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diff --git a/gerbview/class_aperture_macro.h b/gerbview/class_aperture_macro.h
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+/**
+ * @file class_aperture_macro.h
+ */
+
+#ifndef _APERTURE_MACRO_H_
+#define _APERTURE_MACRO_H_
+
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 1992-2010 Jean-Pierre Charras <jean-pierre.charras@gipsa-lab.inpg.fr>
+ * Copyright (C) 2010 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
+ * Copyright (C) 1992-2010 KiCad Developers, see change_log.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <vector>
+#include <set>
+
+#include <base_struct.h>
+#include <class_am_param.h>
+
+/*
+ *  An aperture macro defines a complex shape and is a list of aperture primitives.
+ *  Each aperture primitive defines a simple shape (circle, rect, regular polygon...)
+ *  Inside a given aperture primitive, a fixed list of parameters defines info
+ *  about the shape: size, thickness, number of vertex ...
+ *
+ *  Each parameter can be an immediate value or a defered value.
+ *  When value is defered, it is defined when the aperture macro is instancied by
+ *  an ADD macro command
+ *  Note also a defered parameter can be defined in aperture macro,
+ *  but outside aperture primitives. Example
+ *  %AMRECTHERM*
+ *  $4=$3/2*    parameter $4 is half value of parameter $3
+ *  21,1,$1-$3,$2-$3,0-$1/2-$4,0-$2/2-$4,0*
+ *  For the aperture primitive, parameters $1 to $3 will be defined in ADD command,
+ *  and $4 is defined inside the macro
+ */
+
+/**
+ * Enum AM_PRIMITIVE_ID
+ * is the set of all "aperture macro primitives" (primitive numbers).  See
+ * Table 3 in http://gerbv.sourceforge.net/docs/rs274xrevd_e.pdf
+ * aperture macro primitives are basic shapes which can be combined to create a complex shape
+ * This complex shape is flashed.
+ */
+enum AM_PRIMITIVE_ID {
+    AMP_UNKNOWN = -1,           // A value for uninitialized AM_PRIMITIVE.
+    AMP_COMMENT = 0,            // A primitive description is not really a primitive, this is a comment
+    AMP_CIRCLE  = 1,            // Circle. (diameter and position)
+    AMP_LINE2   = 2,            // Line with rectangle ends. (Width, start and end pos + rotation)
+    AMP_LINE20  = 20,           // Same as AMP_LINE2
+    AMP_LINE_CENTER = 21,       // Rectangle. (height, width and center pos + rotation)
+    AMP_LINE_LOWER_LEFT = 22,   // Rectangle. (height, width and left bottom corner pos + rotation)
+    AMP_EOF     = 3,            // End Of File marquer: not really a shape
+    AMP_OUTLINE = 4,            // Free polyline (n corners + rotation)
+    AMP_POLYGON = 5,            // Closed regular polygon(diameter, number of vertices (3 to 10), rotation)
+    AMP_MOIRE   = 6,            // A cross hair with n concentric circles + rotation
+    AMP_THERMAL = 7             // Thermal shape (pos, outer and inner diameter, cross hair thickness + rotation)
+};
+
+
+/**
+ * Struct AM_PRIMITIVE
+ * holds an aperture macro primitive as given in Table 3 of
+ * http://gerbv.sourceforge.net/docs/rs274xrevd_e.pdf
+ */
+class AM_PRIMITIVE
+{
+public:
+    AM_PRIMITIVE_ID primitive_id;       ///< The primitive type
+    AM_PARAMS       params;             ///< A sequence of parameters used by
+                                        //   the primitive
+    bool            m_GerbMetric;       // units for this primitive:
+                                        // false = Inches, true = metric
+public: AM_PRIMITIVE( bool aGerbMetric, AM_PRIMITIVE_ID aId = AMP_UNKNOWN )
+    {
+        primitive_id = aId;
+        m_GerbMetric = aGerbMetric;
+    }
+
+
+    ~AM_PRIMITIVE() {}
+
+    /**
+     * Function GetExposure
+     * returns the first parameter in integer form.  Some but not all primitives
+     * use the first parameter as an exposure control.
+     */
+    int  GetExposure( GERBER_DRAW_ITEM* aParent ) const;
+
+    /**
+     * Function mapExposure
+     * translates the first parameter from an aperture macro into a current
+     * exposure setting.
+     * @param aParent = a GERBER_DRAW_ITEM that handle:
+     *    ** m_Exposure A dynamic setting which can change throughout the
+     *          reading of the gerber file, and it indicates whether the current tool
+     *          is lit or not.
+     *    ** m_ImageNegative A dynamic setting which can change throughout the reading
+     *          of the gerber file, and it indicates whether the current D codes are to
+     *          be interpreted as erasures or not.
+     * @return true to draw with current color, false to draw with alt color (erase)
+     */
+    bool mapExposure( GERBER_DRAW_ITEM* aParent );
+
+    /* Draw functions: */
+
+    /**
+     * Function DrawBasicShape
+     * Draw the primitive shape for flashed items.
+     * @param aParent = the parent GERBER_DRAW_ITEM which is actually drawn
+     * @param aClipBox = DC clip box (NULL is no clip)
+     * @param aDC = device context
+     * @param aColor = the normal color to use
+     * @param aAltColor = the color used to draw with "reverse" exposure mode (used in aperture macros only)
+     * @param aShapePos = the actual shape position
+     * @param aFilledShape = true to draw in filled mode, false to draw in skecth mode
+     */
+    void DrawBasicShape( GERBER_DRAW_ITEM* aParent, EDA_RECT* aClipBox, wxDC* aDC,
+                         EDA_COLOR_T aColor, EDA_COLOR_T aAltColor, wxPoint aShapePos, bool aFilledShape );
+
+    /** GetShapeDim
+     * Calculate a value that can be used to evaluate the size of text
+     * when displaying the D-Code of an item
+     * due to the complexity of the shape of some primitives
+     * one cannot calculate the "size" of a shape (only a bounding box)
+     * but here, the "dimension" of the shape is the diameter of the primitive
+     * or for lines the width of the line
+     * @param aParent = the parent GERBER_DRAW_ITEM which is actually drawn
+     * @return a dimension, or -1 if no dim to calculate
+     */
+    int  GetShapeDim( GERBER_DRAW_ITEM* aParent );
+
+private:
+
+    /**
+     * Function ConvertShapeToPolygon
+     * convert a shape to an equivalent polygon.
+     * Arcs and circles are approximated by segments
+     * Useful when a shape is not a graphic primitive (shape with hole,
+     * rotated shape ... ) and cannot be easily drawn.
+     */
+    void ConvertShapeToPolygon( GERBER_DRAW_ITEM* aParent, std::vector<wxPoint>& aBuffer );
+};
+
+
+typedef std::vector<AM_PRIMITIVE> AM_PRIMITIVES;
+
+/**
+ * Struct APERTURE_MACRO
+ * helps support the "aperture macro" defined within standard RS274X.
+ */
+struct APERTURE_MACRO
+{
+    wxString      name;             ///< The name of the aperture macro
+    AM_PRIMITIVES primitives;       ///< A sequence of AM_PRIMITIVEs
+
+    /*  A defered parameter can be defined in aperture macro,
+     *  but outside aperture primitives. Example
+     *  %AMRECTHERM*
+     *  $4=$3/2*    parameter $4 is half value of parameter $3
+     * m_localparamStack handle a list of local defered parameters
+     */
+    AM_PARAMS m_localparamStack;
+
+    /**
+     * function GetLocalParam
+     * Usually, parameters are defined inside the aperture primitive
+     * using immediate mode or defered mode.
+     * in defered mode the value is defined in a DCODE that want to use the aperture macro.
+     * But some parameters are defined outside the aperture primitive
+     * and are local to the aperture macro
+     * @return the value of a defered parameter defined inside the aperture macro
+     * @param aDcode = the D_CODE that uses this apertur macro and define defered parameters
+     * @param aParamId = the param id (defined by $3 or $5 ..) to evaluate
+     */
+    double GetLocalParam( const D_CODE* aDcode, unsigned aParamId ) const;
+
+   /**
+     * Function DrawApertureMacroShape
+     * Draw the primitive shape for flashed items.
+     * When an item is flashed, this is the shape of the item
+     * @param aParent = the parent GERBER_DRAW_ITEM which is actually drawn
+     * @param aClipBox = DC clip box (NULL is no clip)
+     * @param aDC = device context
+     * @param aColor = the normal color to use
+     * @param aAltColor = the color used to draw with "reverse" exposure mode (used in aperture macros only)
+     * @param aShapePos = the actual shape position
+     * @param aFilledShape = true to draw in filled mode, false to draw in skecth mode
+     */
+    void DrawApertureMacroShape( GERBER_DRAW_ITEM* aParent, EDA_RECT* aClipBox, wxDC* aDC,
+                                 EDA_COLOR_T aColor, EDA_COLOR_T aAltColor, wxPoint aShapePos, bool aFilledShape );
+
+    /**
+     * Function GetShapeDim
+     * Calculate a value that can be used to evaluate the size of text
+     * when displaying the D-Code of an item
+     * due to the complexity of a shape using many primitives
+     * one cannot calculate the "size" of a shape (only abounding box)
+     * but most of aperture macro are using one or few primitives
+     * and the "dimension" of the shape is the diameter of the primitive
+     * (or the max diameter of primitives)
+     * @param aParent = the parent GERBER_DRAW_ITEM which is actually drawn
+     * @return a dimension, or -1 if no dim to calculate
+     */
+    int  GetShapeDim( GERBER_DRAW_ITEM* aParent );
+
+    /**
+     * Function HasNegativeItems
+     * @param aParent = the parent GERBER_DRAW_ITEM which is actually drawn
+     * @return true if this macro has at least one shape (using aperture primitives)
+     *    must be drawn in background color
+     * used to optimize screen refresh (when no items are in background color
+     * refresh can be faster)
+     */
+    bool HasNegativeItems( GERBER_DRAW_ITEM* aParent );
+};
+
+
+/**
+ * Struct APERTURE_MACRO_less_than
+ * is used by std:set<APERTURE_MACRO> instantiation which uses
+ * APERTURE_MACRO.name as its key.
+ */
+struct APERTURE_MACRO_less_than
+{
+    // a "less than" test on two APERTURE_MACROs (.name wxStrings)
+    bool operator()( const APERTURE_MACRO& am1, const APERTURE_MACRO& am2 ) const
+    {
+        return am1.name.Cmp( am2.name ) < 0;  // case specific wxString compare
+    }
+};
+
+
+/**
+ * Type APERTURE_MACRO_SET
+ * is a sorted collection of APERTURE_MACROS whose key is the name field in
+ * the APERTURE_MACRO.
+ */
+typedef std::set<APERTURE_MACRO, APERTURE_MACRO_less_than> APERTURE_MACRO_SET;
+typedef std::pair<APERTURE_MACRO_SET::iterator, bool>      APERTURE_MACRO_SET_PAIR;
+
+
+#endif  // ifndef _APERTURE_MACRO_H_