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

   1 /*
   2  * Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef FontFamily_h
  27 #define FontFamily_h
  28
  29 #include "platform/PlatformExport.h"
  30 #include "wtf/RefCounted.h"
  31 #include "wtf/RefPtr.h"
  32 #include "wtf/text/AtomicString.h"
  33
  34 namespace blink {
  35
  36 class SharedFontFamily;
  37
  38 class PLATFORM_EXPORT FontFamily {
  39 public:
  40     FontFamily() { }
  41     ~FontFamily();
  42
  43     void setFamily(const AtomicString& family) { m_family = family; }
  44     const AtomicString& family() const { return m_family; }
  45     bool familyIsEmpty() const { return m_family.isEmpty(); }
  46
  47     const FontFamily* next() const;
  48
  49     void appendFamily(PassRefPtr<SharedFontFamily>);
  50     PassRefPtr<SharedFontFamily> releaseNext();
  51
  52 private:
  53     AtomicString m_family;
  54     RefPtr<SharedFontFamily> m_next;
  55 };
  56
  57 class PLATFORM_EXPORT SharedFontFamily : public FontFamily, public RefCounted<SharedFontFamily> {
  58 public:
  59     static PassRefPtr<SharedFontFamily> create()
  60     {
  61         return adoptRef(new SharedFontFamily);
  62     }
  63
  64 private:
  65     SharedFontFamily() { }
  66 };
  67
  68 PLATFORM_EXPORT bool operator==(const FontFamily&, const FontFamily&);
  69 inline bool operator!=(const FontFamily& a, const FontFamily& b) { return !(a == b); }
  70
  71 inline FontFamily::~FontFamily()
  72 {
  73     RefPtr<SharedFontFamily> reaper = m_next.release();
  74     while (reaper && reaper->hasOneRef())
  75         reaper = reaper->releaseNext(); // implicitly protects reaper->next, then derefs reaper
  76 }
  77
  78 inline const FontFamily* FontFamily::next() const
  79 {
  80     return m_next.get();
  81 }
  82
  83 inline void FontFamily::appendFamily(PassRefPtr<SharedFontFamily> family)
  84 {
  85     m_next = family;
  86 }
  87
  88 inline PassRefPtr<SharedFontFamily> FontFamily::releaseNext()
  89 {
  90     return m_next.release();
  91 }
  92
  93 } // namespace blink
  94
  95 #endif