fontcachegtk.cpp

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) 2008 Alp Toker <[e-mail]>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "FontCache.h"

#include "Font.h"
#include "SimpleFontData.h"
#include <wtf/Assertions.h>

namespace WebCore {

void FontCache::platformInit()
{
    if (!FontPlatformData::init())
        ASSERT_NOT_REACHED();
}

const SimpleFontData* FontCache::getFontDataForCharacters(const Font& font, const UChar* characters, int length)
{
#if defined(USE_FREETYPE)
    FcResult fresult;
    FontPlatformData* prim = const_cast<FontPlatformData*>(&font.primaryFont()->m_font);

    if (!prim->m_fallbacks)
        prim->m_fallbacks = FcFontSort(NULL, prim->m_pattern, FcTrue, NULL, &fresult);

    FcFontSet* fs = prim->m_fallbacks;

    for (int i = 0; i < fs->nfont; i++) {
        FcPattern* fin = FcFontRenderPrepare(NULL, prim->m_pattern, fs->fonts[i]);
        cairo_font_face_t* fontFace = cairo_ft_font_face_create_for_pattern(fin);
        FontPlatformData alternateFont(fontFace, font.fontDescription().computedPixelSize(), false, false);
        cairo_font_face_destroy(fontFace);
        alternateFont.m_pattern = fin;
        SimpleFontData* sfd = getCachedFontData(&alternateFont);
        if (sfd->containsCharacters(characters, length))
            return sfd;
    }
#endif

    return 0;
}

FontPlatformData* FontCache::getSimilarFontPlatformData(const Font& font)
{
    return 0;
}

FontPlatformData* FontCache::getLastResortFallbackFont(const FontDescription& fontDescription)
{
    // FIXME: Would be even better to somehow get the user's default font here.
    // For now we'll pick the default that the user would get without changing any prefs.
    static AtomicString timesStr("Times New Roman");
    return getCachedFontPlatformData(fontDescription, timesStr);
}

void FontCache::getTraitsInFamily(const AtomicString& familyName, Vector<unsigned>& traitsMasks)
{
}

FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& family)
{
    return new FontPlatformData(fontDescription, family);
}

}