flutter_flutter/sky/engine/platform/fonts/FontPlatformData.cpp

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 *
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * 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.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "sky/engine/platform/fonts/FontPlatformData.h"

#include "sky/engine/platform/fonts/harfbuzz/HarfBuzzFace.h"
#include "sky/engine/wtf/text/WTFString.h"
#include "third_party/skia/include/core/SkTypeface.h"

namespace blink {

FontPlatformData::FontPlatformData(WTF::HashTableDeletedValueType)
    : m_textSize(0)
    , m_syntheticBold(false)
    , m_syntheticItalic(false)
    , m_orientation(Horizontal)
    , m_isHashTableDeletedValue(true)
{
}

FontPlatformData::FontPlatformData()
    : m_textSize(0)
    , m_syntheticBold(false)
    , m_syntheticItalic(false)
    , m_orientation(Horizontal)
    , m_isHashTableDeletedValue(false)
{
}

FontPlatformData::FontPlatformData(float textSize, bool syntheticBold, bool syntheticItalic)
    : m_textSize(textSize)
    , m_syntheticBold(syntheticBold)
    , m_syntheticItalic(syntheticItalic)
    , m_orientation(Horizontal)
    , m_isHashTableDeletedValue(false)
{
}

FontPlatformData::FontPlatformData(const FontPlatformData& src)
    : m_typeface(src.m_typeface)
    , m_family(src.m_family)
    , m_textSize(src.m_textSize)
    , m_syntheticBold(src.m_syntheticBold)
    , m_syntheticItalic(src.m_syntheticItalic)
    , m_orientation(src.m_orientation)
    , m_style(src.m_style)
    , m_harfBuzzFace(nullptr)
    , m_isHashTableDeletedValue(false)
{
}

FontPlatformData::FontPlatformData(sk_sp<SkTypeface> tf, const char* family, float textSize, bool syntheticBold, bool syntheticItalic, FontOrientation orientation, bool subpixelTextPosition)
    : m_typeface(tf)
    , m_family(family)
    , m_textSize(textSize)
    , m_syntheticBold(syntheticBold)
    , m_syntheticItalic(syntheticItalic)
    , m_orientation(orientation)
    , m_isHashTableDeletedValue(false)
{
    querySystemForRenderStyle(subpixelTextPosition);
}

FontPlatformData::FontPlatformData(const FontPlatformData& src, float textSize)
    : m_typeface(src.m_typeface)
    , m_family(src.m_family)
    , m_textSize(textSize)
    , m_syntheticBold(src.m_syntheticBold)
    , m_syntheticItalic(src.m_syntheticItalic)
    , m_orientation(src.m_orientation)
    , m_harfBuzzFace(nullptr)
    , m_isHashTableDeletedValue(false)
{
    querySystemForRenderStyle(FontDescription::subpixelPositioning());
}

FontPlatformData::~FontPlatformData()
{
}

FontPlatformData& FontPlatformData::operator=(const FontPlatformData& src)
{
    m_typeface = src.m_typeface;
    m_family = src.m_family;
    m_textSize = src.m_textSize;
    m_syntheticBold = src.m_syntheticBold;
    m_syntheticItalic = src.m_syntheticItalic;
    m_harfBuzzFace = nullptr;
    m_orientation = src.m_orientation;
    m_style = src.m_style;
    return *this;
}

#ifndef NDEBUG
String FontPlatformData::description() const
{
    return String();
}
#endif

SkFontID FontPlatformData::uniqueID() const
{
    return m_typeface->uniqueID();
}

String FontPlatformData::fontFamilyName() const
{
    // FIXME(crbug.com/326582): come up with a proper way of handling SVG.
    if (!this->typeface())
        return "";
    SkTypeface::LocalizedStrings* fontFamilyIterator = this->typeface()->createFamilyNameIterator();
    SkTypeface::LocalizedString localizedString;
    while (fontFamilyIterator->next(&localizedString) && !localizedString.fString.size()) { }
    fontFamilyIterator->unref();
    return String(localizedString.fString.c_str());
}

bool FontPlatformData::operator==(const FontPlatformData& a) const
{
    // If either of the typeface pointers are null then we test for pointer
    // equality. Otherwise, we call SkTypeface::Equal on the valid pointers.
    bool typefacesEqual;
    if (!m_typeface || !a.m_typeface)
        typefacesEqual = m_typeface == a.m_typeface;
    else
        typefacesEqual = SkTypeface::Equal(m_typeface.get(), a.m_typeface.get());

    return typefacesEqual
        && m_textSize == a.m_textSize
        && m_syntheticBold == a.m_syntheticBold
        && m_syntheticItalic == a.m_syntheticItalic
        && m_orientation == a.m_orientation
        && m_style == a.m_style
        && m_isHashTableDeletedValue == a.m_isHashTableDeletedValue;
}

bool FontPlatformData::isFixedPitch() const
{
    return typeface() && typeface()->isFixedPitch();
}

HarfBuzzFace* FontPlatformData::harfBuzzFace() const
{
    if (!m_harfBuzzFace)
        m_harfBuzzFace = HarfBuzzFace::create(const_cast<FontPlatformData*>(this), uniqueID());

    return m_harfBuzzFace.get();
}

} // namespace blink