kc3-lang/freetype/include/internal/ftcalc.h

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• Hash : fae38207
  Author :
  Date : 2013-11-13T08:55:46
  

  Simplify header file hierarchy.
  
  This large patch changes the header file directory layout from
  `include/freetype/...' to `include/...', effectively removing one
  level.  Since the file `ft2build.h' is also located in `include'
  (and it stays there even after installation), all FreeType header
  files are now in a single directory.
  
  Applications that use (a) `freetype-config' or FreeType's
  `pkg-config' file to get the include directory for the compiler, and
  (b) the documented way for header inclusion like
  
    #include <ft2build.h>
    #include FT_FREETYPE_H
    ...
  
  don't need any change to the source code.
  
  * include/freetype/*: Move up to...
  * include/*: ... this directory.
  
  * builds/amiga/include/freetype/*: Move up to...
  * builds/amiga/include/*: ... this directory.
  
  */*: Essentially do `s@/freetype/@/@' where appropriate.
  
  * CMakeList.txt: Simplify.
  * builds/unix/freetype-config.in, builds/unix/freetype2.in: For
  `--cflags', return a single directory.
  * builds/unix/install.mk (install): No longer try to remove `cache'
  and `internal' subdirectories; instead, remove the `freetype'
  subdirectory.
  

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• include/internal/ftcalc.h

• /***************************************************************************/
  /*                                                                         */
  /*  ftcalc.h                                                               */
  /*                                                                         */
  /*    Arithmetic computations (specification).                             */
  /*                                                                         */
  /*  Copyright 1996-2006, 2008, 2009, 2012-2013 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 FT_FREETYPE_H
  
  
  FT_BEGIN_HEADER
  
  
  #if 0
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_SqrtFixed                                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Computes the square root of a 16.16 fixed-point value.             */
    /*                                                                       */
    /* <Input>                                                               */
    /*    x :: The value to compute the root for.                            */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The result of `sqrt(x)'.                                           */
    /*                                                                       */
    /* <Note>                                                                */
    /*    This function is not very fast.                                    */
    /*                                                                       */
    FT_BASE( FT_Int32 )
    FT_SqrtFixed( FT_Int32  x );
  
  #endif /* 0 */
  
  
    /*************************************************************************/
    /*                                                                       */
    /* FT_MulDiv() and FT_MulFix() are declared in freetype.h.               */
    /*                                                                       */
    /*************************************************************************/
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    FT_MulDiv_No_Round                                                 */
    /*                                                                       */
    /* <Description>                                                         */
    /*    A very simple function used to perform the computation `(a*b)/c'   */
    /*    (without rounding) with maximum accuracy (it uses a 64-bit         */
    /*    intermediate integer whenever necessary).                          */
    /*                                                                       */
    /*    This function isn't necessarily as fast as some processor specific */
    /*    operations, but is at least completely portable.                   */
    /*                                                                       */
    /* <Input>                                                               */
    /*    a :: The first multiplier.                                         */
    /*    b :: The second multiplier.                                        */
    /*    c :: The divisor.                                                  */
    /*                                                                       */
    /* <Return>                                                              */
    /*    The result of `(a*b)/c'.  This function never traps when trying to */
    /*    divide by zero; it simply returns `MaxInt' or `MinInt' depending   */
    /*    on the signs of `a' and `b'.                                       */
    /*                                                                       */
    FT_BASE( FT_Long )
    FT_MulDiv_No_Round( FT_Long  a,
                        FT_Long  b,
                        FT_Long  c );
  
  
    /*
     *  A variant of FT_Matrix_Multiply which scales its result afterwards.
     *  The idea is that both `a' and `b' are scaled by factors of 10 so that
     *  the values are as precise as possible to get a correct result during
     *  the 64bit multiplication.  Let `sa' and `sb' be the scaling factors of
     *  `a' and `b', respectively, then the scaling factor of the result is
     *  `sa*sb'.
     */
    FT_BASE( void )
    FT_Matrix_Multiply_Scaled( const FT_Matrix*  a,
                               FT_Matrix        *b,
                               FT_Long           scaling );
  
  
    /*
     *  A variant of FT_Vector_Transform.  See comments for
     *  FT_Matrix_Multiply_Scaled.
     */
    FT_BASE( void )
    FT_Vector_Transform_Scaled( FT_Vector*        vector,
                                const FT_Matrix*  matrix,
                                FT_Long           scaling );
  
  
    /*
     *  Return -1, 0, or +1, depending on the orientation of a given corner.
     *  We use the Cartesian coordinate system, with positive vertical values
     *  going upwards.  The function returns +1 if the corner turns to the
     *  left, -1 to the right, and 0 for undecidable cases.
     */
    FT_BASE( FT_Int )
    ft_corner_orientation( FT_Pos  in_x,
                           FT_Pos  in_y,
                           FT_Pos  out_x,
                           FT_Pos  out_y );
  
    /*
     *  Return TRUE if a corner is flat or nearly flat.  This is equivalent to
     *  saying that the angle difference between the `in' and `out' vectors is
     *  very small.
     */
    FT_BASE( FT_Int )
    ft_corner_is_flat( FT_Pos  in_x,
                       FT_Pos  in_y,
                       FT_Pos  out_x,
                       FT_Pos  out_y );
  
  
    /*
     *  Return the most significant bit index.
     */
    FT_BASE( FT_Int )
    FT_MSB( FT_UInt32  z );
  
  
    /*
     *  Return sqrt(x*x+y*y), which is the same as `FT_Vector_Length' but uses
     *  two fixed-point arguments instead.
     */
    FT_BASE( FT_Fixed )
    FT_Hypot( FT_Fixed  x,
              FT_Fixed  y );
  
  
  #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 FIXED_TO_INT( x )      ( FT_RoundFix( x ) >> 16 )
  
  #define ROUND_F26DOT6( x )     ( x >= 0 ? (    ( (x) + 32 ) & -64 )     \
                                          : ( -( ( 32 - (x) ) & -64 ) ) )
  
  
  FT_END_HEADER
  
  #endif /* __FTCALC_H__ */
  
  
  /* END */
  

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