WebCore/platform/graphics/GlyphWidthMap.cpp

/*
 * Copyright (C) 2006 Apple Computer, 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. 
 * 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
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "GlyphWidthMap.h"

namespace WebCore
{

float GlyphWidthMap::widthForGlyph(Glyph g)
{
    unsigned pageNumber = (g / GlyphWidthPage::size);
    GlyphWidthPage* page = locatePage(pageNumber);
    if (page)
        return page->widthForGlyph(g);
    return cGlyphWidthUnknown;
}

void GlyphWidthMap::setWidthForGlyph(Glyph glyph, float width)
{
    unsigned pageNumber = (glyph / GlyphWidthPage::size);
    GlyphWidthPage* page = locatePage(pageNumber);
    if (page)
        page->setWidthForGlyph(glyph, width);
}

inline GlyphWidthMap::GlyphWidthPage* GlyphWidthMap::locatePage(unsigned pageNumber)
{
    GlyphWidthPage* page;
    if (pageNumber == 0) {
        if (m_filledPrimaryPage)
            return &m_primaryPage;
        page = &m_primaryPage;
        m_filledPrimaryPage = true;
    } else {
        if (m_pages) {
            GlyphWidthPage* result = m_pages->get(pageNumber);
            if (result)
                return result;
        }
        page = new GlyphWidthPage;
        if (!m_pages)
            m_pages = new HashMap<int, GlyphWidthPage*>;
        m_pages->set(pageNumber, page);
    }

    // Fill in the whole page with the unknown glyph width value.
    for (unsigned i = 0; i < GlyphWidthPage::size; i++)
        page->setWidthForIndex(i, cGlyphWidthUnknown);

    return page;
}

}