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

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#include "flutter/sky/engine/platform/fonts/FontPlatformData.h"

#include "flutter/sky/engine/platform/fonts/harfbuzz/HarfBuzzFace.h"
#include "flutter/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