// 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/include/fxge/fx_freetype.h"
#include "core/include/fxge/fx_ge.h"
#include "text_int.h"

#define EM_ADJUST(em, a) (em == 0 ? (a) : (a)*1000 / em)

namespace {

FXFT_Face FT_LoadFont(const uint8_t* pData, int size) {
  return CFX_GEModule::Get()->GetFontMgr()->GetFixedFace(pData, size, 0);
}

}  // namespace

CFX_Font::CFX_Font() {
  m_pSubstFont = NULL;
  m_Face = NULL;
  m_bEmbedded = FALSE;
  m_bVertical = FALSE;
  m_pFontData = NULL;
  m_pFontDataAllocation = NULL;
  m_dwSize = 0;
  m_pGsubData = NULL;
  m_pPlatformFont = NULL;
  m_pPlatformFontCollection = NULL;
  m_pDwFont = NULL;
  m_hHandle = NULL;
  m_bDwLoaded = FALSE;
}
CFX_Font::~CFX_Font() {
  delete m_pSubstFont;
  m_pSubstFont = NULL;
  FX_Free(m_pFontDataAllocation);
  m_pFontDataAllocation = NULL;
  if (m_Face) {
    if (FXFT_Get_Face_External_Stream(m_Face)) {
      FXFT_Clear_Face_External_Stream(m_Face);
    }
    if (m_bEmbedded) {
      DeleteFace();
    } else {
      CFX_GEModule::Get()->GetFontMgr()->ReleaseFace(m_Face);
    }
  }
  FX_Free(m_pGsubData);
  m_pGsubData = NULL;
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
  ReleasePlatformResource();
#endif
}
void CFX_Font::DeleteFace() {
  FXFT_Done_Face(m_Face);
  m_Face = NULL;
}
void CFX_Font::LoadSubst(const CFX_ByteString& face_name,
                         FX_BOOL bTrueType,
                         FX_DWORD flags,
                         int weight,
                         int italic_angle,
                         int CharsetCP,
                         FX_BOOL bVertical) {
  m_bEmbedded = FALSE;
  m_bVertical = bVertical;
  m_pSubstFont = new CFX_SubstFont;
  m_Face = CFX_GEModule::Get()->GetFontMgr()->FindSubstFont(
      face_name, bTrueType, flags, weight, italic_angle, CharsetCP,
      m_pSubstFont);
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
  if (m_pSubstFont->m_ExtHandle) {
    m_pPlatformFont = m_pSubstFont->m_ExtHandle;
    m_pSubstFont->m_ExtHandle = NULL;
  }
#endif
  if (m_Face) {
    m_pFontData = FXFT_Get_Face_Stream_Base(m_Face);
    m_dwSize = FXFT_Get_Face_Stream_Size(m_Face);
  }
}

int CFX_Font::GetGlyphWidth(FX_DWORD 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, FX_DWORD size) {
  m_pFontDataAllocation = FX_Alloc(uint8_t, size);
  FXSYS_memcpy(m_pFontDataAllocation, data, size);
  m_Face = FT_LoadFont(m_pFontDataAllocation, size);
  m_pFontData = m_pFontDataAllocation;
  m_bEmbedded = TRUE;
  m_dwSize = size;
  return m_Face != NULL;
}

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(FX_DWORD 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_WideString CFX_Font::GetPsName() const {
  if (!m_Face) {
    return CFX_WideString();
  }
  CFX_WideString psName =
      CFX_WideString::FromLocal(FXFT_Get_Postscript_Name(m_Face));
  if (psName.IsEmpty()) {
    psName = CFX_WideString::FromLocal("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));
}

CFX_UnicodeEncoding::CFX_UnicodeEncoding(CFX_Font* pFont) : m_pFont(pFont) {
}

CFX_UnicodeEncoding::~CFX_UnicodeEncoding() {
}

FX_DWORD CFX_UnicodeEncoding::GlyphFromCharCode(FX_DWORD charcode) {
  FXFT_Face face = m_pFont->GetFace();
  if (!face)
    return charcode;

  if (FXFT_Select_Charmap(face, FXFT_ENCODING_UNICODE) == 0)
    return FXFT_Get_Char_Index(face, charcode);

  if (m_pFont->GetSubstFont() && m_pFont->GetSubstFont()->m_Charset == 2) {
    FX_DWORD index = 0;
    if (FXFT_Select_Charmap(face, FXFT_ENCODING_MS_SYMBOL) == 0)
      index = FXFT_Get_Char_Index(face, charcode);
    if (!index && !FXFT_Select_Charmap(face, FXFT_ENCODING_APPLE_ROMAN))
      return FXFT_Get_Char_Index(face, charcode);
  }
  return charcode;
}