WIP: introducing grids in vias

src/db/db/dbVia.cc

@@ -39,7 +39,9 @@ ViaType::init ()
   htmin = 0.0;
   htmax = -1.0;
   bottom_wired = true;
+  bottom_grid = 0.0;
   top_wired = true;
+  top_grid = 0.0;
 }
 
 // ---------------------------------------------------------------------------------------

src/db/db/dbVia.h

@@ -128,6 +128,13 @@ public:
    */
   bool bottom_wired;
 
+  /**
+   *  @brief The grid of the bottom layer
+   *
+   *  Via dimensions are rounded to this grid on the bottom layer, if non-zero.
+   */
+  double bottom_grid;
+
   /**
    *  @brief The cut layer
    */
@@ -146,6 +153,13 @@ public:
    */
   bool top_wired;
 
+  /**
+   *  @brief The grid of the top layer
+   *
+   *  Via dimensions are rounded to this grid on the top layer, if non-zero.
+   */
+  double top_grid;
+
   /**
    *  @brief The name of the via
    *

src/db/db/gsiDeclDbVia.cc

@@ -136,6 +136,12 @@ Class<db::ViaType> decl_dbViaType ("db", "ViaType",
     "If false, the bottom layer is assume to be a sheet layer, such as diffusion. "
     "In this case, changing the routing layer will not continue drawing a path. "
     "If true (the default), drawing will continue on the bottom layer as a path."
+  ) +
+  make_getter_setter<db::ViaType, double, &db::ViaType::bottom_grid> ("bottom_grid",
+    "@brief If non-zero, the bottom layer's dimensions will be rounded to this grid.\n"
+  ) +
+  make_getter_setter<db::ViaType, double, &db::ViaType::top_grid> ("top_grid",
+    "@brief If non-zero, the top layer's dimensions will be rounded to this grid.\n"
   ),
   "@brief Describes a via type\n"
   "These objects are used by PCellDeclaration#via_types to specify the via types a "

src/edt/edt/edtServiceImpl.cc

@@ -1652,7 +1652,7 @@ PathService::via_initial (int dir)
 }
 
 void
-PathService::compute_via_wh (double &w, double &h, const db::DVector &dwire, double var_ext)
+PathService::compute_via_wh (double &w, double &h, const db::DVector &dwire, double var_ext, double grid)
 {
   w = 0.0, h = 0.0;
 
@@ -1734,10 +1734,14 @@ PathService::compute_via_wh (double &w, double &h, const db::DVector &dwire, dou
 
   }
 
-  //  round down to DBU @@@ (grid)
-  double dbu = layout ().dbu ();
-  w = floor (w / dbu + db::epsilon) * dbu;
-  h = floor (h / dbu + db::epsilon) * dbu;
+  //  round to grid or DBU
+
+  if (grid < db::epsilon) {
+    grid = layout ().dbu ();
+  }
+
+  w = floor (w / grid + db::epsilon) * grid;
+  h = floor (h / grid + db::epsilon) * grid;
 }
 
 void
@@ -1765,7 +1769,7 @@ PathService::via_editing (int dir)
   db::DVector dwire = m_points.back () - m_points [m_points.size () - 2];
 
   double w = 0.0, h = 0.0;
-  compute_via_wh (w, h, dwire, m_endext);
+  compute_via_wh (w, h, dwire, m_endext, is_bottom ? via_def.via_type.bottom_grid : via_def.via_type.top_grid);
 
   double w_bottom = 0.0, h_bottom = 0.0, w_top = 0.0, h_top = 0.0;
   (is_bottom ? w_bottom : w_top) = w;
@@ -1820,7 +1824,7 @@ PathService::update_via ()
   bool is_bottom = ps.via_type.bottom.log_equal (lp);
 
   double w = 0.0, h = 0.0;
-  compute_via_wh (w, h, m_points [1] - m_points [0], m_bgnext);
+  compute_via_wh (w, h, m_points [1] - m_points [0], m_bgnext, is_bottom ? ps.via_type.bottom_grid : ps.via_type.top_grid);
 
   std::map<std::string, tl::Variant> params;
 

src/edt/edt/edtServiceImpl.h

@@ -275,7 +275,7 @@ private:
   db::Path get_path () const;
   void set_last_point (const db::DPoint &p);
   void update_via ();
-  void compute_via_wh (double &w, double &h, const db::DVector &dwire, double var_ext);
+  void compute_via_wh (double &w, double &h, const db::DVector &dwire, double var_ext, double grid);
   db::Instance make_via (const db::SelectedViaDefinition &via_def, double w_bottom, double h_bottom, double w_top, double h_top, const db::DPoint &via_pos);
   void via_initial (int dir);
   void via_editing (int dir);