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[Git][freetype/freetype][master] [sdf, bsdf] Use shared FT_SqrtFixed.

From: Alexei Podtelezhnikov (@apodtele)
Subject: [Git][freetype/freetype][master] [sdf, bsdf] Use shared FT_SqrtFixed.
Date: Mon, 06 May 2024 13:39:08 +0000

Alexei Podtelezhnikov pushed to branch master at FreeType / FreeType

Commits:

  • d0e3239f
    by Alexei Podtelezhnikov (Алексей Подтележников) at 2024-05-06T13:39:06+00:00 
    [sdf, bsdf] Use shared FT_SqrtFixed.

FT_SqrtFixed (95b0fe2a6dff) is faster and does not overflow.

* src/sdf/ftsdfcommin.h (square_root): Replace with a macro.
* src/sdf/ftsdfcommin.c (square_root): Remove function.

2 changed files:

Changes:

  • src/sdf/ftsdfcommon.c
    ... ... @@ -22,49 +22,6 @@
    22 22 
     #include "ftsdfcommon.h"
    23 23
    24 24
    25 
    -  /**************************************************************************
    26 
    -   *
    27 
    -   * common functions
    28 
    -   *
    29 
    -   */
    30 
    -
    31 
    -  /*
    32 
    -   * Original algorithm:
    33 
    -   *
    34 
    -   *   https://github.com/chmike/fpsqrt
    35 
    -   *
    36 
    -   * Use this to compute the square root of a 16.16 fixed-point number.
    37 
    -   */
    38 
    -  FT_LOCAL_DEF( FT_16D16 )
    39 
    -  square_root( FT_16D16  val )
    40 
    -  {
    41 
    -    FT_ULong  t, q, b, r;
    42 
    -
    43 
    -
    44 
    -    r = (FT_ULong)val;
    45 
    -    b = 0x40000000L;
    46 
    -    q = 0;
    47 
    -
    48 
    -    while ( b > 0x40L )
    49 
    -    {
    50 
    -      t = q + b;
    51 
    -
    52 
    -      if ( r >= t )
    53 
    -      {
    54 
    -        r -= t;
    55 
    -        q  = t + b;
    56 
    -      }
    57 
    -
    58 
    -      r <<= 1;
    59 
    -      b >>= 1;
    60 
    -    }
    61 
    -
    62 
    -    q >>= 8;
    63 
    -
    64 
    -    return (FT_16D16)q;
    65 
    -  }
    66 
    -
    67 
    -
    68 25 
       /**************************************************************************
    69 26 
        *
    70 27 
        * format and sign manipulating functions

  • src/sdf/ftsdfcommon.h
    ... ... @@ -122,8 +122,7 @@ FT_BEGIN_HEADER
    122 122 
       typedef FT_BBox   FT_CBox;       /* control box of a curve            */
    123 123
    124 124
    125 
    -  FT_LOCAL( FT_16D16 )
    126 
    -  square_root( FT_16D16  val );
    125 
    +#define square_root( x )  (FT_16D16)FT_SqrtFixed( (FT_UInt32)( x ) )
    127 126
    128 127 
       FT_LOCAL( FT_SDFFormat )
    129 128 
       map_fixed_to_sdf( FT_16D16  dist,

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