diff --git a/src/ext/ext/extGerberImporter.cc b/src/ext/ext/extGerberImporter.cc
index 7443c6f07..b66c5b319 100644
--- a/src/ext/ext/extGerberImporter.cc
+++ b/src/ext/ext/extGerberImporter.cc
@@ -108,7 +108,12 @@ static std::string format_to_string (int l, int t, bool tz)
 
 GerberFileReader::GerberFileReader ()
   : m_circle_points (64), m_digits_before (-1), m_digits_after (-1), m_omit_leading_zeroes (true),
-    m_merge (false), m_inverse (false), m_dbu (0.001), m_unit (1000.0), m_ep (true /*report progress*/), 
+    m_merge (false), m_inverse (false),
+    m_dbu (0.001), m_unit (1000.0),
+    m_rot (0.0), m_s (1.0), m_ox (0.0), m_oy (0.0),
+    m_mx (false), m_my (false),
+    m_orot (0.0), m_os (1.0), m_omx (false), m_omy (false),
+    m_ep (true /*report progress*/),
     mp_layout (0), mp_top_cell (0), mp_stream (0),
     m_progress (tl::to_string (QObject::tr ("Reading Gerber file")), 10000)
 {
@@ -128,19 +133,14 @@ GerberFileReader::accepts (tl::TextInputStream &stream)
 void 
 GerberFileReader::read (tl::TextInputStream &stream, db::Layout &layout, db::Cell &cell, const std::vector <unsigned int> &targets)
 {
-  reset_step_and_repeat ();
+  GraphicsState state;
+  swap_graphics_state (state);
 
-  m_inverse = false;
   mp_stream = &stream;
   mp_layout = &layout;
   mp_top_cell = &cell;
   m_target_layers = targets;
 
-  m_polygons.clear ();
-  m_lines.clear ();
-  m_clear_polygons.clear ();
-  m_local_trans = db::DCplxTrans ();
-
   try {
     do_read ();
   } catch (tl::Exception &ex) {
@@ -236,10 +236,89 @@ GerberFileReader::read_coord (tl::Extractor &ex)
   return number * m_unit * sign;
 }
 
-void 
+void
+GerberFileReader::swap_graphics_state (GraphicsState &state)
+{
+  std::swap (m_merge, state.merge);
+  std::swap (m_inverse, state.inverse);
+  std::swap (m_global_trans, state.global_trans);
+  std::swap (m_s, state.m_s);
+  std::swap (m_mx, state.m_mx);
+  std::swap (m_my, state.m_my);
+  std::swap (m_ox, state.m_ox);
+  std::swap (m_oy, state.m_oy);
+  std::swap (m_rot, state.m_rot);
+  std::swap (m_os, state.m_os);
+  std::swap (m_omx, state.m_omx);
+  std::swap (m_omy, state.m_omy);
+  std::swap (m_orot, state.m_orot);
+  std::swap (m_lines, state.lines);
+  std::swap (m_polygons, state.polygons);
+  std::swap (m_clear_polygons, state.clear_polygons);
+  std::swap (m_displacements, state.displacements);
+}
+
+void
+GerberFileReader::push_state (const std::string &token)
+{
+  m_graphics_stack.push_back (GraphicsState ());
+  swap_graphics_state (m_graphics_stack.back ());
+  m_graphics_stack.back ().token = token;
+}
+
+std::string
+GerberFileReader::pop_state ()
+{
+  std::string token;
+
+  if (! m_graphics_stack.empty ()) {
+    swap_graphics_state (m_graphics_stack.back ());
+    token = m_graphics_stack.back ().token;
+  }
+
+  m_graphics_stack.pop_back ();
+  return token;
+}
+
+bool
+GerberFileReader::graphics_stack_empty () const
+{
+  return m_graphics_stack.empty ();
+}
+
+db::DCplxTrans
+GerberFileReader::local_trans () const
+{
+  // TODO: is this order correct?
+  db::DCplxTrans lt = db::DCplxTrans (m_s, m_rot, false, db::DVector (m_ox, m_oy));
+  if (m_mx) {
+    lt *= db::DCplxTrans (db::DTrans (db::FTrans::m0));
+  }
+  if (m_my) {
+    lt *= db::DCplxTrans (db::DTrans (db::FTrans::m90));
+  }
+
+  return lt;
+}
+
+db::DCplxTrans
+GerberFileReader::object_trans () const
+{
+  db::DCplxTrans ot = db::DCplxTrans (m_os, m_orot, false, db::DVector ());
+  if (m_omx) {
+    ot *= db::DCplxTrans (db::DTrans (db::FTrans::m0));
+  }
+  if (m_omy) {
+    ot *= db::DCplxTrans (db::DTrans (db::FTrans::m90));
+  }
+
+  return ot;
+}
+
+void
 GerberFileReader::produce_line (const db::DPath &p, bool clear)
 {
-  db::DCplxTrans t = m_global_trans * db::DCplxTrans (1.0 / dbu ()) * m_local_trans; 
+  db::DCplxTrans t = global_trans () * db::DCplxTrans (1.0 / dbu ()) * local_trans ();
 
   //  Ignore clear paths for now - they cannot be subtracted from anything.
   //  Clear is just provided for completeness.
@@ -258,7 +337,7 @@ GerberFileReader::produce_line (const db::DPath &p, bool clear)
 void 
 GerberFileReader::produce_polygon (const db::DPolygon &p, bool clear)
 {
-  db::DCplxTrans t = m_global_trans * db::DCplxTrans (1.0 / dbu ()) * m_local_trans; 
+  db::DCplxTrans t = global_trans () * db::DCplxTrans (1.0 / dbu ()) * local_trans ();
 
   if (! clear) {
     process_clear_polygons ();
@@ -288,7 +367,29 @@ GerberFileReader::process_clear_polygons ()
   }
 }
 
-void 
+void
+GerberFileReader::collect (db::Region &region)
+{
+  process_clear_polygons ();
+
+  if (m_merge) {
+    std::vector<db::Polygon> merged_polygons;
+    m_ep.merge (m_polygons, merged_polygons, 0, false /*don't resolve holes*/);
+    m_polygons.swap (merged_polygons);
+  }
+
+  for (std::vector<db::Polygon>::const_iterator p = m_polygons.begin (); p != m_polygons.end (); ++p) {
+    region.insert (*p);
+  }
+  for (std::vector<db::Path>::const_iterator p = m_lines.begin (); p != m_lines.end (); ++p) {
+    region.insert (*p);
+  }
+
+  m_polygons.clear ();
+  m_lines.clear ();
+}
+
+void
 GerberFileReader::flush ()
 {
   process_clear_polygons ();
diff --git a/src/ext/ext/extGerberImporter.h b/src/ext/ext/extGerberImporter.h
index c72e58295..f5f795105 100644
--- a/src/ext/ext/extGerberImporter.h
+++ b/src/ext/ext/extGerberImporter.h
@@ -30,6 +30,7 @@
 #include "dbLayout.h"
 #include "dbTrans.h"
 #include "dbEdgeProcessor.h"
+#include "dbRegion.h"
 #include "tlStream.h"
 #include "tlProgress.h"
 
@@ -48,6 +49,36 @@ namespace lay
 namespace ext
 {
 
+/**
+ *  @brief A class holding the graphics state of the reader
+ */
+struct GraphicsState
+{
+  GraphicsState ()
+    : merge (false), inverse (false),
+      m_rot (0.0), m_s (1.0), m_ox (false), m_oy (false), m_mx (false), m_my (false),
+      m_orot (0.0), m_os (1.0), m_omx (false), m_omy (false)
+  {
+    displacements.push_back (db::DVector ());
+  }
+
+  bool merge;
+  bool inverse;
+  db::DCplxTrans global_trans;
+  double m_rot;
+  double m_s;
+  double m_ox, m_oy;
+  bool m_mx, m_my;
+  double m_orot;
+  double m_os;
+  bool m_omx, m_omy;
+  std::vector<db::Path> lines;
+  std::vector<db::Polygon> polygons;
+  std::vector<db::Polygon> clear_polygons;
+  std::vector<db::DVector> displacements;
+  std::string token;
+};
+
 /**
  *  @brief The base class for all readers
  */
@@ -283,14 +314,14 @@ protected:
   void fatal (const std::string &error);
 
   /**
-   *  @brief Set the local transformation
-   *
-   *  The global transformation is applied before the global transformation
+   *  @brief Gets the local transformation
    */
-  void set_local_trans (const db::DCplxTrans &trans)
-  {
-    m_local_trans = trans;
-  }
+  db::DCplxTrans local_trans () const;
+
+  /**
+   *  @brief Gets the local transformation
+   */
+  db::DCplxTrans object_trans () const;
 
   /**
    *  @brief Read a coordinate from the extractor using the format and unit
@@ -306,9 +337,32 @@ protected:
 
   /**
    *  @brief Flush the stored data to the output
+   *  This method is similar to collect(), but writes the data to the layout.
    */
   void flush ();
 
+  /**
+   *  @brief Collects the data taken so far into the given region
+   *  This method is similar to flush(), but will return a Region object.
+   */
+  void collect (db::Region &region);
+
+  /**
+   *  @brief Pushes the graphics state
+   */
+  void push_state (const std::string &token);
+
+  /**
+   *  @brief Pops the graphics state
+   *  Returns the token given in "push_state"
+   */
+  std::string pop_state ();
+
+  /**
+   *  @brief Returns true if the graphics stack is empty
+   */
+  bool graphics_stack_empty () const;
+
   /**
    *  @brief Access to the edge processor
    */
@@ -353,6 +407,62 @@ protected:
     return *mp_stream;
   }
 
+  /**
+   *  @brief Updates the local mirror flags
+   */
+  void update_local_mirror (bool mx, bool my)
+  {
+    m_mx = mx; m_my = my;
+  }
+
+  /**
+   *  @brief Updates the local orientation
+   */
+  void update_local_angle (double rot)
+  {
+    m_rot = rot;
+  }
+
+  /**
+   *  @brief Updates the local scale factor
+   */
+  void update_local_scale (double s)
+  {
+    m_s = s;
+  }
+
+  /**
+   *  @brief Updates the local offset
+   */
+  void update_local_offset (double x, double y)
+  {
+    m_ox = x; m_oy = y;
+  }
+
+  /**
+   *  @brief Updates the object mirror flags
+   */
+  void update_object_mirror (bool mx, bool my)
+  {
+    m_omx = mx; m_omy = my;
+  }
+
+  /**
+   *  @brief Updates the object orientation
+   */
+  void update_object_angle (double rot)
+  {
+    m_orot = rot;
+  }
+
+  /**
+   *  @brief Updates the object scale factor
+   */
+  void update_object_scale (double s)
+  {
+    m_os = s;
+  }
+
 private:
   int m_circle_points;
   int m_digits_before;
@@ -362,8 +472,14 @@ private:
   bool m_inverse;
   double m_dbu;
   double m_unit;
-  db::DCplxTrans m_global_trans, m_local_trans;
-  std::vector<db::DPoint> m_polygon_points;
+  db::DCplxTrans m_global_trans;
+  double m_rot;
+  double m_s;
+  double m_ox, m_oy;
+  bool m_mx, m_my;
+  double m_orot;
+  double m_os;
+  bool m_omx, m_omy;
   std::vector<db::Path> m_lines;
   std::vector<db::Polygon> m_polygons;
   std::vector<db::Polygon> m_clear_polygons;
@@ -374,8 +490,10 @@ private:
   db::Cell *mp_top_cell;
   tl::TextInputStream *mp_stream;
   tl::AbsoluteProgress m_progress;
+  std::list<GraphicsState> m_graphics_stack;
 
   void process_clear_polygons ();
+  void swap_graphics_state (GraphicsState &state);
 };
 
 /**
diff --git a/src/ext/ext/extRS274XApertures.cc b/src/ext/ext/extRS274XApertures.cc
index d8c5073b3..716fa593a 100644
--- a/src/ext/ext/extRS274XApertures.cc
+++ b/src/ext/ext/extRS274XApertures.cc
@@ -37,8 +37,8 @@ RS274XApertureBase::RS274XApertureBase ()
   // .. nothing yet ..
 }
 
-void 
-RS274XApertureBase::produce_flash (const db::DVector &d, RS274XReader &reader, db::EdgeProcessor &ep, bool clear)
+void
+RS274XApertureBase::produce_flash (const db::DCplxTrans &d, RS274XReader &reader, db::EdgeProcessor &ep, bool clear)
 {
   if (m_needs_update) {
 
@@ -65,18 +65,18 @@ RS274XApertureBase::produce_flash (const db::DVector &d, RS274XReader &reader, d
 
   }
 
-  db::CplxTrans trans = db::CplxTrans (reader.dbu ());
+  db::CplxTrans trans = d * db::CplxTrans (reader.dbu ());
 
   for (std::vector <db::Polygon>::const_iterator p = m_polygons.begin (); p != m_polygons.end (); ++p) {
-    reader.produce_polygon (p->transformed (trans).moved (d), clear);
+    reader.produce_polygon (p->transformed (trans), clear);
   }
   for (std::vector <db::Path>::const_iterator p = m_lines.begin (); p != m_lines.end (); ++p) {
-    reader.produce_line (p->transformed (trans).moved (d), clear);
+    reader.produce_line (p->transformed (trans), clear);
   }
 }
 
 void 
-RS274XApertureBase::produce_linear (const db::DPoint &from, const db::DPoint &to, RS274XReader &reader, db::EdgeProcessor &ep, bool clear) 
+RS274XApertureBase::produce_linear (const db::DCplxTrans &d, const db::DVector &dist, RS274XReader &reader, db::EdgeProcessor &ep, bool clear)
 {
   mp_reader = &reader;
   mp_ep = &ep;
@@ -88,6 +88,9 @@ RS274XApertureBase::produce_linear (const db::DPoint &from, const db::DPoint &to
   p.swap (m_polygons);
   cp.swap (m_clear_polygons);
 
+  db::DPoint from;
+  db::DPoint to = from + d.inverted () * dist;
+
   if (! do_produce_linear (from, to)) {
 
     // fallback: produce flash and employ a Minkowsky sum to generate the resulting structure
@@ -120,7 +123,7 @@ RS274XApertureBase::produce_linear (const db::DPoint &from, const db::DPoint &to
     m_clear_polygons.clear ();
   }
 
-  db::CplxTrans trans = db::CplxTrans (mp_reader->dbu ());
+  db::CplxTrans trans = d * db::CplxTrans (mp_reader->dbu ());
 
   for (std::vector <db::Polygon>::const_iterator p = m_polygons.begin (); p != m_polygons.end (); ++p) {
     mp_reader->produce_polygon (p->transformed (trans), clear);
@@ -157,7 +160,13 @@ RS274XApertureBase::add_point (const db::DPoint &d)
   m_points.push_back (db::Point (db::coord_traits<db::Coord>::rounded (d.x () / dbu), db::coord_traits<db::Coord>::rounded (d.y () / dbu)));
 }
 
-void 
+void
+RS274XApertureBase::add_point (const db::Point &p)
+{
+  m_points.push_back (p);
+}
+
+void
 RS274XApertureBase::produce_circle (double cx, double cy, double r, bool clear)
 {
   clear_points ();
@@ -531,6 +540,44 @@ RS274XRegularAperture::do_produce_linear (const db::DPoint & /*from*/, const db:
   return false;
 }
 
+// -----------------------------------------------------------------------------
+//  RS274XRegionAperture implementation
+
+RS274XRegionAperture::RS274XRegionAperture (const db::Region &region)
+  : m_region (region)
+{
+  //  .. nothing yet ..
+}
+
+void RS274XRegionAperture::do_produce_flash ()
+{
+  for (db::Region::const_iterator p = m_region.begin (); ! p.at_end (); ++p) {
+
+    db::Polygon poly = *p;
+
+    clear_points ();
+    for (db::Polygon::polygon_contour_iterator pt = poly.begin_hull (); pt != poly.end_hull (); ++pt) {
+      add_point (*pt);
+    }
+    produce_polygon (false);
+
+    for (size_t h = 0; h < poly.holes (); ++h) {
+      clear_points ();
+      for (db::Polygon::polygon_contour_iterator pt = poly.begin_hole (h); pt != poly.end_hole (h); ++pt) {
+        add_point (*pt);
+      }
+      produce_polygon (true);
+    }
+
+  }
+}
+
+bool
+RS274XRegionAperture::do_produce_linear (const db::DPoint & /*from*/, const db::DPoint & /*to*/)
+{
+  return false;
+}
+
 // -----------------------------------------------------------------------------
 //  RS274XMacroAperture implementation
 
@@ -592,9 +639,8 @@ RS274XMacroAperture::do_produce_flash_internal ()
 
       if (code == 1) {
 
-        int pol = 0;
         ex.expect (",");
-        ex.read (pol);
+        int pol = (read_expr (ex) > 0.5);
 
         if (pol == 0) {
           clear = true;
@@ -613,13 +659,18 @@ RS274XMacroAperture::do_produce_flash_internal ()
         ex.expect (",");
         double cy = read_expr (ex, true);
 
-        produce_circle (cx, cy, d * 0.5, clear);
+        double a = 0.0;
+        if (ex.test (",")) {
+          a = read_expr (ex);
+        }
+
+        db::DVector c = db::DCplxTrans (1.0, a, false, db::DVector ()) * db::DVector (cx, cy);
+        produce_circle (c.x (), c.y (), d * 0.5, clear);
 
       } else if (code == 2 || code == 20) {
 
-        int pol = 0;
         ex.expect (",");
-        ex.read (pol);
+        int pol = (read_expr (ex) > 0.5);
 
         if (pol == 0) {
           clear = true;
@@ -671,9 +722,8 @@ RS274XMacroAperture::do_produce_flash_internal ()
 
       } else if (code == 21 || code == 22) {
 
-        int pol = 0;
         ex.expect (",");
-        ex.read (pol);
+        int pol = (read_expr (ex) > 0.5);
 
         if (pol == 0) {
           clear = true;
@@ -715,9 +765,8 @@ RS274XMacroAperture::do_produce_flash_internal ()
 
       } else if (code == 4) {
 
-        int pol = 0;
         ex.expect (",");
-        ex.read (pol);
+        int pol = (read_expr (ex) > 0.5);
 
         if (pol == 0) {
           clear = true;
@@ -804,9 +853,8 @@ RS274XMacroAperture::do_produce_flash_internal ()
 
       } else if (code == 5) {
 
-        int pol = 0;
         ex.expect (",");
-        ex.read (pol);
+        int pol = (read_expr (ex) > 0.5);
 
         if (pol == 0) {
           clear = true;
@@ -945,24 +993,28 @@ RS274XMacroAperture::do_produce_linear (const db::DPoint & /*from*/, const db::D
 double 
 RS274XMacroAperture::read_atom (tl::Extractor &ex)
 {
+  double fac = 1.0;
+  if (ex.test ("-")) {
+    fac = -1.0;
+  }
+
+  double d = 0.0;
+
   if (ex.test ("$")) {
     int nvar = 0;
     ex.read (nvar);
     nvar -= 1;
     if (nvar >= 0 && nvar < int (m_parameters.size ())) {
-      return m_parameters[nvar];
-    } else {
-      return 0.0;
+      d = m_parameters[nvar];
     }
   } else if (ex.test ("(")) {
-    double d = read_expr (ex);
+    d = read_expr (ex);
     ex.expect (")");
-    return d;
   } else {
-    double d = 0.0;
     ex.read (d);
-    return d;
   }
+
+  return fac * d;
 }
 
 double 
diff --git a/src/ext/ext/extRS274XApertures.h b/src/ext/ext/extRS274XApertures.h
index d73a0b501..2b4a0d204 100644
--- a/src/ext/ext/extRS274XApertures.h
+++ b/src/ext/ext/extRS274XApertures.h
@@ -28,6 +28,7 @@
 #include "dbPath.h"
 #include "dbPolygon.h"
 #include "dbTrans.h"
+#include "dbRegion.h"
 #include "tlStream.h"
 
 #include <vector>
@@ -48,13 +49,14 @@ public:
   RS274XApertureBase ();
   virtual ~RS274XApertureBase () { }
 
-  void produce_flash (const db::DVector &d, RS274XReader &reader, db::EdgeProcessor &ep, bool clear);
-  void produce_linear (const db::DPoint &from, const db::DPoint &to, RS274XReader &reader, db::EdgeProcessor &ep, bool clear);
+  void produce_flash (const db::DCplxTrans &d, RS274XReader &reader, db::EdgeProcessor &ep, bool clear);
+  void produce_linear (const db::DCplxTrans &d, const db::DVector &dist, RS274XReader &reader, db::EdgeProcessor &ep, bool clear);
 
 protected:
   void clear_points ();
   void add_point (double x, double y);
   void add_point (const db::DPoint &d);
+  void add_point (const db::Point &d);
   void produce_circle (double cx, double cy, double r, bool clear);
   void produce_polygon (bool clear);
   void produce_line ();
@@ -135,7 +137,20 @@ private:
   double m_hx, m_hy;
 };
 
-class RS274XMacroAperture 
+class RS274XRegionAperture
+  : public RS274XApertureBase
+{
+public:
+  RS274XRegionAperture (const db::Region &region);
+
+  virtual void do_produce_flash ();
+  virtual bool do_produce_linear (const db::DPoint &from, const db::DPoint &to);
+
+private:
+  db::Region m_region;
+};
+
+class RS274XMacroAperture
   : public RS274XApertureBase
 {
 public:
diff --git a/src/ext/ext/extRS274XReader.cc b/src/ext/ext/extRS274XReader.cc
index 4b4c67730..2a5b8f0de 100644
--- a/src/ext/ext/extRS274XReader.cc
+++ b/src/ext/ext/extRS274XReader.cc
@@ -79,12 +79,6 @@ RS274XReader::init ()
   m_buffer.clear ();
   m_polygon_points.clear ();
 
-  m_ox = m_oy = 0.0;
-  m_sx = m_sy = 1.0;
-  m_mx = m_my = false;
-  m_rot = 0.0;
-  update_trans ();
-
   for (std::vector<RS274XApertureBase *>::const_iterator a = m_apertures.begin (); a != m_apertures.end (); ++a) {
     if (*a) {
       delete *a;
@@ -146,6 +140,26 @@ RS274XReader::do_read ()
           read_pf_parameter (get_block ());
         } else if (param == "AD") {
           read_ad_parameter (get_block ());
+        } else if (param == "AB") {
+
+          std::string dcode = get_block ();
+          if (dcode.empty ()) {
+
+            if (graphics_stack_empty ()) {
+              throw tl::Exception (tl::to_string (QObject::tr ("AB closed without initial opening AB command")));
+            } else {
+              db::Region region;
+              collect (region);
+              std::string ap = pop_state ();
+              install_block_aperture (ap, region);
+            }
+
+          } else if (m_polygon_mode) {
+            warn (tl::to_string (QObject::tr ("AB command inside polygon sequence (G36/G37) - polygon ignored")));
+          } else {
+            push_state (dcode);
+          }
+
         } else if (param == "AM") {
 
           //  AM parameters can span multiple data blocks, so collect them
@@ -164,6 +178,12 @@ RS274XReader::do_read ()
           read_ln_parameter (get_block ());
         } else if (param == "LP") {
           read_lp_parameter (get_block ());
+        } else if (param == "LM") {
+          read_lm_parameter (get_block ());
+        } else if (param == "LR") {
+          read_lr_parameter (get_block ());
+        } else if (param == "LS") {
+          read_ls_parameter (get_block ());
         } else if (param == "SR") {
           read_sr_parameter (get_block ());
         } else if (param == "IF") {
@@ -385,7 +405,7 @@ RS274XReader::do_read ()
           if (m_polygon_mode) {
             warn (tl::to_string (QObject::tr ("D03 blocks are ignored in polygon mode")));
           } else {
-            m_current_aperture->produce_flash (db::DVector (x, y), *this, ep (), is_clear_polarity ());
+            m_current_aperture->produce_flash (db::DCplxTrans (db::DVector (x, y)) * object_trans (), *this, ep (), is_clear_polarity ());
           }
 
         } else { // only if m_current_dcode == 1?
@@ -479,7 +499,7 @@ RS274XReader::do_read ()
                       throw tl::Exception (tl::to_string (QObject::tr ("No aperture defined (missing G54 block)")));
                     }
 
-                    m_current_aperture->produce_linear (db::DPoint (m_x, m_y), pe, *this, ep (), is_clear_polarity ());
+                    m_current_aperture->produce_linear (db::DCplxTrans (db::DVector (m_x, m_y)) * object_trans (), pe - db::DPoint (m_x, m_y), *this, ep (), is_clear_polarity ());
 
                   }
 
@@ -508,7 +528,7 @@ RS274XReader::do_read ()
                 throw tl::Exception (tl::to_string (QObject::tr ("No aperture defined (missing G54 block)")));
               }
 
-              m_current_aperture->produce_linear (db::DPoint (m_x, m_y), db::DPoint (x, y), *this, ep (), is_clear_polarity ());
+              m_current_aperture->produce_linear (db::DCplxTrans (db::DVector (m_x, m_y)) * object_trans (), db::DPoint (x, y) - db::DPoint (m_x, m_y), *this, ep (), is_clear_polarity ());
 
             }
 
@@ -527,6 +547,9 @@ RS274XReader::do_read ()
 
   }
 
+  if (! graphics_stack_empty ()) {
+    throw tl::Exception (tl::to_string (QObject::tr ("AB block not closed")));
+  }
 }
 
 void
@@ -550,25 +573,6 @@ RS274XReader::get_block ()
   return m_buffer;
 }
 
-void
-RS274XReader::update_trans ()
-{
-  if (fabs (m_sx - m_sy) > 1e-6) {
-    throw tl::Exception (tl::to_string (QObject::tr ("Different scalings for x and y axis is not supported currently.")));
-  }
-
-  // TODO: is this order correct?
-  db::DCplxTrans lt = db::DCplxTrans (m_sx, m_rot, false, db::DVector (m_ox, m_oy));
-  if (m_mx) {
-    lt *= db::DCplxTrans (db::DTrans (db::FTrans::m0));
-  }
-  if (m_my) {
-    lt *= db::DCplxTrans (db::DTrans (db::FTrans::m90));
-  }
-
-  set_local_trans (lt);
-}
-
 void
 RS274XReader::read_as_parameter (const std::string &block)
 {
@@ -648,14 +652,14 @@ RS274XReader::read_mi_parameter (const std::string &block)
   ex.read (mb);
   ex.expect_end ();
 
-  m_mx = (ma != 0);
-  m_my = (mb != 0);
+  bool mx = (ma != 0);
+  bool my = (mb != 0);
 
   if (m_axis_mapping != ab_xy) {
-    std::swap (m_mx, m_my);
+    std::swap (mx, my);
   }
 
-  update_trans ();
+  update_local_mirror (mx, my);
 }
 
 void
@@ -686,14 +690,14 @@ RS274XReader::read_of_parameter (const std::string &block)
   bo *= unit ();
   ex.expect_end ();
 
-  m_ox = ao;
-  m_oy = bo;
+  double ox = ao;
+  double oy = bo;
 
   if (m_axis_mapping != ab_xy) {
-    std::swap (m_ox, m_oy);
+    std::swap (ox, oy);
   }
 
-  update_trans ();
+  update_local_offset (ox, oy);
 }
 
 void
@@ -702,18 +706,63 @@ RS274XReader::read_sf_parameter (const std::string &block)
   tl::Extractor ex (block.c_str ());
 
   ex.expect ("A");
-  m_sx = 1.0;
-  ex.read (m_sx);
+  double sx = 1.0;
+  ex.read (sx);
   ex.expect ("B");
-  m_sy = 1.0;
-  ex.read (m_sy);
+  double sy = 1.0;
+  ex.read (sy);
   ex.expect_end ();
 
   if (m_axis_mapping != ab_xy) {
-    std::swap (m_sx, m_sy);
+    std::swap (sx, sy);
   }
 
-  update_trans ();
+  if (fabs (sx - sy) > 1e-6) {
+    throw tl::Exception (tl::to_string (QObject::tr ("Different scalings for x and y axis is not supported currently.")));
+  }
+
+  update_local_scale (sx);
+}
+
+void
+RS274XReader::read_ls_parameter (const std::string &block)
+{
+  tl::Extractor ex (block.c_str ());
+
+  double s = 1.0;
+  ex.read (s);
+
+  update_object_scale (s);
+}
+
+void
+RS274XReader::read_lr_parameter (const std::string &block)
+{
+  tl::Extractor ex (block.c_str ());
+
+  double a = 0.0;
+  ex.read (a);
+
+  update_object_angle (a);
+}
+
+void
+RS274XReader::read_lm_parameter (const std::string &block)
+{
+  tl::Extractor ex (block.c_str ());
+
+  bool omx = false, omy = false;
+  while (! ex.at_end ()) {
+    if (ex.test ("X")) {
+      omy = true;  //  "my == mirror at y axis" is "X == mirror along x axis"
+    } else if (ex.test ("Y")) {
+      omx = true;  //  "mx == mirror at x axis" is "Y == mirror along y axis"
+    } else {
+      break;
+    }
+  }
+
+  update_object_mirror (omx, omy);
 }
 
 void
@@ -744,14 +793,14 @@ RS274XReader::read_io_parameter (const std::string &block)
   bo *= unit ();
   ex.expect_end ();
 
-  m_ox = ao;
-  m_oy = bo;
+  double ox = ao;
+  double oy = bo;
 
   if (m_axis_mapping != ab_xy) {
-    std::swap (m_ox, m_oy);
+    std::swap (ox, oy);
   }
 
-  update_trans ();
+  update_local_offset (ox, oy);
 }
 
 void
@@ -773,9 +822,9 @@ RS274XReader::read_ir_parameter (const std::string &block)
 {
   tl::Extractor ex (block.c_str ());
 
-  m_rot = 0.0;
-  ex.read (m_rot);
-  ex.expect_end ();
+  double rot = 0.0;
+  ex.read (rot);
+  update_local_angle (rot);
 }
 
 void
@@ -827,6 +876,31 @@ RS274XReader::read_ad_parameter (const std::string &block)
   }
 }
 
+void
+RS274XReader::install_block_aperture (const std::string &d, const db::Region &region)
+{
+  int dcode = 0;
+
+  try {
+    tl::Extractor ex (d.c_str ());
+    ex.expect ("D");
+    ex.read (dcode);
+    ex.expect_end ();
+  } catch (...) {
+    throw tl::Exception (tl::to_string (QObject::tr ("Invalid aperture code string for AB command")));
+  }
+
+  if (dcode < 0) {
+    throw tl::Exception (tl::to_string (QObject::tr ("Invalid D code for AB command")));
+  }
+
+  while (int (m_apertures.size ()) <= dcode) {
+    m_apertures.push_back (0);
+  }
+
+  m_apertures[dcode] = new RS274XRegionAperture (region);
+}
+
 void
 RS274XReader::read_am_parameter (const std::string &block)
 {
diff --git a/src/ext/ext/extRS274XReader.h b/src/ext/ext/extRS274XReader.h
index 60ff91a52..e4200dc0c 100644
--- a/src/ext/ext/extRS274XReader.h
+++ b/src/ext/ext/extRS274XReader.h
@@ -66,10 +66,6 @@ private:
   bool m_guess_polarity;
   bool m_neg_polarity;
   bool m_360deg_circular;
-  double m_sx, m_sy;
-  double m_rot;
-  bool m_mx, m_my;
-  double m_ox, m_oy;
   double m_x, m_y;
   bool m_relative;
   std::string m_buffer;
@@ -99,13 +95,16 @@ private:
   void read_ad_parameter (const std::string &block);
   void read_am_parameter (const std::string &block);
   void read_ko_parameter (const std::string &block);
+  void read_lm_parameter (const std::string &block);
+  void read_lr_parameter (const std::string &block);
+  void read_ls_parameter (const std::string &block);
   void read_ln_parameter (const std::string &block);
   void read_lp_parameter (const std::string &block);
   void read_sr_parameter (const std::string &block);
   void read_if_parameter (const std::string &block);
+  void install_block_aperture (const std::string &dcode, const db::Region &region);
   void process_mcode (int mcode);
   const std::string &get_block ();
-  void update_trans ();
   bool is_clear_polarity ();
   void init ();
 };