Method putPixel

src/doc/algorithm/rotate.cpp:258–264

  }

  void putPixel(const Image* spr, int spr_x, int spr_y) {
    ASSERT(m_it != m_end);

    int c = get_pixel_fast<RgbTraits>(spr, spr_x, spr_y);
    if ((rgba_geta(m_mask_color) == 0) || ((c & rgba_rgb_mask) != (m_mask_color & rgba_rgb_mask)))
      *m_it = rgba_blender_normal(*m_it, c);
  }

private:
  color_t m_mask_color;