Implemented LEF DENSITY statement properly

src/plugins/streamers/lefdef/db_plugin/dbLEFImporter.cc

@@ -937,6 +937,24 @@ LEFImporter::read_macro (Layout &layout)
 
       expect ("END");
 
+    } else if (test ("DENSITY")) {
+
+      //  read over DENSITY statements
+      while (! test ("END")) {
+        if (test ("LAYER")) {
+          get ();
+          expect (";");
+        } else {
+          expect ("RECT");
+          for (int i = 0; i < 5; ++i) {
+            get_double ();
+          }
+          expect (";");
+        }
+      }
+
+      expect ("END");
+
     } else if (test ("FIXEDMASK")) {
 
       mg->set_fixedmask (true);

src/plugins/streamers/lefdef/unit_tests/dbLEFDEFImportTests.cc

@@ -719,6 +719,11 @@ TEST(117_mapfile_all)
   )
 }
 
+TEST(118_density)
+{
+  run_test (_this, "density", "read:in.lef", "au.oas.gz", default_options (), false);
+}
+
 TEST(200_lefdef_plugin)
 {
   db::Layout ly;
@@ -764,3 +769,4 @@ TEST(201_lefdef_plugin_explicit_lef)
 
   db::compare_layouts (_this, ly, fn_path + "au_plugin_alt_lef.oas.gz", db::WriteOAS);
 }
+

testdata/lefdef/density/in.lef

@@ -0,0 +1,27 @@
+LAYER M1
+  TYPE ROUTING ;
+END M1
+LAYER VIA1
+  TYPE CUT ;
+END VIA1
+
+MACRO dense
+  CLASS CORE ;
+  ORIGIN 0.0 0.0 ;
+  SIZE 0.7 BY 0.9 ;
+  OBS
+    LAYER M1 DESIGNRULEWIDTH 0.05 ;
+      RECT 0.04 0.095 0.66 0.685 ;
+    LAYER VIA1 ;
+      RECT 0.285 0.31 0.415 0.36 ;
+      RECT 0.285 0.18 0.415 0.23 ;
+  END
+  DENSITY
+    LAYER M1 ;
+      RECT 0.04 0.09 0.66 0.685 100.0 ;
+    LAYER VIA1 ;
+      RECT 0 0 100 100 45.5 ; #rect from (0,0) to (100,100), density of 45.5%
+      RECT 100 0 200 100 42.2 ; #rect from (100,0) to (200, 100), density of 42.2%
+  END
+END dense
+END LIBRARY