third_party/WebKit/Source/platform/fonts/FontFaceCreationParams.h

/*
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#ifndef FontFaceCreationParams_h
#define FontFaceCreationParams_h

#include "wtf/Allocator.h"
#include "wtf/Assertions.h"
#include "wtf/StringHasher.h"
#include "wtf/text/AtomicString.h"
#include "wtf/text/StringHash.h"

namespace blink {

enum FontFaceCreationType { CreateFontByFamily, CreateFontByFciIdAndTtcIndex };

class FontFaceCreationParams {
  USING_FAST_MALLOC(FontFaceCreationParams);

 public:
  FontFaceCreationParams()
      : m_creationType(CreateFontByFamily),
        m_family(AtomicString()),
        m_filename(CString()),
        m_fontconfigInterfaceId(0),
        m_ttcIndex(0) {}

  explicit FontFaceCreationParams(AtomicString family)
      : m_creationType(CreateFontByFamily),
        m_family(family),
        m_filename(CString()),
        m_fontconfigInterfaceId(0),
        m_ttcIndex(0) {
#if OS(WIN)
    // Leading "@" in the font name enables Windows vertical flow flag for the
    // font.  Because we do vertical flow by ourselves, we don't want to use the
    // Windows feature.  IE disregards "@" regardless of the orientation, so we
    // follow the behavior and normalize the family name.
    m_family = (m_family.isEmpty() || m_family[0] != '@')
                   ? m_family
                   : AtomicString(m_family.impl()->substring(1));
#endif
  }

  FontFaceCreationParams(CString filename,
                         int fontconfigInterfaceId,
                         int ttcIndex = 0)
      : m_creationType(CreateFontByFciIdAndTtcIndex),
        m_filename(filename),
        m_fontconfigInterfaceId(fontconfigInterfaceId),
        m_ttcIndex(ttcIndex) {}

  FontFaceCreationType creationType() const { return m_creationType; }
  AtomicString family() const {
    ASSERT(m_creationType == CreateFontByFamily);
    return m_family;
  }
  CString filename() const {
    ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
    return m_filename;
  }
  int fontconfigInterfaceId() const {
    ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
    return m_fontconfigInterfaceId;
  }
  int ttcIndex() const {
    ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
    return m_ttcIndex;
  }

  unsigned hash() const {
    if (m_creationType == CreateFontByFciIdAndTtcIndex) {
      StringHasher hasher;
      // Hashing the filename and ints in this way is sensitive to character
      // encoding and endianness. However, since the hash is not transferred
      // over a network or permanently stored and only used for the runtime of
      // Chromium, this is not a concern.
      hasher.addCharacters(reinterpret_cast<const LChar*>(m_filename.data()),
                           m_filename.length());
      hasher.addCharacters(reinterpret_cast<const LChar*>(&m_ttcIndex),
                           sizeof(m_ttcIndex));
      hasher.addCharacters(
          reinterpret_cast<const LChar*>(&m_fontconfigInterfaceId),
          sizeof(m_fontconfigInterfaceId));
      return hasher.hash();
    }
    return CaseFoldingHash::hash(m_family.isEmpty() ? "" : m_family);
  }

  bool operator==(const FontFaceCreationParams& other) const {
    return m_creationType == other.m_creationType &&
           equalIgnoringCase(m_family, other.m_family) &&
           m_filename == other.m_filename &&
           m_fontconfigInterfaceId == other.m_fontconfigInterfaceId &&
           m_ttcIndex == other.m_ttcIndex;
  }

 private:
  FontFaceCreationType m_creationType;
  AtomicString m_family;
  CString m_filename;
  int m_fontconfigInterfaceId;
  int m_ttcIndex;
};

}  // namespace blink

#endif  // FontFaceCreationParams_h