fixed a potential bug in fill zone.

Tried to fix a problem under Vista and Window 7 in fill zone: sometimes Pcbnew crashes.
Could be a bug in Kbool (see changelog).

CHANGELOG.txt

@@ -3,6 +3,27 @@ KiCad ChangeLog 2009
 
 Please add newer entries at the top, list the date and your name with
 email address.
+2010-Jan-03 UPDATE Jean-Pierre Charras <jean-pierre.charras@gipsa-lab.inpg.fr>
+================================================================================
+++pcbnew
+    - fixed a potential bug in a fill zone function: AddClearanceAreasPolygonsToPolysList()
+    - Try to fix a problem with AddClearanceAreasPolygonsToPolysList() in Window Vista a Window 7
+      This is perhaps a problem in kbool library
+      (a bug in Bool_Engine destructor ?
+      Its happens when:
+      - a lot of polygon corners are added in group A
+      - nothing in group B
+      - No operation asked in kbool engine ( that also has a bug if an operation is asked
+        with no polygon in group B)
+      - and call the Bool_Engine destructor.
+      Could be a stack error or overflow, very hard to locate and debug.
+      - Under Vista seems create always a crash.
+      - Under Window 7 sometimes create a crash.
+      - No problem under XP and Linux.
+    -Workaround:
+      Leave the group A void if group B is void.
+      I am not sure this fix the problem.
+      Just its solves this problem with 2 samples boards that crash Pcbnew without this change.
 
 2010-Jan-01 UPDATE Jean-Pierre Charras <jean-pierre.charras@gipsa-lab.inpg.fr>
 ================================================================================

include/kicad_device_context.h

@@ -8,7 +8,7 @@
 
 // Comment this line to use the standard wxClientDC
 // and uncomment to use buffered DC
-// #define KICAD_USE_BUFFERED_DC    // Currently for tests
+// #define KICAD_USE_BUFFERED_DC    // Currently under test
 
 #ifdef KICAD_USE_BUFFERED_DC
 #include <wx/dcbuffer.h>

pcbnew/zones_convert_brd_items_to_polygons.cpp

@@ -177,11 +177,6 @@ void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList( BOARD* aPcb )
     booleng = new Bool_Engine();
     ArmBoolEng( booleng, true );
 
-    /* Add the main corrected polygon (i.e. the filled area using only one outline)
-     * in GroupA in Bool_Engine
-     */
-    CopyPolygonsFromFilledPolysListToBoolengine( booleng, GROUP_A );
-
     /* Calculates the clearance value that meet DRC requirements
      * from m_ZoneClearance and clearance from the corresponding netclass
      * We have a "local" clearance in zones because most of time
@@ -218,6 +213,7 @@ void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList( BOARD* aPcb )
      */
     int item_clearance;
     have_poly_to_substract = false;
+
     for( MODULE* module = aPcb->m_Modules;  module;  module = module->Next() )
     {
         for( D_PAD* pad = module->m_Pads; pad != NULL; pad = pad->Next() )
@@ -254,8 +250,6 @@ void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList( BOARD* aPcb )
         }
     }
 
-    have_poly_to_substract = false;
-
     /* Add holes (i.e. tracks and pads areas as polygons outlines)
      * in GroupB in Bool_Engine
      * Next : Add tracks and vias
@@ -371,6 +365,11 @@ void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList( BOARD* aPcb )
 
     if( have_poly_to_substract )
     {
+        /* Add the main corrected polygon (i.e. the filled area using only one outline)
+         * in GroupA in Bool_Engine
+         */
+        CopyPolygonsFromFilledPolysListToBoolengine( booleng, GROUP_A );
+
         booleng->Do_Operation( BOOL_A_SUB_B );
 
         /* put these areas in m_FilledPolysList */
@@ -461,10 +460,6 @@ void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList( BOARD* aPcb )
     booleng = new Bool_Engine();
     ArmBoolEng( booleng, true );
 
-/* Add the main corrected polygon (i.e. the filled area using only one outline)
- * in GroupA in Bool_Engine
- */
-    CopyPolygonsFromFilledPolysListToBoolengine( booleng, GROUP_A );
 
 /*
  * Test and add polygons to remove thermal stubs.
@@ -586,6 +581,11 @@ void ZONE_CONTAINER::AddClearanceAreasPolygonsToPolysList( BOARD* aPcb )
 /* compute copper areas */
     if( have_poly_to_substract )
     {
+    /* Add the main corrected polygon (i.e. the filled area using only one outline)
+     * in GroupA in Bool_Engine
+     */
+        CopyPolygonsFromFilledPolysListToBoolengine( booleng, GROUP_A );
+
         booleng->Do_Operation( BOOL_A_SUB_B );
 
         /* put these areas in m_FilledPolysList */

polygon/math_for_graphics.cpp

@@ -813,9 +813,13 @@ int GetClearanceBetweenSegments( int x1i, int y1i, int x1f, int y1f, int style1,
 	const int NSTEPS = 32;
 
 	if( el1.theta2 > el1.theta1 )
+    {
 		wxASSERT(0);
+    }
 	if( bArcs && el2.theta2 > el2.theta1 )
+    {
 		wxASSERT(0);
+    }
 
 	// test multiple points in both segments
 	double th1;
@@ -1012,7 +1016,9 @@ double Distance( int x1, int y1, int x2, int y2 )
 	double d;
 	d = sqrt( (double)(x1-x2)*(x1-x2) + (double)(y1-y2)*(y1-y2) );
 	if( d > INT_MAX || d < INT_MIN )
+    {
 		wxASSERT(0);
+    }
 	return (int)d;
 }
 
@@ -1023,9 +1029,13 @@ int GetArcIntersections( EllipseKH * el1, EllipseKH * el2,
 						double * x1, double * y1, double * x2, double * y2 )
 {
 	if( el1->theta2 > el1->theta1 )
+    {
 		wxASSERT(0);
+    }
 	if( el2->theta2 > el2->theta1 )
+    {
 		wxASSERT(0);
+    }
 
 	const int NSTEPS = 32;
 	double xret[2], yret[2];
@@ -1079,7 +1089,9 @@ int GetArcIntersections( EllipseKH * el1, EllipseKH * el2,
 					yret[n] = y*el1->yrad + el1->Center.Y;
 					n++;
 					if( n > 2 )
+                    {
 						wxASSERT(0);
+                    }
 				}
 			}
 		}
@@ -1106,9 +1118,13 @@ double GetArcClearance( EllipseKH * el1, EllipseKH * el2,
 	const int NSTEPS = 32;
 
 	if( el1->theta2 > el1->theta1 )
+    {
 		wxASSERT(0);
+    }
 	if( el2->theta2 > el2->theta1 )
+    {
 		wxASSERT(0);
+    }
 
 	// test multiple positions in both arcs, moving clockwise (ie. decreasing theta)
 	double th_start = el1->theta1;