FontCacheSkia.cpp   [plain text]

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

#include "Font.h"
#include "FontDescription.h"
#include "FontPlatformData.h"
#include "Logging.h"
#include "NotImplemented.h"
#include "PlatformSupport.h"
#include "SimpleFontData.h"

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

#include <unicode/locid.h>
#include <wtf/Assertions.h>
#include <wtf/text/AtomicString.h>
#include <wtf/text/CString.h>

namespace WebCore {

void FontCache::platformInit()
{
}

const SimpleFontData* FontCache::getFontDataForCharacters(const Font& font,
                                                          const UChar* characters,
                                                          int length)
{
    icu::Locale locale = icu::Locale::getDefault();
    PlatformSupport::FontFamily family;
    PlatformSupport::getFontFamilyForCharacters(characters, length, locale.getLanguage(), &family);
    if (family.name.isEmpty())
        return 0;

    AtomicString atomicFamily(family.name);
    // Changes weight and/or italic of given FontDescription depends on
    // the result of fontconfig so that keeping the correct font mapping
    // of the given characters. See http://crbug.com/32109 for details.
    bool shouldSetFakeBold = false;
    bool shouldSetFakeItalic = false;
    FontDescription description(font.fontDescription());
    if (family.isBold && description.weight() < FontWeightBold)
        description.setWeight(FontWeightBold);
    if (!family.isBold && description.weight() >= FontWeightBold) {
        shouldSetFakeBold = true;
        description.setWeight(FontWeightNormal);
    }
    if (family.isItalic && description.italic() == FontItalicOff)
        description.setItalic(FontItalicOn);
    if (!family.isItalic && description.italic() == FontItalicOn) {
        shouldSetFakeItalic = true;
        description.setItalic(FontItalicOff);
    }

    FontPlatformData platformData = FontPlatformData(*getCachedFontPlatformData(description, atomicFamily, DoNotRetain));
    platformData.setFakeBold(shouldSetFakeBold);
    platformData.setFakeItalic(shouldSetFakeItalic);
    return getCachedFontData(&platformData, DoNotRetain);
}

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

SimpleFontData* FontCache::getLastResortFallbackFont(const FontDescription& description, ShouldRetain shouldRetain)
{
    DEFINE_STATIC_LOCAL(const AtomicString, sansStr, ("Sans"));
    DEFINE_STATIC_LOCAL(const AtomicString, serifStr, ("Serif"));
    DEFINE_STATIC_LOCAL(const AtomicString, monospaceStr, ("Monospace"));

    FontPlatformData* fontPlatformData = 0;
    switch (description.genericFamily()) {
    case FontDescription::SerifFamily:
        fontPlatformData = getCachedFontPlatformData(description, serifStr);
        break;
    case FontDescription::MonospaceFamily:
        fontPlatformData = getCachedFontPlatformData(description, monospaceStr);
        break;
    case FontDescription::SansSerifFamily:
    default:
        fontPlatformData = getCachedFontPlatformData(description, sansStr);
        break;
    }

    ASSERT(fontPlatformData);
    return getCachedFontData(fontPlatformData, shouldRetain);
}

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 we're creating a fallback font (e.g. "-webkit-monospace"), convert the name into
    // the fallback name (like "monospace") that fontconfig understands.
    if (!family.length() || family.startsWith("-webkit-")) {
        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 (!name)
            name = "";
    } 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::CreateFromName(name, static_cast<SkTypeface::Style>(style));
    if (!tf)
        return 0;

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

} // namespace WebCore