m_PointCount - 4].m_PointY) {
+    param->m_PointCount -= 4;
+  }
+}
+
+int Outline_MoveTo(const FXFT_Vector* to, void* user) {
+  OUTLINE_PARAMS* param = (OUTLINE_PARAMS*)user;
+  if (!param->m_bCount) {
+    Outline_CheckEmptyContour(param);
+    param->m_pPoints[param->m_PointCount].m_PointX = to->x / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount].m_PointY = to->y / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount].m_Flag = FXPT_MOVETO;
+    param->m_CurX = to->x;
+    param->m_CurY = to->y;
+    if (param->m_PointCount)
+      param->m_pPoints[param->m_PointCount - 1].m_Flag |= FXPT_CLOSEFIGURE;
+  }
+  param->m_PointCount++;
+  return 0;
+}
+
+int Outline_LineTo(const FXFT_Vector* to, void* user) {
+  OUTLINE_PARAMS* param = (OUTLINE_PARAMS*)user;
+  if (!param->m_bCount) {
+    param->m_pPoints[param->m_PointCount].m_PointX = to->x / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount].m_PointY = to->y / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount].m_Flag = FXPT_LINETO;
+    param->m_CurX = to->x;
+    param->m_CurY = to->y;
+  }
+  param->m_PointCount++;
+  return 0;
+}
+
+int Outline_ConicTo(const FXFT_Vector* control,
+                    const FXFT_Vector* to,
+                    void* user) {
+  OUTLINE_PARAMS* param = (OUTLINE_PARAMS*)user;
+  if (!param->m_bCount) {
+    param->m_pPoints[param->m_PointCount].m_PointX =
+        (param->m_CurX + (control->x - param->m_CurX) * 2 / 3) /
+        param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount].m_PointY =
+        (param->m_CurY + (control->y - param->m_CurY) * 2 / 3) /
+        param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount].m_Flag = FXPT_BEZIERTO;
+    param->m_pPoints[param->m_PointCount + 1].m_PointX =
+        (control->x + (to->x - control->x) / 3) / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount + 1].m_PointY =
+        (control->y + (to->y - control->y) / 3) / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount + 1].m_Flag = FXPT_BEZIERTO;
+    param->m_pPoints[param->m_PointCount + 2].m_PointX =
+        to->x / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount + 2].m_PointY =
+        to->y / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount + 2].m_Flag = FXPT_BEZIERTO;
+    param->m_CurX = to->x;
+    param->m_CurY = to->y;
+  }
+  param->m_PointCount += 3;
+  return 0;
+}
+
+int Outline_CubicTo(const FXFT_Vector* control1,
+                    const FXFT_Vector* control2,
+                    const FXFT_Vector* to,
+                    void* user) {
+  OUTLINE_PARAMS* param = (OUTLINE_PARAMS*)user;
+  if (!param->m_bCount) {
+    param->m_pPoints[param->m_PointCount].m_PointX =
+        control1->x / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount].m_PointY =
+        control1->y / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount].m_Flag = FXPT_BEZIERTO;
+    param->m_pPoints[param->m_PointCount + 1].m_PointX =
+        control2->x / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount + 1].m_PointY =
+        control2->y / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount + 1].m_Flag = FXPT_BEZIERTO;
+    param->m_pPoints[param->m_PointCount + 2].m_PointX =
+        to->x / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount + 2].m_PointY =
+        to->y / param->m_CoordUnit;
+    param->m_pPoints[param->m_PointCount + 2].m_Flag = FXPT_BEZIERTO;
+    param->m_CurX = to->x;
+    param->m_CurY = to->y;
+  }
+  param->m_PointCount += 3;
+  return 0;
+}
+
+}  // namespace
+
+const char CFX_Font::s_AngleSkew[] = {
+    0,  2,  3,  5,  7,  9,  11, 12, 14, 16, 18, 19, 21, 23, 25,
+    27, 29, 31, 32, 34, 36, 38, 40, 42, 45, 47, 49, 51, 53, 55,
+};
+
+const uint8_t CFX_Font::s_WeightPow[] = {
+    0,  3,  6,  7,  8,  9,  11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22,
+    23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 35, 36, 36, 37,
+    37, 37, 38, 38, 38, 39, 39, 39, 40, 40, 40, 41, 41, 41, 42, 42, 42,
+    42, 43, 43, 43, 44, 44, 44, 44, 45, 45, 45, 45, 46, 46, 46, 46, 47,
+    47, 47, 47, 48, 48, 48, 48, 48, 49, 49, 49, 49, 50, 50, 50, 50, 50,
+    51, 51, 51, 51, 51, 52, 52, 52, 52, 52, 53, 53, 53, 53, 53,
+};
+
+const uint8_t CFX_Font::s_WeightPow_11[] = {
+    0,  4,  7,  8,  9,  10, 12, 13, 15, 17, 18, 19, 20, 21, 22, 23, 24,
+    25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, 39, 40, 40, 41,
+    41, 41, 42, 42, 42, 43, 43, 43, 44, 44, 44, 45, 45, 45, 46, 46, 46,
+    46, 43, 47, 47, 48, 48, 48, 48, 45, 50, 50, 50, 46, 51, 51, 51, 52,
+    52, 52, 52, 53, 53, 53, 53, 53, 54, 54, 54, 54, 55, 55, 55, 55, 55,
+    56, 56, 56, 56, 56, 57, 57, 57, 57, 57, 58, 58, 58, 58, 58,
+};
+
+const uint8_t CFX_Font::s_WeightPow_SHIFTJIS[] = {
+    0,  0,  1,  2,  3,  4,  5,  7,  8,  10, 11, 13, 14, 16, 17, 19, 21,
+    22, 24, 26, 28, 30, 32, 33, 35, 37, 39, 41, 43, 45, 48, 48, 48, 48,
+    49, 49, 49, 50, 50, 50, 50, 51, 51, 51, 51, 52, 52, 52, 52, 52, 53,
+    53, 53, 53, 53, 54, 54, 54, 54, 54, 55, 55, 55, 55, 55, 56, 56, 56,
+    56, 56, 56, 57, 57, 57, 57, 57, 57, 57, 58, 58, 58, 58, 58, 58, 58,
+    59, 59, 59, 59, 59, 59, 59, 60, 60, 60, 60, 60, 60, 60, 60,
+};
+
+CFX_Font::CFX_Font()
+    :
+#ifdef PDF_ENABLE_XFA
+      m_bLogic(FALSE),
+      m_pOwnedStream(nullptr),
+#endif  // PDF_ENABLE_XFA
+      m_Face(nullptr),
+      m_pFontData(nullptr),
+      m_pGsubData(nullptr),
+      m_dwSize(0),
+#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
+      m_pPlatformFont(nullptr),
+#endif
+      m_bEmbedded(FALSE),
+      m_bVertical(FALSE) {
+}
+
+#ifdef PDF_ENABLE_XFA
+FX_BOOL CFX_Font::LoadClone(const CFX_Font* pFont) {
+  if (!pFont)
+    return FALSE;
+
+  m_bLogic = TRUE;
+  if (pFont->m_pSubstFont) {
+    m_pSubstFont.reset(new CFX_SubstFont);
+    m_pSubstFont->m_Charset = pFont->m_pSubstFont->m_Charset;
+    m_pSubstFont->m_SubstFlags = pFont->m_pSubstFont->m_SubstFlags;
+    m_pSubstFont->m_Weight = pFont->m_pSubstFont->m_Weight;
+    m_pSubstFont->m_Family = pFont->m_pSubstFont->m_Family;
+    m_pSubstFont->m_ItalicAngle = pFont->m_pSubstFont->m_ItalicAngle;
+  }
+  if (pFont->m_OtfFontData.GetSize()) {
+    m_OtfFontData.AttachData(pFont->m_OtfFontData.GetBuffer(),
+                             pFont->m_OtfFontData.GetSize());
+  }
+  m_Face = pFont->m_Face;
+  m_bEmbedded = pFont->m_bEmbedded;
+  m_bVertical = pFont->m_bVertical;
+  m_dwSize = pFont->m_dwSize;
+  m_pFontData = pFont->m_pFontData;
+  m_pGsubData = pFont->m_pGsubData;
+#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
+  m_pPlatformFont = pFont->m_pPlatformFont;
+#endif
+  m_pOwnedStream = pFont->m_pOwnedStream;
+  return TRUE;
+}
+#endif  // PDF_ENABLE_XFA
+
+CFX_Font::~CFX_Font() {
+#ifdef PDF_ENABLE_XFA
+  if (m_bLogic) {
+    m_OtfFontData.DetachBuffer();
+    return;
+  }
+#endif  // PDF_ENABLE_XFA
+  if (m_Face) {
+#ifndef PDF_ENABLE_XFA
+    if (FXFT_Get_Face_External_Stream(m_Face)) {
+      FXFT_Clear_Face_External_Stream(m_Face);
+    }
+#endif  // PDF_ENABLE_XFA
+    if (m_bEmbedded)
+      DeleteFace();
+    else
+      CFX_GEModule::Get()->GetFontMgr()->ReleaseFace(m_Face);
+  }
+#ifdef PDF_ENABLE_XFA
+  FX_Free(m_pOwnedStream);
+#endif  // PDF_ENABLE_XFA
+  FX_Free(m_pGsubData);
+#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_ && !defined _SKIA_SUPPORT_
+  ReleasePlatformResource();
+#endif
+}
+
+void CFX_Font::DeleteFace() {
+  FXFT_Done_Face(m_Face);
+  m_Face = nullptr;
+}
+
+void CFX_Font::LoadSubst(const CFX_ByteString& face_name,
+                         FX_BOOL bTrueType,
+                         uint32_t flags,
+                         int weight,
+                         int italic_angle,
+                         int CharsetCP,
+                         FX_BOOL bVertical) {
+  m_bEmbedded = FALSE;
+  m_bVertical = bVertical;
+  m_pSubstFont.reset(new CFX_SubstFont);
+  m_Face = CFX_GEModule::Get()->GetFontMgr()->FindSubstFont(
+      face_name, bTrueType, flags, weight, italic_angle, CharsetCP,
+      m_pSubstFont.get());
+  if (m_Face) {
+    m_pFontData = FXFT_Get_Face_Stream_Base(m_Face);
+    m_dwSize = FXFT_Get_Face_Stream_Size(m_Face);
+  }
+}
+
+#ifdef PDF_ENABLE_XFA
+FX_BOOL CFX_Font::LoadFile(IFX_FileRead* pFile,
+                           int nFaceIndex,
+                           int* pFaceCount) {
+  m_bEmbedded = FALSE;
+
+  CFX_FontMgr* pFontMgr = CFX_GEModule::Get()->GetFontMgr();
+  pFontMgr->InitFTLibrary();
+  FXFT_Library library = pFontMgr->GetFTLibrary();
+
+  std::unique_ptr<FXFT_StreamRec> stream;
+  if (!LoadFileImp(library, &m_Face, pFile, nFaceIndex, &stream))
+    return FALSE;
+
+  if (pFaceCount)
+    *pFaceCount = (int)m_Face->num_faces;
+  m_pOwnedStream = stream.release();
+  FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
+  return TRUE;
+}
+#endif  // PDF_ENABLE_XFA
+
+int CFX_Font::GetGlyphWidth(uint32_t glyph_index) {
+  if (!m_Face)
+    return 0;
+  if (m_pSubstFont && (m_pSubstFont->m_SubstFlags & FXFONT_SUBST_MM))
+    AdjustMMParams(glyph_index, 0, 0);
+  int err = FXFT_Load_Glyph(
+      m_Face, glyph_index,
+      FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
+  if (err)
+    return 0;
+  int width = EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
+                        FXFT_Get_Glyph_HoriAdvance(m_Face));
+  return width;
+}
+
+FX_BOOL CFX_Font::LoadEmbedded(const uint8_t* data, uint32_t size) {
+  std::vector<uint8_t> temp(data, data + size);
+  m_pFontDataAllocation.swap(temp);
+  m_Face = FT_LoadFont(m_pFontDataAllocation.data(), size);
+  m_pFontData = m_pFontDataAllocation.data();
+  m_bEmbedded = TRUE;
+  m_dwSize = size;
+  return !!m_Face;
+}
+
+FX_BOOL CFX_Font::IsTTFont() const {
+  if (!m_Face)
+    return FALSE;
+  return FXFT_Is_Face_TT_OT(m_Face) == FXFT_FACE_FLAG_SFNT;
+}
+
+int CFX_Font::GetAscent() const {
+  if (!m_Face)
+    return 0;
+  return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
+                   FXFT_Get_Face_Ascender(m_Face));
+}
+
+int CFX_Font::GetDescent() const {
+  if (!m_Face)
+    return 0;
+  return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
+                   FXFT_Get_Face_Descender(m_Face));
+}
+
+FX_BOOL CFX_Font::GetGlyphBBox(uint32_t glyph_index, FX_RECT& bbox) {
+  if (!m_Face)
+    return FALSE;
+
+  if (FXFT_Is_Face_Tricky(m_Face)) {
+    int error = FXFT_Set_Char_Size(m_Face, 0, 1000 * 64, 72, 72);
+    if (error)
+      return FALSE;
+    error = FXFT_Load_Glyph(m_Face, glyph_index,
+                            FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
+    if (error)
+      return FALSE;
+    FXFT_BBox cbox;
+    FT_Glyph glyph;
+    error = FXFT_Get_Glyph(((FXFT_Face)m_Face)->glyph, &glyph);
+    if (error)
+      return FALSE;
+    FXFT_Glyph_Get_CBox(glyph, FXFT_GLYPH_BBOX_PIXELS, &cbox);
+    int pixel_size_x = ((FXFT_Face)m_Face)->size->metrics.x_ppem,
+        pixel_size_y = ((FXFT_Face)m_Face)->size->metrics.y_ppem;
+    if (pixel_size_x == 0 || pixel_size_y == 0) {
+      bbox.left = cbox.xMin;
+      bbox.right = cbox.xMax;
+      bbox.top = cbox.yMax;
+      bbox.bottom = cbox.yMin;
+    } else {
+      bbox.left = cbox.xMin * 1000 / pixel_size_x;
+      bbox.right = cbox.xMax * 1000 / pixel_size_x;
+      bbox.top = cbox.yMax * 1000 / pixel_size_y;
+      bbox.bottom = cbox.yMin * 1000 / pixel_size_y;
+    }
+    if (bbox.top > FXFT_Get_Face_Ascender(m_Face))
+      bbox.top = FXFT_Get_Face_Ascender(m_Face);
+    if (bbox.bottom < FXFT_Get_Face_Descender(m_Face))
+      bbox.bottom = FXFT_Get_Face_Descender(m_Face);
+    FT_Done_Glyph(glyph);
+    return FXFT_Set_Pixel_Sizes(m_Face, 0, 64) == 0;
+  }
+  if (FXFT_Load_Glyph(
+          m_Face, glyph_index,
+          FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
+    return FALSE;
+  }
+  int em = FXFT_Get_Face_UnitsPerEM(m_Face);
+  if (em == 0) {
+    bbox.left = FXFT_Get_Glyph_HoriBearingX(m_Face);
+    bbox.bottom = FXFT_Get_Glyph_HoriBearingY(m_Face);
+    bbox.top = bbox.bottom - FXFT_Get_Glyph_Height(m_Face);
+    bbox.right = bbox.left + FXFT_Get_Glyph_Width(m_Face);
+  } else {
+    bbox.left = FXFT_Get_Glyph_HoriBearingX(m_Face) * 1000 / em;
+    bbox.top =
+        (FXFT_Get_Glyph_HoriBearingY(m_Face) - FXFT_Get_Glyph_Height(m_Face)) *
+        1000 / em;
+    bbox.right =
+        (FXFT_Get_Glyph_HoriBearingX(m_Face) + FXFT_Get_Glyph_Width(m_Face)) *
+        1000 / em;
+    bbox.bottom = (FXFT_Get_Glyph_HoriBearingY(m_Face)) * 1000 / em;
+  }
+  return TRUE;
+}
+
+FX_BOOL CFX_Font::IsItalic() const {
+  if (!m_Face)
+    return FALSE;
+
+  FX_BOOL ret = FXFT_Is_Face_Italic(m_Face) == FXFT_STYLE_FLAG_ITALIC;
+  if (!ret) {
+    CFX_ByteString str(FXFT_Get_Face_Style_Name(m_Face));
+    str.MakeLower();
+    if (str.Find("italic") != -1)
+      ret = TRUE;
+  }
+  return ret;
+}
+
+FX_BOOL CFX_Font::IsBold() const {
+  if (!m_Face)
+    return FALSE;
+  return FXFT_Is_Face_Bold(m_Face) == FXFT_STYLE_FLAG_BOLD;
+}
+
+FX_BOOL CFX_Font::IsFixedWidth() const {
+  if (!m_Face)
+    return FALSE;
+  return FXFT_Is_Face_fixedwidth(m_Face);
+}
+
+CFX_ByteString CFX_Font::GetPsName() const {
+  if (!m_Face)
+    return CFX_ByteString();
+
+  CFX_ByteString psName = FXFT_Get_Postscript_Name(m_Face);
+  if (psName.IsEmpty())
+    psName = "Untitled";
+  return psName;
+}
+
+CFX_ByteString CFX_Font::GetFamilyName() const {
+  if (!m_Face && !m_pSubstFont)
+    return CFX_ByteString();
+  if (m_Face)
+    return CFX_ByteString(FXFT_Get_Face_Family_Name(m_Face));
+  return m_pSubstFont->m_Family;
+}
+
+CFX_ByteString CFX_Font::GetFaceName() const {
+  if (!m_Face && !m_pSubstFont)
+    return CFX_ByteString();
+  if (m_Face) {
+    CFX_ByteString facename;
+    CFX_ByteString style = CFX_ByteString(FXFT_Get_Face_Style_Name(m_Face));
+    facename = GetFamilyName();
+    if (facename.IsEmpty())
+      facename = "Untitled";
+    if (!style.IsEmpty() && style != "Regular")
+      facename += " " + style;
+    return facename;
+  }
+  return m_pSubstFont->m_Family;
+}
+
+FX_BOOL CFX_Font::GetBBox(FX_RECT& bbox) {
+  if (!m_Face)
+    return FALSE;
+  int em = FXFT_Get_Face_UnitsPerEM(m_Face);
+  if (em == 0) {
+    bbox.left = FXFT_Get_Face_xMin(m_Face);
+    bbox.bottom = FXFT_Get_Face_yMax(m_Face);
+    bbox.top = FXFT_Get_Face_yMin(m_Face);
+    bbox.right = FXFT_Get_Face_xMax(m_Face);
+  } else {
+    bbox.left = FXFT_Get_Face_xMin(m_Face) * 1000 / em;
+    bbox.top = FXFT_Get_Face_yMin(m_Face) * 1000 / em;
+    bbox.right = FXFT_Get_Face_xMax(m_Face) * 1000 / em;
+    bbox.bottom = FXFT_Get_Face_yMax(m_Face) * 1000 / em;
+  }
+  return TRUE;
+}
+
+int CFX_Font::GetHeight() const {
+  if (!m_Face)
+    return 0;
+
+  return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
+                   FXFT_Get_Face_Height(m_Face));
+}
+
+int CFX_Font::GetMaxAdvanceWidth() const {
+  if (!m_Face)
+    return 0;
+
+  return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
+                   FXFT_Get_Face_MaxAdvanceWidth(m_Face));
+}
+
+int CFX_Font::GetULPos() const {
+  if (!m_Face)
+    return 0;
+
+  return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
+                   FXFT_Get_Face_UnderLinePosition(m_Face));
+}
+
+int CFX_Font::GetULthickness() const {
+  if (!m_Face)
+    return 0;
+
+  return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
+                   FXFT_Get_Face_UnderLineThickness(m_Face));
+}
+
+void CFX_Font::AdjustMMParams(int glyph_index, int dest_width, int weight) {
+  FXFT_MM_Var pMasters = nullptr;
+  FXFT_Get_MM_Var(m_Face, &pMasters);
+  if (!pMasters)
+    return;
+  long coords[2];
+  if (weight == 0)
+    coords[0] = FXFT_Get_MM_Axis_Def(FXFT_Get_MM_Axis(pMasters, 0)) / 65536;
+  else
+    coords[0] = weight;
+  if (dest_width == 0) {
+    coords[1] = FXFT_Get_MM_Axis_Def(FXFT_Get_MM_Axis(pMasters, 1)) / 65536;
+  } else {
+    int min_param = FXFT_Get_MM_Axis_Min(FXFT_Get_MM_Axis(pMasters, 1)) / 65536;
+    int max_param = FXFT_Get_MM_Axis_Max(FXFT_Get_MM_Axis(pMasters, 1)) / 65536;
+    coords[1] = min_param;
+    FXFT_Set_MM_Design_Coordinates(m_Face, 2, coords);
+    FXFT_Load_Glyph(m_Face, glyph_index,
+                    FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
+    int min_width = FXFT_Get_Glyph_HoriAdvance(m_Face) * 1000 /
+                    FXFT_Get_Face_UnitsPerEM(m_Face);
+    coords[1] = max_param;
+    FXFT_Set_MM_Design_Coordinates(m_Face, 2, coords);
+    FXFT_Load_Glyph(m_Face, glyph_index,
+                    FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
+    int max_width = FXFT_Get_Glyph_HoriAdvance(m_Face) * 1000 /
+                    FXFT_Get_Face_UnitsPerEM(m_Face);
+    if (max_width == min_width) {
+      FXFT_Free(m_Face, pMasters);
+      return;
+    }
+    int param = min_param +
+                (max_param - min_param) * (dest_width - min_width) /
+                    (max_width - min_width);
+    coords[1] = param;
+  }
+  FXFT_Free(m_Face, pMasters);
+  FXFT_Set_MM_Design_Coordinates(m_Face, 2, coords);
+}
+
+CFX_PathData* CFX_Font::LoadGlyphPath(uint32_t glyph_index, int dest_width) {
+  if (!m_Face)
+    return nullptr;
+  FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
+  FXFT_Matrix ft_matrix = {65536, 0, 0, 65536};
+  if (m_pSubstFont) {
+    if (m_pSubstFont->m_ItalicAngle) {
+      int skew = m_pSubstFont->m_ItalicAngle;
+      // |skew| is nonpositive so |-skew| is used as the index. We need to make
+      // sure |skew| != INT_MIN since -INT_MIN is undefined.
+      if (skew <= 0 && skew != std::numeric_limits<int>::min() &&
+          static_cast<size_t>(-skew) < kAngleSkewArraySize) {
+        skew = -s_AngleSkew[-skew];
+      } else {
+        skew = -58;
+      }
+      if (m_bVertical)
+        ft_matrix.yx += ft_matrix.yy * skew / 100;
+      else
+        ft_matrix.xy -= ft_matrix.xx * skew / 100;
+    }
+    if (m_pSubstFont->m_SubstFlags & FXFONT_SUBST_MM) {
+      AdjustMMParams(glyph_index, dest_width, m_pSubstFont->m_Weight);
+    }
+  }
+  ScopedFontTransform scoped_transform(m_Face, &ft_matrix);
+  int load_flags = FXFT_LOAD_NO_BITMAP;
+  if (!(m_Face->face_flags & FT_FACE_FLAG_SFNT) || !FT_IS_TRICKY(m_Face))
+    load_flags |= FT_LOAD_NO_HINTING;
+  if (FXFT_Load_Glyph(m_Face, glyph_index, load_flags))
+    return nullptr;
+  if (m_pSubstFont && !(m_pSubstFont->m_SubstFlags & FXFONT_SUBST_MM) &&
+      m_pSubstFont->m_Weight > 400) {
+    uint32_t index = (m_pSubstFont->m_Weight - 400) / 10;
+    index = std::min(index, static_cast<uint32_t>(kWeightPowArraySize - 1));
+    int level = 0;
+    if (m_pSubstFont->m_Charset == FXFONT_SHIFTJIS_CHARSET)
+      level = s_WeightPow_SHIFTJIS[index] * 2 * 65536 / 36655;
+    else
+      level = s_WeightPow[index] * 2;
+    FXFT_Outline_Embolden(FXFT_Get_Glyph_Outline(m_Face), level);
+  }
+  FXFT_Outline_Funcs funcs;
+  funcs.move_to = Outline_MoveTo;
+  funcs.line_to = Outline_LineTo;
+  funcs.conic_to = Outline_ConicTo;
+  funcs.cubic_to = Outline_CubicTo;
+  funcs.shift = 0;
+  funcs.delta = 0;
+  OUTLINE_PARAMS params;
+  params.m_bCount = TRUE;
+  params.m_PointCount = 0;
+  FXFT_Outline_Decompose(FXFT_Get_Glyph_Outline(m_Face), &funcs, &params);
+  if (params.m_PointCount == 0)
+    return nullptr;
+  CFX_PathData* pPath = new CFX_PathData;
+  pPath->SetPointCount(params.m_PointCount);
+  params.m_bCount = FALSE;
+  params.m_PointCount = 0;
+  params.m_pPoints = pPath->GetPoints();
+  params.m_CurX = params.m_CurY = 0;
+  params.m_CoordUnit = 64 * 64.0;
+  FXFT_Outline_Decompose(FXFT_Get_Glyph_Outline(m_Face), &funcs, &params);
+  Outline_CheckEmptyContour(&params);
+  pPath->TrimPoints(params.m_PointCount);
+  if (params.m_PointCount)
+    pPath->GetPoints()[params.m_PointCount - 1].m_Flag |= FXPT_CLOSEFIGURE;
+  return pPath;
+}