Function create_precursor_bitmaps

src/laybasic/laybasic/layBitmapsToImage.cc:433–466

}

static void create_precursor_bitmaps (const std::vector<lay::ViewOp> &view_ops_in, const std::vector <unsigned int> &vo_map, const std::vector<lay::Bitmap *> &pbitmaps_in, const std::vector<unsigned int> &bm_map, const lay::LineStyles &ls, unsigned int width, unsigned int height, std::map<unsigned int, lay::Bitmap> &precursors, tl::Mutex *mutex)
{
  tl_assert (bm_map.size () == vo_map.size ());

  //  Styled lines with width > 1 are not rendered directly, but through an intermediate step.
  //  We prepare the necessary precursor bitmaps now
  for (unsigned int i = 0; i < vo_map.size (); ++i) {

    unsigned int vo_index = vo_map [i];
    unsigned int bm_index = bm_map [i];

    const ViewOp &op = view_ops_in [vo_index];
    if (op.width () > 1 && ls.style (op.line_style_index ()).width () > 0) {

      //  lock bitmaps against change by the redraw thread
      if (mutex) {
        mutex->lock ();
      }

      lay::Bitmap &bp = precursors.insert (std::make_pair (bm_index, lay::Bitmap (width, height, 1.0, 1.0))).first->second;
      const LineStyleInfo &ls_info = ls.style (op.line_style_index ()).scaled (op.width ());

      for (unsigned int y = 0; y < height; y++) {
        render_scanline_std_edge (ls_info.pattern (), ls_info.pattern_stride (), pbitmaps_in [bm_index], y, width, height, bp.scanline (y));
      }

      if (mutex) {
        mutex->unlock ();
      }

    }

  }
}

void
bitmaps_to_image (const std::vector<lay::ViewOp> &view_ops_in,