Method StraightTextLayout

libs/drape_frontend/text_layout.cpp:287–325

}

StraightTextLayout::StraightTextLayout(std::string const & text, float fontSize, ref_ptr<dp::TextureManager> textures,
                                       dp::Anchor anchor, bool forceNoWrap,
                                       localisation::LanguageIndex const textLanguageIndex)
{
  /*
   * TODO Temporary workaround: If the string contains newlines, replace them with whitespaces.
   * On the long run, this should be fixed in the map generator and this workaround removed after
   * a few months, when maps with buggy data can be expected to have been phased out.
   */
  std::string stext = text;
  while (stext.find('\n') != std::string::npos)
    stext[stext.find('\n')] = ' ';
  ASSERT_EQUAL(std::string::npos, stext.find('\n'), ("Multiline text is not expected", stext));

  m_textSizeRatio = fontSize * static_cast<float>(VisualParams::Instance().GetFontScale()) / dp::kBaseFontSizePixels;
  m_shapedGlyphs = textures->ShapeSingleTextLine(dp::kBaseFontSizePixels, stext, &m_glyphRegions, textLanguageIndex);

  // TODO(AB): Use ICU's BreakIterator to split text properly in different languages without spaces.
  // TODO(AB): Implement SplitText for RTL languages.
  auto const lines =
      SplitText(forceNoWrap || m_shapedGlyphs.m_isRTL, m_textSizeRatio, textures->GetSpaceGlyph(), m_shapedGlyphs);
  m_rowsCount = lines.size();

  float summaryHeight = 0.;
  float maxLength = 0;
  for (auto const & line : lines)
  {
    summaryHeight += line.m_scaledHeight;
    maxLength = std::max(maxLength, line.m_scaledLength);
  }

  XLayouter const xL(anchor);
  YLayouter yL(anchor, summaryHeight);

  for (auto const & l : lines)
    m_offsets.emplace_back(l.m_nextLineStartIndex, glsl::vec2(xL(l.m_scaledLength, maxLength), yL(l.m_scaledHeight)));

  m_pixelSize = m2::PointF(maxLength, summaryHeight);
}

m2::PointF StraightTextLayout::GetSymbolBasedTextOffset(m2::PointF const & symbolSize, dp::Anchor textAnchor,
                                                        dp::Anchor symbolAnchor)