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

   1 /*
   2  * Copyright (c) 2009, Google Inc. All rights reserved.
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   4  * Redistribution and use in source and binary forms, with or without
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   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
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  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
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  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef FontFaceCreationParams_h
  32 #define FontFaceCreationParams_h
  33
  34 #include "wtf/Assertions.h"
  35 #include "wtf/StringHasher.h"
  36 #include "wtf/text/AtomicString.h"
  37 #include "wtf/text/StringHash.h"
  38
  39 namespace blink {
  40
  41 enum FontFaceCreationType {
  42     CreateFontByFamily,
  43     CreateFontByFciIdAndTtcIndex
  44 };
  45
  46 class FontFaceCreationParams {
  47     FontFaceCreationType m_creationType;
  48     AtomicString m_family;
  49     CString m_filename;
  50     int m_fontconfigInterfaceId;
  51     int m_ttcIndex;
  52
  53 public:
  54     FontFaceCreationParams()
  55         : m_creationType(CreateFontByFamily), m_family(AtomicString()), m_filename(CString()), m_fontconfigInterfaceId(0), m_ttcIndex(0)
  56     {
  57     }
  58
  59     explicit FontFaceCreationParams(AtomicString family)
  60         : m_creationType(CreateFontByFamily), m_family(family), m_filename(CString()), m_fontconfigInterfaceId(0), m_ttcIndex(0)
  61     {
  62 #if OS(WIN)
  63     // Leading "@" in the font name enables Windows vertical flow flag for the font.
  64     // Because we do vertical flow by ourselves, we don't want to use the Windows feature.
  65     // IE disregards "@" regardless of the orientation, so we follow the behavior and
  66     // normalize the family name.
  67     m_family = (m_family.isEmpty() || m_family[0] != '@') ? m_family : AtomicString(m_family.impl()->substring(1));
  68 #endif
  69     }
  70
  71     FontFaceCreationParams(CString filename, int fontconfigInterfaceId, int ttcIndex = 0)
  72         : m_creationType(CreateFontByFciIdAndTtcIndex), m_filename(filename), m_fontconfigInterfaceId(fontconfigInterfaceId), m_ttcIndex(ttcIndex)
  73     {
  74     }
  75
  76     FontFaceCreationType creationType() const { return m_creationType; }
  77     AtomicString family() const
  78     {
  79         ASSERT(m_creationType == CreateFontByFamily);
  80         return m_family;
  81     }
  82     CString filename() const
  83     {
  84         ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
  85         return m_filename;
  86     }
  87     int fontconfigInterfaceId() const
  88     {
  89         ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
  90         return m_fontconfigInterfaceId;
  91     }
  92     int ttcIndex() const
  93     {
  94         ASSERT(m_creationType == CreateFontByFciIdAndTtcIndex);
  95         return m_ttcIndex;
  96     }
  97
  98     unsigned hash() const
  99     {
 100         if (m_creationType == CreateFontByFciIdAndTtcIndex) {
 101             StringHasher hasher;
 102             // Hashing the filename and ints in this way is sensitive to character encoding
 103             // and endianness. However, since the hash is not transferred over a network
 104             // or permanently stored and only used for the runtime of Chromium,
 105             // this is not a concern.
 106             hasher.addCharacters(reinterpret_cast<const LChar*>(m_filename.data()), m_filename.length());
 107             hasher.addCharacters(reinterpret_cast<const LChar*>(&m_ttcIndex), sizeof(m_ttcIndex));
 108             hasher.addCharacters(reinterpret_cast<const LChar*>(&m_fontconfigInterfaceId), sizeof(m_fontconfigInterfaceId));
 109             return hasher.hash();
 110         }
 111         return CaseFoldingHash::hash(m_family.isEmpty() ? "" : m_family);
 112     }
 113
 114     bool operator==(const FontFaceCreationParams& other) const
 115     {
 116         return m_creationType == other.m_creationType
 117             && equalIgnoringCase(m_family, other.m_family)
 118             && m_filename == other.m_filename
 119             && m_fontconfigInterfaceId == other.m_fontconfigInterfaceId
 120             && m_ttcIndex == other.m_ttcIndex;
 121     }
 122
 123 };
 124
 125 } // namespace blink
 126
 127 #endif // FontFaceCreationParams_h