fontcachelinux.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

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 * 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
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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
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER 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,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

#include <fontconfig/fontconfig.h>

#include "AtomicString.h"
#include "CString.h"
#include "Font.h"
#include "FontDescription.h"
#include "FontPlatformData.h"
#include "Logging.h"
#include "NotImplemented.h"
#include "SimpleFontData.h"

#include "SkPaint.h"
#include "SkTypeface.h"
#include "SkUtils.h"

namespace WebCore {

void FontCache::platformInit()
{
}

const SimpleFontData* FontCache::getFontDataForCharacters(const Font& font,
                                                          const UChar* characters,
                                                          int length)
{
    FcCharSet* cset = FcCharSetCreate();
    for (int i = 0; i < length; ++i)
        FcCharSetAddChar(cset, characters[i]);

    FcPattern* pattern = FcPatternCreate();

    FcValue fcvalue;
    fcvalue.type = FcTypeCharSet;
    fcvalue.u.c = cset;
    FcPatternAdd(pattern, FC_CHARSET, fcvalue, 0);

    FcConfigSubstitute(0, pattern, FcMatchPattern);
    FcDefaultSubstitute(pattern);

    FcResult result;
    FcPattern* match = FcFontMatch(0, pattern, &result);
    FcPatternDestroy(pattern);

    SimpleFontData* ret = 0;

    if (match) {
        FcChar8* family;
        if (FcPatternGetString(match, FC_FAMILY, 0, &family) == FcResultMatch) {
            FontPlatformData* fpd =
                createFontPlatformData(font.fontDescription(), AtomicString((char*) family));
            ret = new SimpleFontData(*fpd);
        }
        FcPatternDestroy(match);
    }

    FcCharSetDestroy(cset);

    return ret;
}

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

FontPlatformData* FontCache::getLastResortFallbackFont(const FontDescription& description)
{
    static AtomicString arialStr("Arial");
    return getCachedFontPlatformData(description, arialStr);
}

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

FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription,
                                                    const AtomicString& family)
{
    const char* name = 0;
    CString s;

    if (family.length() == 0) {
        static const struct {
            FontDescription::GenericFamilyType mType;
            const char* mName;
        } fontDescriptions[] = {
            { FontDescription::SerifFamily, "serif" },
            { FontDescription::SansSerifFamily, "sans-serif" },
            { FontDescription::MonospaceFamily, "monospace" },
            { FontDescription::CursiveFamily, "cursive" },
            { FontDescription::FantasyFamily, "fantasy" }
        };

        FontDescription::GenericFamilyType type = fontDescription.genericFamily();
        for (unsigned i = 0; i < SK_ARRAY_COUNT(fontDescriptions); i++) {
            if (type == fontDescriptions[i].mType) {
                name = fontDescriptions[i].mName;
                break;
            }
        }
        // if we fall out of the loop, it's ok for name to still be 0
    }
    else {    // convert the name to utf8
        s = family.string().utf8();
        name = s.data();
    }

    int style = SkTypeface::kNormal;
    if (fontDescription.weight() >= FontWeightBold)
        style |= SkTypeface::kBold;
    if (fontDescription.italic())
        style |= SkTypeface::kItalic;

    SkTypeface* tf = SkTypeface::Create(name, static_cast<SkTypeface::Style>(style));
    if (!tf)
        return 0;

    FontPlatformData* result =
        new FontPlatformData(tf,
                             fontDescription.computedSize(),
                             (style & SkTypeface::kBold) && !tf->isBold(),
                             (style & SkTypeface::kItalic) && !tf->isItalic());
    tf->unref();
    return result;
}

AtomicString FontCache::getGenericFontForScript(UScriptCode script,
                                                const FontDescription& descript)
{
    notImplemented();
    return AtomicString();
}

}  // namespace WebCore