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      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 "wtf/RefCounted.h"
     30 #include "wtf/RefPtr.h"
     31 #include "wtf/text/AtomicString.h"
     32 
     33 namespace WebCore {
     34 
     35 class SharedFontFamily;
     36 
     37 class FontFamily {
     38 public:
     39     FontFamily() { }
     40     ~FontFamily();
     41 
     42     void setFamily(const AtomicString& family) { m_family = family; }
     43     const AtomicString& family() const { return m_family; }
     44     bool familyIsEmpty() const { return m_family.isEmpty(); }
     45 
     46     const FontFamily* next() const;
     47 
     48     void appendFamily(PassRefPtr<SharedFontFamily>);
     49     PassRefPtr<SharedFontFamily> releaseNext();
     50 
     51 private:
     52     AtomicString m_family;
     53     RefPtr<SharedFontFamily> m_next;
     54 };
     55 
     56 class SharedFontFamily : public FontFamily, public RefCounted<SharedFontFamily> {
     57 public:
     58     static PassRefPtr<SharedFontFamily> create()
     59     {
     60         return adoptRef(new SharedFontFamily);
     61     }
     62 
     63 private:
     64     SharedFontFamily() { }
     65 };
     66 
     67 bool operator==(const FontFamily&, const FontFamily&);
     68 inline bool operator!=(const FontFamily& a, const FontFamily& b) { return !(a == b); }
     69 
     70 inline FontFamily::~FontFamily()
     71 {
     72     RefPtr<SharedFontFamily> reaper = m_next.release();
     73     while (reaper && reaper->hasOneRef())
     74         reaper = reaper->releaseNext(); // implicitly protects reaper->next, then derefs reaper
     75 }
     76 
     77 inline const FontFamily* FontFamily::next() const
     78 {
     79     return m_next.get();
     80 }
     81 
     82 inline void FontFamily::appendFamily(PassRefPtr<SharedFontFamily> family)
     83 {
     84     m_next = family;
     85 }
     86 
     87 inline PassRefPtr<SharedFontFamily> FontFamily::releaseNext()
     88 {
     89     return m_next.release();
     90 }
     91 
     92 }
     93 
     94 #endif
     95