FontDescription.cpp   [plain text]

/*
 * Copyright (C) 2007 Nicholas Shanks <contact@nickshanks.com>
 * Copyright (C) 2008, 2013 Apple 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 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.
 */

#include "config.h"
#include "FontDescription.h"

#include "LocaleToScriptMapping.h"

namespace WebCore {

struct SameSizeAsFontCascadeDescription {
    Vector<void*> vector;
    AtomicString string;
    float size;
    unsigned bitfields1;
    unsigned bitfields2 : 22;
    void* array;
    float size2;
    unsigned bitfields3 : 10;
};

COMPILE_ASSERT(sizeof(FontCascadeDescription) == sizeof(SameSizeAsFontCascadeDescription), FontCascadeDescription_should_stay_small);

FontDescription::FontDescription()
    : m_orientation(Horizontal)
    , m_nonCJKGlyphOrientation(static_cast<unsigned>(NonCJKGlyphOrientation::Mixed))
    , m_widthVariant(RegularWidth)
    , m_italic(FontItalicOff)
    , m_weight(FontWeightNormal)
    , m_renderingMode(static_cast<unsigned>(FontRenderingMode::Normal))
    , m_textRendering(AutoTextRendering)
    , m_script(USCRIPT_COMMON)
    , m_fontSynthesis(FontSynthesisWeight | FontSynthesisStyle)
    , m_variantCommonLigatures(static_cast<unsigned>(FontVariantLigatures::Normal))
    , m_variantDiscretionaryLigatures(static_cast<unsigned>(FontVariantLigatures::Normal))
    , m_variantHistoricalLigatures(static_cast<unsigned>(FontVariantLigatures::Normal))
    , m_variantContextualAlternates(static_cast<unsigned>(FontVariantLigatures::Normal))
    , m_variantPosition(static_cast<unsigned>(FontVariantPosition::Normal))
    , m_variantCaps(static_cast<unsigned>(FontVariantCaps::Normal))
    , m_variantNumericFigure(static_cast<unsigned>(FontVariantNumericFigure::Normal))
    , m_variantNumericSpacing(static_cast<unsigned>(FontVariantNumericSpacing::Normal))
    , m_variantNumericFraction(static_cast<unsigned>(FontVariantNumericFraction::Normal))
    , m_variantNumericOrdinal(static_cast<unsigned>(FontVariantNumericOrdinal::Normal))
    , m_variantNumericSlashedZero(static_cast<unsigned>(FontVariantNumericSlashedZero::Normal))
    , m_variantAlternates(static_cast<unsigned>(FontVariantAlternates::Normal))
    , m_variantEastAsianVariant(static_cast<unsigned>(FontVariantEastAsianVariant::Normal))
    , m_variantEastAsianWidth(static_cast<unsigned>(FontVariantEastAsianWidth::Normal))
    , m_variantEastAsianRuby(static_cast<unsigned>(FontVariantEastAsianRuby::Normal))
{
}

FontTraitsMask FontDescription::traitsMask() const
{
    return static_cast<FontTraitsMask>((m_italic ? FontStyleItalicMask : FontStyleNormalMask)
        | (FontWeight100Mask << (m_weight - FontWeight100)));
    
}

void FontDescription::setLocale(const AtomicString& locale)
{
    m_locale = locale;
    m_script = localeToScriptCodeForFontSelection(m_locale);
}

FontCascadeDescription::FontCascadeDescription()
    : m_isAbsoluteSize(false)
    , m_kerning(static_cast<unsigned>(Kerning::Auto))
    , m_keywordSize(0)
    , m_fontSmoothing(AutoSmoothing)
    , m_isSpecifiedFont(false)
{
}

FontWeight FontCascadeDescription::lighterWeight(void) const
{
    switch (weight()) {
    case FontWeight100:
    case FontWeight200:
    case FontWeight300:
    case FontWeight400:
    case FontWeight500:
        return FontWeight100;

    case FontWeight600:
    case FontWeight700:
        return FontWeight400;

    case FontWeight800:
    case FontWeight900:
        return FontWeight700;
    }
    ASSERT_NOT_REACHED();
    return FontWeightNormal;
}

FontWeight FontCascadeDescription::bolderWeight(void) const
{
    switch (weight()) {
    case FontWeight100:
    case FontWeight200:
    case FontWeight300:
        return FontWeight400;

    case FontWeight400:
    case FontWeight500:
        return FontWeight700;

    case FontWeight600:
    case FontWeight700:
    case FontWeight800:
    case FontWeight900:
        return FontWeight900;
    }
    ASSERT_NOT_REACHED();
    return FontWeightNormal;
}

#if ENABLE(IOS_TEXT_AUTOSIZING)

bool FontCascadeDescription::familiesEqualForTextAutoSizing(const FontCascadeDescription& other) const
{
    unsigned thisFamilyCount = familyCount();
    unsigned otherFamilyCount = other.familyCount();

    if (thisFamilyCount != otherFamilyCount)
        return false;

    for (unsigned i = 0; i < thisFamilyCount; ++i) {
        if (!equalIgnoringASCIICase(familyAt(i), other.familyAt(i)))
            return false;
    }

    return true;
}

#endif // ENABLE(IOS_TEXT_AUTOSIZING)

} // namespace WebCore