Function MakeTextRun

src/rendering/graphics/Text.cpp:51–85

}

static std::unique_ptr<TextRun> MakeTextRun(const std::vector<Glyph*>& glyphs) {
  if (glyphs.empty()) {
    return nullptr;
  }
  auto textRun = new TextRun();
  auto firstGlyph = glyphs[0];
  // Creates text paints.
  textRun->paints[0] = CreateFillPaint(firstGlyph).release();
  textRun->paints[1] = CreateStrokePaint(firstGlyph).release();
  auto textStyle = firstGlyph->getStyle();
  if ((textStyle == TextStyle::StrokeAndFill && !firstGlyph->getStrokeOverFill()) ||
      textRun->paints[0] == nullptr) {
    std::swap(textRun->paints[0], textRun->paints[1]);
  }
  // Creates text blob.
  auto noTranslateMatrix = firstGlyph->getTotalMatrix();
  noTranslateMatrix.setTranslateX(0);
  noTranslateMatrix.setTranslateY(0);
  textRun->matrix = noTranslateMatrix;
  noTranslateMatrix.invert(&noTranslateMatrix);
  std::vector<tgfx::GlyphID> glyphIDs = {};
  std::vector<tgfx::Point> positions = {};
  for (auto& glyph : glyphs) {
    auto m = glyph->getTotalMatrix();
    m.postConcat(noTranslateMatrix);
    for (auto& glyphID : glyph->getGlyphIDs()) {
      glyphIDs.push_back(glyphID);
      positions.push_back({m.getTranslateX(), m.getTranslateY()});
    }
  }
  textRun->textFont = firstGlyph->getFont();
  textRun->glyphIDs = glyphIDs;
  textRun->positions = positions;
  return std::unique_ptr<TextRun>(textRun);
}

std::shared_ptr<Graphic> Text::MakeFrom(const std::vector<GlyphHandle>& glyphs,
                                        std::shared_ptr<TextBlock> textBlock,