lib/freetype/include/freetype/internal/ftcalc.h

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftcalc.h                                                               */
   4 /*                                                                         */
   5 /*    Arithmetic computations (specification).                             */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001, 2002 by                                           */
   8 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
   9 /*                                                                         */
  10 /*  This file is part of the FreeType project, and may only be used,       */
  11 /*  modified, and distributed under the terms of the FreeType project      */
  12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13 /*  this file you indicate that you have read the license and              */
  14 /*  understand and accept it fully.                                        */
  15 /*                                                                         */
  16 /***************************************************************************/
  17
  18
  19 #ifndef __FTCALC_H__
  20 #define __FTCALC_H__
  21
  22
  23 #include <ft2build.h>
  24 #include FT_FREETYPE_H
  25
  26
  27 FT_BEGIN_HEADER
  28
  29
  30   FT_EXPORT( FT_Int32 )  FT_SqrtFixed( FT_Int32  x );
  31
  32
  33 #define SQRT_32( x )  FT_Sqrt32( x )
  34
  35
  36   /*************************************************************************/
  37   /*                                                                       */
  38   /* <Function>                                                            */
  39   /*    FT_Sqrt32                                                          */
  40   /*                                                                       */
  41   /* <Description>                                                         */
  42   /*    Computes the square root of an Int32 integer (which will be        */
  43   /*    handled as an unsigned long value).                                */
  44   /*                                                                       */
  45   /* <Input>                                                               */
  46   /*    x :: The value to compute the root for.                            */
  47   /*                                                                       */
  48   /* <Return>                                                              */
  49   /*    The result of `sqrt(x)'.                                           */
  50   /*                                                                       */
  51   FT_EXPORT( FT_Int32 )
  52   FT_Sqrt32( FT_Int32  x );
  53
  54
  55   /*************************************************************************/
  56   /*                                                                       */
  57   /* FT_MulDiv() and FT_MulFix() are declared in freetype.h.               */
  58   /*                                                                       */
  59   /*************************************************************************/
  60
  61
  62 #define INT_TO_F26DOT6( x )    ( (FT_Long)(x) << 6  )
  63 #define INT_TO_F2DOT14( x )    ( (FT_Long)(x) << 14 )
  64 #define INT_TO_FIXED( x )      ( (FT_Long)(x) << 16 )
  65 #define F2DOT14_TO_FIXED( x )  ( (FT_Long)(x) << 2  )
  66 #define FLOAT_TO_FIXED( x )    ( (FT_Long)( x * 65536.0 ) )
  67
  68 #define ROUND_F26DOT6( x )     ( x >= 0 ? (    ( (x) + 32 ) & -64 )     \
  69                                         : ( -( ( 32 - (x) ) & -64 ) ) )
  70
  71
  72 FT_END_HEADER
  73
  74 #endif /* __FTCALC_H__ */
  75
  76
  77 /* END */