ft_corner_orientation	(	FT_Pos	in_x,
		FT_Pos	in_y,
		FT_Pos	out_x,
		FT_Pos	out_y
	)
Definition at line 840 of file ftcalc.c.
00844   {
00845     FT_Long  result; /* avoid overflow on 16-bit system */
00846 
00847 
00848     /* deal with the trivial cases quickly */
00849     if ( in_y == 0 )
00850     {
00851       if ( in_x >= 0 )
00852         result = out_y;
00853       else
00854         result = -out_y;
00855     }
00856     else if ( in_x == 0 )
00857     {
00858       if ( in_y >= 0 )
00859         result = -out_x;
00860       else
00861         result = out_x;
00862     }
00863     else if ( out_y == 0 )
00864     {
00865       if ( out_x >= 0 )
00866         result = in_y;
00867       else
00868         result = -in_y;
00869     }
00870     else if ( out_x == 0 )
00871     {
00872       if ( out_y >= 0 )
00873         result = -in_x;
00874       else
00875         result =  in_x;
00876     }
00877     else /* general case */
00878     {
00879 #ifdef FT_LONG64
00880 
00881       FT_Int64  delta = (FT_Int64)in_x * out_y - (FT_Int64)in_y * out_x;
00882 
00883 
00884       if ( delta == 0 )
00885         result = 0;
00886       else
00887         result = 1 - 2 * ( delta < 0 );
00888 
00889 #else
00890 
00891       FT_Int64  z1, z2;
00892 
00893 
00894       /* XXX: this function does not allow 64-bit arguments */
00895       ft_multo64( (FT_Int32)in_x, (FT_Int32)out_y, &z1 );
00896       ft_multo64( (FT_Int32)in_y, (FT_Int32)out_x, &z2 );
00897 
00898       if ( z1.hi > z2.hi )
00899         result = +1;
00900       else if ( z1.hi < z2.hi )
00901         result = -1;
00902       else if ( z1.lo > z2.lo )
00903         result = +1;
00904       else if ( z1.lo < z2.lo )
00905         result = -1;
00906       else
00907         result = 0;
00908 
00909 #endif
00910     }
00911 
00912     /* XXX: only the sign of return value, +1/0/-1 must be used */
00913     return (FT_Int)result;
00914   }
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