fdo#81356: convert Fraction to boost::rational<long> - wip

* Added rational util functions used by Fraction class not
available in the boost::rational class.
* Replaced usage of Fraction by boost::rational<long>
* Removed code that relies on:
1. fraction.IsValid() -- rational only allow valid values, ie
denominator() != 0
2. rational.denominator() == 0 -- always false
3. rational.denominator() < 0 -- always false but implementation
detail: http://www.boost.org/doc/libs/release/libs/rational/rational.html#Internal%20representation
* Simplified code that relies on:
1. rational.denominator() != 0 -- always true
* BUGS EXIST because Fraction allows the creation of invalid values but
boost::rational throws the exception boost::bad_rational

Change-Id: I84970a4956afb3f91ac0c8f726547466319420f9
Reviewed-on: https://gerrit.libreoffice.org/11551
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

4 files changed, 12 insertions, 12 deletions

diff --git a/include/vcl/gdimtf.hxx b/include/vcl/gdimtf.hxx
index 5a80213a7550..128895fc0675 100644
--- a/include/vcl/gdimtf.hxx
+++ b/include/vcl/gdimtf.hxx
@@ -136,7 +136,7 @@ public:
     // additional Move method getting specifics how to handle MapMode( MAP_PIXEL )
     void            Move( long nX, long nY, long nDPIX, long nDPIY );
     void            Scale( double fScaleX, double fScaleY );
-    void            Scale( const Fraction& rScaleX, const Fraction& rScaleY );
+    void            Scale( const boost::rational<long>& rScaleX, const boost::rational<long>& rScaleY );
     void            Rotate( long nAngle10 );
     void            Clip( const Rectangle& );
     /* get the bound rect of the contained actions
diff --git a/include/vcl/mapmod.hxx b/include/vcl/mapmod.hxx
index 10e06d2e9ca3..211727f39660 100644
--- a/include/vcl/mapmod.hxx
+++ b/include/vcl/mapmod.hxx
@@ -21,7 +21,7 @@
 #define INCLUDED_VCL_MAPMOD_HXX
 
 #include <tools/gen.hxx>
-#include <tools/fract.hxx>
+#include <tools/rational.hxx>
 #include <tools/solar.h>
 #include <vcl/dllapi.h>
 #include <tools/resid.hxx>
@@ -44,8 +44,8 @@ private:
     sal_uLong           mnRefCount;
     MapUnit         meUnit;
     Point           maOrigin;
-    Fraction        maScaleX;
-    Fraction        maScaleY;
+    boost::rational<long>        maScaleX;
+    boost::rational<long>        maScaleY;
     bool            mbSimple;
 
     friend SvStream& ReadImplMapMode( SvStream& rIStm, ImplMapMode& rMapMode );
@@ -75,7 +75,7 @@ public:
                     MapMode( const MapMode& rMapMode );
                     MapMode( MapUnit eUnit );
                     MapMode( MapUnit eUnit, const Point& rLogicOrg,
-                             const Fraction& rScaleX, const Fraction& rScaleY );
+                             const boost::rational<long>& rScaleX, const boost::rational<long>& rScaleY );
                     ~MapMode();
 
     void            SetMapUnit( MapUnit eUnit );
@@ -86,11 +86,11 @@ public:
     const Point&    GetOrigin() const
                         { return mpImplMapMode->maOrigin; }
 
-    void            SetScaleX( const Fraction& rScaleX );
-    const Fraction& GetScaleX() const
+    void            SetScaleX( const boost::rational<long>& rScaleX );
+    const boost::rational<long>&  GetScaleX() const
                         { return mpImplMapMode->maScaleX; }
-    void            SetScaleY( const Fraction& rScaleY );
-    const Fraction& GetScaleY() const
+    void            SetScaleY( const boost::rational<long>& rScaleY );
+    const boost::rational<long>&  GetScaleY() const
                         { return mpImplMapMode->maScaleY; }
 
     MapMode&        operator=( const MapMode& rMapMode );
diff --git a/include/vcl/virdev.hxx b/include/vcl/virdev.hxx
index 624cb2f0f31a..4886410bd2aa 100644
--- a/include/vcl/virdev.hxx
+++ b/include/vcl/virdev.hxx
@@ -124,7 +124,7 @@ public:
 
     bool                SetOutputSizePixel( const Size& rNewSize, bool bErase = true );
     bool                SetOutputSizePixelScaleOffsetAndBuffer( const Size& rNewSize,
-                                                                const Fraction& rScale,
+                                                                const boost::rational<long>& rScale,
                                                                 const Point& rNewOffset,
                                                                 const basebmp::RawMemorySharedArray &pBuffer,
                                                                 const bool bTopDown = false );
diff --git a/include/vcl/window.hxx b/include/vcl/window.hxx
index decc15c1c88e..14c23bdfbcff 100644
--- a/include/vcl/window.hxx
+++ b/include/vcl/window.hxx
@@ -1009,8 +1009,8 @@ public:
     void                                SetCursor( vcl::Cursor* pCursor );
     vcl::Cursor*                        GetCursor() const;
 
-    void                                SetZoom( const Fraction& rZoom );
-    const Fraction&                     GetZoom() const;
+    void                                SetZoom( const boost::rational<long>& rZoom );
+    const boost::rational<long>&        GetZoom() const;
     bool                                IsZoom() const;
     long                                CalcZoom( long n ) const;