Method Precache

libs/drape_frontend/gui/gui_text.cpp:315–356

}

void MutableLabel::Precache(PrecacheParams const & params, PrecacheResult & result, ref_ptr<dp::TextureManager> mng)
{
  SetMaxLength(static_cast<uint16_t>(params.m_maxLength));

  m_textRatio = params.m_font.m_size * static_cast<float>(df::VisualParams::Instance().GetVisualScale()) /
                dp::kBaseFontSizePixels;

  // TODO(AB): Is this shaping/precaching really needed if the text changes every frame?
  m_shapedText = mng->ShapeSingleTextLine(dp::kBaseFontSizePixels, params.m_alphabet, &m_glyphRegions);

  auto const firstTexture = m_glyphRegions.front().GetTexture();
#ifdef DEBUG
  for (auto const & region : m_glyphRegions)
    ASSERT_EQUAL(firstTexture, region.GetTexture(), ());
#endif
  result.m_state.SetMaskTexture(firstTexture);

  dp::TextureManager::ColorRegion color;
  dp::TextureManager::ColorRegion outlineColor;

  mng->GetColorRegion(params.m_font.m_color, color);
  mng->GetColorRegion(params.m_font.m_outlineColor, outlineColor);
  result.m_state.SetColorTexture(color.GetTexture());

  glsl::vec2 colorTex = glsl::ToVec2(color.GetTexRect().Center());
  glsl::vec2 outlineTex = glsl::ToVec2(outlineColor.GetTexRect().Center());

  auto const vertexCount = m_maxLength * dp::Batcher::VertexPerQuad;
  result.m_buffer.resize(vertexCount, StaticVertex(glsl::vec3(0.0, 0.0, 0.0), colorTex, outlineTex));

  float depth = 0.0f;
  for (size_t i = 0; i < vertexCount; i += 4)
  {
    result.m_buffer[i + 0].m_position.z = depth;
    result.m_buffer[i + 1].m_position.z = depth;
    result.m_buffer[i + 2].m_position.z = depth;
    result.m_buffer[i + 3].m_position.z = depth;
    depth += 10.0f;
  }

  result.m_maxPixelSize = m2::PointF(m_shapedText.m_lineWidthInPixels, m_shapedText.m_maxLineHeightInPixels);
}

void MutableLabel::SetText(LabelResult & result, std::string text, ref_ptr<dp::TextureManager> mng)
{