1 files changed, 24 insertions, 4 deletions

diff --git a/noncore/unsupported/qpdf/fixed.h b/noncore/unsupported/qpdf/fixed.h
index 111b95e..c912954 100644
--- a/noncore/unsupported/qpdf/fixed.h
+++ b/noncore/unsupported/qpdf/fixed.h
@@ -120,6 +120,10 @@ private:
         friend bool operator >= <> ( int i, const fixed &f );
         friend bool operator == <> ( int i, const fixed &f );
         friend bool operator != <> ( int i, const fixed &f );
+        
+        friend long int lrint ( const fixed &f );
+        friend fixed sqrt ( const fixed &f );
+        friend fixed fabs ( const fixed &f );
 #endif
 };
 
@@ -149,15 +153,31 @@ template <unsigned int SH> inline bool operator >= ( int i, const fixed<SH> &f )
 template <unsigned int SH> inline bool operator == ( int i, const fixed<SH> &f ) { return fixed<SH>::i2f( i ) == f. m_f; }
 template <unsigned int SH> inline bool operator != ( int i, const fixed<SH> &f ) { return fixed<SH>::i2f( i ) != f. m_f; }
 
-
-template <unsigned int SH> inline fixed<SH> sqrt ( const fixed<SH> &f )
+template <unsigned int SH> inline long int lrint ( const fixed<SH> &f )
 {
-        return fixed<SH> ( double( sqrt ( double( f ))));
+        return fixed<SH>::f2i (( f. m_f < 0 ) ? f. m_f - ( 1 << ( SH - 1 )) : f. m_f + ( 1 << ( SH - 1 )));
 }
 
 template <unsigned int SH> inline fixed<SH> fabs ( const fixed<SH> &f )
 {
-        return ( f < 0 ) ? -f : f;
+        return ( f. m_f < 0 ) ? fixed<SH> ( -f. m_f, true ) : f;
+}
+
+// roughly from QPE / qmath.h 
+template <unsigned int SH> inline fixed<SH> sqrt ( const fixed<SH> &f )
+{
+        if ( f. m_f <= 0 )
+                return fixed<SH> ( 0, true );
+                
+        fixed<SH>::fix_t a0 = 0;
+        fixed<SH>::fix_t a1 = f. m_f; // take value as first approximation
+        
+        do {
+                a0 = a1;
+                a1 = ( a0 + fixed<SH>::div ( f. m_f, a0 )) >> 1;
+        } while ( abs ( fixed<SH>::div ( a1 - a0,  a1 )) > 1 );
+        
+        return fixed<SH> ( a1, true );
 }
 
 template <unsigned int SH> inline ostream &operator << ( ostream &o, const fixed<SH> &f )