FontPlatformData.h   [plain text]

/*
 * Copyright (C) 2006 Kevin Ollivier  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. 
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
 */
 
#ifndef FontPlatformData_H
#define FontPlatformData_H

#include "FontDescription.h"
#include "CString.h"
#include "AtomicString.h"
#include "StringImpl.h"

#include <wx/defs.h>
#include <wx/font.h>

namespace WebCore {

class FontPlatformData {
public:
    enum FontState { UNINITIALIZED, DELETED, VALID };

    FontPlatformData(WTF::HashTableDeletedValueType)
    : m_fontState(DELETED)
    { }

    ~FontPlatformData();

    FontPlatformData(wxFont f) 
    : m_font(f)
    , m_fontState(VALID)
    {
        m_fontHash = computeHash();        
    }
    
    FontPlatformData(const FontDescription&, const AtomicString&);
    
    FontPlatformData() 
    : m_fontState(UNINITIALIZED)
    {
    }
    
    wxFont font() const {
        return m_font;
    }
    
    unsigned hash() const {
        switch (m_fontState) {
        case DELETED:
            return -1;
        case UNINITIALIZED:
            return 0;
        case VALID:
            return computeHash();              
        }
    }

    bool operator==(const FontPlatformData& other) const
    { 
        if (m_fontState == VALID)
            return other.m_fontState == VALID && m_font.IsOk() && other.m_font.IsOk() && m_font.IsSameAs(other.m_font);
        else
            return m_fontState == other.m_fontState;
    }

    bool isHashTableDeletedValue() const { return m_fontState == DELETED; }
    
    unsigned computeHash() const {
        ASSERT(m_font.IsOk());
        
        // make a hash that is unique for this font, but not globally unique - that is,
        // a font whose properties are equal should generate the same hash
        uintptr_t hashCodes[6] = { m_font.GetPointSize(), m_font.GetFamily(), m_font.GetStyle(), 
                                    m_font.GetWeight(), m_font.GetUnderlined(), 
                                    StringImpl::computeHash(m_font.GetFaceName().mb_str(wxConvUTF8)) };
        
        return StringImpl::computeHash(reinterpret_cast<UChar*>(hashCodes), sizeof(hashCodes) / sizeof(UChar));
    }

private:
    wxFont m_font;
    FontState m_fontState;    
    unsigned m_fontHash;
};

}

#endif