www.pudn.com > freetype.rar > ftcalc.h

/***************************************************************************/ 
/*                                                                         */ 
/*  ftcalc.h                                                               */ 
/*                                                                         */ 
/*    Arithmetic computations (specification).                             */ 
/*                                                                         */ 
/*  Copyright 1996-2001, 2002 by                                           */ 
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */ 
/*                                                                         */ 
/*  This file is part of the FreeType project, and may only be used,       */ 
/*  modified, and distributed under the terms of the FreeType project      */ 
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */ 
/*  this file you indicate that you have read the license and              */ 
/*  understand and accept it fully.                                        */ 
/*                                                                         */ 
/***************************************************************************/ 
 
 
#ifndef __FTCALC_H__ 
#define __FTCALC_H__ 
 
 
#include "ft2build.h" 
#include "freetype/freetype.h" 
 
 
FT_BEGIN_HEADER 
 
 
  FT_EXPORT( FT_Int32 )  FT_SqrtFixed( FT_Int32  x ); 
 
 
#define SQRT_32( x )  FT_Sqrt32( x ) 
 
 
  /*************************************************************************/ 
  /*                                                                       */ 
  /*                                                             */ 
  /*    FT_Sqrt32                                                          */ 
  /*                                                                       */ 
  /*                                                          */ 
  /*    Computes the square root of an Int32 integer (which will be        */ 
  /*    handled as an unsigned long value).                                */ 
  /*                                                                       */ 
  /*                                                                */ 
  /*    x :: The value to compute the root for.                            */ 
  /*                                                                       */ 
  /*                                                               */ 
  /*    The result of `sqrt(x)'.                                           */ 
  /*                                                                       */ 
  FT_EXPORT( FT_Int32 ) 
  FT_Sqrt32( FT_Int32  x ); 
 
 
  /*************************************************************************/ 
  /*                                                                       */ 
  /* FT_MulDiv() and FT_MulFix() are declared in freetype.h.               */ 
  /*                                                                       */ 
  /*************************************************************************/ 
 
 
#define INT_TO_F26DOT6( x )    ( (FT_Long)(x) << 6  ) 
#define INT_TO_F2DOT14( x )    ( (FT_Long)(x) << 14 ) 
#define INT_TO_FIXED( x )      ( (FT_Long)(x) << 16 ) 
#define F2DOT14_TO_FIXED( x )  ( (FT_Long)(x) << 2  ) 
#define FLOAT_TO_FIXED( x )    ( (FT_Long)( x * 65536.0 ) ) 
 
#define ROUND_F26DOT6( x )     ( x >= 0 ? (    ( (x) + 32 ) & -64 )     \ 
                                        : ( -( ( 32 - (x) ) & -64 ) ) ) 
 
 
FT_END_HEADER 
 
#endif /* __FTCALC_H__ */ 
 
 
/* END */