fontplatformdatachromiumwin.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2006, 2007 Apple Computer, Inc.
 * Copyright (c) 2006, 2007, 2008, 2009, Google Inc. All rights reserved.
 * 
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 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#ifndef FontPlatformDataWin_h
#define FontPlatformDataWin_h

#include "config.h"

#include "StringImpl.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>

#include <usp10.h>

typedef struct HFONT__ *HFONT;

namespace WebCore {

class FontDescription;

class FontPlatformData {
public:
    // Used for deleted values in the font cache's hash tables. The hash table
    // will create us with this structure, and it will compare other values
    // to this "Deleted" one. It expects the Deleted one to be differentiable
    // from the NULL one (created with the empty constructor), so we can't just
    // set everything to NULL.
    FontPlatformData(WTF::HashTableDeletedValueType);
    FontPlatformData();
    FontPlatformData(HFONT, float size);
    FontPlatformData(float size, bool bold, bool oblique);
    FontPlatformData(const FontPlatformData&);

    FontPlatformData& operator=(const FontPlatformData&);

    bool isHashTableDeletedValue() const { return m_font == hashTableDeletedFontValue(); }

    ~FontPlatformData();

    HFONT hfont() const { return m_font ? m_font->hfont() : 0; }
    float size() const { return m_size; }

    unsigned hash() const
    { 
        return m_font ? m_font->hash() : NULL;
    }

    bool operator==(const FontPlatformData& other) const
    { 
        return m_font == other.m_font && m_size == other.m_size;
    }

    SCRIPT_FONTPROPERTIES* scriptFontProperties() const;
    SCRIPT_CACHE* scriptCache() const { return &m_scriptCache; }

private:
    // We refcount the internal HFONT so that FontPlatformData can be
    // efficiently copied. WebKit depends on being able to copy it, and we
    // don't really want to re-create the HFONT.
    class RefCountedHFONT : public RefCounted<RefCountedHFONT> {
    public:
        static PassRefPtr<RefCountedHFONT> create(HFONT hfont)
        {
            return adoptRef(new RefCountedHFONT(hfont));
        }

        ~RefCountedHFONT();

        HFONT hfont() const { return m_hfont; }
        unsigned hash() const
        {
            return StringImpl::computeHash(reinterpret_cast<const UChar*>(&m_hfont), sizeof(HFONT) / sizeof(UChar));
        }

        bool operator==(const RefCountedHFONT& other) const
        {
            return m_hfont == other.m_hfont;
        }

    private:
        // The create() function assumes there is already a refcount of one 
        // so it can do adoptRef.
        RefCountedHFONT(HFONT hfont) : m_hfont(hfont)
        {
        }

        HFONT m_hfont;
    };

    static RefCountedHFONT* hashTableDeletedFontValue();

    RefPtr<RefCountedHFONT> m_font;
    float m_size;  // Point size of the font in pixels.

    mutable SCRIPT_CACHE m_scriptCache;
    mutable SCRIPT_FONTPROPERTIES* m_scriptFontProperties;
};

} // WebCore

#endif // FontPlatformDataWin_h