Method GetGlyphImage

libs/drape/glyph_manager.cpp:160–187

    bool HasGlyph(strings::UniChar unicodePoint) const { return FT_Get_Char_Index(m_fontFace, unicodePoint) != 0; }

    GlyphImage GetGlyphImage(uint16_t glyphId, int pixelHeight, bool sdf) const
    {
      FREETYPE_CHECK(FT_Set_Pixel_Sizes(m_fontFace, 0, pixelHeight));
      // FT_LOAD_RENDER with FT_RENDER_MODE_SDF uses bsdf driver that is around 3x times faster
      // than sdf driver, activated by FT_LOAD_DEFAULT + FT_RENDER_MODE_SDF
      FREETYPE_CHECK(FT_Load_Glyph(m_fontFace, glyphId, FT_LOAD_RENDER));
      if (sdf)
        FREETYPE_CHECK(FT_Render_Glyph(m_fontFace->glyph, FT_RENDER_MODE_SDF));

      FT_Bitmap const & bitmap = m_fontFace->glyph->bitmap;

      SharedBufferManager::shared_buffer_ptr_t data;
      if (bitmap.buffer != nullptr)
      {
        // Bitmap is stored without a padding.
        data = SharedBufferManager::instance().reserveSharedBuffer(bitmap.width * bitmap.rows);
        auto ptr = data->data();

        for (unsigned int row = 0; row < bitmap.rows; ++row)
        {
          unsigned int const dstBaseIndex = row * bitmap.width;
          int const srcBaseIndex = static_cast<int>(row) * bitmap.pitch;
          for (unsigned int column = 0; column < bitmap.width; ++column)
            ptr[dstBaseIndex + column] = bitmap.buffer[srcBaseIndex + column];
        }
      }
      return {bitmap.width, bitmap.rows, data};
    }

    void GetCharcodes(std::vector<FT_ULong> & charcodes) const
    {