text: /*
   * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
   */
  
  #pragma once
  
  #include "FontRanges.h"
  #include <wtf/Forward.h>
  #include <wtf/PassRefPtr.h>
  #include <wtf/RefCounted.h>
  
  namespace WebCore {
  
  class FontCascadeDescription;
  class FontDescription;
  class FontSelectorClient;
  
  class FontAccessor : public RefCounted<FontAccessor> {
  public:
      virtual ~FontAccessor() { }
  
      virtual const Font* font() const = 0;
      virtual bool isLoading() const = 0;
  };
  
  class FontSelector : public RefCounted<FontSelector> {
  public:
      virtual ~FontSelector() { }
  
      virtual FontRanges fontRangesForFamily(const FontDescription&, const AtomicString&) = 0;
      virtual RefPtr<Font> fallbackFontAt(const FontDescription&, size_t) = 0;
  
      virtual size_t fallbackFontCount() = 0;
  
      virtual void fontCacheInvalidated() { }
  
      virtual void registerForInvalidationCallbacks(FontSelectorClient&) = 0;
      virtual void unregisterForInvalidationCallbacks(FontSelectorClient&) = 0;
  
      virtual unsigned uniqueId() const = 0;
      virtual unsigned version() const = 0;
  };
  
  }
  