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Improve comments, remove dead code.

This commit is contained in:
Werner Lemberg 2014-10-25 06:28:18 +02:00
parent fe15152ce7
commit d8632a842e
3 changed files with 31 additions and 126 deletions
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11
include/internal/ftcalc.h
View File

@ -363,11 +363,14 @@ FT_BEGIN_HEADER
/*
* Approximate sqrt(x*x+y*y) using alpha max plus beta min algorithm.
* Approximate sqrt(x*x+y*y) using the `alpha max plus beta min'
* algorithm. We use alpha = 1, beta = 3/8, giving us results with a
* largest error less than 7% compared to the exact value.
*/
#define FT_HYPOT( x, y ) \
( x = FT_ABS( x ), y = FT_ABS( y ), \
x > y ? x + ( 3 * y >> 3 ) \
#define FT_HYPOT( x, y ) \
( x = FT_ABS( x ), \
y = FT_ABS( y ), \
x > y ? x + ( 3 * y >> 3 ) \
: y + ( 3 * x >> 3 ) )

60
src/autofit/afangles.c
View File

@ -20,66 +20,6 @@
#include "aftypes.h"
#if 0
FT_LOCAL_DEF( FT_Int )
af_corner_is_flat( FT_Pos x_in,
FT_Pos y_in,
FT_Pos x_out,
FT_Pos y_out )
{
FT_Pos ax = x_in;
FT_Pos ay = y_in;
FT_Pos d_in, d_out, d_corner;
if ( ax < 0 )
ax = -ax;
if ( ay < 0 )
ay = -ay;
d_in = ax + ay;
ax = x_out;
if ( ax < 0 )
ax = -ax;
ay = y_out;
if ( ay < 0 )
ay = -ay;
d_out = ax + ay;
ax = x_out + x_in;
if ( ax < 0 )
ax = -ax;
ay = y_out + y_in;
if ( ay < 0 )
ay = -ay;
d_corner = ax + ay;
return ( d_in + d_out - d_corner ) < ( d_corner >> 4 );
}
FT_LOCAL_DEF( FT_Int )
af_corner_orientation( FT_Pos x_in,
FT_Pos y_in,
FT_Pos x_out,
FT_Pos y_out )
{
FT_Pos delta;
delta = x_in * y_out - y_in * x_out;
if ( delta == 0 )
return 0;
else
return 1 - 2 * ( delta < 0 );
}
#endif /* 0 */
/*
* We are not using `af_angle_atan' anymore, but we keep the source
* code below just in case...

86
src/base/ftcalc.c
View File

@ -858,78 +858,40 @@
FT_Pos out_x,
FT_Pos out_y )
{
#if 0
FT_Pos ax = in_x;
FT_Pos ay = in_y;
FT_Pos d_in, d_out, d_corner;
/* We approximate the Euclidean metric (sqrt(x^2 + y^2)) with */
/* the Taxicab metric (|x| + |y|), which can be computed much */
/* faster. If one of the two vectors is much longer than the */
/* other one, the direction of the shorter vector doesn't */
/* influence the result any more. */
/* */
/* corner */
/* x---------------------------x */
/* \ / */
/* \ / */
/* in \ / out */
/* \ / */
/* o */
/* Point */
/* */
if ( ax < 0 )
ax = -ax;
if ( ay < 0 )
ay = -ay;
d_in = ax + ay; /* d_in = || in || */
ax = out_x;
if ( ax < 0 )
ax = -ax;
ay = out_y;
if ( ay < 0 )
ay = -ay;
d_out = ax + ay; /* d_out = || out || */
ax = out_x + in_x;
if ( ax < 0 )
ax = -ax;
ay = out_y + in_y;
if ( ay < 0 )
ay = -ay;
d_corner = ax + ay; /* d_corner = || in + out || */
#else
FT_Pos ax = in_x + out_x;
FT_Pos ay = in_y + out_y;
FT_Pos d_in, d_out, d_corner;
FT_Pos d_in, d_out, d_hypot;
/* The original implementation always returned TRUE */
/* for vectors from the same quadrant dues to additivity */
/* of Taxicab metric there. The alpha max plus beta min */
/* algorithm used here is additive within each octant, */
/* so we now reject some near 90-degree corners within */
/* quadrants, consistently with eliptic definition of */
/* flat corner. */
d_in = FT_HYPOT( in_x, in_y );
d_out = FT_HYPOT( out_x, out_y );
d_corner = FT_HYPOT( ax, ay );
/* The idea of this function is to compare the length of the */
/* hypotenuse with the `in' and `out' length. The `corner' */
/* represented by `in' and `out' is flat if the hypotenuse's */
/* length isn't too large. */
/* */
/* This approach has the advantage that the angle between */
/* `in' and `out' is not checked. In case one of the two */
/* vectors is `dominant', this is, much larger than the */
/* other vector, we thus always have a flat corner. */
/* */
/* hypotenuse */
/* x---------------------------x */
/* \ / */
/* \ / */
/* in \ / out */
/* \ / */
/* o */
/* Point */
#endif
d_in = FT_HYPOT( in_x, in_y );
d_out = FT_HYPOT( out_x, out_y );
d_hypot = FT_HYPOT( ax, ay );
/* now do a simple length comparison: */
/* */
/* d_in + d_out < 17/16 d_corner */
/* d_in + d_out < 17/16 d_hypot */
return ( d_in + d_out - d_corner ) < ( d_corner >> 4 );
return ( d_in + d_out - d_hypot ) < ( d_hypot >> 4 );
}