misc/libfreetype/src/autofit/afangles.c
author unc0rr
Wed, 05 Dec 2012 23:51:04 +0400
branchflibqtfrontend
changeset 8230 bd4b8f9488a4
parent 5172 88f2e05288ba
permissions -rw-r--r--
Show who's in game to spectators
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/***************************************************************************/
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/*                                                                         */
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/*  afangles.c                                                             */
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/*                                                                         */
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/*    Routines used to compute vector angles with limited accuracy         */
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/*    and very high speed.  It also contains sorting routines (body).      */
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/*                                                                         */
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/*  Copyright 2003-2006, 2011 by                                           */
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/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
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/*                                                                         */
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/*  This file is part of the FreeType project, and may only be used,       */
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/*  modified, and distributed under the terms of the FreeType project      */
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/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
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/*  this file you indicate that you have read the license and              */
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/*  understand and accept it fully.                                        */
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/*                                                                         */
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/***************************************************************************/
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#include "aftypes.h"
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#if 0
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  FT_LOCAL_DEF( FT_Int )
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  af_corner_is_flat( FT_Pos  x_in,
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                     FT_Pos  y_in,
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                     FT_Pos  x_out,
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                     FT_Pos  y_out )
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  {
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    FT_Pos  ax = x_in;
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    FT_Pos  ay = y_in;
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    FT_Pos  d_in, d_out, d_corner;
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    if ( ax < 0 )
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      ax = -ax;
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    if ( ay < 0 )
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      ay = -ay;
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    d_in = ax + ay;
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    ax = x_out;
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    if ( ax < 0 )
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      ax = -ax;
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    ay = y_out;
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    if ( ay < 0 )
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      ay = -ay;
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    d_out = ax + ay;
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    ax = x_out + x_in;
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    if ( ax < 0 )
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      ax = -ax;
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    ay = y_out + y_in;
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    if ( ay < 0 )
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      ay = -ay;
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    d_corner = ax + ay;
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    return ( d_in + d_out - d_corner ) < ( d_corner >> 4 );
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  }
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  FT_LOCAL_DEF( FT_Int )
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  af_corner_orientation( FT_Pos  x_in,
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                         FT_Pos  y_in,
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                         FT_Pos  x_out,
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                         FT_Pos  y_out )
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  {
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    FT_Pos  delta;
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    delta = x_in * y_out - y_in * x_out;
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    if ( delta == 0 )
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      return 0;
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    else
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      return 1 - 2 * ( delta < 0 );
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  }
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#endif /* 0 */
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  /*
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   *  We are not using `af_angle_atan' anymore, but we keep the source
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   *  code below just in case...
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   */
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#if 0
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  /*
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   *  The trick here is to realize that we don't need a very accurate angle
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   *  approximation.  We are going to use the result of `af_angle_atan' to
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   *  only compare the sign of angle differences, or check whether its
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   *  magnitude is very small.
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   *
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   *  The approximation
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   *
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   *    dy * PI / (|dx|+|dy|)
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   *
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   *  should be enough, and much faster to compute.
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   */
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  FT_LOCAL_DEF( AF_Angle )
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  af_angle_atan( FT_Fixed  dx,
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                 FT_Fixed  dy )
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  {
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    AF_Angle  angle;
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    FT_Fixed  ax = dx;
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    FT_Fixed  ay = dy;
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    if ( ax < 0 )
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      ax = -ax;
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    if ( ay < 0 )
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      ay = -ay;
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    ax += ay;
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    if ( ax == 0 )
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      angle = 0;
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    else
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    {
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      angle = ( AF_ANGLE_PI2 * dy ) / ( ax + ay );
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      if ( dx < 0 )
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      {
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        if ( angle >= 0 )
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          angle = AF_ANGLE_PI - angle;
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        else
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          angle = -AF_ANGLE_PI - angle;
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      }
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    }
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    return angle;
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  }
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#elif 0
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  /* the following table has been automatically generated with */
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  /* the `mather.py' Python script                             */
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#define AF_ATAN_BITS  8
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  static const FT_Byte  af_arctan[1L << AF_ATAN_BITS] =
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  {
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     0,  0,  1,  1,  1,  2,  2,  2,
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     3,  3,  3,  3,  4,  4,  4,  5,
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     5,  5,  6,  6,  6,  7,  7,  7,
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     8,  8,  8,  9,  9,  9, 10, 10,
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    10, 10, 11, 11, 11, 12, 12, 12,
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    13, 13, 13, 14, 14, 14, 14, 15,
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    15, 15, 16, 16, 16, 17, 17, 17,
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    18, 18, 18, 18, 19, 19, 19, 20,
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    20, 20, 21, 21, 21, 21, 22, 22,
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    22, 23, 23, 23, 24, 24, 24, 24,
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    25, 25, 25, 26, 26, 26, 26, 27,
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    27, 27, 28, 28, 28, 28, 29, 29,
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    29, 30, 30, 30, 30, 31, 31, 31,
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    31, 32, 32, 32, 33, 33, 33, 33,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   162
    34, 34, 34, 34, 35, 35, 35, 35,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   163
    36, 36, 36, 36, 37, 37, 37, 38,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   164
    38, 38, 38, 39, 39, 39, 39, 40,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   165
    40, 40, 40, 41, 41, 41, 41, 42,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   166
    42, 42, 42, 42, 43, 43, 43, 43,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   167
    44, 44, 44, 44, 45, 45, 45, 45,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   168
    46, 46, 46, 46, 46, 47, 47, 47,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   169
    47, 48, 48, 48, 48, 48, 49, 49,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   170
    49, 49, 50, 50, 50, 50, 50, 51,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   171
    51, 51, 51, 51, 52, 52, 52, 52,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   172
    52, 53, 53, 53, 53, 53, 54, 54,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   173
    54, 54, 54, 55, 55, 55, 55, 55,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   174
    56, 56, 56, 56, 56, 57, 57, 57,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   175
    57, 57, 57, 58, 58, 58, 58, 58,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   176
    59, 59, 59, 59, 59, 59, 60, 60,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   177
    60, 60, 60, 61, 61, 61, 61, 61,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   178
    61, 62, 62, 62, 62, 62, 62, 63,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   179
    63, 63, 63, 63, 63, 64, 64, 64
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   180
  };
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   181
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   182
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   183
  FT_LOCAL_DEF( AF_Angle )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   184
  af_angle_atan( FT_Fixed  dx,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
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   185
                 FT_Fixed  dy )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   186
  {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
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   187
    AF_Angle  angle;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   188
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   189
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   190
    /* check trivial cases */
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   191
    if ( dy == 0 )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   192
    {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   193
      angle = 0;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   194
      if ( dx < 0 )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   195
        angle = AF_ANGLE_PI;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   196
      return angle;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   197
    }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   198
    else if ( dx == 0 )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   199
    {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   200
      angle = AF_ANGLE_PI2;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
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   201
      if ( dy < 0 )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   202
        angle = -AF_ANGLE_PI2;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   203
      return angle;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   204
    }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   205
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   206
    angle = 0;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   207
    if ( dx < 0 )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   208
    {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   209
      dx = -dx;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   210
      dy = -dy;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   211
      angle = AF_ANGLE_PI;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   212
    }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   213
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   214
    if ( dy < 0 )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   215
    {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   216
      FT_Pos  tmp;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   217
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   218
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   219
      tmp = dx;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   220
      dx  = -dy;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   221
      dy  = tmp;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   222
      angle -= AF_ANGLE_PI2;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   223
    }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   224
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   225
    if ( dx == 0 && dy == 0 )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   226
      return 0;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   227
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   228
    if ( dx == dy )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   229
      angle += AF_ANGLE_PI4;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   230
    else if ( dx > dy )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   231
      angle += af_arctan[FT_DivFix( dy, dx ) >> ( 16 - AF_ATAN_BITS )];
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   232
    else
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   233
      angle += AF_ANGLE_PI2 -
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   234
               af_arctan[FT_DivFix( dx, dy ) >> ( 16 - AF_ATAN_BITS )];
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   235
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   236
    if ( angle > AF_ANGLE_PI )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   237
      angle -= AF_ANGLE_2PI;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   238
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   239
    return angle;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   240
  }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   241
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   242
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   243
#endif /* 0 */
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   244
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   245
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   246
  FT_LOCAL_DEF( void )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   247
  af_sort_pos( FT_UInt  count,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   248
               FT_Pos*  table )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   249
  {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   250
    FT_UInt  i, j;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   251
    FT_Pos   swap;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   252
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   253
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   254
    for ( i = 1; i < count; i++ )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   255
    {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   256
      for ( j = i; j > 0; j-- )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   257
      {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   258
        if ( table[j] > table[j - 1] )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   259
          break;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   260
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   261
        swap         = table[j];
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   262
        table[j]     = table[j - 1];
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   263
        table[j - 1] = swap;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   264
      }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   265
    }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   266
  }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   267
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   268
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   269
  FT_LOCAL_DEF( void )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   270
  af_sort_widths( FT_UInt   count,
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   271
                  AF_Width  table )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   272
  {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   273
    FT_UInt      i, j;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   274
    AF_WidthRec  swap;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   275
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   276
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   277
    for ( i = 1; i < count; i++ )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   278
    {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   279
      for ( j = i; j > 0; j-- )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   280
      {
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   281
        if ( table[j].org > table[j - 1].org )
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   282
          break;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   283
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   284
        swap         = table[j];
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   285
        table[j]     = table[j - 1];
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   286
        table[j - 1] = swap;
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   287
      }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   288
    }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   289
  }
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   290
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   291
88f2e05288ba aaand let's add freetype as well while we are at it
koda
parents:
diff changeset
   292
/* END */